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Custom Integrated Circuits Conference (CICC)

作者： Toshikazu Suzuki Hiroyuki Yamauchi Katsuji Satomi Hironori Akamatsu Corporate System LSI Div. Matsushita Electric Industrial Co. Ltd. Nagaokakyo Japan Corporate System LSI Div. Semiconductor Company Matsushita Electric Industrial Co. Ltd. 1 Kotari-yakemachi Nagaokakyo Kyoto Japan Faculty of Information Engineering Dept. of Computer Science and Engineering Fukuoka Institute of Technology Wajiro-Higashi Higashi-ku Fukuoka Japan

The logic operating voltage is required to suppress for the battery-operated slow application, while the minimum operating voltage of SRAM increase due to the increase in the random threshold-voltage (Vt) fluctuation of the cell transistor (Tr) and the memory capacitance embedded in SoCs with scaling. To suppress the random Vt fluctuation and to guarantee the stable operation over the large memory capacitance at low voltage, a reduced-Vt (LVt) SRAM cell has been proposed. The random Vt fluctuation was suppressed by the proposed LVt cell (Vt=150mV) and increase the static noise margin (SNM) for the data-retention at low voltage compared with conventional higher Vt cell (Vt=300mV). Another unique disturb-free biasing scheme has also been proposed to cancel the substantial trade-off relationship between SNM and the write margin (WRTM) of SRAM cell. With a 45-nm CMOS technology, these proposed techniques improved the SNM over 6-σ random Vt fluctuation with the 0.5-V data-retention voltage and the 0.7-V logic bias voltage. Operating current was reduced by 31% at 32-Kbit SRAM module.

关键词： Random access memory Fluctuations Capacitance Stability Flip-flops Low voltage CMOS technology CMOS logic circuits Large scale integration computer science

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Learning environment for designing physics experiment: DEEP

Learning environment for designing physics experiment: DEEP

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14th International Conference on computers in Education, ICCE 2006

作者： Toumoto, Takahito Horiguchi, Tomoya Hirashima, Tsukasa Takeuchi, Akira Faculty of Engineering Hiroshima University Japan Faculty of Computer Science and Systems Engineering Kobe University Japan Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Japan

In this paper, we explain the importance of the task to design physics experiment in learning of physics. The design and development of a learning environment that supports a learner to design physics experiments, whi... 详细信息

ISBN: (纸本)9781586036874

关键词： E-learning

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Grain refinement of commercial Al-Mg alloy using severe torsion straining process

Grain refinement of commercial Al-Mg alloy using severe tors...

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3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3

作者： Neishi, Koji Higashino, Akihiko Miyahara, Yuichi Nakamura, Katsuaki Kaneko, Kenji Nakagaki, Michihiko Horita, Zenji Department of Materials Science and Engineering Faculty of Engineering Kyushu University Fukuoka 812-8581 Japan User Science Institute Kyushu University Fukuoka 812-8581 Japan Department of Mechanical System Engineering Kyushu Institute of Technology lizuka Fukuoka 820-8502 Japan

ISBN: (纸本)0878499857

Severe plastic deformation (SPD) makes it possible to refine grain size in many metallic materials. Recently, we have developed a new SPD process designated the severe torsion straining process (STSP). This process requires no die but one side of a rod is rotated with respect to the other while producing a local heated zone in the rod and cooling both sides of the heated zone. Torsion strain is then introduced in the local heated zone. The STSP can be a continuous process because the rod is moved in the longitudinal direction while introducing torsion strain through the rotation. For grain refinement using the STSP, various factors may affect, which are the rotation speed, moving speed, straining temperature, cooling rate and diameter of the rod. In this study, the STSP is applied to grain refinement of an A5056 Al-Mg commercial alloy and the factors affecting the grain refinement are optimized. STSP was conducted at a temperature in the range from 573K to 723K. Microstracture was observed by optical microscopy, scanning electron microscopy with an orientation imaging system, and transmission electron microscopy. Microscopy observations revealed that the grain size was reduced to ∼0.9 um, when STSP was conducted at 573K with a rotation speed of 10 rpm and moving speed of 50 mm/min. There is a critical ratio of rotation speed to moving speed above which the rod breaks. The grain size tends to be finer as the straining temperature is lower, the cooling rate is faster and the ratio of rotation speed to moving speed is closer to the critical value.

