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정인식,김진섭,이정희,이종현,신장규,박세일,권성원,Jung, In-Sik,Kim, Jin-Sup,Lee, Jung-Hee,Lee, Jong-Hyun,Shin, Jang-Kyoo,Park, Se-Il,Kwon, Sung-Won 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.9
박막형 다중접합 열전변환기의 시간에 따른 출력 전압 변화를 감소시키기 위해 벌크의 저항온도계수가 매우 적은 EVANOHM-S 합금을 박막 히터재료로 사용하였고, 또한 Seebeck 계수차이가 비교적 작은 크로멜-알루멜 열전쌍을 박막 열전퇴(thermopile)의 열전요소로 하였다. EVANOHM-S 박막 히터의 저항온도계수는 약 $1.4 {\times} 10^4/^{\circ}C$ 였고, 크로멜-알루멜 박막 열전쌍의 Seebeck 계수차이는 약 $38 {\mu}V/K$였다. 열전변환기의 출력 전압 변화는 공기중에서 처음 120초 동안 약 0.06%였고, 약 5분간이상 히터의 예열후 출력전압 변화는 현저히 감소하였다. 10 Hz ~ 10 kHz의 주파수 범위에서 열전변환기의 교류-직류 전압 및 전류 변환 오차범위는 각각 ${\pm}$1.6 ppm 및 ${\pm}$0.7 ppm이었고, 10Hz 이하 또는 10 kHz 이상의 주파수에서는 교류-직류 변환오차가 크게 증가하였다. For the purpose of reducing the output voltage fluctuation of thin film multijunction thermal converter, EVANOHM alloy-S and chromel-alumel thermocouple were used as a thin film heater material and as a thermoelement of thrmopile, respectively. The temperature coefficient of the resistance of thin film EVANOHM alloy-S heater was about $1.4 {\times} 10^4/^{\circ}C$, which is very small compared to other materials, and thin film chromel-alumel thermocouple showed relatively small difference of the Seebeck coefficients about $38 {\mu}V/K$. The output voltage fluctuation of the thermal converter was about 0.06% for the initial 120 seconds in air and decreased considerably after preheating for 5 minutes or more. The respective AC-DC voltage and current transfer error ranges of the thermal converter were about ${\pm}$1.6 ppm and ${\pm}$0.7 ppm in the frequency range from 10Hz to 10 kHz and increased remarkably below 10 Hz or above 10 kHz.
5'-Untranslated Region에 존재하는 Iron Responsive Element에 의한 Ferritin 합성조절
정인식,이중림,김해영,Chung, In-Sik,Lee, Jung-Lim,Kim, Hae-Yeong 한국응용생명화학회 1998 Applied Biological Chemistry (Appl Biol Chem) Vol.33 No.2
철의 대사과정에 관여하는 ferritin 단백질의 발현은 ferritin transcript의 5'-untranslated region에 위치한 iron-responsive element (IRE)와 철 농도 조절 단백질의 결합에 의해 조절된다. 이러한 ferritin의 생성에 관여하는 구조적인 요소를 밝히기 위해, RNA 이차구조인 IRE의 bulge 부분을 다른 염기로 변환시켜 철 농도 조절단백질에 의한 RNA 결합력과 ferritin 단백질의 생성의 저해정도를 비교 측정하였다. 측정된 결과로부터 IRE의 bulge 부분의 시토신 염기배열만이 RNA 이차구조의 형성에 중요한 작용을 하여 ferritin 합성을 조절할 수 있는 것을 보였다. The expression of ferritin involved in iron metabolism is regulated at the translational level by the interaction of iron regulatory protein with iron-responsive element(IRE) in the 5'-untranslated region of ferritin transcript. To identify the role of structural element utilized for translational regulation of ferritin, we studied the effects of mutations in the ferritin IRE by measuring IRP binding activity and translational activity. Our data suggest that the cytosine at bulged position of IRE within ferritin is important for the formation of RNA secondary structure involved in translational regulation.
정인식(In Sik Chung),이원영(Won Young Lee),김재광(Jae Kwang Kim),김응국(Eung Kook Kim),김정수(Jeong Soo Kim),전해명(Hae Myung Jeon),민도준(Do Jun Min),추교영(Gyo Young Chu) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.5
Pancreatic duct stones are occasionally seen in the patient with chronic relapsinq pancreatitis. It has various etiologic associations and chronic alcoholism is believed to be the most important etiologic factar among them. Most investigators have considered the panceatic calculi as a complication of the chronic pancreatitis, not as a distinct disease Although the role of pancreatic stone protein is being studied, the pathogenesis of stone formation is not proved. The size of pancreatic stone varies frorn minute, sand-like particles to large solitary or multiplc calculi. The largest stone that has been reported was 4.5cm long. We report a rare case of large staghorn pancreatic duct stone (4.2 cm in length) in a 36-year-old non-alcoholic female without pancreatitis.
