• Journal of Biosystems Engineering
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• 제30권2호
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• pp.114-120
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• 2005

In this study, a biological reaction and measurement control system was developed to rapidly measure the insecticide imidacloprid residues in agricultural products. The biological reaction part of the system was designed to include micro-pumps and valves for fluid transport, and a polystyrene covet as a reaction chamber. The measurement control part of the system consisted of a photodiode with a light-emitting diode for optical density measurement, and a control microcomputer to implement assay. Signal output was read as the rate of change in optical density at 645 nm. The sensitivity of the system was 2.2 ng/mL ($IC_50$). The system could execute a measurement cycle in about 19 minutes. Research will be continued to develop an automatic sampler fur imidacloprid residues from agricultural products.

• 한국문헌정보학회지
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• 제45권4호
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• pp.297-308
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• 2011

This paper discusses the current situation of public libraries in Korea, from the viewpoint of Ranganathan's 'Five Laws of Library Science'. Public libraries have very rapidly grown in Korea in the past ten years. With an average growth rate of 5.8% per year, the number of public libraries reached to 703 in 2009, and the number of people served per library have gradually reduced every year, even if still far below other advanced countries. However, there are still some attempts to retrain people of their right to read whatever they want. In this paper, it is emphasized that in public libraries more attention and financial and strategic assistance should be given to the disadvantaged people, and the equal right to benefit from library services should be ensured. And the library as a growing organism should be balanced with the responsible library director, devoted librarians, and concerned people in the community.

• Journal of Biosystems Engineering
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• 제16권1호
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• pp.9-17
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• 1991

A dynamometer was designed and constructed to measure three directional forces and moments of pull type implement with eliminating the interference between the forces. The dynamometer consists of a linear motion bearing, self-aligning bearings, universal joints, and cantilevers where strain gages were attached. A data acuquisition system was developed to collect data and to analyze them. The data acuquisition system consists of the dynamometer, a potentiometer to measure the implement depth, strain amplifiers, a A/D converter, and an IBM-AT compatible microcomputer. Program, written in C language, was developed to read data from tranducers with given interval, to calculate forces and moments, to display them on screen, and to store them on disk. The calibration results showed that cantilevers had good linearity and there was no interference among directional forces. When applied loads were reduced with constant rate, hysteresis was appeared on the dynamometer. It might to be reduced by using ball bearings instead of self-aligning bearings.

• 대한의용생체공학회:의공학회지
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• 제21권2호
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• pp.109-118
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• 2000

본 논문에서는 일반적인 초음파 의료 영상 시스템에서 제공되는 단면 영상의 화질을 현저히 향상시킬 수 있는 영향 개선 기법들을 제안하였다. 제안된 기법들은 현재 대부분의 초음파 영상 시스템에 적용되는 접속기법과는 달리 한 프레임에 해당하는 RF 수신 신호들을 저장하고 합성구경 기법에 기반해서 수신신호들을 처리함으로써, 초음파 영상의 화질을 결정하는 주요 성능 변수인 해상도, 신호 대 잡음비, 주사속도 등을 개선시킬 수 있다. 제안된 기법들을 검증하기 위하여 RF 수신신호들을 저장할 수 있는 실험 장치를 제작한 후 실제 실험을 통하여 성능 평가를 수행하였다. 실험 결과 기존 시스템에 비해서 매우 우수한 영상을 얻을 수 있었으며, 시편 및 인체 데이터 경우에 모두 동일한 효과가 나타남을 확인 할 수 있었다.

• 반도체디스플레이기술학회지
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• 제19권3호
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• pp.112-117
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• 2020

NAND flash memory is a non-volatile memory that retains stored data even without power supply. Internal memory used as a data storage device and solid-state drive (SSD) is used in portable devices such as smartphones and digital cameras. However, NAND flash memory carries the risk of electric shock, which can cause errors during read/write operations, so use error correction codes to ensure reliability. It efficiently recovers bad block information, which is a defect in NAND flash memory. BBT (Bad Block Table) is configured to manage data to increase stability, and as a result of experimenting with the error correction code algorithm, the bit error rate per page unit of 4Mbytes memory was on average 0ppm, and 100ppm without error correction code. Through the error correction code algorithm, data stability and reliability can be improved.

• 디지털산업정보학회논문지
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• 제7권3호
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• pp.43-53
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• 2011

The many cities are changing in the city form where the person and nature are mixed. Namely, the government invests many expense in tree field of distance space for the change in the green city. In this paper, we design and implement a tree growth management system using PDA built in 13.56MHz RFID reader and CBD(Component Based Development) for ubiquitous computing environments. Our system provides history management to increase business efficiency for location coordinate of tree and history information of tree which using RFID, the RFlD tag is attaching the new tree and that is inputting GPS location information in PDA and provides tree information of tree by location coordinate to history management. Finally, we show from a performance analysis that our system achieves about 85% average tree read rate of RFID under test scenario environments.

• 제어로봇시스템학회논문지
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• 제13권12호
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• pp.1192-1197
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• 2007

This study proposes an automated pegboard utilizing the RFID system with multiple reader antennas for the rehabilitation services and the occupational therapy. The system automates the scoring by detecting the plugging correctness as well as the plugging status. It also aims to increase the patient's interest and the functional intelligence. The system was prototyped and the RFID read rate (over 99.998%) was confirmed. The system was also tested for the automatic capability of the scoring the session. The proposed system will be served as the typical example for the ubiquitous rehabilitation devices.

• 산업경영시스템학회지
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• 제18권36호
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• pp.71-82
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• 1995

The readability and the visuability are very significant when the letters or figures are displayed as static visual information. Not only is the beauty of the body type character(small letters) important but the display type character(large letters) should also be read easily, quickly and precisely. The issue regarding the readability in terms of perception of information has been raised continuously for all kinds of small signage and billboard, etc., which are written in display type within our everyday life. Among the various kinds of small signage and billboards the car licence plate is well known. Among all the possible factors that would have made an impact on the readability of licence plate, this paper focused on the effects of arrangement of character(letters and figures) and contrast of colors for the readability of licence plate using the within-subject analysis. The statistical analysis results in error reading rate, the character arrangement were significant but the color contrast(green/white, white/green, blue/white, white/blue, black/yellow) was not, No interaction was found.

• 정보저장시스템학회논문집
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• 제2권2호
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• pp.156-162
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• 2006

In this paper, we have investigated the disc warping in high-speed slim-type optical disc drive. The track density as well as high rotational speed of the information storage devices must be increased to enhance their recording capacity and data transfer rate. Generally, ODD used in the Lap-top computer has small inner space. So, the flow instability of the inner space is increased rapidly with its rotational speed. In extreme case, the flow instability may cause the malfunction of the read/write pick-up of drives. The experiments and numerical analysis were carried out for several cases and the result shows the influence of airflow to the disc warping.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.572-573
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• 2021

지능형 경로 이동 기능을 갖춘 드론을 이용하여, IoT형 열화상 기반 태양광 고장 검출 장비의 개발 및 드론과의 연동을 최적화하여 취득된 이미지 데이터의 실시간 분석을 통해 태양광 발전소의 고장 판독을 용이하게 함으로써, 태양광발전소의 발전율 향상과 효율적인 유지관리 모델을 만들 수 있는 기반 기술의 제시와 이미지 차감 분석기법을 이용하여 태양광 패널의 고장을 판독할 수 있는 시스템을 설계한다.