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International Symposium on Integrated Circuits (ISIC)

作者： Sha Luo Chirn Chye Boon Lei Zhu Manh Anh Do Aaron V. Do Deparment of Electrical and Computer Engineering National University of Singapore Singapore Analog Design Department Marvell Asia Pte Ltd Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore

A stub-loaded dual-mode ring resonator is proposed to design a millimeter-wave bandpass filter using 0.18-μm CMOS Technology. By increasing the length of the open-circuited stub at the inner corner of the ring resonator, the even-mode resonant frequency is moved to a lower frequency to separate it from the odd-mode resonant frequency. Therefore, the center frequency of the passband has been shifted to a lower frequency to achieve a reduced-size filter design. At the same time, an additional transmission zero is brought in at the upper stopband that can be adjusted by the length of the stub as well. Finally, a 60 GHz bandpass filter is fabricated and characterized. The filter has achieved an ultra-compact size of 0.092 × 0.56 mm. The measured results show good passband performance with two visible transmission poles and three transmission zeros thereby verifying the design principle.

关键词： Band pass filters Filtering theory Resonator filters Optical ring resonators Resonant frequency Passband CMOS integrated circuits

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Automatic generation of transducer models for multicore system design

Automatic generation of transducer models for multicore syst...

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IEEE International High-Level design Validation and Test Workshop

作者： Hansu Cho Samar Abdi Design Solution Laboratory DMC Research and Development Center Samsung Electronics Limited Suwon South Korea Department of Electrical and Computer Engineering Concordia University Montreal Canada

This paper presents methods for automatic generation of synthesizable models of Transducer, a highly flexible communication module for interfacing multicore system components. We describe the transducer architecture, comprising the bus interface, high-level communication controllers and buffer management blocks. The well defined architecture and model semantics of the transducer enable its automatic generation. Moreover, the simple interface of the transducer provides for a well defined software interface, making it easy to update the software after changes in multicore system architecture. Our experimental results show that in multicore system design for large applications such as MP3 decoder and JPEG encoder, automatic transducer generation provides productivity gains of 9-23X due to significant savings in communication model development. On the quality axis, we show that multicore communication design using automatically generated transducers has only a 9% overhead in communication delay over a fully-connected point-to-point communication architecture.

关键词： Transducers Program processors Multicore processing Registers Protocols

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Nano Superlattice-like Materials as Thermal Insulators for Phase-Change Random Access Memory

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MRS Online Proceedings Library 2011年第1期1404卷 84-89页

作者： Loke, D. Shi, L. P. Wang, W. J. Zhao, R. Ng, L. T. Lim, K. G. Yang, H. X. Chong, T. C. Yeo, Y. C. NUS Graduate School for Integrative Sciences & Engineering 28 Medical Drive Centre for Life Sciences #05-01 Singapore Data Storage Institute Singapore Singapore University of Technology & Design Singapore Department of Electrical & Computer Engineering National University of Singapore Singapore

Nanoscale superlattice-like (SLL) dielectric was employed to reduce the power consumption of the Phase-change random access memory (PCRAM) cells. In this study, we have simulated and found that the cells with the SLL dielectric have a higher peak temperature compared to that of the cells with the SiO2 dielectric after constant pulse activation, due to the interface scattering mechanism. Scaling of the SLL dielectric has resulted in higher peak temperatures, which can be even higher after material/structural modifications. Furthermore, the SLL dielectric has good material properties that enable the cells to have high endurance. This shows the effectiveness of the SLL dielectric for advanced memory applications.

关键词： devices dielectric thermal conductivity

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Three finite-element time-domain-based numerical algorithms for high-frequency broadband PCB simulations

Three finite-element time-domain-based numerical algorithms ...

