• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권1호
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• pp.446-467
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• 2012

In this paper, the analysis and design of a motion simulator (based on the approach taken by interactive virtual reality (VR) entertainment systems) is conducted. The main components of the system include a bilateral control interface, simulation and a motion simulator control scheme. The space entertainment system uses a virtual environment that enables operators to feel the actual feedback sensing and distorted motion from the virtual environment, just as they would in the real environment. The space entertainment system integrates the dynamics of the motion simulator and the virtual environment and the operator maneuvers a steering wheel to interact with the system. The multiple bilateral control schemes employ a dynamical controller, which is designed by considering the velocity and acceleration that the operator imposes on the joystick, the environmental changes imposed on the motion simulator. In addition, we develop a calculated method to evaluate the Ratio of the simulation results. It is shown that the proposed control scheme can improve the performance of the visual entertainment system. Experiments are conducted on the virtual reality entertainment system to validate the theoretical developments.

• 한국정보과학회논문지:데이타베이스
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• 제35권1호
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• pp.1-16
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• 2008

센서 네트워크에 이용되는 데이타 스트림 관리 시스템에서는 한정적 정보들이 개별적으로 입력되기 때문에 종합적인 결과를 얻기 위해서는 상대적인 계산 비용이 높은 조인 연산자는 필연적으로 요구된다. 데이타 스트림은 잠재적으로 무한한 크기를 가지므로 조인 연산자는 슬라이딩 윈도우 제약사항을 가져야 함은 당연하다. 또한, 종합적인 결과를 얻기 위해 조인 연산자는 여러 입력을 취할 수 있어야 한다. 이를 가능하게 하는 것이 바로 슬라이딩 윈도우를 가지는 MJoin 연산자이다. 본 논문에서는 이러한 여러 MJoin 연산자가 시스템에 등록되어 있는 환경을 가정하고, 슬라이딩 윈도우를 가지는 MJoin의 특성을 반영하여 전역적으로 공유된 질의 처리 기법인 MMJoin 기법을 제안한다. MMJoin 기법은 첫째, 전역적으로 공유된 질의 실행 계획 수릴 문제, 조인 연산 결과에 대한 윈도우 갱신 문제 및 라우팅 문제로 나누어 다룬다. 이러한 연구의 노력은 데이타 스트림 환경에서 효율적인 다중 질의 최적화 및 처리 기법의 기초연구로 활용될 수 있다.

• 한국항만경제학회지
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• 제20권1호
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• pp.79-93
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• 2004

Recently, the change of shipping and port environment has required the new strategy from the liners, terminal operators, ports. The ports of call in the North American and European line also has changed as the Chinese ports made rapid advance. This seems to result from the fact that the trend of the container transportation by sea has developed the traditional concept, called port-to-port system that directly links between a port and another port into the network with complicated hierarchical structure reflecting costs, efficiency, and strategy of the Mega Carrier. This paper suggests the factors for Busan port to become the hub port of northeast Asia by analyzing the change of the liners' strategy along the change of the shipping and port environment, the global management of the operator of container port, and the amount of containers flowing in the northeast Asia.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1513-1518
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• 1996

A force reflecting hand controller can be used to provide more realistic information to the operator of a teleoperation system such as kinesthetic feedback from a slave robot. In this paper, a new design concept of a force reflecting 6-DOF hand controller utilizing the kinematic structure of a Stewart Platform is presented. Based on the optimal design technique of a Stewart Platform, a force reflecting hand controller has been designed and constructed to verify the technical feasibility of proposed design concept. In order to provide an operator with kinesthetic feedback information, a force mapping algorithm based on a reciprocal product of screws has been introduced. Finally, the technical feasibility of the design concept has been demonstrated through some of experimental results of the device under virtual environment on a real-time graphic system.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2005년도 한국컴퓨터종합학술대회 논문집 Vol.32 No.1 (B)
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• pp.424-426
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• 2005

임베디드 소프트웨어의 품질 향상을 위해 소프트웨어에 대한 테스트가 필요하다. 이때 임베디드 소프트웨어가 가진 다양한 제약성을 고려해야 하며, 이를 위해 시스템 수준에서의 테스트를 수행하는 것이 가장 적합하다고 할 수 있다. 시스템 테스트에서는 SUT(System Under Test)의 하드웨어 구성에 따라 센서, 스위치, 액추에이터 등이 시스템과 연결되어 작동하여야 한다. 특히 온도센서나 습도센서 등과 같이 외부의 환경정보를 시스템의 입력으로 사용하는 임베디드 시스템을 테스트하기 위해서는 테스트 자동화 도구 내부에 환경을 관리하고, 정해진 환경 시나리오에 따라 시스템에 입력을 주는 모듈이 요구된다. 본 논문에서는 임베디드 시스템에 구성되어 있는 센서의 기능을 대신하는 가상 환경 관리자(Virtual Environment Operator)를 설계하고 구현하였다. 구현된 가상 환경 관리자의 도입으로 테스트 스크립트의 간결화와 현실 세계를 반영하는 다양한 테스트가 가능한 테스트 환경을 구축하였다.

