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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： F. Ishizaki T. Takine Y. Oie Dept. of Inf. Sci. & Intelligent Syst. Tokushima Univ. Japan Department of Applied Mathematics and Physics Graduate School of Informatics Kyoto University Kyoto Japan Department of Computer Science and Electronics Kyushu Institute of Technology Faculty of Computer Science Iizuka Japan

We consider a priority cell scheduling in the following scenario. High-speed cell networks accommodate constant bit rate (CBR) streams from real-time sources and unspecified bit rate (UBR) streams from non real-time sources. The real-time traffic requires guarantees of its delay time. On the other hand, the non real-time traffic is relatively tolerable to its delay time. We obtain the queueing delay distribution of cells from CBR streams. Further the average queueing delay of cells from UBR streams is obtained in some special cases. We provide some numerical results and discuss the effectiveness of quality-of-service (QoS) guarantees based on the statistical bound and the influence of UBR streams on the system performance.

关键词： Traffic control Processor scheduling Telecommunication traffic Delay effects Bit rate Switches Quality of service system performance High-speed networks Intelligent systems

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A network intelligent educational system for arithmetic word problems

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systems and computers in Japan 1998年第10期28卷

作者： Noriyuki Iwane Akira Takeuchi Setsuko Otsuki Faculty of Information Sciences Hiroshima City University Hiroshima Japan 731-31 Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan 820

This paper proposes an intelligent support method for solving arithmetic word problems and a method to build a learning environment on a network. Our system solves arithmetic word problems written in Japanese in the same way as humans do, by syntax analysis, mathematical semantic analysis, formulation, and calculation. Using data generated during these processes, computers support learners by adapting to each individual learner's comprehension level through Q & A with animation. The fundamental ideas and a few examples of solving word problems, supporting learners by using animation, and building the environment on a network are described. © 1998 Scripta Technica, Syst Comp Jpn, 28(10): 30–39, 1997

关键词： intelligent educational support environment arithmetic word problem intelligent tutoring system multimedia animation network

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Analysis of packet loss in transport layer over ATM networks

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International Journal of Communication systems 1998年第4期10卷

作者： Kazumi Kumazoe Kenji Kawahara Tetsuya Takine Yuji Oie Switching Division NEC Corporation Abiko 270-11 Japan Department of Computer Science and Electronics Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Japan Department of Information Systems Engineering Faculty of Engineering Osaka University Suita 565 Japan

In asynchronous transfer mode (ATM) networks, when cells are lost due to congestion, packets containing the lost cells should be retransmitted in the transport layer, which manages the end-to-end communication. The probability that a packet contains at least one lost cell depends on the packet length. It is thus very likely that the performance of the end-to-end communication is influenced by the packet length. In this paper, we analyse packet loss probability and the achievable maximum throughput when a block of data is divided into packets of fixed size and the lost packets are retransmitted based on the selective repeat automatic repeat request (ARQ). Through this analysis, we examine the effect of packet length and peak cell transmission rate on the performance measures mentioned above. © 1997 John Wiley & Sons, Ltd.

关键词： ATM transport layer packet loss analysis throughput analysis

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Ab initio MO study of the chlorophyll dimer in the photosynthetic reaction center. I. A theoretical treatment of the electrostatic field created by the surrounding proteins

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International Journal of Quantum Chemistry 1998年第1期61卷

作者： Toshihiro Sakuma Hiroshi Kashiwagi Toshikazu Takada Haruki Nakamura Kyushu Institute of Technology Faculty of Computer Science and Systems Engineering Iizuka 820 Japan NEC Corporation Fundamental Research Laboratories 34 Miyukigaoka Tsukuba 305 Japan Biomolecular Engineering Research Institute 6-2-3 Furuedai Suita Osaka 565 Japan

The charge separation occurring in the photosynthetic reaction center is the primary subject in order to understand the whole photosynthetic process. In this article, the electronic structures of the chlorophyll dimer, in which photoexcitation occurs, are investigated by using the ab initio molecular orbital scheme and pseudocharges and dipoles method which takes into account the electrostatic effect of the surrounding proteins, pigments, and aqueous solvent. As a first step, the ionization potentials of BCmp, BCIp, and the dimer of Rhodopseudomonas viridis are computed to study the characteristic of each molecule toward the elucidation of the primary charge separation. It has been found, from the present calculations, that BCmp and BClp constituting the dimer are not equivalent in their electronic ground states, since the electron could be removed more easily from BCmp than from BClp for two reasons: (1) the distorted molecular plane of Cmp, and (2) the effects of the surrounding electrostatic potentials to BCmp and BCIp. This tendency is further strengthened by the polarization of the environment, when, to the ab initio MO calculation, the contribution from the induced dipoles of the neighboring atoms in the proteins and other chromophores is included. From the present application, induced electric dipoles are found to be important to describe the molecular electronic structures affected by proteins. © 1997 John Wiley & Sons, Inc.

