1. Introduction

The cloud computing involves the provision of on-demand computing services to the customers. These services are similar to the usual services that can be obtained by using the physical computing equipment such as storage devices, servers, networking and many more. As the realization of the benefits of cloud computing come to light, many businesses, companies, organizations, and in stitutions are switching to the cloud services. Cloud services are provided by the cloud service providers (CSP) who are responsible for manning all the infrastructures, software, and the platforms to which the customers subscribe. Performance remains a significant concern for the consumers who are still struggling with the decision of moving to the cloud. Though there are many significant standards in cloud computing, the primary standard is on the data migration performance from the non-cloud infrastructure to the cloud. This paper is an extension of the work which was initially published and presented in IEEE 20th International Conference on High-Performance Computing and Communications [1].

Typically, a multiprocessor includes a variety of computational units, a memory, a control, and at least one I/O processor. The functions of a job are initiated and processed, sometimes being moved from one computational unit to another. In the course of such operations, tasks must be synchronized and, in this regard, a function may require data from another function supplied through the I/O processor [2]. Under such circumstances, there is an issue in increasing number of processors against problem size.

 The features of parallelism have been known since Babbage’s effort to construct a mechanistic computer [3]. Industrial and academic researchers have studied every imaginable aspect of parallel computation. A system becomes slower due to combined cumbersome computation processes, therefore, there is a need of using parallel computing to improve and provide high levels of execution performance efficiency. Moreover, this research also provides the design and validation of the analytic performance of the parallel migration to enhance the speed of the system.

Related studies in the fields of data migration via parallelism have gained focus over the past few years. However, most of the proposed studies only get the standpoint of either a cloud provider or cloud consumers, not both. In the present work, the proposed scheme shall concentrate on allowing the cloud provider and also the consumer to accomplish data migration efficiently by exploiting potential improvements found in consumer PC multicore chips. Moreover, future cloud storage environments will be primarily designed and built on top of multicore technology.

In this paper, we propose a parallel migration system that can be made cost‐optimal by adjusting the number of processors and the problem size. The parallel migration is achieved by dynamic distribution for the combination of file slicing, cryptography, fault tolerance, and hashing.

The remaining paper is structured in a manner that section 2 presents the related works in this field. Section 3 defines and models how the proposed system achieves parallel migration by dynamic distribution. Section 4 shows the experimental outcome and section 5 concludes the paper with some future remarks.

2. Related Works

In this section, we discuss some of the approaches related to the data migration parallelism as well as increasing file transfer bandwidth.

HTTP, SFTP, and SCP are the standard data migration communication protocols for point-to-point transfer. In terms of elasticity, the improvement is based on the work of [4] that helps to scale down the repetitive data migration through developing “checksum comparison” and the work presented in [5] prevents resource conflict by distinguishing “back-pressure”. However, still, these approaches have thus far to capitalize on cloud elasticity. In our method, we aim at matching the amount of resources allocated to data transfer in parallel mode with the amount of resources it actually requires, avoiding over-provisioning or under-provisioning.

In terms of connection speed, the existing odd source to odd end target data migration speed is usually limited by either cloud provider settings or limits set by the hardware of physical connection. Though, one of the solutions to prevent these restrictions and to expand data migration throughput is to perform data migration from multiple servers concurrently. Even though, BTorrent [6] illustrates that this is rational but processing this data involvement procedure (As It Is) is far from appropriate “for a one-time point-to-point” migration. However, our parallelization data migration combines data segmentation and erasure code, AES, and hash with developing parallel migration capacity and minimizing data transfer delay.

Multiple data transmission develops the processor’s total bandwidth; however, it is limited because the “bottleneck” lies in the specific cloud processor’s bandwidth. One more comparable system is the parallel transfer where files are prearranged through several input/output processors to minimize storage bottleneck, which allows transmission across several TCP connections concurrently. Another similar system can be applied in cloud storage, but the overheads to rearranged files across numerous storages should to be considered in order to improve the file transmission performance. In our parallelization model, provisional buffer is created on the cloud machine, and these buffers are indicted to as the ‘holes’. As the buffer hole is fully occupied, it is then taken away from the list. The entries of theses buffer-holes are then tested with the descriptor-list to confirm if the buffer-hole which has been loaded by the arriving segment is rejected [1].

In [7], multi-hop and multi-path which are two optimization techniques to increase the performance of file transmission across WAN are briefly discovered. In multi-hop path splitting, throughput was improved by exchanging direct connection between start and end point via multi-hopping. On other hand, multi-path technique includes slicing data at the start point and sending it through various overlapping paths. Chunking and rebuilding data theoretically cause data corruption, damage or failure. Thus, our proposed model takes into consideration fault-protection by applying several Reed-Solomon (RS) code values along with the data sizes to supplementary explore the impact of different values.

The authors in [8] propose a cloud-based data management system targeted for big data science applications running across large and high geographical environment sites which shows expectable data transfer management performance in terms of cost and time. The system automatically implements and adjusts performance designs for the cloud platform structure for enhancing data and efficient schedule of the transfer process. Though, it shows a poor execution performance when compared with our proposed parallelization model.

