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각종 간질환에서의 (肝疾患) 혈청 (血淸) High Density Lipoprotein - Cholesterol 의 변동
안성훈(Sung Hoon Ahn),박승국(Seung Kook Park),허정욱(Jung Wook Hur),이호찬(Ho Chan lee),김정철(Jung Chul Kim),정태호(Tai Ho Chung) 대한소화기학회 1984 대한소화기학회지 Vol.16 No.1
N/A In patients with liver disease, abnormalities of cholesterol metabolism has been suspected. Hence concentrations of cholesterol in whole serum, and cholesterol concentrations in the high density lipoprotein fraction of serum was measured after the precipitation of low density and very low density lipoproteins with sodium phosphotungstate-13Mg in l patients with liver cirrhosis, 10 patients with acute hepatitis, 10 patients with chronic hepatitis, 7 patients with hepatoma, 5 patients with obstructive jaundice, and 24 healthy control subjects. Total cholesterol concentrations in patients with hepatic cirrhosis were significantly lower than control, but in patients with chronic hepatitis, and obstructive jaundice, total cholesterol concentrations were slightly higher than control. High density lipoprotein cholesterol concentrations in various liver disease were significantly lower than control, and their ratios of high density lipoprotein cholesterol to total cholesterol were also significantly low.
안성훈(Sung Hoon Ahn),허정욱(Jung Wook Hur),전영준(Young Joon Jeon),박승국(Seong Kook Park),정병천(Byoung Chun Joung),강재원(Jae Won Kang) 대한소화기학회 1985 대한소화기학회지 Vol.17 No.1
N/A The peptic diseases in infants and children are no longer rare conditions in these days. Upper G-I barium study is usual method of choice to make diagnosis of peptic disorders in children in Korea. We report the endoscopic experiences on pediatric age group, 90 cases, in the endoscopic unit during five years period until september l984 1) Olympus GIF type Q, type P-10 and Fujinon UGI type FP were available endoscopes. 2) 0.3% procaine viscous was used for pharyngeal anesthesia over 5 years of age without diazepam injection or general anesthesia. No premedication was used for under 5 years of age. 3) Chief complaints or signs of patients were abdominal pain, hematemesis and/or melena and vomiting in order. 4) Of ninty patients, 40 children were found to be normal endoscopic finding, 15 were gastritis, 15 duodenal ulcer, 6 gastric ulcer, 4 esophageal varices, 3 duodenitis and 2 achalasia respectively. 5) Among 22 upper G- I bleeders, 37% were due to peptic ulcer origin. Four of 5 unknown original bleeders were identified to be nasal origin. 6) There were no significant complications or sequelae during and after endoscopic procedures. 7) Pediatric endoscopy by experienced personels was thought to be safe, effective and easy matter.
간경변증환자에서 고농도 분지형 아미노산제제 투여후 혈중 아미노산과 간기능 검사상의 변화 - 일반 아미노산제제와 비교조사 -
안성훈 ( Sung Hoon Ahn ),박승국 ( Soong Kook Park ),박원대 ( Won Dae Park ),한승범 ( Seung Beum Han ),이수형 ( Soo Hyeong Lee ),허정욱 ( Jeug Wook Hur ) 대한소화기학회 1987 대한소화기학회지 Vol.19 No.1
N/A This study was done to compare the therapeutic effect of enriched branched chain amino acid (BCAA) infusion to regular amino acid infusion for the decompensated liver cirrhosis. Enriched BCAA solution (Pamisol) was given to 30 patients and regular amino acid solution (Salviamine) was given to 8 patints. The changes of plasma amino acid concentrations and liver profiles in before and 7 days after amino acid infusion daily 1,000 ml were compared. The results were as follow. 1) In the group of patients given enriched BCAA infusion, the plasma concentrations of valine, leucine, isoleucine (BCAA) increased (p<0.001), while the phenylalanine, tyrosine (aromatic amino acid: AAA) decreased (p<0.001). 2) In the group of patients given regular amino acid infusion, both BCAA and AAA concentrations increased (p+0.001). 3) In the group of patients given enriched BCAA infusion, total protein increased (p<=0.01), total bilirubin decreased (p<=0.01), prothrombin time shortened (p<0.05), and blood ammonia decreased (p< 0.01). 4) In the group of patients given regular amino acid infusion, only total protein increased (p < 0.01) but, bilirubin, prothromoin time and blood ammonia remained no significant changes. 5) The molar ratio of BCAA/AAA more improved in the enriched BCAA infusion than regular amino acid.
