• International Commerce and Information Review
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• v.19 no.1
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• pp.235-256
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• 2017

This study is to analyse how trust and asset specificity among partner firms affect on performance of international joint venture(IJV). Especially, the analysis was mainly based on a quadratic model. While it assumes that the previous studies was based on linear model in the relationship between trust, asset specificity and the performance, this study proceeds a empirical analysis by setting up a hypothesis; it would be quadratic relationship between trust, asset specificity and performance which are based on social capital theory and transaction cost theory. The survey was held with 74 manufactures who were established as an IJV by Korean and foreign firms together. In the result of the empirical analysis, trust shows an inverted U-shaped relationship with IJV performance. Also, asset specificity shows the U-shaped relationship with IJV performance. The results suggest that it needs to control and maintain the trust level among the partners in order not to lose an appropriate control caused by too much trust. In order to minimize the cost generated by asset specificity and to transform it into positive impact, it needs a control and the operation of monitoring system on the opportunistic action of the partners. Furthermore, it needs to keep organizational flexibility and innovativeness to continuously develop new capabilities.

• 한국IT서비스학회:학술대회논문집
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• 2006.11a
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• pp.261-270
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• 2006

The present study analyzes the social equilibrium of wireless internet platform market before and after the adoption of WIPI(Wireless Internet Platform for Interoperability). When market prevails operator ownership, as opposed to manufacturer ownership, with heterogenous platforms becomes a more likely and desirable solution. After the adoption of WIPI, social equilibrium is achieved only if operators perceive that the cost reduction and the interoperability effects from investing in WIPI fully offset the appropriation effect from investing in heterogenous platforms.

• Proceedings of the Korea Association of Information Systems Conference
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• 1997.10a
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• pp.503-525
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• 1997

정보시스템 아웃소싱(outsourcing)의 적용 범위와 그 규모가 증대함에 따라, 아웃 소싱은 정보시스템의 관리에서 근본적인 이슈로 등장하게 되었다. 정보시스템 아웃소싱의 중요성이 인식되었으나, 그에 대한 실증적 연구는 매우 미흡한 설정이다. 본 연구의 주요 목적은 정보시스템 아웃소싱에 있어 고객회사(client firm)와 서비스 제공업자(vendor)간의 관계의 성공 및 실패에 영향을 미치는 요인을 조사하는 것이다. 본 연구의 연구 모델은 관 계적거래이론(relational exchange theory), 커뮤니케이션 행동(communication behavior), 거래비용분석(transaction cost analysis) 등의 조직간관계(interorganizational relationship) 이론에 기반을 두고 작성되었다. 미국의 207개 회사의 정보시스템 아웃소싱 설문조사에 의 하여 다음과 같은 연구결과가 도출되었다. (1) 서비스 제공업자의 능력(vendor capability), 관계결속성(solidarity), 관계지속성(continuity expectation), 유연성(flexibility), 서비스업자의 활동에 대한 모니터링(monitoring of the vendor), 참여도(participation) 등이 아웃소싱 관 계의 성공과 양의 상관관계를 가지고 있으며, (2) 역할연합도(role integrity), 자산특이성 (asset specificity) 등은 아웃소싱 관계의 성공과 음의 관계를 가지고 있는 것으로 나타났 다. 이 결과에 의하면, 비관계적 거래(discrete exchange) 보다는, 관계적 거래(relational exchange)에 기반을 두어 아웃소싱 관계를 운영하는 것이 아웃소싱의 성공적인 구현을 필 수적으로 보여진다. 이 연구 결과를 기초로 하여 아웃소싱 대상 업무의 선택, 서비스 제공 업자의 선택, 그리고 아웃소싱 관계의 지속적인 관리를 위한 지침을 제시하였다.

