Showing papers by "University of Macau published in 2000"
TL;DR: In this paper, the authors examined whether organizational socialization content areas are applicable across cultures and found that all four socialization domains played a significant role in predicting satisfaction and commitment, and these socialization measures also were stronger predictors than a variety of demographic measures.
Abstract: This study examined whether organizational socialization content areas are applicable across cultures. Data were gathered from 324 U.S. and 198 Hong Kong employees who completed a questionnaire assessing four socialization content domains (training, understanding of the job, coworker support, and future prospects within the company), five measures of job satisfaction, and three measures of organizational commitment. Based on the merged data from the two cultures, all four socialization domains played a significant role in predicting satisfaction and commitment. These socialization measures also were stronger predictors than a variety of demographic measures. Although there were some differences in the relative strengths of the socialization measures when the data were analyzed separately for each nation, the overall results support the idea that the socialization content areas tested are applicable across cultures. Implications for managing employees in the different cultures are discussed.
65 citations
TL;DR: In this paper, the probability density function (PDF) of the responses of non-linear stochastic system excited by white noise is approximated with the exponential function of polynomial in state variables.
Abstract: The probability density function (PDF) of the responses of non-linear stochastic system excited by white noise is approximated with the exponential function of polynomial in state variables. Special measure is taken to satisfy FPK equation in the weak sense of integration with the assumed PDF. Gaussian closure method is a special case of the proposed method. Examples are given to show the application of the method to the systems with additive random excitations and those with both additive and multiplicative random excitations. The PDFs obtained with the proposed method and conventional Gaussian closure method are compared with obtainable exact ones. Numerical results showed that the PDFs obtained with the proposed method can be very close to the exact ones regardless of the degree of system non-linearity. In some cases, even exact solution can be obtained with the proposed method.
59 citations
TL;DR: An experimental study on the cutting force and the grinding temperature for ceramic face grinding using slotted diamond wheels is presented in this paper, where empirical relationships related with the material removal rate, the surface roughness, the depth of cut, the wheel speed and the grain size are discussed.
39 citations
TL;DR: In this paper, the probability density function of the responses of nonlinear random vibration of a multi-degree-of-freedom system is formulated in the defined domain as an exponential function of polynomials in state variables.
Abstract: The probability density function of the responses of nonlinear random vibration of a multi-degree-of-freedom system is formulated in the defined domain as an exponential function of polynomials in state variables. The probability density function is assumed to be governed by Fokker-Planck-Kolmogorov (FPK) equation. Special measure is taken to satisfy the FPK equation in the average sense of integration with the assumed function and quadratic algebraic equations are obtained for determining the unknown probability density function. Two-degree-of-freedom systems are analyzed with the proposed method to validate the method for nonlinear multi-degree-of-freedom systems. The probability density functions obtained with the proposed method are compared with the obtainable exact and simulated ones. Numerical results showed that the probability density function solutions obtained with the presented method are much closer to the exact and simulated solutions even for highly nonlinear systems with both external and parametric excitations.
27 citations
24 Jul 2000
TL;DR: In this paper, a single-machine infinite-bus system with one static synchronous compensator (STATCOM) asymmetrically installed as a current source is discussed, and a simple power equation is drawn to give direct and clear physical concepts on synchronizing and damping torque coefficients.
Abstract: In this paper, we discuss the single-machine infinite-bus system with one static synchronous compensator (STATCOM) asymmetrically installed as a current source. Together with a classical two order generator model, a simple power equation is drawn to give direct and clear physical concepts on synchronizing and damping torque coefficients. On the basis of the equations, some basic issues, such as the relationship of voltage gain control and damping control, operating conditions and installation of STATCOM, are investigated by detailed theoretical analysis. Then with proportional controller for voltage and damping control, the digital simulation proves the necessity of multi-objective control of STATCOM in damping power system oscillations and supplying fast voltage support. Finally, nonlinear simulation demonstrates how STATCOM improves the power transfer ability of the system after a severe fault.
21 citations
TL;DR: In this article, the probabilistic solution to the stochastic responses of a rigid structure connected to a foundation with Coulomb friction-type base isolation subjected to stationary Gaussian white-noise-type ground excitations is investigated.
