1. Introduction

      Platforms for IoT (Internet of Things) have become key components in measurement and control systems because they are able to ingest, store and analyze huge quantities of data, on a 24/7 basis, at reasonable prices. They are hosted on the “cloud”, which is a fancy name for data centers spread all over the world, equipped with high bandwidth, large storage capacity, and heavy processing power.

The term “cloud” is interesting because IoT platforms have indeed a broader view of the physical processes, as they were somewhere above in the sky. They have a broader view in terms of space because they gather data from different locations, and a broader view in terms of time because they store data persistently. This new level of awareness has flattened the traditional five-level automation pyramid [1] because field devices can now communicate directly with the cloud. Intermediate levels are being bypassed leading to an horizontal structure that is the basis of “smart factory” and “connected manufacturing” [2], two core concepts of “industry 4.0” [3].

Today, the cloud concentrates huge amounts of data making it the ideal place to run large-scale data analytics. Deep leaning, based on artificial neural networks, has benefited a lot from this scenario because it needs lots of data (big data) to perform well. As long as the data are good (big and diverse), deep learning is able to find good computational models for complex processes, even the hardest ones. With a good model in hands, new things can be done (such as preventive maintenance, and just-in-time asset management), and old things can be improved (such as robust control algorithms, and automatic controller tuning). IoT platforms play a key role in this movement because they are the “stage” where things are happening.

IoT platforms began to be used at the top of the  automation pyramid because these levels do not need accurate timing. Typical applications include monitoring and supervision [4]–[10], with the goal of reducing or removing humans in the loop [11]. There are also some applications for closed-loop control [12], [13], but the constrains in terms of low-latency and real-time make harder the penetration of IoT platforms at lower automation levels.

Whether IoT platforms are used for monitoring, supervision, or real-time control, it is important to know how fast and reliable they are. For that purpose, we took a well-known IoT platform – the ThingSpeak platform [14] – and measured the time it takes to upload a data packet and receive a reply. This so-called “roundtrip time” is an indicator of how fast the platform is. By checking the resemblance of both packets, outgoing and incoming, we can also have an idea on how reliable the platform is. We chose ThingSpeak because it is very easy to use, is open source, is free (with some restrictions), has an active community, and provides a comprehensive set of features, including persistent data storage, data analytics based on MATLAB, easy access through ubiquitous protocols, and security over SSL. For these reasons, the ThingSpeak is one of the makers’ favorite platforms [15].

There are similar works trying to characterize experimentally the behavior of cloud servers and IoT platforms. For example, in [16], the author gives a tutorial on network latency measurements using PlanetLab as testbench. He measured the roundtrip times of mobile and non-mobile devices, connected through wireless (WiFi and 3G) and wired (Ethernet) interfaces, while pinging five different AWS servers spread around the world. In [17], the author and his team studied the performance of a cloud database by measuring the time needed to complete a writing on the database and getting back a reaction. They used a Siemens PLC to generate data, the IBM Cloud to store data and fire events, and an industrial computer to catch those events, all connected through a MQTT broker. In [18], the author measured the roundtrip time associated to a MQTT broker when it was accessed from two different continents (Brescia in Europe and São Paulo in South America). In [19], the author evaluated the efficiency and roundtrip time of three protocols commonly used in IoT, namely CoAP (constrained application protocol), WebSockets, and MQTT (message queue telemetry transport). In [20], the author made a quantitative performance analysis of the CoAP and MQTT protocols over various conditions of network capacity, packet loss probability, and link delay. In all these works, a substantial effort was put in characterizing experimentally the behavior of cloud services and the protocols used to access them.

The remaining of this paper is organized as follows: section 2 gives an overview of the ThingSpeak platform; sections 3 and 4 analyze the latencies of the ThingSpeak platform when it is accessed through two different application programming interfaces (API); section 5 focus on the ThingSpeak MQTT broker alone; section 6 discusses the obtained results; and section 7 extracts conclusions.

2. ThingSpeak

The ThingSpeak platform provides resources to store and process data in the cloud. The data are accessed through two well documented APIs: a REST API [21] that communicates over HTTP and follows the request-response model; and a MQTT API [22] that communicates over TCP/IP and follows the publish-subscribe model. Both APIs support authentication through unique read/write keys, but only the REST API supports data encryption through HTTPS. The REST API works well for one-to-one communications, while the MQTT API is best suited for one-to-many communications. The ThingSpeak MQTT broker only supports QoS = 0 (equivalent to “deliver at most once” or “fire-and-forget”).

