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농업기술 - 다가오는 환절기의 가축질병 어떻게 관리할까요?
정영훈,Jeong, Yeong-Hun 전국농업기술자협회 2010 농업기술회보 Vol.47 No.5
큰 일교차는 가축면역력 약화를 부른다. 낮과 밤의 일교차 약 $10^{\circ}C$ 전후의 환절기에는 면역력이 약한 어린 가축은 환경의 변화에 따른 대사불균형으로 질병 발생률이 높아진다. 가축에게 환경 스트레스를 낮춰주기 위해 아침 저녁으로 바깥의 찬공기에 노출되지 않도록 차단해야 하고 야간에는 축사보온, 낮에는 환기가 충분히 이루어지도록 해야 한다. 또한 양질의 사료공급은 물론 비타민, 광물질 등의 첨가제를 적절히 배합해 급여하고 호흡기 질병 및 설사병 등의 백신을 적기에 접종해 면역능력을 가질 수 있도록 해야 한다.
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 $31{\Omega}{\cdot}cm$.
자동차 주행 시뮬레이터의 운동감 재현 및 감성평가를 위한 감성어휘의 수집
정영훈,엄성숙,손권,최경현,Jeong, Yeong-Hun,Eom, Seong-Suk,Son, Gwon,Choe, Gyeong-Hyeon 대한인간공학회 2000 大韓人間工學會誌 Vol.19 No.2
Driving simulators have been developed for evaluating users' reaction to various driving situations. Dynamic simulators have, however, limitations of the motion feedback in space. Therefore, this paper presents a driving simulator and suggests a human sensibility ergonomics (kansei engineering) method to be used in improving sense of motion through a vehicle simulator. Human sensibility ergonomics(kansei engineering) is defined as translating technology of the customer' feeling about a new product into design elements. Constituents of the simulator were defined and the virtual world was generated by the object modeling technique. Senses perceived were classified into feelings of velocity, acceleration, rotation, and vibration based on the human sensibility associated with driving. And the most frequent verbal expressions were collected from 17 male subjects to define complex human sensibility.