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강진범(Jinbeom Kang),양재영(JaeYoung Yang),최중민(Joongmin Choi) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
효과적인 문서 분류를 위해 학습 하고자 하는 클래스와 관련된 많은 특징들이 필요하다. 하지만 학습하고자 하는 개념과 관련이 없거나 중복된 정보가 수집된 정보 속에 존재한다. 학습 과정에서 정확한 지식습득을 하기 위해 특징 선택 방법을 사용하였다. 본 논문에서는 클래스에 대한 단어의 불순도를 이용한 특징 선택 방법을 제안한다. 기존의 특징 선택 방법과 비교 분석하여 기존 특징 선택 방법의 문제점을 파악하고 개선된 기법을 보인다.
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문서의 불균등 분포를 고려한 단어 불순도 기반 특징 선택 방법
강진범(Jinbeom Kang),양재영(Jaeyoung Yang),최중민(Joongmin Choi) 한국정보과학회 2007 정보과학회논문지 : 소프트웨어 및 응용 Vol.34 No.9
기계 학습 과정에서 수집된 많은 정보들 중에는 학습하고자 하는 개념과 관련이 없거나 중복된 정보를 가진 경우가 많다. 또한 자료 자체에 오류가 있기도 하다. 이와 같이 학습 모델 생성을 위해 수집된 정보를 신뢰할 수 없다면, 학습 과정에서도 정확한 지식 습득이 어렵다. 그래서 기계 학습은 학습 과정에서 정확한 지식 습득을 위해 특징 선택 방법을 사용한다. 특징 선택은 학습할 클래스와 관련이 없거나 중복된 정보를 학습 모델 생성 이전에 제거함으로써 학습 알고리즘의 성능을 향상시킨다. 기존의 특징 선택 방법들은 적절한 특징을 선택하기 위하여 문서가 균등하게 분포되어 있다고 가정한다. 하지만, 실제로는 그렇지 않으며, 문서의 수 또는 문서의 길이가 모두 동일한 학습 예제를 준비하는 것도 매우 어렵다. 본 논문에서는 보다 효율적으로 특징을 선택하기 위해 클래스 별 단어의 불순도와 문서의 불균등 분포를 고려한 특징 선택 방법을 제안한다. 클래스를 대표할 수 있는 특징 후보들을 단어의 불순도 측정을 통해 얻고, 문서의 불균등 분포를 고려하여 특징을 선택한다. 실험을 통해 보다 좋은 성능을 보임을 입증한다. Sample training data for machine learning often contain irrelevant information or redundant concept. It is also the case that the original data may include noise. If the information collected for constructing learning model is not reliable, it is difficult to obtain accurate information. So the system attempts to find relations or regulations between features and categories in the learning phase. The feature selection is to remove irrelevant or redundant information before constructing learning model. for improving its performance. Existing feature selection methods assume that the distribution of documents is balanced in terms of the number of documents for each class and the length of each document. In practice, however, it is difficult not only to prepare a set of documents with almost equal length, but also to define a number of classes with fixed number of document elements. In this paper, we propose a new feature selection method that considers the impurities among the words and unbalanced distribution of documents in categories. We could obtain feature candidates using the word impurity and eventually select the features through unbalanced distribution of documents. We demonstrate that our method performs better than other existing methods via some experiments.