关键词： Aluminum alloys

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Model following control with a sliding mode adjustment for a positioning system

Model following control with a sliding mode adjustment for a...

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2006 SICE-ICASE International Joint Conference

作者： Shichijo, Miki Oguro, Ryuichi Faculty of Computer Science and Systems Engineering Kyushu Institute Technology 684-4 Kawazu Ilzuka-city Fukuoka 820-8502 Japan

ISBN: (纸本)8995003855

A model based control is known well as an efficient method for the positioning control of mechanical systems. So, the model following control is used to generally recognize as a high performance positioning. But, ordinary there are several modeling errors existing between a numerical model and a real system. These modeling errors are the major factor which makes the degradation of the positioning performance. In this paper, we propose an efficient control method with a sliding mode technique. The proposal method makes the response of the real system follows the model precisely even if the modeling errors exist in the moment of inertia. © 2006 ICASE.

关键词： Sliding mode control

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Barcode technology in blood bank information systems: Upgrade and its impact

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Journal of Medical systems 2006年第6期30卷 449-457页

作者： Li, Bing Nan Chao, Sam Dong, Ming Chui Institute of System and Computer Engineering of Macau University of Macau Taipa 1356 Block 3 1/F Macao Department of Electrical and Electronics Engineering Faculty of Science and Technology University of Macau Taipa Macao

This paper desires to explore the role of barcode technology in blood bank information systems via addressing its upgrade and the consequent impact. Firstly, it briefs the application and effect of barcode technology in blood donation and transfusion service. In the second, the barcode paradigms of Macau Codabar and ISBT 128 are carefully examined and compared in accordance with the procedure and specifications of barcode upgrade. Then, the impact due to upgrade is assessed from the perspectives of blood bank information system, blood banks, and even blood donation and transfusion service. It finally discusses the considerations on implementing the upgrade of barcode technology in blood bank information systems. © 2006 Springer science+Business Media, Inc.

关键词： Barcode label Blood bank Codabar Information system ISBT 128

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Discerliability functions and minimal rules in non-deterministic information systems

Discerliability functions and minimal rules in non-determini...

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High-Power Diode Laser technology and Applications IV

作者： Sakai, Hiroshi Nakata, Michinori Department of Mathematics and Computer Aided Science Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804 Japan Faculty of Management and Information Science Josai International University Gumyo Togane Chiba 283 Japan

ISBN: (纸本)0819461466

Minimal rule generation in Non-deterministic Information systems (NISs), which follows rough sets based rule generation in Deterministic Information systems (DISs), is presented. According to certain rules and possible rules in NISs, minimal certain rules and minimal possible rules are defined. Discernibility functions are also introduced into NISs for generating minimal certain rules. Like minimal rule generation in DISs, the condition part of a minimal certain rule is given as a solution of an introduced discernibility function. As for generating minimal possible rules, there may be lots of discernibility functions to be solved. So, an algorithm based on an order of attributes is proposed. A tool, which generates minimal certain and minimal possible rules, has also been implemented. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Rough set theory

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The Control Method of A Virtual Contact Feeling system

The Control Method of A Virtual Contact Feeling System

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SICE Annual Conference

作者： Takashi Yoshimura Ryuichi Oguro Department of System Innovation and Informatics Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

