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한재오,윤영활 강원대학교 조형예술연구소 2005 조형예술논문집 Vol.6 No.-
Jeongsa is a kind of building which is a learning place under the control of teacher for confucianism students, and it's often located at the Gok(曲) landscape which is a scene with appearance in a geographical landscape. The scholars established the Jeongsa to enjoy the beautiful mountain and water. For the purpose of avoiding social confusion neo-confucianists tended to seek the place for a secluded life. This schlor's behavior in Chosun imitated a habit such as the life style of Chu-Tzu(朱子) in Song dynasty, China. This Hwaeumdong Jeongsa as a place of seclusion and self-discipline was built by Soo-Jeung Kim(1624-1701) who was a neo-confucianist and a literary man in Chosun dynasty. He tried to embody confucian's outlook on the universe in his Jeongsa space, which adopted a factor of geographical landscape such as rock and stream. Hwaeumdong Jeongsa seems found to be the meaningful garden with symbolim, which could not easily in discovered the others in Chosun dynasty.
Development of Auxiliary Wheel Unit Mechanism for Overcoming Obstacles
한재오,염광욱 한국인터넷방송통신학회 2019 Journal of Advanced Smart Convergence Vol.8 No.2
Recently, the spread of personal mobility has been rapidly increasing due to the development of environmentally friendly alternative transportation means. In addition, the level of battery technology is also rapidly developing, accelerating the popularization of personal mobility. Such personal mobility has convenience of location transfer, amusement, and high portability compared to other transportation devices. Most personal mobility, however, is made up of small wheels, which cannot overcome obstacles such as rugged roads or obstacles on the road. In this paper, to solve these problems, we tried to devise a device that can easily overcome obstacles by combining wheels with small moving means. The wheel size can be mounted on the front wheel of the small moving means in a protruding manner so that obstacles can be encountered before the front wheels and the safety and ride comfort of the running can be improved
척추 나사 기구 때문에 생긴 흉부하행대동맥의 가성 대동맥류 - 치험 1예 -
한재오,최종범 대한흉부심장혈관외과학회 1999 Journal of Chest Surgery (J Chest Surg) Vol.32 No.9
이물질(foreign body)의 만성적인 자극은 혈관에 지연성 손상을 가져올 수 있다. 척추 측후만증을 교정하고 자 약 14개월 전에 흉추에 CD 금속강과 나사못(Cotrel-Dubousset rods and screws)을 장치했던 환자에서 CD 나사못의 만성적인 자극으로 흉벽의 박동성 혈종을 합병한 가성 대동맥류가 발생하였다. 이 환자에서 가성 대동맥류가 발생한 하행대동맥 부위를 절제하고 인조혈관 대치술로 치료하였기에 보고한다. Chronic irritation to arterial wall by foreign material may give rise to delayed vascular injury. A 50 years old male patient with kyphoscoliosis had undergone fixation of orthopedic Cotrel-Dubousset(CD) rods and screws. Fourteen months after that surgery, a false aneurysm of the descending thoracic aorta associated with pulsating hematoma in the muscular chest wall developed. The false aneurysm was managed by resecting the diseased aortic segment and replacing the vascular graft.
Synthesis and visible light photocatalytic activity of porous CeO2-TiO2 composite powders
한재길,고준빈,Sung-Min Choi,강인철 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
Porous CeO2-20 wt.%TiO2 composite powders having a homogeneous distribution and nanocrystalline were successfully synthesized by a sol-gel process using titanium iso-propoxide and Ce(NO3)3·6H2O as precursors. The particle sizes of the asreceived porous CeO2-20 wt.%TiO2 composite powders were measured in the range from 0.3 to 10 μm by SEM. As the calcination temperature was increased up to 1050 oC, the porous composite powders having pores ranging from 0.1 nm to 3 μm in pore size were obtained. The pore frames of CeO2-20 wt.%TiO2 composite powders were less than 500 nm thick and they were nanocrystalline with a dense structure. From a comparison of the photocatalytic activity, the porous CeO2-20 wt.%TiO2composite powders calcined at 900 oC showed an excellent efficiency for the removal of phenol under UV light. However, in the powders calcined at 600 oC, there was a relatively higher photocatalytic activity than that of other powders under visible light. Hence this sample had a strong edge band at a blue-green wavelength range.
마이크로파-수열 합성법을 이용한 나노 수산화아파타이트 합성과 특성평가
한재길,이치우,이병택,Han, Jae-Kil,Lee, Chi-Woo,Lee, Byong-Taek 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.2
Nano-sized hydroxyapatite (HAp) powders were synthesized by a microwave-hydrothermal method using $H_3PO_4\;and\;Ca(OH)_2$ as starting materials. The applied microwave powers and mole ratio of Ca/P were served as powerful factors in the synthesis of calcium phosphate. In the case of relatively low microwave power of 450 Wand Ca/P ratio of 1.57, the mixed calcium phosphate compounds were detected in the synthesized powders. But in the case of running at 550 Wand 1.67(Ca/P), the synthesized powder showed the monophase of HAp having two kinds of morphologies. One was a needle shape with $5\~15\;nm$ in width and $20\~50\;nm$ in length, and the other was a spherical shape of $10\~40\;nm$ in diameter.
모든 l × n, n × m, m × k 불리언 행렬의 곱셈 시간 개선에 관한 연구
한재일 ( Jae-il Han ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.1
대부분의 불리언 행렬에 대한 연구는 두 불리언 행렬의 곱셈에 초점을 두고 있으며 모든 불리언 행렬을 대상으로 한 곱셈에 대한 연구는 최근에야 극히 소수의 연구결과가 보이고 있다. 이 연구들은 모든 불리언 행렬 사이의 곱셈 실행시간을 개선시켰으나 연속된 세 개의 모든 l × n, n × m, m × k 불리언 행렬에 대한 곱셈은 아직 많은 개선이 필요하다. 본 논문은 모든 l × n, n × m, m × k 불리언행렬의 곱셈 실행시간을 보다 개선할 수 있는 이론을 제시하고 이를 적용한 불리언 행렬 연속곱셈의 실행결과에 대하여 논한다.
한재일 ( Jaeil Han ),정기용 ( Kiyong Jung ),성정욱 ( Jungwook Sung ),한창훈 ( Changhoon Han ),손영수 ( Youngsoo Son ),김영만 ( Youngman Kim ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
SaaS 환경에서는 다수의 사용자가 동일한 어플리케이션을 이용하게 되므로 사용자에 따라 특정 자원 혹은 기능에 대한 접근을 제어하는 보안 기능의 중요성이 더욱 부각되고 있다. 이러한 기능을 갖춘 SaaS 플랫폼의 중요성과 그 가치는 매우 크다 할 수 있으나 국내에서는 이에 대한 많은 연구가 보이지 않고 있다. 본 논문에서는 계층적 그룹 구조, 접속 시간·IP 주소·MAC ID 등에 따른 역할 부여 등 풍부한 기능을 제공하는 SaaS 플랫폼을 위한 사용자 권한 관리 시스템을 설계한다.