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조성범,김동원,강진무,우영훈,김명성,김흥식 啓明大學校 醫科大學 1993 계명의대학술지 Vol.12 No.4
The analysis of the clinical and radiological findings were performed on 41 cases of brain tumor in children under the age of 15 years who were admitted to Pediatric department of Dongsan Medical Center,Keimyung University, School of Medicine between May 1987 and September 1992. The clinical and rediological findings were analysed retrospectively. The results were as follows : The male to female ratio was 2.7 : 1 and the peak incidence of age was between 10 and15 years(39.0%). The supratentorial tumors were found more frequently(60.9%) than the infratentorial tumors(39.1%). Histopathologically, the astrocytoma was most common(24.4%), followed by medulloblastoma, ependymoma, craniopharyngioma. The main symptoms of the supratentorial tumors were headache(64.0%), vomiting(56.0%), nausea(44.0%),visual disturbance(32.o%), convulsion(24.0%), and endocrine dysfunction(8.0%), in order of frequency. Those of the infratentorial tumors were vomiting(87.5%), nausea(75.0%), headache(62.5%),papilledema(37.5%), ataxia(25.0%), convulsion(18.8%). The brain CT findings were different according to the histopathological findings. Most of the astrocytoma showed cystic nature, low density, and inhomogenous enhancement. Medulloblastoma was mostly located at infratentorium, and showed well enhancement and hydrocephalus in all cases. Craniopharyngioma showed suprasella hypodensed mass lesions with calcificaion in all cases. Ependymoma showed well enhancement and marked hydrocephalus in cases. 40 cases except one case of metastatic ganglioneuroblastoma had undergone complete or partial resection. Twelve patients were irradiated and 3 patients received chemotherapy after surgery. Eight patients received combind therapy with surgery, radiotherapy and chemotherapy. Out of 40 cases who received surgery, the follow up study was possible on 24 cases of which 11 cases have been alive, including 5 cases who has been survive more than 2 years.
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강진무,김흥식,조성범 대한감염학회 1994 감염 Vol.26 No.2
동산의료원 소아과에 입원치료하였던 중증세균성감염환아 72명(폐렴 17명, 농흉 15명, 패혈증 10명, 뇌막염 18명, 급성골수염 12명)을 대상으로 하여 혈소판을 측정하고 세균감염과 혈소판증가와의 관련성을 관찰하여 다음과 같은 결과를 얻었다. 탈장수술을 위해 입원한 환아 30명을 대조군으로 하였다. 72명중 혈소판 최고치가 450×10³/㎕이상인 경우는 59명(81.9%)이었다. 폐렴 70.6%, 농흉 93.3%, 패혈증 70.0%, 뇌막염 77.8%, 골수염 100.0%에서 혈소판증가를 볼 수 있었다. 혈소판이 600×10³/㎕이상인 심한 증가는 51.4%에서 볼 수 있었고 농흉(86.7%), 급성골수염(83.3%)등에서 많았다. 혈소판 최고치의 평균은 중증감염중에서 615.5±183.37×10³/㎕로 대조군 336.5±80.72×10³/㎕보다 유의하게 높았으며 급성골수염 759.7±147.44×10³/㎕, 농흉 691.9±152.04×10³/㎕, 뇌막염 599.7±203.65×10?/㎕, 폐렴 527.9±145.26×10³/㎕, 폐혈증 505.3±144.84×10³/㎕의 순이었으며 모든 질병군에서 대조군보다 유의하게 높았다. 혈소판이 최고치에 도달하는 평균일수는 질병에 따라 7.1±3.95~10.9±6.52일이었으며 정상으로 돌아오는 일수는 14.8±4.70~24.3±5.58이었다. 혈소판과 혈색소, 백혈수, 혈침 사이에는 유의한 상관관계는 없었다. 중증세균성감염증의 81.9%에서 혈소판 증가를 볼 수 있었으며 특히 국소에 농의 축적을 초래하는 급성골수염과 농흉에서 심한 혈소판 증가를 볼 수 있었다. An elevated blood platelet count has been reported in a number of clinical conditions. Primary thrombocytosis associated with the myeloproliferative disorders is well known and secondary or reactive thrombocytosis has been related to several conditions such as malignacies, infections and postsplenectomy or other surgical conditions. This study was carred out on 72 children with severe bacterial infections who were admitted to the department of Pediatrics, Cong San Medical Center, Keimyung University to investigate the response of thrombocytes to the severe bacterial infectiions and to observe the changing patterns of thrombocytes in severe infections. Pneumonia(17cases), empyema(15cases), sepsis(10cases), meningitis(18cases)and acute osteomyelitis(10cases) were included for this study and 30 cases of inguinal hernia admitted for herniorrhaphy otherwise healthy were studied as control. The following results were obtained. Out of 72 