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정영훈,박용준,이미재,이영진,백종후,최진수,이우영,Jeong, Young-Hun,Park, Yong-Jun,Lee, Mi-Jae,Lee, Young-Jin,Paik, Jong-Hoo,Choi, Jin-Soo,Lee, Woo-Young 한국재료학회 2008 한국재료학회지 Vol.18 No.9
Positive temperature coefficient of resistivity (PTCR) characteristics of (1-x)$BaTiO_3-x(Bi_{0.5}K_{0.5})TiO_3$ ceramics doped with $Nb_2O_5$ were investigated in order to develop the Pb-free PTC thermistor available at high temperatures of > $120^{\circ}C$. The PTCR characteristics appearing in the ($B_{i0.5}K_{i0.5})TiO_3$ (< 5 mol%) incorporated $BaTiO_3$ ceramics, which might be mainly due to $Bi^{+3}$ ions substituting for $Ba^{+2}$ sites. The 0.99$BaTiO_3-0.01(Bi_{0.5}K_{0.5})TiO_3$ ceramics showed good PTCR characteristics of a low resistivity at room temperature (${\rho}_r$) of $31{\Omega}{\cdot}cm$ a high ${\rho}_{max}/{\rho}_{min}$ ratio of $5.38{\times}10^3$, and a high resistivity temperature factor (${\alpha}$) of $17.8%/^{\circ}C$. The addition of $Nb_2O_5$ to 0.99$BaTiO_3-0.01(Bi_{0.5}K_{0.5})TiO_3$ ceramics further improved the PTCR characteristics. Especially, 0.025 mol% $Nb_2O_5$ doped 0.99$BaTiO_3-0.01(Bi_{0.5}K_{0.5})TiO_3$ ceramics exhibited a significantly increased ${\rho}_{max}/{\rho}_{min}$ ratio of $8.7{\times}10^3$ and a high ${\alpha}$ of $18.6%/^{\circ}C$, along with a high $T_c$ of $148^{\circ}C$ despite a slightly increased ${\rho}_r$ of $31{\Omega}{\cdot}cm$.
연골 조직 재생을 위한 나노섬유/알지네이트 복합 재료 스캐폴드의 제작
장진아(Jinah Jang),이종완(Jongwan Lee),설영준(Yeong-Joon Seol),정영훈(Young Hun Jeong),조동우(Dong-Woo Cho) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Three-dimensionally polycaprolactone(PCL) nanofiber reinforced alginate hydrogel scaffold were fabricated for the regeneration of functional cartilage construct with G-glucono-δ-lactone(GDL) cross linker that was applied to alginate hydrogel crosslinking with calcium carbonate (CaCO<SUB>3</SUB>) to maintain its structural integrity. In order to analyze new types of PCL nanofiber/alginate gel composite scaffold, four kinds of PCL nanofiber/alginate hydrogel composite scaffold were fabricated depends on the amount of nanofiber using dual-nozzle electrospinning process. Young’s moduli of each composite scaffolds were increased better than alginate only structure, also its value nearly approached normal articular cartilage. In conclusion, these results indicate feasibility of the new type of functional scaffold for cartilage regeneration from PCL nanofiber/alginate hydrogel composite scaffold.
