크리깅 기법을 이용한 마이크로 믹서의 최적 설계

박재용,김상락,이원구,유진식,김용대,한석영,맹주성 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-

An active micro-mixer, which was composed of an oscillating micro-stirrer in the microchannel to provide rapid, effective mixing at high flow rates was analyzed. The effects of molecular diffusion and disturbance by the stirrer were considered with regard to two types of mixer models: the simple straight microchannel and microchannel with an oscillating stirrer. Two types of mixer models were studied by analyzing mixing behaviors such as their interactionafter the stirrer. The mixing was calculated by Lattice Boltzmann methods using the D2Q9 model. In this study, the time-averaged mixing index formula was used to estimate the mixing performance of time-dependent flow. The mixing indices of the two models were compared. From the results, it was found that the mixer with an oscillating stirrer was much more enhanced and stabilized. Therefore, an optimum design for a dynamic micro-mixer with an oscillating stirrer was performed using Kriging method in order to obtain a optimum solution. The design parameters were established as the frequency, the length and the angle of the stirrer, and the optimal values were determined to be 2.0932, 0.8D and ± 75°, respectively. It was found that the mixing index of the optimal design increased by 88.47% compared with that of the original design.

폐모세포종 : 1례보고 A Case Report

최영호,서홍주,임영혁,김정중,박성강,이석기,임진수,김은규 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2

Pulmonary blastoma is a very rare primary neoplasm of the lung. We experienced a case of pulmonary blastoma in a 40 years old man. The mediobasal segmentectomy of the right lower lobe was performed. The patient was discharge on the postoperative days 6. There is no evidence of recurrence or metastasis on followup study during 7 months period after operation.

개심술(開心術)의 임상적 고찰 : 치험 200예 200 Cases

최형호,서홍주,임영혁,김정중,배대양,이석기,임진수 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.2

Background and Objectives: Two hundred cases of the open heart surgery due to congenital and acquired heart disease were done using the cardiopulmonary bypass in the Department of Thoracic and Cardiovascular surgery, Chosun University Hospital from November, 1980 to June, 2001. Material and Methods: The number of congenital heart disease was 132 cases. 68 cases were acquired heart disease. 'The age of the congenital heart disease was from 22 days to 45 years. In the acquired heart disease, the age was from 14 to 72 years. Result: Congenital heart disease consisted of 113 congenital acyanotic heart disease, 19 congenital cyanotic heart disease. Corrective operation was done for congenital heart disease with 4. 5 % operative mortality. Of 68 cases acquired heart disease, 44 patients were valvular heart disease, 3 cardiac tumors, 9 ischemic heart diseases, 12 aortic dissections and etc. The operative mortality was 13%. Conclusion: The postoperative complications were appeared in 68 cases and the complications were wound infection, occipital alopecia, low cardiac output syndrome, arrhythmia, septicemia etc. The mortality after open heart surgery was 15 cases and the causes of death were low cardiac output syndrome, septicemia, respiratory failure and left ventricle rupture.

실험계획법을 이용한 능동형 미소혼합기의 근사최적화

박재용,이원구,유진식,김용대,한석영,맹주성 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

An active micro-mixer, which was composed of an oscillating micro-stirrer in the microchannel to provide rapid, effective mixing at high flow rates was analyzed. The effects of molecular diffusion and disturbance by the stirrer were considered with regard to two types of mixer models: the simple straight microchannel and microchannel with an oscillating stirrer. Two types of mixer models were studied by analyzing mixing behaviors such as their interactionafter the stirrer. The mixing was calculated by Lattice Boltzmann methods using the D2Q9 model, In this study, the time-averaged mixing index formula was used to estimate the mixing performance of time-dependent flow. The mixing indices of the two models were compared. From the results, it was found that the mixer with an oscillating stirrer was much more enhanced and stabilized. Therefore, an approximate optimization of an active micro-mixer with an oscillating stirrer was performed using Kriging method with OLHD(Optima1 Latin Hypercube Design) in order to obtain a optimum solution. The design parameters were established as the frequency, the length and the angle of the stirrer, and the optimal values were determined to be 1.0346, 0.66D and ±45°, respectively. It was found that the mixing index of the optimal design increased by 88.72% compared with that of the original design.

