• 생물환경조절학회지
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• 제5권2호
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• pp.160-166
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• 1996

김등과 Kim등이 재발한 공정묘 생산용 풍동을 사용하여, 인공광하의 묘개체군내외에서 기온, 상대습도 및 포차(vapour pressure deficit) 등의 미기상 특성에 미치는 기류속도의 효과를 분석하였다. 기온차의 최고치가 초장 근처에서 나타났으며, 이러한 결과는 공정묘의 생육이 진행될수록 더욱 분명하게 나타났다. 묘개체군 내부에서는 배지 또는 엽으로부터의 증발산으로 인하여 개체군 외부에서의 기온에 비해서 0.7-l.4$^{\circ}C$ 정도 낮게 나타났는데, 기류속도가 낮을수록 기온차가 높게 나타났다. 묘개체군 내부의 상대습도 분포에 미치는 기류속도의 영향이 매우 큰 것으로 나타났다. 기류속도가 증가할수록 묘개체군 내외에서의 상대습도차는 작게 나타났는데, 이것은 기류속도의 증가에 따라 엽에서의 water potential이 감소되었기 때문인 것으로 판단된다. 배지표면으로부터의 높이가 증가함에 따라 포차가 증가하였다. 이와 같은 결과는 수증기 유속의 흐름이 상방향으로 이루어짐을 의미하는 것이다. 생육단계에 따른 포차의 변화는 엽면적 지수가 클수록 수직방향으로의 기울기가 크게 나타났다. 한편, 후부에서의 상대습도 및 포차는 중앙부에서 보다 약간 낮게 나타났다. 기류속도에 따라 묘개체군의 수직방향 및 기류진행방향으로 기온, 상대습도 및 포차의 기울기가 크게 나타났는데, 이러한 미기상 요소의 기울기는 묘개체군의 불균일 생장을 초래할 수 있다.

• 한국작물학회지
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• 제44권3호
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• pp.201-206
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• 1999

For the mass production of plug seedlings in cultivar ‘Dejima’ potato (Solanum tuberosum L.) the optimal apical cutting diameter for rooting and rapid multiplication of stem cuttings in hydroponics were determined. In addition, the best planting date was predicted to increase tuber yield of plug seedlings at fall cropping in Cheju-Do, Korea. Days to initial rooting decreased as the cutting diameter was reduced. Plant height, leaf number, root length and root weight per plant were favorable as the cutting diameter was small. The ideal cutting diameter was 1-2 mm in this experiment. In the hydroponic cultures, the Japanese standard (JS) nutrient solution was the most effective for multiplication of stem cuttings. It was able to propagate more than 20 times a month from a single mother plant. Viability of plants, which were derived from plug seedlings using stem cuttings, was excellent when transplanted to the field. The number of tubers and tuber yield in both of the plug seedlings and seed potato planting plots were high when planted on 25 August. The number and yield were reduced when planted on 15 August, 5 September and 15 September. The degree of decrease of tuber yield in the plug seedling planting plot however, was lower than that of seed potatoes when the planting date was late. In the case of small tubers (under 30 g), the number of tubers and tuber yield were evidently increased in the seed potato tuber planting plot; the yield of large tuber (over 80g) in the plug seedling planting plot was higher than that of the seed potato. The total tuber yield per plant in the plug seedling planting plot was less than that of the seed potato; therefore, in order to increase tuber yield it was necessary to increase field plant density.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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• pp.210-213
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• 2005

This article describes an estimate method of the spark plug gap by measuring breakdown voltage. Breakdown voltage is the function of spark plug gap, pressure, temperature and humidify. However. It is dominated mainly by the spark plug gap. This technique is applied to in-line process test of the spark plug gap in automobile engine production. Breakdown voltage of normal spark plugs slightly scatters in ordinary conditions and if there is dust or burr in the gap, breakdown voltage gets lower. This technique saves repairing time for bad spark plug and attributes to improve the quality of automobile engine.

• 한국연초학회지
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• 제24권1호
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• pp.60-66
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• 2002

The ventilation rate of a ventilated filter cigarette depends on the details of its construction and on the properties of its components such as tobacco column pressure drop, filter pressure drop, tipping paper and plug wrap permeability, and vent position. Also, It was affected by the condition of adhesion of glue between tipping paper and plug wrap. This study was carried out to find the effect of surface properties of tipping paper and plug wrap, and a characteristics of glue on the ventilation rate of cigarettes. Our results indicated that the surface properties of tipping paper and plug wrap affected on the ventilation rate of cigarette. Also, the variation of ventilation rate was affected by the surface properties of tipping paper and the size of glue particles. We also found that the surface properties of tipping paper and plug wrap, and the emersion size of glue were the major factors to concern in the design for materials of cigarettes.

• 열처리공학회지
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• 제30권5호
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• pp.207-214
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• 2017

In this study, failure behavior of piercing plug for seamless tube manufacturing process was studied. Three different kinds of passed piercing plugs (10, 90, 215 times) were prepared. The shape deformation of the passed piercing plugs was observed by 3D coordinate measuring machine, and the oxidized layer on the surface of piercing plug was observed by optical microscopy. The length reduction of piercing plug presented at 215 times passed plug. It was found that the oxidized layer consisted of outer scale, inner scale and internal oxidation layers, and the inner scale layer had vertical cracks, and interfaces had horizontal cracks. We proposed the failure mechanism of piercing plug during seamless tube manufacturing process based on the formation of vertical and horizontal crack.

