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IS and T's NIP17: International Conference on Digital Printing Technologies

作者： Chen, Cheng-Lun Chiu, George T.-C. Allebach, Jan P. School of Mechanical Engineering Purdue University West Lafayette IN Sch. of Elec./Computer Engineering Purdue University West Lafayette IN

This paper proposed a new process control strategy for reducing banding artifacts in elec.rophotographic (EP) processes. EP banding artifact is shown to correlate to the fluctuation of the organic photoconductive (OPC) drum angular velocity. Improved regulation of the OPC drum rotational velocity under various process uncertainty and variations will significantly improve EP process stability and reduce the appearance of banding. The proposed control strategy includes two levels of OPC drum speed regulation. The first level utilizes a loop shaping technique to incorporate a human visual system (HVS) model into the control loop to eliminate low frequency and non-periodic drum velocity fluctuation. The second level uses an internal model based repetitive controller to reduce the effect of periodic velocity fluctuations. The HVS based loop shaping design is intended to address the subjective evaluation of printing process by incorporating human visual perception into EP process control. Experimental verification on a typical low cost 600-dpi EP engine showed significant banding reduction for spatial frequency up to 70 cycles per inch.

关键词： Photography

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Resource management in power-controlled cellular wireless systems

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Wireless Communications and Mobile Computing 2001年第2期1卷 185-199页

作者： Xiao, Mingbo Shroff, Ness B. Chong, Edwin K. P. Sch. of Elec. and Comp. Engineering Purdue University West Lafayette IN 47907-1285 United States Sch. of Elec. and Comp. Engineering 1285 EE Building Purdue University West Lafayette IN 47907-1285 United States Petroleum University Dongying China Shanghai Jiao Tong University Shanghai China Sch. of Elec. and Comp. Engineering Purdue University United States University of Southern California United States University of Pennsylvania United States Columbia University United States Sch. of Elec. and Comp. Engineering Purdue University United States AT and T Bell Labs Bell Communications Research United States National Science Foundation United States University of Adelaide SA Australia Princeton University United States

The efficient management of wireless resource is essential to the success of wireless systems. While power control is traditionally considered as a means to counteract the detrimental effects of channel fading, it is also a flexible mechanism to provide Quality of Service to individual users, and can be used as a platform for radio resource management. In this paper, we review the developments of distributed power control and related resource management problems in cellular wireless systems. We highlight the feasibility issue in a power-controlled system, which enables us to push the system toward high efficiency, and prevent the system from collapsing at the same time. Considering the unique features of multimedia traffic to be supported in future wireless systems, we also review power and rate control sch.mes proposed for wireless data, and present a framework for utility-based power control as a possible candidate for distributed power control of multimedia wireless systems. Copyright © 2001 John Wiley and Sons, Ltd.

关键词： power control admission control channel allocation rate control signal‐to‐interference ratio cellular system wireless resource management

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A review of laminar single-phase flow in microchannels

A review of laminar single-phase flow in microchannels

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2001 ASME International Mechanical engineering Congress and Exposition

作者： Papautsky, Ian Ameel, Tim Frazier, A. Bruno Dept. of Electrical Engineering University of Cincinnati Department of Mechanical Engineering University of Utah Sch. of Elec./Computer Engineering Georgia Institute of Technology

ISBN: (纸本)0791835553

Microfluidics plays a major role in the development of many innovative research activities aimed at the development of miniaturized devices and systems, and new applications related to microscale handling of fluids. As the field of microfluidics continues to grow, it is becoming increasingly important to understand the mechanisms and fundamental differences involved in microscale fluid flow. This paper presents a summary of the experimental research efforts in the area of microscale single-phase internal fluid flow and discusses issues associated with investigating microscale flows. While the currently available experimental data indicate the presence of microscale phenomena, they do not unequivocally identify the effects. There is a clear need for additional experimental investigations.

关键词： Laminar flow

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Design, fabrication, measurement and modeling of embedded inductors in laminate technology

Design, fabrication, measurement and modeling of embedded in...

