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Investigation of Ber Performances in Chaotic-Secured Optical Fiber Communication Systems using the 4-PAM Modulation Scheme 采用4-PAM调制方案的混沌保密光纤通信系统Ber性能研究
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.126
Vu Anh Dao, Tran Thi Thuy, Truong Cao Dung, N. X. Quyen
{"title":"Investigation of Ber Performances in Chaotic-Secured Optical Fiber Communication Systems using the 4-PAM Modulation Scheme","authors":"Vu Anh Dao, Tran Thi Thuy, Truong Cao Dung, N. X. Quyen","doi":"10.31130/ict-ud.2021.126","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.126","url":null,"abstract":"This paper presents a numerical simulation investigation on the bit error rate in a chaotic-secured fiber channel and a conventional fiber channel when propagating independently. The investigated communication system uses the pulse-amplitude modulation scheme (4-PAM) at the bit rate of 10 Gbps, the fiber length of 100 km, and the operation wavelength of 1550 nm. Our simulation results demonstrate both chaotic and non-chaotic transmission channels can well operate with the bit rate up to 20 Gbps with the BER smaller than 10-5 if dispersion and fiber loss issues are appropriately compensated without needing forwarderror-correction, showing high potential in physically secured optical fiber communication systems.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"21 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":"122581009","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}
引用次数: 0
Design of Silicon TE0/TE1 Mode Router Using Mach-Zehnder and Multimode Interferometers 基于Mach-Zehnder和多模干涉仪的硅TE0/TE1模式路由器设计
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.128
Tran Xuan Hop, Dang Thi Nuong, Ho Duc Tam Linh, Duong Quang Duy, N. T. H. Yen, Mai Thi Phuong Le, Truong Cao Dung, N. Hung
{"title":"Design of Silicon TE0/TE1 Mode Router Using Mach-Zehnder and Multimode Interferometers","authors":"Tran Xuan Hop, Dang Thi Nuong, Ho Duc Tam Linh, Duong Quang Duy, N. T. H. Yen, Mai Thi Phuong Le, Truong Cao Dung, N. Hung","doi":"10.31130/ict-ud.2021.128","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.128","url":null,"abstract":"\u0000 \u0000 \u0000This paper proposes a new design of two-mode three-port optical mode router for mode division multiplexing systems. The device consists of a Mach-Zehnder interferometer (MZI) and a multimode interferometer (MMI), which utilizes silicon material for photonic integrated circuits (PIC). By setting appropriate values for the two butterfly-shaped phase shifters (PSs) at MZI and MMI, the input mode, either transverse electric (TE) modes TE0 or TE1, can be routed to the desired output among the three output ports. The device is designed and optimized via three-dimensional beam propagation method (3D BPM). The proposed device achieves very low insertion loss and small cross-talk, which are less than 0.4 dB and -24.5 dB, respectively, over the whole C band. \u0000 \u0000 \u0000","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"1 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":"129206797","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}
引用次数: 1
Effects of Temperature and Stress on the InGaP/GaAs Heterojunction Phototransistor 温度和应力对InGaP/GaAs异质结光电晶体管的影响
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.112
Phuc Hong Than, Tran Thi Tra Vinh, L. Hạnh, Than Quang Tho, N. V. A. Quang, Tran The Son
{"title":"Effects of Temperature and Stress on the InGaP/GaAs Heterojunction Phototransistor","authors":"Phuc Hong Than, Tran Thi Tra Vinh, L. Hạnh, Than Quang Tho, N. V. A. Quang, Tran The Son","doi":"10.31130/ict-ud.2021.112","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.112","url":null,"abstract":"Although the effects of electrical stress and temperature on the performance of the InGaP/GaAs heterojunction bipolar transistors (HBTs) have been widely studied and reported, little or none was reported for the InGaP/GaAs heterojunction phototransistors (HPTs) in the literature. In this paper, we discuss the temperature-dependent characteristic of InGaP/GaAs HPTs before and after electrical stress and assess the effectiveness of the emitter-ledge passivation, which was found to effectively keep the InGaP/GaAs HBTs from degrading at higher temperature or after an electrical stress. The emitter-ledge passivation is also effective keeping a higher optical gain even at higher temperature. An electrical stress was given to the HPTs by keeping the collector current at 60 mA for 15 min. Since the collector current density as an electrical stress is 24 A/cm2 and much smaller than the stress usually given to smaller HBTs for the stress test, the decreased optical gain was not observed when it was given at room temperature. However, when it was given at 420 K, significant decreases of the current gain and optical gain were observed at any temperature. Nevertheless, the emitter-ledge passivation was found effective in minimizing the decreases of the current gain and optical gain.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"106 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":"116284996","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}