The ThingSpeak platform organizes information in data channels. Each channel includes eight fields that can hold any data type, plus three fields for location, and one field for status. Each channel is also characterized by a unique ID, a name, and a free description. It is not possible to access the fields individually; all read/write operations are made at the channel level to optimize remote calls. All incoming data receive a sequential ID and a timestamp (with a 1 second resolution). Channels are private by default, but they can also be made public in which case no read key is required. Channels are provided at no charge for non-commercial projects as long as they require no more than 8200 messages/day (~5 messages/minute).

The ThingSpeak provides the following resources to control the dataflow:

• React: Executes an action when stored data meet a certain condition (e.g. when a given field of a given channel crosses a given threshold). The action can be as simple as the execution of a script or the issue of a remote message over HTTP.
• TimeControl: Orders the execution of an action once at a specific time, or periodically on a regular schedule, much like a software timer. The TimeControl supports the same actions as the React.
• ThingHTTP: Is a remote call over HTTP, useful to communicate with remote entities such as devices, websites, and web services.

Figure 1: Dataflow inside the ThingSpeak platform

      The ThingSpeak platform relies on MATLAB scripts to process stored data. Scripts can be associated to a TimeControl to run one-time or periodically, or to a React to run whenever a given condition is met. Scripts can use the MATLAB toolboxes listed in [23], as long as the user logs into ThingSpeak using its MathWorks account and is licensed to use them. This opens the door to powerful data analytics, supported by robust and well-known software libraries. The results can be visualized on the web, directly from the ThingSpeak site, through ready-to-use charts. The visualization experience can also be enriched with custom widgets and MATLAB plots.

      Figure 1 shows the dataflow through the ThingSpeak platform. Data are ingested, stored in a database, and (optionally) analyzed by scripts that run periodically or when a given condition is met. Messages can be sent to third-party applications by a pre-configured ThingHTTP, or by a pre-programmed script using MATLAB functions. The present work focusses on measuring the time it takes to upload data and receive a reply, assuming no processing is made in the interim.

3. ThingSpeak accessed through the REST API

      In this section we analyze the performance of the ThingSpeak platform when it is accessed through the REST API. We first explain the methodology used to measure latencies and then we present results.

3.1. Methodology

      To measure REST API latencies, we built the closed data path shown in Figure 2, which includes the following stages (the numbers in the list correspond to the numbers in the drawing):

1. LabVIEW application: Is a custom application that runs on our local machine. It makes HTTP calls to the ThingSpeak server, collects the replies, and computes the time elapsed.Each call is a GET request that uploads an order number (n) that is incremented to identify the request. The timestamp of the request (t_n0) is registered to serve as reference for the roundtrip
2. ThingSpeak channel (name = TestChannel; ID = 515584; access = private): The channel contains a single field (Field1) to store the order number uploaded by the LabVIEW application.
3. React (condition type = numeric; test frequency = on data insertion; condition = TestChannel.Field1 ≥ 0; run = each time the condition is met): A reaction is fired each time a positive order number is received (which is always because n is an unsigned integer). The reaction instructs the MATLAB script to run (see below).
4. MATLAB script: Collects the timestamp at the ThingSpeak server and makes an HTTP call back to the local machine. As shown in Figure 3, the script is programmed to make a POST request to a web service running on the same machine as the LabVIEW application. The request sends back the order number and the timestamp at the ThingSpeak server (t_n).
5. Router: Accesses from the local machine to an external server are inherently safe and the router forwards them transparently. However, connections in the opposite direction are potentially dangerous and are blocked by default. To overcome this problem, we had to forward port 80 on the local router, so that POST requests coming from the ThingSpeak server reach the LabVIEW web service. In other words, we had to expose the LabVIEW web service to the internet.
6. LabVIEW web service: Is a stateless routine that receives a POST request, extracts the attached order number (n) and timestamp (t_n), and registers the timestamp of the reply (t_n1). The triplet (n, t_n, t_n1) is then sent back to the LabVIEW application by means of a UDP socket. The web service is hosted by the NI Application Web Server running on port 80 of the local machine.
7. UDP socket (URL = localhost; port = 61557): An external agent is needed to transfer data from the LabVIEW web service to the LabVIEW application because they are two separate processes. That agent is a simple UDP socket that listens for incoming data on port 61557. The LabVIEW application takes the triplet (n, t_n, t_n1), adds the first timestamp (t_n0), and writes the quartet (n, t_n0, t_n, t_n1) into the output file for further processing.

