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참돔(Pagrus major) Interleunkin 7 receptor alpha chain (IL-7Rα) 유전자의 분자유전학적 특성 및 발현분석
손민영(Min-Young SON),최광민(Kwang-Min CHOI),주민수(Min-Soo JOO),박찬일(Chan-Il PARK) 한국수산해양교육학회 2020 水産海洋敎育硏究 Vol.32 No.2
When a wound is infected by bacteria, macrophages recognize bacteria and release interleukin 7 receptor alpha chain (IL-7Rα). IL-7Rα released at this time activates T cells and releases IL and other similar proteins to activate various immune cells to remove bacteria. We described the molecular characteristics of PmIL-7Rα identified in red sea bream through NGS analysis and observed the tissue-specific expression of PmIL-7Rα. As a result, PmIL-7Rα showed the highest expression in the spleen among the tissues used in the experiment, and significant expression changes in the gills and kidneys after pathogen infection. We therefore believe that PmIL-7Rα plays an important role in the red sea breams immune system.
Determination of Trace Amounts of Nickel(II) with ${\alpha}-(2-Benzimidazolyl))-{\alpha}'{\alpha}$
박찬일,김현수,차기원,Park, Chan Il,Kim, Hyeon Su,Cha, Gi Won Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.5
A method is described for the fluorimetric determination of nickel, based on the formation of $Ni(II)-\alpha-(2-Benzimidazolyl)-\alpha'$, $\alpha''$ -(N-5-Nitro-2-Pyridylhydrazone)-toluene complex in the presence of a non-ionic surfactant. The complex has practically no fluorescence in the absence of surfactant, but the addition of Triton X-100 makes possible the fluorimetric determination of low concentrations of Ni(II) as it enhances the fluorescenceintensity of the complex by up to about 5-fold. This method is very sensitive and selectrive for the direct determination of nickel ion. The optimum conditions are a Triton X-100 concentration of 2.0 mL(5.0%, v/v) and pH $9.0\pm0.2(ammonium$ chloride-ammonia buffer). The fluorescence is measured at 337 nm of emission wavelength under 300 nm of excitation wavelength. The fluorescence intensity is a linear function of the concentration of Ni(II) in the range 5-70 ng/mL, and the detection limit is 2.0 nm/mL. The proposed method has been successfully applied to the determination of trace amounts of Ni(II) in food and human hair samples.
박찬일,이장무,Park, Chan-Il,Lee, Jang-Moo 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.5
Gear vibration is caused by the mesh stiffness, gear accuracy, and assembling errors. For these reasons, helical gear has the azial, radial, and rotational vibrations. In this study, the mesh stiffness is calculated by considering the tooth bending, contact, and foundation deformations. Rotational vibration of helical gear with tooth error is modeled by the nonlidear equation of motion with single degree of freedom and is anlyzed numerically. Also, by a specially designed experimental set-up, the analysis are cross-checked and the vibration characteristics of helical gear are discussed.
태양전지 응용을 위한 ZnO:Al 박막의 전기적·물리적 특성에서 증착 온도의 영향
박찬일,Park, Chan Il 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.1
In the case of ZnO:Al thin films, it is the best material that can replace ITO that is mainly used as a transparent electrode in electronic devices such as solar cells and flat-panel displays. In this study, ZnO:Al films were fabricated by using the RF dual magnetron sputtering method at various substrate temperatures. As the substrate temperature increased, the crystallinity of the ZnO:Al thin films was improved, and the electrical conductivity and electrical properties of the thin film improved owing to the increase in grain size. In addition, the surface roughness of the ZnO:Al thin films increased due to changes in the surface and density of the thin films. Moreover, the substrate temperature increased the density of thin films and improved their transmittance. To be applied to solar cells and other several electronic devices in the future, the hardness and adhesion properties of the thin film improve as the substrate temperature increases.
