Abstract — Complex networks are constructed to study correlations between the closing prices for all US stocks that were traded from July 1, 2005 to August 30, 2007. The nodes are the stocks, and...
Source Extraction in Bandwidth Constrained Wireless Sensor Networks (2009)
Hongbin Chen, Chi K. Tse, Jiuchao Feng
Abstract—Source extraction was traditionally done by sensor arrays. Recently, sensor networks have been considered as promising candidates for extraction of multiple sources. In a sensor network,...
An Efficient Data Collecting Network Structure in Wireless Sensor Networks (2009)
Abstract — In a sensor network, a single event may be captured by hundreds of sensor nodes simultaneously. Data in these sensor nodes are thus highly correlated. Data transmission can be...
Abstract — This paper studies the various paralleling styles for dc/dc switching converters from a circuit theoretic viewpoint. The purpose is to examine all possible paralleling structures and...
Siew-chong Tan, Y. M. Lai, Chi K. Tse, Luis Martínez-salamero, Senior Member, Chi-kin Wu
Abstract—This paper proposes a fast-response sliding-mode controller for controlling boost-type converters requiring a fast dynamical response over a wide range of operating conditions. The various...
Sustained Slow-Scale Oscillation in Higher Order Current-Mode Controlled Converter (2009)
Siu Chung Wong, Xiaoqun Wu, Chi K. Tse
Abstract—DC–DC converters under current-mode control have been known to exhibit slow-scale oscillation as a result of a Hopftype bifurcation as one or more of the parameters of the outer voltage...
Propagation Characteristics of UWB Radio in a High-Rise Apartment (2009)
Abstract- Among many other applications, ultra wideband UWB technology for WPANs or more specifically wireless (UWB) is considered a promising technology to be deployed for body area networks (WBAN),...
Potpourri of Applications of Complex Networks Research (2009)
Abstract — Research on complex networks has been a subject of rigorous theoretical research in the mathematics and physics research communities in the past decade. The many discoveries that...
Stability Study of the TCP-RED System Using Detrended Fluctuation Analysis (2009)
Xi Chen, Siu-chung Wong, Chi K. Tse, Ljiljana Trajković
Abstract — It has been observed that the TCP-RED system may exhibit instability and oscillatory behavior. Control methods proposed in the past have been based on the analytical models that rely on...
Construction of Scale-Free Networks with Adjustable Clustering (2009)
Abstract — A complex network is characterized by its degree distribution and clustering coefficient. Given a scale-free network, we propose a node-reconnection algorithm that can alter the...
Adaptive Feedback Synchronization of a General Complex Dynamical Network With Delayed Nodes (2009)
Qunjiao Zhang, Junan Lu, Jinhu Lü, Senior Member, Chi K. Tse
Abstract—In the past decade, complex networks have attracted much attention from various fields of sciences and engineering. Synchronization is a typical collective behavior of complex networks...
Fundamental Considerations of Three-Level DC–DC Converters: Topologies, Analyses, and Control (2009)
Xinbo Ruan, Senior Member, Bin Li, Qianhong Chen, Siew-chong Tan, Chi K. Tse
Abstract—This paper discusses the basic family of three-level (TL) dc–dc converters. The origin of TL converters and their basic topological variations are described. Systematic procedures...
Stability Analysis of TCP/RED Communication Algorithms (2009)
Ljiljana Trajković, Xi Chen, Siu-chung Wong, Chi K. Tse, Alfredo Marciello, Mario Di Bernardo, ...
TCP/RED congestion control algorithms: an overview Discrete-time dynamical model of TCP Reno with RED Discontinuity-induced bifurcations in TCP/RED Stability analysis of RED gateway with multiple TCP...
Indirect Sliding Mode Control of Power Converters Via Double Integral Sliding Surface (2009)
Siew-chong Tan, Y. M. Lai, Chi K. Tse
Abstract—The steady-state regulation error in power converters that use the conventional hysteresis-modulation-based sliding mode controller can be suppressed through the incorporation of an...
A Mathematical Approach to Derive Optimum Detector Configurations for UWB Radio Applications (2009)
Géza Kolumbán, Tamás Krébesz, Chi K. Tse
Abstract—A systematic approach for the derivation of UWB detectors cannot be found in the literature. The detectors published up to now have been developed by inspection, using a heuristic...
Color Control System for RGB LED Light Sources Using Junction Temperature Measurement (2009)
Xiaohui Qu, Siu Chung Wong, Chi K. Tse
Abstract-The efficiency of LED lights is approaching that of fluorescent lamps. LED light sources are finding more applications than conventional light bulbs due to their compactness, lower heat...
Structural Equivalence Between Co-occurrences of Characters and Words in the Chinese Language (2009)
Yuming Shi, Wei Liang, Jing Liu, Chi K. Tse
Abstract—Complex networks are constructed for studying the co-occurrence of characters and words in the Chinese language. Two types of networks are investigated. In the first type, nodes correspond...