Another similar approach [9] is the parallel data transfer where data are lined across several intermediate nodes that are spawned in order to avoid the bandwidth limitation, but the overheads to reallocated data across multiple nodes in source DC and destination DC have to be taken into attention for performance improvement on the file transfer.

3. Server to Cloud Parallel Data Transfer Modelling

3.1.  General Concept of the Model

In this section, we define the outline of our server-to-cloud parallel transfer conception and formulate an arithmetic model constructed on the proposed parallel migration concept. In the rest of the paper, we then cover the server-to-cloud parallel migration task as parallel data transfer.

Figure 1 represents the construction overview of our parallel migration model. The process starts with the data as the input, the data is then segmented into chunks, every segmented data is encrypted. Encrypted chunks are migrated to the cloud and then decrypted. The decrypted chunks are then compared against the un-encrypted segments on the local server. If they don’t match, the process is taken back to the segmentation stage. If they match, the segments are then re-assembled and saved on the cloud server. We then end the process.

The following is the arrangement of status for a single file transmission from server to cloud storage.

Figure 1: Overview of parallel transfer mechanism

• Data Segmentation [10]: Data segmentations split-up the bigger data units into smaller controllable data slices. In our data segmentation, we will be using an algorithm that will take the shortest time possible to segment larger volumes of data packets, while optimizing the memory efficiency of the working machines. In this algorithm, the system scans the data packets to find the size of the whole data to be segmented. The total data size is then used as a base for the determination of how many segments should be generated from the original data. Data size levels are then predefined to allow the categorization how a given data set belonging to a given size group is segmented. The categorizing of data based on the whole data size ensures that we have larger data size, the right segmentation size will be obtained in order to make the process faster. The data will then be split into smaller equal sized chunks of 4MB each. The chunks are assigned a sequence number each, according to the order in which they are segmented. If we have a larger volume of data, then more instances of segmentations will be initiated to make sure that less time is taken to process the whole data. The number of segmentation instances is dictated by the size of whole data.
• Error control: The end-to-end transmission of data from the server to the destination storage encompasses many steps which can be subjected to errors leading to data loss. Error control ensures that any error that occurs during the transmission of the data is detected and addressed. Reliable data transmission implements error detection and correction. Error correction enables a system to detect and correct both the bit-level and packet-level errors. There are two types of errors that can occur during the data transmission: single-bit error, in which only one-bit changes from 0 to 1 and vice versa and burst error where two or more bits change from 0 to 1 and vice versa. Burst-error is known as the packet-level error which results in duplication or re-ordering of the data. We are using the checksum method for error control which is applied at the upper-layer, and it uses the concept of redundancy. There are two operations which are being performed in checksum technique: Checksum-generator on the server side and Checksum-checker on the cloud side while the local server makes use of the checksum-generator. The following is the procedure for the checksum generation:
• The data segments are sub-segmented into equal n-bits.
• This is followed by adding together the sub-segments with the usage of 1’s compliment.
• The data segment is re-complimented to become a checksum.
• It is then sent alongside the data-unit.
• Encryption: The system uses an Advanced Encryption System (AES) with the RSA key-exchange. The symmetric encryption technique requires a proper key exchange to maintain the security of communication and minimize the risk of eavesdropping during the key exchange phase. RSA-2048 is then used for key exchange. The main reason for not choosing RSA for encryption is that it needs more processing power and is slower than the mighty AES.
• Hash generation: Hash functions are one-way which means that it is impossible to revert from the generated values to the initial values. The hash function is used in our system to enhance the confidentiality of the data (message). We are using the secure hashing algorithm (SHA) which was modeled after MD4 and its proposal was made by NIST to offer a more secure hash standard (SHS). This will produce a 160 bits hash value.
• Three-way handshake initialization: Three-way handshake is a flow control technique which allows the communicating devices to initiate the communication platform. In Figure 2, the local server will initiate the three-way handshake by sending the cloud server a SYN (synchronization) message. This is a way of asking the cloud server if it is ready to communicate. The recipient, which is the cloud server sends back a SYN/ACK message to the local server telling it that it is ready for the communication. The local server then sends an ACK (Acknowledgement), and the connection between the two sides is established. The data is then transmitted.

Figure 2: Three-way handshake initialization.