20 citations
TL;DR: This article explored elementary school children's geographical and affective location of the self in Japan, Macau and Hong Kong, finding that Japanese children are far less likely than their counterparts in Hong Kong and Macau to locate themselves in an international sphere.
Abstract: In the so-called 'global age', the issue of how children learn to locate themselves in the world is an important one. Working from a foundation of theories related to globalisation, identity development and citizenship education, this paper describes the findings of a research project which explored elementary school children's geographical and affective location of the self in Japan, Macau and Hong Kong. Analysis and discussion of Japanese education policy is then presented in an attempt to explain the finding that Japanese children are far less likely than their counterparts in Hong Kong and Macau to locate themselves in an international sphere.
18 citations
TL;DR: In this article, modified interaction equations based on an analytical study of tee-sections are proposed with improvement over Cheng and Yura's interaction equation for coped steel I-beams.
18 citations
23 Jan 2000
TL;DR: In this article, a unified approach to simplify the traditional distribution system compensators is proposed and investigated, which is a unified device that combines all the individual compensators such as active filters, VAr compensators and uninterruptible power supply (UPS) in order to compensate harmonics, reactive power, asymmetry, voltage variation and power supply interruption.
Abstract: In this paper, a unified approach to simplify the traditional distribution system compensators is proposed and investigated. Distribution System Unified Conditioner (DS-UniCon) is a unified device that combines all the individual compensators such as active filters, VAr compensators and uninterruptible power supply (UPS) in order to compensate harmonics, reactive power, asymmetry, voltage variation and power supply interruption by using state-of-art of power electronics. DS-UniCon offers a higher effective and economic means to improve power quality.
16 citations
01 Mar 2000
TL;DR: The pedagogy of problem-based learning is introduced, together with the evolution of the course content, and issues such as resources and facilities needed for the course, and the students' perceived learning are addressed.
Abstract: This paper describes the curriculum development and teaching experience of a junior core course entitled Software Psychology, offered in the undergraduate Software Engineering program at the author's affiliated university. In particular, the pedagogy of problem-based learning is introduced, together with the evolution of the course content. It will also address issues such as resources and facilities needed for the course, and the students' perceived learning as well as the author's lessons learned therein.
15 citations
TL;DR: This paper proposes improved switched-capacitor interpolators using a novel sampling technique which eliminates the undesired distortion due to the sample-and-hold shaping effect at the lower input sampling rate.
Abstract: This paper proposes improved switched-capacitor (SC) interpolators using a novel sampling technique which eliminates the undesired distortion due to the sample-and-hold shaping effect at the lower input sampling rate. Such a sampling technique not only leads to a precise analog interpolation, as its digital counterpart does, but also allows to simplify the design procedures and resulting SC circuit implementations. Different circuit topologies with both finite- and infinite-impulse response characteristics are developed, respectively, for low- and high-selectivity filtering. Practical implementation issues are discussed with respect to capacitance ratio mismatches, as well as finite gain, bandwidth, and offset sensitivity effects of operational amplifiers. Besides detailed computer-based analyses, experimental results obtained from discrete component prototypes are also presented to demonstrate the proposed circuits.
28 Jun 2000
TL;DR: In this paper, a robust controller for stabilizing an inverted pendulum system by loop shaping design procedure (LSDP) is proposed. But it does not require /spl gamma/-iteration for its solution, and explicit formulas for the corresponding controller are available.
Abstract: Loop shaping design procedure (LSDP) is one of the most promising H/sub /spl infin// design procedure, which incorporates loop shaping methods to obtain performance or robust stability trade-offs. The advantage is that LSDP does not require /spl gamma/-iteration for its solution, and explicit formulas for the corresponding controller are available. Many controllers designed by the method give satisfactory results, such as in aerospace applications. In this paper, we design a robust controller for stabilizing an inverted pendulum system by LSDP. Simulation results show that the designed controller works satisfactorily.
TL;DR: The aim is not restricted to develop one measure more for module coupling, but to clarify confusion on the concept and problems relating to its heuristics, illustrate how to develop rigorously measures based on a clear concept and modeling and finally demonstrate its usefulness.