Stability Study of the TCP-RED System Using Detrended Fluctuation Analysis (2009)
Xi Chen, Siu-chung Wong, Chi K. Tse, Ljiljana Trajković
Abstract — It has been observed that the TCP-RED system may exhibit instability and oscillatory behavior. Control methods proposed in the past have been based on the analytical models that rely on...
Path Cost Optimization Using Genetic Algorithm with Supervised Crossover Operator (2009)
Chi-tsun Cheng, Kia Fallahi, Henry Leung, Chi K. Tse
Path cost optimization is essential for maneuvering vehicles in a cost effective way. The term cost can be interpreted as fuel consumption, path visibility, probability of being detected, probability...
Study of Anti-Jamming Capabilities of Chaotic Digital Communication Systems (2008)
Chaos-based communication systems are known to offer advantages that are shared by spread-spectrum communications. One important aspect of performance of any spreadspectrum communication system is...
Stability Analysis of RED Gateway with Multiple TCP Reno Connections (2008)
Xi Chen, Siu-chung Wong, Chi K. Tse, Ljiljana Trajkovíc
Abstract — It has been observed that a bottleneck Random Early Detection (RED) gateway becomes oscillatory when regulating a flow in multiple TCP connections. The stability boundary of the TCP-RED...
Abstract BIFURCATION ANALYSIS BASED CONTROL DESIGN FOR VIRTUAL NEGATIVE INDUCTANCE (2008)
Octavian Dranga, Hirohito Funato, Satoshi Ogasawara, Chi K. Tse
Previous studies have already introduced a variable active-passive reactance (VAPAR) to be used as virtual inductance in power circuits. Its most remarkable feature of generating a negative virtual...
Coexistence of Chaos-Based and Conventional Digital Communication Systems of Equal Bit Rate (2008)
Senior Member, Chi K. Tse, Senior Member, Ming Ye, Sau F. Hau
Abstract—Chaos-based communication systems represent a new category of spread-spectrum communication systems, whose working principle differs significantly from conventional direct-sequence and...
SPREAD-SPECTRUM COMMUNICATION SYSTEMS* (2008)
Abstract. From the spectrum utilization point of view, an M-ary modulation scheme is sometimes preferred over a binary one because more data can be transmitted in the same bandwidth. In this paper,...
Siew-chong Tan, Y. M. Lai, Chi K. Tse, Luis Martinez-salamero, Angel Cid-pastor
Abstract — This paper presents an approach of designing fixed-frequency pulsewidth-modulation based sliding mode controllers for power converters operating in the discontinuous conduction mode. The...
In this paper, a symbolic method is proposed for analyzing the bifurcation in switching power converters. This method focuses on the cyclic operation of the system which characterizes its bifurcation...
A SYSTEMATIC DESIGN PROCEDURE FOR SLIDING MODE CONTROLLED BUCK CONVERTERS (2008)
Siew-chong Tan, Y. M. Lai, Chi K. Tse
This paper presents a systematic design procedure for sliding mode voltage controlled buck converters operating in continuous conduction mode. The discussion covers different practical aspects...
Abstract—With reference to a recently published paper, the realization of line and load regulation in switched-capacitor-based converters is discussed. We point out that achieving zero-current...
N. K. Poon, Senior Member, C. P. Liu, Chi K. Tse, Senior Member
Abstract—This paper proposes a simple lumped circuit modeling approach for describing noncontact EMI coupling mechanisms in switching power converters. The resulting model assumes a minimum number...
Slow-Scale Instability of Single-Stage Power-Factor-Correction Power Supplies (2008)
Dong Dai, Shengnan Li, Xikui Ma, Chi K. Tse
Abstract—This paper reports slow-scale instability in a single-stage power-factor-correction (PFC) power supply, which is a popular design solution for low power applications. The circuit employs a...
Comments on ‘Unified analysis of switched-capacitor resonant converters (2008)
Adrian Ioinovici, Marek S. Makowski, Chi K. Tse
Abstract—The realization of line and load regulation in switchedcapacitor (SC)-based converters is discussed. A duty-cycle control is based on partial charging of the capacitors in the circuit. The...
WAVELET-TRANSFORM-BASED STRATEGY FOR GENERATING NEW CHINESE FONTS (2008)
Based on the cubic B-spline curve, new Chinese fonts are generated by wavelet transforms in this paper. The outlines of Chinese fonts are first transformed into B-spline curves. Then, using wavelet...
A Neural-Network-Based Channel-Equalization Strategy for Chaos-Based Communication Systems (2008)
Abstract—This brief addresses the channel-distortion problem and proposes a technique for channel equalization in chaos-based communication systems. The proposed equalization is realized by a...
Application of Novel h P „ Control to Single-Switch Two-Output Switching Power Converters (2008)
Siu-chung Wong, Chi K. Tse, Senior Member
Abstract—A novel method for programming current in dc/dc converters operating in discontinuous conduction mode is described in this paper. The control variable is the product of the square of the...
A Permutation-based Multiple Access DCSK System (2008)
This paper presents a method to enhance the differential chaos-shift-keying (DCSK) and multiple access DCSK systems. By introducing a permutation transformation which destroys the similarity between...
