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경량압축기용 Mg합금 구동스크롤 적용을 위한 정적 유한요소해석
정기호,이근안,이형욱,Jung, Ki Ho,Lee, Guen An,Lee, Hyung Wook 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.1
최근 유가상승 및 환경오염으로 인하여 자동차 연비 개선에 대한 관심이 날로 증가하고 있어 자동차 제조사들은 다양한 접근방법을 통해 경량화를 달성하고자 하고 있다. 경량화 방법으로는 경량재료의 적용, 고강도 소재를 이용한 부품소형화, 조립식 파트의 일체형 모듈화 등이 있으며, 본 연구에서는 경량구조재료인 마그네슘 합금을 자동차용 스크롤 압축기에 적용하기 위하여 기존 알루미늄 합금부품과의 열팽창 및 열변형의 비교를 통해 마그네슘 합금 적용한 스크롤 부품의 설계시 고려되어야 할 요소들을 분석 및 제시하고자 한다.
정기호 ( Ki Ho Jung ),정신 ( Shin Jung ),김재휴 ( Jae Hyoo Kim ),강삼석 ( Sam Suk Kang ) 대한뇌종양학회 2003 대한뇌종양학회지 Vol.2 No.1
Skull base tumors pepresent technically formidable to neurosurgeonsm, due to their proximity to adjacent vital structures, and deep and narrow operative field in the surrounding compact bony structure. We introduce technique of image-guided syrgery and usefulness of neuronavigation system in skull base tumors. Butween February 2000 and January 2003, 27 patiens(four males and twenty three females with mean age of 53.29), harboring skull base tumors underwent surgery using the neuronavigation system in our department. Preoperative scans for registration to neuronavigation system were magnetic resonance image in three cases and computed tomography in the ohers. The mean accuracy in neuronavigation system and volume of skull base tumors were 1.2mm and 32.08cc respectively. Gross total removal was accomplished in twenty four(89%) cases and incomplete removal in three(11%). The causes of incomplete removal included cavernous sinus invasion in one case, and severe adhesion to the brain stem or cranial nerve in two. The locations of tumor were sphenoidal in 8 cases, cerebellopontine angle in 5 cases, perroclival in 5 cases, tentorial region in 4 cases, olfactory groove in 2 cases, and parasellar region in 3 cases. The surgical pathology included 21 meningiomas, 5 schwannomas, and a chordoma. Neuronavigation system in skull base tumors has advantage of not only planning of trajectory, safe intratu-moral decompression, but also identification of tumor localization and adjacent vital structure, because brain shifting by CSF drainage or craniotomy can be negligible during operation.
실내 환경에서 RFID와 초음파를 이용한 이동로봇의 위치 추정에 관한 연구
정기호(Ki-Ho Jung),장철웅(Chul-Woong Jang),강신혁(Shin-Hyuk Kang),이동광(Dong-Kwang Lee),염문진,장문석(Mun-Suck Jang),공정식(Jung-Shik Kong),권오상(Oh-Sang Kwon),이응혁(Eung-Hyeok Lee) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
In this paper we analyze whether recent Radio Frequence Identification technology can be used to improve the localization of mobile robot in their environment. This system make use of power control because Tag with Reader distance measurement. We are accurately the low at former time than the environment. A distance measurement is rather correct. This system used 900㎒ Frequencies.