• Hash verification: Hash checks for the integrity of the message. The cloud server receives a segment and runs SHA algorithm over it, if it matches, then we increment the number of received healthy segments by one, we ignore (discard) the rest of the segments which do not match. The system waits until receiving other segments (we know the total number of segments sender is going to send for us) and see how many of them are healthy (their integrity can be verified).
• Decryption: With the Cipher Block Chaining decryption, application of the inverse-cipher function to the first cipher-text block results into an output-block which passes through the XOR operation with the initialization-vector to allow the recovery of the first plaintext block. The inverse-cipher function is also applicable to the second cipher-text block which provides the output-block which is then XORed with the first cipher-text block for the recovery of the second plaintext block. Generally, the recovery of any plaintext block (except the first plain-text), the inverse cipher-function applies to the corresponding cipher-text block, and the output-block is XORed with the prior cipher-text block.
• Error correction: Error correction allows the cloud server which receives the data to reconstruct the original data in the event that it was corrupted during transmission. Error correction is implemented using the hamming code. Hamming code is a single-bit error correction method that uses the redundant bits. The redundant bits are included on the original data and their arrangement is in such a way that any different and incorrect bits will lead to the production of various error results. The corrupted bits are then identified and upon the identification of the corrupted bits, the cloud server which receives the data is capable of reversing its values hence, correcting the errors. Hamming code applies to any data length and makes use of the relationship between the data and the redundancy-bits. Checksum-checker: The cloud server makes use of the checksum-checker. The following is the procedure for the checksum checker:
• The cloud server which receives the data-unit will divide the received data-unit into equal sub-segments.
• All the sub-segments are then added together using the 1’s compliment.
• The outcome is complimented again. If the final result is found to be zero, the system accepts the data while when it is found to be 1, the data should be rejected and considered to have errors.
• Reassembling of data [11]: After all the data segments have arrived and each segment is verified, an algorithm to arrange the segments in order according to their sequence numbers will be used. This ensures that the data segments will be ordered back to their original state before being segmented on the local server [12]. In Figure 3, the flowchart diagram shows how the model receives the segment and allocates the buffer space for each segment. There are more segments in the buffer, by comparing the size of the segment with the size of the space available in the buffer, the segment is taken back. If there are no more data in the buffer, then the data unit is identified, and the data unit is bound to the context. It will then check if it is occupied by a different data unit. The bound data is then updated, and the segment is inserted into the data unit. The number of segments is then checked, if there are any remaining segments, they will return back to step one. If there are no remaining segments, then the header will be updated and the data unit will be transmitted. The numbering sequence plays a crucial role as it is the sequence number used to arrange back the data to its original state [13]. The size of the unencrypted segments on the source server is furthermore tested and matched with the size of the corresponding decrypted segments on the destination server. Re-assembling of data segments will only take place after all the previous stages have been successfully completed.

Figure 3:Reassembling of segments.

3.2.  Parallel Transfer Algorithm

Server user may perhaps definitely benefit from the rapid growth of multicore systems. The physical server typically holds several regular data centers or computer storage, where commodity high-performance multicore bunches are employed. Our migration algorithm designed for one direction data flow which begins at the server storage and ends at the cloud storage. Algorithm 1 shows the parallel-serial transmission which starts from a master processor acting as a management system. The aim of the master processor is to reach the final output by collecting the necessary information from the slave processors. In our migration algorithm, we will assume that the data is ready for transfer after the four stages: data chunks, error control/correction, encryption/ decryption with AES-256 and SHA-256 algorithm which is identified as the significant component of the integrity process. The transfer process will start by taking the ready data list, FList, and divides it between the slave processors. Correspondingly, each slave processor would obtain blocks of FList. We use single program multiple data (SPMD) algorithm where there is a single instruction that each processor performs, but on various data. Each slave processor would establish its secure channel, port, and buffer. Each slave processor will then send its Flist to the cloud buffer before the storage stage. The final task of the slave processor is to update its Flist by removing the sent chunks from the list. This procedure would reflect to have a higher bandwidth transmission capacity. Finally, the master processor receives the FList from all the slave processors and takes the re-transmission decision. If the Flist size=0, it means that all the data chunks have been sent successfully. However, if Flist size=!0, it means that the master processor will request for the re-transmission of the missing chunks by the method explained in [1]. The master processor would close the connection after all the re-transmission requests. At this phase, the cloud buffer is full of the data that need to be checked for integrity, verified and re-build to be stored.

3.3.  Time Factor of Parallel Transfer

The performance of the proposed model will be evaluated by computing the average of execution time, the number of processors, and the speedup ratio.

3.3.1                 Data Distribution Time (Segmentation+ CRS+ AES + HashGen)

Divided into four actions, file chunking, encoding, encryption, and hash generation. In order to minimize the delay between individual execution time, transferring has to be started directly after the segmentation when the exact chunk is ready, without waiting for the overall segments process to be completed. Server execution time can also be minimized by manipulating the chunk size and sequence when the network resource is unutilized.

3.3.2                 Parallel Data Migration Time

This time factor indicates the transfer from local server to buffers in the cloud storage. In order to increase the throughput of this phase, the parallelism method can be applied only if the transmission files are of a large number. Processor 0 would act as the root and starts to define the number of the chunks and divide them among the slave processors. As a result, each slave processor would collect a block of chunks. Later, they would establish their connections and send their chunk lists to the cloud buffers. The control would then be passed to TCP in order to finalize the transmission task.

3.3.3                 Data Amalgamation Time (HashVerify +AES +CRS +Re-Assembling)

In this time factor, the file reassembling is the prime task. It also involves the migration from the cloud buffers to the destination storages. This step also contains massive disk operations such as the writing process.