쾌속조형재료의 강도예측모델 - Fused Deposition Modeling (FDM)
안성훈 ( Sung Hoon Ahn ),이선영 ( Sun Young Lee ),백창일 ( Chang Il Baek ),추원식 ( Won Shik Chu ) 한국복합재료학회 2002 Composites research Vol.15 No.6
쾌속조형(Rapid Prototyping)기술은 다양한 형태의 재료를 사용하여 초기모형을 제작할 수 있다. Stratasys사의 FDM은 플라스틱 재료로 조형물을 제작하는 대표적인 쾌속조형공정이다. 또한 FDM으로 제작된 부품들은 하중을 받는 구조용 재료로도 사용된다. FDM은 약 300㎛ 두께의 가는 필라멘트의 형태로 일정한 방향으로 재료를 적층하므로, FDM으로 제작된 부품들은 이방성 재료의 성질을 나타낸다. 본 연구에서는 FDM 부품의 인장강도를 예측하기 위한 해석방법을 제시하고자 한다. 복합재를 위한 Classical Lamination Theory를 사용하여 컴퓨터 코드를 작성하였다. FDM 제품의 파괴를 예측하기 위하여 계산코드에 Tsai-Wu failure criterion 이론을 도입하였다. 해석방법에 의해 예상되는 인장강도와 실제 실험으로 얻은 수치를 비교하였다. 예상치가 측정치에 근사한 값을 보이므로 본 계산식의 타당성이 입증되었다. 덧붙여서 FDM의 강도계산과 설계규칙이 웹기반의 제안서비스(FDMAS)에서 제공된다. Rapid Prototyping(RP) technologies provide the ability to fabricate initial prototypes from various model materials. Stratasys` Fused Deposition Modeling(FDM) is a typical 게 process that can fabricate prototypes out of plastic materials, and the parts made from FDM were often used as load-carrying elements. Because FDM deposits materials in about 300㎛ thin filament with designated orientation, parts made from FDM show anisotropic material properties. In this paper an analytic model was proposed to predict the tensile strength of FDM parts. Applying the Classical Lamination Theory, which was developed for laminated composite materials, a computer code was implemented. Tsai-Wu failure criterion was added to the code to predict the failure of the FDM parts. The tensile strengths predicted by the analytic model were compared with experimental data. The data and prediction agreed reasonably well to prove the validity of the model. In addition, a web-based advisory service(FDMAS) was developed to provide strength prediction and design rules for FDM parts.
상부 위장관 이물에 대한 임상적 고찰 : 내시경적 진단과 적출
안성훈(Sung Hoon Ahn),허정욱(Jung Wook Hur),강영우(Young Woo Kang),이준호(Jun Ho Lee),박승국(Seoung Kook Park),박태원(Tae Won Park),강진무(Chin Moo Kang) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.5
N/A Today upper gastrointestinal (UGI) endoscopy is widely used in diagnosis and management of foreign bodies. A clinical study of 76 cases with the foreign bodies in the upper gastrointestinal tract diagnosed by flexible UGI endoscopy in Dangsan Hospital from January 1982 to December 1992 was performed. Foreign bodies were common in male (rate 1,6: 1) and in 6th decade (28 cases, 36.8%). Bezoar was the most common foreign body (57 cases, 75.0%) and foreign bodies were mostly lodged in stomach (50 cases, 65.8%). Endosopic removal or destruction was successful in 31 cases (35.4%) including all 19 cases other than bezoar. 52 cases (68.4%) hacl combined diseases, 17 cases (22.4%) had past history of operation and 9 cases (11.8%) had history nf ingestion of foreign bodies. In conclusion, UGI endoscopy and endoscopic removal is required to diagnose and manage foreign bodies in UGI tract
안성훈(Sung-Hoon Ahn),김형중(Hyung-Jung Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this paper a web-based micro fabrication system is discussed. A commercial CAD and a web browser were used as its user interfaces. In these user interfaces the concepts of Design for Manufacturing (DFM) was implemented providing the fabrication knowledge of micro machining to the designers. Simple databases were constructed to store the fabrication knowledge of materials, tools, and micro machining know-how. The part geometry was uploaded to the web server of this system as an STL (Stereo Lithography) format with process parameters for 3-axis micro milling. A Slice-based process planner automatically provides NC codes for controlling micro stages. A couple of micro parts were fabricated using the system with micro endmills. This design and manufacturing system enables network users to obtain micro-scale prototypes in a rapid manner.