11 Jun 2000
TL;DR: It was shown that the preconditioners are nonsingular when the BVM is A?, µ-?-stable, and the eigenvalues of preconditionsed matrices are clustered, so the number of iterations for solving the precONDitioned systems by the GMRES method is bounded by a constant that is independent of the discretization mesh.
Abstract: We consider linear constant coefficient differential-algebraic equations (DAEs) Ax?(t) + Bx(t) = f(t) where A, B are square matrices and A is singular. If det(?A + B) with ? ? C is not identically zero, the system of DAEs is solvable and can be separated into two uncoupled subsystems. One of them can be solved analytically and the other one is a system of ordinary differential equations (ODEs). We discretize the ODEs by boundary value methods (BVMs) and solve the linear system by using the generalized minimal residual (GMRES) method with Strang-type block-circulant preconditioners. It was shown that the preconditioners are nonsingular when the BVM is A?, µ-?-stable, and the eigenvalues of preconditioned matrices are clustered. Therefore, the number of iterations for solving the preconditioned systems by the GMRES method is bounded by a constant that is independent of the discretization mesh. Numerical results are also given.
21 Aug 2000
TL;DR: The functional requirements of a Web-based network management and the architecture for Web- based network configuration management, which is capable of controlling and monitoring the configuration information of enterprise networks remotely, are discussed.
Abstract: As the complexity and size of data networks increases, network management faces a great challenge. Fortunately, the emergence of the SNMP (simple network management protocol) management framework and Web technology release network managers from this difficult circumstance. This paper discusses the functional requirements of a Web-based network management and proposes the architecture for Web-based network configuration management, which is capable of controlling and monitoring the configuration information of enterprise networks remotely. The functional modules and the interfaces of the proposed system are discussed in detail.
28 May 2000
TL;DR: An interactive architecture compiler for SC multirate circuits that allows the automated design from frequency specifications to building block implementation, here applied to the design and synthesis of multistage SC decimators is proposed.
Abstract: This paper proposes an interactive architecture compiler for SC multirate circuits that allows the automated design from frequency specifications to building block implementation, here applied to the design and synthesis of multistage SC decimators. The compiler provides a library of different topologies that comprises a few independent multi-decimation building blocks. New building blocks defined by the users are also available for design of a specific stage. A design example of a 7th order SC decimator illustrates the efficient synthesis of the corresponding resulting circuits that achieve the required anti-aliasing amplitude responses with respect to the speed requirements of the operational amplifiers and also the minimum capacitance spread and total capacitor area.
Journal Article•
TL;DR: The systematics of the genus is examined, new species groups are proposed, and a key to subgenera and species groups of Coquillettidia is provided.
Abstract: Coquillettidia (Coquillettidia) crassipes is recorded for the 1st time in the Territory of Macau, southern China. The systematics of the genus is examined, new species groups are proposed, and a key to subgenera and species groups of Coquillettidia is provided.
06 Apr 2000
TL;DR: An ongoing campus-based training experiment based on the Action Learning concept to expose to undergraduate students majoring in Software Engineering, the increasing globalization of electronic commerce, so as to enable them to see through the quality required of today's Information and Communications Technologists (ICT).
Abstract: This paper describes an ongoing campus-based training experiment based on the Action Learning concept [24] to expose to undergraduate students majoring in Software Engineering, the increasing globalization of electronic commerce, so as to enable them to see through the quality required of today's Information and Communications Technologists (ICT). The experiment recruits students on a voluntary basis and covers training in the areas of WWW-based application development, and case studies of business models in electronic commerce. It is also expected that this experiment will lead to the development of special interest groups of students in the different technological and business aspects of the Internet-based organizations.
15 Aug 2000
TL;DR: In this article, a distribution system unified conditioner (DS-UniCon) is proposed to ensure the power quality, reliability, power stabilizer and power flow control/management of power network as well as the electric vehicle charger station at the same time.
Abstract: In this paper, the concept, the proposed scheme and the model of DS-UniCon are described with simulation results to show its validity. The discussion of power flow of DS-UniCon is included to indicate its ability to ensure the power quality, reliability, power stabilizer and power flow control/management of power network as well as the electric vehicle charger station at the same time. The proposed FACTS device, distribution system unified conditioner (DS-UniCon), is a unified approach for all the existing compensators in FACTS devices. It may be installed inside the distribution networks with the insurance of power quality and reliability as well as the power storage control function for electric vehicle charger. The structure of this DS-UniCon model may be considered to form as a unified device to be installed at the interface between transmission side and distribution site to control the power flow and power quality. The economic comparison and power management of a new concept of FRIENDS are also discussed with DS-UniCon.
