• 한국군사과학기술학회지
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• 제20권1호
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• pp.148-157
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• 2017

Miniature guided-bullet is an advanced military technology of developing guided missile which is designed to hit a target precisely while having easily carriable miniature size. A key issue of developing such system involves size reduction of the original guided missile system, and this in turn arouses stiffness issue regarding small and thin sized control surface. In this study, procedures on how to calculate the critical flutter speed of special type of control surface with the change of its dimension or material property is arranged. During this procedure, design parameters related to critical flutter speed are abridged to help preliminary design of similar structure even faster than time-consuming, and cumbersome computer analysis.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.658-661
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• 2008

본 연구는 증강현실 기술을 이용하여 토목시설물의 효율적인 현장 진도관리가 가능하도록 하는 AR-4D CAD의 구축 방법론을 제시하는 것이 목적이다. 이를 위해 증강현실의 4D CAD 적용성을 평가하고 AR-4D CAD시스템 구축을 위한 기술적 요구사항, 정보 흐름체계, 통합 인터페이스를 제시하였다. 이를 기반으로 실시간 진도관리의 시각화가 가능한 AR-4D CAD의 주요 기능을 분류하여 운용 시나리오를 제안하고 있다.

• Journal of Astronomy and Space Sciences
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• 제26권4호
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• pp.643-650
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• 2009

Korea Astronomy and Space Science Institute (KASI) has been developing one mobile and one stationary SLR system since 2008 named as ARGO-M and ARGO-F, respectively. KASI finished the step of deriving the system requirements of ARGO. The requirements include definitions and scopes of various software and hardware components which are necessary for developing the ARGO-M operation system. And the requirements define function, performance, and interface requirements. The operation system consisting of ARGO-M site, ARGO-F site, and Remote Operation Center (ROC) inside KASI is designed for remote access and the automatic tracking and control system which are the main operation concept of ARGO system. To accomplish remote operation, we are considering remote access to ARGO-F and ARGO-M from ROC. The mobile-phone service allows us to access the ARGO-F remotely and to control the system in an emergency. To implement fully automatic tracking and control function in ARGO-F, we have investigated and described the requirements about the automatic aircraft detection system and the various meteorological sensors. This paper addresses the requirements of ARGO Operation System.

• 대한기계학회논문집A
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• 제24권12호
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• pp.2883-2890
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• 2000

In this study, a Hardware-In-The-Loop-Simulation(HILS) system for developing a Electric-Power-Steering(EPS) system is designed. To test a EPS by HILS system, a mathematical vehicle model with a steering system model has been constructed. This mathematical model has been constructed. This mathematical model has been downloaded to the Digital-Signal-Processor(DSP) board. To realize the lateral force acting on the front wheel in a real car. the steering wheel angle sensor and vehicle velocity have been used for input signal. The force sensor has been used for a feedback signal. The full vehicle states could by simulated by the HILS system. Consequently, the HILS system could by used to analyze control-parameters of a EPS that contributes to the maneuverability and stability of a vehicle. At the same time, the HILS system can evaluate the whole performance of the vehicle-steering system. Also the HILS system could do test could not be executed in real vehicle. The HILs system will useful for developing the control logic for the EPS system.

• 인터넷정보학회논문지
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• 제8권6호
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• pp.29-42
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• 2007

본 논문은 분산 보안 정책을 지정하기 위해 객체그룹을 사용하는 u-헬스케어 컴퓨팅 환경에서 응용 서비스를 위해 동적 보안 서비스를 지원하는데 설계된 보안 객체에 대해 기술한다. 특히 u-헬스케어를 위한 분산 프레임워크의 보안 정책과 규칙 그리고 접근 제어에 사용되는 오퍼레이션을 포함한 보안 객체에 중점을 두었다. 그리고 DPD-Tool을 이용하여 서버 프로그램으로 구현된 객체들의 접근권한 부여 절차 및 클라이언트 프로그램 개발 과정을 보였다. 또한 DPD-Tool을 이용하여 모바일 모니터링 응용 개발 절차를 통해 u-헬스케어 지원 분산 프레임워크에서 지원하는 동적 보안 서비스의 수행성을 검증하였다.

