• Proceedings of the IEEK Conference
• /
• 1999.06a
• /
• pp.749-752
• /
• 1999

A new interface circuit for variable resistive sensors is proposed. The interface circuit compose of only two strain gages, a voltage-to-current converter, and current mirror with two outputs. A new dual slope A/D converter based on linear operational transconductance amplifier for the testing of prototype interface circuit is also described. The theory of operation is presented and experimental results are used to verify the theoretical predictions. The results show close agreement between predicted behaviour and experimental performance.

• Proceedings of the IEEK Conference
• /
• 1999.06a
• /
• pp.357-360
• /
• 1999

A 20 MHz CMOS continuous low-pass filter using simulated floating inductor consisted of two fully-differential transconductors and a capacitor is presented. The theory of operation is described and simulation results show close agreement between predicted behaviour and experimential performance. Simulation results show that the filter has ripple bandwidth of 22 MHz, pass-band ripple of 0.36 ㏈. and cutoff frequency of 26 MHz at supplay voltage of $\pm$3 V. The power dissipation is 19.2 ㎽.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 1995.03a
• /
• pp.24-33
• /
• 1995

The feasibility of generating controlled surface topographies in single-point conventional turning operations is investigated. First a mathematical model of the surface generation process was developed. Second in order to control the texture of the machined surface a micro-positioning stage and the associated command generation software were designed and built. Experimental examples have shown that surface texture can be precisely controlled and is in good agreement with the theoretical predictions.

• Journal of the Korea Society for Simulation
• /
• v.7 no.2
• /
• pp.17-32
• /
• 1998

The flow fields in Gas Bubble Driven Circulation Systems were numerically analyzed. In various gas flow rate and bubble size, the flow characteristics were predicted. Eulerian-Eulerian approach was used for the formulation of both the continuous and dispersed phases. The modification of the general purpose computer program PHOENICS code was employed to predict the mean flow fields, turbulent characteristics, gas dispersion, volume fraction. The predicted shows very satisfactory agreement with experimental results for all regions of ladle. The results are of interest in the design and operation of wide variety of material processing.

• Journal of Chest Surgery
• /
• v.16 no.3
• /
• pp.399-404
• /
• 1983

In general, hiatal hernia is rare incidence among diaphragmatic hernia in Korea especially in pediatric group. Recently great interest in hiatal hernia has not led to common agreement concerning the pathophysiology, method of diagnosis, clinical picture, Indications, and type of treatment. At 1981 and 1983, two cases of congenital hiatal hernia [type I, III] were surgically treated,which surgical Intervention was modified Hill`s operation and gastropexy. Postoperatively, clinical and radiological examination were proved no regurgitation, no dysphagia and well passage of barium.

• Journal of the Korean Society for Precision Engineering
• /
• v.5 no.1
• /
• pp.29-39
• /
• 1988

Plastically deformed layer beneath metal surface machined by orthogonal cutting was evaluated in terms of residual stress, microvickers hardness, side spread, and the side strain. An attempt was made to predict the depth of layer according to machining conditions particularly tool geometry and the shear plane angle. In this paper, we employed two models concerning the sliplines. The exact model was validated by comparision of computed and measured tool force and its angle, and the model offers an upper boundary of the deformed layer to be in good agreement with the experiment.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.26 no.2
• /
• pp.61-70
• /
• 2012

Recently due to the increasing of the importance on the green energy is getting higher by implementing EERS(Energy Efficiency Resource Standards) and NA(Negotiated Agreement) such as lacks of natural resources and The United Nations Framework Convention on Climate Change. And the most practical solution is CHP(Combined Heat and Power) which performs the best energy efficiency. This paper developed optimal operation mechanism of CES(Community Energy System) for enhancement of energy efficiency using CHP(Combined Heat and Power), PLB(Peak Load Boiler) and ACC(ACCumulator) capacities. This method optimally operated these capacities calculated the maximum profits by Dynamic Programing. Through the case studies, it is verified that the proposed algorithm of can evaluate availability.

• 한국신재생에너지학회:학술대회논문집
• /
• 2010.11a
• /
• pp.198.2-198.2
• /
• 2010

Three dimensional numerical analysis of the oxygen and air were performed to investigate the combustion characteristics in a Corner-type pulverized coal boiler. With the actual operation data of the power plant, the distribution of velocity, gas temperature, $O^2$, $CO_2$, $H_2O$, $N_2$ as well as the particle tracking in the boiler were investigated. The predicted values at the outlet of furnace for the gas temperature and major species concentrations gave a good agreement with the designed values. The present analysis on combustion characteristics in a boiler would provide the useful information for the stable boiler operation and in trouble shooting boiler problem.

• 한국연소학회:학술대회논문집
• /
• 2014.11a
• /
• pp.37-40
• /
• 2014

Capturing the carbon dioxide emitted from coal-fired power plants will be necessary if targeted reduction in carbon emissions is to be achieved. Modelling and simulation are the base for optimal operation and control in thermal power plant and also play an important role in energy savings. This study aims to analyze the performance of supercritical coal fired power plant through steady and dynamic simulation using a commercial software gCCS. A whole power plant has been modeled and validated with design data of 500 MWe power plant, base and part load operations of the plant were also evaluated, consequently it had been proven that the simulated result had a good agreement with actual operating data. In addition, the effect of co-firng on the plant efficiency and flue gases were investigated using gCCS simulator.

• Korean Journal of English Language and Linguistics
• /
• v.1 no.1
• /
• pp.145-162
• /
• 2001

The operation Move is defined in Chomsky (1999, 2000) as a composite operation consisting of three components: Agree, Identify and Merge, taking Agree as a necessary condition for Move. Therefore, I call this definition of Move as the Agree-based Move. In this paper, I argue that the Agree-based approach to Move cannot be maintained; I claim that the Selection-based approach to Move, in which the EPP-feature is analyzed as an s-selectional property of a head, offers a more natural account of the sentences under consideration. I believe that the three components of Move as defined in (6) happen to co-occur in the derivation of certain sentences, as the composite transformation called Passivization does in the derivation of a passive sentence like “the city was destroyed by the enemy.” On the basis of these observations, I conclude that Agree and Move should be regarded as separate computational operations; the task of Agree is to erase uninterpretable features of both probe and goal, and that of Move is to satisfy the EPP-feature, which should be taken as an s-selectional feature.