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Investigation of the electrical and optical properties of InAs/InGaAs dot in a well solar cell
Lee, S.H.,Han, I.S.,Sohn, C.W.,Jo, H.J.,Kim, J.S.,Lee, S.J.,Noh, S.K.,Kim, J.O. Elsevier 2015 Current Applied Physics Vol.15 No.11
The electroreflectance (ER) and current-voltage (J-V) of InAs/InGaAs dots in a well (DWELL) solar cell (SC) were measured to examine the optical and electrical properties. To investigate the carrier capturing and escaping effects in the quantum dot (QD) states the above and below optical biases of the GaAs band gap were used. In the reverse bias region of the J-V curve, the tunneling effect in the QD states was observed at low temperature. The ideality factors (n) were calculated from the J-V curves taken from various optical bias intensities (I<SUB>ex</SUB>). The changes in the ideality factor (n) and short circuit current (J<SUB>SC</SUB>) were attributed mainly to carrier capture at low temperature, whereas the carrier escaping effect was dominant at room temperature. ER measurements revealed a decrease in the junction electric field (F<SUB>J</SUB>) due to the photovoltaic effect, which was independent of the optical bias source at the same temperature. At low temperature, the reduction of photovoltaic effect could be explained by the enhancement carrier capturing effect due to the strong carrier confinement in QDs.
조선업 용접공진폐증에서 용접 흄 폭로력에 따른 방사선소견과 폐기능검사소견의 비교연구
손혜숙,김성준,김정호,이채언,정귀원,조규일,전진호,배기택 大韓産業醫學會 1991 대한직업환경의학회지 Vol.3 No.2
By the state of exposure to welding fume, the radiographic findings of 31 shipyard welders diagnosed as pneumoconiosis and pulmonary function were evaluated. Subjects were divided into three groups by the state of exposure to welding fumes i.e. Group Ⅰ- complete job replacement after detection of pneumoconiosis. Group Ⅱ- incomplete job replacement. Group Ⅲ- no job replacement. The results were as follows ; 1. Radiographic findings had a difference among three groups- GroupⅠ(complete job replacement). Group Ⅱ (incomplete job replacement). Group Ⅲ (no job replacement)(P<0.05), but pulmonary function had no difference. 2. Pulmonary function was not significantly different in diagnostic radiographic findings-normal, suspected pnemoconiosis, simple pnemoconiosis. 3. VC and FVC decreased with increasing age and total exposure duration to welding fumes. And FEV₁decreased with increasing exposure duration. 4. In welders exposed to welding fumes over 20 years, all performed pulmonary functions (VC, FVC, FEV, MMF, FEF75%) recorded by observed/predicted ratio were less than 80%. Based on the above results, the radiographic abnormal findings improved if job replaces but pulmonary function was not significantly different among three groups- GroupⅠ, Group Ⅱ, Group Ⅲ. So it is thought that job replacement and continuous observation on radiographic findings and pulmonary function is useful for control of pneumoconiosis of shipyard welders.
만난올리고당과 단백질 수준이 21 일령 이유자돈의 성장 및 면역상태에 미치는 영향
손광수,한인규,김진동,현영,김태중,우희종 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.4
This experiment was conducted to investigate the effect of mannanoligosaccharide as an immunostimulator with different protein levels on the growth performance, proximate nutrient digestibilities, apparent amino acid digestibilities and immune status in pigs weaned at 21 days old. One hundred-fifty three way crossbred (Landrace x Large White x Duroc) pigs averaged 6.08kg of body weight, and weaned at 21 days of age were assigned to six treatments by a 2 x 3 factorial arrangement [two level of MOS (0 and 0.1%) and three level of protein (20%, 23% and 26%)]. Each treatment has 5 replicates with 5 pigs per replicate. The pen is an experimental unit. Pigs fed diet with MOS had improved weight gain and feed consumption (p$lt;0.05) during the entire period, however, the protein level did not improved growth performance, and no interaction between the protein and MOS levels was observed. Although there was no significant difference, pigs fed the diet with high (26%) or medium (23%) protein showed better average daily gain (ADG) and feed efficiency than pigs fed diet with low (20%) protein regardless of MOS addition. The protein level did not affected the nutrient digestibilities of experimental diets. And, also, there was no interaction between protein level and MOS addition in digestibilities. Only dry matter digestibility was significantly higher in pigs fed the diet with MOS than pigs fed diet without MOS (p$lt;0.05). There was no main effect of protein level and MOS addition, and no interaction effect between protein level and MOS addition in essential and non-essential amino acid digestibilities. Protein level or MOS addition did not affected immune parameters in pigs. Additionally, no interaction effect on immune parameters was observed between protein level and MOS addition. However, pigs fed diet with the medium (23%) protein showed lower CD4+:CD8+ ratio than pigs fed other diets regardless of MOS addition, and pigs fed diets with the MOS showed low immune status such as low CD4 positive lymphocytes, high CD8 positive lymphocytes, low CD4+:CD8+ ratio during the overall period without considering protein level. In conclusion, the pigs fed diets with the immunostimulator like MOS improved growth performance and maintained low immune system when compared to pigs fed diets without the MOS. However, there was no significant difference in growth performance and immune status between protein levels.
崔埈赫,李秉柱,元哲昊,具成謨,金明南,金昶秀,孫炳基,曺辰鎬 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Electrolyte analyzer is one of widely used instrument in the hospitals and laboratories. In this paper, a desktop electrolyte analyzer which can detect and display both ion concentrations of hydrogen and sodium in the solution using ISFET is developed. We designed hardware of the system including signal-processing circuit for multiple sensor and flow system consist of a sample chamber unit and 12 actuators. For the efficient control of the system, 2-point calibration, measurement and washing algorithms are also developed. We compare the pH, pNa values measured by the developed system with those measured by reference system and verified the performance.
Pore formation in in situ processed MgB<sub>2</sub> superconductors
Yi, J.H.,Kim, K.T.,Jun, B.H.,Sohn, J.M.,Kim, B.G.,Joo, J.,Kim, C.J. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
MgB<SUB>2</SUB> bulks were prepared by an in situ process which utilizes the reaction between boron and magnesium powder. The reaction time was fixed at 0.5h and the temperature was changed from 600<SUP>o</SUP>C to 1000<SUP>o</SUP>C. The density decrease due to pore formation and mass (mainly magnesium) loss during the formation reaction of MgB<SUB>2</SUB> was observed in all samples. In addition to the pore formation, a pellet expansion which can be explained by the outgrowth of MgB<SUB>2</SUB> grains was also observed. Two different mechanisms were adopted to explain the pore formation; Kirkendall pores formed at a temperature below the melting point (m.p.) of magnesium by a difference in the diffusivity between magnesium and boron, and the pores formed at a temperature above the m.p. by melting of magnesium and a capillary movement. The density, T<SUB>c</SUB> and J<SUB>c</SUB> results suggest that the current carrying capacity can be improved by a careful control of the process parameters regarding a pore evolution.