• 한국정밀공학회지
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• 제17권11호
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• pp.101-107
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• 2000

A design of the global optimal sliding mode control is presented to control the second order uncertain time varying system with torque limit. With specified ranges of parametric uncertainties and torque limit, the minimum arrival time to reference inputs can be calculated. The proposed control scheme is applied to the motor system carrying loads. The merit of the proposed control scheme is that the arriving time at the reference input, which is the revolution angle, and the maximum allowable acceleration are expressed in a closed form solution. The superior performance of the proposed control scheme is validated by the computer simulation and experiments comparing with other sliding mode controllers.

• Parasites, Hosts and Diseases
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• 제52권2호
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• pp.225-229
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• 2014

A total of 9,281 larval chigger mites were collected from small mammals captured at Hwaseong-gun, Gyeonggi-do (Province) (2,754 mites from 30 small mammals), Asan city, Chungcheongnam-do (3,358 mites from 48 mammals), and Jangseong-gun, Jeollanam-do (3,169 for 62 mammals) from April-November 2009 in the Republic of Korea (= Korea) and were identified to species. Leptotrombidium pallidum was the predominant species in Hwaseong (95.8%) and Asan (61.2%), while Leptotrombidium scutellare was the predominant species collected from Jangseong (80.1%). Overall, larval chigger mite indices decreased from April (27.3) to June (4.9), then increased in September (95.2) and to a high level in November (169.3). These data suggest that L. pallidum and L. scutellare are the primary vectors of scrub typhus throughout their range in Korea. While other species of larval chigger mites were also collected with some implications in the transmission of Orientia tsutsugamushi, they only accounted for 11.2% of all larval chigger mites collected from small mammals.

• 정보처리학회논문지D
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• 제8D권5호
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• pp.473-482
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• 2001

이질형 통합 데이타베이스 시스템은 비정형 데이타를 비롯하여 관계형 데이타베이스 시스템의 정형 데이타에 이르기까지, 지역적으로 여러곳에 산재해 있는 유용한 정보를 통합하여 일관된 인터페이스를 통한 접근을 제공하는 통합 데이타베이스 시스템이다. 통합된 데이타 자원들은 서로 다른 질의 처리 능력을 제공할 뿐 아니라, 지역 자치성(local autonomy)요구사항 때문에 전역적 트랜잭션 처리를 위한 지역 시스템의 상호 협조 운영이 불가능하여, 전역적 직렬성(global serializability)을 만족하는 전역 트랜잭션 관리기의 설계가 없다. 본 논문에서는 이질형 통합 데이타베이스 시스템의 전역 트랜잭션 관리 문제점 중에서 가장 잘 알려진 간접충돌의 문제를 해결하기 위해, 전역 무결성 제약사항의 특징을 이용한 전역 트랜잭션 모델을 정의한다. 전역 트랜잭션 모델을 기반으로 지역-로킹 연산과 이에 다른 프로토콜을 제안하고, 제안된 프로토콜이 전역 트랜잭션을 보장함을 증명한다. 또한 본 논문에서 제안된 지역 -로킹 병행수행 제어 방법은 보다 현실적인 간접충돌의 범위를 정의함으로써, 기존의 제안된 방법보다 높은 병행성 정도(concurrency degree)를 보장함을 지역 접근에 대한 경쟁률 분석을 통해 살펴본다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.308-313
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• 2005

For a real-time quadruped robot running control, there are many important objectives to consider. In this paper, the running control architecture based on global states, which describe the cyclic target motion, and central pattern is proposed. The main goal of the controller is how the robot can have robustness to an unpredictable environment with reducing calculation burden to generate control inputs. Additional goal is construction of a single framework controller to avoid discontinuities during transition between multi-framework controllers and of a training-free controller. The global state dependent neuron network induces adaptation ability to an environment and makes the training-free controller. The central pattern based approach makes the controller have a single framework, and calculation burden is resolved by extracting dynamic equations from the control loop. In our approach, the model of the quadruped robot is designed using anatomical information of a cat, and simulated in 3D dynamic environment. The simulation results show the proposed single framework controller is robustly performed in an unpredictable sloped terrain without training.