• Journal of Welding and Joining
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• 제16권1호
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• pp.106-113
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• 1998

In this study, the plug weldability of STS 304 was investigated. The parameters which influence plug weldability were pushing pressure of the plates, position of welding wire and composition of shielding gases. Among these factors, the composition of shielding gases and hole diameter of the upper plate were found to be the major factors influencing weld quality. To evaluate weldability, tensile shear strength of the plug welded specimen was measured and compared with tensile strength of butt welded specimen. Hardness was measured for both plug weld and butt weld. The microstructure of the weld metal and HAZ were also characterized.

• 한국유기농업학회지
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• 제8권1호
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• pp.89-99
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• 1999

To do mass multiplication of plug seedlings in potatoes, apical stem cuttings originated from virus-free microtubers were cut to one-two internodes and transplanted into the plug-tray. After 10days, we applied Chitosan and Wood Extraction on rooting and tuber formation of plug seedlings. To improve field adaptability of plug seedlings, rooted cuttings with a height of 20cm after 20days of cutting were transplanted ito the fields, We applied 500~2000ppm Chitosan on growth characteristics and tuber formation of that. The above and underground growths, such as plant height and number of leaves were significantly more vigorous after treatment with 500~1,000ppm Chitosan and 2,000ppm Wood Extraction, the spray treatment was carried out five times at intervals of four days after ten days of transplanting. T-N, K, P, Mg and Na, were higher as the concentrations of chitosan and Wood Extraction were higher. The growth and tuber yield in plug seedlings planting plot and seed potatoes planting plot were effectively highter as foliar application of Chitosan(500~2,000ppm) was done after planting the plot. T-N content in leaves and tuber was higher as the concentration of Chitosan was high. A similar tendency was shown in K, P and Mg. In the small tuber(under 30g), the number of tubers and tuber yield were relatively increased in the seed potatoes planting plot, but the large tubers(over 80g) yield was higher in the plug seedlings planting plot, and in order to increase tuber yield in plug seedlings it was necessary to add plant density to the field.

• 한국정보전자통신기술학회논문지
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• 제1권1호
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• pp.13-19
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• 2008

본 연구를 통해 Maya SDK와 API, MEL 기술을 이용하여 Backup save가 가능한 plug-in 개발과 Maya 프로그램 안에 구현해 보고 각종 응용 프로그램 활용 가능성을 고찰하고자한다. 현재 활용되어지고 있는 Maya의 다양한 plug-in들 중에서 개발자들의 고충이라 여겨지는 파일관리와 저장시의 보관의 어려움에 대해 분석하여 Backup save이 가능한 다양한 방법을 파악하고, Backup save plug-in을 통해 중복파일와 기존파일의 불의의 수정을 미연에 방지해 개발자의 능률을 높이고자하는데 목적을 두고 그래픽 개발자 측면에서 백업저장이 Maya 프로그램 활용능력과 데이터 유지 보수를 향상시킬 수 있는 가능성을 고찰 하였다. Maya 소프트웨어에서 백업저장 기능으로 구현된 plug-in 기반 솔루션은 다양한 응용 소프트웨어에서도 응용될 수 있다고 판단된다.

• 한국지반공학회지:지반
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• 제9권4호
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• pp.7-16
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• 1993

지반조건이 관내토의 지지력특성에 미치는 영향을 알아보기 위하여 여러가지 조건을 갖는 모래지반에 타입된 개단말뚝에 대하여 토조실험을 수행하였다. 실험에서 사용된 모형말뚝은 말뚝의 지지력을 외주면마찰력과 관내토지지력, 그리고 말뚝 단면부지지력의 세가지로 분리 측정할 수 있도록 제작하였다. 몇가지 가정하에 실험결과로부터 계산된 관내토 내부의 토압계수는 말뚝의 관입깊이와 지반의 상대밀도가 증가함에 따라 감소하고, 지반의 초기 압밀압력이 증가할수록 증가하는 경향을 나타낸다. 또한 토압계수는 관내토의 하단부에 접근할수록 증가한다. 관내토의 1차원 해석으로부터 계산된 관내토지지력과 실측치의 비교로부터 Randolph등과 O'Neill등에 의하여 제안된 P를 이용한 1차원 해석이나 API의 추천방법은 관내토지지력을 상당히 과소평가 함을 알 수 있다. 따라서 실험결과에 근거하여 관내토의 1차원 해석을 통한 관내토지지력의 예측 정도를 높이기 위하여 1차원 해석에 필요한 관내토의 토압계수를 산정할 수 있는 경험식이 제안되었으며, 제안된 식은 모든 지반조건에 대하여 적당한 관내토지지력을 산정한다.

• 조명전기설비학회논문지
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• 제25권4호
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• pp.104-110
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• 2011

There are over 30[%] of electric fires in Korea happened at wire or wiring devices. For its prevention many safety devices are set up electric equipments. These safety devices are not working in a rated current's condition of electric equipment. But when wire is partially disconnected, electric fire is able to be happened even though current is smaller than a rated current value. This paper studied thermal characteristics and fire ability when wire in plug is partially disconnected. The experiment is progressed a method that inner wire of plug is partially disconnected and after that current that is less than a rated current is flowed. As the result, heating occurred in near of partially disconnected wire makes that outer sheath is melted, plug cover is carbonized, and even sometimes wire is fused. And results of analysis of thermal image of partially disconnected wire happened in plug, it shows a difference to heating distribution and temperature appeared surface of plug depend on a progress of a partially disconnected wire.