Pub Date : 2022-01-27DOI: 10.31130/ict-ud.2021.148
Tran Anh Kiet, Dang Thien Binh, Dang Hoai Phuong, H. Hieu, V. T. Hung
Energy reduction for sireless sensor networks (WSNs) is considered in many works. Sensor scheduling for data collection where the sensors in a WSN are set to wake-up and sleeping mode is a promising candidate. Unmanned aerial vehicle (UAV) utilizing the mobility is investigated to support the data collection for WSNs. This paper proposes a novel system and timing model where a UAV flies to hover at sensors and collect the sensed data. Therefore, a design problem for operationtime minimization is established as a combination problem. To overcome the challenge, we propose a heuristic search method to find the trajectory of UAV. The numerical results demonstrate that the proposed method outperforms the random one.
{"title":"Joint UAV Trajectory and Data Demand for Scheduling in Wireless Sensor Networks","authors":"Tran Anh Kiet, Dang Thien Binh, Dang Hoai Phuong, H. Hieu, V. T. Hung","doi":"10.31130/ict-ud.2021.148","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.148","url":null,"abstract":"Energy reduction for sireless sensor networks (WSNs) is considered in many works. Sensor scheduling for data collection where the sensors in a WSN are set to wake-up and sleeping mode is a promising candidate. Unmanned aerial vehicle (UAV) utilizing the mobility is investigated to support the data collection for WSNs. This paper proposes a novel system and timing model where a UAV flies to hover at sensors and collect the sensed data. Therefore, a design problem for operationtime minimization is established as a combination problem. To overcome the challenge, we propose a heuristic search method to find the trajectory of UAV. The numerical results demonstrate that the proposed method outperforms the random one.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116859482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-26DOI: 10.31130/ict-ud.2021.145
Nam Linh Nguyen
In this work, we fabricated and measured a bilayer MoS2 devices based on nanopore structure. The bilayer MoS2 films were synthesized and placed on top of the nanopore. The gold metal is then evaporated and contacted to top and bottom of MoS2 film to form electrodes for electronic measurement. The asymmetric Au/MoS2/Au devices exhibit current-voltage rectification which is attributed to photovoltaic properties. The photo-response of a nanopore based bilayer MoS2 devices is investigated which shows short circuit current as well as open circuit voltage under illumination. It is also found that the photogain of devices is calculated in the range of 105 and switching behavior with light is stable and reproducible. These characteristics make atomic layered MoS2 device to be great potential for application in electronics and optoelectronics.
{"title":"Photovoltaic effect in nanopore based bilayer MoS2 devices","authors":"Nam Linh Nguyen","doi":"10.31130/ict-ud.2021.145","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.145","url":null,"abstract":"In this work, we fabricated and measured a bilayer MoS2 devices based on nanopore structure. The bilayer MoS2 films were synthesized and placed on top of the nanopore. The gold metal is then evaporated and contacted to top and bottom of MoS2 film to form electrodes for electronic measurement. The asymmetric Au/MoS2/Au devices exhibit current-voltage rectification which is attributed to photovoltaic properties. The photo-response of a nanopore based bilayer MoS2 devices is investigated which shows short circuit current as well as open circuit voltage under illumination. It is also found that the photogain of devices is calculated in the range of 105 and switching behavior with light is stable and reproducible. These characteristics make atomic layered MoS2 device to be great potential for application in electronics and optoelectronics.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123095890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-26DOI: 10.31130/ict-ud.2021.132
Tu V. Nguyen, H. Nguyen, D. Nguyen, Tuan Dao, Son The Tran, T. Nguyen
In this paper, we propose a model of subcarrier multiplexing millimeter wave radio-over-fiber SCM/MMW/RoF optical-wireless access system for next generation mobile communications using QPSK modulation. We then calculate signal and total noise power at the end of optical fiber link and at mobile subscribers through wireless medium. Next, system performance showed by SNR, BER at the end of system is determined. They are investigated, compared, evaluated by Matlab in many different scenarios including BER performance versus EDFA’s Gain, optical transmitter power at central office (CO), optical oscillator power in coherent receiver, wireless frequencies, wireless link distance corresponding to two wireless cases of Line of Sight (LoS) and Non Line of Sight (NLoS). Numerical results show that when number of SCM channels increase system performance becomes worse due to nonlinear effect in SCM modulation.