01 Jan 2000
TL;DR: A new method proposed recently is applied and extended to obtain their approximate probability density function (PDF) solution for the highly nonlinear random MDOF systems which are excited by white noise.
Abstract: The difficulties in obtaining the probability solutions of nonlinear random multi-degree-of-freedom (MDOF) systems are underlined. For the MDOF systems which are excited by white noise, a new method proposed recently is applied and extended to obtain their approximate probability density function (PDF) solution. Numerical results are presented to validate the method for the highly nonlinear random MDOF systems.
01 Jan 2000
TL;DR: The insight into the essence of intelligent control is elucidated, and the perspective application of intelligent methods to the robotics field is presented.
Abstract: In this paper, the essence of intelligent control is elucidated. The intelligent control methods such as Expert System, Neural Network method, Fuzzy Logic method, Neural-Fuzzy method, Hybrid Control method are introduced. The perspective application of intelligent methods to the robotics field is presented at last.
17 Dec 2000
TL;DR: A modular approach for the L-band CMOS Active Inductor is proposed and designed based upon a connection in series of conventional low Q-factor gyrator-C basic cells in order to offer simplicity in terms of pole/zero cancellation.
Abstract: In this paper, a modular approach for the L-band CMOS Active Inductor (AI) is proposed and designed based upon a connection in series of conventional low Q-factor gyrator-C basic cells. The Q-factor can then be tuned by the number of AI cells in order to offer simplicity in terms of pole/zero cancellation, while maintaining in each gyrator-C inductor cell low values of Q. In order to demonstrate the proposed architecture's usefulness, a prototype L-band active inductor is designed in a 0.6 /spl mu/m CMOS process. The simulated results show that a high Q value of 972 is obtained at 2 GHz and an average Q-factor value of 200 is also achieved in the frequency range of 1-2 GHz.
28 Jun 2000
TL;DR: In this article, the concept of personalized intelligent control is illustrated in the balancing of an inverted pendulum system, which is a classic example of an inherently nonlinear unstable system, and the experimental results show the feasibility, effectiveness and robustness of the applied controller.
Abstract: The concept of "personalized intelligent control" is illustrated in this paper. Not based on accurate mathematical model, personified intelligent control method forms control laws directly by means of qualitative analysis and synthesis of the plant. We apply it successfully to balancing of an inverted pendulum system, which is a classic example of an inherently nonlinear unstable system. The experimental results show the feasibility, effectiveness and robustness of the applied controller.
23 Jan 2000
TL;DR: In this article, a new method was proposed for the control of the three-phase tri-level voltage source shunt power quality conditioner, where reference current is calculated under synchronous d-q frame and advanced deadbeat control with voltage space pulse width modulation is used to trace the reference current, and results of computer simulation under MATLAB show good dynamic performance of the proposed scheme to compete the function of compensating harmonics, reactive current and imbalance.
Abstract: Controlling technology is the key problem to realize compensation of power quality with a converter. A new method was proposed for the control of the three-phase tri-level voltage source shunt power quality conditioner. The mathematical model of the tri-level converter is addressed in detail. Reference current is calculated under synchronous d-q frame and advanced deadbeat control with voltage space pulse width modulation is used to trace the reference current. Results of computer simulation under MATLAB show good dynamic performance of the proposed scheme to compete the function of compensating harmonics, reactive current and imbalance.
TL;DR: In this article, counterexamples are given to show that the conjecture is not true when m = 1 or if m=n=2. But this conjecture is valid under more restrictive assumptions.
31 Mar 2000
TL;DR: In this article, aktuellen sozialen and planerischen Probleme infolge von Binnenwanderungen, speziell der starken Migration in die chinesischen Metropolen.