GENERALIZATION OF WAVEFORM COMMUNICATIONS: THE FOURIER ANALYZER APPROACH* (2008)
Abstract. In digital communications, fixed, chaotic, and random waveforms are used. Although the theory of fixed waveform communications is well established, its generalization to include chaotic and...
In a multiple access spread-spectrum communication system, the bit error performance is usually limited by the mutual interference between users. The use of multi-user detection is an effective...
Performance Considerations of PFC Switching Regulators Based on Non-Cascading Structures (2008)
Abstract — This paper discusses the characteristics of powerfactor-correction (PFC) switching regulators of non-cascading structures in terms of efficiency, input current harmonic distortion, and...
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS (2008)
Fast-scale instability in a PFC boost converter under average current-mode control
Chi K. Tse, N. K. Poon, Senior Member, Y. M. Lai
Abstract—This paper presents an ac–dc converter topology for realization of power factor correction (PFC) voltage regulators for applications where the mains frequency is high and a low input...
Xiaoqun Wu, Siu-chung Wong, Chi K. Tse, Junan Lu
Abstract — The SPICE simulation program is widely used as a brute force simulator for analyzing and designing switching power converters. Results from SPICE are mostly useful, but their integrity...
CO-EXISTENCE OF CHAOS-BASED AND CONVENTIONAL DIGITAL COMMUNICATION SYSTEMS (2008)
This paper studies the performance of selected chaos-based communication systems whose spectrum overlaps with that of conventional narrowband systems. Such a scenario may occur in normal practice...
Stability Analysis of RED Gateway with Multiple TCP Reno Connections (2008)
Xi Chen, Siu-chung Wong, Chi K. Tse, Ljiljana Trajkovíc
Abstract — It has been observed that a bottleneck Random Early Detection (RED) gateway becomes oscillatory when regulating a flow in multiple TCP connections. The stability boundary of the TCP-RED...
Design of a1kWPFCPowerSupply Based on Reduced Redundant Power Processing Principle (2008)
Abstract — This paper presents a single phase power factor correction (PFC) power supply topology based on a non-cascading connection of a current-fed full-bridge converter and a buckboost...
An Analog Implementation to Improve Load Transient Response of PFC Pre-regulators (2008)
Abstract — This paper presents an analog implementation to improve the load transient response of PFC pre-regulators. By means of a notch filter inserted between the output-voltage sensing network...
Abstract—This paper studies a system of parallelconnected dc/dc buck converters under democratic currentsharing control. Under this control scheme, the reference current is generated by a typical...
Chaos-based communications can be applied advantageously if the property of chaotic systems is suitably exploited. In this Letter a simple noncoherent detection method for chaos-shift-keying (CSK)...
Permutation-Based DCSK and Multiple-Access DCSK Systems (2008)
Senior Member, Kai Y. Cheong, Chi K. Tse, Senior Member
Abstract—This paper presents a method for enhancing the differential chaos-shift-keying (DCSK) and multiple access DCSK systems. By introducing a permutation transformation which destroys the...
Controlling Chaos in DC/DC Converters Using Optimal Resonant Parametric Perturbation (2008)
Yufei Zhou, Chi K. Tse, Jun-ning Chen
Abstract—The method of resonant parametric perturbation is a simple non-feedback chaos control method which is easy to implement in practice. In this paper, an optimal strategy is applied to...
Channel Equalization for Chaos-based Communication Systems (2008)
Abstract — The performance of chaos-based communication systems is greatly affected by non-ideal channel characteristics such as bandwidth limitation, distortion and additive noise. Systems that...
Determinism in Financial Time Series (2008)
Copyright c○2003 by the authors. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic,...
Yuehui Huang, Student Member, Chi K. Tse
Abstract—This paper describes a classification of paralleling schemes for dc–dc converters from a circuit theoretic viewpoint. The purpose is to provide a systematic classification of the types...
Optimum Design of Very Low Distortion Class E Power Amplifiers (2008)
Abstract — In this paper 1 the optimum design of a class E power amplifier with resonant tank being symmetrically driven by two class E circuits is studied. The optimally designed symmetrical class...
A General Noncoherent Chaos-Shift-Keying Communication System and its Performance Analysis (2008)
Hongbin Chen, Jiuchao Feng, Chi K. Tse
Abstract — A general noncoherent chaos-shift-keying (CSK) communication system with adjustable weights is proposed in this paper. The performance of the system under additive white Gaussian noise...
Abstract Bifurcation in a System of Coupled Buck Converters (2008)
This paper studies the bifurcation behaviour of a system of coupled buck converters under current-mode control. The effects due to the variation of the reference current are studied. It has been...
Xiaoqun Wu, Siu-chung Wong, Chi K. Tse, Junan Lu
Abstract—The SPICE simulation program is widely used as a brute force simulator for analyzing and designing switching power converters. Results from SPICE are mostly useful, but their integrity is...
