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Spatial Mode-Division Multiplexing for High-Speed Optical Coherent Detection Systems

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ZTE Communications 2012年第1期10卷 18-22页

作者： william shieh Abdullah Al Amin Department of Electrical and Electronic Engineering The University of Melbourne

Spatial modedivision multiplexing is emerging as a potential solution to further increasing optical fiber capacity and spectral efficiency. We report a dualmode, dualpolarization transmission method based on modeselective excitation and detection over a twomode fiber. In particular, we present 107 Gbit/s coherent optical OFDM （COOFDM） transmission over a 4.5 km twomode fiber using LP and LP. modes in which mode separation is performed optically.

关键词： coherent communications few-mode fiber mode converter fiber optic components

Unknown DDoS Attack Detection with Fuzzy C-Means Clustering and Spatial Location Constraint Prototype Loss

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Computers, Materials & Continua 2024年第2期78卷 2181-2205页

作者： Thanh-Lam Nguyen HaoKao Thanh-Tuan Nguyen Mong-Fong Horng Chin-Shiuh shieh Department of Electronic Engineering National Kaohsiung University of Science and TechnologyKaohsiung807618Taiwan Department of Electronic and Automation Engineering Nha Trang UniversityNha Trang650000Vietnam

Since its inception,the Internet has been rapidly *** the advancement of science and technology and the explosive growth of the population,the demand for the Internet has been on the *** applications in education,healthcare,entertainment,science,and more are being increasingly deployed based on the ***,malicious threats on the internet are on the rise as *** Denial of Service(DDoS)attacks are among the most common and dangerous threats on the internet *** scale and complexity of DDoS attacks are constantly *** Detection Systems(IDS)have been deployed and have demonstrated their effectiveness in defense against those *** addition,the research of Machine Learning(ML)and Deep Learning(DL)in IDS has gained effective results and significant ***,one of the challenges when applying ML and DL techniques in intrusion detection is the identification of unknown *** attacks,which are not encountered during the system’s training,can lead to misclassification with significant *** this research,we focused on addressing the issue of Unknown Attack Detection,combining two methods:Spatial Location Constraint Prototype Loss(SLCPL)and Fuzzy C-Means(FCM).With the proposed method,we achieved promising results compared to traditional *** proposed method demonstrates a very high accuracy of up to 99.8%with a low false positive rate for known attacks on the Intrusion Detection Evaluation Dataset(CICIDS2017)***,the accuracy is also very high,reaching 99.7%,and the precision goes up to 99.9%for unknown DDoS attacks on the DDoS Evaluation Dataset(CICDDoS2019)*** success of the proposed method is due to the combination of SLCPL,an advanced Open-Set Recognition(OSR)technique,and FCM,a traditional yet highly applicable clustering *** has yielded a novel method in the field of unknown attack *** further expands the trend of applying DL and M

关键词： Cybersecurity DDoS unknown attack detection machine learning deep learning incremental learning convolutional neural networks(CNN) open-set recognition(OSR) spatial location constraint prototype loss fuzzy c-means CICIDS2017 CICDDoS2019

新型光接收系统架构:应用于超大容量低成本的短距光互连

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电信科学 2022年第7期38卷 43-56页

作者：计红林李雪阳贺志学胡卫生 william shieh 鹏城实验室先进承载网络技术研究所广东深圳518055 上海交通大学区域光纤通信网与新型光通信系统国家重点实验室上海200240 墨尔本大学电气与电子工程系澳大利亚墨尔本3010

大规模数据中心等新兴网络基础设施的部署急需超大容量低成本的短距光互连系统。传统的直调直检系统拥有简单的接收机结构,但只能检测信号的强度信息,这限制了其系统容量的进一步扩展。经典的相干传输系统能够调制解调高阶信号进而实现... 详细信息

大规模数据中心等新兴网络基础设施的部署急需超大容量低成本的短距光互连系统。传统的直调直检系统拥有简单的接收机结构,但只能检测信号的强度信息,这限制了其系统容量的进一步扩展。经典的相干传输系统能够调制解调高阶信号进而实现大容量传输,但收/发端都需要昂贵的窄线宽激光器和高复杂度的数字信号处理,这阻碍了其在短距光互连中的广泛应用。新型的直接检测光接收系统旨在结合直接检测和相干检测两者的优点,弥补二者之间的研究空白。因此,新型的光接收系统架构主要基于自相干检测。介绍了新型单偏振、双偏振、少模光接收系统架构。该类新型的光接收系统不需要本振激光器且能通过直接检测恢复光场信号,实现超大容量低成本的短距光互连。