Figure 2: Data loop through the ThingSpeak server

Figure 3: MATLAB script. The reading key of the channel and the IP address of the LabVIEW web service were erased for privacy

      The LabVIEW application and the LabVIEW web service run both on our local machine (Intel i7-8550 CPU @ 1.80 GHz, RAM 16 GB, SSD 512 GB, NVIDIA GeForce MX150). The machine connects to an Ethernet port of a general-purpose router (model HS8247W from Huawei), which accesses the internet through a fiber optic link provided by Vodafone Portugal.

The LabVIEW application uploads order umbers (n) at multiples of 20 seconds to respect ThingSpeak free account limitations. On the nth upload, the quartet (n, t_n0, t_n, t_n1) is saved on the nth line of the output file. Thus, it is possible to record the timelines shown in Figure 4, where the t axis represents the timeline of the ThingSpeak server, and the t axis represents the timeline of the local machine. Of course, the two timelines are not aligned because the clocks of the two systems are not synchronized. Yet, we can extract the following quantities from these timelines:

where RT represents the roundtrip time, D represents the uplink delay, dD represents the difference between consecutive uplink delays, d represents the downlink delay, and dd represents the difference between consecutive downlink delays. The output file contains all the timestamps (t’s and t’s) needed to compute equations (1), (2) and (3).

Figure 4: Timelines at the local machine (t axis) and ThingSpeak server (t axis)

Figure 5: Roundtrip times of the REST API: a) plot; b) histogram

3.2. Results

      We ran the closed loop illustrated in Figure 2 for 1080 times, from n=0 to n=1079, waiting approximately 20 seconds on each iteration. This number (1080) was a compromise between having statistically relevant results and limiting the test to a reasonable amount of time (almost six hours).  Figure 5a shows the measured roundtrip times, and Figure 5b shows the corresponding histogram. The order number (n) was always replied correctly, which attests the robustness of the ThingSpeak platform.

      From Figure 5b we see that the roundtrip time has a heavy-tailed distribution, which is characteristic of multipath communication mediums as the Internet. The authors in [24] report similar results and suggest a lognormal distribution for the experimental data. In our case, we got mode = 1,66 s and a roundtrip time that is less than 2.9 s with a probability of 80%.

Figure 6: Difference between consecutive delays: a) uplink; b) downlink

Nevertheless, every 10 min (around 30 points) the roundtrip time increases very sharply up to tens of seconds, suggesting that the ThingSpeak platform stores data in temporary buffers, which, from time to time, are flushed and processed.

      Figure 6 shows the difference between consecutive delays on the uplink and downlink directions. The differences are positive and negative because a higher delay on one iteration discounts on the next iteration. As expected, the uplink delay (D) is less stable than the downlink delay (d) because the upload process is more complex than the reply (in terms of ThingSpeak internals).

If we suppose that consecutive uplink delays are statistically independent, which makes sense because they correspond to different iterations, then the variance of the difference (dD or dd) will be twice of the variance of the variable itself (D or d). Therefore, if we compute the variances Var(dD) and Var(dd)  from the data of Figure 6, and divide the result by two, we get the variances of the delays: Var(D) = 37.52 s² and Var(d) = 7.29 s². Applying the squared root, we get the standard deviations: s_D = 6.13 s and s_d = 2.70 s.

      Finally, it is very difficult to infer about the mean value of the uplink and downlink delays because the clocks of the two systems are not synchronized and, equally important, the two links are far from being symmetric.

4. ThingSpeak accessed through the MQTT API

      In this section we analyze the performance of the ThingSpeak platform when it is accessed through the MQTT API. To measure MQTT API latencies, we built the closed data path shown in Figure 7, which is like that of Figure 2 with the difference that the order numbers are uploaded through the MQTT broker. The LabVIEW application was changed to publish order numbers (n) using a compatible MQTT driver [25]. The quartets (n, t_n0, t_n, t_n1) were collected and saved into the output file as before.

Figure 7: Data loop through the MQTT broker and ThingSpeak server

Figure 8: Roundtrip times of the MQTT API: a) plot; b) histogram

      We ran the closed loop 1080 times waiting approximately 20 seconds on each iteration. Figure 8a shows the measured roundtrip times, and Figure 8b shows the corresponding histogram. Again, the order number (n) was always replied correctly, with no mismatches or timeouts. From the graphs, we see that the roundtrip time follows a lognormal distribution with mode = 1,13 s and values below 2,8 s with a probability of 80%. We also see outliers coming every 10 min (as we saw in the REST API), suggesting that internal mechanisms of buffering and batch processing also apply to the MQTT API.

