• The Transactions of the Korea Information Processing Society
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• v.7 no.8S
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• pp.2620-2630
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• 2000

본 논문에서는 규칙 기반 추론 기법을 이용하여 LAN 상의 지연 장애 검출 알고리즘과 장애를 유발시킨 호스트에 대한 위치 확인 알고리즘 및 장애 원인 분석 알고리즘을 제시하고자 한다. 이를 위해 지연 장애 검출 모델과 RBR 기반 장애 검출 규칙 모델을 제시하고 있다. 또한 충돌율 검출 규칙과 이용률 검출 규칙을 적용하여 지연 장애 검출 알고리즘을 설계하였고, 최대 패킷 출력 호스트 파악 규칙을 적용하여 장애 위치 탐색 알고리즘을 설계하였다. 그리고 패킷 유형 분석 규칙과 장애 원인 파악 규칙을 적용하여 장애 원인 분석 알고리즘을 설계하였다. 이를 통하여 LAN 상의 지연 장애를 검출하고 진단하는 기법을 제시하고자 한다. 이와 같이 제시한 지연 장애 검출 및 진단 기법을 실제 네트워크 환경에 직접 적용시켜 봄으로써 본 논문에서 제시한 장애 검출 및 진단 기법의 정확성과 적용성을 확인하였다. 이러한 기법은 네트워크 관리자가 LAN 상의 장애를 진단하고 원인을 해결하는데 큰 도움을 줄 것으로 기대된다.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.5 no.2
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• pp.158-165
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• 2002

Purpose: We designed this retrospective study to establish the incidence of diagnosic delay in children diagnosed with acute appendicitis and to identify associated factors with delayed diagnosis and its impact on the clinical course. Methods: All cases of children under 15 years of age who underwent appendectomy from 1996 to 2001 at Gangneung Asan Hospital were reviewed. We reviewed signs and symptoms, type of health professional first contacted, the advice given by the health professional and a history of appendicitis in first degree relatives. Diagnostic period is the time elapsed between first complaints and definitive diagnosis. Delay was defined as diagnostic period exceeded the 48 hours. Postoperative course and complications were also reviewed. Results: Incidence of diagnostic delay differed by whether diarrhea and fecalith on X-ray were present. Also children whose parents were advised to observe them at home were more likely to have a diagnostic delay. In almost half of the cases in delayed group, initial diagnosis was not acute appendicitis but gastroenteritis. The perforation rate in non-delayed group was 22%, whereas 87% in delayed group. The delayed group showed a higher number of postoperative complication and a longer hospitalization period. Conclusions: Diarrhea with abdominal pain and fever in children should not be dismissed as gastroenteritis, respiratory infections or other common disorders. Our study suggests that physicians have a responsibility to prevent diagnostic delay and resultant perforation of acute appendicitis in children by having a high index of suspicion about acute appendicitis.

• Tuberculosis and Respiratory Diseases
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• v.45 no.4
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• pp.754-759
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• 1998

Background : Lung cancer is an important public health problem because of rapidly increasing malignancy in both sexes in relation with high smoking rate in Korea. Despite advances in therapeutic modalities and supportive cares, 5-year survival rate has improved only marginally during the past 2 decades. Therefore, the early detection of lung cancer is strongly needed for better prognosis and we conducted this study to review the clinical factors resulting in delayed diagnosis of lung cancer. Method: The clinical data such as presenting symptoms, duration for diagnosis, disease entities causing misdiagnosis or delayed diagnosis, were analyzed retrospectively in 154 patients with primary lung cancer diagnosed at Chungnam National university hospital from January to December in 1995. Results : 63 patients(40.9%) out of 154 patients were delayed diagnosed with the duration of 6.3 months compared with 3.6 months in patients diagnosed without delay. In delayed diagnosed group, Cough & sputum and dyspnea as presenting symptom were more critical than hemoptysis and chest pain, and doctor's delay was more critical than patient's delay. Tuberculosis(30/63) was most frequent disease entity causing delayed diagnosis, followed by pneumorua(9/63), COPD(6/63), heart diseases(5/63), etc.. Conclusion: It should be emphasized that any respiratory symptom be checked with chest X-ray to differentiate lung cancer and periodic check of chest X-ray be also needed for the longterm patients with any disease, especially with high risk group.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05b
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• pp.487-492
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• 1996

