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VR 시뮬레이션을 이용한 첨단안전차량의 동특성 평가에 관한 연구
전지훈(Jee-Hoon Chun),권성진(Seong-Jin Kwon),장석(Suk Jang),조기용(Ki-Yong Cho),서명원(Myung-Won Suh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
VR(Virtual Reality) simulation becomes a useful method in automobile industry because of its benefit to curtail expenses and reduce the risk of experiments. In this study, VR simulation which makes it possible to consider the effect of driver, is applied to evaluate dynamic characteristics of ASV(Advanced Safety Vehicle). The VR system, which is constructed, generates visual and sound information of the vehicle and the driving environment. The mathematical model of vehicle dynamics and ASV functions are also proposed for simulations. ACC(Adaptive Cruise Control) function and FVCWS(Forward Vehicle Collision Warning System) are selected as ASV function for this study. The real-time simulation algorithm synchronises vehicle dynamics simulation with VR rendering. Some scenarios are also suggested for evaluating ASV function. The ASV VR simulation results are compared with experiments. The simulation results showed that the VR simulation is very useful method for evaluating dynamic characteristics of the ASV on various driving conditions.
( Jee Hye Kwon ),( Changhyun Lee ),( Ji Min Choi ),( Yoo Min Han ),( Young Hoon Choi ),( June Young Lee ),( Hyuk Yoon ),( Jaeyoung Chun ),( Kyu Joo Park ),( Jong Pil Im ),( Sang Gyun Kim ),( Joo Sung 대한장연구학회 2013 Intestinal Research Vol.11 No.4
Ulcerative colitis is a chronic inflammatory bowel disease of unknown etiology, associated with extraintestinal manifestations, including the rarely reported immune thrombocytopenic purpura. Here, we present a case of immune thrombocytopenic purpura associated with preexisting ulcerative colitis. The patient was diagnosed with ulcerative colitis 13 years ago. Two years after diagnosis, he presented with hematochezia and active ulcerative colitis. Despite steroid use, the platelet count gradually decreased to 21,000/mm3. Hematochezia and the platelet count recovered after the administration of cyclosporine, and ulcerative colitis was in near complete remission for 11 years. However, the patient was re-admitted for hematochezia and thrombocytopenia persisting over a month. Medical management including increased doses of steroids in combination with cyclosporin failed to control hematochezia and thrombocytopenia. Immune thrombocytopenic purpura was suspected on the basis of normocellular marrow with a normal number of megakaryocytes. To treat uncontrolled colitis and steroid-refractory thrombocytopenia, total proctocolectomy with ileal pouch-anal anastomosis and splenectomy were performed. The patient was followed up for 10 months after surgery and was found to be in good health with a normal platelet count. Therefore, colectomy alone or in combination with splenectomy should be considered in cases of life-threatening ulcerative colitis complicated with steroid-refractory immune thrombocytopenic purpura. (Intest Res 2013;11:310-316)
Jee-Hoon Choi,Yong-Min Chun,Tae-Hwan Yoon 대한견주관절학회 2023 대한견주관절의학회지 Vol.26 No.4
Background: The purpose of this study was to determine the association between smoking and clinical outcomes of hook plate fixation for acute acromioclavicular (AC) joint injuries. Methods: This study retrospectively investigated 82 patients who underwent hook plate fixation for acute AC joint dislocation between March 2014 to June 2022. The patients were grouped by smoking status, with 49 in group N (nonsmokers) and 33 in group S (smokers). Functional scores and active range of motion were compared among the groups at the 1-year follow-up. Coracoclavicular distance (CCD) was measured, and difference with the uninjured side was compared at initial injury and 6 months after implant removal. Results: No significant differences were observed between the two groups in demographic factors such as age and sex, as well as parameters related to initial injury status, which included time from injury to surgery, the preoperative CCD difference value, and the Rockwood classification. However, the postoperative CCD difference was significantly higher in group S (3.1±2.6 mm) compared to group N (1.7±2.4 mm). Multivariate regression analysis indicated that smoking and the preoperative CCD difference independently contributed to an increase in the postoperative CCD difference. Despite the radiographic differences, the postoperative clinical outcome scores and active range of motion measurements were comparable between the groups. Conclusions: Smoking had a detrimental impact on ligament healing after hook plate fixation for acute AC joint dislocations. This finding emphasizes the importance of smoking cessation to optimize reduction maintenance after AC joint injury. Level of evidence: III.
MRI features of skeletal muscle lymphoma.