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Pacific Rim/International, Intersociety elec.ronic Packaging Technical/Business Conference and Exhibition

作者： Min, Sung-Hwan Lee, Seock Hee Kim, Woopoung Dalmia, Sidharth Swaminathan, Madhavan Liu, Fuhan Tummala, Rao R. Sch. of Elec./Computer Engineering Packaging Research Center Georgia Institute of Technology 777 Atlantic Drive Atlanta GA 30332-0250

ISBN: (纸本)0791835405

In this paper, several planar embedded inductors whose measured quality factors range from 20 to 90 were characterized in the frequency domain. The inductors were designed on FR-4 board using MCM-L technology with two metal layers and measured using TDR (Time Domain Reflectometry). Using the scattering parameters extracted from TDR measurements, scalable models were developed using the multidimensional cauchy method. A selec.ive sampling algorithm was also investigated for developing the scalable models using elec.romagnetic (EM) simulation.

关键词： elec.ric inductors

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An efficient TCP mechanism for mobile IP handoffs

An efficient TCP mechanism for mobile IP handoffs

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IEEE Region 10 International Conference on elec.rical and elec.ronic Technology

作者： Kwon, Jae-Woo Park, Hee-Dong Cho, You-Ze Sch. of Elec. Eng./Computer Science Kyungpook National University Taegu 702-701 Korea Republic of Department of Computer Engineering Pohang College Pohang 791-711 Korea Republic of

ISBN: (纸本)0780371011

When using TCP over a mobile network, TCP responds to a handoff by invoking a congestion control algorithm, thereby resulting in a degraded end-to-end performance in a mobile network. Furthermore, in Mobile IP handoffs, packets can be lost during movement detection and registration. These packet losses result in long communication pauses, and successive timeouts. Accordingly, to reduce packet losses during handoffs, two sch.mes are proposed, TCP-MD and TCP-R. TCP-MD can detect the movement of a mobile host early on, whereas TCP-R can force the source to freeze data transmission during registration. The proposed sch.mes maintain end-to-end TCP semantics, making it possible to fully interoperate with the existing infrastructure. Only a small change is required in the mobile host, plus the implementation is simple because some Mobile IP messages are used to notify the handoff, eliminating the need for any additional messages. Simulations confirmed that the proposed sch.mes can give an excellent performance in an environment where the mobile host experiences frequent handoffs.

关键词： Network protocols

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A fax adapter for Internet fax-to-fax communication

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International Journal of computers and Applications 2001年第1期23卷 60-67页

作者： Jin, K. Yeo, C.K. Hui, S.C. Soon, I.Y. School of Computer Engineering Sch. of Elec. and Elec. Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore

In order to facilitate Internet fax-to-fax communication, an Internet fax adapter (IFA) is designed to provide a seamless interface for traditional fax users to do Internet faxing without changing the mode of faxing operations they are familiar with. The IFA is designed to be inserted between the fax machine and the telephone line socket. It routes fax messages to an Internet fax gateway and captures the destination fax number without user intervention. The user simply needs to operate the fax machine normally by keying in the destination fax number and then feeding in the documents to be faxed. The entire process of routing the fax through the Internet is thus transparent.

关键词： Facsimile

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Erlang Capacity of a Voice/Data Cellular CDMA Uplink System Using Prioritized Admission Control and Adaptive Power Control

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International Journal of Wireless Information Networks 2001年第1期8卷 1-14页

作者： Ding, Ling Lehnert, James S. Sch. of Elec. and Comp. Engineering Purdue University 1285 Electrical Engineering Building West Lafayette IN United States University of Illinois Urbana-Champaign IL United States Coordinated Science Laboratory University of Illinois Urbana IL United States

A CDMA uplink system that carries both voice and data traffic is investigated. The reservation-based admission control sch.me is used to prioritize voice mobiles, and the truncated channel inversion power control sch.me is used by data mobiles to improve system capacity. The performance of the system is measured by the Erlang capacity. Two methods of determining the Erlang capacity are presented. The first method decouples the analysis of blocking and outage performance, thus simplifying numerical search. The second method takes into account the impact of mobile traffic fluctuations on interference statistics, and thus yields more accurate results. Numerical results are provided that show significant differences between the two methods. Finally, the Erlang capacities of the system are compared for different power control sch.mes.

