• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.241-245
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• 2004

This paper shows the development of remote control system for manipulators which consists of PHANToM Device as a master, Samsung FARA robot as a slave and TCP/IP based LAN for their Communication. This work includes the motion mapping between the master and the slave, Generation of virtual viscosity force preventing operator s unwilled action and 3D remote control simulators for the stable operation of the remote control system, etc. The remote control implementation has been performed and the results shows that the developed system can allow the operator to effectively control the manipulator.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.595-597
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• 2005

This paper shows the development of remote control system for manipulators which consists of PHANToM Device as a master, Samsung FARA robot as a slave and TCP/IP based LAN fortheir Communication. This work includes the motion mapping between the master and the slave, Generation of virtual viscosity force preventing operator's unwilled action and 3D remote control simulators for the stable operation of the remote control system, etc. The remote control implementation has been performed and the results shows that the developed system can allow the operator to effectively control the manipulator.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2000.10a
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• pp.40-47
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• 2000

One of the drawbacks of GA-based structural optimization is that the fitness evaluation of a population of hundreds of individuals requiring hundreds of structural analyses at each CA generation is computational too expensive. Therefore, a parallel genetic algorithm is developed for structural optimization on a cluster of personal computers in this paper. Based on the parallel genetic algorithm, a population at every generation is partitioned into a number of sub-populations equal to the number of slave computers. Parallelism is exploited at sub-population level by allocationg each sub-population to a slave computer. Thus, fitness of a population at each generation can be concurrently evaluated on a cluster of personal computers. For implementation of the algorithm a virtual distributed computing system in a collection of personal computers connected via a 100 Mb/s Ethernet LAN. The algorithm is applied to the minimum weight design of a steel structure. The results show that the computational time requied for serial GA-based structural optimization process is drastically reduced.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.211-213
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• 2003

가상랜(VLAN:Virtual LAN) 기술은 멀티 캐스트 트래픽의 감소 효과가 크고, 효율적인 네트워크 보안 및 관리를 지원하므로, 대부분 최근의 상용 스위치는 가상랜 환경에서의 동작을 지원하고 있다. 가상랜 환경에서 동작하는 스위치에서 가상랜 정보를 주고받기 위하여 사용하는 프로토콜이 GARP/ GVRP(Generic Attribute Registration Protocol/GARP VALN Registration Protocol)이다. 이 프로토콜은 네트워크 환경에서 가상랜 정보가 바뀔 때마다 동적으로 각 스위치의 가상랜 정보를 설정해 줌으로써 네트워크 관리자의 수고를 덜어주며, 효율적으로 가상랜을 관리하는 방법을 지원하는 것이다. 따라서 가상랜 환경에서 동작하는 스위치는 대부분 GARP/GVRP를 내장하고 있으나, 범용 소스가 없이 생산업체 별로 자체 구현한 GARP/GVRP를 각각의 스위치에 탑재하고 있다. 본 논문은 이렇게 가상랜 환경을 지원하는 스위치에 필수적인 프로토콜인 GARP/GVRP를 리눅스 커널에 삽입 가능한 모듈 형태로 개발하였다. 또 개발한 모듈을 기가빗 이더넷 스위치(Gigabit Ethernet Switch)에 이식된 리눅스 커널에 삽입. 동작시키고 공인된 테스트 집합을 이용하여 프로토콜이 정확하게 동작함을 검증하였다.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.109-113
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• 2003

기존의 VOB(Virtual Output Buffer) 모델에서 신경회로망의 학습 패턴 처리를 위해 가상 셀 손실율이 도입되었다. VOB 모델은 신경망이 실제 셀 손실율 없이도 연결 수락 경계를 잘 찾을 수 있음을 보여주었다. 그러나 VOB 모델은 셀 손실율을 과다 평가하는 경향이 있어 결과적으로 망 자원의 이용률이 낮은 단점이 있다. 된 논문에서는 이러한 단점을 보완하는 방법으로 연결 수락 경계에서 셀 손실율의 평균에 대한 정보를 충분히 포함하는 셀 손실율 참조 곡선의 개념을 제안하였다 그리고 제안된 셀 손실을 참조 곡선을 이용하여 가상 셀 손실율을 처리하는 방법을 제안하였다. 제안된 학습 패턴 처리 방법은 ATM 트래픽 중에 가장 대표적인 두 가지 호원에 대하여 실험하였다. 실험에 사용된 호원은 LAN 데이터의 트래픽 특성을 가지는 On-Off 트래픽과 비디오 화상 통신의 특성을 가지는 Auto-Regressive 트래픽이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.481-482
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• 2009