Chun, Chang Woo,Jee, Won-Hee,Park, Hye Jung,Kim, Yeo Joo,Park, Jeong-Mi,Lee, Sang-Hoon,Park, Sung-Hwan American Roentgen Ray Society, etc.] 2010 American Journal of Roentgenology Vol.195 No.6
<P>OBJECTIVE: The purpose of this study was to assess the MRI findings of skeletal muscle lymphoma. MATERIALS AND METHODS: MR images of pathologically proven lymphoma of skeletal muscle in 20 patients were retrospectively reviewed for the presence or absence of individual imaging findings. Nine patients had primary muscle lymphoma, and 11 patients had muscle metastasis from systemic lymphoma. RESULTS: The initial manifestation of skeletal muscle lymphoma was a muscle mass in 15 patients (75%) and abnormal muscle signal intensity in five patients (25%). Muscle enlargement was found in all cases. Long segmental involvement with orientation of the tumor along muscle fascicles was found in 15 patients (75%). Seventeen patients (85%) had traversing vessels within involved muscles. All of the tumors had equal to slightly increased signal intensity compared with normal muscle on T1-weighted images and intermediate signal intensity compared with fat on T2-weighted images. Among the 19 patients who underwent contrast-enhanced imaging, skeletal muscle lymphoma exhibited diffuse homogeneous enhancement in 13 patients (68%), predominantly peripheral thick bandlike enhancement in four patients (21%), and marginal septal enhancement in two patients (11%). Thick irregular enhancement of both deep and superficial fascia was found in 16 patients (84%), and one patient (5%) had deep enhancement only. Subcutaneous stranding was found in 16 patients (80%) and skin thickening in four patients (20%). CONCLUSION: Skeletal muscle lymphoma has distinctive MRI features that help differentiate it from other soft-tissue tumors and tumorlike lesions.</P>
히트파이프 열교환기를 이용한 전자통신장비 콘솔의 냉각 기술에 관한 연구
최지훈(Jee-Hoon Choi),유성열(Seong-Ryoul Ryoo),성병호(Byung-Ho Sung),이정환(Jung-Hwan Lee),김종만(Jong-Man Kim),전지환(Ji-Hwan Chun),서명원(Myung-Won Suh),김철주(Chul-ju Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The fan is widely used to cool high heat flux generated as of the electronic communication device consoles. It, however, makes a lot of noises that interfere considerably with the operation environment. This study was conducted to obtain the cooling design technology of the consoles through being equipped with the Heat Pipe Heat Exchangers (HPHE) together with low revolution fans in place of existing fans for the cooling technology of the forced convection. Not only the sealed type consoles but the HPHE were also designed so as to cool effectively the heat generated from the inside of the console. The simulation was conducted by computational numerical analysis along with its experiments. The results of the numerical analysis and experiments were compared in order to improve the cooling technology of the consoles mounted with the HPHE. Consequently, instead of loud fan noise generated as of existing forced convection methods, the cooling technology of HPHE can remarkably improve many problems such as the operation environment, indoor dust, malfunction caused by pollution sources and so on.
만성 신부전 환자의 혈액투석중 폐기능 변화에 관한 연구
이지훈(Jee Hoon Lee),김기영(Ki Young Kim),김성수(Sung Su Kim),박인원(In Won Park),강응택(Eung Taek Kang),최병휘(Byeung Whui Choi),허성호(Sung Ho Hue),유석희(Suk Hee Yu),박선규(Sun Kyu Park),서승천(Seung Chun Seo) 대한내과학회 1990 대한내과학회지 Vol.39 No.2
N/A Hypoxemia has occurred during the first 30-60 minutes of hemodialysis in patients with chronic renal failure who bad undergone hemodialysis regularly. It is primarily caused by hypoveniilation, secondary to carbon dioxide losses via dialysates and leukopenia associated with pulmonary vascular leukostasis which was induced by complement activation due to cuprophane membrane. However, there is still controversy over whether hypoxemia might be the result of bronchoconstriction during hemodialysis. To assess the relationship between hypoxemia and the changes of peripheral white blood cell counts and pulmonary function test when cuprophane membrane and acetate buffer solution had been used, arterial blood gas analysis, white blood cell counts, pulmonary function test during the first 120 minutes of hemodialysis were measured. The results were as follows: 1) The major falls of arterial blood oxygen tension occurred 15 minutes after the start of hemodialysis(p<0.05), and the biearbonate concentration significantly and gradually increased 30 minutes and 120 minutes after the start of hemodialysis(p<0.05). 2) The pulse rate significantly increased 15 minutes and 30minutes after the start of hemodialysis(p<0.05). 3) The arterial white blood cell counts and the precentage of neutrophil significantly decreased 15 minutes after the start of hemodialysis and then gradually recovered to a predialytic level(p<0.05), but the percentage of lymphocytes significantly increased 15 minutes after the start of hemodialysis and then gradually recovered to a predialytic level (p<0.05). 4) MMF, PEFR, and FEF75 significantly increased, but no significant changes of FEV1/FVC occurred during hemodialysis. Therefore, we suggest that acute hypoxemia may occur not due to bronchoconstriction, but due to pulmonary vascular leukostasis associated with complement activation.
A Case of Gastric Adenocarcinoma in a Shih Tzu Dog: Successful Treatment of Early Gastric Cancer
LEE, Hee-Chun,KIM, Ji-Hyun,JEE, Cho-Hee,LEE, Jae-Hoon,MOON, Jong-Hyun,KIM, Na-Hyun,SUR, Jung-Hyang,CHO, Kyu-Woan,KANG, Byeong-Teck,HA, Jeongim,JUNG, Dong-In The Japanese Society of Veterinary Science 2014 The Journal of veterinary medical science Vol.76 No.7
<P><B>ABSTRACT</B></P><P>A 9-year-old castrated male Shih Tzu dog was referred to us, because of chronic vomiting. The patient’s hematological, radiographic, ultrasonographic, endoscopic and histological examinations were evaluated for diagnosis. Hematologic analysis indicated moderate anemia and azotemia. Based on the imaging studies, an oval-shaped mass was identified in the gastric pylorus area. A proliferative mass was found on endoscopic examination, and we performed biopsy using grasping forceps. The histopathological findings of the biopsy specimens indicated hypertrophic gastritis, and Y-U pyloroplasty was performed. However, histopathological examination of the surgically resected mass revealed tubular adenocarcinoma of the stomach. Then, carboplatin chemotherapy was performed 4 times for 13 weeks. Clinical signs, such as vomiting, were resolved gradually after surgery and chemotherapy, and the patient’s condition was managed favorably until recently (30 months after surgery). This case report describes clinical features, imaging studies, endoscopic characteristics and histopathological and immunohistochemical features of gastric tubular adenocarcinoma as early gastric cancer in a dog.</P>