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박준용,이우현,남창우 한국계량경제학회 2003 계량경제학보 Vol.14 No.1
본고는 부동산요인(공급: 건축허가면적, 수요: 25-29세 인구비율), Fama and French(1992, 1993)가 제시한 주식요인(시장요인, SMB(규모요인), HML(가치요인)), 채권요인, 박준용·이우현·남창우(2001)의 방법에 따른 거시요인 중 어느 것이 아파트시장 규모별 초과수익률을 잘 설명하는가를 시계열상에서 분석하였다. 분석결과 주식요인을 제외한 채권요인, 부동산요인, 거시요인이 각각 통계적으로 유의한 설명력을 가짐을 발견하였다. 또한 거시변수 1% 포인트 변화에 대한 아파트시장 초과수익률의 % 포인트 민감도 분석을 실시한 결과 아파트시장 초과수익률은 무엇보다도 3년만기 회사채수익률로 대표되는 금리변화에 대해 통계적으로 유의하게 음의 반응을 보인다는 사실을 발견하였다.
AI기법과 고주파 전류 변환센서를 활용한 배전반 on board 진단시스템
박준용,김영일,이동준 대한전기학회 2022 전기학회논문지 Vol.71 No.12
This paper presents an on-board switchboard diagnosis system based on the Ai algorithm for the purpose of establishing a real-time partial discharge monitoring diagnosis system. For classifying pattern of partial discharge, FCM-based RBFNN is applied to on-board diagnosis system and K-means, NN(Neural Networks) are used for comparative analysis. The data are obtained by HFCT(High Frequency Current Transformer) sensor from designed partial discharge simulation environment and its phase is divided into 128 degree. Commonly used partial discharge data analysis methods such as statistical analysis, PRPS(Phase Resolved Pulse Sequence) and PRPD(Phase Resolved Partial Discharge) are introduced. In this paper PRPDA(Phase Resolved Partial Discharge Analysis) and PCA(Principal Component Analysis) are used as a pre-processing. The Ai algorithm comparison is performed twice in total. Firstly, a comparison analysis of the test data validation of each model trained in the Python environment is conducted through a confusion matrix. Afterwards, an on-board diagnostic device is added to the partial discharge simulation circuit, and the judgment results for the actual operation are compared. Through comparative analysis in virtual and real environments, it is confirmed that the case in which FCM RBFNN is mounted shows excellent performance.
박준용,한대석,이호영,이관우,김문재,조준구 대한신장학회 1987 Kidney Research and Clinical Practice Vol.6 No.2
From August 1983 through August 1987, 21 diabetic patients with end stage renal disease were treated by continous ambulatory peritoneal dialysis. Peritoneal access was achieved by insertion of double-cuff Tenck- hoff cathter by closed medical technique. 1) The diabetic CAPD patiens were 21 cases, male 12, female 9. The non-diabetic CAPD patients were 119 cases, male 77, female 42. The mean ages of diabetic CAPD patients (58.2) were much higher than that of non-diabetic patients (40.9). 2) After CAPD, blood pressure and sugar became well controlled. There were significant improvement of hematocrit, serum clacium, phosphorus, and BUN (p$lt;0.05 respectively). But, other indexes such as serum albumin, cholesterol, and triglyceride had not changed sig- nificantly from pretreatment values. 3) Peritonitis develped once in every 9.4 patientmonths-a rate similar to that observed in nondiabetics. 4) The other complications except CAPD peritionitis were gastrointestinal effects 5 cases, depression2 cases, infection 3 cases, congestive heart failure 1 case, pleural effusion 2 cases, hypoglycemia 1 case, inguinal hernia 1 case. 5) The calculated patient survival in diabetic patients was 84%, 37% respectively at one and two years sig- nificantly lower than that observed in nondiabetics (95. 2%, 90.2% respectively at same periods). 6) The calculated catheter survival in diabetic patients was 89.3%, 73.6% at same periods, a rate similar to that observed in nondiabetics. We conclude that CAPD is a good and effective alternative treatment modality for diabetics with end stage renal disease.
박준용,임승순,황성연,윤원재,유의상 한국고분자학회 2012 Macromolecular Research Vol.20 No.12
Blends of poly(lactic acid) (PLA) and poly(ethylene terephthalate glycol) (PETG) of various compositions were prepared by melt compounding and their compatibilities, physical properties, and isothermal crystallization behaviors were investigated. The calculated solubility parameters of PETG are similar to those of PLA. The interaction parameter between PLA and PETG was derived from the Flory-Huggins theory and predicted that PLA and PETG are miscible when PETG contents are below 22 wt%. In accordance with this result, the tan δ peak and glass transition temperatures of blends determined from dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) showed a single peak at PETG contents lower than 22 wt%. Tensile test results showed that the elongation at the break of blends increased with an increase in PETG content. DSC and isothermal crystallization results showed that PETG accelerates the crystallization rate of PLA at PETG contents lower than 22 wt%, indicating that PETG acts as a nucleation agent in the crystallization of PLA. Wide angle X-ray diffraction results (WAXD)showed that the crystalline structure of PLA is not affected by the incorporation of PETG.