• Asia pacific journal of information systems
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• 제13권1호
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• pp.1-22
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• 2003

This study describes how the weights of performance measures varies depending on business strategy types, such as defenders, prospectors, analyzers, and reactors. A Balanced Scorecard has been widely used for measuring a corporate performance to incorporate financial and non-financial measures simultaneously. Because such performance measurements are related to the compensation and promotion of employees, research of weights of performance measures would be instrumental. Our test results demonstrate that the weights of the business performance measures differ in the four perspectives-financial, customer, internal process, and learning and growth. Furthermore, there is evidence that the weights of performance measures vary depending on business strategy. Our study results can be used for enhancing the quality of performance measurement systems.

• 한국의류산업학회지
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• 제5권4호
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• pp.399-407
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• 2003

The natural dyeing of silk fabric with Purple-Fleshed Sweet Potato (PSP) was investigated. The colorant was extracted with distilled water, and the color difference (${\Delta}E^*$) was increased with increasing the amount of PSP in extraction. The proper temperature and time for the extracting of colorant with PSP were $60^{\circ}C$ and 60 minutes. The optimum temperature, time and pH for the dyeing of silk with extracted PSP were $60^{\circ}C$, 60 minutes and pH 4 respectively. In various mordanted methods, the color difference values of post-mordanted silk fabric were higher than those of pre- and simultaneous-mordanted method. And the wide range of colors( GY, Y, YR, R, RP) were obtained according to various mordants, mordanting methods and mordant concentrations. Light colorfastness of the mordanted silk fabric was improved. Laundering colorfastness, dry cleaning colorfastness and perspiration colorfastness were shown to be good.

• 생약학회지
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• 제28권1호
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• pp.21-25
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• 1997

The diets with three types of triterpenoid constituents, which were isolated from Lactuca indica, provoked significant changes of serum lipoprotein-cholesterol meta bolisms of hypercholesterolemic rats induced by high-cholesterol diet, together with the reduction of atherogenic index. Especially, triterpene acetates which have triterpene moieties such as ${\beta}-amyrin$, ${\alpha}-amyrin$, lupeol, pseudotaraxasterol, taraxasterol and germanicol showed a considerable hypocholesterolemic activity. The rat given orally with triterpene acetates did not exhibit a significantly higher value of atherogenic index than that of normal rats.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2003년도 학술대회지
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• pp.291-298
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• 2003

Recently, load/unload(L/UL) process is applied to a computer information storage device due to its advantages such as lower power consumption, larger data zone, simpler fabrication of disk for no bumped parking zone, and rarer contact between the slider and media. An analysis of the transient motion for the slider is very important to design an air bearing surface (ABS) of the slider to secure the stable performance of the system. During the L/UL process, however, there are several issues occurred such as contact or collision between slider and media. Sometimes this will cause the system failure. In this study, the dynamics of the slider during the loading process are investigated through a numerical simulation using FEM analysis and experiment.

• KSTLE International Journal
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• 제1권1호
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• pp.63-68
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• 2000

Angular contact ball bearings are mainly used in the spindle, which requires high speed and stiffness. The heat generation is studied by experiments and simulations using a pair of angular contact ball bearings. The temperature variation of inner and outer races and the temperature increment distribution are measured by using thermocouples for the rotational speed, preload, viscosity of lubricant. The measured values from experiments are used to estimate the heat conduction rate. The method of oil-air lubrication is used for the experiment. The amount of conduction heat transfer to the test spindle and the convection heat transfer coefficients long the spindle are computed by using inverse method with temperature increment distribution. Total heat generation rate is estimated with the heat partition rate which is calculated from temperatures of inner and outer races. In addition, the empirical factor of oil-air lubrication method for Palmgren's heat generation model is suggested. The empirical friction coefficients, which are obtained from the experiments, depend on the preload condition, and can give us more accurate estimation of the heat generation in ball bearings.

