• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.210-214
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• 2000

컴퓨터를 이용한 교육 시스템은 1950년대말 일리노리 대학의 Donald Bitzer 박사에 의해 구상되어 왔고 1961년 PLATO 시스템이 개발된 이래 지난 30여년 동안 다각적인 연구가 이루어져왔고, 특히, 인터넷과 정보통신기술의 발달은 WWW 기반의 원격교육시스템의 개발과 발전을 진일보 시켰으며, 이들 시스템들은 기존의 교육 패러다임을 변모시키는 새로운 형태의 교육체계 구현을 통해 교육현장에 커다란 기여를 하고 있다. 본 논문은 WW W기반 기술 중 능동적 정보전달방식인 Push 기술을 기존 원격교육 시스템에 접목하여 학습자가 인터넷의 학습 DB에 접속하지 않고도 학습 내용을 제공받을수 있고, 새로운 학습정보를 실시간적으로 파악할 수 있는 Push 기반 원격교육시스템을 제안한다. 또한 , 학습지의 다양한 수준에 맞는 문제의 처리와 문항 분석이 가능한 수준별 문항평가 알고리즘을 통해 학습자의 학습수준에 적합한 문항 평가 이루어지도록 설계하였다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.36 no.1
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• pp.9-15
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• 2018

Precise regional geoid heights on and around Mount Jiri were calculated and were compared to the KNGeoid14 (Korean National Geoid 2014) model. In this study, gravimetric geoid heights were calculated by using RCR (Remove-Compute-Restore) technique and then hybrid geoid heights were calculated by using the LSC (Least Square Collocation) method in the same area. In addition, gravity observation and GNSS(Global Navigation Satellite System) surveying performed in this study were utilized to determine gravimetric geoid heights and to compute hybrid geoid heights, respectively. The results of the study show that the post-fit error (mean and standard deviation) of hybrid geoid heights was evaluated as $0.057{\pm}0.020m$, while the mean and standard deviation of the differences were -0.078 and 0.085 m, respectively for KNGeoid14. Therefore, hybrid geoid heights in this study show more considerable progress than KNGeoid14.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.786-788
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• 2005

전력 부하관리기기인 축냉시스템은 그동안 건물 냉방 공조용을 중심으로 보급되었다. 기저부하를 증진시키고 주간의 피크부하를 낮추어 주야간의 부하불균형을 해소하는 축냉시스템은 그동안 전력부하율 향상 및 부하평준화에 많이 기여해왔다. 산업용으로의 축냉기기보급의 타당성 및 부하평준화에 관한 연구시행 결과, 그 타당성과 보급확대의 필요성이 확인 되었다. 가스식 냉방기는 피크억제측면에서, 축냉식은 부하이전 측면에서 장점이 매우 크며, 전체 부하관리 측면에서 이들의 균형보급발전 노력이 필요하다. 산업용으로의 축냉기기 보급은 특히 주야간 부하불균형이 심한 하계의 부하평준화효과가 크며, 그 보급시장 및 전력절감 잠재량 규모를 감안할 때 국가적 편익과 추가 발전설비건설억제에 크게 기여할 것으로 예상된다.

• Textile Coloration and Finishing
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• v.20 no.1
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• pp.22-27
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• 2008

Sulfadiazine and silver sulfadiazine are well-known bactericidal agent routinely used clinical settings. Antimicrobial acid dyes were synthesized by introducing sulfadiazine or silver sulfadiazine and applied on nylon fabric. The Chemical Structure of the Synthesized dyes was identified by HPLC-mass. The dyeability of synthesized acid dyes for nylon fabric was similar to commercial acid dyes. Resistance to washing, rubbing and lightfastness were good. Nylon fabrics dyed with synthesized acid dyes had good antimicrobial properties. Durable antimicrobial properties after 20 times washing have shown good result that reduction ratio of colonies, is 99.9 %. Mixed dyeing were carried out using commercial acid dyes(leveling type) and synthesized dyes. The mixed dyeings have also shown good antimicrobial properties.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.51
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• pp.231-240
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• 1999

