• Transactions of Materials Processing
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• v.9 no.6
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• pp.598-603
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• 2000

In order to improve trial-and-error based conventional practices for optimizing forming processes, a direct design method to guide iterative design practices, called the ideal forming theory, has been previously developed. In the theory, material elements are required to deform following the minimum Plastic work Path. The theory can be used to determine the ideal initial blank shape needed to best achieve a specified final shape while resulting in optimum strain distributions. In this work, the direct design method based on the ideal forming theory was applied to design initial design shape for VCR deck chassis. Based on the solution of the ideal forming theory, FEM analysis was utilized to evaluate an optimum blank shape to be formed without tearing. Simulation results are in good agreement with experimental data. It was shown that the proposed sequential design procedure based on direct design method and FEM can be successfully applied to optimize the die design Procedure of sheet metal forming processes.

• Journal of Biomedical Engineering Research
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• v.18 no.2
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• pp.121-126
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• 1997

Endoscopy has become a crucial diagnostic and therapeutic procedure in clinical areas. Over the past three years, we have developed a computerized system to record and store clinical data pertaining to endoscopic surgery of laparascopic cholecystectomy, pelviscopic endometriosis, and surgical arthroscopy. In this study, we developed a computer system, which is composed of a frame yabber, a sound board, a VCR control board, a LAN card and EDMS(endoscopic data management software. Also, computer system has controled peripheral instruments such as a color video printer, a video cassette recorder, and endoscopic input/output signals(image and doctor's comment). Digital endoscopic data management system is based on open architecture and a set of widely available industry standards, namely: windows 3.1 as a operating system, TCP/IP as a network protocol and a time sequence based database that handles both images and doctor's cotnments. For the purpose of data storage, we used MOD and CD-R. Digital endoscopic system was designed to be able to store, recreate, change, and compress signals and medical images.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.24 no.67
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• pp.77-82
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• 2001

A study was conducted to develop a better classification method of Consumer Attributes that can enhance user-centered product design process. A modified QFD(Quality Function Deployment) survey form based upon Fuzzy set theory was proposed which contains 9 steps of importance level, and Certainty and Necessity function to improve the reliability of extracted consumer attributes. To verify the betterment and advantage of proposed classification method, a series of questionnaire survey was performed. Thirty male and 30 female university students were participated in the survey using a VCR as a target product. The result of the study showed that 80% of subjects were preferred the proposed classification over existing method. A cluster analysis was performed to further verify the betterment of the proposed method. The result also supported that the proposed classification method is more reliable and enhanced method in extracting consumer attributes and can be applied in the product design.

• Proceedings of the Korea Association of Crystal Growth Conference
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• 1996.06b
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• pp.281-283
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• 1996

전자제품의 경박 단소화에 필수 부품인 칩저항기, HIC 등의 제조 기술은 급속한 성장을 이룬 반면에 가장 중요한 특성을 발현하는 전극 재료 및 저항 재료의 제조는 기술적으로 취약한 부분이다. RuO2와 Pb2Ru2O5.5는 저항 페이스트의 가장 중요한 원재료로서 저항 편차, 온도저항계수(TCR), 전압저항계수(VCR), NOISE 등의 전기적 특성과 페이스트이 흐름성, 보존 안정성 등의 작업성에 큰 영향을 미친다. 외국에서 산화 루테늄 분말 제조에 대한 많은 연구가 진행되어 오고 있으나 대부분 출발 물질을 염화 루테늄을 사용하여 RuO2 분말을 제조하고 있다. 이렇게 제조된 RuO2 분말은 전자 재료에 악영향을 미치는 염소이온이 잔류할 가능성이 높다. 본 연구에서는 Ru metal에서 루테늄산염을 만들어 위의 문제를 최소화 하였고, 전기적 특성이 우수한 고분산 초미립의 RuO2를 얻기 위해 산화, 환원, 정제, 배소 등의 제조 공정에 있어서 최적 조건을 고찰 하였다.

• The Transactions of the Korea Information Processing Society
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• v.6 no.10
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• pp.2642-2648
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• 1999

This paper describes a DAVIC based VoD service system that allows access via the Web, taking advantage of the wide availability of Web browsers. A simple access mechanism of a DAVIC based VoD system, using a Web browser is adopted on the proposed system. The client and VoD server are compliant with DAVIC, a user can access the VoD server simply by selecting the Web server's address via a Web browser. A menu enables the user to select VCR-like buttons, to establish an S2 control flow and to send the commands contained in the buttons to the VoD server. A simple implementation shows the feasibility of the proposed approach.

