Special Section of Letters Selected from the 1994 IEICE Fall Conference
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 . FOREWORD  ...................................................... 549
        Nozomu HAMADA 

 LETTERS
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 . A Unified First Return Map Model for Various Types of Chaos Observed
   in the Thyristor ................................................ 550
        Yoh YASUDA and Koichiro HOH

 . Stability Criteria for Interval Matrices via Regularity Conditions
            ........................................................ 553
        Takehiro MORI and Hideki KOKAME

 . Binary and 2k-Ary Cyclic AN Codes for Burst Error Correction .... 556
        Ryutaro MURAKAMI, Yoshiteru OHKURA and Ryosaku SHIMADA

 . A Bipolar Very Low-Voltage Multiplier Core Using a Quadritail Cell
            ........................................................ 560
        Katsuji KIMURA

 . Wide Bandwidth SAW Resonator Filter Using 36 Y-X LiTaO3 Substrate
            ........................................................ 566
        Yasushi KURODA, Satoshi ICHIKAWA, Seiichi MITOBE and Masayoshi
        KOSHINO

 . Model-Adaptable Parameter Extraction System for MOSFET Models ... 569
        Masaki KONDO, Takashi MORIE, Hidetoshi ONODERA and Keikichi
        TAMARU

 . Simulation Model of Self Adaptive Behavior in Quasi-Ecosystem ... 573
        Tomomi TAKASHINA and Shigeyoshi WATANABE

 . Evaluating Security of a Simple Interactive Human Identification
   Scheme .......................................................... 577
        Ryo MIZUTANI and Tsutomu MATSUMOTO

 . Evaluation of Self-Organized Learning in a Neural Network by Means
   of Mutual Information ........................................... 579
        Toshiko KIKUCHI, Takahide MATSUOKA, Toshiaki TAKEDA and
        Koichiro KISHI

 . An Efficient Extraction Method for Closed Loops Using a Graph Search
   Technique ....................................................... 583
        Shin'ichi SATOH, Hiroshi MO and Masao SAKAUCHI

 . KASTAM: A Model of Kanji Learning for Knowledge Stability ....... 587
        Toshihiro HAYASHI, Yukuo HAYASHIDA and Yoneo YANO

 . Feature-Based Image Analysis for Classification of Echocardiographic
   Images .......................................................... 589
        Du-Yih TSAI and Masaaki TOMITA

Regular Section
===============
PAPERS
======
[Digital Signal Processing]

 . Passive Sonar-Ranging System Based on Adaptive Filter Technique . 594
        Chang-Yu SUN, Qi-Hu LI and Takashi SOMA

 . Recursive Estimation Technique of Signal from Output Measurement
   Data in Linear Discrete-Time Systems ............................ 600
        Seiichi NAKAMORI

[Nonlinear Problems]

 . On a Ring of Chaotic Circuits Coupled by Inductors .............. 608
        Yoshifumi NISHIO and Akio USHIDA

[VLSI Design Technology and CAD]

 . A Formal Verification Algorithm for Pipelined Processors ........ 618
        Toru SHONAI and Tsuguo SHIMIZU

 . An Electrical Characteristics-Based Piecewise-Linear DC Model of the
   MOSFET .......................................................... 632
        Yong S. KWON and Young H. KIM

LETTERS
=======
[Digital Signal Processing]

 . Estimation of ARMAX Systems and Strictly Positive Real Condition  641
        Jianming LU, Takashi YAHAGI and Jianting CAO

 . ABSTRACTS (IEICE Trans., Vol.J78-A, No.5 in Japanese) ........... 644