• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.117.6-117
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• 2002

$\textbullet$ Functionally modularized robot $\textbullet$ Free from defects of monolithic system $\textbullet$ Modularization based on Reactive paradigm $\textbullet$ Virtual Machine $\textbullet$ Network topology $\textbullet$ Fractionization of robot development scheme $\textbullet$ Development for commercialization of personal robot

• 한국산학기술학회논문지
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• 제12권11호
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• pp.5202-5207
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• 2011

여러 산업 분야에서 온도 제어 시스템 설계는 매우 중요한 문제이다. 시스템 개발을 위해서는 개념적인 디자인, 실제 테스트를 위한 시스템 구현, 반복적인 실험을 통한 제어기 설계용 수식모델 도출, 제어기 설계 및 성능 테스트의 과정을 거친다. 통상적으로 실제 테스트 시스템 구현 및 반복적인 실험을 통한 모델링, 제어기 설계 및 성능 테스트에 매우 많은 시간과 비용이 소요된다. 대부분의 온도 제어 시스템 설계 문제에서 동작 온도는 복사 열전달은 무시될 수 있는 범위이며, 히터는 듀티비를 이용하여 ON/OFF 방식으로 제어된다. 본 논문에서는 이러한 조건에서 개념적인 초기 시스템 디자인 후 제어기 설계용 모델 도출에서부터 제어기 설계 및 제어성능 예측까지의 전 과정을 자동으로 수행할 수 있는 기법을 제시하여 온도 제어 시스템의 초기 설계를 손쉽고 빠르게 검증 할 수 있도록 하였다. SISO (Single Input Single Output) 시스템을 예로 들어 제안한 기법의 유용함을 보였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.373-376
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• 2001

In this paper to cope with the reduction of products life-cycle as the variety of products along with the various demands of consumers, a virtual simulator is developed to make the changeover of manufacturing line efficient to embody a virtual simulation similar to a real manufacturing line. The developed virtual simulator can design a layout of a factory and make the time scheduling. Every factory has one simulator so that one product can be manufactured in the factories to use them as virtual factories. We suggest a scheme that heightens the ability to the diversity of manufacturing models by making the information of manufacturing lines and products models to be shared. The developed system embodies a virtual manufacturing line on the simulation using various manipulators and work cells as manufacturing components. we develop a virtual simulator system on Window 98/NT environment of Microsoft, operating system using of the greater part of PC user. Window program have a merit making GUI environment that programmer can use without the expert knowledge about hardware. A suer with the simulator can utilize an interface that makes one to manage the separate task process for each manufacturing module, change operator components and work cells, and easily teach tasks of each task module.

• 전산구조공학
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• 제4권2호
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• pp.103-110
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• 1991

컴퓨터의 제한된 코어메모리로 대형문제를 해결하기 위하여 디스크를 마치 메모리처럼 사용할 수 있는 가상 메모리 데이타베이스 기법을 개발하였다. 이 기법과 아울러 최대 가용코어메모리를 작동시키는 방식을 사용하여 유한요소 해석시 흔히 발생하는 스카이라인 형태로 저장된 대칭통산행예(Sparse Symmetric Matrix)에 대한 매우 효과적인 코어 내 및 코어 외 직립방정식의 해법을 개발하였다. 제안된 방법은 다른 코어 외 해법에 비해 알고리즘 및 코딩이 매우 간단하여 계산효율을 상당히 향상시켰다. 해석예에서는 제안된 방법을 사용하여 대규모 구조해석 문제를 메모리 용량이 작은 소형컴퓨터에서 대단히 효율적으로 해결하였음을 보여주었다.

• 한국통신학회논문지
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• 제27권4C호
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• pp.326-332
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• 2002

클러스터 내의 노드들 사이에서 대용량의 데이터들을 보다 빠르게 전송하기 위해서 경량 메세징(Lightweight Messaging) 기법이 등장하였다. 이 기법들 중 VIA(Virtual Interface Archi- tecture)는 사용자 수준에서 커널을 거치지 않고 네트워크 장치와 직접적으로 통신을 할 수 있게 하여 클러스터 시스템의 프로토콜로 자리를 잡아가고 있다. 그러나 이러한 장점에도 불구하고 프로그래밍이 어려워 제대로 숙지하기까지는 많은 시간의 투자가 필요한 것이 사실이다. 이 논문에서는 개발자들이 좀더 쉽게 VIA에 접근할 수 있는 EVIL(Easy-to-use Virtual Interface Library)을 제안하였다. 그리고 EVIL을 Native VIA, TCP/IP와 각각 성능을 비굔 평가하였다.