{"title":"Investigating the Performance of SCM/MMW/RoF Optical-Wireless Access System for Next Generation Communications","authors":"Tu V. Nguyen, H. Nguyen, D. Nguyen, Tuan Dao, Son The Tran, T. Nguyen","doi":"10.31130/ict-ud.2021.132","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.132","url":null,"abstract":"In this paper, we propose a model of subcarrier multiplexing millimeter wave radio-over-fiber SCM/MMW/RoF optical-wireless access system for next generation mobile communications using QPSK modulation. We then calculate signal and total noise power at the end of optical fiber link and at mobile subscribers through wireless medium. Next, system performance showed by SNR, BER at the end of system is determined. They are investigated, compared, evaluated by Matlab in many different scenarios including BER performance versus EDFA’s Gain, optical transmitter power at central office (CO), optical oscillator power in coherent receiver, wireless frequencies, wireless link distance corresponding to two wireless cases of Line of Sight (LoS) and Non Line of Sight (NLoS). Numerical results show that when number of SCM channels increase system performance becomes worse due to nonlinear effect in SCM modulation.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"735 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126348142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, we design a tracking bracelet device for kids with novel function that can detect in real-time whether the device is still attached or not. The novel function in combined with setting of a safe zone yields an absolute tracking of thekid safety. A prototype is implemented achieving a small size of 60 x 60 x 25 mm. The test results demonstrate that the proposed device works very well with 100 % of exact warning when the kids are assumed in danger. Moreover, thanks to alow power consumption of about 64 mW in average, the device is expected to work continuously at least 18 hours.
在本文中，我们设计了一款儿童追踪手环设备，具有新颖的功能，可以实时检测设备是否还在连接。新功能与安全区域的设置相结合，可以对孩子的安全进行绝对跟踪。实现了60 x 60 x 25 mm的小尺寸原型。测试结果表明，当孩子们处于危险中时，该装置可以100%准确地发出警告。此外，由于平均功耗约为64兆瓦，该设备预计可连续工作至少18小时。
{"title":"A Tracking Bracelet Device for Kids with Detachment Warning Function","authors":"Thuy Nhien Nguyen, Dinh Thien Quang Tran, Huynh Nguyen, Minh Vo","doi":"10.31130/ict-ud.2021.136","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.136","url":null,"abstract":"In this paper, we design a tracking bracelet device for kids with novel function that can detect in real-time whether the device is still attached or not. The novel function in combined with setting of a safe zone yields an absolute tracking of thekid safety. A prototype is implemented achieving a small size of 60 x 60 x 25 mm. The test results demonstrate that the proposed device works very well with 100 % of exact warning when the kids are assumed in danger. Moreover, thanks to alow power consumption of about 64 mW in average, the device is expected to work continuously at least 18 hours.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125573710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-25DOI: 10.31130/ict-ud.2021.146
Quang Minh Duong, T. Le, A. H. Pham, Dinh Thanh Viet, K. H. Le
Due to the increasing load demand, integrating renewable energy into the power system to satisfy the electrical consumption is the trend to develop the modern power system. However, the uncertainty of renewable energy sources affects the energy transmission efficiency and the reliability of power systems. To get this under control, connecting storage systems such as pump-storage hydroelectricity is seen to be an efficient solution. In this paper, Python language is used to describe input data and model the Vietnamese power system. The results show the feasibility of the hydro-storage model in improving the power system performance when renewable energy sources are involved.
{"title":"Improving transmission network using renewable resources efficiency by integrating pumped-storage hydroelectricity","authors":"Quang Minh Duong, T. Le, A. H. Pham, Dinh Thanh Viet, K. H. Le","doi":"10.31130/ict-ud.2021.146","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.146","url":null,"abstract":"Due to the increasing load demand, integrating renewable energy into the power system to satisfy the electrical consumption is the trend to develop the modern power system. However, the uncertainty of renewable energy sources affects the energy transmission efficiency and the reliability of power systems. To get this under control, connecting storage systems such as pump-storage hydroelectricity is seen to be an efficient solution. In this paper, Python language is used to describe input data and model the Vietnamese power system. The results show the feasibility of the hydro-storage model in improving the power system performance when renewable energy sources are involved.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133873742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-25DOI: 10.31130/ict-ud.2021.137
M. Vo
In this paper, we analyze for the first time behavior in the time domain of the accumulated quantization error induced by the first- and second-order digital DeltaSigma modulator (DSM). The DSM is adopted in fractional-N PLLs to dither frequency division factor. From the analysis, difference in behavior of the accumulated quantization error in the two cases is clearly explained. Furthermore, by mean of this, the reason of using second-order DSM is required for the calibration loop of digital/time converter canceling the quantization error is revealed. It also explains why there is variation in convergence time even with the second-order DSM when fractional part of the division factor changes.