      The random variables dD and dd were also computed as before. The corresponding variances were extracted and divided by two, leading to Var (D) = 51.53 s² and Var (d) = 5.99 s². Applying the squared root, we got the standard deviations of the uplink and downlink delays: s_D = 7.18 s and s_d = 2.45 s.

5. MQTT broker alone

      To analyze the performance of the MQTT broker alone we closed the loop without passing through the ThingSpeak server, as shown in Figure 9. The LabVIEW application was changed to publish order numbers (n) and subscribe the replies using the MQTT driver previously mentioned. In this case, only the triplets (n, t_n0, t_n1) were collected because the timeline of the ThingSpeak server (t axis) is not available.

      We ran the closed loop 1080 times waiting approximately 20 seconds on each iteration. Figure 10.a shows the measured roundtrip times, and Figure 10.b shows the corresponding histogram. As always, the order number (n) was always replied correctly, with no mismatches or timeouts. From the graphs, we see that the roundtrip time follows a lognormal distribution with mode = 0.189 s, and values below 0,250 s with a probability of 80%. We also see that the outliers observed in the previous tests have almost disappeared. This shows that the MQTT broker is more expeditious than the ThingSpeak server, probably because its buffering and processing needs are much less demanding.

6. Results and Discussions

Table 1 summarizes the latencies measured during all the experiments. From these results we can extract the following conclusions:

• The REST and MQTT APIs have similar performances with a slightly advantage for the MQTT API. In both cases, the roundtrip time was typically between 1 s and 3 s.
• The ThingSpeak server has internal mechanisms of buffering and batch processing that, periodically, introduce extraordinary delays. These mechanisms seem to be absent from the MQTT broker.
• The MQTT broker is very agile in distributing publications, with roundtrip times typically below 250 ms.
• The up and down links are far from being symmetric. The uplink is more complex since it has a higher variance.
• The tests lasted for several hours and were made in different days and in different times of the day, suggesting that the behavior of the ThingSpeak platform is time independent.

A final word about robustness: the order number (n) was never lost or corrupted, proving that the ThingSpeak is reliable, even for free accounts.

Figure 9: Data loop through the MQTT broker only

Figure 10: Roundtrip times of the MQTT broker alone (a) plot (b) histogram

Table 1: Experimental characterization of the ThingSpeak platform

7. Conclusions

The paper reported the studies carried on the ThingSpeak platform to evaluate its responsiveness and reliability. We measured the time needed for a data packet to loop back through the platform, and we verified if its content has been corrupted during the trip. Tests were made for all access mediums (REST API, MQTT API and MQTT alone) covering periods of six hours.

We saw that the REST and MQTT APIs have similar performance with typical roundtrip times between 1s and 3s. We observed repetitive outliers that suggest that the ThingSpeak server has periodic mechanisms of buffering and batch processing. The MQTT broker alone did not show such outliers and performed significantly faster. In terms of reliability, no data was lost or corrupted.

We hope that the obtained results can serve as a reference for other IoT platforms and provide guidelines for application development.

Conflict of Interest

The authors declare no conflict of interest.