박찬일,정영철,차기원,Park, Chan-Il,Jung, Young-Chul,Cha, Ki-Won 한국분석과학회 2000 분석과학 Vol.13 No.1
2-Hydroxybenzaldehyde-5-nitro-pyridylhydrazone (2HB-5NPH)를 합성하여 계면활성제 하에서 바나듐 이온(IV)의 분광학적 정량에 응용하였다. pH, 용매효과, 리간드 농도와 계면활성제의 최적조건을 구하였다. 이 과정을 혼합 시료와 실제 시료 중의 바나듐(IV) 정량에 적용하여 만족한 결과를 얻었다(회수율 ${\geq}$ 97% ; $0{\sim}1.5{\mu}g/mL$ 농도 범위에서 상대 표준 편차 ${\leq}$ 3.0% ; 용액중에서 검출 한계 $0.02{\mu}g/mL$). 2-Hydroxybenzaldehyde-5-Nitro-pyridylhydrazone (2HB-5NPH) was synthesized and its application in the spectrophotometric determination of vanadium ion(IV) was studied in the presence of surfactant. The optimum conditions of pH, solvent effect, concentration of ligand and surfactant were evaluated. The procedure was applied to determination of vanadium (IV) in mixture sample and real sample with satisfactory results (recovery ${\geq}$ 97% ; relative standard deviation ${\leq}$ 3.0% in the concentration range of $0{\sim}1.5{\mu}g/mL$ ; detection limit, $0.02{\mu}g/mL$ in solution).
박찬일,김대식,Park, Chan-Il,Kim, Dae-Sik 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
The elevator gear box with the helical gears needs to be developed instead of the one with the worm gears to improve the efficiency. In order to develop the gear box, the analytical tool to predict the helical gear noise is necessary to meet customer's noise requirement. Gear noise is related to the loaded transmission error. Therefore, the simulation program fer the loaded transmission error analysis of the helical gears is developed in this study. Using the developed program, the effects of tooth modification such as tip relief and the extent of tip relief are investigated. Finally, the procedures to determine the tip relief and the extent of tip relief are proposed.
리드오차의 영향에 대한 헬리컬 기어 소음의 실험적 연구
박찬일,이장무,Park, Chan-Il,Lee, Jang-Mu 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.9
Nowadays reduction of gear noise in power transmission is very important, because the noise regulation is severe and demand of customer on noise is increased. To reduce gear noise, it is necessary to understand the noise characteristics of helical gear. In this work, we designed test rig for the study of gear noise and installed in semi-anechoic chamber. By using this rig, sound pressure level is measured under varying rotational speed and torque. The frequency characteristics of helical gear noise on the effect of lead errors and torque are discussed.
N-(2,4-dinitrophenyl)benzhydrazonyl Bromide 유도체의 가수분해 반응메카니즘
박찬일,차기원,이익춘,장병두,Park, Chan Il,Cha, Ki Won,Lee, Ik Choon,Chang, Byung Du 대한화학회 1997 대한화학회지 Vol.41 No.4
N-(2,4-dinitrophenyl)benzhydrazonyl bromide 유도체들의 가수분해 반응속도상수를 20$^{\circ}C$의 수용액에서 자외선 분광광도법으로 측정하여 넓은 pH 범위에서의 반응속도식을 구하였다. 반응속도식, 용매효과, 치환기 효과, 염효과, 열역학적 활성화 파라미터 등의 결과로부터 가수분해 반응메카니즘을 제안하였다. 즉, pH 3.0에서는 carbonium ion 중간체를 거쳐 SN1 반응에 의해 진행되며, pH 10.0에서는 1,3-dipolar 반응 메카니즘 또는 SN2 반응에 의해 진행됨을 제안하였다. The rate constants for the hydrolysis of N-(2,4-dinitrophenyl)benzhydrazonyl bromide and its derivatives were determined by ultraviolet visible spectrophotometry at 20$^{\circ}C$ and a rate equation which could be applied over a wide pH range was obtained. On the basis of rate equations derived and judging from the solvent effect, substituent effect, salt effect, thermodynamic parameter, plausible mechanisms of hydrolysis have been proposed. It may be concluded that the hydrolysis through SN1 mechanism via carbonium ion intermdiate to pH 3.0, and pH 10.0, the hydrolysis proceeds through 1,3-dipolar or SN2 mechanism.
축과 베어링 변형을 고려한 헬리컬 기어의 전달오차 해석
박찬일,조도현,Park, Chan-Il,Cho, Do-Hyun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10
Transmission error is highly related to gear noise. In order to predict the helical gear noise, transmission error analysis is needed. Up to now, the studies for the transmission error were conducted by the modeling of helical gears only. However, since helical gears are supported by the shaft and bearing, transmission error has the effects of the elements. In this study, the procedure to consider the shaft deformation with bearing stiffness for the transmission error analysis is proposed. To do so, the relationship between gear error and shaft deformation is analytically derived. Shaft deformation with bearing stiffness is analyzed by FEM. It is measured in the experimental test rig by the non-contact displacement sensors. Using the tooth error from tooth modification and the shaft deformation, the effects of shaft on the loaded transmission error are investigated.