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이혁기,조재훈,이성락,강동기,김상철,김용선,Lee, Hyuk Gi,Cho, Jae Hoon,Lee, Sung Lak,Kang, Dong Gee,Kim, Sang Chul,Kim, Yong Sun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.2
Posterior transarticular screw fixation for atlantoaxial instability due to trauma or rheumatoid arthritis provides immediate rigid fixation of the C1-2 vertebral segment while preserving motion between the occiput and C1. This technique provides more resistance to translational and rotational forces than wiring technique. However, the technique of transarticular screw fixation is inherently demanding because of the complex anatomy of the occipitocervical region and vertebral artery(VA) at risk for arterial damage. VA injury may lead to serious subsequent neurological deficits and possibly death from bilateral VA injury. We report a case of a vertebral artery-to-epidural venous plexus fistula after posterior transarticular screw fixation which was treated with balloon occlusion.
Willis환 내 뇌동맥류 진단시 전산화단층촬영 뇌혈관 조영술의 유용성
이혁기,조재훈,이성락,강동기,김상철,Lee, Hyuk Gi,Cho, Jae Hoon,Lee, Sung Lak,Kang, Dong Gee,Kim, Sang Chul 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.3
Objective : The purpose of this study was to compare computed tomographic angiography(CTA) with conventional cerebral angiography(CCA) and to assess usefulness of CTA in detection and anatomic definition of intracranial aneurysms of the circle of Willis in subarachnoid hemorrhage. Patients and Methods : Fifty consecutive patients with known or suspected intracranial saccular aneurysms underwent CTA with preoperative CCA from 1997 to 1999. Using surface shaded display post-processing technique, CTA was interpreted for the presence, location of aneurysms and anatomic features. The image obtained with CTA was then compared with CCA image. Results : In 47 patients, CCA revealed 57 cerebral aneurysms and CTA revealed 54 aneurysms. Two of the 57 cerebral aneurysms were located outside of the imaging volume of CTA and one case was misdiagnosed. The sensitivity of CTA was 94.7% and the specificity was 100%. The results obtained with CTA were, compared with the results obtained with CCA, equal in determining dome shape, direction and lobularity. However, CTA provided a 3-dimensional representation of aneurysmal lesion very useful for surgical planning. Moreover, CTA was useful for rapid and relatively noninvasive detection of aneurysms in the circle of Willis. Conclusion : CTA can be a diagnostic tool for the patients with acute subarachnoid hemorrhage due to a ruptured aneurysm of the circle of Willis and provides adequate anatomic detail for surgical planning, especially to complex cerebral aneurysms. However, we think CCA is necessary because of CTA limitations including its difficulty in detecting unusually located aneurysms(including those in cavernous sinus or distal artery) and combined vascular lesion (including arteriovenous malformation) and acquiring dynamic flow information.
이혁기(Hyuckkee Lee),한종연(Jongyeon Han),연규봉(Kyubong Yeon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In recent years there has been increasing public awareness about the impact of tire pressure levels on vehicle safety. Early warning of such safety related information could help a driver to avoid a potentially hazardous driving condition. This paper provides an overview on the state of the art of intelligent tyre systems and potential technologies that can be utilized for sensors, wireless data transmission, and batteryless power supply. ESPm requires more often transmission of tire information to control vehicle stability. This will show test & measurement method of ESPm system
HVI를 위한 Head-Up Display 시스템 연구
이혁기(Hyuck Kee Lee),양인범(In Beom Yang) 대한인간공학회 2009 대한인간공학회 학술대회논문집 Vol.2009 No.11
Today, Intelligent vehicles requires new visual display system to provide much information of nomadic devices and ADAS. Too many convenient systems produce much information to be processed but it can cause driver distraction. Head-up Display is a good device to display visual information safely. This paper describes the development of Head-up Display and its application technology to vehicles and deals with problems of the developed Head-up Display and remaining technology issues.
이혁기 ( Hyuck Ki Lee ),왕용덕 ( Yong Duck Wang ),노재훈 ( Jae Hoon Noh ) 고려대학교 스포츠과학연구소 2010 스포츠科學論叢 Vol.16 No.-
본 연구는 교양골프 수업의 효율성을 높이기 위하여 골프 학습자의 인지학습능력을 향상을 통하여 골프 스윙 능력을 향상하는데 목적이 있다. 교양골프 수업의 경우, 시간과 공간의 제약이 있고, 학생들의 수업 참여 동기에도 차이가 있기 때문에 학습자 중심의 골프 교수를 통한 접근이 필요하다. 이를 위해 본 연구에서는 무선 표집된 33명의 골프경험이 없는 대학생을 대상으로, SPSS WIN Ver.12.0을 이용하여 통계분석을 실시하였다. 학습자 스스로 골프 스윙을 분석하고 평가하여 적용할 수 있는 방법, 즉 학습자의 인지적 측면을 이끌어 낼 수 있는 방법을 골프 수업에 적용함으로서, 인지학습능력을 유도 할 수 있는 이끌어내기, 설명하기, 메타언어적 피드백, 반복의 기법을 사용한 골프 수업의 결과, 학습자들의 인지전략과, 메타인지전략의 사용이 높아지고, 이를 통한 골프스윙 능력 향상에도 도움이 됨을 확인하였다. This study aims to explore the relation of learners`cognitive competence to golf capability. The study is designed from the belief that cognitive competence would facilitate the physical activities such as golf swing. It is also related to the current issue, the college program for golf studies, which is different from the program for professional or amateur golfers and pastime players, requires other training program. Therefore, the modified program for college amateur golf players is requested. Regarding the belief in the learners` cognitive competence as for the learner-centered approach, the study conducted I5-week golf instructions for 33 novice college golf players and emphasized on the cognitive strategies to initiate learners` cognitive competence. In the result, the experimental group with the cognitive strategies such as elicitation, repetition, clarification request, and feedback, showed the better performance in golf swing than the group with traditional golf instruction such as presentation and simulation.
이혁기(Hyuck-kee Lee),황윤형(Yunhyoung Hwang),양인범(Inbeom Yang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Recently, many researches were performed to enhance fuel efficiency using GPS and ITS information. Green Drive means Driver Assistance System that use Map and Traffic information to drive a car in efficient and safe state. It consists of driver coaching system, energy management system and green routing. This paper deals with the evaluation environment of Green Drive System in simulated virtual driving environment. Main purpose of that is to quantitatively test green drive components in a point of view of fuel efficiency. We developed a DHIL(Driver Hardware-In-the-Loop) simulator that can be used in virtual driving and a HILS system to operate the DHIL simulator. Several scenarios of green driving are also described briefly.