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23. Yanlin Pan, Pik Kee Tan, Siong Luong Ting, Chang Qing Chen, Hao Tan, Naiyun Xu, Krishnanunni Menon, Hnin Hnin Win Thoungh Ma, Kyaw Htin, "Advanced Physical Failure Analysis Techniques for Rescuing Damaged Samples with Cracks, Scratches, or Unevenness in Delayering", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 4, pp. 52–61, 2021. doi: 10.25046/aj060407
24. Antonio Casquero Jiménez, Jorge Pérez Martínez, "Remote Patient Monitoring Systems with 5G Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 4, pp. 44–51, 2021. doi: 10.25046/aj060406
25. Niranjan Ravi, Mohamed El-Sharkawy, "Enhanced Data Transportation in Remote Locations Using UAV Aided Edge Computing", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 1091–1100, 2021. doi: 10.25046/aj0602124
26. Mitsumasa Hida, Ayuna Hasegawa, Sachiyo Kamitani, Yumi Kamitani, Kodai Kitagawa, Shogo Okamatsu, Tadasuke Ohnishi, Seigo Minami, Chikamune Wada, "Coronal Spinal Postural Alignment Screening Tool using Markerless Digital Photography", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 965–970, 2021. doi: 10.25046/aj0602110
27. Murtadha Arif Bin Sahbudin, Chakib Chaouch, Salvatore Serrano, Marco Scarpa, "Application-Programming Interface (API) for Song Recognition Systems", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 846–859, 2021. doi: 10.25046/aj060298
28. Athanasios Tziouvaras, Georgios Dimitriou, Michael Dossis, Georgios Stamoulis, "Frequency Scaling for High Performance of Low-End Pipelined Processors", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 763–775, 2021. doi: 10.25046/aj060288
29. Mochammad Haldi Widianto, Ari Purno Wahyu, Dadan Gusna, "Prototype Design Internet of Things Based Waste Management Using Image Processing", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 2, pp. 709–715, 2021. doi: 10.25046/aj060282
30. 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
31. 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
32. Rajani Narayan, Anjanappa Sreenivasa Murthy, "Texture Based Image Retrieval Using Semivariogram and Various Distance Measures", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 1369–1377, 2021. doi: 10.25046/aj0601156
33. Shahenaz S. Abou Emira, Khaled Y. Youssef, Mohamed Abouelatta, "Simulated IoT Based Sustainable Power System for Smart Agriculture Environments", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 1030–1039, 2021. doi: 10.25046/aj0601114
34. Ademola Abdulkareem, Divine Ogbe, Tobiloba Somefun, Felix Agbetuyi, "Optimal PMU Placement Using Genetic Algorithm for 330kV 52-Bus Nigerian Network", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 597–604, 2021. doi: 10.25046/aj060164
35. Amin S. Ibrahim, Khaled Y Youssef, Mohamed Abouelatta, "Traffic Aggregation Techniques for Optimizing IoT Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 509–518, 2021. doi: 10.25046/aj060156
36. Fang-Lin Chao, Wei Zhong Feng, Kaiquan Shi, "Smart Collar and Chest Strap Design for Rescue Dog through Multidisciplinary Approach", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 386–392, 2021. doi: 10.25046/aj060144
37. Zainatul Yushaniza Mohamed Yusoff, Mohamad Khairi Ishak, Kamal Ali Alezabi, "The Role of RFID in Green IoT: A Survey on Technologies, Challenges and a Way Forward", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 17–35, 2021. doi: 10.25046/aj060103
38. Abdellatif Elouali, Smail Hafidi Alaoui, Noura Ettahir, Abderrazzak Khohmimidi, Nadia Motii, Keltoum Rahali, Mustapha Kouzer, "Touristic’s Destination Brand Image: Proposition of a Measurement Scale for Rabat City (Morocco)", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1750–1758, 2020. doi: 10.25046/aj0506209
39. Shahenda S. Abou Emira, Khaled Y. Youssef, Mohamed Abouelatta, "Design of Power Efficient Routing Protocol for Smart Livestock Farm Applications", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1719–1726, 2020. doi: 10.25046/aj0506205
40. Afsah Sharmin, Farhat Anwar, S M A Motakabber, "Efficient and Scalable Ant Colony Optimization based WSN Routing Protocol for IoT", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1710–1718, 2020. doi: 10.25046/aj0506204
41. Hasan Tariq, Abderrazak Abdaoui, Farid Touati, Mohammad Abdullah Al Hitmi, Damiano Crescini, Adel Ben Mnaouer, "Real-time Gradient-Aware Indigenous AQI Estimation IoT Platform", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1666–1673, 2020. doi: 10.25046/aj0506198