In this paper, we propose a new system that conveys the virtual contact feeling to people. Virtually, we make the real contact feeling that they touch the tip of their finger to the object. As the friction exits between the tip of their finger and the object, we make the friction, and will be able to consummate the virtual contact feeling. Nowadays, only the visual information of the object is conveyed to the user on the screen on Web. By this technique, not only the visual information of the object but also the real contact feeling will be able to be conveyed to the user in the near future. And, we think that even use as a training system for the medical treatment and use as the braille system which even visual disability people can use the Internet. The real contact feeling of the object needs comparatively high frequency. Then, first of all, we focus the real contact feeling that is made from low frequency. At present, we study to make the real contact feeling without friction

关键词： Control systems Friction Fingers Corrugated surfaces Springs Force control Rough surfaces Surface roughness Frequency Shafts

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Evaluating the Impact of Fault Recovery on Superscalar Processor Performance

Evaluating the Impact of Fault Recovery on Superscalar Proce...

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Pacific Rim International Symposium on Dependable Computing

作者： Toshinori Sato Akihiro Chiyonobu System LSI Research Center Kyushu University Japan Graduate School of Computer Science and System Engineering Kyushu Institute of Technology Japan

Current semiconductor technologies have become susceptible to high-energy neutrons from space. Following the trends in smaller transistors, lower supply voltage, and higher clock frequency, current microprocessors are susceptible to soft errors, which constitute the vast majority of hardware failures. Based on these trends, it is expected that the quality with respect to reliability becomes important as well as performance for microprocessors. In light of this, a lot of fault-tolerance microarchitectures are recently proposed. These studies mainly focus on detecting transient faults, and hence almost every previous study evaluated processor performance in the absence of faults. This analysis only presents the performance impact of constraints introduced by fault detection mechanism. One of the reasons why this evaluation methodology is widely selected is that faults are expected to be rare enough that the overall performance is determined by fault-free behavior. However, evaluating recovery cost of fault tolerant execution is also important, because it is predicted that transient hardware faults occur more frequently as semiconductor technology is improved. Therefore, this paper focuses on recovery from faults

关键词： Space technology Microprocessors Hardware Fault tolerance Fault detection Neutrons Voltage Clocks Frequency Microarchitecture

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Detection of 3-D Feature Points by Using Multiresolution Surface Model

Detection of 3-D Feature Points by Using Multiresolution Sur...

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SICE Annual Conference

作者： Makoto Maeda Kousuke Kumamaru Katsuhiro Inoue Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

Geometric hashing method is the efficient technique to realize the matching based on feature points. Since the performance of the method, however, depends on the accuracy of the detection of feature points, a method for detecting feature points of a 3D object is proposed in this paper. The feature points that are the local maxima of Gaussian curvatures can be obtained by using a multiresolution surface model that can reconstruct NURBS surface model at an arbitrary resolution level. The experiments indicate that the level of the surface model has to be determined appropriately to obtain the desirable number of feature points. Therefore the proposed method is demonstrated to be able to determine a desirable level by using an absolute resolution to perform the efficient matching in the geometric hashing method

关键词： computer vision Surface reconstruction Solid modeling Layout Object recognition Shape Spline Surface topography Object detection Smoothing methods

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Rough sets handling missing values probabilistically interpreted

Rough sets handling missing values probabilistically interpr...

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High-Power Diode Laser technology and Applications IV

作者： Nakata, Michinori Sakai, Hiroshi Faculty of Management and Information Science Josai International University 1 Gumyo Togane Chiba 283-8555 Japan Department of Mathematics and Computer Aided Sciences Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804-8550 Japan

ISBN: (纸本)0819461466

We examine methods of valued tolerance relations where the conventional methods based on rough sets are extended in order to handle incomplete information. The methods can deal with missing values probabilistically interpreted. We propose a correctness criterion to the extension of the conventional methods. And then we check whether or not the correctness criterion is satisfied in a method of valued tolerance relations. As a result, we conclude that the method does not satisfy the correctness criterion. Therefore, we show how to revise the method of valued tolerance relations so that the correctness criterion can be satisfied. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Rough set theory

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