• Journal of Information Technology Application
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• v.1 no.3_4
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• pp.113-132
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• 1999

실증적인 연구들에 의하면 고객회사(client firms)와 서비스 제공업자(vendor) 간의 파트너십의 질과 범위가 정보시스템 아웃소싱의 성공적인 구현에 결정적인 역할을 하는 것으로 알려졌다. 본 연구는 이러한 정보시스템 아웃소싱 구현에 있어서 파트너십의 역할을 좀 더 심층적으로 분석하려는 노력의 일환이다. 본 연구에서의 기본 명제는 파트너십 특성들의 아웃소싱 구현에의 효과는 아웃소싱 업무의 특성(task characteristics)과 같은 상황적 요인에 의해 영향을 받을 수 있다는 것이다. 구체적으로 본 연구에서는 자산특이성(asset specificity)과 파트너십 특성간의 상호효과(interaction effect)에 중점을 두고 조사를 하게되는데, 파트너십은 관계적거래 특성(relational exchange characteristics)에 의해 구체화되었다. 207개의 미국 회사의 아웃소싱 관계를 대상으로 한 설문조사를 기반으로 한 결과에 의하면, 전반적으로 비관계적거래(discrete exchange)보다 관계적거래에 기반을 두고 아웃소싱 관계를 운영하는 것이 아웃소싱의 성공적 구현을 위하여 필수적인 것으로 보인다. 한편 상호효과를 조사하기 위해서는 MRA와 하위그룹분석(subgroup analysis)을 시행하였는데, 자산특이성과 일부 관계적거래 특성들간에 상호효과가 유의성이 있음을 발견하였다. 발견된 상호효과를 근거로 상황 변수를 고려하지 않은 연구 결과 중 확실하지 않은 결과(inconclusive results)에 대한 해석을 시도하였다.

• Research in Plant Disease
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• v.23 no.4
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• pp.314-321
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• 2017

Acidovorax valerianellae had been reported a causal agent of bacterial black spot disease on corn salad in France, 2003 and on watermelon in Korea 2011. In this study, difference in host specificity between 2 groups, corn salad strains and watermelon strains, of Acidovorax valerianellae was recognized and compared. In the pathogenicity test, all 5 watermelon strains showed pathogenicity on the 6 Cucurbitaceae plants but not on corn salad, whereas 4 corn salad strains showed pathogenicity only on the corn salad. Utilization of Biolog substrates was different between watermelon strains and corn salad strains on 4 substrates, Malonic Acid, ${\alpha}-Hydroxybutyric$ Acid, ${\alpha}-Keto$ Butyric Acid, and Glycyl-L Glutamic Acid. The phylogenetic tree built with the 16S rDNA sequences showed that all of A. valerianellae stains was grouped into 1 clade separating from the other species of Acidovorax genus. Within A. valerianellae clade, watermelon strains and corn salad strains were separated into 2 sub-groups. REP-PCR analysis also separated the two groups. Host specificity, substrate utilization, and some genetic characteristics suggested that there are two pathogenic groups, watermelon group and corn salad group in A. valerianellae.

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2002.11a
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• pp.114-114
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• 2002