42. Nesma N. Gomaa, Khaled Y. Youssef, Mohamed Abouelatta, "On Design of IoT-based Power Quality Oriented Grids for Industrial Sector", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1634–1642, 2020. doi: 10.25046/aj0506194
43. Ryosuke Sakakibara, Yasuhiro Shindo, Kazuo Kato, Pak Kon Choi, Akira Takeuchi, "Basic Study of 3-D Non-Invasive Measurement of Temperature Distribution using Ultrasound Images during HIFU Heating", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1306–1311, 2020. doi: 10.25046/aj0506155
44. Ademola Abdulkareem, Divine Ogbe, Tobiloba Somefun, "Review of Different Methods for Optimal Placement of Phasor Measurement Unit on the Power System Network", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1071–1081, 2020. doi: 10.25046/aj0506130
45. Dang Xuan Ba, "A Fast Adaptive Time-delay-estimation Sliding Mode Controller for Robot Manipulators", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 904–911, 2020. doi: 10.25046/aj0506107
46. Mohammed Hadwan, Rehan Uallah Khan, Khalil Ibrahim Mohammad Abuzanouneh, "Towards a Smart Campus for Qassim University: An Investigation of Indoor Navigation System", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 831–837, 2020. doi: 10.25046/aj050699
47. Alan Guadalupe Ochoa Navarro, Juan De Dios Cota Apodaca, Dario Fuentes Guevara, "Strategic Plan for the Achievement of the Competitiveness of Small Companies with Respect to Large Ones", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 584–587, 2020. doi: 10.25046/aj050671
48. Felix Fernandez-Pena, Alex Maigua-Quinteros, Pilar Urrutia-Urrutia, Diana Coello-Fiallos, "Ontology-based Data Management Tool for Studying Radon Concentration", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 577–583, 2020. doi: 10.25046/aj050670
49. 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
50. Yevhen Fediv, Olha Sivakova, Mykhailo Korchak, "Multi Operated Virtual Power Plant in Smart Grid", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 256–260, 2020. doi: 10.25046/aj050630
51. Takuya Sarugaku, Jun Lee, Yasuaki Matsumoto, Mitsuho Yamada, "Examination of a Skill Sampling Method of an Athlete Using the Athlete’s Movement and Eye Movement for the Development of an AI Coach", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 1204–1213, 2020. doi: 10.25046/aj0505146
52. Lincan Li, Chiew Foong Kwong, Qianyu Liu, "A Proactive Mobile Edge Cache Policy Based on the Prediction by Partial Matching", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 1154–1161, 2020. doi: 10.25046/aj0505140
53. Basavaraj Rabakavi, Saroja V Siddamal, "Design and Implementation of Quad-Site Testing on FPGA Platform", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 789–798, 2020. doi: 10.25046/aj050596
54. Tri Nhut Do, Quang Minh Pham, Hoa Binh Le-Nguyen, Cao Tri Nguyen, Hai Minh Nguyen-Tran, "Development of a Wireless Displacement Estimation System Using IMU-based Device", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 781–788, 2020. doi: 10.25046/aj050595
55. Muhammad Usman Ali Khan, Raad Raad, Javad Foroughi, "Transient Response & Electromagnetic Behaviour of Flexible Bow-Tie Shaped Chip-less RFID Tag for General IoT Applications", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 757–764, 2020. doi: 10.25046/aj050592
56. Mimi Mohaffyza Mohamad, Alias Masek, Jailani Md Yunos, Maizam Alias, Nor Hidayah Hamdan, Andika Bagus Nur Rahma Putra, "Assessing Heutagogical Elements in Learning of Engineering Education: Instrument Validation", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 5, pp. 245–252, 2020. doi: 10.25046/aj050530
57. Marwa Boumaiz, Mohammed El Ghazi, Mohammed Fattah, Anas Bouayad, Moulhime El Bekkali, "The Effects of Transmission Power and Modulation Schemes on the Performance of WBANs in on-Body Medical Applications", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 783–794, 2020. doi: 10.25046/aj050493
58. Young-Jin Park, Hui-Sup Cho, "A Method for Detecting Human Presence and Movement Using Impulse Radar", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 770–775, 2020. doi: 10.25046/aj050491
59. Deepti Sehrawat, Nasib Singh Gill, "IoT Based Human Activity Recognition System Using Smart Sensors", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 516–522, 2020. doi: 10.25046/aj050461
60. Sarun Duangsuwan, Chakree Teekapakvisit, Myo Myint Maw, "Development of Soil Moisture Monitoring by using IoT and UAV-SC for Smart Farming Application", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 381–387, 2020. doi: 10.25046/aj050444
61. Olayan Alharbi, "Industry 4.0 Operators: Core Knowledge and Skills", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 177–183, 2020. doi: 10.25046/aj050421
