• Journal of Drive and Control
• /
• v.8 no.1
• /
• pp.40-43
• /
• 2011

• Journal of Drive and Control
• /
• v.8 no.1
• /
• pp.44-49
• /
• 2011

• Journal of Drive and Control
• /
• v.12 no.1
• /
• pp.45-52
• /
• 2015

• Journal of Drive and Control
• /
• v.6 no.1
• /
• pp.29-37
• /
• 2009

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2000.04a
• /
• pp.36-39
• /
• 2000

급변하는 소비자의 욕구를 만족시키고 이에 신속하게 대처하기 위해 Agile manufacturing 이나 Flexible manufacturing system에 관한 연구가 활발히 전개되어 왔다. 또한 최근에 급속한 컴퓨터 관련 하드웨어의 발달의 인해 시스템 내부에 사용되는 장비 제어를 PC based controller 로 바꾸려는 움직임이 일고있다. 이러한 PC based controller가 전용 컨트롤러의 모든 기능을 수행하기란 아직은 한계가 있으나 점차 그 사용이 보편화될 것이며, 더욱이 컴퓨터 하드웨어의 놀라운 기술 발전으로 인해 앞으로는 여러 대의 장비를 한 대의 컨트롤러로 제어할 수도 있을 것이다. 본 연구에서는 이러한 환경에 민첩하게 대응하기 위해서 우선 각 장비별로 컨트롤러와의 통신을 위한 message 를 종합하고 이를 체계적으로 분류하도록 하며, 이렇게 분류된 각 message 들이 PC 기반의 콘트롤러에 줄 수 있는 load 를 계산하는 방법을 제시한다. 본 연구를 통해 컨트롤로의 각 장비를 제어함에 있어서 걸리는 작업 부하를 수치적으로 계산해 냄으로써 앞으로 제어할 장비를 무리 없이 컨트롤하기 위한 최적의 컨트롤러를 구성하는데 도움이 될 것이다.

• KIEAE Journal
• /
• v.10 no.6
• /
• pp.33-39
• /
• 2010

Visual Environment and productivity are correlated. So we need to create a comfortable visual environment and maintain proper workplane illumination level. We can obtain lighting energy savings and comfortable visual environment using daylight and LED lights. In this study, we characterized the indoor illuminance level according to the sky condition and proposed dimming control strategy of LED lights. Energy savings in On/Off control mode are 40% at clear sky and 28% at intermediate sky. In dimming control mode, energy savings are 77.2% at clear sky and 64.1% at intermediate sky. Then we obtain the appropriate dimming control strategy of LED lights based on data. Dimming rates are 0-14.2-80(min-avg-max, %) for LED 1, 0-19.9-60% for LED 2 and 30-61.4-90% for LED 3. Lighting energy savings are 68.2% for LED dimming system applied this control method.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07a
• /
• pp.559-561
• /
• 2005

최근 실시간 멀티미디어 어플리케이션을 장소에 구애 없이 서비스 받으려는 요구가 증대되었다. 무선 환경에서의 이러한 서비스 요구는 전송 데이터의 규칙적인 전송간격과 지연과 대역폭 보장이 필요하다. 본 논문에서 망 상태와 장비 특성이 고려된 실시간 멀티미디어 서비스에서 QoS를 지원하는 하이브리드 플로우 컨트롤 메커니즘과 시스템 아키텍쳐를 JMF(Java Media Framework)를 이용하여 설계하고 구현한다. 하이브리드 플로우 컨트롤 메커니즘은 망 상태 정보와 사용자 특성을 고려한 메트릭스를 이용하는 수정된 AIMD이 기본이 된다.

• The Journal of Society for e-Business Studies
• /
• v.25 no.2
• /
• pp.99-108
• /
• 2020

Unlike a general IT environment, an industrial control system is an environment where stability and continuity are more important than security. In the event of a security accident in the industrial control system, physical motion can be controlled, so physical damage can occur and physical damage can even result in personal injury. Cyber attacks on industrial control systems are not simply cyber damage, but terrorism. However, the security of industrial control systems has not been strengthened yet, and many vulnerabilities are actually occurring. This paper shows that the PLC can be remotely controlled by analyzing the connection process and packets for the PLC protocol used in the industrial control system and bypassing the security mechanism existing in the protocol. Through this, we intend to raise the security awareness of the industrial control system.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.14 no.2
• /
• pp.105-111
• /
• 2015

Car manufacturers and part manufacturers each have their own criteria with regard to strength, stiffness and NVH performance levels. Part manufacturers typically investigate such performances according to the part unit. To do this, the part manufacturer receives information from the relevant car maker. However, the information provided by the car maker is limited, making it difficult to develop a part which meets all of the design requirements specified by the car unit overall. To overcome this difficulty, the utilization of a VPG system is recommended for the designer. In this study, the durability performance of an optimized control arm as suggested in a previous study was investigated using the ETA-VPG, LS-dyna and FE/safe software packages. ETA-VPG provides several types of suspension and steering parts. In this study, a complete car is created using the library included in ETA-VPG, with the exception of the control arm. We also conducted a virtual proving ground analysis to predict the life cycle of the control arm.

• Journal of KIISE:Computer Systems and Theory
• /
• v.33 no.4
• /
• pp.205-215
• /
• 2006

Pen-input displays, such as LCD tablets and tablet PCs, are already popular for its usability in CAD design, in particular. in concept design phase. We propose an intuitive B-Spline modification scheme that can be used for the CAD systems targeting for such devices. Differently from the control point based modification schemes for the B-splines, our scheme relates user pen marking to determining the final shape of the target curve and surface. This, eventually, reduces time for interacting with the shape parameters (i.e., by control points or direct manipulators), which has been regarded as an unavoidable routine tasks for design. To prove its usability, we made an experiments with selected subjects who have been working for industrial design.