포유동물에서 뇌와 부신에서 합성.분비되는 카테콜아민(Catecholamine, CA)계 신경전달물질인 dopamine(DA), norepinephrine(NE), epinephrine(E)은 체내 각종 생리현상의 조절에 필수적이며, 생식과 관련지어서는 시상하부-뇌하수체 간 GnRH-gonadotropin 호르몬 축의 활성을 조절하는 기능 외에도 번식과 관련된 여러 행동양식을 조절함이 잘 알려져 있다. 본 연구는 CA 생합성 효소들인 tyrosine hydroxylase(TH), dopamine beta-hydroxylase(DBH), phenylethanolamine-N-methyltransferase(PNMT)의 유전자 발현에 미치는 sex steroid의 영향을 조사하였다. 성숙한 암컷 횐쥐(SD strain)의 난소를 제거하고 1주 경과 후 vehicle(sesame oil; OVX+Oil 실험군) 또는 estradiol 17$\beta$(235ug/m1; OVX+E$_2$실험군)이 든 silastic capsule(길이 14mm; 내경 1.55mm; 외경 3.125mm)을 48 시간 동안 처리한 뒤 희생시켰다. 적출된 조직으로부터 RNA를 추출한 후 semi-quantitative RT-PCR을 시행하였다. (i) TH의 발현 정도는 OVX+Oil 군에서는 시상하부) substantia nigra(SNc)) 부신 순으로, OVX+E$_2$군에서는 SN글 부신) 시상하부 순으로 나타났다. TH 발현에 미치는 estradiol의 효과로 SNc과 부신에서는 유의한 증가를 보인데 비해 시상하부에서는 유의한 감소를 관찰하였다. (ii) DBH 발현 정도는 OVX+Oil군에서는 SNc> 부신> 시상 하부 순으로, OVX+E$_2$군에서는 부신＞ SNc＞ 시상하부 순이었다. DBH 발현에 미치는 estradiol의 효과로 SNc에서는 유의한 감소, 부신에서는 유의한 증가, 그리고 시상하부에서는 통계적 유의성은 없으나 감소하는 경향을 보였다. (iii) PNMT의 발현의 경우 SNc와 시상하부에서는 기보고된 바와 같이 alternative splicing에 의해 110bp 차이의 크고 작은 두 형태의 cDNA(PNMTI & PNMTs)가 증폭되었으나 부신에서는 작은 cDNA 만이 관찰되었다. PNMTs의 발현 정도는 OVX+Oil군과 OVX+E$_2$군에서 공히 부신＞ 시상하부＞ SNc 순이었고, PNMTI의 발현은 SNc가 시상하부 보다 다소 높은 경향이었으나 유의성은 없었다. PNMTs 발현에 미치는 estradiol의 효과로 SNc에서는 유의한 감소, 부신에서는 유의한 증가, 그리고 시상하부에서는 통계적 유의성은 없으나 증가하는 경향을 보였다. 본 연구에서는 CA 생합성 효소들의 유전자 발현의 조절에 미치는 estrogen 의 영향이 세포 기원이 neural crest cell인 부신 수질은 물론 뇌의 상이한 지역간에서도 조직특이적임을 관찰하였다. 이러한 결과는 각 조직에서의 estrogen 수용체 유형의 차이 혹은 작용 모드와 각 효소 유전자 발현 사이에 중요한 상관관계가 있음을 시사한다.

• Microbiology and Biotechnology Letters
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• v.14 no.6
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• pp.473-478
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• 1986

In order to elucidate the patterns of natural oils and fats assimilation by microorganisms, lipases properties of yeast and bacterium strain, Torulopsis candia Y-128 and Acinetobacter calcoaceticus KB-2, which could assimilate palm oil efficiently, were investigated. T candida Y-128 attached palm oil droplets directly, and assimilated unsaturated fatty acid more easily than saturated acids liberated by the action of its lipase. Lipase of A. calcoaceticus KB-2 was extracellular and appeared quickly from the beginning of log phase of growth, whereas lipase of f candida Y-128 appealed intracellular. The lipases of two strains seem to be only enough to utilize the lipid materials for their own growth, without accumulation of lipases in the culture broth. Lipases of the strains have 1 (3-)-positional specificities on triglycerides. The patterns of palm oil assimilation showed that two strains attached droplets of lipid materials directly and split off fatty acids at 1 (3-)-position of triglycerides first, and assimilated the reaction products via fatty acids metabolic pathway.

