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한승엽(Seung-Yeob Han),남효석(Hyo Suk Nam),장혁재(Hyuk-jae Chang),박은정(EunJeong Park) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
Health care systems or Hospital Information systems have accumulated a lot of amount of medical data. The naive feature set might have noisy or redundant features. The performance of complex model for the initial data can deteriorate, since the naive data set might have noisy or redundant features and they require a lot of resources and time for computation. To Challenge this problem, We applied a series of feature selection(FS) techniques to the prediction of the modified Rankin Scale (mRS), which is a measure of the daily activity disorder of people suffering from stroke, using the 8 famous FS. The experiment compared the performance of classifications with FS algorithms using stroke data set that is supposed of 81 representation features for stroke. Experimental results show that, Random Foest(RF) classification with a filter based for FS using of f-score and t-score performed best in accuracy. It was also demonstrated that Genetic algorithm(GA) with RF produced the most effective set in the 3 wrapper methods. GA with RF produced the most effective feature set for mRS prediction, This can have almost the same accuracy with 69.6% less model learning time than all features.
성정훈 ( Seong Jeong Hun ),강미정 ( Kang Mi Jeong ),황은아 ( Hwang Eun A ),한승엽 ( Han Seung Yeob ),박성배 ( Park Seong Bae ),김현철 ( Kim Hyeon Cheol ),박관규 ( Park Gwan Gyu ) 대한신장학회 2004 Kidney Research and Clinical Practice Vol.23 No.2
The term type Ⅱ membranoproliferarive glomerulonephritis (MPGN) refers to the histopathologic entity characterized by dense intramembranous deposits. It have a variable clincal courses, frequently occurs in older children and young adult. In comparison with The western, the idiopathic membranoproliferative glomerulonephritis (MPGN) has a lower frequency than secondary MPGN. Especially, of the idiopathic MPGN, the frequency of type 2 MPGN, so called dense deposit disease, is very rare in Korea. We are reporting two cases of type Ⅱ MPGN, which was proven by renal biopsy. The clinical manifestations were recurrent gross hematuria in one patient and persistent nephrotic-ranged proteinuria in the other patient. The biopsy findings are characterized by diffuse wall thickening of capillary walls and focal proliferation of mesangial cell in light microscopy, and by capillary wall and granular basement membrane staining of C3 in immunofluorescence microscopy, and an irregular fusiform swelling of the lamina densa which resulting in a further thickening of basement of basement membrane in electron microscopy. Our two patients were treated conservatively without using steroid or immunosuppressive agents. One patient who had followed-up for 7 years after diagnosis remain stable in renal function, and the other patient who had followed-up for 4 years after diagnosis showed persistent nephrotic-range proteinuria. (Korean J Nephrol 2004;23(2):335-340)
