원전 고등제어 알고리즘 설계를 위한 소규모 시뮬레이터 개발

나만균,심영록,신선호,노희천 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2

There has been a difficulty in implementing control algorithms (including even proportional-integral-derivative control algorithms) designed to verify and test to many small-scale simulators. In particular, it was almost impossible to implement advanced control algorithms to them. Therefore, it is required to develop a new simulator that facilitates the implementation of advanced control algorithms and the interface between different kinds of application programs. The objective of this work is to improve the existing small-scale simulator (FISA-2/WS) for the Kori unit 2 nuclear power plant and thus enable advanced control algorithms to be tested and verified by being applied to it. The developed simulator consists of FORTRAN, Visual C++, and MATLAB programs and an advanced control method using a receding horizon control method was applied to it to control the steam generator water level.

두부방사선사진의 계측오류에 관한 연구

나광천,윤영주,김광원 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.1

본 연구는 교정 치료를 위한 진단과 치료 계획의 수립에 널리 이용되는 진단 수단의 하나인 두부 방사선 사진을 계측하는 연구에서 볼 수 있는 오류의 중요성을 인식하고, 반복 계측의 방법으로 체계적 오차(systematic error)를 찾아내고 임의적오차(random error)의 범위를 산출하는 과정을 통해 기준점의 식별에 보다 주의가 기울여져야 할 해부학적 기준점들을 찾아보고자 시행되었는데, 통법에 의해 촬영된 100장의 측모 두부 방사선 산진을 연구대상으로 하여 61개의 기준점과 130개의 계측항목을 선정하였고 반복계측을 위해 25개의 표본을 무작위로 선정, 계측오차를 분석하여 다음과 같은 결론을 얻었다. 1. 반복계측에 따른 계측치의 비교에서 130개 전체 계측항목의 18.4%인 24개 항목에서 유의성 있는 차이를 보였다. 2. 반복계측에서 기준점 식별에 차이를 보이는 빈도는 상악 전치의 치근단점(as), 상악골의 최후방벽(tu), 연조직 nasion과 전두정(ft) 그리고 기도의 ad3점에서 매우 높았다. 3. 5%이하의 유의도를 보이는 수준까지 기준점 마킹을 수정한 후, 임의적 오차의 범위는 0.67-1.71mm 또는 도를 보였다. 4. 가장 임의적 오차를 보인 계측항목은 상, 하악 전치가 이루는 각(interincisal angle; ILs-ILi)이었다. 5. 계측오차의 문제는 주로 해부학적 정의에 대한 정확성의 부족과 불분명한 방사선사진상에 기인되었다. 이상의 연구 결과로 두부 방사선 사진의 계측에는 많은 오류의 가능성이 있음을 확인할 수 있었고 이에 따라 두부 방사선 계측에서 뿐 아니라 계측이 이루어지는 모든 연구에서는 항상 계측오류에 대한 분석이 함께 이루어져야 할 것이며, 조사자로서 뿐만 아니라 다른 연구자의 연구결과를 올바르게 인식하기 위한 목적으로도 오류에 대한 인식은 필수적인 것으로 생각된다. This study was done to recognize the importance of errors in measurements of cephalometric rediograph and to find the anatomical structures those need special care to select as a reference points through the detection of the systematic errors and estimation of random errors. For this purpose, 100 cephalometric radiographs were prepared by usual manner and 61 reference points, and 130 measurement variables were established. Measurement errors were detected and estimated by the comparison of the 25 randomly-selected samples for repeated measurements with the main sample. The following results were obtained: 1. In comparison of the repeated measurements, there were statistical significant differences in 24 variables which were 18.4% of 130 total variable. 2. The frequency of the difference in identification of the reference points between the repeated measurements was very high in the root apex of upper incisor(as), the most posterior wall of maxilla(tu), soft tissue nasion(n'), soft tissue frontal eminence(ft), and ad3 in airway. 3. After correction of reference points marking until the level of below 5% significance, the range of random errors were from 0.67 to 1.71 degree or mm. 4. The variable shown the largest random error was the interincisal angle(ILs-ILi). 5. Measurement errors were mainly caused by the lack of precision in anatomic definitions and obscure radiographic image. From the above results, the author could find the high possibility of errors in cephalometric measurements and form this point, we should include error analysis in all the studies concerning measurements. In is essential to have a concept of error analysis not only for the investigator but also for a reader of other articles.

대퇴부의 지역 차단 마취후 광범위 피부 이식 공여부의 임상적 고찰

나영천,류봉수,강양수,양정열,임홍철 大韓成形外科學會 1998 Archives of Plastic Surgery Vol.25 No.3

In general, split thickness skin graft was done under general anesthesia. However, there was a difficulty to do general anesthesia in some cases due to poor general condition. The lateral cutaneous nerve block of the thigh(LCNBT) anesthesia the usual donor site of split-thickness skin graft in the thigh. Using 10 ㎖ of 0.5% bupivacaine, LCNBT was used thigh for harvesting split-thickness skin in 42 patients. Patients age ranged from 18 to 62 years with mean 49 years. The onset of full anesthesia took between 12 and 21 minutes. The area anesthetised ranged from 200 ㎠ to 940 ㎠ with mean 551 ㎠. The duration of full anesthesia was from 6 to 16 hours. In 6 patients, LCNBT was compared with previous lidocaine local anesthesia and all patients preferred to do LCNBT. In our experience, LCNBT is a safe, and simple method for harvesting split-thickness from the thigh and LCNBT provided good postoperative analgesia.

