• 대한안전경영과학회지
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• 제17권4호
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• pp.373-379
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• 2015

Supply units in each command are multi-tiered and each supply unit keeps a supply level independently, which can cause excess stock, leading false reports to the Logistics Command and increasing difficulties in managing user needs. This causes excess assets and the excess then causes deformation in demand. therefore, the supply support systems of our armed forces have become high-cost/low-efficiency and are insufficient to meet the needs of users in combat units. Civilian corporations and the US Department of Defense are downsizing the aforementioned multi-tiered supply systems thus revolutionizing efficient and effective logistics by adopting Supply Chain Management(SCM), and Prime Vendor policies. Prime Vendor policy is a logistics support method that allows users to directly request and receive supply items from suppliers, based on supply contracts between suppliers and central maintenance organizations like KDA. In other words, it is a system that allows for users to make orders to suppliers directly and suppliers to deliver goods to the users directly, cutting out the middle stage, thus allowing an efficient supply. This is a way forward in finance that cuts costs in net supplies and allows an efficient utilization of civilian assets. which is also known to fasten the speed of logistical support and stripping down the logistical structure. therefore, this report will explore Prime Vendor policies adopted in certain number of units for medical supplies that were taken in consideration of improvements in stock management in civilian organizations and the US Army, and aims to apply such policies for repair parts.

• 한국기계가공학회지
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• 제13권1호
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• pp.1-7
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• 2014

An impeller is difficult to machine due to the complex, overlapping and twisted shapes that form the blades of an impeller. Therefore, most CAM software companies have developed a CAM module for manufacturing an impeller in addition to their CAM software. However, it is not easy for inexperienced users to machine impellers. The purpose of this paper is to outline the development of an automatic CAM module for the manufacturing of an impeller (E-ICAM) which is based on visual basic language and which uses a CATIA graphical environment in order to simplify the machining of impellers. The automatic CAM module generates a tool path and proposes the recommended cutting condition according to the stock and tool material. In addition, it includes a post-processor for five-axis control machining. Therefore, a user can easily machine impellers using this automation module. There are two types of impellers: the closed and open types. The closed-type impeller consists of the body and cover parts. To combine these two parts, it is necessary to create tap holes on the shroud of the body. Therefore, in the study, a drilling CAM program for a closed-type impeller is developed and manufactured by creating NC data from the developed drilling program. After manufacturing the test specimen, its compatibility was verified.

• 한국잠사곤충학회지
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• 제22권1호
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• pp.52-58
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• 1980

20년생 낮추베기 개양서반의 뽕밭에서 휴간 1.8m을 7등분으로, 2주간 1.2m를 7등분으로 각각 분할하고, 표토로부터 10cm씩 40cm 깊이의 토양을 구분 채취하여 총 196점에 대한 뿌리와 토양화학성분포를 조사 분석한바 그 결과는 다음과 같다. 1. 뿌리의 분포는 그루주변으로 갈수록 증가하늘 반면 pH 유효인산, Ca, Mg등은 이와 대조적으로 휴간에서 높았다. 2. 주간의 뿌리 및 토양화학성(pH, 유효인산, K, Ca, Mg등)은 비교적 균일한 분포를 보였다. 3. 층위별 뿌리의 분포는 10~20cm부위에서 가장 높은데 비해 0~10cm부에서는 20~30, 30~40에서 보다도 낮으며 pH, 유효인산, Ca, Mg, K등은 0~10cm부위에서 가장 높으며 심층으로 갈수록 낮아서, 사실상 양분의 효율적인 흡수가 극대점에 이르지 못한 것으로 판단되었다.

• 한국산림과학회지
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• 제20권1호
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• pp.45-50
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• 1973

