• Transactions of Materials Processing
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• v.19 no.8
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• pp.474-479
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• 2010

Newly suggested hybrid LED package can reduce the number of LED processes and enhance light efficacy in virtue of its integrated optical patterns. Square-type pyramid pattern was chosen for the integrated optical pattern in this study, and it was proved that the pattern enhances illuminance about three times and luminance about two and half times by optical simulation. Square-type pyramid patterns of 0.02mm height and 0.04mm pitch were successively machined on a copper mold which is necessary for imprinting the integrated pattern. Hybrid LED package with integrated optical pattern will be manufactured with ultra-fine machined mold in future study.

• Journal for History of Mathematics
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• v.23 no.2
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• pp.89-99
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• 2010

Today linear algebra is one of compulsory courses for university mathematics by virtue of its theoretical fundamentals and fruitful applications. Vector theory and matrix theory constitute of main topics in linear algebra. In the present paper we consider the question which of the two topics is prior in teaching of linear algebra. We suggest that vector theory should be prior to matrix theory contrary to the historical order of them.

• Bulletin of the Korean Mathematical Society
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• v.52 no.2
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• pp.483-504
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• 2015

This paper is devoted to solving a multidimensional backward stochastic differential equation with a general time interval, where the generator is uniformly continuous in (y, z) non-uniformly with respect to t. By establishing some results on deterministic backward differential equations with general time intervals, and by virtue of Girsanov's theorem and convolution technique, we prove a new existence and uniqueness result for solutions of this kind of backward stochastic differential equations, which extends the results of [8] and [6] to the general time interval case.

• Journal of the Korean Mathematical Society
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• v.49 no.6
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• pp.1301-1321
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• 2012

In this paper we study the unique solvability of backward stochastic Volterra integral equations (BSVIEs in short), in terms of both the adapted M-solutions introduced in [19] and the adapted solutions via a new method. A general existence and uniqueness of adapted M-solutions is proved under non-Lipschitz conditions by virtue of a briefer argument than the ones in [13] and [19], which modifies and extends the results in [13] and [19] respectively. For the adapted solutions, the unique solvability of BSVIEs under more general stochastic non-Lipschitz conditions is shown, which improves and generalizes the results in [7], [14] and [15].

• Journal of Korean Medical classics
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• v.21 no.3
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• pp.91-102
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• 2008

The most important part of understanding properties of Sasang-in(四象人) is analysis of human characters. In spite of that aspect, there are not enough explanations of human characters like natural virtues, for example Inseong(仁性), in Ijema(李濟馬)'s writings. In this examination we mainly investigated particular relationship between So-eumin(少陰人) and Inseong(仁性). But revelation and practice of Inseong(仁性) are not only belonged to So-eumin(少陰人), also applied to all people of Sasang-in(四象人). Specially for the purpose of recognizing human characters, Ijema(李濟馬) assigned virtues that is to say Inuiyeji(仁義禮智), to each persons of Sasang-in(四象人). We have explained which properties of such Sasang-in(四象人), not limited to So-eumin(少陰人), is concerned with natural virtue In(仁), actually that explanations are more concentrated to relation between Taeyang-in(太陽人) and Inseong(仁性).

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.813-816
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• 2003

The dielectric breakdown of epoxy composites used for transformers was experimented and then its data were applied to Weibull distribution probability. First of all, speaking of dielectric breakdown properties, the more hardener increased, the stronger breakdown strength became at low temperature because of cross-linked density by the virtue of ester radical. The breakdown strength of specimens with filler was lower than it of non-filler specimens because it is believed that the adding filler forms interface and charge is accumulated in it, therefore the molecular motility is raised and the electric field is concentrated. In the case of filled specimens with treating silane, the breakdown strength become much higher. Finally, according to Weibull distribution analysis, reducing breakdown probability of equipment insulation lower than 0.1 % level requires the allowable field intensity values to be kept under 21.5 MV/cm.

• Journal of the Korean housing association
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• v.16 no.2
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• pp.11-17
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• 2005

The purpose of this study is to find the characteristics of planning factors to the outdoor space of the olympic village munchen. The result of the research are follows; 1) The horizontal gardens of the low buildings and hanging gardens on the terraces of the high-rise buildings are intended as a continuation of the concept of the modelled landscape. 2) By virtue of the choice of the type of building and the way in which the buildings are staggered, the residents have an unimpaired view of the green spaces and recreation areas. 3) Leisure value is further enhanced by the proximity of the residential arms to the footpath running north to south. 4) The terraces allow the residents to enjoy more sun and sky, so that the view into the distance is the rule. 5) To improve orientation, the pedestrian paths to the residential wings are also situated directly over the underground vehicle-access roads.

• Transactions on Electrical and Electronic Materials
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• v.14 no.6
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• pp.291-294
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• 2013

When subjected to a change in dimensions, the device performance decreases. Multi-gate SOI devices, viz. the Double Gate MOSFET (DG-MOSFET), are expected to make inroads into integrated circuit applications previously dominated exclusively by planar MOSFETs. The primary focus of attention is how channel engineering (i.e. Graded Channel (GC)) and gate engineering (i.e. Dual Insulator (DI)) as gate oxide) creates an effect on the device performance, specifically, leakage current ($I_{off}$), on current ($I_{on}$), and DIBL. This study examines the performance of the devices, by virtue of a simulation analysis, in conjunction with N-channel DG-MOSFETs. The important parameters for improvement in circuit speed and power consumption are discussed. From the analysis, DG-DI MOSFET is the most suitable candidate for high speed switching application, simultaneously providing better performance as an amplifier.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1209_1210
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• 2009

Recently interior of a country have been innovated driverless LRT(lightweight railway train) that has a virtue of reducion of payroll cost, decrease of headway and improvement of speed. But, if driverless LRT will be happened a accident, response capacity considerably have low. And then passenger will have feel fear. This thesis had examination a IEC 62267 : AUGT safety requirement and analyze safe facilities of the inside and outside of the country. Later on, this result will have not only increase economics, reliability, convenience and safety but also set standardization standard.

• Journal of Electrical Engineering and Technology
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• v.10 no.4
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• pp.1682-1691
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• 2015

In this paper, a real time implementation of selective harmonic elimination pulse width modulation (SHEPWM) using Real Coded Genetic Algorithm (RGA), Particle Swarm Optimization technique (PSO) and a new technique known as Linearization Method (LM) for Single Phase Matrix Converter (SPMC) is designed and discussed. In the proposed technique, the switching frequency is fixed and the optimum switching angles are obtained using simple mathematical calculations. A MATLAB simulation was carried out, and FFT analysis of the simulated output voltage waveform confirms the effectiveness of the proposed method. An experimental setup was also developed, and the switching angles and firing pulses are generated using Field Programmable Gate Array (FPGA) processor. The proposed method proves that it is much applicable in the industrial applications by virtue of its suitability in real time applications.