{"title":"Analysis of First- and Second-Order Digital DS Modulator Used in Fractional-N PLLs","authors":"M. Vo","doi":"10.31130/ict-ud.2021.137","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.137","url":null,"abstract":"In this paper, we analyze for the first time behavior in the time domain of the accumulated quantization error induced by the first- and second-order digital DeltaSigma modulator (DSM). The DSM is adopted in fractional-N PLLs to dither frequency division factor. From the analysis, difference in behavior of the accumulated quantization error in the two cases is clearly explained. Furthermore, by mean of this, the reason of using second-order DSM is required for the calibration loop of digital/time converter canceling the quantization error is revealed. It also explains why there is variation in convergence time even with the second-order DSM when fractional part of the division factor changes.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114387000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-25DOI: 10.31130/ict-ud.2021.139
D. Truong, M.-S. Nguyen Thi, V. Ngo, A. Hoang
For monitoring the energy supply from the hybrid small-scale wind turbine generator (WTG) and rooftop solar Photovoltage (PV) systems, this paper presents the design of a management program of the studied system based on the Internet of Things (IoT) technology. The proposed studied system consists of digital power meters that communicate wirelessly to the Programmable Logic Controller (PLC) through the ZigBee communication standard. By using a free cloud platform will greatly facilitate the Supervisory Control and Data Acquisition (SCADA) interface design work for a Human Machine Interface (HMI) or mobile phone. This system configuration may be easy to be fitted for collecting electrical information such as voltage, current, power, frequency of the system to be monitored. This is one of the cheap solutions deployed in small-scale hybrid power systems (HPS) or factories because wireless communication is very convenient in construction and installation.
{"title":"Development of the Monitoring Program for an Integrated Small-Scale Wind and Solar Systems based on IoT Technology","authors":"D. Truong, M.-S. Nguyen Thi, V. Ngo, A. Hoang","doi":"10.31130/ict-ud.2021.139","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.139","url":null,"abstract":"For monitoring the energy supply from the hybrid small-scale wind turbine generator (WTG) and rooftop solar Photovoltage (PV) systems, this paper presents the design of a management program of the studied system based on the Internet of Things (IoT) technology. The proposed studied system consists of digital power meters that communicate wirelessly to the Programmable Logic Controller (PLC) through the ZigBee communication standard. By using a free cloud platform will greatly facilitate the Supervisory Control and Data Acquisition (SCADA) interface design work for a Human Machine Interface (HMI) or mobile phone. This system configuration may be easy to be fitted for collecting electrical information such as voltage, current, power, frequency of the system to be monitored. This is one of the cheap solutions deployed in small-scale hybrid power systems (HPS) or factories because wireless communication is very convenient in construction and installation.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122286051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-25DOI: 10.31130/ict-ud.2021.140
D. Pham, Minh-Tan Nguyen, Ha-Nam Nguyen, Tien-Dzung Tran
Data-clustering tools can be employed to generate new knowledge for the diagnosis and treatment of cancer. However, traditional clustering methods, such as the K-mean approach, often require the determination of input parameters such as the cluster number and initial centers to be viable. In this study, we present a network science-based clustering method with fewer parameters that were used to mine a cancer-screening dataset containing over 177,000 records. We propose an algorithm that computes the similarity between pairs of records to create a complex network in which each node represents a record, and two nodes are connected by an edge if their similarity is greater than a given threshold as determined by experimental observation. Based on the network created, we employed the network modularity optimization algorithm to detect modules (clusters) within it. Each cluster contains records that are similar to one another in terms of some attributes; therefore, we could derive rules from the cluster for insights into the cancer situation in Vietnam. These rules reveal that some cancer types are more widespread in specific families and living environments in Vietnam. Clustering data based on network science can therefore be a good option for large-scale relational data-mining problems in the future.