3.4.  Model and Evaluation of Parallel Migration

The parallel performance was analyzed by displaying speedup rate and throughput to illustrate the parallel model profit. The speedup of parallel operations on P processors is defined as the following [14]:

Where T₁ is the sequential execution time using one processor, T_P is the parallel execution time using P processors, p and 1 are indexes as written in equation 1. While Sequential Transfer Time equation (T₁) is:

Where  is data size in MB,  is transfer speed in MB/s. Parallel Transfer Time (  ) = data distribution time in the server + transfer time + data amalgamation time in the cloud. Hence, the speedup rate is acquired as below:

Figure 4: Speedup model for parallel transfer, where p is the number of processors.

It can be noticed that the smaller file transfer size (not many of small and large files together), a minimum number of parallel processors are required to accomplish a speedup. However, when trying to parallelize the transfer, there is no prediction of when the packet loss rate would begin to increase exponentially which causes a critical overhead. Thus, smaller file sizes do not benefit from the parallelization. Therefore, Figure 4 shows that the speedup rate is steep for the file size of below 4MB.

For a larger data transfer size, the speedup rate grows as the number of parallel processors are increased. However, performance gains are hardly worth when each subsequent increase in processors number brings a lesser performance profit contrasted to the previous increment.

4. Experimental Evaluation

This section shows the performance evaluation for our parallel migration system on an Infrastructure as a Service (IaaS) cloud environment.

4.1.  Experiment Setup

We carry out these experiments on two separate VMs (VM hardware were identical) hosted on Cray XC40 within two locations: Oregon and Amsterdam. Linux Operating System in various cores with 8 GB of memory was assembled on the VMs. All the encryption /decryption stages are constructed with the help of python cryptography 2.1.4.

Our experiment concentrates on migrating a single file from the server to cloud storage. The model is designed in such a way that each part of the system is pluggable. Thus, replacing an encryption algorithm will not affect the selection of the coding algorithm. We have chosen numerous file sizes, starting from .05 MB to 1900MB and RS parameters (k, m) in range of (1 ≤ m ≤ k and k ≤ 256, where m=parity) in order to evaluate the transfer rate. For coding layer, we employed PyEClib source on GitHub (1.5.0) module with liberasurecode source on GitHub (1.5.0) as Interface to erasure back-ends for Reed-Solomon coding.

4.2.  Preliminary test

To evaluate the actual performance, we first examined the performance of our algorithm by measuring the execution time in the server (source) and cloud storage (destination) processes for a data, depending on the file size and variability of RS parameters k and m.

In Table 1 below, we showed the average operating time for the source and destination for each process. It is quite apparent that the source average is mainly estimated by the slicing process because it involves additional parameters and computations than the other internal operations.

Table 1: Average execution time in the source/destination.

The throughput define as that is the amount sum of processed data that execute in a period of time (processed data /second) [15].  It is concluded as the following relation:

Where W is indicated as the workload, T_P as the execution time required to accomplish the calculation using P processors [16], p is index as written in equation (3). From equation 3, the throughput for each location is shown in the Table 2. Table 2 depicts the comparison between the average throughputs of transmitting many file sizes between Oregon and Amsterdam locations. The transfer throughput gained for Oregon and Amsterdam is ~.9, .7 MB/ms respectively. The range of throughput achieved when transferring the file is astonishingly large. It was observed that the throughput rate does not follow a certain way; the variation seems to arise randomly.

Table 2: Locations Transfer Throughput.

4.3.  Result

Figure 5 and Figure 6 are linearly dependent features and are just shown for further clarification. It is verifiable that by choosing bigger fault tolerance rate in the coding stage (smaller k in proportion to m) the final transfer time increases rapidly. It is shown that transferring bigger files with no-error tolerance (k =m) added in the coding stage, the system will exhibit the best performance, especially in case of bigger file sizes. Choosing k such that it covers 10-15% error correction without the need for data retransmission in smaller file sizes less than 24MB, the impact on transmission time is noticeably less than the profit it brings.

Figure 5: Average execution time in source side.

Figure 6: Average execution time in destination.

In Figure 7, we portray a 2D graph of the speedup rate against data size for a different number of processors. It can be noted that analogous to our model, speedup cannot be obtained for the data migration that is below 0.5GB by using 2, 4, 8, and 16 parallel processors. The overall note is steady with our approach, the speedup is extremely poor for small file size, but increases for bigger file size.

Although the speedup rate is not computed yet in the real environment, we found an independent argument that can be used in our model to compute the speedup in the real environment. Based on our observation, the independent argument is close to 0.47. Hence, we are certain about the fact that when the count of parallel processors is greater than 8 and the data size is bigger than 1GB, the speedup will be achieved.

Figure 7: Comparing actual speedup and our model for parallel transfer, where p is the number of processors.

5. Conclusion and Future Work

This paper concentrated on explaining and exhibiting a parallel design for data transmission in cloud environment. First, we demonstrated the proposed model. Next, we presented the implementation and evaluation of the proposed model. Though our parallel transfer model shows a prospect to enhance the performance, however, our implementation exposed that there is an independent argument that should be considered. This study also suggests that there are overhead factors that can affect the parallel transfer performance, such as initialization, chunking the data file, and transfer time. Thus, those overhead effects should be investigated in order to reach maximum performance. In brief, we should consider the computation of hardware power and processors I/O’s speed that is assigned by the CSP to design the parallel migration model.