• 대한조선학회논문집
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• 제55권4호
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• pp.361-369
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• 2018

The ship surveyor makes a scheme of reasonable ship operation by examining whether the ship has been properly constructed in accordance with the rule of classification societies and international conventions or whether the facilities of the ship in operation meet the standard stipulated by law. Even though the ship surveyors of classification society generally consist of people who have the skill of design or operation of a ship, it takes a long time to train a surveyor to the maturity level. This paper describes the development of survey simulator based on virtual ship environment that enables the surveyor minimize trial and errors to survey the ships. By using VR(Virtual Reality) based survey simulator, surveyors possibly achieve improvement of competence in survey quality by means of safe and immersive training environment. In order to improve the usability and utility of the VR simulator, the ship 3D model has been generated using 3D CAD model for design and production in shipyard. Through this, we suggested the possibility of consistent use of 3D model as the digital twin of a ship.

• 정보보호학회논문지
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• 제25권1호
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• pp.5-15
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• 2015

초고속 인터넷과 무선통신망의 발달로 전자상거래는 급증하는 추세이다. 그러나 최근 이동통신사, 금융사 등의 해킹사건으로 인해 많은 수의 개인정보가 유출되었다. 특히 신용카드정보의 경우 온라인 거래에 악용되어 결제를 시도할 수 있고 이에 따른 피해는 카드소지자가 입게 된다. 이를 막기 위해 실제카드번호 대신 가상카드번호를 사용하는 기법들이 제안되었다. 하지만 기존의 제안들은 취약점이 존재하고 추가적인 보안 인프라가 필요하다. 본 논문에서는 기존에 제안된 가상카드번호 기법들을 분석하고 카드 사용자가 공개키/비밀키 키쌍을 생성하고 공개키를 카드사에 사전등록 함으로써 보안 요구사항을 충분히 만족시키면서도 추가적인 보안 인프라 없이 효율적으로 결제할 수 있는 가상카드번호 기법을 제안한다.

• 한국주거학회논문집
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• 제20권1호
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• pp.91-99
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• 2009

With the development of the internet and the spread of 'digital home', apartment houses equipped with the homepages connecting apartment houses as one cyberspace unit have increased. The virtual community with a homepage in apartment complex have improved the effect on management businesses in the side of a apartment manager and increased the importance of the space with a strong tie between residents in the side of residents. But the apartment residents didn't make full use of the virtual community because they have the low level of recognition of it. Therefore, this study attempted to present basic materials for the scheme to revitalize the virtual community. For this purpose, it attempted to find residents' recognition of and participation in the virtual community and demand for the classified contents conducted before this study. In the research method, it conducted the questionnaire research. The results are as follows. 1) First of all, It was found that the apartment residents had the low level of recognition of the virtual community. There was a significant difference according to the degree and the level of using the internet. Some easy-access programs are necessary. 2) The apartment residents took part in the virtual community about 67 percents because there was a lack of the public relation of the virtual community. 3) It was found that there was a significant positive correlation between the level of recognition and participation. 4) An attempt was made to identify the apartment residents' demand for the type of virtual community contents. It was found that most of contents were needed. 'apartment complex introduction and management information' showed the highest score among them. 5) Most respondents are affirmative to the virtual community. Therefore the residential community could be reinforced if the contents of virtual community is developed and well operated in the future.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권9호
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• pp.1544-1572
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• 2011

Task placement and scheduling are traditionally studied in following aspects: resource utilization, application throughput, application execution latency and starvation, and recently, the studies are more on application scalability and application performance. A methodology for task placement and scheduling centered on tasks based on virtual machines is studied in this paper to improve the performances of systems and dynamic adaptability in applications development and deployment oriented parallel computing. For parallel applications with no real-time constraints, we describe a thought of feature model and make a formal description for four layers of task placement and scheduling. To place the tasks to different layers of virtual computing systems, we take the performances of four layers as the goal function in the model of task placement and scheduling. Furthermore, we take the personal preference, the application scalability for a designer in his (her) development and deployment, as the constraint of this model. The workflow of task placement and scheduling based on virtual machines has been discussed. Then, an algorithm TPVM is designed to work out the optimal scheme of the model, and an algorithm TEVM completes the execution of tasks in four layers. The experiments have been performed to validate the effectiveness of time estimated method and the feasibility and rationality of algorithms. It is seen from the experiments that our algorithms are better than other four algorithms in performance. The results show that the methodology presented in this paper has guiding significance to improve the efficiency of virtual computing systems.

• 제어로봇시스템학회논문지
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• 제15권4호
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• pp.439-444
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• 2009

Recently, a wide range of next-generation's game consoles has been developed by many game makers. Particularly, active interaction between users and games is required more than ever before for giving gamers the fullest pleasure. In this work, an infrared image sensor based position recognition system which can be used for virtual game interface is proposed. Furthermore, two kinds of compensation algorithms and Extended Kalman Filter are utilized to enhance the performance of the proposed system. The proposed system can effectively generate the position of the gamer in the face of the coordinate distortion and noise. To verity the feasibilities of the proposed system, various experiments are carried out.