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IEEE Topical Meeting on Electrical Performance of Electronic Packaging (EPEPS)

作者： Xiaolei Li Jian-Ming Jin Jilin Tan Center of Computational Electromagnetics Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Cadence Design Systems Inc. Chelmsford MA USA

As the operating frequency and integration level of integrated circuits (IC) increase, full-wave analysis algorithms are needed to accurately simulate the arising electromagnetic phenomena. The finite-element time-domain (FETD) method has become an attractive candidate for this simulation due to its advantages in modeling complex geometries and materials, conducting transient analyses, and performing broadband characterizations. Three FETD-based numerical algorithms, including the original FETD method, the dual-field domain decomposition (DFDD) method, and the discontinuous Galerkin time-domain (DGTD) method, are investigated and applied to the simulation of printed circuit board (PCB) structures to demonstrate their accuracies and capabilities.

关键词： Finite element methods Time domain analysis Integrated circuit modeling Mathematical model Equations Analytical models

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Teaching computational thinking to non-computing majors using spreadsheet functions

Teaching computational thinking to non-computing majors usin...

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Frontiers in Education (FIE) Conference

作者： Kuo-Chuan Yeh Ying Xie Fengfeng Ke Department of Computer Science and Engineering The Pennsylvania State University USA Department of Educational Leadership and Instructional Design Idaho State University USA Department of Educational Psychology and Learning Systems The Florida State University USA

Recently, higher education has seen an increasing emphasis on the prominent role of computational thinking in all disciplines. Computational thinking is advocated as not only a fundamental skill or concept in computer science but also a core competency for all disciplines. Teaching students in non-computer science majors computing thinking is challenging because students do not have experts' mental models. This study investigates the knowledge gap that non-computing major college students (n=126) possess about computational thinking in an introductory MS Excel course by measuring their performance using spreadsheet functions in three categories: recall, application, and problem solving. The empirical result, analyzed using ANOVA, shows that students can recall the meaning of those functions but seem to have trouble using them correctly and precisely (cued or uncued). Students' test results suggest the following issues: (1) problems with understanding the data type, (2) failure in translating problems to productive representations using spreadsheet functions, and (3) inadequate stipulation of the computational representations in precise forms. Addressing these problems early and explicitly in future classes could improve the education of computational thinking and alleviate difficulties students may experience in using computational thinking in learning and problem solving.

关键词： Problem-solving computer science computers Conferences Educational institutions Instruments

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Impact of antenna selection on cognitive radio system capacity

Impact of antenna selection on cognitive radio system capaci...

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International Conference on Cognitive Radio Oriented Wireless Networks and Communications

作者： Pawel A. Dmochowski Peter J. Smith Mansoor Shafi Himal A. Suraweera School of Engineering and Computer Science Victoria University of Wellington Wellington New Zealand Department of Electrical and Computer Engineering University of Canterbury Christchurch New Zealand Telecom New Zealand Wellington New Zealand Engineering Product Development Singapore University of Technology and Design Singapore

We examine the effect of transmit antenna selection on the secondary user (SU) and primary user (PU) capacity in a multiple-input single-output cognitive radio system. We consider antenna selection with the aim of improving SU and PU capacity and mitigating the effects of incomplete channel knowledge by the SU. Under a minimum PU signal-to-interference-and-noise ratio constraint, analytical and semi-analytical expressions for the permissible SU transmit power are derived, which are used in obtaining capacity cumulative distribution functions by means of simulations. We show that PU antenna selection is effective at reducing the SU blocking probability, the probability that it cannot transmit, while SU antenna selection leads to significant gains in its capacity. Antenna selection at the SU is also shown to effectively compensate for incomplete channel knowledge and can be used to achieve moderate improvements in PU capacity.

关键词： Interference Signal to noise ratio Transmitting antennas Cognitive radio Capacity planning Filtering theory

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A Small-Gain Methodology for Networks of iISS Retarded Systems based on Lyapunov-Krasovskii Functionals

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IFAC Proceedings Volumes 2011年第1期44卷 5100-5105页

作者： Hiroshi Ito Zhong-Ping Jiang Pierdomenico Pepe Department of Systems Design and Informatics Kyushu Institute of Technology Iizuka Fukuoka 820-8502 Japan Department of Electrical and Computer Engineering Polytechnic Institute of New York University Brooklyn NY 11201 USA Department of Electrical and Information Engineering University of L'Aquila 67040 Poggio di Roio L'Aquila Italy

Abstract A problem of assessing stability of retarded dynamical networks is solved in this paper. Subsystems are assumed to be integral input-to-state stable (iISS). Time-delays are allowed to reside in both subsystems and interconnection channels, and may be both discrete and distributed. No assumption is made on the interconnection topology. This paper develops a small-gain methodology for constructing a Lyapunov-Krasovskii functional of such a network.