Abstract: . Dieser Artikel untersucht die aktuellen sozialen und planerischen Probleme infolge von Binnenwanderungen, speziell der starken Migration in die chinesischen Metropolen. Am Beispiel einer Stichprobenerhebung aus Peking gibt er einen Einblick in die Sozialstruktur der sogenannten floating population in der chinesischen Hauptstadt. Das Hauptinteresse gilt den Ursachen und Formen der stadtischen Armut und Segregation. Diese werden im allgemeineren Zusammenhang der neuen Armut in den Stadten auch anderenorts und im Zusammenhang mit neuen Strategien der Bevolkerungs-, Wirtschafts- und Stadtentwicklung in China gesehen. Es wird argumentiert, dass Peking und andere grose Zentren Chinas den demographischen Veranderungen durch die gegenwartigen sowie die zu erwartenden Zuwandererstrome nicht gewachsen sind. Dies stellt auch eine Herausforderung an die Entscheidungstrager der Planung dar, ein neues Denken in der Stadt- und Regionalpolitik zu entwikkeln.
TL;DR: In this paper, the authors considered stochastic optimal control problems for a class of reflected diffusion with Poisson jumps in a half-space, and the nonlinear Nisio's semigroup was constructed.
Abstract: Stochastic optimal control problems for a class of reflected diffusion with Poisson jumps in a half-space are considered. The nonlinear Nisio's semigroup for such optimal control problems was constructed. A Hamilton-Jacobi-Bellman equation with the Neumann boundary condition associated with this semigroup was obtained. Then, viscosity solutions of this equation were defined and discussed, and various uniqueness of this equation was also considered. Finally, the value function was such optimal control problems is shown to be a viscosity solution of this equation.
28 May 2000
TL;DR: A novel area-efficient technique including symmetrical-coefficient-sharing and spread-reduction is proposed in this transversal SC circuit embedding minimized mismatch-free analog delay lines with accurate, wideband gain- and offset-compensation.
Abstract: This paper proposes a 4-fold multistage Switched-Capacitor (SC) interpolation filter with 5 MHz passband and 54 MHz output sampling rate for NTSC/PAL digital video signal processing systems. The circuit implements an impulse sampled halfband interpolation with 23- and 7-tap FIR filtering in 1stand 2nd-stage respectively for achieving a linear-phase response. A novel area-efficient technique including symmetrical-coefficient-sharing and spread-reduction is proposed in this transversal SC circuit embedding minimized mismatch-free analog delay lines with accurate, wideband gain- and offset-compensation. This filter is designed with optimized speed of the analog components in 0.35 /spl mu/m CMOS technology and expected to consume about 2 mm/sup 2/ active area and 90 mW at 3.0 V supply.
Journal Article•
TL;DR: In this paper, the authors developed a general -equilibrium model to explain the emergence of multinational enterprise from trade-offs between transaction costs and the economies of specialization, and showed that even without structural market distortions, the activities of multinational enterprises still occur wherever there are transaction gains from the common governance of activities in different locations.
Abstract: This paper develops a general -equilibrium model to ex plain the emergence of multinational enterprise s from the trade -offs between transaction costs and the economies of specialization . After management specialist s’ real incomes from domestic production, domestic licensing, export, international licensing and international production have been derived in a unifying framework, the emergence of multinational enterprise s can be explained endogenously. Inframarginal analysis (total cost -benefit analysis across corner solutions in addition to marginal analysis of e ach corner solution) of the model shows that, even without structural market distortions, the activities of multinational enterprise s still occur wherever there are transaction gains from the common governance of activities in different locations.
17 Dec 2000
TL;DR: A novel linear predictive method (SELP) for speech spectra modelling is proposed which allows one to develop an all-pole filter which combines p+1 consecutive even preceding samples of the speech signal x(n) into p pairs for linear extrapolation.
Abstract: In this paper, a novel linear predictive method (SELP) for speech spectra modelling is proposed. This method allows one to develop an all-pole filter which combines p+1 consecutive even preceding samples of the speech signal x(n) into p pairs for linear extrapolation. In addition, a weighting selective scheme is employed to obtain high signal-to-error ratio (SER). Comparing to the traditional LPC modelling, the proposed filter's order is then raised to 2p+2 when both filters are with p-normal equations. In order to demonstrate the proposed method usefulness, this new model is simulated at 22.05 kHz speech spectra. Experimental results show that at least 10 dB SER improvement is obtained with p=5 when compared with that of LPC modelling.