양다래 과실의 아미노산조성과 유리당의 분석

李明烈,朴貞淑,李柱烈,金忠模,洪石淳 조선대학교 기초과학연구소 1992 自然科學硏究 Vol.15 No.1

Actindia chinensis의 一般成分, 遊離糖 및 amino acid 組成狀態를 알아보기 위하여 HPLC 등으로 분석, 定量한 結果는 다음과 같다. 1. 粗蜜白質量은 2.77%, 炭水化物量은 11.97%이었다. 2. 遊離糖으로는 glucose, fructose, sucrose 및 maltose가 檢出되었으며 과육부에는 fructose, 껍질부에는 sucrose 및 maltose가 많이 함유되었다. 3. 과육질 및 껍질부에서 17種의 總 및 유리 amino acid이 검출되었는데 과육부에는 isoleucine 191.52mg/100g, glutamic acid 160.93mg/100g, 껍질부에는 g1utamic acid 203.36mg/100g, aspartic acid 168.46mg/100g으로 가장 많이 함유되어 있으며, 必須 아미노산 量은 껍질부가 528.23mg/100g으로 과육부 (350.90mg/loog)보다 약 1.5배 정도 많았다. 4. 遊離 아미노산 量은 과육부 (136.89mg/loog)가 껍질부 (120.55mg/100g)에 비해 다소 많았으며 他 과일에 비하여 histidine, arginine量이 많았다. Approximate compositions, and contents of free sugars and amino acids of edible and nonedidle portion in Kiwi fruit 〔Actindia chinensis planch〕were analyzed by HPLC. The results were as follows; The contents of protein and sugars in kiwi fruit were 2.77% and 11.97%, respectively. Glucose, fructose, sucrose and maltose were detected and fructose was rich in edible portion, and sucrose and maltose in nonedible portion. 17 kinds of total amino acids were detected in edible and nonedible portion. The contents of isoleucine(191.52mg/100g) and glutamic acid (160.93mg/100g) in edible portion, and glutamic acid (203.36mg/100g) and asparatic acid (168.48mg/100g) in nonedible portion were high. Total amounts of essential amino acids of nonedidle portion (523.23mg/100g) were rich than that of edible portion (350.90mg/100g). Free amino acids were contained 136.89mg/100g in edible portion and 120.55mg/100g in nonedible portion. Histidine and arginine were found in abundance, compared to other fruits (orange and strawbeery).

순차적 크리깅기법을 이용한 미소혼합기의 최적화

박재용,유진식,황승민,임민규,오영규,김용대,한석영,맹주성 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

An active micro-mixer, which is composed of an oscillating micro-stirrer in the micro-channel to provide effective mixing was optimized. The effects of molecular diffusion and disturbance by the stirrer were considered with regard to two types of mixer models: the simple straight micro-channel and micro-channel with an oscillating stirrer. Two types of mixer models were studied by analyzing mixing behaviors such as their interaction after the stirrer. The mixing was calculated by Lattice Boltzmann methods using the D2Q9 model. In this study, the time-averaged mixing index formula was used to estimate the mixing performance of time-dependent flow. The mixing indices of the two models were compared. From the results, it was found that the mixer with an oscillating stirrer was much more enhanced' and stabilized. Therefore, an approximate optimization of an active micro-mixer with an oscillating stirrer was performed using Kriging method with OLHD (Optimal Latin Hypercube Design) in order to determine the optimal design variables. The design parameters were established as the frequency, the length and the angle of the stirrer. The optimal values were obtained as 1.5754, 0.803D and ±45°, respectively. It was found that the mixing index of the optimal design increased by 83.36% compared with that of the original design.