Abstract — The performance of the noncoherent differential chaos-shift keying (DCSK) communication system over a multipath fading channel with delay spread is evaluated. Analytical expressions of...
“INTERMITTENT ” CHAOS AND SUBHARMONICS IN SWITCHING POWER SUPPLIES (2008)
This paper studies the “intermittent ” chaos and subharmonics observed in switching dc/dc converters using a simple circuit model that describes possible unintended coupling of some weak spurious...
In this paper, a multiple access technique is proposed for chaosbased communication systems in which chaotic reference signals are transmitted together with the information-bearing signals. Chaotic...
Abstract — In this paper, chaos in a current-mode controlled boost converter is studied. Firstly, the existence of chaos is proven theoretically in this system. The proof consists of showing that...
ANEAR-OPTIMAL NONCOHERENT CHAOS-BASED COMMUNICATION SCHEME* (2008)
Abstract. In this paper we introduce a method for improving the performance of noncoherent chaos-based communication systems. This method involves transforming chaotic signals into predefined...
In this paper, parallel interference cancellation (PIC) detectors are applied to jointly decode symbols in a multiple access chaoticsequence spread-spectrum communication system. In particular, three...
Source Extraction in a Bandwidth Constrained Wireless Sensor Network (2008)
Hongbin Chen, Chi K. Tse, Jiuchao Feng
coefficient In this paper, we propose a blind source extraction scheme in a bandwidth constrained wireless sensor network. We consider the extraction of multiple source signals in a sensing field....
Study of Anti-Jamming Capabilities of Chaotic Digital Communication Systems (2008)
Chaos-based communication systems are known to offer advantages that are shared by spread-spectrum communications. One important aspect of performance of any spreadspectrum communication system is...
Kam C. Tam, Student Member, Siu-chung Wong, Chi K. Tse, Senior Member
Abstract—Due to the switching action and the presence of parasitics, waveforms arising from power electronics circuits often contain high-frequency ringings embedded in slowly varying segments....
A Subtle Link in Switched Dynamical Systems: Saddle-Node Bifurcation Meets Border Collision (2008)
Yue Ma, Chi K. Tse, Takuji Kousaka, Hiroshi Kawakami
Abstract — Switched dynamical systems are known to exhibit border collision, in which a particular operation is terminated and a new operation is assumed as one or more parameters are varied. In...
GUEST EDITORIAL* Guest Editors (2008)
The past two decades have seen heightened interest among the applied science and engineering research communities in the use of chaos in solving practical engineering problems [1]–[8]. One of the...
18 Experimental Techniques for Investigating Chaos in Electronics (2008)
In the study of nonlinear phenomena in electronics, experiments are indispensable for the purpose of verifying the analytical findings and simulation results. This chapter begins with a discussion on...
converters and e ects of incompatible periodicities (2008)
Jianlong Zou, Xikui Ma, Chi K. Tse, Dong Dai
In this paper, we derive the discrete-time model for the power-factor-correction (PFC) buck-boost converter in terms of a stroboscopic switching map. Fast-scale instability is analysed through a fold...
Yue Ma, Chi K. Tse, Senior Member, Takuji Kousaka, Hiroshi Kawakami
Abstract—Switched dynamical systems are known to exhibit border collision, in which a particular operation is terminated and a new operation is assumed as one or more parameters are varied. In this...
A Model for Stability Study of PFC Power Supplies (2008)
Grace Chu, Chi K. Tse, Siu Chung Wong
Abstract — Typically a power-factor-correction power supply consists of two stages, one responsible for power factor correction and the other for voltage regulation. In this paper, we propose to...
Study of Stability Regions in Parallel Connected Boost Converters (2008)
Abstract — This paper describes the coexisting attractors of parallel connected boost switching converters under a masterslave current sharing scheme. We present the basins of attraction of desired...
Abstract—This brief studies the performance of selected chaos-based systems which share their frequency bands with conventional spread-spectrum systems. Such a scenario may occur in normal practice...
Kam C. Tam, Siu Chung Wong, Chi K. Tse
Abstract — Wavelet transform has been found very suitable for approximating steady-state waveforms of power electronics circuits. However, the time-domain piecewise property of power electronics...
Stability Analysis of Complete Two-Stage Power-Factor-Correction Power Supplies (2008)
Octavian Dranga, Chi K. Tse, Siu Chung Wong
Abstract — Power-factor-correction (PFC) power supplies are required to provide high input power factor and tight output voltage regulation. The usual configuration takes a two-stage cascade...
Dong Dai, Shengnan Li, Xikui Ma, Chi K. Tse
Abstract — This paper reports intermediate-scale instability in a single-stage power-factor-correction (PFC) power supply that employs a cascade configuration of a boost stage operating in...
Design of Symmetrical Class E Power Amplifiers for Very Low Harmonic-Content Applications (2008)
Siu-chung Wong, Chi K. Tse, Senior Member
Abstract—Class E power amplifier circuits are very suitable for high efficiency power amplification applications in the radio-frequency and microwave ranges. However, due to the inherent...