关键词： Cellular networks Code division multiple access Erlang capacity Queueing analysis Voice/data traffic

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Comparison of RNS and optimized FIR digital filters in Xilinx FPGA's

Comparison of RNS and optimized FIR digital filters in Xilin...

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2001 Midwest Symposium on Circuits and Systems (MWSCAS 2001)

作者： Kaluri, Kadambari Leong, Wen Fung Tan, Kah-Howe Johnson, Louis Soderstrand, Michael Sch. of Elec. and Computer Eng. Oklahoma State University Room 202 Engineering South Stillwater OK 74078 United States

Highly efficient implementations of FIR digital filters in Xilinx Virtex FPGA's are possible by using scaling, order augmentation and optimized CSD techniques for fixed coefficient multipliers. Addition of Residue Number System (RNS) arithmetic techniques to this approach results in further reduction in FPGA resources particularly when large input and output word lengths are required. RNS is particularly attractive when key operations can be carried out with Look-Up-Table (LUT) techniques using either the block or distributed RAM's in FPGA's or the small LUT's available in each CLB of the Xilinx Virtex FPGA's.

关键词： FIR filters

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Online DSP education: DSP for practicing engineers

Online DSP education: DSP for practicing engineers

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Jackson, Joel R. Barnwell, Thomas P. sch.fer, Ronald W. Williams, Douglas B. Hayes III, Monson H. Anderson, David V. Georgia Institute of Technology Department of Computer Engineering Georgia Tech Reg. Eng. Program Georgia Tech Acoustics Research Department Bell Laboratories Sch. of Elec. and Comp. Engineering Georgia Institute of Technology

This paper discusses a new approach to DSP education for practicing engineers. At Georgia Tech we have embarked on a program to merge the comprehensive nature of traditional university courses with the accessibility of network-based training to make graduate and continuing education courses accessible to both traditional students and practicing engineers in remote locations. Many of the practical problems of Internet-based courses have been addressed by using a hybrid course organization and delivery mechanism that combines the flexibility and control of a course delivered from a dentral server with the high media quality of locally delivered high-bandwidth video and audio. In addition to adapting the delivery method, we have worked with both academic faculty and industry representatives to modify existing course materials and develop special-purpose materials to fit the revised requirements of remote delivery to an audience of nontraditional students. Multiple faculty members participated in creating lecture materials to provide a unique perspective on DSP education. The course is comprised of three interconnected tracks: DSP system theory, real-time implementation principles, and laboratory exercises. The theory and real-time principles are presented in short lecture modules like the one shown below, while the laboratory exercises are performed using a DSP development board attached to the student's local computer. The use of a physical development board allows more realistic laboratory exercises to be performed than would a network-based simulation tool. Student interaction, instructor feedback, and course organization are provided through the web interface. The student interaction and hands-on aspects of the course more closely approximate a university experience rather than a typical asynchronous web-based training course.

关键词： engineering education

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CMYK halftoning algorithm based on direct binary search

CMYK halftoning algorithm based on direct binary search

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Final Program and Proceedings of the 9th IS and T/SID Color Imaging Conference: Color science, Systems and Applications

作者： Lee, Je-Ho Allebach, Jan P. Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907-1285 United States Hewlett-Packard Company 18110 SE 34th Street Vancouver WA 98607 United States

In this paper, we propose color design criteria for uniform color textures, and present a new colorant-based halftoning technique which meets these criteria, and hence generates high quality color halftones. The basic idea behind our halftoning method is to control the quality of each colorant texture separately along with the total dot distribution. In order to achieve this, we first set the total dot arrangement and then color the dots optimally without altering the total dot arrangement. This corresponds to a constrained optimization problem, and we solve this via the swap-only direct binary search (DBS) heuristic. Examples of color halftone images using our technique are compared to images obtained by a plane-independent color halftoning algorithm and by the HP 970 Cx inkjet printer driver.

关键词： Color image processing

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