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Kinetic Theory for Chemical Reactions in Liquids
신국조,Kook Joe Shin Korean Chemical Society 1981 대한화학회지 Vol.25 No.5
용액중에서 화학반응을 설명하기 위하여 한개의 대표적인 입자의 반복적 충돌현상까지 고려한 동역학적인 이론을 경구모델을 사용하여 연구하였다. 반응성을 지닌 대표적인 입자의 상공간 밀도의 시간상관함수가 만족시키는 동역학방정식을 유도하였고 이로부터 비활성 용매 S중에서 일어나는 A + B ${\rightleftharpoons$ C + D 형태의 가역반응에 관계되는 반응속도 계수의 인자를 투영연산자방법으로 구하였다. A test particle kinetic theory for reaction dynamics in liquids is presented at the repeated ring collision level for the hard sphere model. A kinetic equation for the equilibrium time correlation function of the reactive test particle phase space density is derived and the rate kernel expression for the reversible chemical reaction of the type A +B ${\rightleftharpoons$ C + D in the presence of inert solvent S is obtained by the projection operator method.
김명수,신국조,Myung Soo Kim,Kook Joe Shin Korean Chemical Society 1982 대한화학회지 Vol.26 No.4
순수 액체상태의 $CDCl_3$의 비등방성 회전운동을 라만 스펙트럼의 ${\nu}_1$- band를 분석하여 조사하였다. 이로부터 분자의 $C_3$-대칭축에 수직한 축 주위로의 회전운동에 관계되는 확산상수($D_{II}$)는 위에서 얻은 $D_{\perp}$와$^35C$l의 NQR이완시간으로 부터 구하였다. 이렇게 구한 확산상수들은 $^2H$와 $^35C$l의 NQR 이완시간으로 부터 구한 값들과 실험오차 범위내에서 잘 일치하였다. 또한 두 확산상수들의 값들로부터 순수한 CDC$l_3$의 재배치 운동이 상당히 비등방적인 것을 알게 되었다. Anisotropic rotation of $CDCl_3$ in neat liquid is investigated by the analysis of ${\nu}_1$ band of Raman spectrum and the diffusion constant($D_{\perp}$) for the tumbling motion is obtained. The diffusion constant ($D_{II}$) for the spinning motion is obtained from the above $D_{\perp}$ value and the chlorine-35 nuclear quadrupole relaxation time. The diffusion constants thus obtained seem to agree very well with the ones obtained from $^2H$ and $^35C$l in NQR results within experimental errors. The data suggest fairly anisotropic character of reorientational motions in neat $CDCl_3$.
Kim, Cheol-Ju,Lee, Dong Jae,Shin, Kook Joe 全北大學校 基礎科學硏究所 1991 基礎科學 Vol.14 No.2
The transition from one stable steady state branch to another stable steady state branch in a simple metabolic system with positive feedback is discussed with the aid of the bimodal Gaussian probability distribution method. Fluctuations lead to transitions from one stable steady state branch to the other, so that the bimodal Gaussian evolves to a new distribution. We also obtain the fractional occupancies in the two stable steady states in terms of a parameter characterizing conditions of the system.
A Nonlinear Theory of Diffusion - Driven Instability in the Oregonator
Lee, Myung Ho,Lee, Dong Jae,Shin, Kook Joe,Lee, Younghoon,Ko, Seuk Beum 全北大學校 基礎科學硏究所 1987 基礎科學 Vol.10 No.1
A nonlinear theory presented previously is applied to the Oregonator, which is a model for the Belousov-Zhatinskii reaction, to study instability near the critical point driven by diffusions. The result show that the theory may be applied to an actual system.
Multidimensional Frictional Coupling Effect in the Photoisomerization of trans-Stilbene
곽기정,이상엽,신국조,Gwak, Gi Jeong,Lee, Sang Yeop,Sin, Guk Jo Korean Chemical Society 1995 Bulletin of the Korean Chemical Society Vol.16 No.5
A model based on two coupled generalized Langevin equations is proposed to investigate the trans-stilbene photoisomerization dynamics. In this model, a system which has two independent coordinates is considered and these two system coordinates are coupled to the same harmonic bath. The direct coupling between the system coordinates is assumed negligible and these two coordinates influence each other through the frictional coupling mediated by solvent molecules. From the Hamiltonian which is equivalent to the coupled generalized Langevin equations, we obtain the transition state theory rate constants of the stilbene photoisomerization. The rates obtained from this model are compared to experimental results in n-alkane solvents.