Convergence Analysis of the Unscented Kalman Filter for Filtering Noisy Chaotic Signals (2008)
Jiuchao Feng, Hongjuan Fan, Chi K. Tse
Abstract — The unscented Kalman filter (UKF) has recently been proposed for filtering noisy chaotic signals. Though computationally advantageous, the UKF has not been thoroughly analyzed in terms...
A Constant-Power Battery Charger With Inherent Soft Switching and Power Factor Correction (2008)
N. K. Poon, Senior Member, Chi K. Tse, Senior Member
Abstract—A battery charging circuit, which operates as a constant power source, is proposed in this paper. By maintaining a constant output power throughout the charging process, the circuit...
COMMUNICATION SYSTEMS IN THE PRESENCE OF A (2008)
Pulsed-noise Jammer, Chi K. Tse
Abstract. Chaos-based communication systems are known to offer advantages that are shared by spread-spectrum communications. One important aspect of the performance of any spread-spectrum...
Wai M. Tam, Senior Member, Chi K. Tse, Senior Member
Abstract—In this paper, a multiple access (MA) technique is proposed for chaos-based communication systems, in which chaotic reference signals are transmitted followed by the information-bearing...
Siew-chong Tan, Y. M. Lai, Chi K. Tse
Abstract — This paper examines the practical design issues of sliding mode controllers as applied to the control of DC– DC converters. A comprehensive review of the relevant literature is first...
General Impedance Synthesis Using Simple Switching Converters (2008)
Abstract — A general impedance synthesizer using a minimum number of switching converters is studied in this paper. We begin with showing that any impedance can be synthesized by a circuit...
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS (2008)
A wavelet approach to fast approximation of steady-state waveforms of power electronics circuits
Traffic Analysis of a Mobile Communication System Based on a Scale-Free User Network (2008)
Wai M. Tam, Chi K. Tse, Yongxiang Xia, Michael Small
Abstract—In the traditional study of mobile cellular systems, all users are assumed to have the same behaviour. They have the same probability of making/receiving a call and they will move around...
16 Chaos in Power Electronics: An Overview (2008)
Power electronics is rich in nonlinear dynamics. Its operation is characterized by cyclic switching of circuit topologies, which gives rise to a variety of nonlinear behavior. This chapter provides...
Performance of FM-DCSK Communication System Over a Multipath Fading Channel with Delay Spread (2008)
Yongxiang Xia, Chi K. Tse, Géza Kolumbán
Abstract—Multipath performance is an important consideration for chaos-based communication systems. In this paper the performance of the FM-DCSK communication system over a two-ray independent...
A number of schemes have been proposed for communication using chaos over the past years. Regardless of the exact modulation method used, the transmitted signal must go through a physical channel...
A PFC Topology with Low Input Current Distortion Suitable for Aircraft Power Supplies (2008)
Chi K. Tse, N. K. Poon, Y. M. Lai, M. H. Pong
Abstract — This paper presents an AC-DC converter topology for realization of PFC converters for applications where the mains frequency is high and a low input current harmonics is required, e.g.,...
On the Effects of Voltage Loop in Paralleled Converters Under Master-Slave Current Sharing (2008)
Abstract — This paper studies the effects of the presence of voltage loops in parallel connected buck switching converters under master-slave current sharing scheme. The system employs a typical...
Modeling the Telephone Call Network (2008)
Abstract — It is natural to envisage that in a telephone network, some telephone numbers originate or receive more calls than others. Indeed, real-life data have verified the conjecture that the...
Sufen Chen, Y. M. Lai, Siew-chong Tan, Chi K. Tse
Abstract — This paper presents an analysis of the application and optimal design of the repetitive controller for eliminating harmonic distortion in pulse-width modulation voltage source inverter...
A Bio-Inspired Algorithm for Performance Optimization in Wireless Sensor Networks (2008)
Abstract—A wireless sensor network typically comprises a number of inexpensive power constrained sensors which collect data from the sensing environment and transmit them towards the base station...
Stability Analysis of TCP/RED Communication Algorithms (2008)
Ljiljana Trajković, Mingjian Liu, Hui Zhang, Alfredo Marciello, Mario Di Bernardo, Xi Chen, ...
TCP/RED congestion control algorithms: an overview Discrete-time dynamical models of TCP Reno with RED Discontinuity-induced bifurcations in TCP/RED Stability analysis of RED gateway with multiple...
Stability Analysis of TCP/RED Communication Algorithms (2008)
Ljiljana Trajković, Mingjian Liu, Hui Zhang, Alfredo Marciello, Mario Di Bernardo, Xi Chen, ...
TCP/RED congestion control algorithms: an overview Discrete-time dynamical models of TCP Reno with RED Discontinuity-induced bifurcations in TCP/RED Stability analysis of RED gateway with multiple...
Detecting stock market fluctuation from stock network structure variation (2008)
Jing Liu, Chi K. Tse, Keqing He
Abstract — We study the structural variation of networks formed by connecting Standard & Poor’s 500 (S&P500) stocks that were traded from January 1, 2000 to December 31, 2004. The...