• 한국막학회:학술대회논문집
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• 한국막학회 2008년도 춘계 총회 및 학술발표회
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• pp.231-233
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• 2008

• Journal of Biosystems Engineering
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• 제12권3호
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• pp.50-56
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• 1987

중규모 벼농가에서의 벼건조 및 저장을 위하여, 한국형 개량곳간(크기: $1.8{\times}2.4m$, 높이 : 3.2m, 규모 : 2-4 M/T)을 개발하였다. 송풍기(0.5마력) 및 공기유도닥트를 부착하여 건조 및 aeration이 가능하도록 하였으며, 저장중 양곡손실을 최소한 줄이기 위해 방서용철망, 환풍창 및 구판들을 설치하였다. 그리고 양곡의 입출고가 용이하도록 내리닫이쪽문을 설치하였다. 개발된 개량곳간을 이용하여 1981년, 1982년, 1983년 가을에 각각 수확한 물벼를 수확즉시 건조하였을 때, 기후조건, 수확시기, 수확시의 수분함량, 풍량, 송풍시간, 곳간내에서의 벼의 높이 등에 따라서 차이는 있으나 상온 통풍에 의하여 벼를 잘 건조할 수 있었다. 그리고 건조조건에 따라서 건조양상은 달랐으나 180~352시간의 건조시간이 소요되었으며, 연속 상온통풍에 의하여 건조된 벼의 품질은 비교적 양호하였다.

• Food Science and Biotechnology
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• 제16권2호
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• pp.234-237
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• 2007

Water resistance of three biopolyester films, such as poly-L-lactate (PLA), poly-hydroxybutyrate-co-valerate (PHBV), and Ecoflex, and low density polyethylene (LDPE) film was investigated by measuring contact angle of various probe liquids on the films. The properties measured were initial contact angle of water, dynamic change of the water contact angle with time, and the critical surface energy of the films. Water contact angle of the biopolyester films ($57.62-68.76^{\circ}$) was lower than that of LDPE film ($85.19^{\circ}$) indicating biopolyester films are less hydrophobic. The result of dynamic change of water contact angle also showed that the biopolyester films are less water resistant than LDPE film, but much more water resistant than cellulose-based packaging materials. Apparent critical surface energy for the biopolyester films (35.15-38.55 mN/m) was higher than that of LDPE film (28.59 mN/m) indicating LDPE film is more hydrophobic.

• 한국안전학회지
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• 제21권1호
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• pp.48-52
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• 2006

This study is a research of safety valve development for LP gas cylinder which use sintering metal. Re-searcher wishes to apply technology of sintering metal for safety valve development and do gas flow control. The basis of this study is most suitable fluid examination that to reduce gas accident. This research concluded following results. 1. When press pin length is 42mm to 45mm powder quantity is 0.25g, in case of press pin length 36mm to 42mm powder quantity is 0.2g, displayed fluid optimization. 2. When press pin length is 39mm and powder quantity is 0.25g, press pressure displayed fluid optimization at all interests from $1.2\;tons/cm^{2}\;to\;2\;tons/cm^{2}$. 3. When apparent density is about $5.0g/cm^{3}\;to\;4.5g/cm^{3}$, fluid optimization becomes.

• Food Science and Biotechnology
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• 제18권1호
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• pp.202-206
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• 2009

Drying characteristics of fresh Korean-type rehmannia (jiwhang) noodle was investigated to determine drying kinetic parameters under the experimental conditions of 5 temperatures (30, 40, 60, 80, and $90^{\circ}C$). Drying curve of the noodle showed a biphasic pattern of decrease in drying rate with initial rapid drying followed by slow dehydration as the progress in drying. In all drying conditions, only falling drying rate period was observed and the drying rate of the noodle was greatly influenced by the drying temperature. The effective diffusion coefficients ($D_{eff}$) were determined by the diffusion model and their temperature dependency was determined using an Arrhenius equation. The activation energy ($E_a$) values for the drying of the noodle were 19.94 and 21.09 kJ/mol at the initial and the latter stage of dehydration, which were comparable to those of pasta or Japanese udong dehydration.