• Proceedings of the Korea Technology Innovation Society Conference
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• 1999.05a
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• pp.395-408
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• 1999

From the dependence the primary energy of about 97% on imported energy from abroad in Korea, 1997, and the pressure by international address to the Global Climate Change and environmental problem, we should do our best efforts to develop and diffuse of energy technologies. Also, the developed countries such USA, EU, Japan, and so on, are promoting and accelerating the development of energy technologies. From those point of views, we thought that Korea now in the time to provide the new and updated strategies to develop the energy technologies more actively for enhancing national capability, The Korea Institute of Energy Research(KIER), the complex research institution for energies except nuclear energy sponsored by government, prepared the mid and long term strategies and primary research projects, must be worked in and with the KIER, for the areas related to the energy conservation and efficiency increase, the energy environment, the alternative energy, and the diffusion of developed energy technologies.

• The Bulletin of The Korean Astronomical Society
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• v.39 no.2
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• pp.79.1-79.1
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• 2014

We present the result of near-infrared (near-IR) imaging polarimetry of star-forming regions in the Large Magellanic Cloud (LMC). We compiled near-IR photometric and polarimetric data of N159/160 regions. The photometric and polarimetric data were simultaneously obtained in J, H, and Ks bands using SIRPOL, an imaging polarimeter of the InfraRed Survey Facility (IRSF), in 2007 February. We measured Stokes parameters of point-like sources to derive their degree of polarization and polarization position angles. In this poster, we present polarization properties of these star-forming regions. We also discuss the polarization structure in these regions compared with mid-infrared dust emission structure from the Spitzer SAGE survey.

• Korean Journal of Child Studies
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• v.13 no.2
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• pp.129-144
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• 1992

The purpose of this study was to investigate the current status of family child care. The status of family child care was explored in terms of general characteristics, program quality, and child behavior. The subjects were 17 family child care and their 102 children and 60 parents. Harms & Clifford's (1989) FDCRS(Family Day Care Rating Scale) was used to measure program quality. Child behavior was recorded by time sampling in two 30 min observations during the free play session in each facility. A questionnaire for caregiver and parents was used to investigate general characteristics. The data were analysed by frequency, percentage, and Pearson's r. Results showed that (1) a wide range of variable accounted for the general characteristics of family child care, (2) the level of program quality as rated by the FDCRS was below mid-point, (3) children engaged in solitary behavior much more than in peer interactions or caregiver-child interactions.

• Journal of applied mathematics & informatics
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• v.36 no.3_4
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• pp.181-203
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• 2018

In this paper, we have constructed an overlapping Schwarz method for singularly perturbed second order convection-diffusion equations. The method splits the original domain into two overlapping subdomains. A hybrid difference scheme is proposed in which on the boundary layer region we use the central finite difference scheme on a uniform mesh while on the non-layer region we use the mid-point difference scheme on a uniform mesh. It is shown that the numerical approximations which converge in the maximum norm to the exact solution. When appropriate subdomains are used, the numerical approximations generated from the method are shown to be first order convergent. Furthermore it is shown that, two iterations are sufficient to achieve the expected accuracy. Numerical examples are presented to support the theoretical results. The main advantages of this method used with the proposed scheme is it reduces iteration counts very much and easily identifies in which iteration the Schwarz iterate terminates.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.327-331
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• 1997

As demand for various kinds and small lot products has been increasing, batch annealing has been appreciated for its small restiction for the opteration. The cold spot of the coil is very important in the BAF(Batch annealing furnace) annealing process. Because of the annealing cycle time in the BAF, annealing was decided on the cold spot of the coil. So, we tested the effect,variation of cold spot, for hydrogen contents of atmospheric gas at the annealing furnace. As a result of several investigations. We confirmed the following characteristics ; after the heating and soaking,the cold spot of coil moved to 1/3 of coil thickness in the NHx atmospheric gas, but the mid point of the coil thickness is the cold spot in the Ax or .H/sub2. atmospheric gas. Therefore, the use of hydrogen instead of nitrogen as the protective gas,combined with high convection in batch annealing furnaces, has shown that considerable increases in furnace output and material quality are attainable. Owing to the low density, high diffusion and reducing character of hydrogen, a better transfer resulting in uniform material temperatures and improved coil surfaces can be achieved.