{"title":"Analyzing cancer data in North Vietnam by complex network technique","authors":"D. Pham, Minh-Tan Nguyen, Ha-Nam Nguyen, Tien-Dzung Tran","doi":"10.31130/ict-ud.2021.140","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.140","url":null,"abstract":"Data-clustering tools can be employed to generate new knowledge for the diagnosis and treatment of cancer. However, traditional clustering methods, such as the K-mean approach, often require the determination of input parameters such as the cluster number and initial centers to be viable. In this study, we present a network science-based clustering method with fewer parameters that were used to mine a cancer-screening dataset containing over 177,000 records. We propose an algorithm that computes the similarity between pairs of records to create a complex network in which each node represents a record, and two nodes are connected by an edge if their similarity is greater than a given threshold as determined by experimental observation. Based on the network created, we employed the network modularity optimization algorithm to detect modules (clusters) within it. Each cluster contains records that are similar to one another in terms of some attributes; therefore, we could derive rules from the cluster for insights into the cancer situation in Vietnam. These rules reveal that some cancer types are more widespread in specific families and living environments in Vietnam. Clustering data based on network science can therefore be a good option for large-scale relational data-mining problems in the future.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114592101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-31DOI: 10.31130/ict-ud.2021.150
Bui Minh Dinh, Dinh Hai Linh
This paper presents electromagnetic design and analysis of an interior and surface mounted and permanentmagnet BLDC motor for independent four-wheel drives. The designed motors of 25kWIPM
{"title":"Interrior and Surface Mounted Permanent Magnet BLDC Motor for Inwheel Electric Vehicles","authors":"Bui Minh Dinh, Dinh Hai Linh","doi":"10.31130/ict-ud.2021.150","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.150","url":null,"abstract":"This paper presents electromagnetic design and analysis of an interior and surface mounted and permanentmagnet BLDC motor for independent four-wheel drives. The designed motors of 25kWIPM","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131901888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-29DOI: 10.31130/ict-ud.2021.118
Cuiping Long, Ha Quoc Trung, T. N. Thang, Nguyen Tien Dong, Pham Van Hai
Digital transformation is a long process that changes the managing human profiles in both offline and online approaches. This generates the amount of huge data stored in both relational databases and many others like social networks or graph databases. To exploit effectively big data, several measures and algorithms in Picture Fuzzy Graph (PFG) are applied to solve many complex problems in the real-world problems. The paper has presented a novel approach using a knowledge graph to find a human profile including the detection of humans in large data. In the proposed model, digital human profiles are collected from conventional databases combination with social networks in real-time, and a knowledge graph is created to represent complex-relational user attributes of human profile in large datasets. PFG is applied to quantify the degree centrality of nodes. Furthermore, techniques and algorithms on the graph are used to classify the nodes. The experiments in the knowledge graph implemented to illustrate the proposed model. The main contribution in this paper is to identify the right persons among complex-relational groups, locations in real-time based on large datasets on the social networks, relational databases and graph databases.
{"title":"A Knowledge Graph Approach for the Detection of Digital Human Profiles in Big Data","authors":"Cuiping Long, Ha Quoc Trung, T. N. Thang, Nguyen Tien Dong, Pham Van Hai","doi":"10.31130/ict-ud.2021.118","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.118","url":null,"abstract":"Digital transformation is a long process that changes the managing human profiles in both offline and online approaches. This generates the amount of huge data stored in both relational databases and many others like social networks or graph databases. To exploit effectively big data, several measures and algorithms in Picture Fuzzy Graph (PFG) are applied to solve many complex problems in the real-world problems. The paper has presented a novel approach using a knowledge graph to find a human profile including the detection of humans in large data. In the proposed model, digital human profiles are collected from conventional databases combination with social networks in real-time, and a knowledge graph is created to represent complex-relational user attributes of human profile in large datasets. PFG is applied to quantify the degree centrality of nodes. Furthermore, techniques and algorithms on the graph are used to classify the nodes. The experiments in the knowledge graph implemented to illustrate the proposed model. The main contribution in this paper is to identify the right persons among complex-relational groups, locations in real-time based on large datasets on the social networks, relational databases and graph databases.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127803303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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