• 한국초지조사료학회지
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• 제32권1호
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• pp.75-84
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• 2012

본 연구는 겨울철과 여름철에 답리작 사료작물의 랩사일리지 생산에서 연구보고된 조사료 재배품종과 재배방법을 기준으로 하였을 때, 소요 기계에 따른 기계화 생산 작업의 특성과 부담면적, 기계 이용비용을 분석하여 조사료 생산비용을 산출하였다. 생산비용은 작물종류(호밀, 청보리, IRG, 수단그라스), 파종방법(산파, 조파)과 트랙터 마력(50, 75, 100, 130 ps)에 따른 경작규모별(부담면적 ha별), 부담면적대비 경작지비율별(25, 50, 75, 100%), 작부체계별(품종 숙기별, 동 하계 작물별)로 분류하여 산출하였다. 트랙터 100 ps, 조파를 기준으로 단일 품종 재배보다 호밀, IRG와 청보리 등을 품종 숙기별로 재배할 때 파종은 20일에서 30일로, 수확은 약 30일에서 40일로 시기가 늘어나기 때문에 부담면적이 57.1 ha에서 77.5 ha로 증가하였다. 동 하계 작물 연중 재배시 생산비용은 100 ps 트랙터, 조파, kg-TDN 기준으로 호밀+수단은 250원, 청보리+수단은 215원, IRG+수단은 234원, 호밀+청보리+IRG+수단은 233원으로 나타났다. 이는 연중 재배하지 않는 경우에 비해 고정비가 줄어들기 때문에 생산비용은 약 30~50% 절감되었다. 따라서 답리작 사료작물의 랩사일리지 생산시 노동피크와 수확시기의 분산, 기계장비의 효율성을 제고할 수 있도록 품종 숙기별 연중 재배 작부체계의 이용이 바람직한 것으로 판단되었다.

• Journal of Biosystems Engineering
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• 제28권2호
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• pp.107-116
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• 2003

One of the major obstructing factors against managing dairy farm in Korea has been a shortage of roughage supply. The shortage of roughage caused excessive use of concentrate feed increase of production cost and deterioration of cattle quality. In order to solve this problem for the dairy farm, use of fallow paddy field in the winter was feasible to produce barley and rye forage during the winter season after harvesting of in. And many desirable effects of raising cattle productivity, saving dollars for importing feeds and providing huge ground for manure spreading are expected by enlarged local roughage production. Through analysing the forage producing process, a mechanized operation model was developed for dairy farms in Korea. Its model consists of seeding models(till, no-till model) and harvesting models(wrap silage, traditional silage, hay model). Currently, the government policies are being executed to urge producing winter cereal wrap silage in the fallow paddy field with various supporting programs. Ant with enlarged local forage production, it is possible to make a new huge market fur forage producing machine.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1995년도 춘계학술대회논문집
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• pp.196-202
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• 1995

Drawbead formulation is the first process together with a binder wrap process in a sheet metal forming process. The purpose of a drawbead is to control the flow of the metal into the die in panel press forming. To simulate the drawbead formation process, an elasto-plastic finite element formulation is derived from the equilibrium equation an drelated boundary conditions considering the proper contact conditons. The developed finite element program is applied to drawbead formation in the plane strain condition. The simulation of drawbead formation produces the distribution fo stress and strain along the bead and the resultant elongation of the sheet in the cavity region with respect to various cavity dimensions of the sheet as well as the punch force of a drawbead and the amount of draw-in with respect to the stroke fo a drawbead. The numerical resutls provides the fundamental information as a boundary condition to analyze the complex binder wrap phenomena and panel press forming in simple way.

• 한국정밀공학회지
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• 제13권1호
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• pp.69-77
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• 1996

To design high-effective profile in screw rotor profile using in screw compressor, we design the symmetric type changing the number of lobes and the non-symmetric type changing the neighbourhood of the top point of lobe. Then, we calculated the performance value of profile according to the scale of these non-symmetric's wrap angle. We had the results as follows. 1. About the non-symmetric case, the larger a wrap angle is the shorter seal line is and the smaller blow hole is, thus we know what the large wrap angle profile is better than the small one. 2. We know what the non-symmetric profile is better than the symmetric profile in the result of the compare of seal line's length, blow hole's area, volume curve. 3. About the non-symmetric case, the deformation of the neighbourhood of lobe's top point of the rotor profile has a large effect upon the increase of performance because the length of seal line became short and the area of blow hole is small.

