• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 추계학술발표회 논문집
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• pp.3-7
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• 2004

Many countries have changed her geodetic reference system from local system to global system because of the global network's necessity. And, also Korean geodetic reference system changed from Tokyo datum to Global geodetic reference system since 2003 as the revision of Survey Law and Korean reference ellipsoid changed from Bessel 1841 ellipsoid to GRS80. The purpose of this paper is evaluation of ellipsoid agreement before and after change due to the introduction of global geodetic reference system in Korea. For the evaluation ellipsoid agreement was analyzed using two Korean geoid model -KOGD2003 and KOBGDM33- on both ellipsoid and area variation caused by change of reference ellipsoid was calculated.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2009년도 춘계학술발표회 논문집
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• pp.49-53
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• 2009

본 연구에서는 현재 활발한 연구가 진행되고 있는 고정밀 지오이드 모델 개발에 있어서 중요한 요소 중 하나인 지상중력자료를 획득하기 위해 상대중력계를 이용하여 중력을 측정 하였다. 1등 수준노선 총 58점의 수준점에 대하여 상대중력측량을 실시하였고 이렇게 얻어진 중력값으로부터 지구조석보정 및 기계고 보정 후 자유망조정 방법을 이용하여 중력성과를 계산하였다. 이와 같은 방법을 통해 얻어지는 지상중력자료들은 고정밀 지오이드 모델 개발에 큰 기여를 할 것으로 판단된다.

• 한국시스템다이내믹스연구
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• 제16권3호
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• pp.31-48
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• 2015

The purpose of this paper is to simulate drinking population, an alcoholic abuser and an alcoholic through therapy programs and system dynamic model. Then we try to research relationship between an alcoholic crime and related therapy programs. The results of the model simulation were consistently increased drinking population and 3 types drinkers until 2020 years. Specially the growth rate of drinking abusers will be passing that of a drinking population. Second, It showed clearly the decreasing effects of drinking crime on therapy programs(clinical treatment, preventive displine and counseling treatment). Finally, it will be positvely necessary the long-term and various alcoholic therapy program for reducing the ratio of drinking abusers and an alcoholic. In the second place, government and medical centers must be established a concrete information systems for collecting alcoholic datum.

• 한국측량학회지
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• 제12권1호
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• pp.15-24
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• 1994

우리 나라의 독자적인 원점체계에 의한 정밀 측지망성과의 확립을 위하여 1975년에 착수된 정밀 1차 측지망 사업은 1993년에 제1회 관측이 완료되었으며 1994년에는 일부지역에 대한 보충관측이 진행되고 있다. 본 연구에서는 측지망 측량성과의 정확도 및 측지망 강도를 평가하고자 작업구역별, 블럭별 조정계산을 실시하였다. 조정 및 분석결과, 작업규정 전반에 대한 수정, 보완을 위한 체계적인 연구가 필요하며, 정밀측지망의 실용성과 산정에 필수적인 기초자료가 확보되었다.

• 한국측량학회지
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• 제12권1호
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• pp.69-76
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• 1994

본 연구는 측지원점의 지오이드 기준설정에 따른 WGS84 타원체와 Bessel 타원체간의 좌표변환특성을 파악하기 위해, 충남·북 지역내 11개 기준점의 GPS 관측자료를 토대로 원점의 Bessel 타원체면에 기준한 지오이드 고를 다양하게 가정하여 각 경우별로 타원체간의 평균지심편차량을 도출, 지역내 Bessel 지오이드를 모델링하고 이에 연계한 좌표변환을 수행하므로써 Bessel 지오이드 고의 변동에 따른 좌표변환정확도를 고찰한 것이다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.952-960
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• 2009

Foundation soils are greatly influenced on the stability of structures. The soft clay deposited in Incheon Port area is named either nomally consolidated clay or unconsolidated clay. New harbor structures will be constructed in Incheon Port area. Not sufficient soil boring datum are obtained from the filed soil exploration due to limited time and cost. The harbor construct site is pretty large area and the soils are not homogenous. This paper presented the result of reliability analysis which was performed by both Bayesian approach and analysis of variance.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.377-379
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• 2001

Contamination flashover is responsible for insulator electrical failures. Particularly, in Korea, with its perennially dry spring, the first spring rain often cause serious line outages by forming a conductive liquid film on the insulator surface. Rainwater and fog are not normally conductive but unfortunately atmospheric dust deposited on the insulator surface contains soluble salts which may lead to bad condition of insulation by combining watery and salts. Transmission design engineers have used a contamination map drawn on the traditional paper map. But it is not convenient because it does not include the information of Geographic Information accurately. This paper explains the newly developed salt contamination map program using Geographic Information System, which provide accurate geographic information. The program is designed to use four parts of datum, salt contamination levels, 345kV & 154 kV transmission lines, power plants & substations and background map. The digital background map is composed of raster files, the others are done by vector map.

• 설비공학논문집
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• 제1권1호
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• pp.1-8
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• 1989

This paper treats the temperature effectiveness of the two-fluid counterflow regenerator in a rotary type. To avoid continual interpolation and to obtain the simple result in calculating that, it obtained the particular solution for the direct-transfer-type counterflow heat exchanger by the graphical procedures. Also, it introduced the empirical formula for the influence of the ratio of rotor matrix to minimum working fluid heat capacity rate with the particular solution induced. Particularly, substituting the published results of temperature effectiveness into the program, it obtained the simple and convenient equation which can applicate in the counterflow regenerator in a rotary type. To compare and discuss the results induced, selecting the regenerative air preheater and applying the their running datum and specifications to the related results, it shows that the above results are agree with the published results within absolute relative error, 3.0%.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1350-1358
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• 2008

Recently the study related to life cycle cost analysis of railway structure consisted of a complex is proceeded covering several range, which is considering the methodology of efficiency and rationalization for maintenance and analysing long-time behavior of the structure of looking at standpoint from asset management and safety. But LCCA(life cycle cost analysis) of railway structure was almost impossible as there were not anything datum for maintenance plan, such as maintenance periods related to each of components(painting and corrosion of steel, and cracking of elements, etc)and maintenance proportion, despite of its 100-year history. According, for collecting data related to railway truss bridge, bridge record cards and testing safety papers, and researching question, etc are surveyed and classified for LCC Analysis. Especially, LCC assessment on the side of assets-maintenance considering about initial cost, maintenance cost, and indirect cost is constructed. Maintenance period and complementary measure rate are very important in maintenance. To decide maintenance period, Baysian updating method is applied.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.253-257
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• 2002

So far. the common elasticity data of textile fabrics has not been present because the method depends on the knowledge of measurement operators. In this paper, the new measurement equipment using road cel1 is presented to measure the coefficient of textile fabrics in real time. The measurement method is based on the volta among textile fabrics. The textiles with strong elasticity are high voltage produced from others are low. The presented method can be applied to visualize the textile, sew the cloth, control textile fabrics. Also. these measurement datum are used to B2B electronic trading system.