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CROSS LAYER DESIGN AND ANALYSIS OF WIRELESS NETWORKS WITH EFFECTIVE BANDWIDTH FUNCTION
Fumio Ishizaki,Gang Uk Hwang 한국산업응용수학회 2006 한국산업응용수학회 학술대회 논문집 Vol.1 No.2
In this paper we propose a useful framework for a cross layer design and analysis of wireless networks where an AMC (Adaptive Modulation and Coding) scheme is employed. In the framework, we model the joint effect of the packet transmission error rate at the PHY layer and the packet loss probability at the MAC layer by introducing the effective bandwidth function of the packet service process. With the help of the effective bandwidth function, we can characterize the wireless channel, analyze the queueing system, and determine an AMC scheme which satisfies the required packet loss probability by a user and minimizes the average packet trans¬mission error rate. Some numerical examples show the characteristics of wireless networks with an AMC scheme and how to determine an AMC scheme in detail.
The latest trend of electric equipment in relation to energy conservation
Akira, Ishizaki The Korean Institute of Electrical Engineers 1981 전기의 세계 Vol.30 No.10
Since the oil crisis in 1973, Japanese industrial fields have put many energy conservation schemes into practice and obtained fruitful results. This artical deals with the latest trend in Japan of energy conservation in electrical equipment and introduces some examples of new systems.
Taking Generation as Abduction Seriously
( Masato Ishizaki ),( Akira Ishikawa ) 한국언어정보학회 1992 국제 워크샵 Vol.1992 No.-
This paper introduces ``assumptions``, one-sided mutual beliefs, to construct a bidirectional architec-ture incorporating Hobbs et al.``s abduction. The integration of deductive parsing and abductive semantic interpretation may provide a basis for a bidirectional architecture. However, the idea of cost, the prin-cipal mechanism in Hobbs et al.``s abduction, is not workable for generation because it simply amounts to the assumability of parts of logical forms for the purpose of interpretation. We introduce explicit ``assumptions`` attached to particular expressions so as not only to control generation, but also to lighten the burden of abduction. This paper also discusses implementation issues on the data structure and the generation algorithm.
Masataka Ishizaki,Kazuhiro Yubai,Junji Hirai 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
This paper proposes the model-free multivariable controller tuning method for the H∞ model matching problem based on spectral analysis. This method provides a controller without the plant model by using only Input/Output data. It evaluates the H∞ norm of the difference between the reference model and the achieved closed-loop system. Therefore, this method can design a controller in consideration of the worst-case performance .The proposed method is numerically verified via the experimental apparatus.
BIM을 활용한 설비계획, 설계 : 열부하계산,CFD해석,실시설계,적산 등
Yoji Ishizaki,노상태 (번역자) 대한설비공학회 2012 설비저널 Vol.41 No.9
BIM(Building Information Modeling)에는 여러 가지 가능성이 있다. 단순히 지금까지 이차원으로 작성해왔던 도면을 삼차원화하는 것만이 아니다. 본고에서는 BIM의 효과 중 실무에서 그 성과가 두드러지고 있는 것들을 소개하고자 한다. 한편, BIM에 필요한 소프트웨어, 하드웨어는 아직 계속 발전 중에 있어, 효과를 발휘하려면 이들을 조합해서 사용하는 방법에 대한 공부가 필요하다. 또한, 도면작성 이외의 설계 도구로서의 활용 방법에 관한 사례도 소개하고자 한다.