引用次数: 0
Accelerometer-Based Model Acquiring Data on Sleep Apnea Symptoms 基于加速计的模型获取睡眠呼吸暂停症状数据
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.130
Vu Minh Tuan, Le-Tien Thuong
{"title":"Accelerometer-Based Model Acquiring Data on Sleep Apnea Symptoms","authors":"Vu Minh Tuan, Le-Tien Thuong","doi":"10.31130/ict-ud.2021.130","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.130","url":null,"abstract":"Obstructive sleep apnea (OSA) is a common middle-aged sleep disorder, especially in the elderly. Nonetheless, people with experience sleep apnea often undiagnosed and completed treatment because the method performs in hospitals and medical centers with special medical equipment supervised by the medical team all night long. In this paper, we proposed to build a data collection system on sleep apnea, using our proposed device with the criterion of compact size, low cost, and easy implementation at home. This device measures the common carotid artery (CCA) and internal jugular vein (IJV) movements in the patient's neck with an accelerometer that is fixed by an electrode patch. The signal received from the sensor will be sent to the system through an Internet connection to store and create a data set about OSA for monitoring and later detection purposes.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"134 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":"132572113","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}
引用次数: 0
Waldschmidt constant of certain sets of points with 3 supporting lines in projective plane 投影平面上具有3条支撑线的若干点集的Waldschmidt常数
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.127
T. Nguyen, Dang Tuan Hiep
{"title":"Waldschmidt constant of certain sets of points with 3 supporting lines in projective plane","authors":"T. Nguyen, Dang Tuan Hiep","doi":"10.31130/ict-ud.2021.127","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.127","url":null,"abstract":"The paper shows values of the initial degree and Waldschmidt constant for some special cases including severalcases of ten points with three supporting lines in projective plane. These constants represent the complexity of optimal solutions in repeated path problems that have many applications in computer science, informatics theory and telecommunications.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"111 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":"124737601","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}
引用次数: 1
Performance of Dynamic Optical Path Networks with Large-scale WBSS-based Optical Cross-connects 基于wbss的大规模光交叉连接动态光路网络性能研究
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.124
Hai-Chau Le, Anh-Ngoc Le, Thien Pham, Thanh Hai Dao
{"title":"Performance of Dynamic Optical Path Networks with Large-scale WBSS-based Optical Cross-connects","authors":"Hai-Chau Le, Anh-Ngoc Le, Thien Pham, Thanh Hai Dao","doi":"10.31130/ict-ud.2021.124","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.124","url":null,"abstract":"In this paper, we have proposed a generalized large-scale optical cross-connect (OXC) architecture utilizing waveband selective switches (WBSS) for realizing future cost-effective, bandwidth-abundant and flexible optical networks. The developed architecture implements multiple WBSSs for each incoming fiber and small size wavelength selective switches (WSSs) for dropping optical paths while simply deploying 1´2 WSSs or 1´2 optical couplers for realizing the adding function. Thanks to the use of WBSSs, which are more cost-effective and simpler devices, the developed architecture enables a significant hardware scale reduction. The WBSS-based OXC, however, suffers from a limited routing capability, which relies on the inner node parameter (i.e., the WBSS number per input fiber) and the waveband granularity of WBSSs. We, therefore, evaluate the hardware scale requirement of our developed architecture in comparison with that of conventional WSS-based OXC. It is verified that a substantial hardware scale reduction can be achieved by using the proposed architecture, especially for high port count OXCs or when applying coarser granular WBSSs. Moreover, we also assess the performance of dynamic optical networks based on the proposed OXC. Numerical simulations show that the network offers a substantial necessary hardware scale reduction at the cost of a small performance offset comparing to that of the network using conventional WSS-based OXC.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"30 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":"114638078","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}
引用次数: 0
On efficient designing of protograph LDPC codes 原型LDPC码的高效设计
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.131
H. Nguyen, N. Pham, Thu Phuong Nguyen, C. D. Nguyen