싸리류(類)에 대(對)한 선발된 우량개체 및 앞으로 육성(育成)될 신품종(新品種)에 대(對)하여 무성번식의 방법을 구명(究明)코져 조록싸리, 참싸리, 늦싸리, 싸리, 털근록싸리, 풀싸리를 공시재료로 하여 4월(月) 상순(上旬) 삽목직전 1년지(年枝)를 채취하여 삽수길이 15~20cm, 삽수굵기 3~4mm, 삽수상하단을 동일하게 타원형으로 조제하여 1,000배액의 "우수프론"으로 소독한 삽상길이 150cm의 모래상에 삽목하였으며 삽목후 해가림 관수를 하였다. 그 결과 교배에 의한 신품종 및 선발개체(選拔個體)에 대(對)한 무성번식이 가능함을 인정할 수 있었으며 아래와 같은 결과를 얻었다. 1. 싸리류(類)의 삽목발근율은 50.3~69% 로 품종간 차이를 인정할 수 있었으며 털조록싸리, 조록싸리의 발근율이 제일 높고 풀싸리가 제일 낮았다(유의 수준 1%). 2. 생육상황(生育狀況)은 조록싸리, 싸리가 좋았으며 풀싸리가 가장 불량했다. 3. 본당(本當) 뿌리수는 길이 5cm 이상만을 측정하였으며 털조록싸리가 6.4개로 제일 많고 풀싸리가 1.3개로 제일 적었다(유의수준 1%). 4. 본당(本當) 뿌리의 총연장은 털조록싸리 279.8cm, 조록싸리 200.1cm로 가장 길고 풀싸리는 41.1cm로 가장 짧았다(유의 수준 1%). 5. 본당(本當) 근류착생수는 직경 1mm 이상만을 조사하였으며 털조록싸리 34.4개, 조록싸리 27.1개로 제일 많고 풀싸리는 4.6개로 제일 적었다.

• Fisheries and Aquatic Sciences
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• 제9권2호
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• pp.75-82
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• 2006

We evaluated the utility of applying isozyme analysis and two tagging methods, visible implant fluorescent elastomer (VIE) injection and uropod-cutting, to monitor the effects of releasing nursery-reared fleshy prawn (Fenneropenaeus chinensis) into natural habitat in Korea. One hundred thousand farmed prawns (70 mm long) were tagged by clipping off the outer left uropod and injecting them with VIE. This marked seed population was released at Muchangpo, Korea, on 11 and 19 July 2002. Two months later, total catch and catch per unit effort (CPUE) at three locations (Hongwon, Muchangpo, and Anmyundo) were determined. Total catch and CPUE increased nearly 18% over the previous year in Hongwon and Muchangpo. The mixing rate, estimated by uropod regeneration pattern, was 0.33% at Hongwon, 0.53% at Muchangpo, and 0.21% at Anmyundo. The recapture rate was about 3.5%. Isozyme analysis confirmed that the mixing rate was highest at Muchangpo. Moreover, fleshy prawns from Muchangpo were genetically most related to the seed population, indicating that the released prawns had largely remained near the released site. We also confirmed that isozyme genes are valuable as genetic markers for qualitative analyses of a released seed population.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.326-330
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• 2005

Crahworthy design of trains is now indispensable procedure in modern railway vehicle design for ensuring the safety of passengers and crew. It is now widely recognized that a more strategic approach is needed in order to absorb higher level energy in a controlled manner and minimize passenger injuries effectively. The first design step in this strategic approach is the design of the front end structure(so called HE extremities) to absorb a large part of total impact energy and then the structure of passengers non-accommodation zones(so called HE extremities) is designed to absorb the rest of impact energy. In this paper, the passengers entrance door area is selected as the LE(low energy) extremities and the design of the LEE was carried out. The main part of LEE design procedures is the design of energy absorbing tubes. For this purpose, the several tube candidates are introduced and compared to each others with numerical crash simulation.

• Journal of the Korean Wood Science and Technology
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• 제2권1호
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• pp.3-18
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• 1974

The exports of plywood are increasing annually and it has ranked first in the world market because of the high quality product and manufactured using mordern techniques. However, it is known that the exports of the other wood products, except plywood, is inactive because of their low quality. Accordingly, to increase the exports of various wood products investigations were carried out on kiln drying techniques to improve the quality of the wood. Wet wood should be kiln dried before use to prevent various drying defects such as distortion, shrinkage etc., which would develop after processing,:and also wet wood is not suitable for cutting, gluing and finishing. Therefore, the kiln drying properties of lumber from such species as oak, ramin and meranti which are used in large quantity for manufacturing exporting wood products have been studied. The results of the research are summarized as follows. (1) The end checks and the time for drying from initial moisture content of about 40 percent to 5 percent moisture content in ovendry were investigated as follows: (2) The kiln dried results, for 30mm stock, which are presented by using kiln schedule table 3 are as follows: (3) The kiln schedules for ramin, meranti and oak are given respectively as follows: Ramin kiln schedule: Table 17 and Table 18. Meranti schedule : Table 12. Oak schedule : Table 15.