강미정 ( Kang Mi Jeong ),곽충환 ( Gwag Chung Hwan ),진규복 ( Jin Gyu Bog ),황은아 ( Hwang Eun A ),한승엽 ( Han Seung Yeob ),박성배 ( Park Seong Bae ),김현철 ( Kim Hyeon Cheol ) 대한신장학회 2004 Kidney Research and Clinical Practice Vol.23 No.2
배 경 : 신세관성 산증은 신세관에서의 산성화 기능장애로 대사성 산증 초래하는 질환이다. 이중 제 4형 신세관성 산증은 원위 신원에서 칼륨과 수소이온의 분비장애로 인해 산혈증과 고칼륨혈증이 생기는 질환이다. 제 4형 신세관성 산증은 신세관성 산증 증에서 가장 빈도가 높으며 흔히 저레닌성 저알도스테론증이 동반됨이 알려져 있다. 그러나 아직도 국내에서는 세 4형 신세관성 산증에 관한 몇몇 증례만 보고되었을 뿐 종합적인 임상 보고는 거의 없다. 방 법 : 저자들은 1984년부터 2003년 3월까지 계명의대 동산병원에서 진단한 고칼륨혈증을 동반한 원위 신세관성 산증 50명을 대상으로 임상소견, 동반질환 및 전해질 소견, 치료 및 경과를 후향적으로 관찰하였다. 결 과 : 전체 50명 가운데 남자 23명, 여자 27명이었으며 평균 연령은 50.8≥19.5세였다. 동반질환으로는 신이식 후 14명(28%), 당뇨병 11명 (22%), 전신성 홍반성 남창 6명 (12%), 고혈압 6명 (12%), 만성 신세관간질성 신질환 6명 (12%), 그 외 윈인미상이 5예 (10%)였다. 임상증상으로는 무증상의 고칼륨혈증이 17명 (34%)으로 가장 많았고, 그 다음은 전신쇄약감 14명 (28 %), 전신부종 8명 (16%), 호흡곤란 5명 (10%), 기타 증상이 6예 (12%) 있었다. 진단시 신기능은 혈청 평균 creatinine 2.1±1.3 ㎎/dL, 평균 creatinine 청소율 25.6±16.4 mL/min 이었으며 혈청 pH는 7.3±0.05, 혈청 HCO₃^(-) 16.3±2.9 mEq/L을 보였다. 혈청 음이온 차는 평균 8.05±2.16, 혈청 Na는 평균 136.9±4.6 mEq/L, 혈청 Cl는 평균 110.9±5.2 mEq/L이었고, 혈청 K는 평균 6.18±0.64 mEq/L로 증가되었다. 요 pH는 평균 5.83±0.87이었고, 요 음이온차는 평균 37.9±30.6의 양의 값을 보였다. 혈장 레닌과 알도스데론치의 평균은 각각 3.82±7.16 ng/mL/hr, 110.2±108.16 ng/mL이었다. 치료는 9-α-fludrocortisone 단독이 19명 (38%), furosemide 단독 7명 (14%), K-교환수지 단독 5명 (10%), furosemide와 K-교환수지 병용 5명 (10%), 식이로 조절한 경우가 10명 (20%)이었다. 결 론 : 제 4형 신세관성 산증은 비교적 흔한 전해질 대사 질환으로 원인 미상의 고칼륨혈증이 동반될 경우 가장 먼저 의심해야할 질환 중의 하나로 조기 진단을 통한 병태생리적 치료가 필요할 것으로 생각된다. Purpose : Renal tubular aicdosis (RTA) is a disorder of renal acidification out of porportion to the reduction in glomerular filtration rate. Type Ⅳ RTA refers to hyperkalemic metabolic acidosis resulting from aldosterone deficiency or resistance. The incidence of each type RTA has not been reported exactly, however reports on type Ⅳ RTA have been recently increasing. Methods : A retrospective clinical analysis was performed in 50 patients with hyperkalemic distal renal tubular acidosis diagnosed between Jan. 1984 and Feb. 2003 at Department of Internal Medicine, Keimyung University, Dongsan Medical Center. Results : From 1984 to 2003, 50 cases of hyperkalemic distal renal tubular acidosis were diagnosed. The mean age was 50.8±19.5 years. The two most common conditions were posttransplantation (28%), and diabetes mellitus (22%), which were followed by hypertension (12%), systemic lupus erythematosus (12%), chronic renal failure (12%), and others (26%). Asymptomatic hyperkalemia (34%), and muscle weakness (28%) were the two most common clinical presentations. All patients demonstrated normal anion gap acidosis with positive urine anion gap. The mean creatinine learance was 25.6±16.4 mL/min. The mean baseline PRA and aldosterone levels were 3.82±7.16 ng/mL/hr and 110.02±108.2 ng/mL, respectively. Hyperkalemia was well responded to 9-α-fludrocortisone, furosemide, K-exchane resin, and combinations of these regimens. Conclusion : Type Ⅳ RTA is the most common type of RTA in children and adults, and can be an important cause of asymptomatic hyperkalemia. Therefore, type Ⅳ RTA should be included in the diffrential diagnosis of unexplained hyperkalemia in various clinical settings. (Korean J Nephrol 2004;23(2):263-269)