• 한국정보통신학회논문지
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• 제19권5호
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• pp.1269-1276
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• 2015

전차의 임무 수행 능력은 생존성에 의해 크게 좌우된다. 생존성은 위협에 의한 피해를 예방하거나 피해를 입더라도 이를 감내하는 능력을 의미한다. 전차의 생존성 향상을 위해서는 피격에 의한 부품 손상으로 인한 영향 분석이 이루어져야 하며, 이를 토대로 설계 단계에서 부터의 성능 개선이 이루어져야 한다. 본 논문에서는 전차의 생존성 향상을 위하여 중요도 기반의 전차 생존성 분석 시스템을 개발하는 것에 관한 내용을 다룬다. 중요도는 전차를 구성하는 각 부품이 차지하는 비중을 수치화하여 나타낸 것을 의미하며, 이는 정량적인 전차 생존성 분석의 기초가 될 수 있다. 이를 위해 전차의 주요 부품별 가중치 부여를 통한 가중치 트리 구성 및 중요도 계산식을 적용하였으며, 이를 이용하여 전차의 생존성 분석 및 기능별 피해기준에 따른 분석을 수행하였다. 또한 이를 적용한 부품 구조화 및 가중치 설정 프로그램과 생존성 분석 및 시각화 프로그램을 개발하였으며, 전차 구성 부품을 3차원 CAD 모델을 이용하여 실험하는 것으로 개발한 시스템의 유용성을 검증하였다. 개발한 시스템은 전차를 구성하는 주요 부품의 공간 배치 등에 활용될 수 있을 것이다.

• 한국연초학회지
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• 제23권1호
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• pp.5-11
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• 2001

Experiments were conducted to evaluated the sucker control efficiency of several suckercides and their combinations for flue-cured tobacco in Korea. In 1999, Flumetralin(Prime+, P+), Butralin(B), Fatty alcohol(FA, n-decanol 85%), pottasium salt of maleic hydrazide(MH), tank mix of MH with P+ (MH·P+), and another tank mix of MH with FA(MH·FA) were applied after topping, respectively, then sucker number and sucker dry weight were investigated on the 30th and 50th day from treatment. Sucker number and dry weight were significantly lowered by P+, B, FA and MH·P+ applications compared with those of MH and MH·FA for both investigated periods. A significant reduction in sucker number and dry weight was observed in P+, B, and MH·P+ applications. FA treatment was not so much effective in sucker control as P+. In 1999 and 2000, several suckercides and tank mixes of their combinations were applied first at button stage and second after topping, respectively, to compare the effects of sucker control on yield, price index and chemical components of cured leaves. Compared to the standard method of FA 30x at button stage followed by MH40x application after topping(FA 30x + MH 40x), sucker number and dry weight decreased by [FA 30x (or P+ 1%] or [FA 30x(or B 1.5%) + MH 60x·B 1.5%] treatments, even at reduced MH levels. But yield, price index and chemical components of cured leaves were not differed among treatments.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1218-1231
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• 2008

Recently the energy dependence of LNG resource is being increased. So the enlargement of LNG storage is constructed in the coastal area. Most of LNG tanks are constructed below the ground level, and thus the hydraulic uplift pressure could be a problem against the weight of tank structure. Specifically, the settlement of foundation soil in the LNG tank is also important in the aspect of safety. The low temperature around LNG tank is induced the ground freezing and hence increasing the soil volume and earth pressure. The additional lateral earth pressure due to ground freezing could be applied to the LNG tank. In this study, the stability of LNG storage tank was evaluated with consideration of freezing earth pressure by using computer program TEMP-W.

• 드라이브 ㆍ 컨트롤
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• 제21권2호
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• pp.36-43
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• 2024

The yield is basic and necessary information in precision agriculture that reduces input resources and enhances productivity. Yield information is important because it can be used to set up farming plans and evaluate farming results. Yield monitoring systems are commercialized in the United States and Japan but not in Korea. Therefore, such a system must be developed. This study was conducted to develop a yield monitoring system that improved performance by correcting a previously developed flow sensor using a grain tank-weighing system. An impact-plated type flow sensor was installed in a grain tank where grains are placed, and grain tank-weighing sensors were installed under the grain tank to estimate the weight of the grain inside the tank. The grain flow rate and grain weight prediction models showed high correlations, with coefficient of determinations (R2) of 0.9979 and 0.9991, respectively. A main controller of the yield monitoring system that calculated the real-time yield using a sensor output value was also developed and installed in a combine harvester. Field tests of the combine harvester yield monitoring system were conducted in a rice paddy field. The developed yield monitoring system showed high accuracy with an error of 0.13%. Therefore, the newly developed yield monitoring system can be used to predict grain weight with high accuracy.