Conflict of Interest

The authors declare no conflict of interest.

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20. Ahmad AA Alkhatib, Abeer Alsabbagh, Randa Maraqa, Shadi Alzubi, "Load Balancing Techniques in Cloud Computing: Extensive Review", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 860–870, 2021. doi: 10.25046/aj060299
21. Bismark Tei Asare, Kester Quist-Aphetsi, Laurent Nana, "Node-Node Data Exchange in IoT Devices Using Twofish and DHE", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 622–628, 2021. doi: 10.25046/aj060271
22. Rubin Thottupurathu Jose, Sojan Lal Poulose, "Ontology Based Privacy Preservation over Encrypted Data using Attribute-Based Encryption Technique", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 378–386, 2021. doi: 10.25046/aj060244
23. Khadija Alaoui, Mohamed Bahaj, "Categorization of RDF Data Management Systems", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 221–233, 2021. doi: 10.25046/aj060225
24. Javier Stillig, Nejila Parspour, "Novel Infrastructure Platform for a Flexible and Convertible Manufacturing", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 356–368, 2021. doi: 10.25046/aj060141
25. Sinh-Huy Nguyen, Van-Hung Le, "Standardized UCI-EGO Dataset for Evaluating 3D Hand Pose Estimation on the Point Cloud", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 1–9, 2021. doi: 10.25046/aj060101
26. Karamath Ateeq, Manas Ranjan Pradhan, Beenu Mago, "Elasticity Based Med-Cloud Recommendation System for Diabetic Prediction in Cloud Computing Environment", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1618–1633, 2020. doi: 10.25046/aj0506193
27. Hesham Aly El Zouka, Mustafa Mohamed Hosni, "Time Granularity-based Privacy Protection for Cloud Metering Systems", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1278–1285, 2020. doi: 10.25046/aj0506152
28. Le Duc Hanh, Huynh Buu Tu, "Computer Vision for Industrial Robot in Planar Bin Picking Application", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1244–1249, 2020. doi: 10.25046/aj0506148
29. Mohamed Hedi Fourati, Soumaya Marzouk, Mohamed Jmaiel, Tom Guerout, "Docker-C2A : Cost-Aware Autoscaler of Docker Containers for Microservices-based Applications", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 972–980, 2020. doi: 10.25046/aj0506116
30. Nagaraj Vannal, Saroja V Siddamal, "Design and Implementation of DFT Technique to Verify LBIST at RTL Level", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 937–943, 2020. doi: 10.25046/aj0506111
31. Giorgia Franchini, Roberto Cavicchioli, Jia Cheng Hu, "Automatic Stochastic Dithering Techniques on GPU: Image Quality and Processing Time Improved", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 652–663, 2020. doi: 10.25046/aj050679
32. Pearl Keitemoge, Daniel Tetteh Narh, "Effective Application of Information System for Purchase Process Optimization", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 594–605, 2020. doi: 10.25046/aj050673
33. Kin Yun Lum, Yeh Huann Goh, Yi Bin Lee, "American Sign Language Recognition Based on MobileNetV2", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 481–488, 2020. doi: 10.25046/aj050657
34. Naeem Ahmed Haq Nawaz, Hamid Raza Malik, Ahmed Jaber Alshaor, Kamran Abid, "A Simulation Based Proactive Approach for Smart Capacity Estimation in the Context of Dynamic Positions and Events", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 423–438, 2020. doi: 10.25046/aj050651
35. Puttakul Sakul-Ung, Amornvit Vatcharaphrueksadee, Pitiporn Ruchanawet, Kanin Kearpimy, Hathairat Ketmaneechairat, Maleerat Maliyaem, "Overmind: A Collaborative Decentralized Machine Learning Framework", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 280–289, 2020. doi: 10.25046/aj050634
36. Sarot Srang, Sopagna Ath, Masaki Yamakita, "Newton-Euler Based Dynamic Modeling and Control Simulation for Dual-Axis Parallel Mechanism Solar Tracker", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 709–716, 2020. doi: 10.25046/aj050587
37. Kofi Osei-Tutu, Yeong-Tae Song, "Enterprise Architecture Institutionalization for Health Information Exchange (HIE) Cloud Migration", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 680–691, 2020. doi: 10.25046/aj050584
38. Oleksandra Mrykhina, Lidiya Lisovska, Ihor Novakivskyj, Terebukh, Valentyna Zhukovska, "Method of Modelling Prices for R&D Products in the Case of their Transfer from Engineering Universities to the Business", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 80–93, 2020. doi: 10.25046/aj050512
39. Sushma Padubidri Shivaprasad, Sreemannarayanay Kulkarni, "Low Power Bulk Driven Series Parallel OTA for Low Frequency Applications", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 69–73, 2020. doi: 10.25046/aj050510
40. Sanaz Gheibi, Tania Banerjee, Sanjay Ranka, Sartaj Sahni, "Fine Tuning the Performance of Parallel Codes", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 824–840, 2020. doi: 10.25046/aj050497