• Korean Journal of Food Science and Technology
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• v.20 no.3
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• pp.310-316
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• 1988

The gelatinized model food system were prepared by combining moisture, starch and protein, and the textural properties of their gels of different temperatures and times of heating were investigated by the use of Instron Universal Testing Machine. The hardness, springiness, cohesiveness, gumminess and chewiness of model foods had a high correlation with solid content and the regression equations between the hardness of model foods and moisture content heated for 20min. at $80{\circ}C$ were as follows; $H(PS_4)=18.6405-3.8201M+0.1959M^2,\;H(P_1S_1)=244.7933-5.692M+0.0332M^2,\;H(P_4S)=693.0292-16.6884M+0.1005M^2$, The correlation coefficients were $0.996^{**},\;0.998^{**}\;and\;0.998^{**}$, respectively. Total correlations between textural parameters and temperature and heating times were different according to model foods. The correlation between textural parameters was proportional to protein foods, but the hardness and cohesiveness of starch foods showed the relationship of inverse proportion. Under low solid content, the parameters of model foods appeared to decrease as protein content increased. Under high solid content, the parameters of protein foods were higher than those of starch foods above some level of protein content. The regression equation between the hardness and protein content heated for 20min. at $80^{\circ}C$ was as follows; Hardness(20%)=5.6858-13.5670P+$9.7758P^2$ and the correlation coefficient was $0.95^{**}$.

• Journal of Applied Biological Chemistry
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• v.62 no.3
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• pp.287-292
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• 2019

Pseudomonas tolaasii causes brown blotch disease on the oyster mushroom (Pleurotus ostreatus). Various pathogenic strains of P. tolaasii were isolated and divided into three subtypes, $P1{\alpha}$, $P1{\beta}$, and $P1{\gamma}$. For phage therapy, bacteriophages against to these subtype strains were applied to mushroom cultivation and very successful to prevent from the disease. In this study, bacteriophages were isolated against the representative strains of subtype pathogens and their polyclonal antibodies were synthesized to investigate structural relationship among capsid proteins of phages. Phage preparations over $10^{10}pfu/mL$ were injected to rabbit thigh muscle and polyclonal antibodies were obtained after three times of boost injection. Titers of the antibodies obtained were over $2{\times}10^7Ab/mL$ for the phage ${\phi}6264$, $1{\times}10^6Ab/mL$ for the phage ${\phi}HK2$, and $1{\times}10^7Ab/mL$ for the phage ${\phi}HK19$ and phage ${\phi}HK23$. High specific activities were observed between antibodies and the corresponding bacteriophages. Some cross-reactivities between the antibodies and non-corresponding bacteriophages were also measured. Antibody $Ab{\phi}6264$ inactivated all phages of $P1{\alpha}$ subtype and only phage ${\phi}HK16$ among $P1{\beta}$ subtype phages. Antibody $Ab{\phi}HK23$ of $P1{\gamma}$ subtype neutralized all phages of $P1{\beta}$ subtype as well as the phage ${\phi}HK23$, showing the widest phage-inactivation range. When the structural-similarity studies of phages were investigated by using phage antibodies, closeness obtained by phylogenetic analysis of 16S rRNA genes of pathogenic strains were quite different from that of polyclonal antibody-specific structural similarity of phage capsid proteins. In conclusion, there is weak correlation between the host strain specificity of bacteriophage and its capsid structural similarity measured by phage antibodies.

• Journal of the Korean Society of Food Science and Nutrition
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• v.8 no.1
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• pp.1-8
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• 1979

To find out effective cultural methods of soybean sprouts, soaking time, irrigation number and culture temperature influencing on the soybean sprouts were investigated. The optimum soaking was the time which the soybean weight reached the double comparing the initial weight. The relationship between soaking time and temperature could be expressed as ${\hat{Y}}=-0.298x+14.463$(${\hat{Y}}$;time, x; temperature). The optimum number of irrigation was the four times per one day, observing the fresh weight of sprouts, length of axis, length of edible axis and length of roots. Considering only length of axis, optimum temperature was $25^{\circ}C$ but it was estimated to $21-22^{\circ}C$ minimizing the loss of dry weight and nitrogen.