Analyzing and composing music with complex networks: finding structures (2008)
Chi K. Tse, Xiaofan Liu, Michael Small
Abstract—In this paper we study the network structure in music and attempt to compose music artificially. Networks are constructed with nodes and edges corresponding to musical notes and their...
Abstract—This paper discusses a systematic method for deriving basic converter configurations that achieve power factor correction (PFC) and voltage regulation. The discussion begins with a general...
Yim-shu Lee, Chi K. Tse, Senior Member, Senior Member
Abstract—In this paper, a simple control method is presented for a single-stage single-switch isolated power-factor-correction (PFC) regulator that can simultaneously achieve unity power factor and...
Classification of parallel dc/dc converters part I: circuit theory,” submitted to ECCTD’07 (2007)
Abstract — This paper describes a classification of paralleling schemes for dc/dc converters from a circuit theoretic viewpoint. The purpose is to provide a systematic classification of the types...
Classification of parallel dc/dc converters part I: circuit theory,” submitted to ECCTD’07 (2007)
Abstract — This paper describes the current sharing and voltage regulation performance of three types of paralleling configurations, i.e., paralleling Thévenin sources, paralleling one Thévenin...
OSCILLATION AND PERIOD DOUBLING IN TCP/RED SYSTEM: ANALYSIS AND VERIFICATION (2007)
Xi Chen, Siu-chung Wong, Chi K. Tse
It has been known that a bottleneck RED (Random Early Detection) gateway can become oscillatory when regulating multiple identical TCP (Transmission Control Protocol) flows. However, a systematic...
CHARACTERIZING THE STRUCTURAL QUALITY OF GENERAL COMPLEX SOFTWARE NETWORKS (2007)
Jing Liu, Jinhu Lü, Bing Li, Chi K. Tse
Software systems can be modeled as complex networks in which software components are abstract nodes and their interactions are abstract edges. This paper attempts to characterize the structural...
c ○ World Scientific Publishing Company COMPLEX INTERMITTENCY IN SWITCHING CONVERTERS (2007)
Yufei Zhou, Jun-ning Chen, Chi K. Tse
Intermittent instability is commonly observed in switching power supplies during the design and development phase. It manifests as symmetrical period-doubling bifurcation in the time domain with long...
Analysis of telephone network traffic based on a complex user network (2006)
Xia, Yongxiang, Tse, Chi K., Lau, Francis C. M., Tam, Wai Man, Small, Michael
The traffic in telephone networks is analyzed in this paper. Unlike the classical traffic analysis where call blockings are due to the limited channel capacity, we consider here a more realistic...
turbo product code decoders (2006)
Yejun He, Chi K. Tse, Communicated Prof
This article was published in an Elsevier journal. The attached copy is furnished to the author for non-commercial research and education use, including for instruction at the author’s institution,...
Siew-chong Tan, Y. M. Lai, Chi K. Tse, Student Member
Abstract—A major disadvantage of applying sliding mode control to dc/dc converters is that the steady-state switching frequency is affected by line and load variations. This is undesirable as it...
In this paper, we propose a generalized correlation-delay-shiftkeying (GCDSK) scheme for noncoherent chaos-based communications. In the proposed scheme, several delayed versions of a chaotic signal...
A pulsewidth modulation based integral sliding mode current controller for boost converters (2006)
Siew-chong Tan, Y. M. Lai, Chi K. Tse, Chi Kin Wu
Abstract — This paper proposes a fixed-frequency pulsewidth-modulation based sliding mode current controller for boost converters. The aim of having such a nonlinear controller is to support the...
Fast-scale instability of singlestage power-factor-correction power supplies (2006)
Xiaoqun Wu, Chi K. Tse, Octavian Dranga, Junan Lu
Abstract—This paper describes the fast-scale bifurcation phenomena of a single-stage power-factor-correction (PFC) power supply which is a cost effective design for low-power applications. The...
Analysis of telephone network traffic based on a complex user network (2006)
Yongxiang Xia, Chi K. Tse, Wai Man Tam, Michael Small
The traffic in telephone networks is analyzed in this paper. Unlike the classical traffic analysis where call blockings are due to the limited channel capacity, we consider here a more realistic...
Wai M. Tam, Senior Member, Chi K. Tse
Abstract—In this paper, we propose a generalized correlationdelay-shift-keying (GCDSK) scheme for noncoherent chaos-based communications. In the proposed scheme, several delayed versions of a...
Fast-scale instability of singlestage power-factor-correction power supplies (2006)
Xiaoqun Wu, Chi K. Tse, O. Dranga
Abstract — This paper describes the fast-scale bifurcation phenomena of a single-stage power-factor-correction (PFC) power supply which is commonly used in low power applications. The circuit...
Xiaoqun Wu, Chi K. Tse, Siu Chung Wong, Junan Lu
This paper describes the fast-scale bifurcation phenomena of a single-stage single-switch power-factorcorrection (PFC) regulator comprising a boost stage operating in discontinuous conduction mode...