62. Kanishk Rai, Keshav Kumar Thakur, Preethi K Mane, Narayan Panigrahi, "Design of an EEG Acquisition System for Embedded Edge Computing", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 4, pp. 119–129, 2020. doi: 10.25046/aj050416
63. Maximo Giovani Tanzado Espinoza, Joseline Roxana Neira Melendrez, Luis Antonio Neira Clemente, "A Survey and an IoT Cybersecurity Recommendation for Public and Private Hospitals in Ecuador", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 518–528, 2020. doi: 10.25046/aj050364
64. Reda El Abbadi, Hicham Jamouli, "Trajectory Tracking Control of a DC Motor Exposed to a Replay-Attack", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 264–269, 2020. doi: 10.25046/aj050334
65. Andry Alamsyah, Sri Widiyanesti, Rizqy Dwi Putra, Puspita Kencana Sari, "Personality Measurement Design for Ontology Based Platform using Social Media Text", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 100–107, 2020. doi: 10.25046/aj050313
66. Tan Ming Hui, Ahmad Yusairi Bani Hashim, "Evaluation of Uncertainty Measurement Calculation for Vector Network Analyzer From 300 kHz to 8.5 GHz", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 3, pp. 01–10, 2020. doi: 10.25046/aj050301
67. Rajesh Kannan Megalingam, Santosh Tantravahi, Hemanth Sai Surya Kumar Tammana, Nagasai Thokala, Hari Sudarshan Rahul Puram, Naveen Samudrala, "ROS Based Multimode Control of Wheeled Robot", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 688–696, 2020. doi: 10.25046/aj050285
68. Gede Indrawan, I Made Agus Oka Gunawan, Sariyasa, "The Usability Evaluation of Academic Progress Information System (SIsKA-NG)", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 460–468, 2020. doi: 10.25046/aj050259
69. ?ahin Aydin, Mehmet Nafiz Aydin, "A Sustainable Multi-layered Open Data Processing Model for Agriculture: IoT Based Case Study Using Semantic Web for Hazelnut Fields", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 2, pp. 309–319, 2020. doi: 10.25046/aj050241
70. 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
71. 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
72. Aref Hassan Kurd Ali, Halikul Lenando, Mohamad Alrfaay, Slim Chaoui, Haithem Ben Chikha, Akram Ajouli, "Performance Analysis of Routing Protocols in Resource-Constrained Opportunistic Networks", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 6, pp. 402–413, 2019. doi: 10.25046/aj040651
73. Samruan Wiangsamut, Phatthanaphong Chomphuwiset, Suchart Khummanee, "Chatting with Plants (Orchids) in Automated Smart Farming using IoT, Fuzzy Logic and Chatbot", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 5, pp. 163–173, 2019. doi: 10.25046/aj040522
74. Alghamdi Abdullah, Mohammed Thanoon, Anwar Alsulami, "Toward a Smart Campus Using IoT: Framework for Safety and Security System on a University Campus", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 5, pp. 97–103, 2019. doi: 10.25046/aj040512
75. Avid Roman-Gonzalez, Antony Ciriaco-Susanibar, Natalia I. Vargas-Cuentas, "Comparing the Scientific Production of Peruvian Universities with Equitable Indexes", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 394–403, 2019. doi: 10.25046/aj040448
76. Anang Hudaya Muhamad Amin, Nazrul Muhaimin Ahmad, Subarmaniam Kannan, "Event Monitoring using Distributed Pattern Recognition Approach on Integrated IoT-Blockchain Network", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 4, pp. 256–264, 2019. doi: 10.25046/aj040432
77. Tlija Amira, Istrate Dan, Badii Atta, Gattoufi Said, Bennani Az-eddine, Wegrzyn-Wolska Katarzyna, "Stress Level Classification Using Heart Rate Variability", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 3, pp. 38–46, 2019. doi: 10.25046/aj040306
78. Amir Rizaan Rahiman, Md. Ashikul Islam, Md. Noor Derahman, "Resourceful Residual Energy Consumption in TDMA Scheduling for IoT-based Wireless Sensor Network", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 3, pp. 31–37, 2019. doi: 10.25046/aj040305
79. Imtiaz Parvez, Arif I. Sarwat, "A Spectrum Sharing based Metering Infrastructure for Smart Grid Utilizing LTE and WiFi", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 2, pp. 70–77, 2019. doi: 10.25046/aj040209
80. Shruthi Narayanaswamy, Anitha Vijaya Kumar, "Application Layer Security Authentication Protocols for the Internet of Things: A Survey", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 317–328, 2019. doi: 10.25046/aj040131
81. Zifan Zhou, Michael Stübert Berger, Sarah Renée Ruepp, Ying Yan, "Insight into the IEEE 802.1 Qcr Asynchronous Traffic Shaping in Time Sensitive Network", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 292–301, 2019. doi: 10.25046/aj040128