이 논문은 원자력발전소의 중대사고를 중지 또는 완화시키기 위하여 제시된 사고관리 방안의 실현가능성을 평가하기 위한 새로운 방법론을 소개하고 있다. 이 방법론은 사고관리 방안의 수행실패 요인으로 운전원 진단 및 의사결정 오류, 운전원 수행오류, 관련기기 실패로 인한 오류, 수행지연으로 인한 오류 등으로 나누고, 각각에 대하여 평가 방법을 제시하였다 .운전원 진단 및 의사결정 오류 평가시 고려하여야 할 주요 인자들을 제시하였으며, 수행지연으로 인한 오류 평가시에는 시스템 가용시간과 방안 수행 소요시간을 정의하고 각각에 대한 분포 획득 방법과 이를 이용한 평가 방법을 제시하였다. 제시된 방법론을 영광 3.4호기 공동범람 방안의 평가에 적용하였다.

• The Korean Journal of Nuclear Medicine
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• v.36 no.5
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• pp.306-313
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• 2002

Purpose: Diuretic renography (DR) can be false negative in patients with upper urinary tract obstruction due to low compliance of the renal pelvis. Delayed parenchymal transit (DPT) may be a valuable sign in case of false negative DR. We compared the diagnostic values of DR and DPT during Tc-99m MAG3 diuretic scan in adults with suspected unilateral obstructive uropathy. Materials and Methods: Fifty-four patients(male:female=30:24, age: $40.7{\pm}15.5$ yrs) who underwent Tc-99m MAG3 diuretic scan due to suspicious unilateral obstructive uropathy were analyzed. DR with a $T_{1/2}\;of\;>\;15min$ was considered as positive for obstruction. DPT was considered to be present when there was delayed appearance of radioactivity in the renal pelvis and prolonged retention of radioactivity in the renal parenchyma. The renal area ratio was defined as the ratio of pixel number of hydronephrotic kidney over that of normal contralateral at $1{\sim}2min$ images. Definition of obstruction was improved hydronephrosis after intervention, or aggravated hydronephrosis without intervention. Non-obstruction was defined as unchanged hydronephrosis over 6 months. Results: Twenty-six renal units had obstruction and 28 no obstruction. The sensitivities of DR and DPT were 69% (18/26) and 50% (13/26) respectively. Two renal units with DPT but negative DR showed the renal area ratio of <1.1. Among the 20 obstructive renal units with DPT or positive DR, 13 with DPT had lower renal area ratio than 7 renal units without DPT ($0.97{\pm}0.20\;vs\;1.30{\pm}0.41,\;p<0.05$). Differential renal function was not significantly different between these groups. DPT correctly diagnosed all renal units with non-obstruction (specificity 100%), while the specificity of DR was 89% (25/28). Conclusion: DPT during Tc-99m MAG3 diuretic scan may be a valuable sign in diagnosing urinary obstruction especially in patients with false negative DR and early HN.

• Journal of Veterinary Clinics
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• v.29 no.1
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• pp.78-81
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• 2012

A 5-year-old male Pointer dog weighing 24 kg was referred because of a chronic cough. The dog was routinely vaccinated and treated monthly with medications to prevent heartworm and endoparasites. Blood analyses revealed no abnormalities. Chest radiographs showed interstitial and bronchial patterns in the caudal lung fields. Bronchoscopic imaging identified a collapse of the left bronchus with a mucopurulent discharge, indicating the onset of bronchomalacia. Computed tomography also showed bronchial collapse and a tapering angle in the left caudal bronchus. This case study describes the diagnosis of bronchomalacia in a Pointer dog with a chronic cough, and suggests that bronchoscopic examination is a valuable tool for identifying of the onset of bronchomalacia in dogs presenting with an uncontrolled cough.