Siu-chung Wong, Chi K. Tse, Mohamed Orabi, Tamotsu Ninomiya
Abstract—This paper describes the modeling of power-factorcorrection converters under average-current-mode control, which are widely used in switch-mode power supply applications. The objective is...
Siew-chong Tan, Y. M. Lai, Chi K. Tse
Abstract—This paper presents a simple unified approach to the design of fixed-frequency pulsewidth-modulation-based sliding-mode controllers for dc–dc converters operating in the continuous...
c ○ World Scientific Publishing Company STUDY OF BIFURCATION BEHAVIOR OF LDPC DECODERS (2005)
Xia Zheng, Chi K. Tse, S. C. Wong
The use of low-density-parity-check (LDPC) codes in coding digital messages has aroused much research interest because of their excellent bit-error performance. The behavior of the iterative LDPC...
Telephone traffic analysis based on a scale-free user network (2005)
Yongxiang Xia, Chi K. Tse, Wai Man Tam, Michael Small
Abstract—In this paper we analyze the traffic of telephone systems. Unlike classical traffic analysis where users are assumed to be connected uniformly, our proposed method employs a small-world...
Siew-chong Tan, Y. M. Lai, Chi K. Tse, Senior Member, Student Member, ...
Abstract—This paper presents the design and analysis of a fixed-frequency pulsewidth modulation (PWM)-based quasi-sliding-mode voltage controller for buck converters from a circuit design...
Dong Dai, Chi K. Tse, Senior Member, Xikui Ma
Abstract—A symbolic method is proposed in this paper for analyzing the bifurcation behavior of switching nonsmooth systems. The proposed method focuses on the symbolic sequence describing the...
Implementation of pulse-widthmodulation based sliding mode controller for boost converters (2005)
Siew-chong Tan, Y. M. Lai, Chi K. Tse
Abstract — This paper presents the design and analysis of a pulse-width-modulation based sliding mode voltage controller for buck converters from a circuit design perspective. A practical design...
GENERAL CONSIDERATION FOR MODELING AND BIFURCATION ANALYSIS OF SWITCHED DYNAMICAL SYSTEMS (2005)
Yue Ma, Hiroshi Kawakami, Chi K. Tse
In much of the previous study of switched dynamical systems, it has been assumed that switching occurs at a common border between two regions in the same space as the system trajectory crosses the...
On the practical design of a sliding mode voltage controlled buck converter (2005)
Siew-chong Tan, Student Member, Y. M. Lai, Chi K. Tse, Senior Member
Abstract—This paper presents a simple and systematic approach to the design of a practical sliding mode voltage controller for buck converters operating in continuous conduction mode. Various...
Bifurcation analysis of switched dynamical systems with periodically moving borders (2004)
Yue Ma, Hiroshi Kawakami, Chi. K Tse
This paper describes a method for analyzing the bifurcation phenomena in switched dynamical systems whose switching borders are varying periodically with time. The type of systems under study covers...
COMMUNICATION SYSTEM OVER MULTIPATH FADING CHANNELS WITH DELAY SPREAD (2004)
Multipath performance is an important consideration for chaos-based communication systems. In this letter, the performance of the FM-DCSK communication system over multipath fading channels is...
An adaptive sliding mode controller for buck converter in continuous conduction mode (2004)
Siew-chong Tan, Y. M. Lai, Chi K. Tse
Abstract — This paper proposes a new adaptive sliding mode controller for buck converter operating in the continuous conduction mode. Through gain scheduling, the controller is designed to monitor...
We model transmission of the Severe Acute Respiratory Syndrome (SARS) associated coronavirus (SARS-CoV) in Hong Kong with a complex small world network. Each node in the network is connected to its...
In this letter, chaos in a current-mode controlled boost converter is studied. Firstly, the existence of chaos is proven theoretically in this system. The proof consists of showing that the dynamics...
Yongxiang Xia, Chi K. Tse, Senior Member, Senior Member
Abstract—The performance of the noncoherent differential chaos-shift-keying (DCSK) communication system over a multipath fading channel with delay spread is evaluated. Analytical expressions of the...
Exact analytical bit error rates for multiple access chaos-based communication systems (2004)
Wai M. Tam, Chi K. Tse, Senior Member, Senior Member, Anthony J. Lawrance
Abstract—In this paper, exact analytical expressions for the bit error rates (BERs) in a multiple-access chaos-based digital communication system are derived. Comparisons are made with those...
Synthesis of input-rectifierless ac/dc converters (2004)
C. P. Liu, Chi K. Tse, N. K. Poon, Senior Member, Senior Member, ...
Abstract—This paper discusses the basic construction procedure and topological possibilities of creating ac/dc converters out of simple dc/dc converters. It is shown that two separately controlled...
Bifurcation analysis of switched dynamical systems with periodically moving borders (2004)
Yue Ma, Hiroshi Kawakami, Chi K. Tse, Senior Member
Abstract—This paper describes a method for analyzing the bifurcation phenomena in switched dynamical systems whose switching borders are varying periodically with time. The type of systems under...
