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하이브리드 지식표현을 이용한 선박엔진 고장진단시스템의 개발에 관한 연구
최욱현,소명옥,하창승,류길수 한국전문가시스템학회 1998 학술대회 Vol.2 No.1
This paper presents the design and implementation of ship engine diagnosis system using hybrid knowledge representation method and certainty-factor rule-base. The Monitoring system of ship engine room gets measuring data in real-time from distributed local units, processes, displays an CRT and saves them in the database. The alarm management function checks the alarm state of the monitoring data. If the alarm occurs, it displays on CRT and saves at database. This ship engine diagnosis system uses this monitoring data and alarm data to diagnosis data. The knowledge representation is used object-oriented knowledge representation method. The diagnosis data and abnormal states are represented each objects and abstracted class of diagnosis data and class of abnormal state. We use object-oriented concepts that are abject hierarchical structure, inheritance, method, pattern matching etc. then we can construct knowledge-base effectively. We use certainty-factor method for handling uncertainties of evidence and rule. The certainty-factor rule-base is developed using pattern matching and method that is attached at each abnormal state objects.
2세 미만의 열성 환아에서 소변 주머니를 이용한 소변 배양 검사의 오염률에 영향을 미치는 인자
최욱현,임인석 대한소아청소년과학회 2009 Clinical and Experimental Pediatrics (CEP) Vol.52 No.3
Purpose : Since children under two years with suspected urinary tract infections (UTIs) cannot control urination, urine cultures in such children are usually performed via urine bags. This method is noninvasive but has a high contamination rate. We studied the contamination rate of bag urine culture in diagnosing UTI in infants under two years and the factors responsible for contamination. Methods : We examined patients under 2 years in whom urine culture through the urine bag method yielded over 105 colonies of a single pathogen. We defined UTI by referring to the guidelines of The Korean Society of Pediatric Nephrology, 2005. We examined the factors responsible for contamination according to sex, duration of urine collection, and whether diarrhea took place with contamination rate. Results : We examined 717 patients (412 males and 305 females). The contamination rate of one bag urine culture was 37.9%. Gender was not related to the contamination rate (P>0.05). Duration of urine collection showed an association with the contamination rate. The longer the duration of collecting urine, the higher was the contamination rate. Duration of urine collection was divided into three groups: first group, 02 hours; second group, 24 hours; and third group, >4 hours. Contamination rates were 30.0%, 42.2%, and 43.7% for the first, second, and third groups, respectively, with statistical significance (P=0.001). Diarrhea at admission had no impact on the contamination rate (P>0.05). Conclusion : The contamination rate of urine culture in the examined patients was 37.9%. Gender and diarrhea symptoms were not responsible for contamination. In infants with a suspected UTI, urine should be collected within 2 hours through the urine bag method. If urine collection takes >2 hours, the urine bag should be resterilized and reattached to the patient. 목 적 : 요로 감염이 의심되는 2세 미만의 소아는 소변을 가릴 수 없기 때문에, 일반적으로 소변 주머니를 이용하여 소변 검사를 시행한다. 이 검사 방법은 비칩습적인 검사이지만 오염률이 높은 단점이 있다. 이에 저자들은 소변 주머니를 이용한 소변 배양 검사의 오염률에 영향을 미칠 수 있는 인자들에 대하여 알아보았다. 방 법 : 2007년 1월부터 2007년 9월까지 중앙대학교병원 소아청소년과에 내원한 환아들 중 소변 주머니를 이용한 소변 배양 검사에서 단일균이 10만개 이상 자란 환아들을 대상으로 하였다. 소변 주머니를 재부착하였던 환아들을 제외하고, 요로 감염인 환아와 오염인 환아로 분류하여, 환아의 성별, 소변 주머니를 붙인 뒤 채취에 걸린 시간, 설사 증상의 동반 유무가 오염률에 어떤 영향을 미치는지 조사하였다. 결 과 : 872명 중에서717명의 환아가 연구에 포함되었고 환아이들 중 중 남아는 412명, 여아는 305명이었다. 37.9%의 오염률을 보였고, 성별과 오염률은 통계학적으로 유의한 차이가 없었다 (P>0.05). 소변 주머니를 붙인 뒤 소변 채취에 걸린 시간이 길어질수록 오염률이 증가하였고, 2시간 이내, 4시간 이내, 4시간 이상 10시간 이내로 세 군으로 나누어 오염률을 확인하였을 때 각각 30.0%, 42.2%, 43.7%로 통계학적으로 유의하게 증가하는 것으로 나타났다(P=0.001). 내원 당시 설사 증상의 동반 여부는 배양 검사의 오염률에 영향을 미치지 않았다(P>0.05). 결 론 : 성별 및 설사 증상 유무는 소변 주머니를 이용한 소변 배양 검사의 결과에 영향을 주지 않으며, 요로 감염이 의심되는 2세 미만의 환아에게서 2시간 이내에 소변 채취시에는 정확도를 높일 수 있다. 따라서 소변 주머니를 붙인 뒤 2시간 이상 경과된 환아에게서 독성 증상이 없다면 재소독 후 재부착을 실시하는 것이 오염률을 줄이는데 도움이 될 것으로 보인다.