• International Journal of Air-Conditioning and Refrigeration
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• 제16권4호
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• pp.124-129
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• 2008

Design practice has been made on an oil-less scroll air compressor as an air supply device for a 2 kW fuel cell system where air pressure of 2 bar and flow rate of 120 liter/min are required. Basic structure of the scroll compressor includes double-sided scroll wrap for the orbiting scroll driven by two crankshafts connected to each other by a timing belt. These features can eliminate thrust surface which otherwise would produce frictional heat and jeopardize reliable operation of the orbiting scroll and the scroll element's deformation as well. This study focuses on optimum scroll wrap design; orbiting radius has been chosen as an independent design parameter. As the orbiting radius changes, scroll sizes such as scroll base plate and discharge port diameters change accordingly. Gas compression-related losses and mechanical loss also change with the orbiting radius. With a scroll base plate diameter of 120mm at most and discharge port of at least 10mm, the orbiting radius should be within the range of 2.5-4.0mm. With this range of the orbiting radius, it was estimated by performance analysis that the compressor efficiency reached to a maximum of ${\eta}_c$=96% at the orbiting radius of $r_s$=3.5mm for the scroll wrap height-to-thickness ratio of h/t=5.

• 설비공학논문집
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• 제24권2호
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• pp.164-173
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• 2012

To study the applicability of a scroll type compressor to small capacity refrigerators, a R600a scroll compressor with algebraic scroll wrap has been designed. Its size and performance have been compared to a reciprocating type of the same displacement volume. By employing scroll wrap based on algebraic curve, high compression ratio can be accomplished without increasing the wrap angle much so that compact scroll may be obtained. Compared to a reciprocating one, the designed scroll compressor has diameter and height reduced by about 50% and 80%, respectively. By numerical simulation, it has been estimated that the scroll compressor provides 38.6% more cooling capacity than reciprocating type with 8.9% more power consumption, resulting in 27.3% increase in COP for ASHRAE low back pressure condition. With increasing the operating pressure ratio from 9.5 to 15.3, the overall compressor efficiency of the scroll compressor decreases from 72.6% to 65.2%, while that of the reciprocating compressor increases from 55.7% to 59.8%.

• 산학경영연구
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• 제17권
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• pp.137-151
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• 2004

금융기관의 랩 어카운트 마케팅이 성공하기 위해서는 고객의 세분화, 목표시장 선정, 포지셔닝 전략이 효과적으로 수립, 집행되어야 한다. 그러나 마케팅과 재무관리 분야의 기존 연구를 살펴보면 랩 어카운트 고객을 체계적으로 분석하여 STP 전략을 제시한 연구는 국내외를 막론하고 부재한 실정이다. 랩 어카운트 마케팅 전략은 개인투자자의 투자위험성향을 파악하여 포트폴리오 구성에 반영하는 것에서 비롯된다. 이를 위해서는 투자위험성향을 정확히 측정할 수 있는 척도가 필요한데 현재 국내외를 막론하고 체계적으로 투자위험성향을 측정하지 못하는 실정이며 결과적으로 효과적인 마케팅 전략을 수립하지 못하고 있다. 따라서 본 연구에서는 효과적인 랩 어카운트 마케팅 전략을 제시하기 위하여 (1) 랩 어카운트를 이론적으로 정리하고, (2) 랩 어카운트 투자위험 성향을 설명하는 주요 변수를 도출하여, (3) 고객을 투자위험성향에 따라 분류하는 모형을 제시하고자 한다. 구체적으로 본 연구에서는 2개의 가설을 제시하고 실증적으로 검증하였다. 가설 1에서는 랩 어카운트 고객의 투자위험성향과 수익성 추구성향 간 유의적인 상관관계가 검증하였고, 가설 2에서는 랩어카운트 고객의 군집화에 있어 투자위험성향과 관련된 세분화 변수들간 차별적인 판별력을 검증하였다. 가설 검증 결과에 기초하여 금융기관은 랩 어카운트 고객을 세분화하고, 목표시장을 설정하여, 랩 어카운트 상품의 독특한 포지셔닝 전략을 수립할 수 있다.