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Primary structures of sperm-specific basic nuclear proteins and gene expression in Japanese newt, Cynops pyrrhogaster

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Molecular Reproduction and Development 1998年第3期46卷

作者： Kumiko Yoshinobu Toshihiro Kondo Masayuki Takai Chiaki Katagiri Hiroyuki Tou Shin-Ichi Abe Kazufumi Takamune Gene Technology Center Kumamoto University Kumamoto Japan Department of Biological Science Faculty of Science Kumamoto University Kumamoto Japan Central Laboratory for Medical Study and Research Equipment Saga Medical School Saga Japan Biological Laboratory Saga Medical School Saga Japan Division of Biological Science Graduate School of Science Hokkaido University Sapporo Japan Department of Biochemical Engineering and Science Faculty of Computer Science and System Engineering Kyusyu Institute of Technology Iizuka Japan

Electrophoretic analyses of acid extracts from mature sperm of newt, Cynops pyrrhogaster, on acid/urea/Triton X-100 polyacrylamide gel showed the exclusive occurrence of sperm-specific nuclear basic proteins (SBPs), which moved faster than somatic histones on the gel. These SBPs were eluted separately by reversed phase-high-performance liquid chromatography as two large peaks and a few small peaks. Of these, only the small peaks disappeared with treatment of the acid extracts with alkaline phosphatase before they were injected into the column, so that there were only two distinct components: NP1 and NP2. Determination of amino acid sequences by the Edman method as well as by sequencing of cDNA for both components indicated that each protein consisted of 43 (NP1) or 48 (NP2) amino acid residues, rich in arginine residues (53.5% in NP1; 47.9% in NP2), forming the clusters. They had molecular masses of 5,386 Da (NP1) and 5,748 Da (NP2), respectively. Northern blot analysis using cDNAs as probes indicated that mRNAs for both NP1 and NP2 occurred not in primary spermatocytes but in round spermatids. In situ hybridization analyses using antisense RNA for NP1 as a probe clearly showed the first appearance of NP1 mRNA at the late stage of round spermatid. Mol. Reprod. Dev. 46:243–251, 1997. © 1997 Wiley-Liss, Inc.

关键词： protamine spermatogenesis testis amphibian

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Linear complexity of periodic sequences obtained from a sequence over GF(p) with period p(n)-1 by one-symbol deletion

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND computer scienceS 1997年第6期E80A卷 1164-1166页

作者： Uehara, S Imamura, K Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka-shi 820 Japan

From a sequence {a(i)}(i greater than or equal to 0) over GF(p) with period p(n)-1 we can obtain periodic sequence {}(i greater than or equal to 0) with period p(n)-2 by deleting one symbol at the end of each period. ... 详细信息

From a sequence {a(i)}(i greater than or equal to 0) over GF(p) with period p(n)-1 we can obtain periodic sequence {<(a)over tilde (i)>}(i greater than or equal to 0) with period p(n)-2 by deleting one symbol at the end of each period. We will give the bounds (upper bound and lower bound) of linear complexity of {<(a)over tilde (i)>}(i greater than or equal to 0) and {a(i)((j))}(i greater than or equal to 0), j is an element of GF(p)\{0}. For a binary m-sequence {a(i)}(i greater than or equal to 0) with period 2(n)-1, n-1 a prime, we wil give the explicit formula for the charasteristic polynomial of {<(a)over tilde (i)>}(i greater than or equal to 0).

关键词： linear complexity GF(p) sequences with period p(n)-1 one-symbol deletion

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Suppression of pair-pulse depression of the population spike in the dentate gyrus during carbachol-induced theta-like activity in guinea pig hippocampal slices

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NEUROscience RESEARCH 1997年第2期29卷 113-120页

作者： Natsume, K Kometani, K Department of Biochemical Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan

In pair-pulse stimulation experiments, pair-pulse depression (PPD) of the population spike (PS) occurred at intervals shorter than 20 ms in the dentate gyrus in guinea pig hippocampal slices. Application of 50 mu M carbachol resulted in an increase in the test PS amplitude and caused suppression of PPD. This suppression was antagonized by atropine sulfate, a muscarinic receptor antagonist. Carbachol at 50 mu M induced intermittent bursts of theta-like activity (TLA). We compared the pair-pulse index (PPI) during TLA with that in a rest period between bursts of TLA. The PPI was defined as the ratio of the amplitude of the test PS to that of the conditioning PS. The PPI during TLA were significantly larger than that during the rest period, although there were no significant differences in the conditioning PS amplitude and the test pEPSP slope. When TLA was induced, the PPI during the rest period was increased by bicuculline. The PPI during TLA did not change significantly with the drug. The increase by bicuculline in the PPI during the rest period was caused by increase in the test PS amplitude. PPD can occur due to inhibition of granule cell activity by inhibitory neurons. Our findings suggest that the action of inhibitory neurons on granule cell activity is suppressed by activation of muscarinic receptors, with stronger suppression during TLA than during the rest period between bursts of TLA. (C) 1997 Elsevier science Ireland Ltd.

