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허문열,송광렬,강두석 성균관대학교 응용통계연구소 2002 통계연구 Vol.10 No.-
이 논문에서는 군집분석을 위한 알고리즘을 JAVA로 구현하였다. 여기에서 구현한 군집분석 방법들은 5가지로서 K-Means, K-Medoids, EM, Cobweb, 그리고 Divisive 방법이다. 군집분석의 구현결과는 실제 자료를 사용하여 DAVIS와 F통계량을 통해 각 방법의 효율성을 평가하였다. 실증분석에서는 물고기와 빈곤-불평등 두 개의 실제 자료들을 사용하였다. In this paper, we implement several clustering algorithms and evaluate their efficiencies. The methods are K-means, K-medoids, EM, Cobweb and Divisive methods. We use DAVIS for visual evaluation and use F-statistic for analytical evaluation. For empirical study, three real data sets are considered. They are fish, credit card and poverty-inequality data sets. The tools for visual evaluation from DAVIS are Scatter Plot matrix, Dendrogram, Parallel Coordinate and Grand Touring. The analytical evaluation is done using the plane F-statistic which is the ratio of between-groups variance to within-groups variance.
폐혈증성 색전에 의한 폐동맥 색전증시 하대정맥 결찰 1예
권굉보,서보양,송광렬 대한혈관외과학회 1990 Vascular Specialist International Vol.6 No.1
The most serious complication of venous thrombosis is pulmonary embolism. Septic emboli unresponsive to antibiotic and anticoagulant therapy pose a significant threat to life. Complete ligation of the inferior vena cava is now a relatively uncommon procedure. It causes an acute decrease in venous return to the heart, and the associated hemodynamic consequences result in a significant operative mortality rate. It entails also a greater likehood of postoperative sequelae. Recently authors experienced a case of successful result after inferior vena caval ligation of septic pulmonary embolism. 47 years old female patient complained of painful swelling on right leg with fever due to Moxa cautery for 4 weeks. Dyspnea, chest pain and hemoptysis have developed since 5 days ago. Laboratory findings were WBC 16,600/mm³, Pa0₂,65.2mmHg, PaCO₂,35mmHg, SGOT 53 IU/L, LDH 329 IU/L and bilirubin 2.2mg/dl. The diagnosis was established with impedance plethysmography, B-mode duplex scan, venography, perfusion lung scan and pulmonary arteriography. After complete vena caval ligation, systemic anticoagulant and antibiotic therapy had continued. Patient was recovered without any significant sequelae after 2 weeks. In conclusion, complete vena caval ligation may induce more operative mortality and postoperative sequelae than plication. In case of septic pulmonary emboli, early ligation will prevent further disastrous results.
김영춘(Young-Chun Kim),이명화(Myung-Hwa Lee),송광렬(Kwang-Ryeol Song) 한국관세학회 2004 관세학회지 Vol.5 No.2
This study is to analyse the problems fo trade statistics and to enhancement of its the quality. The present state level of the quality of trade statistics has the problems of insufficiency in the preventive control system of quality, in the exposition control system in the process of disposal and in the subsequent correction control system of the service. The construction of system ensuring the quality of statistics is needed to achieve the high quality level, the promotion of confidence level of trade statistics through automation of minimizing system of errors. The trade statistics should be needed to be utilized as basic informations for trade policies, researches and economic activities of the public through standardization and coding of commodity names and specifications to gain the diversity in service of trade statistics.