41. Nghia Duong-Trung, Luyl-Da Quach, Chi-Ngon Nguyen, "Towards Classification of Shrimp Diseases Using Transferred Convolutional Neural Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 724–732, 2020. doi: 10.25046/aj050486
42. Yulyanty Chandra, Roy Willis, Calvin Windoro, Sfenrianto, "Business Process Design for Widuri Indah School Management System with the Support of Cloud Computing", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 536–539, 2020. doi: 10.25046/aj050366
43. Anisur Rahman, "Non Parallelism and Cayley-Menger Determinant in Submerged Localization", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 150–157, 2020. doi: 10.25046/aj050320
44. Basem Assiri, "Using Leader Election and Blockchain in E-Health", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 46–54, 2020. doi: 10.25046/aj050307
45. Bayan O Al-Amri, Mohammed A. AlZain, Jehad Al-Amri, Mohammed Baz, Mehedi Masud, "A Comprehensive Study of Privacy Preserving Techniques in Cloud Computing Environment", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 419–424, 2020. doi: 10.25046/aj050254
46. Hind El Hassani, Nour- Eddine Boutammachte, Sanae El Hassani, "Optimization of Low Temperature Differential Stirling Engine Regenerator Design", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 272–279, 2020. doi: 10.25046/aj050235
47. Mihaela Balanescu, George Suciu, Marius-Alexandru Dobrea, Cristina Balaceanu, Radu-Ioan Ciobanu, Ciprian Dobre, Andrei-Cristian Birdici, Andreea Badicu, Iulia Oprea, Adrian Pasat, "An Algorithm to Improve Data Accuracy of PMs Concentration Measured with IoT Devices", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 180–187, 2020. doi: 10.25046/aj050223
48. Lenin G. Falconi, Maria Perez, Wilbert G. Aguilar, Aura Conci, "Transfer Learning and Fine Tuning in Breast Mammogram Abnormalities Classification on CBIS-DDSM Database", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 154–165, 2020. doi: 10.25046/aj050220
49. Jorge Castro Bedriñana, Doris Chirinos Peinado, Richard Peñaloza-Fernández, "Lead Bioaccumulation in Root and Aerial Part of Natural and Cultivated Pastures in Highly Contaminated Soils in Central Andes of Peru", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 126–132, 2020. doi: 10.25046/aj050216
50. Mohamed Saleh Al Breiki, Suiping Zhou, Yuan Roger Luo, "Design and Validation of a Meter Band Rate in OpenFlow and OpenDaylight for Optimizing QoS", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 35–43, 2020. doi: 10.25046/aj050205
51. Nour Mostafa, "Resource Selection Service Based on Neural Network in Fog Environment", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 1, pp. 408–417, 2020. doi: 10.25046/aj050152
52. Vladyslav Kucher, Jens Hunloh, Sergei Gorlatch, "Performance Portability and Unified Profiling for Finite Element Methods on Parallel Systems", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 1, pp. 119–127, 2020. doi: 10.25046/aj050116
53. Saleh Albahli, Rehan Ullah Khan, Ali Mustafa Qamar, "A Blockchain-Based Architecture for Smart Healthcare System: A Case Study of Saudi Arabia", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 1, pp. 40–47, 2020. doi: 10.25046/aj050106
54. Youssef Bikrat, Khalid Salmi, Kamal Azghiou, Ahmad Benlghazi, Abdelhamid Benali, and Driss Moussaid, "Intelligent Wireless System for PV Supervision Based on The Raspberry Pi", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 6, pp. 94–98, 2019. doi: 10.25046/aj040611
55. Khalil Hariss, Maroun Chamoun, Abed Ellatif Samhat, "Fully Homomorphic Encryption Scheme Based On Complex Numbers", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 5, pp. 30–38, 2019. doi: 10.25046/aj040504
56. Ahmed Elsayed ELGebaly, Mohamed Kamal El-Nemr, "Optimized Design of PM Halbach Array Linear Generator for Sea Wave Energy Converters Operate at Maximum Power Transfer", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 440–448, 2019. doi: 10.25046/aj040453
57. Darya Denisenko, Nikolay Prokopenko, Nikolay Butyrlagin, "All-Pass RC-Filters Architecture with Independent Adjustment of the Main Parameters Based on Differential Difference Amplifiers", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 65–72, 2019. doi: 10.25046/aj040409
58. Mahmut ÜN, "Transfer Function Analysis of Fractional-Order Three-Dimensional Electrically Coupled Cell Network", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 3, pp. 145–149, 2019. doi: 10.25046/aj040319
59. Isaac Odun-Ayo, Blessing Udemezue, Abiodun Kilanko, "Cloud Service Level Agreements and Resource Management", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 2, pp. 228–236, 2019. doi: 10.25046/aj040230
60. Isaac Odun-Ayo, Blessing Idoko, Temidayo Abayomi-Zannu, "Virtualization in Cloud Environment: Bandwidth Management", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 2, pp. 221–227, 2019. doi: 10.25046/aj040229