정영훈(Jeong, Young-Hun) 고조선단군학회 2018 고조선단군학 Vol.39 No.-
안호상은 이승만정부에서 초대 문교부장관을 역임한 인물이다. 그는 단군민족주의로부터의 큰 영향속에 학문과 실천운동을 전개한 대표적인 인물이라 할 수 있다. 특히 단군민족주의의 종교방면 전개라 할 수 있는 대종교와의 인연이 중요한데, 그는 청년기에 대종교에 입교하였고 노년기에는 교단의 최고 수장 직도 수행했었다. 이 논문에서는 안호상의 활동노선과 학문연구 및 일민주의 정치이론을 단군민족주의와의 관련속에서 분석하였다. 논문에서 다루고 있는 문제는 다음과 같은 3가지이다. 첫째, 안호상의 활동과 사상을 단군민족주의와의 관련 속에 검토하고자 하였다. 그가 단군민족주의자가 된 과정과 단군민족주의의 실천과 활성화를 위해 힘쓴 내역을 살폈다. 둘째, 안호상의 일민주의를 특히 단군민족주의와 연계속에 살피고자 하였다. 단군민족주의가 발굴한 자료들에 기초하였고 단군민족주의적 민족적 공동운명론을 정책적으로 구체화하였음을 밝혔다. 셋째, 안호상의 단군민족주의를 평가해보고자 하였다. 논문에서는 안호상의 사상과 학문을 전체주의・국가주의・파시즘・유사역사학이라고 매도하기만 하는 것은 부적절하다는 점을 지적하였다. 그가 전개하는 민족적 공동운명체론은, 개인자유주의를 넘어서 공동체적 통합과 행복으로 나아가는 사상적 대안으로서 나름의 의미를 갖는다고 보았다. 중독・왜독・양독의 삼독극복론과 연구성과들 역시 우리의 학술연구 자세에 대해 반성하게 하고 역사와 문화에 대한 상상력을 보강해준다. 그러나 반공 노선과 대한민국 국가를 민족・단군・통일 등과 같은 가치・과제보다 우선시한 것이나, 전쟁 및 좌우대결 과정에 빚어진 민족적 희생과 이승만의 독재권력 강화에 대해 침묵한 것은 단군민족주의의 기본지향에서 이탈한 것이라 할 수 있다. 그리고 위대한 민족사에 대해 과도하게 집착하면서 과학적 엄밀성에서 후퇴한 것 역시 신채호가 정립했던 단군민족주의적 국학정신으로부터 크게 퇴보한 것이라 평가하였다. AhnHoSang was the first minister of the Ministry of Education of Lee Seung-man Government. He was a representative figure who was influenced by Dangun-nationalism in academic and practice movement. He joined Daejonggyo, the religious development of Dangun-nationalism, in his youth and carried out the presidency of Daejonggyo in his last years. Ilminism, AhnHoSang’s political theory was the ideology which was expressed with the socio-political idea of Dangun-nationalism. This paper deals with following 3 problems. (1) What were the relevancies between AhnHoSang and Dangun-nationalism? And how did he endeavor to consolidate the Dangun-nationalism? (2) What correlations were between Ilminism and Dangun-nationalism? And how were the idea of national common destiny embodied in Ilminism? (3) Is it proper to evaluate Ilminism as totalitarianism, statism, fascism and dictatorship? If not why?
마이크로 EDM 드릴링 공정에서의 전극 마모 및 가공 형상 예측
정영훈(Young Hun Jeong),허세곤(Se Gon Heo),민병권(Byung-Kwon Min),이상조(Sang Jo Lee) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Micro EDM process is a most appropriate machining process for micro metal hole fabrication. However, EDM process has a difficulty in machining accurately because of electrode wear. In this paper a two-dimensional geometric simulation model of micro EDM drilling with cylindrical electrode is proposed. The developed model is based on two-dimensional matrix which can represent the transversal crosssection geometries of electrode and workpiece. Electrode wear which drastically influences the machined geometry of workpiece is geometrically considered to accurately predict the electrode and workpiece geometries. As a result, the electrode geometry influenced by end and comer wear as well as machined hole geometry in workpiece can be predicted using the developed simulation model.
정영훈(Young Hun Jeong),정승원(Seung Won Jung),윤원수(Won Soo Yun),진송완(Songwan Jin),박철우(Cheol Woo Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In this study a sensor for parallelism measurement for a bonding process was developed. To measure the inclination angle between two planes, four flexures based on leaf spring was introduced to the sensor design and the bending strains of four flexures were used in the estimation of inclination angles which were roll and pitch. Consequently, it was demonstrated that the estimation accuracy of the inclination angles could be improved to be three-times higher than that of prescale pressure film in existing method.
정영훈 ( Young Hun Jeong ),엄성숙 ( Sung Suk Eom ),손권 ( Kwon Son ),최경현 ( Koung Hyun Choi ) 한국감성과학회 1999 추계학술대회 Vol.1999 No.-
This research has been focussed on the evaluation of the driving speed in a graphic environment. Through the investigation of some electronic driving games, two factors related to perceived speed have been extracted. The two factors are distance and density of objects. Experiments have been executed for the two factors. The experiment is needed to acquire a relationship between speed perception and each factor. For experiments involving more than ten subjects, graphical representation of a vehicle and its surrounding environment has been obtained using three-dimensional tools, Pro/ENGINEER and dVISE. Based on the experimental results, relationships are formulated and plotted.