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진통소염제에 의한 위 십이지장 궤양에 합병된 위 출구 폐쇄 1예
최창환,변성환,장수희,백소야,Choi, Chang Hwan,Byun, Sung Hwan,Chang, Soo Hee,Paik, So Ya 대한소아소화기영양학회 2005 Pediatric gastroenterology, hepatology & nutrition Vol.8 No.2
저자들은 11개월 영아의 고열을 조절하기 위해 진통소염제 근주와 경구 해열제 병용투여 후 발생한 다발성 식도 위 십이지장 궤양 치료 과정 중 조기에 위 출구 폐쇄가 합병된 1예를 경험하였기에 보고하는 바이다. Peptic ulcer disease complicated with gastric outlet obstruction is rare in children. Even though NSAIDs have been reported to cause various adverse events, they are still regarded as safe and, therefore, widely utilized in children. In the past, pediatric patients who were at risk of seizure due to high fever, were treated with dipyrone (Metamizole sodium) injection which inhibits cyclooxygenase-1 and inhibit prostaglandin, to weaken the gastro-duodenal defensive mechanism. A case of an infant with multiple esophagogatroduodenal ulcers and bleeding caused by NSAID complicated with gastric outlet obstruction is reported in this paper.
최창환 ( Chang Hwan Choi ),설혜령 ( Hye Ryoung Sul ) 대한장연구학회 2008 Intestinal Research Vol.6 No.2
Irritable bowel syndrome (IBS) is a highly prevalent functional gastrointestinal disorder characterized by chronic abdominal pain and bowel habit change. Its specific pathophysiologic mechanism underlying IBS is not known; however, it is generally accepted that IBS symptoms represent dysregulation at multiple levels of the brain-gut axis. IBS symptoms are manifested by abnormal motor reactivity to various stimuli, and low sensation and pain thresholds. Recently, a variety of new findings have been reported which suggests low-grade inflammation or immune activation is present in IBS patients, including post-infectious IBS. The immune activation can generate various symptoms such as abdominal pain, bloating, and diarrhea that may result from motor dysfunction and visceral hypersensitivity. Anti-inflammatory therapy with either antibiotics or probiotics seems to be effective in reducing the symptoms of IBS. While this pathophysiologic approach to the management of IBS is in its infancy, it is evident that the immune activation deserves further attention in IBS. (Intest Res 2008;6:95-102)
지가의 공간분포 분석을 통한 부산시 도시공간구조해석에 관한 연구
최창환(Choi Chang Hwan),이동본(Lee Dong Bon) 한국부동산학회 2005 不動産學報 Vol.25 No.-
1. CONTENTS (1) RESEARCH OBJECTIVES This study investigates the urban spatial structure which analyzes land distribution into its price in Busan. The land is limited resources, so the price and property of land are changed. It affects the urban spatial structure. Therefore it is important that the urban spatial structure was explained by using the price of land. (2) RESEARCH METHOD cluster analysis (3) RESEARCH RESULTS As result we realized that they have no relations between density of population and the price of land, but between the price of land and the distance from downtown have relations. The relations explained that farther place from downtown is lower price of land than a location which is near to downtown. 2. RESULTS The study reaches the two conclusion : first, the spatial structure of Busan was divided into two parts of inner functional space, a part of outer functional space and 7 parts of outer area. The second conclusion of the study is that the price of outer land is more expansive than center of city in some cases. 3. KEY WORDS the piece of land, urban spatial structure, Cluster Analysis, a economic zone
수복재료와 임플랜트 종류에 따른 임플랜트 및 지지조직의 응력분포
최창환,오종석,방몽숙,Choi Chang-Hwan,Oh Jong-Suk,Vang Mong-Sook 대한치과보철학회 2002 대한치과보철학회지 Vol.40 No.1
This study was aimed to analyze the stress distribution of implant and supporting tissue in single tooth implant restoration using Branemark $system^{(R)}$(Nobel Biocare, Gothenberg, Sweden) and Bicon system(Bicon Dental Implants, Boston, MA). Two dimensional finite element analysis model was made at mandibular first premolar area As a crown materials porcelain, ceromer, ADA type III gold alloy were used. Tests have been performed at 25Kgf vertical load on central fossa of crown portion and at 10Kgf load with $45^{\circ}$ lateral direction on cusp inclination. The displacement and stresses of implant and supporting structures were analyzed to investigate the influence of the crown material and the type of implant systems by finite element analysis. The results were obtained as follows : 1. The type of crown material influenced the stress distribution of superstructure, but did not influence that of the supporting alveolar bone. 2. The stress distribution of ceromer and type III gold alloy and porcelain is similar. 3. Stress under lateral load was about twice higher than that of vertical load in all occlusal restorative materials. 4. In Bicon system, stress concentration is similar in supporting bone area but CerOne system generated about 1.5times eater stress more in superstructure material. 5. In Branemark models, if severe occlusal overload is loaded in superstvucture. gold screw or abutment will be fractured or loosened to buffer the occlusal overload but in Bicon models such buffering effect is not expected, so in Bicon model, load can be concentrated in alveolar bone area.