• 한국산림과학회지
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• 제107권3호
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• pp.266-277
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• 2018

본 연구에서는 모두베기 작업지에서 2중 무선 클램프 반송기를 적용한 굴삭기 기반 타워야더의 집재작업 생산성 및 비용을 분석하였다. 집재작업의 생산성은 $6.2m^3/SMH$(기계이용률 80.4%)이고, 비용은 $13,705won/m^3$으로 나타났다. 이 결과는 기존 연구결과에 비해 최대 집재거리가 길었음에도 불구하고 가선설치용 견인줄(Straw line)을 이용한 가선설치로 집재선 가선설치 시간이 단축되었으며, 2중 무선 클램프 반송기 적용으로 인해 생산성이 향상되고 비용이 절감된 것으로 나타났다. 또한, 원료재급과 임목축적 $137m^3/ha$ 기준으로 집재작업의 생산재적에 따른 최소작업량과 최소작업면적은 리기다소나무의 경우 각각 $558.3m^3$ 및 4.1 ha였고, 신갈나무의 경우 $433.7m^3$ 및 3.2 ha로 나타났다. 향후, 다양한 작업현장에서 집재기계별 최소작업량 및 최소작업면적에 관한 데이터를 구축하면, 집재작업에 효율적인 집재기계를 선정할 수 있을 것으로 판단된다.

• 생물환경조절학회지
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• 제27권4호
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• pp.363-370
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• 2018

다육식물인 에케베리아(Echeveria)는 최근 전세계적으로 수요가 증가하고 있지만, 번식효율이 품종이나 환경요인의 영향을 크게 받으므로 연중 고품질 묘를 공급하는 것이 어렵다. 이 연구는 밀폐형 식물공장 내에서 LED 파장 조합이 에케베리아 엽삽번식 효율에 미치는 영향을 구명하여 주년 생산의 기초자료를 제공하고자 실시되었다. 번식이 어려운 'Afterglow(AG)', 'Berkeley Light(BL)', 'Mason(MS)', 'Subsessilis Light(SL)', 'Cream Tea(CT)', 'Ben Badis(BB)' 등 6품종의 모주로 부터 균일한 잎을 채취하여 실내온도 $24{\pm}2^{\circ}C$, 상대습도 $60{\pm}10%$의 식물공장 내에서 혼합상토에 삽목하였다. 청색(B, 450nm), 녹색(G, 530nm), 적색(R, 660nm), 원적색(FR, 730nm) LED를 이용하여 R10, R8+B2, R5+B5, R7+B2+FR1, R7+B2+G1의 비율로 광질을 달리하여 처리하였고, PPFD는 $200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, 광주기는 16/8(명/암) 시간이었다. 그 결과, 번식 효율은 품종에 따라 차이가 있었는데, 'SL'은 상대적으로 발근과 신초 형성이 쉽게 되었으나, 'AG'는 발근과 뿌리 생장이 잘 되지 않았다. LED 파장 또한 번식효율에 영향을 주었는데, B 비율이 높은 R5+B5, R7+B2+FR1, R7+B2+G1 하에서 신초 형성과 생장이 촉진된 반면, 발근과 뿌리 생장은 억제되었다. 반대로, R 비율이 높은 R10나 R8+B2 하에서는 부정근 형성 및 생장이 촉진된 반면, 신초 형성 및 생장이 억제되었다. 한편, FR은 잎의 크기와 무게를 증가시켰다. 따라서, 번식이 어려운 에케베리아 품종의 엽삽 시 번식효율을 높이기 위해서는 각 파장별 효과를 활용한 적정파장 조성에 대한 연구가 필요하다.

• 한국의류학회지
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• 제32권10호
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• pp.1571-1583
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• 2008

The study aimed to investigate the actual condition of working clothes in the Changwon National Industrial Complex and to analyze the industrial workers' satisfaction with and preference to the working clothes in terms of the clothing performance and work motion factors. 1 major companies in machinery, automotive, industrial engineering, shipbuilding and rolling stock industries located in the industrial complex were selected as the subject firms. Approximately 900 workers responded to the questionnaire designed for the research and the results derived from the research were as follows. (1) The subject employees were divided into 4 work groups, i.e. the $1^{st}$ work group: managerial, general affairs, sales, production planning; the $2^{nd}$ group: quality assurance, material planning and distribution, product inspection; the $3^{rd}$ group: electric, facilities, machinery, vehicles; and the $4^{th}$ group: cutting, pressing, rolling, welding and coating. (2) The significant work environmental factors considered by all work groups were air ventilation, noise and dust factors and in particular, the most dissatisfied factors evaluated by manufacture workers were insulation, noise, dust and vibration. (3) According to the employees' work motion evaluation, the work motion diversity and frequency increased in proportion to the degree of work intensity. Besides, manufacture workers more frequently wore the working clothes even during the off-duty hours comparing to the evaluation of the other work groups. (4) The most important clothing performance factors considered by manufacture work groups were perspiration absorption, stretch, air permeability, tactile sense softness, soil proof in order.