출생 직후 상부 기도 폐쇄를 일으킨 비인강 기형종 1례
최욱현 ( Wook Hyun Choi ),김지현 ( Ji Hyun Kim ),이재희 ( Jae Hee Lee ),이정주 ( Jung Ju Lee ),윤신원 ( Sin Weon Yun ),채수안 ( Soo Ahn Chae ),임인석 ( In Seok Lim ),이동근 ( Dong Keun Lee ),최응상 ( Eung Sang Choi ),유병훈 ( Byou 대한주산의학회 2008 Perinatology Vol.19 No.4
Teratoma originate from one or more germ cell layer and commonly arise from sacrococcygeal area in neonate. Teratoma arising from the oropharyngeal cavity is called epignathus tumor and is extremely rare in neonate. Clinical manifestation of epignathus tumor vary from asymptomatic to severe respiratory distress symptom. It is reported that most of the tumor are benign in nature. Large teratoma can be diagnosed by prenatal ultrasonography, but most cases were diagnosed with computed tomography or magnetic resonance image after birth. Prognosis is determined by the need for neonatal resuscitation for respiratory distress at the time of birth and the extent of tumor, involving large vessles, skull base or communication with the brain. We experienced a case of epignathus tumor in a neonate with severe respiratory distress immediately after birth, so that reported with review of the literature.
국내건설업체의 해외수주현황 분석을 통한 전략 수립과 국제경쟁력 향상 방안
한충희,최욱현 경희대학교 산학협력기술연구원 2005 산학협력기술연구논문집 Vol.11 No.4
The construction companies are still unstable even though the financial structures of the construction companies were stablized due to the prosperity of the real estate market in recent 2 to 3 years. Most construction companies have concentrated on the housing market and the major construction companies put their efforts on that market in the rate of 30 to 50 percent of their whole projects. At this moment the demand of housing construction is seriously decreasing and unlot-houses are increasing. However overseas large scale construction demands are increasing. Therefore, construction companies have to be competitive to win in the international construction market. In other words, the competitiveness in the global market depends on how many projects Korean construction companies get. Therefore, construction companies have to be well equipped with general construction management system along with engineering and risk management capacity. In this research, the trend of overseas construction market is firstly studied. This research further suggests how construction companies can be competitive through enhancing the engineering capability.
수장측 잠김 금속판을 이용한 관절 내 원위 요골 골절의치료 중 발생한 원위 잠김 나사 파손
이수건,이상호,최욱현 대한수부외과학회 2013 대한수부외과학회지 Vol.18 No.4
Distal radius fracture is one of the most common fractures treated in the orthopedic field. The application of locking plate principle to the distal radius has allowed comminuted distal radius fractures involving the articular surface to be effectively treated by open reduction and internal fixation. The authors experienced a case of failure of distal locking screws in an intraarticular distal radius fracture treated with volar locking plate fixation. 원위 요골 골절은 정형외과에서 치료하는 가장 흔한 골절 중 하나로 잠김 금속판의 원리가 원위 요골 골절 고정용 금속판까지 적용됨으로써 관절면을 침범한 분쇄 골절도 수술적 치료를 통하여 효과적인 고정을 얻을 수 있게 되었다. 저자들은 원위 요골 골절 정복에 있어서 구조적 안정성을 제공하는 잠김 금속판 고정 치료 후 발생한 원위 잠김 나사의 파손을 경험하였기에 보고하고자 한다.
선박 기관실 실시간 모니터링 시스템의 HMI 구현에 관한 연구
정경열(K.Y.Chung),최욱현(W.H.Choi),류길수(K.S.Rhyu) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
In this paper, the design and implementation of HMI for a real-time monitoring system of ship engine room is presented. The monitoring system gets sensor data of real-time from distributed local units after processing data, displays at CRT and saves in the database. The proposed system consists of four modules, the data management module, the alarm management module, the user interaction module, and the display module. The data management module transfers raw data from a device to engineering data. The alarm management module checks the alarm status of data received from local units. If the alarm occurs, data are displayed at CRT and saved at database.