Effects of Road Constructions on Soil Drainage from Paddy Fields
손연규,문용희,장용선,정강호,조혜래,현병근,신국식,한경화 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.3
Bad drainage problems from paddy fields adjacent to roads are caused by higher constructed roads which change topography of paddy fields to concave topography and artificial pan to prevent road erosion when road constructions are occurred. This study investigated effects of topography changes on soils by road constructions. Soil samples were investigated by physico-chemical analyses and micromorphology analyses from representative soil profile of Sachon series and soil samples. The characteristics of Sachon series that were adjacent to roads were fewer redoximorphic features (RMF) and increase in grey layers than the original Sachon series. The characteristics of Yecheon Series were shown from Jeollanamdo - Suncheon > Chungchungnamdo - Cheonan > Gangwondo - Wonju. Mosaic speckles were shown from micromorphological analyses because of repeat of shrink and expansion by wetting and drying. The location of graying in soil clods were found from coarse stone blocks to fine stone blocks and color changes of composed particles were also found.
김철주,이동재,고석범,신국조,Kim Cheol-Ju,Lee Dong Jae,Ko Seuk Beum,Shin Kook Joe Korean Chemical Society 1988 Bulletin of the Korean Chemical Society Vol.9 No.1
The time correlation functions of concentration fluctuations due to the random forces near the steady state are evaluated for a general two-component nonlinear chemical system by solving the corresponding two dimensional Fokker-Planck equation. The approximate method of solving the Fokker-Planck equation is based on the eigenfunction expansion and the corresponding eigenvalues for both the linear and nonlinear Fokker-Planck operators are obtained near the steady state. The general results are applied to the Lotka model near the oscillatory marginal steady state and the comparison is made between linear and nonlinear cases.
A Study on Soil Characteristics of Paddy Fields with Re-established Soils
손연규,문용희,장용선,정강호,조혜래,현병근,신국신,한경화 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.3
Six study sites in Gumi, Goryeong in Gyeongbuk province and Naju in Jeonnam province were selected to investigate soil properties of poorly drained horizons in paddy soils. The horizons were re-established layers which were parent material layers originated from fluvial deposits. Topsoil layers were differentiated from piled parent materials while soil structure of the topsoil layer was massive with striated microstructure. Compaction at soil re-establishment and a lack of structure and aggregate development in these soils may cause the limitation of vertical water movement and result in poorly drained horizons. Soil samples were taken from paddy fields with top soils of sandy loam, silt loam and silty clay loam and re-established soils of coarse and fine texture. The samples were taken from each horizon for the analyses of soil chemical and mineral properties. Soils with re-established soils of coarse texture had greater amounts of sands from top soil texture distributions, while soils with fine texture had greater amounts of silts. Chemical properties of top soils were analyzed from rice cultivated soils at the time of re-establishments and one year after the re-establishments. The coarse texture of the re-established horizons decreased in EC values from 0.23 to 0.11 (dS m -1 ), available phosphate values from 112 to 54 (mg kg -1 ), and exchangeable Ca values from 6.6 to 4.9 (cmolc kg -1 ). On the other hand, soils with fine texture showed decrease only in pH and exchangeable Ca values. Especially, organic matter and available phosphate contents showed heterogeneous distributions from each horizon. This result may be caused by mixture of plough layer and subsurface layer during and consolidation. Hydraulic conductivity values were low at the boundaries of top soil and parent material layers except SL/coarse soil. Soil microstructure was massive structure without soil clods or pores and showed striated structure. Therefore, re-established paddy fields with fluvial deposits as parent material layers showed limited vertical movements of soil water because of occurrence of compacted layers and less-development of soil clods and aggregates.
Virtual Target Tracking of Mobile Robot and Its Application to Formation Control
이영호,김신국,박종구,지상훈,문용선,조영조,국태용 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.2
A virtual target tracking approach is proposed for kinematic control of mobile robot. In the controller, linear and angular velocity inputs are generated by using the local data of robot position and orientation along with the estimated velocity of target object. Applying the proposed approach to a co-operative robot group with arbitrary number of multiple mobile robots, it is possible to create various robot formations for cooperative navigation and tracking of moving object. The developed controller is shown to be stable and convergent through theoretical proof and a series of experiments.