关键词：短距光互连直接检测自相干检测自零差相干检测模分复用传输

Analysis of Landslide Dam Geometries

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Journal of Mountain Science 2011年第4期8卷 544-550页

作者： TSANG Yun-Chung shieh Chjeng-Lun Department of Hydraulic and Ocean Engineering National Cheng-Kung University

The geometry of a landslide dam is an important component of evaluating dam ***,the geometry of a natural dam commonly cannot be obtained immediately with field investigations due to their remote locations.A rapid evaluation model is presented to estimate the geometries of natural dams based on the slope of the stream,volume of landslides,and the properties of the *** proposed model uses high resolution satellite images to determine the geometry of the landside *** satellite images are the basic information to a preliminary stability analysis of a natural *** study applies the proposed method to two case studies in *** is the earthquakeinduced Lung-Chung landslide dam in Taitung,and the second is the rainfall-induced Shih-Wun landslide dam in Pingtung.

关键词： Landslide dam Geometries Stability

The inverse problem for differential pencils on a star-shaped graph with mixed spectral data

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Science China Mathematics 2020年第8期63卷 1559-1570页

作者： Yu Ping Wang Natalia Bondarenko Chung Tsun shieh Department of Applied Mathematics Nanjing Forestry UniversityNanjing 210037China Department of Applied Mathematics and Physics Samara National Research UniversitySamara 443086Russia Department of Mathematics Tamkang UniversityNew Taipei City 25137China

The partial inverse problem for differential pencils on a star-shaped graph is studied from mixed spectral *** precisely,we show that if the potentials on all edges on the star-shaped graph but one are known a priori then the unknown potential on the remaining edge can be uniquely determined by partial information on the potential and a part of eigenvalues.

关键词： inverse spectral problem differential pencils potential star-shaped graph

Discrete Circular Distributions with Applications to Shared Orthologs of Paired Circular Genomes

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Computer Modeling in Engineering & Sciences 2020年第6期123卷 1131-1149页

作者： Tomoaki Imoto Grace S.shieh Kunio Shimizu School of Management and Information University of ShizuokaShizuokaJapan Institute of Statistical Science Academia SinicaTaipeiTaiwan School of Statistical Thinking The Institute of Statistical MathematicsTokyoJapan

For structural comparisons of paired prokaryotic genomes,an important topic in synthetic and evolutionary biology,the locations of shared orthologous genes(henceforth orthologs)are observed as binned *** and other data,e.g.,wind directions recorded at monitoring sites and intensive care unit arrival times on the 24-hour clock,are counted in binned circular arcs,thus modeling them by discrete circular distributions(DCDs)is *** propose a novel method to construct a DCD from a base continuous circular distribution(CCD).The probability mass function is defined to take the normalized values of the probability density function at some pre-fixed equidistant points on the *** families of constructed DCDs which have normalizing constants in closed form are *** studies show that DCDs outperform the corresponding CCDs in modeling grouped(discrete)circular data,and minimum chi-square estimation outperforms maximum likelihood estimation for *** apply the constructed DCDs,invariant wrapped Poisson and wrapped discrete skew Laplace to compare the structures of paired bacterial ***,discrete four-parameter wrapped Cauchy(nonnegative trigonometric sums)distribution models multi-modal shared orthologs in Clostridium(Sulfolobus)better than the others considered,in terms of AIC and Freedman’s goodness-of-fit *** result that different DCDs fit the shared orthologs is consistent with the fact they belong to two ***,these prokaryotes have a common favored site around 70°on the unit circle;this finding is important for building synthetic prokaryotic genomes in synthetic *** DCDs can also be applied to other binned circular data.

关键词： Bacterial genomes circular distribution goodness-of-fit test modeling synthetic and evolutionary biology.

