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오채근,김종인,이병학,윤재항,김창현,김성재 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.1
Objectives : The aim of this study was to compare endogenous plasma lithium concentrations among schizophrenic patients classified by DSM-IV subtype and control groups and to investigate the correlation of endogenous plasma lithium concentration and psychotic symptoms in schizophrenia. Methods : Schizophrenic patients were selected among psychiatric inpatients without lithium medication and then classified by DSM-IV schizophrenia subtype, Schizophrenic patient groups were composed of 15 disorganized type, 15 paranoid type and 15 undilferentiated type schizophrenic patients. The control group was composed of 15 healthy subjects without any psychiatric disease,Endogenous plasma lithium concentrations were estimated by inductively coupled plasma atomic emission spectrometer. The psychotic symptoms in schizophrenic patients were classified as positive symptoms, negative symptoms and disorganized symptoms according to andreasen classificationl about SANS and SAPS items. Endogenous plasma lithium Con-centration among three subtypes of schizophrenia and control group was compared, and correlation between endogenous plasma lithium concentrations and psychotic symptoms was examined. Rcsults : 1) Schizoprenic patients showed higher endogenous plasma lithium concentration than control groups (p=0.033). Endogenous plasma lithium concentrations were significantly different among three subtypes of schizophrenia (p=0.001). Compared with the control group, disorganized type showed higher endogenous plasma lithium concentration, but paranoid type and undifferentiated type were not significantly different. 2) Disorganized symptoms correlated with endogenous plasma lithium concentration (r=0.416, P=0.004), but negative symptom and positive symptom did not significantly correlate with endogenous plasma lithium concentration (r=0.202, P=0.184. r= -0.216, P=0.155). Conclusion : These results suggested that schizophrenic patients with disorganized symptom show the differences in utilization or distribution of endogenous lithium.
공압 피로 시험기 구성을 위한 공압실린더의 고속/고정밀 제어기술
채근병(Geun Byeong Chae),심범식(Bumsik Sim),김영신(Yeongshin Kim),김후식(Hushik Kim),김봉호(Bongho Kim),이원균(Wonkyun Lee) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.3
A hydraulic cylinder is typically used in fatigue testing machines for generating reciprocal motion. Hydraulic cylinders adversely affect the environment because they consume high amounts of oil for maintenance. Pneumatic cylinders can serve as potential alternatives to overcome this drawback. However, it is difficult to control a pneumatic cylinder with high accuracy due to the compressibility of air. This study presents a new control method for high-speed and high-precision control of a pneumatic cylinder for a servo-pneumatic fatigue testing machine. Displacement and load controllers with proportional-proportional-integral feedback and feedforward algorithms are proposed. Furthermore, an auto-tuning algorithm of a feedforward controller gain is proposed to improve control performance. A servo-pneumatic fatigue testing machine is constructed, and the control performance is evaluated via displacement and load control experiments at the various conditions.
채근화(K.H. Chae),송종환(J.H. Song),정성문(S.M. Jung),장홍규(H.G. Jang),주장현(J.H. Joo),강석태(S.T. Kang),최범식(B.S. Choi),김상옥(S.O. Kim),황정남(C.N. Whang) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.1
이온선혼합의 열충격으로 야기되는 등방적 또는 이방적 원자이동을 정량적으로 묘사하기 위한 모형을 제시하였다. 불순물 확산에서 원자들의 이동비는 구성원자들의 활성화에너지에 의존한다. 이 모형은 0에 가까운 혼합열과 비교적 높은 활성화에너지를 가진 이중층들의 실험결과들을 만족스럽게 예견한다. 불순물 확산에서 구성원자들의 활성화에너지가 크게 차이가 나는 계들은 이방적 원자이동을 보여주는 반면, 비슷한 활성화에너지를 가지는 계들은 등방적 원자이동을 나타낸다. A simple model is presented to describe quantitative the isotropic and anisotropic atomic transport in thermal spike induced ion mixing. The ratio of atomic transport depends on the activation energies of constituents for the impurity diffusion. The model predicts fairly satisfactory the trend of experimental observations for the bilayer systems which have near zero heats of mixing and relatively high spike activation energies. The systems which have large difference in activation energies of constituents for the impurity diffusion show the anisotropic atomic transport, while the systems having similar activation energies for the impurity diffusion reveal the isotropic atomic transport.
Synthsis of metal nanoparticles using the electron beam irradiation
채근석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Metal nanoparticles have been intensively studied over last decade due to their various novel properties such as electronic, magnetic and catalytic properties. Recently, the electron irradiation technique has been developed for the synthesis of special nanostructures and nanomaterials. Metal nanoparticles could be prepared by reduction of metal ions by electron beam irradiation without any added chemical reductant. Reduction of metal ions occurs here by the species that are generated in the radiolysis of the aqueous solvents. This talk will be introduce a simple one-step method for synthesizing metal nanoparticles at room temperature by irradiation of a metal precursor aqueous solution using an electron beam.