• 제어로봇시스템학회논문지
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• 제7권4호
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• pp.295-303
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• 2001

The demand for steam generators is increasing in industrial systems in which the design strategy should be implemented for safe and efficient operation of steam generators. It is, however, difficult to design a controller by the conventional method because of the nonlinear dynamics of the steam generator and influences by the set value of disturbance. This paper presents an automatic parameter optimization technique for a multivariable fuzzy controller using evolutionary strategy, At first, we use the steady state information such as a steady state gain matrix(SSGM) and a relative gain matrix(RGM). We can obtain much information on the control inputs and the outputs of the boiler-turbine system from the matrices. In order to determine the structure of the controller by using RGM and SSGM, the fuzzy rules are trained by evolutionary strategy. The good performance of the proposed multivariable fuzzy controller is verified through simulations.

• 한국생산제조학회지
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• 제23권2호
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• pp.194-198
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• 2014

In recent years, RGM(roller gear mechanism) systems, wherein one of the gears of a meshing gear pair is replaced with pins or rollers, have been reintroduced, which is a consequence of, and therefore a reflection of, the rapid advances made in manufacturing technology. Three RTG(roller track gear) systems for arbitrary path transportation (e.g., L-, O-, U-, and S-shaped tracks) were constructed using two out of three RGM systems, namely, the CRP(cam rack pinion), CRG(cam ring gear), and RPG(roller pinion gear) systems, and are introduced in this paper. We also present three ways to prevent the intersection and non-contact phenomena at the teeth in the vicinity of the conversion point between two joined RGM systems.

• 한국생산제조학회지
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• 제21권5호
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• pp.702-707
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• 2012

This paper considers two linear drive systems using roller gear mechanism(RGM), one is the RRP(roller rack pinion) system that consists of a roller rack and a cam pinion, the other is the CRP(cam rack pinion) system that consists of a cam rack and a roller pinion. Through the comparison of contact forces and load-stress factors between two linear drive systems, it reveals that the RRP system is superior to the CRP system in the aspect of the bending strength, while the CRP system has higher contact fatigue resistance than that of the RRP system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.715-716
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• 2012

• 한국지능시스템학회논문지
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• 제15권6호
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• pp.701-708
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• 2005

사서함 구조에서 메시지 서비스를 위한 중요한 구조적 메커니즘은 메시지 객체들을 콘텐츠에 따라 그룹 클래스 계층 구조를 구성하는 것이다. 본 논문에서는 응용 도메인에서 많은 구조적인 메시지 객체들을 클러스터링하기 위한 $\alpha$-cut 기반의 genealogy 그룹화 방법을 제안한다. 제안된 방법은 의미적 유사 관계와 퍼지 유사 관계를 이용하여 관계성을 결정하고 search() insert(), hierarchy()의 연산을 이용하여 그룹화 구조를 수행한다. 이러한 구조는 그룹과 관련된 작업을 쉽게 처리해주고 질의응답 객체 식별, 유사성 발견 등을 쉽게 해준다. 따라서 제안된 사서함 구조는 그룹화 생성을 통해서 사용자들에게 메시지객체를 효율적으로 서비스하고 관리하는 기능을 제공한다. 그리고 제안된 기법의 성능을 알아보기 위해 5600개의 메시지 객체를 이용하여 non-grouping, BGM, RGM, OGM 방법과 비교 분석한다.