근대 스포츠기록의 형태와 특성에 관한 고찰

천호준,인상우,나영일 서울대학교 스포츠과학연구소 2007 스포츠과학리뷰 Vol.1 No.1

The purpose of this study is to review the type and feature of sport records in the time when sport was introduced in Korea in order to provide thoughtful issues in utilizing and managing sport archives. At the outset of the modern era, Korean sport have developed tremendously both in quality and quantity by the induction of western sport. Thus the western sport have brought in the scientific technology to record sport results, moreover, promoting sport recording techniques and information delivering methods. Sport records in the modern era has displayed in different ways and characteristics compared from the earlier ones in the past. First of all, the introduction of modern day form of sport games and results were shown for the first time, and by establishing sport related committees and organizations the recordings for the administration of these groups have emerged. Secondly, being supported by the development of technology media have emerged allowing information created by newspapers and various broadcasting systems to be recorded not only by recording information from the documentary records. Thirdly, the pool of information to be recorded have expanded and the modern day social infrastructure have improved the variety of sport recording producers. In order to be successful in efficient sport archives management for the modern sport in Korea, analyzing the feature of archiving forms and characteristics of sport records and the proper methods must be applied based on the clear understanding of Korea modern sport era.

클레임 조기경보 시스템에서 AHP 분석 기반 신경망 등급 결정

나종수,이영천 호남대학교 정보통신연구소 2006 정보통신연구 Vol.16 No.-

Most companies maintain warranty databases for purposes of financial reporting and warranty expense forecasting. In some cases, there are attempts to extract engineering information from such databases. Another important application is to use warranty data to detect potentially serious field reliability problems as early as possible. When a serious problem arises, the existence of the problem will eventually be obvious. Early detection of serious problems through the use of sensitive statistical methods, allowing early action to mitigate potential reliability problems, could save large amounts of money and product good will. This paper describes a detection procedure that has been designed for this purpose. In addition to the AHP analysis, we suggest an neural network model for illustrating and describing the particular information in the data that caused the potential problem to be flagged. The methods are illustrated using data from an automobile warranty database.

결장직장암 환자의 임상적 고찰 : 조선대학교 부속병원의 10년 간의 결과

나은종,문성표,장정환,김권천,민영돈,김성환,조현진,김정용,김경종 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.2

Background and Objectives: The colorectal cancer rates 4th in the total cancer prevalence in Korea. The clinical patient demographics were considered with the incidence rate of the colon and rectal cancer. The clinicopathological factors were analyzed for the 5 year survival rate. Materials Methods: Of the 282 patients who were operated from Jan. 1, 1992 to Dec. 31, 2001 and diagnosed by pathological biopsy as colo-rectal cancer, 234 patients were followed up. The age, sex, location of the cancer, TNM stage, operation method, histopathological classification, metastatic region, complications after operation and the survival rate were investigated. Results: Of the 234 patients, male and female consisted of 120 cases (51.3%) and 114 cases (46.7%), with an average age of 61.6 years. The average follow up period was 52.3 months and the peri operative mortality was 5.6%. The site of the cancer was most frequent at the rectum with 127 cases (54.3%). The patients were classified according to the TNM stages with 38 cases of stage 1 (16.2%), 98 cases of II (41.9%), 72 cases of III (30.8%) and 26 cases of IV (11.1%). The 5 year survival rate in the age group older than 50 was 63.3 % and 73.5% in the group younger than 50. In regard to the operation type, the 5 year survival rate was 65.4% for elective operation and 65.8% for emergency operation. The 5 year survival rate for well differentiated, moderately differentiated, poorly differentiated cancer, and mucinous adenocarcinoma was 73.7%, 60.2%, 58.3%, and 92.6%, respectively. The 5 year survival rate of each of the TNM stage is 81.1%, 74.8%, 57.0%, and 11.5% for Classes I, II, III, and IV, respectively. Conclusion: The clinical factors were analyzed for the 5 year survival rate with no statistical significance for the age, sex, and location of the cancer. The TNM stage and histopathological differentiation were statistically significant. The colon cancer showed better prognosis compared to the rectal cancer.

보리순의 영양성분 조성

서혜지,최용민,김상천,이준수,이기택,정명근,천지연,황진봉,남진식,서우덕,황영,김행란,김세나 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2

귓바퀴에 발생한 켈로이드 치험 1례

모재성,나영천 圓光大學校 醫科學硏究所 2006 圓光醫科學 Vol.21 No.1

메치실린 내성 황식 포도상구균(MRSA)에 대한 소독제 및 항생제의 살균력 효능

이희중,나영천,유석근,김동철,김신무 大韓成形外科學會 2002 Archives of Plastic Surgery Vol.29 No.6

메치실린 내성 황색 포도상구균(MRSA)에 대한 소독제 및 항생제의 살균력 효능

이화중,나영천,유석근,김동철,김신무 大韓成形外科學會 2002 Archives of Plastic Surgery Vol.29 No.6