• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.1165-1169
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• 2003

This paper presents an approach to optimally design the air-bearing surface (ABS) of the optical flying head for near-field recording technology (NFR). NFR is an optical recording technology using very small beam spot size by overcoming the limit of beam diffraction. One of the most Important problems in NFR is a head disk interface (HDI) issue over the recording band during the operation. A multi-criteria optimization problem is formulated to enhance the flying performances over the entire recording band during the steady state. The optimal solution of the slider, whose target flying height is 50 nm, is automatically obtained. The flying height during the steady state operation becomes closer to the target values than those fur the initial one. The pitch and roll angles are also kept within suitable ranges over the recording band. Especially, all of the air-bearing stiffness are drastically increased by the optimized geometry of the air bearing surface.

• 한국CDE학회논문집
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• 제19권4호
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• pp.402-409
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• 2014

Presented in this paper is a scheduling method for semiconductor backend process considering the backward pegging. It is known that the pegging for frontend is a process of labeling WIP lots for target order which is specified by due date, quantity, and product specifications including customer information. As a result, it gives the release plan to meet the out target considering current WIP. However, the semiconductor backend process includes the multichip package and test operation for the product bin portion. Therefore, backward pegging method for frontend can't give the release plan for backend process in semiconductor. In this paper, we suggest backward pegging method considering the characteristics of multichip package and test operation in backend process. And we describe the backward pegging problem using the examples.

• 한국군사과학기술학회지
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• 제16권1호
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• pp.81-88
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• 2013

This paper describes the fundamentals, design, realization and test results of a BPSK(Bi Phase Shift Keying) transceiver for the direction finding proximity fuze sensor for anti-aircrafts or air missiles. The BPSK transceiver for the direction finding fuze sensor has been designed to detect a moving target by Doppler signal processing with the code correlation method and to distinguish direction by comparing received powers of each Doppler signal from adjacent three receiving antennas. The electrical and ESS(Environmental Stress Screening) tests of the BPSK transceiver showed satisfactory results and target detection and direction finding performances proved to be successful through dynamic operation tests by 155 mm gun firing.

• 수산해양기술연구
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• 제50권3호
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• pp.361-367
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• 2014

The aims of this study are to access the status and problems and draft possible solutions of Korean trawl fishery in New Zealand sea. The main target fish species for Korean trawlers in this sea were barracouta, blue mackerel, hake, hoki, jack mackerel, ling, oreo, orange roughy, southern blue whiting, spiny dogfish, squid and silver warehou. The Korean trawl fishery are suffering from a supply of seaman, continuous increasing coast of the counter partner, repair of vessel and seaman supply. It may be useful for getting over these difficulties to build a new trawler with a automatic operation system.

• Journal of information and communication convergence engineering
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• 제6권3호
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• pp.337-342
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• 2008

Controlling spillway gates of dams is a complex, nonlinear, non-stationary control process and is significantly affected by hydrological conditions which are not predictable beforehand. In this paper, control methods based on dynamic fuzzy control are proposed for the operation of spillway gates of dams during floods. The proposed methods are not only suitable for controlling spillway gates but also able to maintain target water level in order to prepare a draught. In the proposed methods, we use dynamic fuzzy control that the membership functions can be varied by changing environment conditions for keeping up the target water level, instead of conventional static fuzzy control. Simulation results demonstrate that the proposed methods based on dynamic fuzzy control produce an accurate and efficient solution for both of controlling spillway gates and maintaining target water level defined beforehand.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.313-314
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• 2006

Indicating product quantity by real time can be benefit both worker and management. Worker can compare real product quantity with its target and can adjust working speed to match with goal. Therefore, so called JPH equipment developed to indicate target quantity of product. As a main processor PIC16F877 was used and FND display were used to indicate current time, elapsed time, JPH value and target amount of product. Values like JPH and starting time, etc. are can easily be set by $4{\times}4$ numeric keypad and display datum likes target amount of product, current time and elapsed time, etc are displayed on FND by RS232 serial transmit. The operation of JPH equipment are tested and verified through long term test and are proved acting properly on working conditions.