A major concern in Concurrent Engineering is the control and management of workload in a period of process. As a general rule, leveling the peak of workload in certain period is difficult because concurrent processing is comprised of various processes, including overlapping, paralleling looping and so on. Therefore, the workload management with resource constraints is so beneficial that effective methods to analyze design process are momentous. This study presents the Timed Petri Nets approach of precedence logic networks, and provides an alternative for users to analyze constraint processes to resolve conflicts of resources. Another approach to Continuous Time Markov Chain using Stochastic Petri Nets is also proposed. These approaches are expected to facilitate resolving resource constrained scheduling problems more systematically in Concurrent Engineering environment.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.10a
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• pp.379-382
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• 2008

This paper gives the support method of DSM program(power load leveling for heating and cooling facilities on building). As the national power peak load increases recently, the peak load reduction is needed. So we studied about remote controlling of power load from heating/cooling facilities on building during peak times. To adopt new DSM program, it is very important to design DSM customer supporting system. So in this paper, we dealt with the result of customer survey, and the DSM potential regarding heating/cooling facilities on building. In conclusion, the peak reduction program of heating/cooling facilities is very important and the incentive of customer should be consist of two incentive types as an installation and power reduction.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.1091-1093
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• 1998

The BESS has a major advantages such as load leveling, quick response emergency power (spinning reserve), frequency and voltage control, improvement of reliability, and deferred generation and transmission capacity construction. However, the economic feasibility of these systems requires justification from the customer side of meter. In this paper, we proposed the economic evaluation model of BESS which is modified and complemented the SYSPLAN model[2]. In addition, we analyzed a economic evaluation from the economic measures such as payback period, overall benefit, ROI, and ROR.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.05a
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• pp.123-124
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• 2015

The project participants make use of floats for their benefits. The owner may consume floats in an event of issuing change order(s) and may avoid the risk factors attributed by them; the contractor may reduce activities' costs by substituting the activity with alternative construction method and by leveling the resources, hence consuming floats. There are a lot of disputes and claims involved in the float ownership issue. The ownership of floats should be stipulated in the contract stage. To alleviate these disputes and claims, it is commendable to develop a computational method that quantifies the float value. This paper presents the method that computes the values of total floats which changes over the project life span. The system calculates CPM, compute the ratio of area of banana curve which is enclosed by earliest start curve and latest start-curve.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.11a
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• pp.671-674
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• 2004

In this study a program 'SAPONC-FRANCE' which is able to evaluate and analysis the elastic behavior property of the domestic FRANCE type containment under pressurization and depressurization in periodic structural integrity test (SIT) was developed. The readings of EAU system that is composed of the pendulum, invar-wire, leveling-pot, bench-mark, thermocouples and acoustic strain gauges were used as input data for operating the program. This program provides the prediction lines and bands of the pressure-strain(or displacement) relationship of concrete due to the changing of inner volume under pressurization and depressurization in SIT of the domestic FRANCE type containment.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.580-582
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• 2004

이동 기기의 저장 장치로 널리 사용되는 플래시 메모리는 데이터를 기록하기 전에 해당 블록이 미리 소거되어 있어야 하는 제약이 있다. 또한 각 블록은 소거 횟수의 한계를 가지고 있기 때문에 특정 블록이 집중적으로 사용되는 경우에는 일부 블록의 수명이 일찍 다하게 되어 저장 장치로서의 구명도 짧아지게 된다. 따라서 플래시 메모리 파일 시스템은 고속의 데이터 입출력 성능뿐만 아니라 기록과 소거 동작이 특정 블록에 집중되지 않도록 하여 저장 장치의 내구성을 개선하는 소거 횟수 평준화 기능을 제공해야 한다. 기존에 제안된 소거 횟수 평준화 기법은 복잡한 계산을 필요로 하며 각 블록의 소거 횟수를 유지해야 하는 비용 등으로 인해 자원이 부족한 소형 이동 기기에서 구현하기에는 비효율적이다. 본 논문에서는 플래시 메모리 파일 시스템에서 구현과 동작이 단순하고 어떠한 데이터 접근 형태에 대해서도 평준화 성능이 우수한 효율적인 소거 횟수 평준화 기법을 제안한다. 그리고 제안된 기법을 구현하여 기존 플래시 메모리 파일 시스템의 소거 횟수 평준화 성능과 비교 평가한다.