• 한국광학회지
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• 제14권6호
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• pp.663-668
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• 2003

본 논문에서는 디스크형 기록매질에 이용될 수 있는 국소 홀로그램 기록방식을 연구하였다. 이 방식에서는 원통렌즈를 사용하여 기준빔을 얇은 두께로 집속하고, 그 집속된 곳에 신호빔을 쬐어 홀로그램을 기록한다. 기록매질을 기준빔의 스팟 크기보다 더 많이 이동시킴으로써 여러 개의 국소 홀로그램을 다중화한다. 국소 홀로그램 기록방식은 균일한 회절효율을 위하여 기록시간을 조절할 필요가 없다. 우리는 주어진 신호빔의 스팟 크기에 대해서 요구되는 최저의 기록매질 두께가 존재함을 보였다. Fe가 도핑된 2 mm 두께의 LiNbO$_3$광결정을 사용하여 데이터의 저장 및 복원 실험을 실행하였고, 20 bit/$\mu\textrm{m}$$^2$의 면적 저장밀도와 2.5${\times}$$10^{-3}$의 RBER(raw-bit error rate)을 얻었다.

• Tribology and Lubricants
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• 제15권1호
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• pp.52-58
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• 1999

Nano-indentation and nano-scratch tests were peformed to assess the mechanical and tribological properties of the coating on a commercially available thin-film magnetic recording disk. Surface topography and roughness of the disk was studied using atomic force microscopy. The hardness and elastic modulus data show a peak at an indentation depth equivalent to the thickness of carbon overcoat, indicating strong influence of the coatin $g_strate interaction and the coating surface roughness on the measurements. The variations of surface roughness data were analysed statistically based on the normal probability distribution theories and Weibull cumulative probability theories.es.

• 한국해양학회지
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• 제30권2호
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• pp.116-124
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• 1995

PC기반의 디지털 탄성과 시스템에 다중채널 수진기(6채널)를 연결하여 천해져 탄 성과 반사법 자료를 취득하고 이를 P에서 전산처리하였다. 자료처리 내용은 전처리, 너울효과보정, 주파수필터링, 이득회수, 디콘볼루션, 종합, 구조보정, 단면도작성 등 이다. 이러한 다중채널 디지털 자료취득 및 처리를 거친 최종 단면을 종래의 아날로그 기록계의 단면과 비교해 본 결과 다중반사를 포함하는 잡음이 제거 혹은 억제되고 신 호는 강화되었으며 해상도 또한 향상되었다. 종래의 아날로그 탄성과 장비에 결합하여 사용하는 천해저 다중채널 디지털 탄성과 시스템 및 자료처리 소프트웨어는 경제성이 높고, 아날로그 시스템에 비해 현장작업이 용이하면서도 양질의 지질정보를 효율적으 로 획득하게 해준다.

• 정보학연구
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• 제9권4호
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• pp.57-63
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• 2006

The intelligent elder brother groove network robot service the new broadband presence line is conversionce application service. Robot control data transmission hazard UDP packet of the remote control data which stands duplication necessary to transmit. TCP the error ratio to be high qualitative recording transmission pattern it of the transmission unit and is irregular the distance is distant to show and also the transmission lag is visible increases. The recording packet drop whose UDP degree error ratio will be high is frequent and does not arrive packet little by little increases is a possibility of knowing in the transmission unit. The technique which it proposes with traffic pattern of the transmission unit is visible the transfer characteristic of the same shape from 1% packet error ratio degree. The effective transmission technique of the robot control data which puts a base in UDP protocols was proposed from the present paper. Following research it leads and it follows the duplication transmission number of time in error rate of radio link and it was thought all that controls petty the research of the mechanism which progresses is necessary.

• 자동차안전학회지
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• 제13권4호
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• pp.60-65
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• 2021

The event data recorders (EDR) have been used as a device to help understand traffic accidents. With the recent development of autonomous vehicle (AV), it has become important to prepare the new EDR for AV. Therefore, the purpose of this study is to propose the direction of EDR-AV recording. First of all, the recent EDR data elements and the data elements of AV under discussion at UNECE WP29 EDR/DSSAD (Data Storage System for Automated Driving) were analyzed. The consumer complaint database in Motor Vehicle Recall Center in Korea was analyzed in order to utilize cases of domestic traffic accidents related to advanced driver assistance systems (ADAS). Consequently, problems with existing EDR were identified through unclear accident cases related to ADAS. In the future, it was proposed to record images in which the ADAS perception systems recognize the surroundings of the accident site as an EDR-AV recording item.

• 한국컴퓨터정보학회논문지
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• 제24권8호
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• pp.9-17
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• 2019

In this paper, we propose a block mapping technique applicable to NAND flash memory. In order to use the NAND flash memory with the operating system and the file system developed on the basis of the hard disk which is mainly used in the general PC field, it is necessary to use the system software known as the FTL (Flash Translation Layer). FTL overcomes the disadvantage of not being able to overwrite data by using the address mapping table and solves the additional features caused by the physical structure of NAND flash memory. In this paper, we propose a new mapping method based on the block mapping method for efficient use of the NAND flash memory. In the case of the proposed technique, the data modification operation is processed by using a blank page in the existing block without using an additional block for the data modification operation, thereby minimizing the block unit deletion operation in the merging operation. Also, the frequency of occurrence of the sequential write request and random write request Accordingly, by optimally adjusting the ratio of pages for recording data in a block and pages for recording data requested for modification, it is possible to optimize sequential writing and random writing by maximizing the utilization of pages in a block.

• 대한인간공학회지
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• 제16권1호
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• pp.119-126
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• 1997

Most of human factors experiments in nuclear industry domain produe lots of experimental data, thus much time is reauired to analyze the data. DAEXESS was developed to reduce resource demands necessary for the analysis work through systematic data analysis requirements and automated data processing based on computer technology. Physilolgical data, human behavior recording data, system log data and verbal protocl can be collected, synthesized and easily analyzed with with respect to time domain in DAEXESS so that analyser is able to look into inte- grated information on operating context. DAEXESS assists analyser to carry out qualitative and quantitative data analysis easily.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2007년도 The 1st International Symposium on Advanced Magnetic Materials
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• pp.112.2-112.2
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• 2007

• 한국광학회:학술대회논문집
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• 한국광학회 2008년도 하계학술발표회 논문집
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• pp.219-220
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• 2008

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2003년도 추계학술발표대회 요약집
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• pp.211.2-211.2
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• 2003