• 한국수소및신에너지학회논문집
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• 제10권3호
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• pp.151-157
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• 1999

The development of hydrogen vehicles has been actively progressed in the developed countries such as U. S., Japan and Germany. The most important technology of using hydrogen fuel is to develope a compatible storage tank with respect to the fossil fuel tank. Among many storage methods, the liquid hydrogen is the most desirable state because of the lowest volume and weight. The metal hydride tank is too heavy and the compressed hydrogen tank is too bulky. Because of these reasons, it is the principal purpose to analyze the theoretical heat transfer for designing and manufacturing an actual $LH_2$ tank. The insulation methods of the room between inner and outer vessel are non-vacuum, vacuum, vacuum with MLI(Multi-Layer Insulation). According to the results of the numerically calculated heat leak through the walls of the $LH_2$ tank, the vacuum insulated tank has 20 times and the MLI tank has 5616 times less heat leak than the non-vacuum tank.

• Composites Research
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• 제36권2호
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• pp.132-139
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• 2023

추진제 탱크의 경량화를 위해 비강도가 우수한 탄소섬유 강화 복합재를 이용하여 라이너 없이 복합재 추진제 탱크를 제작하기 위한 연구를 수행하였다. 본 연구에서는 MEOP 1.7 MPa의 내압을 지탱할 수 있는 직경 800 mm의 복합재 추진제 탱크 축소형 시제를 설계하였고, 보스 또한 동일한 복합소재로 제작하여 무게를 줄였다. 라이너 없이 탱크를 제작하기 위해 분리형 맨드릴을 이용하였고, 맨드릴의 무게도 줄이고 경화 과정에서 맨드릴의 팽창을 줄여 치수안정성을 도모하기 위해 복합재로 맨드릴을 제작하였다. 맨드릴 상에 탄소섬유 직물 소재를 핸드레이업 공정으로 적층한 후 오토클레이브 경화 과정을 거쳐 시제품을 제작하였다. 시제품 제작 후, 상온 보증압 시험과 헬륨 기밀 시험, 그리고 상온 반복 내압 시험과 파열 시험을 수행하여 내압 강도 및 기밀 성능 요건을 충분히 만족함을 확인하였고 파열압에 대한 안전여유가 충분함을 확인하였다. 본 연구 결과를 발사체 연료탱크 개발에 적용함으로써 발사체 전체 경량화에 기여할 수 있고, 향후 극저온 성능까지 검증한다면 극저온 산화제탱크 제작에도 활용할 수 있을 것으로 기대된다.

• 수산해양기술연구
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• 제44권2호
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• pp.148-156
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• 2008

In this study it will be discussed how to solve the problem of discomfort from rolling motion on the fishing boats. Most discomfort is caused by the short cycle of rolling due to the light weight of the boats. The light weight is due to the FRP material which dries a boat. A way to improve the feeling of boarding by using fish hold was researched. The experiment was done on experimental fishing boat made by FRP in Jeju. An existing fish hold was designed and manufactured through the rolling test and that was used for a marine experiment. The rolling condition of the U-tank boat ideally designed was compared to that of an existing fishing boat using the same conditions. The experiments were carried out two times on the stop engine in the outward Sehwa fishing port, which the experimental data had analysed for effects of rolling reduction to compare the U - tank with the of exiting fish hold. The results were confirmed that the U-boat tank in the roll period and GoM were more safe than the existing fish hold and the average amplitude and significant of rolling angles were decreased relatively.

• 한국가스학회지
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• 제11권4호
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• pp.85-90
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• 2007

본 논문에서는 유한요소법을 사용하여 댐핑안전 구조물을 설치한 완전밀폐식 LNG 저장탱크 시스템의 강도안전성에 대해 해석하였다. 내부탱크의 FEM 해석을 위해, 탱크에 저장된 LNG에 의한 유체정압, 초저온 온도하중, BOG 압력, LNG 자중량, 내부탱크의 코너 측벽면에 가해진 침하하중 등과 같은 모든 복합하중을 내부탱크 구조물에 적용하였다. FEM 계산결과에 의하면 기존의 내부탱크는 주어진 모든 하중 조건에 대하여 안전하지만, 압축 스프링과 같은 댐핑안전 구조물은 탱크시스템의 안전성을 확보하는데 대단히 유용한 구조물일 것이라는 사실이다. 따라서 스프링의 강점도를 높이고 최적의 설치위치를 찾으면 스프링 구조물에 의해 탱크시스템의 댐핑강도 안전성을 증가시킬 수 있는 중요한 설계요소가 될 것이다.

• Journal of Advanced Marine Engineering and Technology
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• 제32권1호
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• pp.131-136
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• 2008

The double-walled steel vessel with powder insulation in the space between the walls is used to minimize heat transfer by radiation and conduction in cryogenic storage tank. The vacuum required the insulation is much less extreme than with high-vacuum or multilayer insulations. The solid supports are used to bear the weight of the inner container. Thermal and structural analysis of the tank have been carried out to study the effect of vacuum and weldment geometry of the internal supports. Heat flux in wall is increased with increasing of thermal conductivity of perlite. Heat flux and stress of support is not affected by weldment geometry.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2317-2319
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• 1999

765kV Transformer, bank capacity is 2,000MVA, is developed of two seperated tanks per phase because transportation weight of the transformer needs to be reduced. So we will operate one tank per phase in some case, low load or black down of 1 tank, using the one phase-two tank type of 765kV transformer to cut down the cost and improve the reliability of substation.