关键词： guinea pig carbachol rhythmic wave pair-pulse depression disinhibition theta-like activity memory process

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An approach to designing the fuzzy IF-THEN rules for fuzzy-controlled static var compensator (FCSVC)

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INFORMATION scienceS 1997年第3-4期101卷 249-260页

作者： Yamakawa, T Uchino, E Takayama, M Department of Computer Science and Control Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan

This paper describes an approach to designing-fuzzy if-then rules for the fuzzy-controlled static var compensator (FCSVC) in a three-phase electric power system. In general, it is very difficult to control the rms line voltage in the three-phase ac circuit. We propose the FCSVC system to control the voltage. FCSVC is an rms line voltage stabilizer using three static var compensators (SVC) which are controlled by a fuzzy logic controller (FLC). Moreover, we propose an easier and more efficient approach to designing the fuzzy if-then rules of FCSVC. The effectiveness of the FCSVC described in this paper is verified by the experimental results. (C) Elsevier science Inc. 1997.

关键词： Fuzzy control

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theta-activity-dependent and -independent muscarinic facilitation of long-term potentiation in guinea pig hippocampal slices

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NEUROscience RESEARCH 1997年第4期27卷 335-341页

作者： Natsume, K Kometani, K Department of Biochemical Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan

Cholinergic input to the hippocampus originates in the septum and diagonal band. Guinea pig hippocampal slices in a bath of carbachol, a cholinergic agonist, displayed different patterns of rhythmical activities depending on the carbachol concentration. Exposure to 50 or 100 mu M led to intermittent induction of theta-like activities (TLAs). Long-term potentiation (LTP), induced by tetanus, was facilitated at concentrations within the optimum range for generating TLAs. This facilitation was blocked by the muscarinic receptor antagonist atropine. Augmentation of LTP during TLAs was greater than that during the rest period of TLAs which, in turn, was greater than that induced without activation of the muscarinic receptors. These results suggest that there are two muscarinic facilitation processes of LTP, one dependent on and the other independent of TLAs, with the former being more easily facilitated than the latter. (C) 1997 Elsevier science Ireland Ltd.

关键词： guinea pig carbachol rhythmical activity long-term potentiation (LTP) hippocampal slice theta-like activity memory process

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Principal neuronal organization in the frog optic tectum revealed by a current source density analysis

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VISUAL NEUROscience 1997年第2期14卷 263-275页

作者： Nakagawa, H Miyazaki, H Matsumoto, N [a1 ]Department of Biochemical Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan

In the frog optic tectum, the spatiotemporal pattern of neuronal activity evoked by electrical stimulation of the optic tract was examined by means of a current source density (CSD) analysis. The CSD depth profile was highly reproducible in different experiments. In all seven CSD profiles, three current sinks A, B, and D were observed in the retinorecipient layers. Four out of the seven profiles show additional two sinks C and E below the retinorecipient layers. Very small and short lasting sinks related to afferent fiber activities precede sinks A and B by about 1 ms, which could be accounted for by monosynaptic delay, in the corresponding depth region. The earliest prominent sink A at the bottom of the retinorecipient layers reflects only excitatory monosynaptic activities derived from R3 and/or R4 retinal ganglion cells. The second prominent sink B in the superficial retinorecipient layer is composed partly of excitatory monosynaptic activity from medium-sized myelinated optic fibers. It may involve excitatory monosynaptic activity from unmyelinated optic fibers and further polysynaptic activity. The fourth prominent sink D in the intermediate retinorecipient layer partially reflects excitatory monosynaptic activity derived from unmyelinated optic fibers. It may also involve further polysynaptic activity. In contrast with these three sinks, the third prominent sink C and fifth sink E exclusively reflect intratectal polysynaptic activity that has not been reported in any previous CSD studies in the frog optic tectum. These sinks almost overlap spatially in the tectal layer. We also measured the intratectal resistance changes and computed inhomogeneous CSD depth profiles to show that the results from homogeneous CSD computation assuming constant conductivity are valid for our present study. Finally, we compared the present results with previously reported CSD studies on the frog optic tectum and discuss consistencies and discrepancies among these experiments.

关键词： frog optic tectum current source density analysis intratectal conductivity retinotectal connection intratectal connection

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