• The Transactions of the Korea Information Processing Society
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• v.4 no.10
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• pp.2421-2433
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• 1997

In this paper, based on the relative logical storage cost of each movie by the difference of service request probability, we propose and implement the SDU(Separate Data Use) method and the EDU(Existing Data Use) method to provide FF(Fast Forward) and FR(Fast Reverse) function in efficiently through analysing MPEG bit stream and frame characteristics. By selecting and applying the FF/FR function providing method based on the service request probability of movie, the proposed method can reduce the cost of FF/FR functions for total serviced movies.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.331-334
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• 2006

최근 VCR과 DVD 플레이어 이후에 많은 주목을 받고 있는 Divx Player는 수많은 종류의 상품들로 전성기를 맞이하고 있다. 이러한 Divx Player는 다양한 상품의 홍수 속에서 이미 충분한 하드웨어, 소프트웨어적 발전을 이루었다. 따라서 엇비슷한 성능의 상품들 속에서 소비자에게 돋보이기 위해서 차별화된 디자인과 편리한 UI(User Interface)가 필요하게 되었다. 이러한 UI 디자인을 구성하는 다양한 방법 중에 웹문서를 조작하듯이 쉽고 편리하게 UI를 수정할 수 있는 XML 파싱이 크게 각광받고 있다. 따라서 본 논문에서는 이러한 Divx Player의 UI를 구성하는 XML의 기능과 그에 관련한 리모컨 조작의 연관성과 그 동작에 관하여 설계 및 구현을 하였다.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10a
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• pp.129-132
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• 1996

There is a tendency nowadays to produce increasingly miniaturized electronic equipment which incorporate parts that have to be precisely positioned, like lenses, heads and CCD's in scanners, printers, copiers, VCR's, optical fiber modules, etc. In contrast to the production process of precision parts, which is currently being carried out automatically, the assemblage process is still being performed by specially skilled technicians. The assemblage process comprises normally the following steps: firstly, the parts are roughly positioned and partially fixed, secondly, the parts are manually nudged towards the target position and finally glued, screwed or welded. This paper presents a system that uses six piezo Impact Drive Mechanisms for accurate micro positioning within three degrees of freedom (lateral and longitudinal translation and rotation). The system is designed to positioning a printed circuit board with an accuracy better than 3 .mu.m (for translations), 5 mrad (for rotation).

• Korean Journal of Veterinary Research
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• v.42 no.3
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• pp.403-410
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• 2002

This study was performed to investigate the general prepartum behavioral ethogram of Bos taurus coreanae (Hanwoo cow). In this study, 4 pregnant cows were placed in a separate area. We recorded the behaviors of the cows using time lapse VCR for 48 hours and analyzed behaviors with the scan point sampling method. We observed maintenance behaviors, social behaviors and ingestion behaviors. During the observation period, the time budgets of behaviors in order of frequency were LD(lying down, 38.2%), ST(standing, 24.7%), EA(eating, 10.7%), WA(walking, 7.2%), LR(lying down rumination, 5.6%), SR(standing rumination, 3.3%), TW(tail wagging, 3.1%) and SG(self grooming, 1.8%). The time budgets of the other behaviors such as PG(pairwise grooming), FC(fly catching) were negligible (<1%).

• The KIPS Transactions:PartA
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• v.9A no.2
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• pp.137-146
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• 2002

In VOD server, in order to guarantee playback of continuous media, such as video, without hiccups for multiusers, the server has to manage its buffer sophisticatedly by prefeching a part of the data into the buffer As the continuous media data buffered by one user can be used again by the others, the number of disk accesses is reduced and then the latency time far the users is also reduced. In this paper, we propose a new buffer management technique for continuous media in VOD server. Our basic algorithm partitions the buffer into groups and then a group of buffer which has the lowest utilization is chosen and partitioned again for a new user. The basic algorithm is extended for supporting multiple streams and clip data and for providing VCR functions. Our proposed technique is able to increase in the number of concurrent users as increasing the utilization of the buffer and to minimize the average waiting time for multiuser accesses as the bandwidth of storage is slowly reached to the limit. In the simulation study for comparing the performance of our technique with that of the existing techniques, we show that the average waiting time is reduced mere than 50% and the number of concurrent users increases by 1 ∼5% as compared with those of the exiting techniques.