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안철훈 경복대학 2004 京福論叢 Vol.8 No.-
빛의 파동성과 굴절, 그리고 빛에너지의 증폭성 등의 빛이 가지는 성질을 다양하게 응용한 광기술제품은 다양한 상업적 응용에 활용되고 있다. 반도체 레이저가 개발된 이후 이러한 광기술을 토대로 디지털 통신 및 산업용 마킹 또는 용접기의 급격한 수요 증가에 따라 국내에서도 레이저 다이오드의 수요가 급증하고 있다. 이러한 추세에 따라 국내에서도 각 연구소 및 다수의 광통신 모듈업체가 레이저 다이오드 개발을 추진 중에 있고 여기서 제작한 레이저 다이오드의 신뢰성 및 수명 테스트에 필요한 레이저 다이오드 드라이버의 필요성도 함께 증가하고 있다. 그러나 국내에서는 이 장비가 개발되어 있지 않기 때문에 외국산장비를 수입하여 사용하고 있는 실정이다. 현재 연속모드 제품은 주로 고출력 레이저에 사용되고 있고, 이것 역시 외국산이 주로 사용되고 있다. 따라서 고출력, 고속의 레이저 다이오드의 출력을 시험할 수 있는 장비의 개발이 시급한 실정이다. 본 논문에서 설계, 제작한 펄스 모드 레이저 드라이버는 레이저 다이오드의 발광, 실험, 평가 및 일반 산업용 레이저에 부품으로 사용할 수 있는 레이저 구동장치이다. 이번에 국산화장비로 개발된 본 제품은 정밀, 고속 스위칭을 실현할 수 있으며 향후 외국산 제품에 수입대체 효과가 적극 기여될 것으로 전망된다. A range of photonics products using the properties of light such as wave, refraction, amplification in a diverse manner are being utilized in commercial applications. As demand for digital communications, industrial marking and welding machine is sharply increasing on the basis of such photonics since semicon- ductor laser was developed, demand for laser diode is rapidly increasing in Korea, as well. According to this trend, domestic research institutes and optical communication module manufacturers are promoting laser diode development, and the reliability of such manu- factured laser diode as well as the need for laser diode driver necessary for life test are increasing however, it has not been developed in Korea yet so it is depending upon import product. Current products of sequential mode are mainly used in high output laser, but they are made in foreign countries, too. Therefore. development of testing equipment for laser diode with higher output and speed is urgently required of us. The pulse mode laser driver designed and made in this study is a laser driving unit available both as light emitting, experiment and evaluation of diode and a component for general industrial laser. This product developed this time as localized equipment implements precision and high-speed switching and is expected to positively contribute to substituting for foreign products.
오류 수정 시간을 고려한 소프트웨어 최적 출시 시점 결정 연구
안철훈 한국소프트웨어감정평가학회 2020 한국소프트웨어감정평가학회 논문지 Vol.16 No.2
In this paper, the problem of determining the optimal time to market of software was studied using error correction time, an indicator of error correction difficulty. In particular, it was intended to modify the assumption that error detection time and correction time are independent in the software reliability growth model considering the existing error correction time, and to establish a general framework model that expresses the correlation between error detection time and correction time to determine when the software will be released. The results showed that it was important from an economic perspective to detect errors that took time to correct early in the test. It was concluded that it was very important to analyze the correlation between error detection time and error correction time in determining when to release the optimal software.
노방수,안철훈,감형식,조건국,이민형,오현관 ( Bang Soo Rho,Cheol Hoon Ahn,Hyung Sik Kim,Kun Kook Cho,Min Hyung Lee,Hyun Kwan Oh ) 대한소화기학회 1981 대한소화기학회지 Vol.13 No.1
A clinical observation was performed on 80 cases of amebic liver abscess admitted to Chosun University Hospital from March 1975, to August 1979. The results were as follows: 1. The most cases were found between the fourth and sixth decade and the incidence of peak age was in the fifth(30.0%). The male to female ratio was 3.4: 1 with male predominance. The disease occurred more frequently in the summer and the autumn, but less in the w inter. The most frequent complaint was pain(96. 3%), especially in right upper quadrant of the abdomen(72. 7%), and the most frequent physical finding was tenderness on right upper quadrant of the abdomen(97.5%). 4, The anemia below 10, Qgm% of hemoglobin was seen in 28. 7/o of patients and the leukocytosis over IO, QQQ/mm in 61. 3%. 5 Among the liver function tests, Serum total bilirubin over 3. 0 mg% was seen in 1I. 3% of patients, serum Alkaline Phosphatase over 5.0 Bodansky Units in 63. 8%, SGOT over 49 Units in 48. 8%, serum total protein below 6. 0 gm% in 20, 0%, serum Albumin below 3 0 gm% in 38, 8% and reversed A/G ratio of serum protein in 47. 5% of the patients. 6 The abnormal chest X-ray findings were seen in 66. 3% of patients and the most frequent abnormal finding was right hemidiaphragm elevation(47,5%). 7 The various complications of amebic liver abscess were found in 15% of patients and bronchopleural fistula, peritonitis, pyothorax and subphrenic abscess were seen in order of frequency. As a result of study by using of liver scanning(Au), the frequent sites of involvement were in order of posterosuperior lateral part, anterosuperior lateral part, and posteroinferior lateral part of the right lobe. G. The serial scanographic examinations during the medical treatment were performed on 7 cases, the cold areas were disappeared within a period of 2 to 6 months(average: 16.3, weeks).
복수를 동반한 간경변증에서의 혈청 Aldosterone 치 및 전해질 변동에 관한 연구
오현관(Hyun Kwan Oh),문재선(Jae Sun Moon),이철원(Chul Won Lee),안철훈(Chul Hun Ahn),홍찬표(Chan Pyo Hong),송현곤(Hyun Kon Song),양성훈(Seong Hun Yang) 대한소화기학회 1981 대한소화기학회지 Vol.13 No.2
N/A This study was performed to evaluate the concentration of serum aldosterone and electrolytes of both serum and 24hours urine in 10 normal healthy subjects and 15 patients of liver cirrhosis with ascites who had been admitted to Chosun University Hospital during the periocd from July 1979 to June 1980. The results were briefly summerized as follows. Serum aldosterone level was incrensed significantly in patients with liver cirrhosis (p<0.05). 2. Serum Na level and excretion of Na in 24 hours urine were decreased significantly in patients with liver cirrhosis (p<0.05). 3. There was no signigicant difference in serum K level and excretion of K in 4 hours urine between normal subjects and patients with liver cirrhosis. 4. Of 15 patients with liver cirrhosis, 10 cases (67%) showed higher level of serum aldosterone than nomal and 5 cases (33%) showed normal level 5. Both serum Na level and excretion of Na in 24hours urine were decreased significaatly in cirrhotic patients with higher aldosterone group than normal aldosterone group (p<0.025), but there was no significant difference in serum K level and excretion of K in 24hours urine between cirrhotic patients with higher aldosterone group and normal aldosterone gorup.