• Economic and Environmental Geology
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• v.32 no.5
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• pp.495-502
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• 1999

Common-mid-point (CMP) seismic data on a dipping layer have have a stacking different from a horizontal layer velocity and the reflection points on data are dispersed to many positions. Therefore, the CMP data are not stacked well by the conventional stacking method using the horizontal layer velocity. The CMP gather can ideally stacked by applying dip-moveout(DMO) processing. Hence, modern seismic processing indludes DMO as an essential routine step. DMO processing techniques are broadly categorized by two, Fourier transform and integral methods, each of which has many different computational schemes. In this study, the dip-decomposition technique of the Fourier transform method is used to test the DMO effect on the synthetic scismic data generated for dipping structures. Each of constnat offset sections NMO corrected by using the layer velocity of the model and DMO processed. The resulting zero-offset sections for many offsets are stacked. The stacked sections with DMO processing show the structural boundaries of the models much better than those without DMO processing.

• Journal of Korean Society of Steel Construction
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• v.8 no.3 s.28
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• pp.107-116
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• 1996

The studies are conducted to investigate the fatigue and fracture, behavior of preflex girder. In this work, the fatigue tests using by constant amplitude fatigue loading and 4-point-loading to maintain pure bending condition in the mid-span of preflex girder will be performed. It is expected from the results of the studies to provide the fatigue strength and the S-N curve of preflex girders. In addition, it will be ensured that fracture initiation occurs in the welded part of horseshoe-type shear connector as well as in other welded joints.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.12
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• pp.220-228
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• 1995

An optimized 4-stage 12-bit pipelined CMOS analog-to-digital converter (ADC) architecture is proposed to obtain high linearity and high yield. The ADC based on a multiplying digital-to-analog converter (MDAC) selectively employs a binary-weighted-capacitor (BWC) array in the front-end stage and a unit-capacitor (UC) array in the back-end stages to improve integral nonlinearity (INL) and differential nonlinearity (DNL) simultaneously whil maintaining high yield. A digital-domain nonlinear error calibration technique is applied in the first stage of the ADC to improve its accuracy to 12-bit level. The largest DNL error in the mid-point code of the ADC is reduced by avoiding a code-error symmetry observed in a conventional digitally calibrated ADC is reduced by avoiding a code-error symmetry observed in a conventional digitally calibrated ADC is simulated to prove the effectiveness of the proposed ADC architecture.

• Journal of Families and Better Life
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• v.9 no.2
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• pp.323-343
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• 1991

The purpose of this study is to examine the relationship among stressor(role conflict), coping strategy, and psychological well-being toward dual-career wives. For this purpose data were collected form 117 dual -career wives. The statistical methods used for data analysis were frequency distribution. percentile, Pearson's correlation and multiple regression. The results were as follows; 1)The general tendency of the stressor level of dual-career wives was slightly over the mid-point scores, 2.5 and the level of psychological well-being was relatively high. Also, the degree to which dual-career wives used coping strategies was relatively high. 2)Role conflicts were negatively related to psychological well-being. 3)Coping strategies were positively related to psychological well-being. 4)The degree of the negative influence which role conflicts had on psychological well-being was lower int he group using a high degree of coping strategies than in the group using a low degree of coping strategies.

• Journal of applied mathematics & informatics
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• v.27 no.5_6
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• pp.1001-1015
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• 2009

In this paper, two hybrid difference schemes on the Shishkin mesh are constructed for solving a weakly coupled system of two singularly perturbed convection-diffusion second order ordinary differential equations with a small parameter multiplying the highest derivative. We prove that the schemes are almost second order convergence in the supremum norm independent of the diffusion parameter. Error bounds for the numerical solution and its derivative are established. Numerical results are provided to illustrate the theoretical results.