The performance of coherent antipodal chaos-shift-keying (CSK) communication systems in a multipath channel is evaluated. A two-ray independent Rayleigh fading channel model is considered. Also...
Determinism in Financial Time Series (2003)
The attractive possibility that financial indices may be chaotic has been the subject of much study. In this paper we address two specific questions: "Masked by stochasticity, do financial data...
Determinism in Financial Time Series (2003)
The attractive possibility that financial indices may be chaotic has been the subject of much study. In this paper we address two specific questions: "Masked by stochasticity, do financial data...
Determinism in Financial Time Series (2003)
The attractive possibility that financial indices may be chaotic has been the subject of much study. In this paper we address two specific questions: "Masked by stochasticity, do financial data...
Determinism in Financial Time Series (2003)
The attractive possibility that financial indices may be chaotic has been the subject of much study. In this paper we address two specific questions: "Masked by stochasticity, do financial data...
Bifurcation behavior of a power-factor-correction boost converter (2003)
Dranga, Octavian, Tse, Chi K., Iu, Herbert H. C., Nagy, Istvan
The aim of the paper is to investigate the bifurcation behavior of the power-factor-correction (PFC) boost converter under a conventional peak current-mode control. The converter is operated in...
Optimal embedding parameters: A modelling paradigm (2003)
Reconstruction of a dynamical system from a time series requires the selection of two parameters, the embedding dimension $d_e$ and the embedding lag $\tau$. Many competing criteria to select these...
Bifurcation behavior of a power-factor-correction boost converter (2003)
Dranga, Octavian, Tse, Chi K., Iu, Herbert H. C., Nagy, Istvan
The aim of the paper is to investigate the bifurcation behavior of the power-factor-correction (PFC) boost converter under a conventional peak current-mode control. The converter is operated in...
Bifurcation behavior of a power-factor-correction boost converter (2003)
Dranga, Octavian, Tse, Chi K., Iu, Herbert H. C., Nagy, Istvan
The aim of the paper is to investigate the bifurcation behavior of the power-factor-correction (PFC) boost converter under a conventional peak current-mode control. The converter is operated in...
On optimal detection of noncoherent chaosshift-keying signals in a noisy environment (2003)
Recently, an optimal noncoherent detection technique for chaos-shift-keying digital communication system has been proposed. It has been stated that computational intensity showed increases that were...
In this Letter, we apply combined linear detector/parallel interference cancellation (PIC) detectors to jointly decode symbols in a multiple access chaotic-sequence spread-spectrum communication...
Complex Behavior of Switching Power Converters (2003)
Chi K. Tse, Senior Member, Di Bernardo
Power electronics circuits are rich in nonlinear dynamics. Their operation is characterized by cyclic switching of circuit topologies, which gives rise to a variety of nonlinear behavior. This paper...
Detecting Determinism in Time Series : The method of Surrogate Data (2003)
Michael Small, Chi K. Tse, Senior Member
Abstract—We review a relatively new statistical test that may be applied to determine whether an observed time series is inconsistent with a specific class of dynamical systems. These surrogate...
Bifurcation analysis is performed to a power-factor-correction (PFC) boost converter to examine the fast-scale instability problem. Computer simulations and analysis reveal the possibility of...
Yufei Zhou, Chi K. Tse, Shui-sheng Qiu
The buck converter has been known to exhibit chaotic behavior in a wide parameter range. In this paper, the resonant parametric perturbation method is applied to control chaos in a voltage-mode...
This paper studies the performance of selected chaos-based systems which share their frequency bands with conventional spread-spectrum systems. Such a scenario may occur in normal practice when...
Octavian Dranga, Chi K. Tse, István Nagy
The aim of the paper is to investigate the bifurcation behavior of the power-factor-correction (PFC) boost converter under a conventional peak current-mode control. The converter is operated in...
Recently, an optimal noncoherent detection technique for chaos-shift-keying digital communication system has been proposed. The computational intensity required, however, increases exponentially with...
In a chaos-shift-keying (CSK) digital communication system, correlators followed by a comparator are typically used for coherent detection of the signal. Such a detection method, however, does not...
A Family of PFC Voltage Regulator Configurations with Reduced Redundant Power Processing (2001)
Abstract—This paper discusses a systematic method for deriving basic converter configurations that achieve power factor correction (PFC) and voltage regulation. The discussion begins with a general...
K. W. Siu, Chi K. Tse, Senior Member, Yim-shu Lee
Abstract — This paper studies a particular single-stage power-factor-correction (PFC) switching regulator employing a discontinuous-conduction-mode (DCM) boost-input cell and a...
Abstract — This paper studies the bifurcation paths exhibited by a simple second-order dc/dc boost converter under currentprogrammed control with and without voltage feedback. Previous work in this...
Determinism in Financial Time Series
The attractive possibility that financial indices may be chaotic has been the subject of much study. In this paper we address two specific questions: "Masked by stochasticity, do financial data...