Clinical and Genetic Features of Korean Inherited Arrhythmia Probands

Joo Hee Jeong,Suk-Kyu Oh,Yun Gi Kim,Yun Young Choi,Hyoung Seok Lee,Jaemin Shim,Yae Min Park,Jun-Hyung Kim,Yong-Seog Oh,Nam-Ho Kim,Hui-Nam Pak,Young Keun On,Hyung Wook Park,Gyo-Seung Hwang,Dae-Kyeong K 대한심장학회 2023 Korean Circulation Journal Vol.53 No.10

Background and Objectives: Inherited arrhythmia (IA) is a more common cause of sudden cardiac death in Asian population, but little is known about the genetic background of Asian IA probands. We aimed to investigate the clinical characteristics and analyze the genetic underpinnings of IA in a Korean cohort. Methods: This study was conducted in a multicenter cohort of the Korean IA Registry from 2014 to 2017. Genetic testing was performed using a next-generation sequencing panel including 174 causative genes of cardiovascular disease. Results: Among the 265 IA probands, idiopathic ventricular fibrillation (IVF) and Brugada Syndrome (BrS) was the most prevalent diseases (96 and 95 cases respectively), followed by long QT syndrome (LQTS, n=54). Two-hundred-sixteen probands underwent genetic testing, and 69 probands (31.9%) were detected with genetic variant, with yield of pathogenic or likely pathogenic variant as 6.4%. Left ventricular ejection fraction was significantly lower in genotype positive probands (54.7±11.3 vs. 59.3±9.2%, p=0.005). IVF probands showed highest yield of positive genotype (54.0%), followed by LQTS (23.8%), and BrS (19.5%). Conclusions: There were significant differences in clinical characteristics and genetic yields among BrS, LQTS, and IVF. Genetic testing did not provide better yield for BrS and LQTS. On the other hand, in IVF, genetic testing using multiple gene panel might enable the molecular diagnosis of concealed genotype, which may alter future clinical diagnosis and management strategies.

Transport alternating current losses of BSCCO and YBCO tapes

Kim, Seog-Whan,Joo, Jin-Hong,Song, Kyu Jeong,Park, Chan,Ko, Rock-Kil,Ha, Hong-Soo,Kim, Ho-Sup,Moon, Seung-Hyun,Yoo, Sang-Im,Ryu, Kyungwoo IEEE 2005 IEEE transactions on applied superconductivity Vol.15 No.2

After the discovery of HTS (High Temperature Superconductor), many types of HTS conductors have been developed. Several BSCCO tapes fabricated by PIT (Powder In Tube) method became commercially available, and the transport current loss characteristics of BSCCO tapes have been investigated by many research groups. The transport current loss characteristics of YBCO tapes, however, are not well studied. This is because measuring transport current requires tape samples over a certain length (15 cm for our own system). Many groups are currently focusing their effort on manufacturing long YBCO tape conductors, and new world records of length and current carrying capability are replacing the old ones in an increasingly fast rate. This paper deals with transport current losses of commercially available BSCCO tapes and YBCO tapes made at Korea Electrotechnology Research Institute (KERI) of Korea. YBCO tapes show relatively high transport current losses. This can be explained by the fact that the YBCO tape does not consist of filaments. Measurement results of the tapes are presented with analyses and discussions.

Low-order Robust Power System Stabilizer for Single-machine Systems: An LMI Approach

Seog-Joo Kim,Soonman Kwon,문영현 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.3

This paper describes a linear matrix inequality (LMI) approach to the design of robust low-order power system stabilizers (PSSs), which are used to damp out local-mode oscillations of synchronous generators. The performance of a PSS is expressed as the location of the closed-loop poles, and a single fixed-gain pole-placement controller is synthesized for a wide range of operating conditions. The synthesis results in simultaneous regional pole-placement stabilization through static output feedback, and is formulated as a novel LMI feasibility problem with a rank condition. A penalty method is applied to solve the rank-constrained LMI problem. Numerical experiments with a single machine connected to an infinite bus system were performed to demonstrate the proposed LMI method, and the results were compared with those of previous work.

Clomipramine에 의해 유발된 만성 확장성 심근증 1예

김응주,박창규,신성희,김진원,손장욱,강창돈,최창원,김병회,김현철,이승진,이은미,안정천,서홍석,오동주,노영무 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8