Rapid Geometry Analysis for Earthquake-induced and Rainfall-induced Landslide Dams in Taiwan

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Journal of Mountain Science 2014年第2期11卷 360-370页

作者： Kun-Ting CHEN Yu-Shu KUO Chjeng-Lun shieh Department of Hydraulic and Ocean Engineering National Cheng-Kung University

Stability analysis of the dam is important for disaster prevention and reduction. The dam's geometry plays an important role in understanding its stability. This study develops a rapid landslide dam geometry assessment method for both earthquake-induced and rainfall-induced landslide dams based on nine real cases collected in Chinese Taipei and 214 cases collected worldwide. For simplification purposes, a landslide dam is classified into triangular or trapezoidal. The rapid landslide dam geometry assessment method in this paper uses only satellite maps and the topographic maps to get landslide area, and then analyze the dam geometry. These maps are used to evaluate the area of the landslide and the slope of the river bed. Based on the evaluation information, the proposed method can calculate dam height, the length of the dam, and the angles of the dam in both upstream and downstream directions. These geometry parameters of a landslide dam provide important information for further dam stability analysis. The proposed methodology is applied to a real landslide dam case at Hsiaolin Village. The result shows that the proposed method can be used to assess the landslide dam geometry.

关键词： Landslide dam Dam geometry Dam stability analysis

Compressibility of a natural kyanite to 17.5 GPa

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Progress in Natural Science:Materials International 2009年第10期19卷 1281-1286页

作者： Sean R. shieh Michael E. Fleet Department of Earth Sciences University of Western Ontario

The compressional behaviour of a natural kyanite,(Al1.99Fe0.01)SiO5,has been investigated to about 17.5 GPa at 300 K using a diamond-anvil cell and synchrotron X-ray *** pressure-volume data fitted to the third-order Birch-Murnaghan equation of state(EoS) yield an isothermal bulk modulus(K0T) of 192 ± 6 GPa and pressure derivative(K00T) of 6 ± *** K00T is fixed as 4,the derived K0T is 201 ± 2 *** values are in excellent agreement with most experimental determinations in the ***,it can be concluded that the compressibility of kyanite under high pressures has been accurately constrained.

关键词： Compressibility High-pressure Isothermal bulk modulus Kyanite Synchrotron X-ray diffraction

KEY FACTORS FOR EFFICIENTLY IMPLEMENTING CUSTOMIZED E-LEARNING SYSTEM IN THE SERVICE INDUSTRY

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Journal of Systems Science and Systems Engineering 2011年第3期20卷 346-364页

作者： Ta-Sheng LO Tien-Hsiang CHANG Lon-Fon shieh Ya-Chuan CHUNG Department of Information Management National Taiwan University of Science and Technology Department of Information Management National Kaohsiung University of Applied Sciences Department of Business Management National United UniversityIndustrial Development BureauMinistry of Economic Affairs Advanced Semiconductor Engineering Inc.

In recent years, e-learning system has been adopted as a training tool in many firms, as it can help employees to complete training in a short time and at a low cost. Within this context, since 2003 the Industrial Development Bureau （IDB） of the Ministry of Economic Affairs （MOEA） in Taiwan sponsored more than 50 enterprises each year to help them implement customized e-learning systems. Past research on e-learning mostly focused on one criterion and adopted regression approach, such as examining the relationships between satisfaction or continued usage intentions and various antecedent factors. Although the regression method could uncover the significant factors of e-learning adoption, they can not show the can （weighting） of each factor, and thus firms cannot allocate the optimal levels of resources. To overcome this problem, this study collected factors related to finns implementing customized e-learning systems from a review of the literature and expert opinions, and then constructed a hierarchical factor table. Based on the appropriateness and independence of factors, and as assessed by experts in the project promotion office of the IDB, e-learning solution providers and project leaders of the IDB sponsored enterprises, this paper then designed an Analytical Hierarchy Process （AHP） format questionnaire and sent it to these same experts to gather their responses. The factor weightings were derived based on the Fuzzy Analytic Hierarchy Process （FAHP） method. Finally, analysis of key factors was performed and recommendations provided. Based on the results for this work, service industry firms with limited resources can achieve proper resource allocation and more quickly and successfully adopt customized e-Learning systems.

关键词： E-learning system platform fuzzy AHP