• 한국항해항만학회지
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• 제45권4호
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• pp.181-185
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• 2021

본 연구에서는 어구의 정상 또는 유실 등의 상태 여부를 판단하기 위한 어구정보를 IoT 기반의 통신망을 이용하여 수신하고 분석하여, 어구의 현재 상태를 관리할 수 있고, 어구에 이상 상태 발생 시 이를 확인하고, 신속한 어구 회수 등의 관리를 수행할 수 있도록 지원하는 어구 부이 관리시스템을 개발하는 것에 관한 내용을 다룬다. IoT 기반의 통신망을 사용한 어구 관리 체계 및 통합 관리 구조 설계를 수행하였으며 이를 이용한 어구 부이 통합 관리 시스템을 개발하여 이에 대한 시스템 시험 및 검증을 수행하여 실효성을 확인하였다.

• 한국소음진동공학회논문집
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• 제21권11호
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• pp.983-990
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• 2011

This paper investigates active noise control(ANC) of a rectangular cavity using single channel filtered-x least mean square(FXLMS) algorithms to globally reduce the interior noise. To obtain the global reduction of the interior noise, multichannel active control should be incorporated in general. We, however, examined firstly the optimal location of the secondary source that produces a global reduction of the interior noise field using single channel control. We then investigated the frequency characteristics of the reduction to yield the effective frequency band of the active control system. It follows that the secondary source should be located as close to the primary source as possible in order to obtain the global reduction.

• 한국유통학회지:유통연구
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• 제1권2호
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• pp.141-172
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• 1996

This study is to investigate global logistics strategies of Korean electronics companies. in terms of service parts. According to the survey, Korean electronics companies were pursuing multi-level global logistics network such as global, continental, national, regional and service center echelon for improving the efficiency of service parts global logistics. Especially there was a tendency of developing new continental distribution centers. And the companies were exploiting efficiency through inventory control by multi-level echelon, demand forecasting by the product life cycle and supply and service lead time management. But there were some insufficient factors for the efficiency of global logistics operation at the construction of worldwide real time logistics information system and pursuit of the efficiency on the whole network including subcontractors. For the future competitive advantage of the Korean electronics companies, the following are suggested: 1) the establishment of arranged logistics channel adjusting each company's global strategy, 2) the construction of worldwide real time logistics information system, 3) the reengineering of all logistics procedures such as order processing, shipping, inventory control, etc., 4) the enhancement of the ratio of the supply from the external companies and the internal manufacturing subsidiaries at each continent, 5) and the pursuit of operational internalization of external subcontractors.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2015년도 제51차 동계학술대회논문집 23권1호
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• pp.309-311
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• 2015

본 논문에서는 EMOTIV사의 뇌파 측정기 EPOC을 통한 뇌파의 측정과 이를 활용한 게임 시나리오를 제안한다. 이 방안은 다소 복잡하고 어려운 뇌파의 측정과 활용을 EMOTIV사에서 제공하는 응용 프로그램을 이용하여 쉽게 뇌파를 측정하고 이를 실시간으로 아케이드 게임 시나리오와 연동이 가능하게 한다. EPOC Control Panel을 통해 뇌파의 측정 및 훈련을 하고 윈도우상의 키보드 값에 대응 시켜 여러 가지 활용이 가능하다.

• 제어로봇시스템학회논문지
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• 제12권10호
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• pp.955-961
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• 2006

The global ultrasonic system for the self-localization of a mobile robot consists of several ultrasonic transmitters fixed at some reference positions in the global coordinates of robot environment. By activating the ultrasonic transmitters, the mobile robot is able to get the distance to the ultrasonic transmitters and compute its own position in the global coordinate. Due to the limitation on the ultrasonic signal strength and beam width as well as the environmental obstacles however, the ultrasonic signals from some generator may not be transmitted to the robot. Thus, instead of activating the all ultrasonic transmitters, it is necessary to select some ultrasonic generators to activate based on the current robot position. In this paper, we propose a selective activation algorithm for self-localization with the global ultrasonic system. The selective activation algorithm gets the meaningful ultrasonic data at every sampling instants, which results in the faster and more accurate response of the self-localization than the conventional sequential activation. Through the self-localization and path following control, we verify the effectiveness of the proposed selective activation algorithm.

• East Asian mathematical journal
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• 제35권1호
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• pp.91-98
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• 2019

This paper is concerned with the global existence of strong solution for the controlled ode-pde systems. Also, we consider the continuous dependence of solution on the control.