children with severe bacterial infections, 59 cases(81.94%) had maximal platelet count above 450×10³/㎕. Thrombocytosis were observed in 70.6% of pneumonia, 93.3% of empyema, 70.0% of sepsis, 77.8% of meningitis and 100.0% of acute ostemyelitis. Severe thrombocytosis, platelet count above 600×10³/㎕, were observed in 51.4% of the children with severe infections and more frequently seen in empyema(86.7%) and acute osteomyelitis(83.3%) than in other groups. The mean value of maximal platelet count was 615.54±183.3×10³/㎕ in severe infections and 336.53±80.72×10³/㎕ in control group. The mean value was highest in acute osteomyelitis(759.7±147.44×10³/㎕) followed by empyema(691.9±152.04×10³/㎕), meningitis(599.7±203.65×10³/㎕), pneumonia(527.9±145.26×10³/㎕) and sepsis(505.3±144.84×10³/㎕) in order. Remarkable statistical significance in degree of thrombocytosis was noted between severe infections and the control group(p<0.001). Maximal platelet count usually occured between the first and second week after admission(7.11±3.95 days in meningitis~ 10.86±6.52 days in empyema) and declined to normal value between second and fourth week(14.81±4.70days in sepsis~ 24.27±5.58 days in acute osteomyelitis). There was no significant correlation between thrombocyte count and hemoglobin(r=-0.403, P>0.05), leukocyte count (r=0.400, P>0.05) and ESR (r=0.494, P>0.05). High incidence of secondary thrombocytosis in children with severe bacterial infection was observed in this study and the incidence and the degree of thrombocytosis in children with severe protracted pyogenic bacterial infections such as acute osteomyelitis and empyema were significantly higher than in other groups.
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Circular Tibial Tuberosity Advancement for Cranial Cruciate Ligament Rupture in a Dog
한철규,강진수,이동빈,이해범,김남수,허수영 한국임상수의학회 2019 한국임상수의학회지 Vol.36 No.5
A 8-year-old, intact female, 2.1 kg, yorkshire terrier dog was referred to Animal Medical Center, Chonbuk National University due to right hindlimb lameness. Orthopedic examinations revealed pain during extension and flexion on stifle joint, positive cranial drawer sign, positive tibial compression test and patella luxation. Radiography showed the cranial displacement of right tibia with mildly increasing the synovial volume. The surgical procedure involved radial osteotomy of the proximal tibia and fixation by 1.2 T-locking plate. At two weeks after surgery, the patient was able to weight-bearing and gait gradually improved. This case report describes circular Tibial Tuberosity Advancement (cTTA) surgical technique and the successful surgical repair of cranial cruciate ligament rupture a dog.
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신서현,강진수,이동빈,이해범,김남수,허수영 한국임상수의학회 2019 한국임상수의학회지 Vol.36 No.5
A 5-year-old 6 kg male mongrel (case 1) and a 7-year-old 4.3 kg male yorkshire terrier (case 2) were presented to Chonbuk animal medical center (CAMC). Both animals had non-weight bearing hind limb lameness. Case 1 had complete rupture of cranial cruciate ligament with grade 3 medial patellar luxation. Case 2 had complete cranial cruciate ligament rupture with grade 4 medial patellar luxation. During surgery, in both cases, trochlear block recession was performed followed by CORA based leveling osteotomy (CBLO) and tibial tuberosity transposition (TTT). General soft tissue reconstructions for medial patellar luxation including medial releasing and lateral imbrication were also performed. Postoperatively, both animals demonstrated excellent recovery and regained normal weight bearing of the affected hind limb without any recognizable complication. CBLO followed by TTT can be a curative surgical option without complications in cases of cranial cruciate ligament rupture with high-grade medial patellar luxation in small breed dogs.
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