늘어나는 고품질 멀티미디어 서비스를 위해 이더넷 상에서 시간에 민감한 서비스들의 안정적인 전송을 위해 많은 연구가 진행 중에 있으며, 시간에 민감한 트래픽들의 저지연성을 보장하기 위한 한 방법으로 특정 트래픽에 대한 대역폭 예약 방법이 있다. 현재 IEEE 802.1Qat 진행중인 MSRP(Multiple Stream Registration Protocol)에서 서비스에 대한 대역폭 예약 실패에 대한 처리방법이 완전하지 않기 때문에 기존의 MSRP에서 발생할 수 있는 대역폭 예약 실패 상황에 대한 처리방법을 제시하여 좀 더 안정성 있는 예약 시스템을 제안한다. OPNET으로 구현한 시뮬레이션 모델을 이용하여 제안한 방법과 기존의 방법간의 네트워크 사용률을 비교한다.

• International Journal of Computer Science & Network Security
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• v.23 no.1
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• pp.71-77
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• 2023

In the current Internet system, there are many problems using anonymity of the network communication such as personal information leaks and crimes using the Internet system. This is why TCP/IP protocol used in Internet system does not have the user identification information on the communication data, and it is difficult to supervise the user performing the above acts immediately. As a study for solving the above problem, there is the study of Policy Based Network Management (PBNM). This is the scheme for managing a whole Local Area Network (LAN) through communication control for every user. In this PBNM, two types of schemes exist. As one scheme, we have studied theoretically about the Destination Addressing Control System (DACS) Scheme with affinity with existing internet. By applying this DACS Scheme to Internet system management, we will realize the policy-based Internet system management. In this paper, to realize it, concept of the Internet PBNM Scheme is proposed as the final step.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.7
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• pp.1445-1451
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• 2005

Home-Network is an integrated network of the PC and all electric home appliances in the home so that they can communicate with each other. In the 21th century, here are various technology for Home Network environment such as HomePNA, IEEE 1394, Ethernet Lan and Bluetooth. For Home Network construction, generally, the standard series interface 'RS232' is used to make communication possible between electric home appliances. However Home network using RS232 has a problem. That is, All machines have to be connected to each other with RS232 using Point-to-Point mode. In this case, the system becomes complicated because we have to use circuits as much as there are machines and increased expenses. To improve this problem, In this thesis, designed home network using RS422 Multi-drop mode serial communication and controled it with embedded linux system. And connected RS422 with motors and sensors using PIC to make the home network virtual environment.

• Journal of Advanced Navigation Technology
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• v.21 no.2
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• pp.206-211
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• 2017

Recently computing devices by connecting to a network, grid computing, the next generation of digital neural networks that provide maximum service will connect all of the computer such as a PC or server, PDA into one giant network makes the virtual machine. Therefore, we propose the grid computing implementation model to be applied to meteorological business field as follows. First, grid computing will be used for tasks such as the development of numerical models below the mid-scale or test operations, and the final backup of the weather supercomputer. Second, the resources that will constitute grid computing are limited to business PCs and Linux servers operated by the central government considering operational efficiency. Third, the network is restricted to the LAN section, which suggests the implementation of high performance computing.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.512-516
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• 2005

Home-Network is an integrated network of the PC and all electric home appliances in the home so that they can communicate with each other. In the 21th century, here are various technology for home Network environment such as HomePNA, IEEE1394, Ethernet Lan and Bluetooth. For Home Network construction, generally, the standard series interface 'RS232' is used to make communication possible between electric home appliances. However Home network using RS232 has a problem. That is, All machines have to be connected to each other with RS232 using Point-to-Point mode. In this case, the system becomes complicated because we have to use circuits as much as there are machines and increased expenses. To improve this problem, In this thesis, designed home network using RS422 Multi-drop mode serial communication and controled it with embedded linux system. And connected RS422 with motors and sensors using PIC to make the home network virtual environment.