61. Samraj Daphni, Kasinadar Sundari Vijula Grace, "Design and Analysis of 32-bit Parallel Prefix Adders for Low Power VLSI Applications", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 2, pp. 102–106, 2019. doi: 10.25046/aj040213
62. Isaac Odun-Ayo, Rowland Goddy-Worlu, Victor Geteloma, Emanuel Grant, "A Systematic Mapping Study of Cloud, Fog, and Edge/Mobile Devices Management, Hierarchy Models and Business Models", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 2, pp. 91–101, 2019. doi: 10.25046/aj040212
63. Lev Lafayette, Bernd Wiebelt, Dirk von Suchdoletz, Helena Rasche, Michael Janczyk, Daniel Tosello, "The Chimera and the Cyborg", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 2, pp. 1–7, 2019. doi: 10.25046/aj040201
64. János Végh, József Vásárhelyi, Dániel Drótos, "Can parallelization save the (computing) world?", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 141–158, 2019. doi: 10.25046/aj040114
65. Waleed Al Shehri, Maher Khemakhem, Abdullah Basuhail, Fathy E. Eassa, "A Proposed Architecture for Parallel HPC-based Resource Management System for Big Data Applications", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 40–44, 2019. doi: 10.25046/aj040105
66. Tan Lay Tatt, Lim Boon Huat, Rosli Muhammad Tarmizi, T. Joseph Sahaya Anand, "Perfect Molding Challenges and The Limitations “A Case Study”", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 6, pp. 489–495, 2018. doi: 10.25046/aj030657
67. Lili Liu, Estee Tan, Zhi Qiang Cai, Xi Jiang Yin, Yongda Zhen, "CNN-based Automatic Coating Inspection System", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 6, pp. 469–478, 2018. doi: 10.25046/aj030655
68. Mohammad Harun Rashid, Lixin Tao, "Parallelizing Combinatorial Optimization Heuristics with GPUs", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 6, pp. 265–280, 2018. doi: 10.25046/aj030635
69. Nam Yoon Kim, Jinsung Cho, and Chang-Woo Kim, "An Improved Cross-Connection Abatement Algorithm with RSSI Using In-Band Magnetic Field Control in Densely Located LC Wireless Charger Environments", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 6, pp. 247–251, 2018. doi: 10.25046/aj030632
70. Lin Dong, Akira Rinoshika, "Analysis and Methods on The Framework and Security Issues for Connected Vehicle Cloud", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 6, pp. 105–110, 2018. doi: 10.25046/aj030611
71. Takahiro Koita, Yu Manabe, "Similarity-based Resource Selection for Scientific Workflows in Cloud Computing", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 6, pp. 67–73, 2018. doi: 10.25046/aj030606
72. Saurin Patel, Rick Walker, "Minimally Invasive, Thermal Energy Based, Cost-Efficient Method to Measure Fluid Flows in Compact Systems", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 454–458, 2018. doi: 10.25046/aj030552
73. Kabita Luitel, Dil Bahadur Gurung, Kedar Nath Uprety, "Effect of Various Parameters for Temperature Distribution in Human Body: An Analytic Approach", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 421–426, 2018. doi: 10.25046/aj030548
74. Rui Wu, Connor Scully-Allison, Moinul Hossain Rifat, Jose Painumkal, Sergiu Dascalu, Jr. Frederick C Harris, "Virtual Watershed System: A Web-Service-Based Software Package For Environmental Modeling", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 382–393, 2018. doi: 10.25046/aj030544
75. Won-Bin Kim, Im-Yeong Lee, "A Study on Improving Security and Efficiency using Dynamic Ownership Management in Client-Side Deduplication Environments", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 267–276, 2018. doi: 10.25046/aj030532
76. Mohamed Adel Serhani, Hadeel Al Kassabi, Ikbal Taleb, "Towards an Efficient Federated Cloud Service Selection to Support Workflow Big Data Requirements", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 235–247, 2018. doi: 10.25046/aj030529
77. Mouhamad Chehaitly, Mohamed Tabaa, Fabrice Monteiro, Juliana Srour, Abbas Dandache, "FPGA Implementation of Ultra-High Speed and Configurable Architecture of Direct/Inverse Discrete Wavelet Packet Transform Using Shared Parallel FIR Filters", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 116–127, 2018. doi: 10.25046/aj030516
78. Helen Hasenfuss, Muftah Fraifer, Sameer Kharel, Asma Elmangoush, Alan Ryan, Walid Elgenaidi, "It Takes Two to Tango: Merging Science and Creativity to Support Continued Innovation in the IoT Domain", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 5, pp. 82–91, 2018. doi: 10.25046/aj030511
79. Laud Charles Ochei, Christopher Ifeanyichukwu Ejiofor, "Evaluating the effect of Locking on Multitenancy Isolation for Components of Cloud-hosted Services", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 3, pp. 92–99, 2018. doi: 10.25046/aj030312
80. Thabat Thabet, John Woods, "Using Input Impedance to Calculate the Efficiency Numerically of Series-Parallel Magnetic Resonant Wireless Power Transfer Systems", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 3, pp. 38–42, 2018. doi: 10.25046/aj030305