• 한국군사과학기술학회지
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• 제15권5호
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• pp.651-659
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• 2012

Target operational availability setting is the first step to setting up a goal which a weapon system development project have to achieve and doing RAM analysis during whole life of a weapon system. It is important as a key factor to doing RAM analysis in the early phase of weapon system development. This paper present a methodology to set a target operational availability for, especially, a warship when it develop. This methodology uses Operational Mode Summary/Mission Profile(OMS/MP) of the developing warship and RAM analysis results of similar warships to calculate wartime and peacetime target operational availability. It will be used in early phase of not only warship development but also army or aircraft weapon systems when these develop.

• 한국군사과학기술학회지
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• 제15권5호
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• pp.586-593
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• 2012

The Navy is in the process of developing a sonar-operation strategy to increase the effectiveness of underwater target searching capability. HMS is the basic strategy to detect underwater targets. The advantages of HMS is that, it has a short preparation time to operate and can be always used regardless of sea conditions and weather. However, it is difficult to effectively detect underwater targets due to the interaction between marine environments and sonar-operations. During the research, the effectiveness of the HMS system's underwater target searching capability was analyzed by integrating various search and defense patterns, and environment conditions into the simulation. In the simulation the ship search an evasive target within a set region. The simulation presented results for an effective searching and defense methods of underwater targets. These research results can be used as foundation for advancing and improving the sonar operational tactics.

• 한국음향학회지
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• 제39권6호
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• pp.549-558
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• 2020

본 논문은 수상 및 수중 표적에 대한 수동소나 협대역추적의 자동초기화 견실성을 향상시키는 기법을 다루었다. 수동소나에서 탐지데이터를 활용하여 표적으로서 자동 판별 및 추적하는 경우에 탐지데이터 내 다수의 클러터에 의하여 클러터가 표적으로 판별 및 추적되며, 이는 운용자의 관심표적에 대한 인지를 방해한다. 수동소나에서 관심표적에 대한 자동 표적 판별 및 추적은 유지하면서 클러터에 대한 자동 표적 판별 및 추적은 감소하기 위하여 탐지 데이터 측정치의 연계 확률과 신호준위에 대한 정보 엔트로피를 산출한다. 탐지 데이터에서 추출한 측정치의 연계 확률과 정보 엔트로피가 사전 설정 조건을 만족하면 자동초기화 절차를 실시한다. 해상실험 데이터를 활용하여 시뮬레이션을 실시하였고, 기존 적용 기법에 대비하여 실표적에 대한 자동 추적은 유지하면서 클러터를 자동 추적하는 경향이 감소 하였다.

• Journal of Astronomy and Space Sciences
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• 제24권4호
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• pp.379-388
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• 2007

위성 영상의 Modulation Transfer Function(MTF) 성능은 위성 영상 활용에 있어서 매우 중요한 성능 지표 중 하나이다. 이러한 이유로 위성이 발사된 이후 초기 운영 단계에서 지상 관측 영상을 이용하여 성능을 확인한다. 그러나 지상 관측 영상을 이용한 MTF 성능 측정 방법은 날씨나 구름 등의 관측 조건에 많은 영향을 받는다. 이 논문에서는 위성 영상의 MTF 성능을 측정하는데 있어서 별을 사용하는 경우 필요한 시스템 요구사항과 위성 운영 개념을 도출하는 것을 내용으로 한다. 지상 관측용으로 설계된 위성을 이용한 별 관측 수행 가능성 분석과 별 관측 영상의 유효성 분석을 수행하였다. 이 논문에서 제시한 별 관측을 위한 위성 운영 방법은 저궤도 지구 관측 위성 영상의 MTF 성능 확인에 유용하게 사용될 수 있을 것으로 판단한다.