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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.
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.
한재오(Jae-Oh Han),이수영(Soo-Young Lee),유승훈(Seung-Hun Yu),이재권(Jai-Kwon Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper was a study about noise reduction through flow stabilization in duct using experimental method and numerical analysis at the same time. To determine the fan's type three kinds of fans(axial fan, centrifugal fan, and axial fan with centrifugal type blades) was examined to investigate the suitability for in-line duct. As a result, under the equal number of rotation 2000 RPM, performance of an axial fan with centrifugal type blades was the most superior by 55㏈A at 4.3CMM among other fans. After this, analyzed the results of the numerical analysis to find out the optimum design of pitch angle such as 0°, 10°, 15° and 20°. The intensity of turbulence was low when pitch angle was 15° and air volume became peak by 5.08 CMM. It was observed that axis component of velocity increased gradually when pitch angle increased from 0° to 20°, and embodied noise reduction and improvement of air flow rate through flow stabilization.
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.
스위칭 회로를 이용한 electromagnetic launcher의 동작특성에 관한 연구 (pp.595-596)
한재만(Jae Man Han),주성중(Sung Joong Joo),조지웅(Ji Ung Jo),이만성(Man Sung Lee),박동석(Dong Suk Park),박제욱(Je Uk Park),변종혁(Jong-Hyuk Byun),김동석(Dong Sok Kim),박관수(Gwan Soo Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Electro-magnetic launcher(EML)는 전자기력을 이용하여 발사체를 추진시키는 장치이다. EML은 크게 레일건의 형태와 코일건의 형태로 구분되며, 본 논문에서는 코일건의 형태로 설계, 제작하였다. 코일건의 형태인 EML은 솔레노이드에 여자되는 전류에 의해서 발사체에 흡인력이 발생하여 추진, 가속되므로 솔레노이드의 최적형태를 설계하고, 이를 바탕으로 제작하여 EML의 스위칭 시간에 따른 속도를 측정하여, 여자전류의 스위칭 시간에 따른 동작특성을 해석, 실험하여 분석하였다.
CaAl<sub>2</sub>O<sub>4</sub>-CaAl<sub>4</sub>O<sub>7</sub>의 비율에 따른 시멘트 모르타르의 물리, 화학적 특성에 대한 연구
한재도 ( Han Jae-doh ),이한승 ( Lee Han-seung ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
콘크리트 내에서 염소이온을 고정 및 침투 억제할 수 있는 CA계 클링커의 상호간의 영향을 파악하기 위하여 CA(CaAl<sub>2</sub>O<sub>4</sub>)와 CA<sub>2</sub>(CaAl<sub>4</sub>O<sub>7</sub>)을 혼입하여 실험체를 제작하였다. 실험수준은 W/C 50%로 28일간 수중양생 진행되었고 클링커는 시멘트 중량대비 10%로 설정되었다. 평가결과 CA의 혼입율이 증가 할수록 초결이 빨랐지만 장기강도 발현이 감소했고, 시멘트 매트릭스 내부 공긍률이 증가했다. XRD분석결과 CA계 클링커를 혼입한 실험체에서 하이드로 칼루마이트 생성이 증가 한 것으로 보아 염소이온고정능력이 향상될 것 이라고 판단된다