• 한국축산식품학회지
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• 제38권2호
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• pp.251-258
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• 2018

We investigated microbial and quality changes in wrap-packaged dry-aged beef after completion of aging and subsequent storage in a refrigerator. After 28 days of dry aging (temperature, $4^{\circ}C$; RH, approximately 75%; air flow velocity, 2.5 m/s), sirloins were trimmed, wrap-packaged, and stored at $4^{\circ}C$ for 7 days. Analyses of microbial growth, pH, volatile basic nitrogen (VBN), 2-thiobarbituric acid-reactive substance (TABRS), and instrumental color, myoglobin, and sensory evaluation were conducted on days 0, 3, 5, and 7. The results show that the number of total aerobic bacteria (TAB), yeast, and lactic acid bacteria increased with an increase in storage days, whereas no change in the growth of mold was observed during 7 days of storage. Based on the legal standard for TAB count, the estimated shelf-life of wrap-packaged dry-aged beef was predicted to be less than 12.2 days. However, the shelflife should be less than 6.3 days, considering the result of sensory quality (odor, taste, and overall acceptance). No significant change in visible appearance was also observed during 7 days of storage. The results suggest that the present quality indicators for meat spoilage (pH, VBN, and TBARS) should be re-considered for dry-aged beef, as its characteristics are different from those of fresh and/or wet-aged beef.

• 한국식품과학회지
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• 제33권4호
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• pp.416-422
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• 2001

식품포장용 PVC제인 wrap, sheet 및 gasket으로부터 식품 유사용매와 식품으로 이행되는 알킬페놀류를 HPLC와 GC/MSD로 분석하였다. 세 가지 모든 재질에서 7개의 nonyl phenol 이성질체만이 검출되었고 다른 알킬페놀류는 검출되지 않았으며, wrap이 sheet와 gasket보다 그 함량이 높았다. 각 포장재질로부터 수용성 식품유사용매(증류수, 4% acetic acid, 20% ethanol)와 지용성 식품유사용매(n-heptane)에 의한 nonyl phenol의 용출량은 처리온도 $60^{\circ}C$보다는 $95^{\circ}C$에서, 수용성보다는 지용성 식품유사용매에서 각각 많았고, 또한 wrap에서 sheet와 gasket보다 그 양이 많았다. PVC gasket을 사용한 과일쥬스, olefin계 gasket을 사용한 유아용 쥬스, olefin계 병마개를 사용한 음료에서 nonyl phenol이 각각 포장재로부터 이행되었으며, 포장하기 전의 이들 식품에서도 nonyl phenol이 검출되었다.

• 복식
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• 제3권
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• pp.29-46
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• 1980

The purpose of this thesis is to find out how the upper garment styles in the Ancient East and est had been influenced with each other. Analytical studies conclude the fellowing findings: 1) Upper garment styles in the feat Asia and the Egypt already highly developed in 28th century B.C. and show us the original style of the wrap-over to the left and that of the round neckline(曲領). Upper garment of the open in the center front shown in Babylonia in 18th century B.C. had been inherited to the caftan of the Hebrew and later succeeded to the Persia. 2) The tunic styles of the round neckline, the wrap-over to the left and the open in the cotter front, which were the basic styles of the upper garment, had teen widely accepted to the central Asia and the East Asia, as well as the Northern Europe, from the West Asia. 3) The styles of the wrap-over to the right originated from China since it had begun to show in the Shang Dynasty(商代, 殷代). 4) The East and the West costumes had been very much intermixed in 4th century B.C. Alexander the Great of Macedoria in 4th century B.C. expanded his territory to the central Asia and built up the Bacteria, when the most western civilization had been greatly transmitted to the Orient. Meanwhile the tunic being clad in the West and Central Asia began to be worn by soldiers in the period of the Warring States in China (326-299 B.C.) and afterwards worn even by civil officials since the age of the T'ang Dynasty of China. 5) The Upper garments of the open in the center front, the wrap-over to the right, the wrap-over to the left and the round neckline were found in Korea, which mean that the upper garment styles in the Ancient Korea were intermixed of the factors from the West Asia, the central Asia and the East Asia. 6) The styles of costume in the East Asia were influenced by the West Asia through the central Asia. The upper garment styles Europe were also influenced by the West Asia. Thus the upper garment styles in the Ancient East and West had been mutually affected with each other.