82. Philipp Berlt, Lisa Jäger, Andreas Schwind, Frank Wollenschläger, Christian Bornkessel, Matthias A. Hein, "Over-The-Air Testing of Automotive Antennas and Wireless Links in The Installed State on The Basis of LTE Downlink Communication Parameters", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 1, pp. 282–291, 2019. doi: 10.25046/aj040127
83. 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
84. 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
85. Kun Zhang, Liu Liu, Cheng Tao, Ke Zhang, Ze Yuan, Jianhua Zhang, "Wireless Channel Measurement and Modeling in Industrial Environments", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 4, pp. 254–259, 2018. doi: 10.25046/aj030425
86. Vittorio Miori, Dario Russo, Luca Ferrucci, "Supporting Active Aging Through A Home Automation Infrastructure for Social Internet of Things", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 4, pp. 173–186, 2018. doi: 10.25046/aj030415
87. Moises Levy, Daniel Raviv, "An Overview of Data Center Metrics and a Novel Approach for a New Family of Metrics", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 2, pp. 238–251, 2018. doi: 10.25046/aj030228
88. Ahlem Sassi, Michel Zasadzinksi, Harouna Souley Ali, Kamel Abderrahim, "Adaptive observer design for a class of nonlinear systems with time delays", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 1, pp. 373–383, 2018. doi: 10.25046/aj030146
89. Ajay Poonjal Pai, Tomas Reiter, Oleg Vodyakho, Martin Maerz, "Mission Profile Analysis of a SiC Hybrid Module for Automotive Traction Inverters and its Experimental Power-loss Validation with Electrical and Calorimetric Methods", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 1, pp. 329–341, 2018. doi: 10.25046/aj030140
90. Cyrille Caironi, Bernhard Fruth, Detlef Hummes, Rudolf Blank, "Influence of supply frequency on dissipation factor measurement and stator insulation diagnosis", Advances in Science, Technology and Engineering Systems Journal, vol. 3, no. 1, pp. 155–159, 2018. doi: 10.25046/aj030119
91. Oleksandr Poliarus, Yevhen Poliakov, Andrii Lebedynskyi, Viktor Ivanov, Ruslan Pashchenko, "Measurement of the Bridge Surface Deflections Using Near-Field Amplitude of Secondary Radiators System", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 6, pp. 217–224, 2017. doi: 10.25046/aj020626
92. Zoltan Sarkany, Marta Rencz, "A Way for Measuring the Temperature Transients of Capacitors", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 1381–1389, 2017. doi: 10.25046/aj0203174
93. Davar Pishva, "IoT: Their Conveniences, Security Challenges and Possible Solutions", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 1211–1217, 2017. doi: 10.25046/aj0203153
94. Stefania Nanni, Elisa Benetti, Gianluca Mazzini, "Indoor monitoring in Public Buildings: workplace wellbeing and energy consumptions. An example of IoT for smart cities application", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 884–890, 2017. doi: 10.25046/aj0203110
95. Muftah Fraifer, Mikael Fernström, "Designing a Smart Car Parking System (PoC) Prototype Utilizing CCTV Nodes: A vision of an IoT parking system via UCD process", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 755–764, 2017. doi: 10.25046/aj020396
96. Fatma Abdelhedi, Nabil Derbel, "A delay-dependent distributed SMC for stabilization of a networked robotic system exposed to external disturbances", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 513–519, 2017. doi: 10.25046/aj020366
97. Kassem Jomaa, Fabien Ndagijimana, Hussam Ayad, Majida Fadlallah, Jalal Jomaah, "RFID Antenna Near-field Characterization Using a New 3D Magnetic Field Probe", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 492–497, 2017. doi: 10.25046/aj020363
98. Marwa Fathallah, Fatma Abdelhedi, Nabil Derbel, "A synchronizing second order sliding mode control applied to decentralized time delayed multi-agent robotic systems: Stability Proof", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 160–170, 2017. doi: 10.25046/aj020321
99. Arsen Klochan, Ali Al-Ammouri, Viktor Romanenko, Vladimir Tronko, "Aviation Navigation with Use of Polarimetric Technologies", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 67–72, 2017. doi: 10.25046/aj020310
100. Martín, María de los Ángeles, Diván, Mario José, "Applications of Case Based Organizational Memory Supported by the PAbMM Architecture", Advances in Science, Technology and Engineering Systems Journal, vol. 2, no. 3, pp. 12–23, 2017. doi: 10.25046/aj020303