기전 시스템의 구동 모터 선정 방법과 견마로봇용 지뢰탐지 구동 장치에의 적용
최창환,정승호,김석환,이정엽,최덕선,정상철,박용운,Choi, Chang-Hwan,Jung, Seung-Ho,Kim, Seok-Hwan,Lee, Jeong-Yeob,Choe, Tok-Son,Chung, Sang-Chul,Park, Yong-Woon 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.4
This paper presents a motor selection technique for a manipulator design that is used in a multipurpose dog-horse robot. Since the dynamics of a manipulator and its servo drives are closely related to each other, it requires a repetitive analysis to determine a suitable motor. In order to simplify this procedure, Straete et al. proposed a simple normalization method to separate the load dependent terms and the motor dependent terms. This technique is adopted in this paper for selecting a motor in designing a manipulator.
통상협상 : 다양한 형태의 FTA 체결에 따른 Spaghetti Trap에 대한 효율적 대응방안
최창환 ( Chang Hwan Choi ) 한국통상정보학회 2010 통상정보연구 Vol.12 No.4
This paper examines the Spaghetti bowl effect that different tariffs and rules of origin in multiple FTAs have resulted in increasing the significantly additional burden for business when it comes to apply for the use of FFA preference, The wide spread of FTAs in the several years, from 2003 to 2010, has been the most important trade policy development in economically important Korea. Korea presently has 5 FTAs in effect, and made 3 additional agreements which will be expected to take effect in next year. With the study result and expecting a growing number of FTAs in Korea in a next decade, the international trading firms will face rise of transaction costs for enterprises, particularly small- and medium-sized enterprises(SMEs) to cope with multiple tariffs and rule of origins in FTAs. To help mitigate negative effects and facilitate a mote SEMs to use the FTA preference, providing new computer programs system, increasing the awareness of FA provisions, improving business participation in FTA consultations, and SME support in light of education, and financial support are needed.
최창환(Chang-hwan Choi) 한국국제상학회 2007 國際商學 Vol.22 No.1
This paper, through a demonstrative research, is to analyze outcome discrepancies between domestic and international negotiations and to verify what are the causes of lower outcome in the international negotiations. With cases study of corporate sales between the companies sold to domestic investors and those sold to foreign investors to analyze their differences in terms of performance, I researched determinants of such differences through questionnaire for the expert peers who had been involved in sale processes. For the case study analysis, 10 companies and 15 ones sold to foreigners and domestic investors were respectively adopted. As a result of analysis, the difference between the bidding price and contractual one, the outcomes of international negotiations were 21% lower than those of domestic ones.<BR> As a result of demonstrative research and analysis carried out with the assistance of 197 M&A experts, this study suggests some measures to enhance the outcome of negotiation for overseas corporate sale; avoiding deadline for sale, using financial advisors familiar with both cultures, normalizing targeted companies before sale, establishing an adequate rewarding system and strengthening negotiation ability through specialized training. Additionally, securing BANTA, solving internal conflicts, removing outside pressures and using walk-away strategy are also suggested.
궤양성 대장염의 임상경과 진단 첫해의 임상경과에 영향을 미치는 인자 및 5 년간 임상경과의 변화 양상
최창환(Chang Hwan Choi),정혜원(Hae Won Chung),이재훈(Jae Hoon Lee),박정엽(Jeong Youp Park),이현웅(Hyun Woong Lee),박영수(Young Soo Park),김태일(Tae Il Kim),김원호(Won Ho Kim) 대한소화기학회 2001 대한소화기학회지 Vol.38 No.3
Background/Aims: Previous reports on ulcerative colitis in Korea were mostly about clinical features at the time of diagnosis. In this study, we analyzed not only clinical features of Korean patients with ulcerative colitis at the time of diagnosis, but also clinical courses during 5 years after diagnosis. Methods: The yearly sum of monthly symptom scores (annual disease burden index, ADBI), annual symptomatic period, and clinical severity were evaluated during 5 years after diagnosis, and factors affecting the clinical courses during first year were also analyzed. Results: The averages of ADBI, symptomatic period, and the proportion of patients in remission during the first follow-up year were 5.8±4.4, 4.0±3.1 months, and 22.1%, Those were 3.7±4.1, 3.0±3.4 months, and 32.4%, during the fifth year. The average of ADBI during the second year was significantly higher in patients with high ADBI (>4) during the first year compared with that in patients with low ADBI (6.3±5.5 vs. 2.6±3.8, p<0.01). Conclusions: From these results, we can conclude that the clinical course of ulcerative colitis, assessed by ADBI and symptomatic period, tends to improve with time and the preceding clinical course is significantly correlated to subsequent course. (Korean J Gastroenterol 2001;38: 169-176)