마케팅 표준화와 기업 성과의 비선형적 관계에 대한 연구
정인식 ( In Sik Jeong ),김은미 ( Eun Mi Kim ) 한국국제경영학회 2012 國際經營硏究 Vol.23 No.2
Over nearly four decades, the debate over how much a firm should standardize its marketing strategy in foreign markets has received focal attention in the international marketing literature. Yet, past empirical studies have yielded no consistent relationship between marketing standardization and firm performance. One possible explanation for these mixed results, we argue, may relate to some basic assumptions about the nature of this relationship. The marketing standardization-performance relationship may be more complex than has been theoretically argued and empirically researched. Standardization can certainly generate a large number of benefits. After a certain level, however, there may be a decrease in positive effects of standardization as well as rising costs. According to this logic, we expect standardization can positively impact performance up to a point, but that increase in negative effects will outweigh any increase in positive ones after that level is reached. To examine the proposed relationship between standardization and performance, this study surveyed a sample of Korean firms exporting consumer products. The findings indicate that increasing levels of standardization bring significant performance benefits up to a certain optimum level beyond which benefits begin to decelerate, while costs accelerate.
정인식 ( In Sik Chung ),이인석 ( In Seok Lee ),최명규 ( Myung Gyu Choi ),박두호 ( Doo Ho Park ),김상우 ( Sang Woo Kim ),양영상 ( Young Sang Yang ),허원행 ( Won Haing Hur ),조영석 ( Young Seok Jo ),정정조 ( Jung Jo Jung ),김병기 ( 대한소화기학회 2001 대한소화기학회지 Vol.38 No.5
Squamous cell carcinoma of gallbladder is rare and its pathogenesis is unknown. A 63-year-old woman presented with right upper quadrant pain. Investigations revealed irregular and ill-defined heterogenous soft tissue mass in gallbladder fossa, which was infiltrated to the liver, pancreatic head, and duodenum on CT scan. Biopsy of liver and duodenum confirmed it as squamous cell carcinoma. Because the normal gallbladder does not have a squamous epithelium, squamous cell carcinoma of gallbladder has been the subject of interest in several publications. We report a case of squamous cell carcinoma of gallbladder. (Korean J Gastroenterol 2001;38:389- 392)
중소기업의 국제지향적인 신제품전략이 성과에 미치는 영향
정인식(In-sik Jeong),변정희(Jung-hee Byun),김은미(Eun-mi Kim) 한국산업경영학회 2011 經營硏究 Vol.26 No.3
최근 자유무역의 확대로 중소기업의 국제화가 가속화되고 있다. 중소기업은 대기업에 비해 자원과 국제경험의 부족으로 경쟁에서 어려움을 겪게 되지만, 국내시장이 협소하기 때문에, 해외시장의 판매 기회를 찾고, 향후에 시장 경쟁력을 높이기 위해서 중소기업의 국제화는 증가하고 있다. 또한 국제시장에서 제품수명주기가 짧아지면서 신속한 신제품개발은 기업의 성과를 높이는데 중요한 요인으로 부각되고 있다. 따라서 본 연구는 한국 중소기업을 대상으로 국제화와 신제품 전략을 함께 보고자하며, 국제지향적인 신제품전략이 성과에 미치는 영향을 보고자 한다. 또한 기존문헌에 의하면 내ㆍ외부 환경적 요인이 신제품성과에 영향을 미치고 있음을 시사하고 있기 때문에, 환경 불확실성과 조직통합의 조절 효과를 보고자 한다. 연구결과, 첫째, 국제지향성은 신제품성과에 긍정적인 영향을 주는 것으로 나타났다. 둘째, 환경불확실성은 부의 조절효과를 보여, 환경이 불확실할수록 국제지향성과 신제품성과와의 관계는 약해지는 것으로 나타났다. 마지막으로, 조직통합은 국제지향성과 성과 간의 관계에 유의한 조절효과를 주지 않는 것으로 나타났다. Recently, internationalization of SMEs are getting accelerated due to the expansion of free trade. Since SMEs have difficulties from a scarcity of resources and a lack of international experience, they might have less competitive advantages than large companies. Despite of these problems, SMEs have entered overseas markets increasingly for heightening opportunities and competitiveness. In addition, as the product life cycle is getting shorter in international market, the prompt development of new products becomes important an element to increase corporate performance. Therefore NPD strategies of SMEs are important to increase a competitive advantage. From these views, this study focuses on NPD strategies of Korean SMEs, and how their international orientation affects on NPD performance. In addition, this study will be showed the moderator effects of external and internal environmental factors on relationship between international orientation and performance. The findings of this study indicated that the international orientation affects on NPD performance positively. Second, the market uncertainty shows a negative moderator effect by decreasing the relationship between international orientation and NPD performance. Finally, the functional integration doesn't show a meaningful moderator effect.