• Journal of Institute of Control, Robotics and Systems
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• v.13 no.11
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• pp.1112-1118
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• 2007

We propose a new-focusing method for test handlers of compact camera module (CCM), The MMD (max-min difference) method is applied to calculate the focus value quickly considering the noisy output of CCM. Also, the fuzzy search method is applied to find the maximum focus value effectively. We design a fuzzy processor to control the lens position by focus values and brightness values, which improves the focusing performance in the sense of speed and processor memory. The proposed method is implemented by computer program and installed at the CCM test handler machines. The simulation results are presented to verify the usefulness of the proposed method.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1992.04b
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• pp.466-475
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• 1992

ISDN으로 통합되고 있는 중요한 서비스 중의 하나가 데이터의 효율적인 전달을 위한 패킷모드 서비스이다. 이 패킷모드 서비스는 융통성이 있는 대역폭할당이 가능하고 하나의 물리적 채널을 동시에 복수개의 논리적 채널로 사용할 수 있다. CCITT권고안 X.31은 현존하고 있는 X.25패킷 터미날을 ISDN으로의 액세스를 지원하기 위한 두 가지의 시나리오를 설명하고 있다. ISDN교환기로서 개발되고 있는 TDX-10 전자교환기는 패킷처리기(Packet Handler)가 ISDN내에서 패킷모드 서비스를 제공하는 X.31의 Case B를 채택하고 있다. 본 논문에서는 모든 패킷 트래픽이 집중되어 처리되는 패킷처리기 역할을 하는 패킷처리 서브시스템(Packet Handling Subsystem)의 구조를 간략하게 설명하였다. 또한 TDX-10 패킷처리기의 성능을 제시하기 위하여 패킷처리기를 큐잉 네트워크를 이용하여 모델링하고, SLAM II를 사용하여 시뮬레이션을 수행하였다. 그 결과 부가된 트래픽 변화에 따른 각 프로세서의 CPU점유율 및 입력큐에서의 평균 대기시간, X.25호 요구 지연시간과 데이터 패킷 전송 지연시간등을 분석하고 이를 근거로 TDX-10 패킷교환시스팀의 패킷호 처리용량을 제시하였다.

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.10
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• pp.2606-2615
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• 1994

Sorting time is one of the most important issues for auto IC test handling systems. In actual system, because of too much path, reducing the computing time for finding a sorting path is the key way to enhancing the system performance. The exhaustive path search technique can not be used for real systems. This paper proposes heuristic sorting algorithm to find the minimal sorting time. The suggested algorithm is basically based on the best-first search technique and multi-level search technique. The results are close to the optimal solutions and computing time is greately reduced also. Therefore the proposed algorthm can be effectively used for real-time sorting process in auto IC test handling systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.6
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• pp.548-557
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• 1992

This paper presents how X.25 state machines are defined and procedures are implemented Into the TDI-10 switching system, which Is being developed as an ISDN exchange in Korea.Packet switching is an in important aspect of I SDN. Packet swichedd services in ISDN are defined by X.:31, which provides for the use X.f,j over ISDN B and D-channels between a user and an X.25packet handler. To implement X.2E into an ISDN exchange which Includes a packet handler, X.25state machines and procedures should be adj usted within the ISDN exchange.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.79-80
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• 2006

In order to raise productivity of the OLED and realization of the OLED TV, it is required to improve the design of the board size glass panel. The large-size glass substrate has some difficulties regarding its deflection during handling operation due to its small thickness (0.7t) which is not even enough to stand its mass itself. This paper is demonstrating a new solution of this difficult through clamping and bending end condition, which helps to minimize the deflection of the glass substrate.

• Journal of the Semiconductor & Display Technology
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• v.7 no.4
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• pp.23-28
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• 2008

A high speed automated pitch variation unit (HAPU) related to semiconductor category sorting movement of the test handler system was developed. In the design process, 'DMADOV' step of 6-Sigma method has been applied. The design result for the desirable pitch variation was a 3:1 reduction rack-pinion and a linkage which are operated by servomotors. The realization and reliability of the mechanism was obtained at the design stage by FEM analysis, and by robust design using Taguchi orthogonal array against weight and deformation. Finally, the validity of the high speed variation mechanism was confirmed via inspection using a high speed camera while performing pitch variation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.12
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• pp.2448-2457
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• 1994

CCITT recommendation X.25 and X.75 have been applied to the PSPDN environment for data communication of packet switching. They have also been used for packet switching in the ISDN exchanges since about the year 1980. This paper presents the throughput of the TDX-10 packet handler as simulating the performance based on memory management and flow control of the resource management algorithm designed originally.

• Proceedings of the Korea Society for Simulation Conference
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• 2000.11a
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• pp.174-179
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• 2000

Proposed in the paper is a V-FMS (Virtual Flexible Manufacturing System) model to be used as a prototyping tool for FMS design. The proposed V-FMS framework follows an object-oriented modeling (OOM) paradigm and is based on a set of user requirements for FMS prototyping. The V-FMS model consists of four types of object: virtual device, transfer handler, state manager and flow controller. A virtual device model, which corresponds to a static model in OOM, consists of two parts, shell and core, for reusability. A transfer handler corresponds to a functional model of OOM and it stores low level device commands required to perform job flow operations between giving and taking devices. The state manager and the flow controller constitute a dynamic model of OOM. The proposed V-FMS model has been implemented for a couple of linear type FMS-lines

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.338-341
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• 2003

최근의 인터넷 음악방송은 MP3 오디오를 기반으로 하는 TCP 프로토콜의 전송방식이 일반적이다. TCP방식의 전송은 HTTP 프로토콜을 이용한 파일 전송방식으로 네트워크의 부하가 급증할 경우 TCP의 특성으로 인해 음악의 끊김 현상이 발생하여 QoS 문제가 발생한다. 본 논문은 실시간 전송방식의 RTP(Real-time Transfer Protocol) 프로토콜을 이용하여 MP3 오디오 기반의 생방송 시스템 개발에 대한 연구로서, 기존의 TCP 방식의 음악의 끊김 현상을 개선하기 위한 모듈 구현을 목적으로 한다. 본 연구에서는 MP3 오디오 전송에 따른 QoS(Quality Of Service) 개선을 위하여 인터리빙 기법을 이용한 SPH/RPH(Send Payload Handler/ Receive Payload Handler) 모듈을 구현하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.765-766
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• 2010