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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.
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.
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.
태권도 지식검사의 정보매체에 따른 차별적 문항기능검증: 멀티미디어 및 지필검사의 다언어 집단비교
최창환(Chang Hwan Choi),박재현(Jae Hyeon Park),이재봉(Jae Bong Lee),이미영(Mi Young Lee),김혜진(Hyeoi Jin Kim) 한국체육측정평가학회 2012 한국체육측정평가학회지 Vol.14 No.1
이 연구는 최창환, 이재봉, 박재현, & 김혜진(2010)의 후속연구로써 다언어로 개발된 지필형 검사와 멀티미디어형 검사의 차별적으로 기능하는 문항을 추출하여 그 특성을 분석함으로써 검사정보매체들이 갖는 고유한 측정학적 특성을 확인함을 목적으로 수행되었다. 이 목적을 위하여 한국의 서울, 경기지역 90명과 미국의 로스엔젤레스 지역 99명, 총 189명의 태권도 유단자를 대상으로 최창환 등(2010)이 개발한 지필형 그리고 멀티미디어형 태권도 지식검사를 실시하였다. 검사정보매체에 따른 측정학적 특성을 분석하고자 기술통계와 차별적 기능문항(differential item functioning : DIF)을 산출하였으며, DIF 추출방법을 위해 Mantel-Haenszel 방법을 적용하였다. 기술통계치 산출과 차별적 기능문항을 추출하기 위하여 R 통계 프로그램(package-``dif-R``, 2.13. ver)을 활용하였다. 분석결과, 총 80개의 태권도 지식검사 문항에서 아홉 개의 차별기능문항이 추출되었다. 추출된 아홉 개 문항 중 여섯 개 문항이 지필형에서 추출되었으며, 세 개 문항은 멀티미디어형에서 추출되었다. 지필형 검사에서 추출된 여섯 개 문항은 모두 한국 태권도 유단자들에게 유리하게 기능하는 문항으로 나타나 멀티미디어형 검사가 언어에 따른 문항의 편파성을 줄일 수 있는 것으로 확인되었다. 또한 차별적 문항으로 추출된 지필형 여섯 개 문항은 대부분 문항의 지문이 길게 구성된 특징을 가지고 있었다. 이는 언어 문화권이 다른 집단에게 번안된 검사를 수행할 때 지필형 검사보다 멀티미디어형 검사가 유용할 수 있음을 시사한다. 결론적으로 멀티미디어형 정보매체가 체육 및 스포츠영역에서 요구하는 지식을 측정할 때, 문항이 가지고 있는 정보의 전달이 명확할 뿐 아니라 다언어 집단을 대상으로 측정하고자 할 때 검사의 편파성을 줄일 수 있는 것으로 요약할 수 있다. The knowledge tests using multimedia contents have been successfully applied in many areas such as education, medicine, or technology. Despite there are a lot of advantages using multimedia contents for testing of knowledge in physical education or sports performance setting, the tests based on paper and pencil are widely used in the physical education and sports. Choi, Park, Lee and Kim(2010) developed a knowledge test program for Taekwondo based on multimedia contents(MC) and paper contents(PC) in Korean and translated into English ver. When being translated into different languages, the measurement equivalence of the adapted instrument should be assessed, because the original translated instruments may not be equivalent. The purpose of this study is to identify the differential item functioning(DIF) of the Taekwondo knowledge test. For this study, a total of 189 taekwondo trainees from Seoul area in Korea and California area in USA(KOR : 90 trainee, USA : 99 trainee). A 80 items for taekwondo knowledge were developed with equivalent form(40 items for MC and PC, respectively) and obtained content validity evidence by experts of taekwondo and measurement specialists. All of the items were classified into one of four sub-domains of taekwondo(basic motion, kyorugi, poomsae, and demonstration of taekwondo). One of the statistic methods for differential item functioning was Mantel-Haenszel(Holland & Thayer, 1988) based on differential item functioning. and the R computer program(package of "dif-R", 2.13. ver) was used as data analysis. As a result, 9 items(PC : 3, 5, 12, 18, 31, 34 and MC : 6, 7, 22) were showed statistically significant of differential item functioning(p<.05). 6 items of PC(3, 5, 12, 18, 31, 34) and 1 item of MC(no.22) test were in favor of Korean and 2 items of MC(6, 7) test were in favor of American Taekwondo trainees(p<.05).
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.