• 대한안전경영과학회지
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• 제12권2호
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• pp.225-230
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• 2010

The purpose of the study was to apply and to expand the six sigma to reduce waiting times for computed tomography (CT) examination which manipulated by the department of radiology. It was preceded by DMAIC (Define, Measure, Analyze, Improve, and Control). In the stage of definition, it wereselected for total 5 critical to quality (CTQ), which were the kindness, the waiting time, the examination explanation, the waiting day and the waiting stand environment, that increased the reserved time of CT examination. In the stage of measurement, the number of examinations and of reservation waiting days performed and resulted in final CTQ(Y) which measured each 1.68 and 1.85 sigma. In the stage of analysis, the examination concentrated on morning time, non-scheduled examination of the day, the delayed time of booking, frequent telephone contacting and equipment malfunction were determined as variable key causes. In the stage of improvement, it were performed with expansion of the examination in the morning time, integration of laboratories that used to in each steps, developing the ability of simultaneous booking schedule for the multiple examinations, developing program of examination request, and the customer management team operations. For the control, the number of examinations and reserved waiting days were measured each 3.14 and 1.13 sigma.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.733-736
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• 2006

다양한 이동 통신 기술, 센서, 원격 제어 및 네트워크 인프라가 발달하고 생활의 질에 대한 기대치가 높아짐에 따라 홈네트워크에 관한 다양한 기술과 서비스에 관한 연구와 개발이 활발히 진행되고 있다. 홈네트워크 기술은 아직까지는 초기 투자 단계로서 사용자에게 필요한 서비스를 개발하고 편리성을 증대시키는 방향으로 개발되고 있지만, 더욱 서비스가 활성화되면 편리성을 보장할 수 있는 안전성에 관한 연구가 병행되어야 할 것이다. 따라서 본 논문에서는 내/외부의 불법 접근 및 허가되지 않은 접근으로부터 홈네트워크 시스템을 안전하게 방어하고 보호하기 위한 접근 제어 메커니즘을 제안한다.

• 아동학회지
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• 제32권5호
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• pp.135-150
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• 2011

The purpose of this study was to examine the interaction strategies used by typically developing boys and girls in their dealings with young children with ADHD in free play situations in inclusive classes. This was done in order to gain an in-depth understanding of the meaning of their interaction strategies. The subjects were 52 typically developing children (comprising 27 boys, 25 girls) and 3 young children with ADHD. The findings were as follows : First, the overall frequency of interaction strategies with the young children with ADHD was greater among the young female children (n = 372) than the young male children (n = 298). Second, when the utterance strategies of the male and female children were sub-categorized, both the male children (79.5%) and the female children (57.0%) mostly made use of avoidance strategies, one of the typical withdrawal strategies. Third, the interaction strategy of control represented 42.0 percent and as such was identified as the most prevalent interaction strategy utilized by the young male children studied. In the case of the young female children, obliging strategies were the most common interaction strategies representing 33.1 percent of the total used. In the light of the findings yielded from this study, some educational recommendations are provided.

• Journal of Electrical Engineering and Technology
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• 제12권1호
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• pp.134-144
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• 2017

This paper presents an adaptive control strategy for the speed control of a four-phase switched reluctance motor (SRM) in automotive applications. The main objective is to minimize the torque ripples, despite the unstructured uncertainties, time-varying parameters and external load disturbances. The bound of perturbations is not required to be known in the developing of the proposed adaptive-based control method. In order to achieve a smooth control effort, some properties are incorporated and the proposed control algorithm is constructed using the Lyapunov theorem where the closed-loop stability and robust tracking are ensured. The effectiveness of the proposed controller in rejecting high perturbed load torque with smooth control effort is verified with comparing of an adaptive sliding mode control (ASMC) and validated with experimental results.

• 한국정밀공학회지
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• 제24권12호
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• pp.82-87
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• 2007

Excavator has been used in wide field since the attachment in the end effect can be changeable according to the purpose of working. However, efficiency of work using excavator mainly depends on an operator's ability. For the purpose of improving the efficiency of work and reducing the fatigue of operator, the automatic excavator system has been researched. In this paper, the tracking control system of each links of excavator is designed before developing the automatic excavator system. In order to apply the tracking control system, the pneumatic excavator system is developed and the tracking control system is applied. For designing the tracking control system, the adaptive sliding mode control algorithm is proposed. The performance of the proposed control system is evaluated through experiments using the pneumatic excavator system.