• Journal of The Korean Society of Inherited Metabolic disease
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• v.12 no.2
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• pp.85-93
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• 2012

Purpose: Developmental delay is caused by very diverse etiologic diseases. Most chronic disorders has some influence on development. Chronic or acute disorders of CNS are main etiologic diseases of developmental delay. Up to now, over 60 diseases are included in organic acidopathies and most of them causes acute or chronic recurrent CNS damage and developmental delay. We have done this study to find out the importance of organic acidopathies causing developmental delay in Korean childhood and adolescent patients. Method: Retrograde analysis for 738 patients with developmental delay whose clinical informations are available and have done urine organic acid analysis for 5 years period, between Jan. 1st 2007 to Dec. 31th 2011. Statistical analysis was done with Student's t test using SPSS. Result: Out of 738 patients, 340 patients (46.1%) showed abnormalities on urine organic acid analysis. The most frequent disease was mitochondrial respiratory chain disorders (MRCD) (253, 34.3%), followed by ketolytic defects(39, 5.3%), 3-hydroxyisobutyric aciduria (26, 3.5%), glutaric aciduria type II (8, 1.1%), pyruvate dehydrogenase deficiency (3, 0.4%), 3-methylglutaric aciduria (2, 0.3%), glutaric aciduria type I (2, 0.3%), ethylmalonic aciduria (1, 0.15%), methylmalonic aciduria (1, 0.15%), HMG-CoA lyase deficiency (1, 0.15%), 3-methylcrotonylglycinuria (1, 0.15%), fatty acid oxidation disorders(1, 0.15%) and FAOD (1, 0.15%). Conclusion: Mitochondrial disorders are most frequent etiologic disease on all age group, followed by ketolytic defects and various organic acidopathies. The number and diversities of organic acidopathies emphasize meticulous evaluation of basic routine laboratory examinations and organic acid analysis with initial sample on every developmental patient.

• Korea journal of population studies
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• v.18 no.1
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• pp.167-193
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• 1995

사망원인통계연보는 사망발생 당년에 신고된 사망 자료만 수록하고 있는데, 본 연구에서는 사망원인통계연보에 수록된 사망(당년신고, 또는 비지연신고)은 물론 수록되지 아니한 사망(지연신고)의 사인구조를 파악하고자 한다. 부차적으로, 사인구조를 평가하기 위해서 지연신고의 다양한 특성을 검토하고 있다. 1983년부터 1993년까지 신고된 모든 사망신고를 기초로, 지연신고와 당년신고라는 신고행태에 따라 사인별 사망구성비, 사망률, 사망률성비를 구하였다. 지연신고율이 지속적으로 감소하고 있지만, 지연신고율은 다른 집단보다 여성, 젊은층, 의사진단사망자, 병원사망자에게서 더 높다. 당년신고 사망자의 성별 사인구조와 비교해 볼 때, 지연신고 사망자의 주요 사인구조는 성별에 따라 달라지는데, 남성에게는 감염성질환, 순환기계질환, 호흡기계질환의 비중이 더 커지고, 여성에게는 감염성질환, 호흡기계질환 및 소화기계질환의 비중이 더 커진다. 1983~1993년 동안 신고된 모든 사망에 대한 주요 발견은 다음과 같다. 첫째, 순환기계질환, 악성 종양, 손상 및 중독이 남녀 모두에게 주요 3대 사인이다. 둘째, 만성 간질환, 각종 사고, 폐암, 자살은 남성에게 치명적인 사인으로서 남녀의 성별 사망력 차이를 넓혀주는 원인이다. 세째, 손상 및 중독, 특히 교통사고는 45세 이하의 젊은 층에게 중요한 사인이 되는데 반해, 순환기계질환, 악성 종양, 소화기계질환은 고령층에게 중요한 사인이 된다.

• Journal of the korean veterinary medical association
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• v.48 no.4
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• pp.244-249
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• 2012

• Journal of the korean veterinary medical association
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• v.50 no.11
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• pp.671-673
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• 2014