• Journal of Biosystems Engineering
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• 제34권6호
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• pp.404-410
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• 2009

This study was carried out to develop a self-propelled type explosive subsoiler for improving the root zone soil conditions in orchard and other forest fields. Prototype was designed to be able to inject air and other soil improving material such as lime into soil at the same time, and thus improve the air permeability and drainage of orchard soils to promote the root growth of tree for high quality fruit production. Soil penetration device of explosive subsoiler is composed of air hammer, penetration rob and air injection nozzle. To support the soil penetration device of explosive subsoiler to penetrate vertically, modified Scott-Russel mechanism was used. Timing control device for simultaneous injection of soil improving material with air was attached to the out side wall of air cylinder and as the cylinder move, the soil improving material was injected into soil at the same time. Turning radius of prototype was 2.2-2.3 m with good mobility in sloped land. It took approximately 1 minute for lime injection system to reach the optimum pressure of 9.9 kg/$cm^2$, average 10-20 seconds were required to rupture soil with the depth of 50 cm and 2-3 seconds were required for explosion, so all in all about 1 minute and 20 seconds were required for one cycle of explosion. Maximum soil rupture depth and diameter were 50 cm and 3-4 m respectively depending on the soil type and soil moisture content. For final design of explosive subsoiler inclination angle of lime hopper was increased from 60 degree to 70 degree and the shape of hopper was changed from rectangular cone to circular cone to solve the clogging problem of lime at out let. Agitating system operated by compressed air was attached to the metering device of the prototype, thus more than 90 cc of lime was discharged per cycle from metering device without clogging problems.

• 기술사
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• 제33권4호
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• pp.63-67
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• 2000

Presently, Weekend Buses only lane system is in force in Gyung-Bu Highway causes traffic delay at the northern of Su-won IC and have reduced the efficiency of Highway. To solve this problems, Buses only lane system is working at the northern of Su-won IC should be charged over from Median Buses only lane system to Curb Buses only lane system. It makes good effects on reducing weaving occurs when cars change lane, traffic accidents, ease control on violation cars, improving Level of Service in the Ramp, etc.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1997년도 학술대회
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• pp.101-106
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• 1997

Palplus system is a new European 16:9 wide screen TV format which has a full compatibility with standard PAL and the system has a advantage of improving picture quality by the reduction of cross color and cross luminance as well as making use of the full horizontal luminance bandwidth of the PAL system. We implemented European 16:9 PALplus Digital decoder(625/50/2:1) system using SVP(Serial Video Processor) IC and discrete helper demodulator.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.584-587
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• 1995

Recent development in the digital relay technology has introduced the adaptive relaying system which adopts the relays to the current operating states. This paper proposes the hierarchical digital protection system whose design has been based on 154 kV S/S. Applying the newest communication networking, the system provides the new protection capabilities improving the system reliability and speed.

• 한국컴퓨터정보학회논문지
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• 제28권12호
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• pp.137-145
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• 2023

본 논문에서는 보안성과 안정성을 유지하면서 함정 전투관리체계의 생존성을 향상시키는 체계접근통제 소프트웨어를 제안한다. 함정 전투관리체계를 구성하는 체계접근통제 소프트웨어의 운용 환경 구성 및 사용자 인증 프로세스 개선, 함정 전투관리체계 운용 환경 분류 정의, 부하율을 고려한 소프트웨어 병렬 실행 프로세스를 적용하여 체계접근통제 소프트웨어를 개선하였다. 이를 통해, 환경 구성에 필요한 대기시간을 단축하여 운용자에게 신속한 운용을 제공하고, 긴급한 상황 속에서도 환경 구성이 완료되지 않으면 함정 전투관리체계를 운용할 수 없는 점을 개선하고자 한다. 그리고 성능을 시험하기 위해 기존 함정전투관리체계를 모의하여 시험환경을 구성하였으며, 운용 분류 별 실행시간을 측정하여 비교하였다. 기존 함정 전투관리체계 대비 기본 전투관리체계 실행시간은 약 69.3% 감소하였으며, 교전 전투관리체계 실행시간은 약 54.9% 감소하였으며, 통합 전투관리체계 실행시간은 약 8.4% 감소하였음을 확인하였다.

• 품질경영학회지
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• 제32권3호
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• pp.94-108
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• 2004

TQM has been applied to the industry area regardless of the size of company. BNQA model should be identically applied to large companies and small & medium-sized company. However, there are many evidences that TQM model should be modified according to the size of company. In this study, we analyzed the practice of TQM in Korean small & medium-sized Company. Also, we tried to give some suggestions for improving the competitiveness of the small & medium-sized company. The result of this study is that leadership, work system, education and strategy development should be improved in domestic companies, and work system, education and strategy deployment should be improved in foreign companies.

• Asia pacific journal of information systems
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• 제20권3호
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• pp.91-114
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• 2010

An IT system within a company play increasingly important role as a significant part of corporate assets. The IT system possesses an extraordinary ability to improve an organization's efficiency, effectiveness and productivity by providing competitive advantages and improving strategic business decision capabilities. Indeed, providing a more secure IT environment, improving employee productivity and enhancing business process and strategic decision capabilities are key areas to improve corporate performance. However, existing research on IT ROI of return on IT investments does not provide solid justification to stakeholders. In this paper, we analyze the IT investment during the past 28 years from 1982 to 2009 and present the results in two dimensions. First, we show the IT solution implementation analysis by years and industries based on 1,240 IT success cases from 8 different sources such as major Korea IT newspaper, IT magazines, and IT vendors. Then, the paper presents the relationship between IT capability through IT success cases and corporate business performance among 32 industries.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.6-8
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• 2008

Electrical machineries have been developed as following with various and high technical application in these days. Especially the robot is integrated system including mechanical structure, electronic control, and electrical technology. The robot system is not compact and has not natural motion like human, although the technology of robot has been developing continuously. The spherical wheel motor is useful electric machine for using robot joint as operation of 3-degrees of freedom. In this paper, a permanent magnet spherical wheel motor is introduced and performance characteristics are analyzed for improving of operation stability.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1998년도 추계학술대회
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• pp.115-116
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• 1998

Pulse echo techniques have been used for the conventional medical ultrasound imaging systems. However, their resolution is limited in the transmitted signal power. To overcome this limit, pulse compression method used in the radar systems was proposed. This system transmits a continuous coded signal and then compresses the received signal into the short and high resolution pulse by using correlator. The reflectors can be detected by cross-correlation between the transmitted signal and the received signal with the depth information. In this paper, we will present a comparative study of the performances of the most common sequences(pseudo-chirp, m-sequences, modified Golay code). The best result for improving resolution is obtained with the modified Golay Code.

• 동력기계공학회지
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• 제13권3호
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• pp.53-58
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• 2009

The importance of cost reduction has grown bigger to ensure the competetive power of products in the electric home appliances industry. Thus, it is necessary to assess the reliability due to drop-impact happenning in process of distribution of microwave ovens with the panel and cavity of thinner thickness for cost reduction. In the present study, the drop/impact simulation using the explicit code LS-DYNA3D has been carried out for improving the impact resistance of a microwave oven. This CAE-based design approach can be successfully applied to enhance the deteriorated dynamic behavior under the impact conditions of dropping height 70cm according to ISTA procedure 2A.