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폐쇄성 수면무호흡증에서의 Friedman 분류법에 대한 연구
김시환,문일준,모지훈,심우섭,이철희,민양기,이재서 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.11
Background and Objectives:In 2002, Friedman et al. suggested a clinical staging system of obstructive sleep disorder patients based on palate position, tonsil size, and body mass index. The purpose of this study was to compare the treatment outcomes of uvulopalatopharyngoplasty (UPPP) and coblation assisted uvulopalatopharyngoplasty (CAUP) according to the Friedman staging system. Subjects and Method:Fifty patients with obstructive sleep apnea who underwent UPPP or CAUP were included. Apnea index (AI), Respiratory distress index (RDI), and Body-mass index (BMI) of preoperative polysomnography were measured. The questionnaires about snoring, apnea, and Epworth sleepiness scale (ESS) were taken by the patients and their bed partners before and after operation. All patients were stratified according to the Friedman staging system. Results:Stage II patients were most common (41 cases, 82%). There was no difference in preoperative polysomnography parameters among stages. Preoperative polysomnography was decisive parameters on the determination of operative modality. UPPP was more effective than CAUP for symptom of sleep apnea with high success rate of 92.7%. Conclusion:In stage II, the success rates of sleep apnea and snoring were 80.4% and 63.4%. Though UPPP showed better success rate in treating sleep apnea, the success rate of CAUP in treating snoring was comparable to that of UPPP. CAUP is a good alternative to UPPP in treating snoring.
김시환,김성호 한국지능시스템학회 2006 한국지능시스템학회 학술발표 논문집 Vol.16 No.2
본 연구에서는 한정된 전원으로 구동되는 센서 네트워크 환경 하에서 물체의 이동을 검출하고 예측을 통해 효과적인 추적을 가능케 함으로써 missing-rate를 최소로 하는 새로운 형태의 알고리즘을 제안하고 시뮬레이션을 통해 제안된 방법의 유용성을 입증하고자 한다. 제안된 기법에서는 물체의 이동과 관련된 센서 노드들로부터의 정보 및 이를 기반으로 센서 노드에 장착된 A/D변환기의 임계값을 적응적으로 변화시킴으로써 물체의 missing-rate를 최소화 시키고자 하였다.
RTOS를 이용한 실시간 복합비례방식 자동 염소투입기 시스템 설계
김시환,인치호,Kim, Si-Hwan,Lin, Chi-Ho 한국전기전자학회 2002 전기전자학회논문지 Vol.6 No.2
본 논문은 RTOS를 이용하여 정수장의 염소투입을 실시간으로 제어할 수 있는 시스템을 제안하였다. 기존 정수장의 염소투입방식은 유량방법을 이용하여 제어하였으며 계절이나 시간 또는 물의 사용량과 같은 외부환경에 대한 적절한 제어가 불가능 하였다. 따라서 본 논문에서는 유량방법과 잔류염소방식의 2가지 방법으로 시스템을 설계하고, RTOS의 각 태스크는 외부 환경 변화를 실시간으로 체크하여 염소농도 조절에 이용되는 연산의 보정값을 조절할 수 있도록 프로그램 하였다. 제안한 시스템을 2곳의 정수장에 설치하고 설정을 1.2ppm으로 하여 실험한 결과 1.21ppm의 평균값을 유지하였으며 최대, 최소의 편차 또한 0.3ppm으로 기존 정수장보다 우수한 성능을 나타내었다. This paper proposes a method that regulate a chlorine density to real time using RTOS. The most of a cleaning bed make use of the flux method to input chlorine. But, This method is difficult to control of chlorine's amount because Amount used of water is difference in each time or according to season. In this paper, we have designed a two method to flux and remain chlorine. Each task is programmed to cope with changeable external environment. The efficiency of the proposed system is shown by comparison results for performance of the proposal system with cleaning bed using a flux method.
김시환,모지훈,황찬호,김인상,이철희,이재서,민양기 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.4
Background and Objectives:Isolated lesions of the sphenoid sinus are a rare disease entity that occurs after a wide use ofantibiotics. This lesion may have severe complications such as cranial nerve palsies due to its deep location in the skull. The useof endoscopic surgery for the sphenoid sinus has become popular for its several advantages. We report our experiences of 56case-isolated sphenoid lesions with a review of articles. Subjects and Method:Fifty-six patients with isolated sphenoidlesions who were treated at Seoul National University Hospital from January 1985 through December 2003 were analyzed.Patients who have lesions confined to the sphenoid sinus on radiologic images (CT or MRI) were included. A retrospectivechart review was performed with respect to the patients symptom, pathology and surgical outcome. Results:Thirty-nine of 56cases were inflammatory lesions, 8 neoplastic lesions, and 9 fibrous dysplasias. Headache was the most common symptom(66%), followed by nasal symptoms such as nasal obstruction and postnasal drip. Ophthalmologic symptoms were observed in14 cases. Endoscopic transnasal sphenoidotomy was perforemd in 33 of 39 cases of inflammatory diseases. Symptoms werecompletely improved in 32 cases after the operation and ophthalmologic symptoms were nearly all improved in all cases.Conclusion:The wide use of CT and MRI has increased the detection of isolated lesions of the sphenoid sinus. Complicationslike cranial nerve palsies were uncommon unlike from the reports that came out in the country. Primary physicians must rule outisolated lesions of the sphenoid to account for intractable headaches.