81. Mohammad Hossain, Sameer Abufardeh, Sumeet Kumar, "Frameworks for Performing on Cloud Automated Software Testing Using Swarm Intelligence Algorithm: Brief Survey", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 2, pp. 252–256, 2018. doi: 10.25046/aj030229
82. Laud Charles Ochei, Christopher Ifeanyichukwu Ejiofor, "A Model for Optimising the Deployment of Cloud-hosted Application Components for Guaranteeing Multitenancy Isolation", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 2, pp. 174–183, 2018. doi: 10.25046/aj030220
83. Mohammed Abdulkareem Alyami, Majed Almotairi, Alberto R. Yataco, Yeong-Tae Song, "Improving Patient Outcomes Through Untethered Patient-Centered Health Records", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 2, pp. 164–173, 2018. doi: 10.25046/aj030219
84. Zheng Li, Maria Kihl, Yiqun Chen, He Zhang, "Two-Stage Performance Engineering of Container-based Virtualization", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 1, pp. 521–536, 2018. doi: 10.25046/aj030163
85. Eleni Bougioukou, Nikolaos Toulgaridis, Maria Varsamou, Theodore Antonakopoulos, "Hardware Acceleration on Cloud Services: The use of Restricted Boltzmann Machines on Handwritten Digits Recognition", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 1, pp. 483–495, 2018. doi: 10.25046/aj030159
86. Vinicius Zimmermann Silva, Ângelo Jose Junqueira Rezek, Rafael Di Lorenzo Corrêa, "Novel Analysis of Synchronous and Induction Generators in Parallel Operation Mode in an Isolated Electric System", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 6, pp. 203–216, 2017. doi: 10.25046/aj020625
87. Mustafa Oezguel, Florian Deeg, Sebastian M. Sattler, "Mealy-to-Moore Transformation – A state stable design of automata", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 6, pp. 162–174, 2017. doi: 10.25046/aj020621
88. Mario Brcic, Nikica Hlupic, Nenad Katanic, "Distributing the computation in combinatorial optimization experiments over the cloud", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 6, pp. 136–144, 2017. doi: 10.25046/aj020617
89. Yahav Biran, Sudeep Pasricha, George Collins, Joel Dubow, "Clean Energy Use for Cloud Computing Federation Workloads", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 6, pp. 1–12, 2017. doi: 10.25046/aj020601
90. Mouhamad Chehaitly, Mohamed Tabaa, Fabrice Monteiro, Abbas Dandache, "A Novel Ultra High Speed and Configurable Discrete Wavelet Packet Transform Architecture", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 1129–1136, 2017. doi: 10.25046/aj0203142
91. Shou-Chih Lo, Ya-Wen Cheng, "Improving the Performance of Fair Scheduler in Hadoop", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 1050–1058, 2017. doi: 10.25046/aj0203133
92. Luis Jimenez, Luis Vilcahuaman, Jorge Galdos, "Assessment of the heat sinking effect of a human hand that holds a flexible phototherapy device for use in Kangaroo Mother Care", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 805–811, 2017. doi: 10.25046/aj0203101
93. Yahav Biran, George Collins, Borky John M, Joel Dubow, "Semantic-less Breach Detection of Polymorphic Malware in Federated Cloud", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 553–561, 2017. doi: 10.25046/aj020371
94. Fernando Yepes-Calderon, Olivier Beuf, "Homemade array of surface coils implementation for small animal magnetic resonance imaging", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 532–539, 2017. doi: 10.25046/aj020368
95. Ben Charhi Youssef, Mannane Nada, Bendriss Elmehdi, Regragui Boubker, "Intrusion detection in cloud computing based attack patterns and risk assessment", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 479–484, 2017. doi: 10.25046/aj020361
96. Sarra Alqahtani, Rose Gamble, "Verifying the Detection Results of Impersonation Attacks in Service Clouds", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 449–459, 2017. doi: 10.25046/aj020358
97. Mahmut Ün, Manolya Ün, "Analysis of Fractional-Order 2xn RLC Networks by Transmission Matrices", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 217–220, 2017. doi: 10.25046/aj020329
98. Raid Khalid Hussein, Ahmed Alenezi, Hany F. Atlam, Mohammed Q Mohammed, Robert J. Walters, Gary B. Wills, "Toward Confirming a Framework for Securing the Virtual Machine Image in Cloud Computing", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 4, pp. 44–50, 2017. doi: 10.25046/aj020406
99. Adrian Popovici, Mircea Băbăiţă, Petru Papazian, "Optimal Synthesis of Universal Space Vector Digital Algorithm for Matrix Converters", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 147–152, 2017. doi: 10.25046/aj020319
100. Carlos Moreno, Ming Li, "Frame Filtering and Skipping for Point Cloud Data Video Transmission", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 1, pp. 76–83, 2017. doi: 10.25046/aj020109