关键词： Time delay Large-scale systems Nonlinear systems Lyapunov-Krasovskii functionals Integral input-to-state stability (iISS)

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Ant-inspired search techniques for solving the zero-one knapsack problem with multiple constraints

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International Journal of Advancements in Computing Technology 2011年第4期3卷 242-255页

作者： Chiang, Chuan-Wen Huang, Yu-Qing Lu, Guo-Qin Lin, Shou-Sheu Department of Computer and Communication Engineering National Kaohsiung First University of Science and Technology Taiwan Institute of Engineering Science and Technology National Kaohsiung First University of Science and Technology Taiwan Planning and Design Division Southern District Branch Chunghwa Telecommunication Taiwan

In this paper, we consider the multidimensional zero-one knapsack problem (0-1 MKP). The objective of the problem is to find a subset of objects that yields maximum profit without violating knapsack constraints. The 0-1 MKP is known to be NP-hard. Due to the intractability of the problem, numerous research efforts have focused on various approximation algorithms to acquire satisfactory suboptimal solutions within a reasonable amount of computation cost. However, most realistic approaches for solving the 0-1 MKP still remain to be improved. On the basis of ant colony optimization, we therefore propose a novel constructive algorithm. The proposed algorithm, namely AST-MKP, adopts a new type of constructive graph for leading artificial ants in making decisions to select effective solution components. Moreover, we also devise a local search scheme to advance the quality of solutions obtained. The performance of the AST-MKP algorithm is demonstrated by comparing it against other existing algorithms in terms of overall profit for a set of problem instances obtained form the OR-Library. Experimental results indicate that the algorithm proposed here performs significantly better than the competitive approaches.

关键词： Ant colony optimization

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Capacity of Multicarrier Multilayer Broadcast and Unicast Hybrid Cellular System with Independent Channel Coding over Subcarriers

Capacity of Multicarrier Multilayer Broadcast and Unicast Hy...

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IEEE Conference on Vehicular Technology (VTC)

作者： Siqian Liu Hongxiang Li Guanying Ru Weiyao Lin Lingjia Liu Yang Yi Electrical and Computer Engineering Department North Dakota State University USA Electrical and Computer Engineering Department University of Louisville USA Institute of Image Communication and Information Processing Shanghai Jiao Tong University China Electrical Engineering and Computer Science Department University of Kansas Lawrence KS USA Technology Design Integration Department Texas Instruments Inc. Dallas TX USA

In this paper, we discuss the hybrid capacity region of a generic multicarrier multilayer broadcast and unicast cellular system with independent channel coding over subcarriers. In particular, we analytically derive the capacity region and provide conditions to achieve its boundary. The simulation results show that the hybrid capacity regions are considerably higher than those of the traditional time division multiplexing scheme.

关键词： Unicast HDTV Broadcasting Simulation Time division multiplexing USA Councils

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A comparison of two latency insertion methods in dependent sources applications

A comparison of two latency insertion methods in dependent s...

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IEEE Topical Meeting on Electrical Performance of Electronic Packaging (EPEPS)

作者： Ping Liu Jilin Tan Zhongyong Zhou José Schutt-Ainé Patrick Goh PCB System Division Cadence Design System Inc Shanghai China Chelmsford MA USA Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA

This paper compares two different formulations of the latency insertion method (LIM) for the analysis of circuits with dependent sources. One is the scalar LIM and the other is the amplification matrix LIM. Numerical experiments demonstrate that the scalar LIM necessitates much smaller time step than the amplification matrix LIM when handling certain types of dependent sources indicating better performance of the latter technique without a sacrifice in accuracy.

关键词： Voltage control Stability analysis Mathematical model Equations Integrated circuit modeling Time domain analysis Circuit stability

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