• 로봇학회논문지
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• 제15권2호
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• pp.160-168
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• 2020

There exists a popular belief that the elderly are more conservative than the younger people in acceptability of new technology. This study explores whether the generation gap in technology acceptance exists in the case of using telepresence robots, which project the presence and mobility of remote operator, for the universal purpose of social participation rather than for specific applications. Two groups of senior citizens and undergraduate students in their twenties personally experienced the telepresence robots operation and conducted a survey on how they perceived the social participation of a remote operator mediated by telepresence robot and to what extent the remote operator deserve equal rights to be treated as if one really exists in the local environment. The results show that the elderly have higher expectation on the role and functions of telepresence robots, and more favorable in principle for a remote operator to exercise equal rights by operating telepresence robot. It suggests that the stereotypes, the elderly lag behind younger generation in accepting new technology, is unlikely to fit into the telepresence robot market, for the elderly have more favor and support using telepresence robots as an universal avatar for social participation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.940-943
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• 1996

In teleoperating, as seeing the monitor screen obtained from a camera instituted in the working environment, human operator generally controls the slave arm. Because we can see only 2-D image in a monitor, human operator does not know the depth information and can not work with high accuracy. In this paper, we proposed a traded control method using an visual sensor for the purpose of solving this problem. We can control a teleoperation system with precision when we use the proposed algorithm. Not only a human operator command but also an autonomous visual sensor feedback command is given to a slave arm for the purpose of coincidence current image features and target image features. When the slave arm place in a distant place from the target position, human operator can know very well the difference between the desired image features and the current image features, but calculated visual sensor command have big errors. And when the slave arm is near the target position, the state of affairs is changed conversely. With this visual sensor feedback, human does not need coincide the detail difference between the desired image features and the current image features and proposed method can work with higher accuracy than other method without, sensor feedback. The effectiveness of the proposed control method is verified through series of experiments.

• 해양환경안전학회지
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• 제23권6호
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• pp.628-638
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• 2017

최근 국내 일부 항해사들은 해운산업의 어려운 취업환경을 극복하고, 직업선택의 저변을 확대하기 위하여 승선경력을 기반으로 국내외 교육기관에서 DP운항사 교육을 이수하여 직종을 전환하고자 노력하고 있다. 그러나 아직까지 국내에서는 해양플랜트 서비스 산업이 활성화 되어있지 않기 때문에 동 분야로 진출하고자 하는 항해사들은 어렵게 자격취득을 위한 실습을 마치고 대부분 해외선사로 진출하고 있다. 그럼에도 불구하고 DP운항사로 취업을 희망하는 항해사들은 경력을 중시하는 해외 해양플랜트 기업의 보수적인 채용 절차, 비영어권 출신자의 언어사용의 한계, 다문화 승선생활의 어려움, 필수 직무요건에 대한 체계적인 정보 부족 등의 이유로 구직 단계에서 부터 어려움을 겪고 있다. 따라서 이 연구는 DP운항사가 갖추어야 할 직무능력 및 자격 요건을 분석하여 국가에서 요구하는 최소한의 능력 수준을 제시하고 있는 NCS 표준 개발을 위한 기초자료를 제공하고, DP운항사 전문인력양성을 활성화하기 위한 방안을 제시하는 데 목적을 두고 있다. 본 연구의 결과로서, DP운항사의 직무 분류, 직무능력표준 및 경력개발경로를 제시하였고, DP운항사 양성 활성화 방안으로서 DP 실습선박의 공동 활용, DP 전문 교원 양성 및 정부주도 NCS 수출모델을 제안하였다.

• 제어로봇시스템학회논문지
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• 제19권10호
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• pp.928-935
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• 2013

In this paper, real-time polygon generation algorithm of 3D point cloud data and texture mapping for tele-operation is proposed. In a tele-operation, it is essential to provide more highly realistic visual information to a tele-operator. By using 3D point cloud data, the tele-operator can observe the working environment from various view point with a reconstructed 3D environment. However, there are huge empty space in 3D point cloud data, since there is no environmental information among the points. This empty space is not suitable for an environmental information. Therefore, real-time polygon generation algorithm of 3D point cloud data and texture mapping is presented to provide more highly realistic visual information to the tele-operator. The 3D environment reconstructed from the 3D point cloud data with texture mapped polygons is the crucial part of the tele-operation.

• 대한안전경영과학회지
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• 제15권4호
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• pp.63-72
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• 2013

Recent trends in rail industry can be characterized by the multifunctionality and very high-speed modes of operations. In particular, the adoption of the unmaned or operatorless operations has been getting increased attention in which case ensuring systems safety is crucial. On the other hand, according to the result of analyzing rail accidents, the human/operator errors have turned out to be one of the key causes of the accidents. Therefore, the effort of improving the work environment of locomotive cabs is quite necessary in order to decrease the accidents. The objective of this paper is studying on how to incorporate the factors related to the train operators in the design of the locomotive cabs and also on how to evaluate the design results obtained, which is subsequently reflected in the generation of the test and evaluation procedure. The approach taken is based on systems engineering, yielding the procedure document as a result. The results obtained in the paper can be useful in confirming the design of locomotive cabs utilizing the domestic human/operator measure. Also, the way of achieving the objectives can be utilized to cover the expanded rail systems development with appropriate design activities added.