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강웅기,김영욱,Woong Ki Kang,Yong Wook Kim 대한화학회 1963 대한화학회지 Vol.7 No.1
The effect of the pulsation on the particle hold-up in a pulsed wetted column has been studied theoretically for the case of laminar region and experimentally for the cases of transient and turbulent regions. The experiment has been carried out by employing water as fluid medium and solid particles. The pulsation has been given by the reciprocating motion of a piston. The results of the investigation show that the pulsation would not give apparent effect on the particle hold-up but would increase the total travelling length of the particle.
강웅기,김영욱,Woong Ki Kang,Yung Wook Kim 대한화학회 1963 대한화학회지 Vol.7 No.3
The eddy diffusion in the pulsed wetted wall column, where the spherical balls are consecutively arrayed along the axis of the column and turbulence is caused around the balls by pulsation, has been studied both theoretically and experimentally. A diffusion equation is solved for a longitudinal column where a concentration impulse is given at the top of the column, and the experimental results, which are the impulse response measurements at the half of the total height of the column, have shown a good agreement with the developed theory. A method of measuring the eddy diffusivity, which is based on the slope of concentration vs. time in the particular interval of concentration, is proposed and the measured diffusivity is used as a criterion of comparing the theory and the experiment. The eddy diffusion is remarkably increased as the amplitude and the frequency of the pulsation increase but the increasing rate is decreased as the pulsation increases.
강웅기,Kang, Woong-Ki 대한화학회 1962 대한화학회지 Vol.6 No.2
A new method of evaluating the mixing time in the continuous flow stirred tank is herein proposed. Experimental results to test the concept are also presented.The mixing time is defined as the time interval between the injection of a slug of an electrolyte solution into the tank and the moment at which an essentially straight line begins on a plot of the conductivity of effluent versus time.The proposed method of measuring the mixing time is valid even for the low mixing time (5 seconds) and the results obtained agree well with previous work, where the mixing time measurements were carried out by the injection of a dye into the feed stream.
박수민(Soo Min Park),강웅기(Woong Ki Kang),진태석(Tae-Seok Jin),이장명(Jang-Myung Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
In this study, as the preliminary step for developing a multi-purpose mobile robot to navigate and avoide an obstacle in an unknown environment, we designed and implemented a Service Robot (IRL-2002) for an information center and a delivery service vehicle in an indoor and outdoor environmet. It is preferable to research the intelligent mobile robot providing necessary information and servicing for guests or operators all day long. Since it has several sensors to detect obstacles and guests who need the help, it can also keep the corridor from the robber during the night. In implementing IRL-2002 robot driving, we have used multi-sensor systems with vision, ultra sonar ring and compass sensors; adopted the high-speed wireless LAN for bi-directional communication between the main processor in mobile robot and a host server. we with give an explanation for the robot system architecture designed and implemented in this study and a short review of existing techniques, since there exist several recent thorough books and review paper on this paper. It is proposed the rusult from the simulation run based on a virtual force field(VFF) method to support the validity of the aforementioned architecture of mobile service robot for local navigation and obstacle avoidance for autonomous mobile robots. We will conclude by discussing some possible future extensions of the project.
강웅기,장윤호 한국화학공학회 1979 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.17 No.6
石炭의 燃燒反應은 反應경계면이 移動하는 非觸媒 不均一 反應으로 本 硏究에서는 가정용 燃料인 구공탄은 解析키 위한 基礎硏究로서 環狀시린더型의 幾何學的 構造를 갖고 있는 1구멍炭 固體試料를 使用하여 國産無煙炭의 燃燒機構를 解析하였다. 數式모델은 反應경계면에서 平衡反應과 1次反應의 두가지 假定을 使用하여 Unreacted-Core Shrinking Model을 基礎로 한 物質收支 및 熱收支式을 세웠다. 實驗結果를 理論값과 比較하므로서 700℃ 이상의 溫度에서는 平衡反應 假定이 타당하며, 600℃ 이하의 溫度에서는 反應表面에서 1次反應으로 보는 것이 타당함을 알 수 있었다. In this study, the combustion mechanism of Korean anthracite coal has been studied. The combustion is a typical noncatalytic heterogeneous reaction of the unreacted-core shrinking nature. The geometry of the reacting substance employed was an annulus cylinder which could simulate, $quot;Gugong-tan$quot;, multi-hole coal briquette, used for a residential fuel in Korea. The theoretical solutions for the mass and heat balance equations derived from the unreacted-core shrinking model were obtained under two different assumptions, the reaction equilibrium and the first order reaction at the reacting surface. The experimentaI resLllts, obtained with pelletized 30∼60 mesh anthracite were compared with the theoretical solutions. For the temperature higher than 700℃, the results agreed well with the equilibrium assumption, while the results were better fitted to the first order reaction for the temperature lower than 600℃.