{"title":"On efficient designing of protograph LDPC codes","authors":"H. Nguyen, N. Pham, Thu Phuong Nguyen, C. D. Nguyen","doi":"10.31130/ict-ud.2021.131","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.131","url":null,"abstract":"This paper designs two protograph LDPC codes with code-rate $R > 1/2$. A simple method using the protograph extrinsic information transfer (PEXIT) to design the codes with a low decoding threshold and the asymptotic weight enumerator (AWE) to evaluate the error floor of the codes is deployed. Simulation results show that the proposed codes have a better error floor than prior art protograph codes and offer higher rate protographs.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"3 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":"131695923","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}
引用次数: 0
A Compact Switched Beam Antenna Array for ISM Band 一种用于ISM波段的紧凑型开关波束天线阵列
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2021-06-29 DOI: 10.31130/ict-ud.2021.134
Trì Nguyễn, Bui Thi Duyen, Hoang Thi Phuong Thao
{"title":"A Compact Switched Beam Antenna Array for ISM Band","authors":"Trì Nguyễn, Bui Thi Duyen, Hoang Thi Phuong Thao","doi":"10.31130/ict-ud.2021.134","DOIUrl":"https://doi.org/10.31130/ict-ud.2021.134","url":null,"abstract":"This paper proposes the switched beam antenna array at the center frequency of 2.45GHz with a bandwidth of 187 MHz, from 2.32 GHz to 2.51 GHz. The phase shifter of antenna utilizes a 4×4 planar Butler matrix with phase differences between its outputs of  ±135° and ±45° to obtain four the different main beam directions. The proposed design is fully described including the patch antenna element, the antenna array, the phase shifter that forms the completed antenna array. The antenna array achieves a gain max up to 7 dBi, and the angles of the main beam directions of -41°, -12°, +15°, +48° in a horizontal plane. The beamwidth of the four main beams is from 26°  to 31.8° in E-plane and from 38.5° to 55.4° in H-plane. The advantage of the antenna is the planar structure and compact dimension of 200×230mm2. The proposed antenna is suitable for ISM band.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"26 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":"125184171","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}
引用次数: 1
Source Separation using Sparse NMF and Graph Regularization on Vietnamese Dataset 基于稀疏NMF和图正则化的越南语数据源分离
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2020-12-29 DOI: 10.31130/ICT-UD.2020.98
Tuan Q. Pham
{"title":"Source Separation using Sparse NMF and Graph Regularization on Vietnamese Dataset","authors":"Tuan Q. Pham","doi":"10.31130/ICT-UD.2020.98","DOIUrl":"https://doi.org/10.31130/ICT-UD.2020.98","url":null,"abstract":"Source separation is popular problem in which English datasets is used by default. Besides, source separation or speech enhancement is an important pre-processing step for following processes e.g. automatic speech recognition, automatic answering machine or hearing ads…However, experiments of source separation on Vietnamese dataset is quite modest as well as lack of Vietnamese standard datasets for source separation. To deal these issues, we build a Vietnamese dataset for source separation by collecting utterances of broadcasters from VTV’s official website. Moreover, a novel method was proposed by using sparse non-negative matrix factorization and graph regularization. Experiments showed that the proposed method is outperformed baseline.      ","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131508596","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}
引用次数: 0
Mutual Coupling Effect in Unequally - Spaced Linear Antenna Array Performance 非等间距线性天线阵列性能中的相互耦合效应
Journal of Science and Technology: Issue on Information and Communications Technology Pub Date : 2020-12-29 DOI: 10.31130/ICT-UD.2020.129
N. Binh, N. Dinh, Y. Yamada
{"title":"Mutual Coupling Effect in Unequally - Spaced Linear Antenna Array Performance","authors":"N. Binh, N. Dinh, Y. Yamada","doi":"10.31130/ICT-UD.2020.129","DOIUrl":"https://doi.org/10.31130/ICT-UD.2020.129","url":null,"abstract":"Unequally-spaced arrays can offer some advantages over equally-spaced arrays as follows: reducing the side-lobed level for the broadband array with an identical excitation coefficient. However, array design techniques do not take into account the mutual coupling effect among elements. In this article, the effect of mutual coupling on the array radiation pattern is investigated and discussed through studying the input impedance of the elements. Next, a technique for reducingmutual coupling based on radiation patterns of elements is presented. In this technique, the log-periodic dipole antenna with a frequency ranging from 900 MHz to 2500 MHz is selected as an array element. The results based on the FEKO magnetic field calculation program have shown that at 900 MHz, the proposed antenna array reaches a side-lobed level of -17.4 dB. At frequencies of 1500 MHz, 2000 MHz, 2500 MHz, the grating lobe levels of this antenna array are lower than 6.7 dB, 9.5 dBand 8.3 dB compared to those of the equally - spaced antenna array.","PeriodicalId":114451,"journal":{"name":"Journal of Science and Technology: Issue on Information and Communications Technology","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116259708","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}
引用次数: 0
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