• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.211-212
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• 2006

This paper represents a Doherty amplifier with analog predistorter to improve the linearity of the Doherty amplifier while preserving the high efficiency. A $3^{rd}$-order predistorter cancels $5^{th}$-order intermodulation (IM5) as well as $3^{rd}$-order intermodulation (IM3) components by their same phase difference in the predistorter and Doherty amplifier. This is accomplished by independently controlling their phase by using the phase-controlled error generator in the predistorter. For experimental verification, a $3^{rd}$-order predistorter has been implemented and tested in a 180-W Doherty amplifier at the wide-band code division multiple access (WCDMA) band. The measured results show good performance with the predistortion Doherty amplifier.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.3
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• pp.292-297
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• 2011

MPF(Magnetic pulse forming) process refers to the high velocity and high strain rate deformation of a low-ductility materials driven by electromagnetic forces that are generated by the rapid discharge current through forming coil. The goal of this study was to find the characteristics of dynamic behavior of workpiece and to find the main design process on MPF using bar forming coil. For these purposes, thin Al5053 sheet were used for the experiment. The measured strain data were analyzed by developed electromagnetic FE-model. The main design parameter is location of coil, electromagnetic force. In case of the bar forming coil, there exists the dead regions where the low electromagnetic force applied on the workpiece.

• Journal of the Korean GEO-environmental Society
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• v.21 no.8
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• pp.15-27
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• 2020

In the current paper, a series of advanced 3D finite element analyses have been performed on existing pieces of work of negative skin friction from a geotechnical centrifuge test and full-scale field measurements. From these analyses, key features of pile behaviour under the influence of negative skin friction which, previously, were not fully understood in existing studies, have been meticulously discussed. As such, it has been possible to successfully address several numerical modelling issues such as negative skin friction induced pile settlements and group effects (the shielding effect), the effect of sacrificial piles in groups and the interaction between the pile head and the cap, the effect of interface elements at the pile-soil interface and the time-dependent pile behaviour. During a geotechnical centrifuge test, substantial amounts of negative skin frictions were mobilised when centrifugal acceleration increased from 1g to a certain g-level due to an increase in the self-weight of soil. The behaviour of piles inside a group were heavily affected by the sacrificial piles and the connectivity between the pile head and the pile cap. In particular, as negative skin friction has time dependent qualities associated with consolidation, it was logical to perform coupled analyses when analysing piles in consolidating grounds. From the current work, several insufficiencies of previous researches have been addressed, and the engineering pile behaviour subjected to negative skin friction has been clarified.

• The Journal of Korean Philosophical History
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• no.50
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• pp.9-36
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• 2016

This thesis aims to suggest probability of modern confrontation of Yulgok YiYi's thought. For this, find out the meaning of Li-Qi-Zhi-Miao(理氣之妙) and through the Qi-Fa-Li-Cheng-Yi-Tu(氣發理乘一途), and Li-Tong-Qi-Ju-Shou(理通 氣局說), Yin-Xim-Do-Xim-Shou(人心道心說), he creatively reveal the relation of Xin(心) Xing(性) Qing(情) Yi(意) continually. On one side he suggested the way of ideal man, on the other side he was showed adaptablity to the real world. So I think Yulgok had placed emphasis on the Zhongyong(中庸) and Yijing(周易), so he point out the meaning of ShiZhong (時中). Then he had high ideals practical Zhi-Zhonghe((致中和). So This paper is to find out his foundation of epistemology, and then to know It's modern meaning of methodology of moral Education's Implication on the relation of Xin(心) Xing(性) Qing(情) Yi(意). So We ca find out Ji(機) is very important the transition of Qi-Zhe(氣質).

• Journal of Korean Medical classics
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• v.13 no.1
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• pp.117-145
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• 2000

Tongmu I Je-ma(1837-1900) set up Sasang Constitutional Medicine(四象體質醫學), a medical theory that would be original in the Korean medical history through his book ${\ll}$Tang-uisusebowon(東醫壽世保元)${\gg}$. In this book, he writes that he found the clue to his sasang Constitution(四象體質) theory from ${\ll}$Hwangjenaegyong(黃帝內經)${\gg}$. But the main logic that gives shape to the Constitution(體質) theory is $s{\check{o}}ng-ch{\check{o}}ng$ theory(性情論) of Confucian. Therefore, Tongmu(東武)'s Constitution $s{\check{o}}ng-ch{\check{o}}ng$ theory(體質性情論) is fundamentally based on confucian thoughts. Kongmaeng(孔孟) saw $s{\check{o}}ng$(性) as a base for connecting the entire mankind to be united, and $ch{\check{o}}ng$(情) as a individual thing that can exalted differently according to one's state of mind. Chuja(朱子) weakene the human's active volition by dividing $s{\check{o}}ng$ and $ch{\check{o}}ng$ as ibal(理發) and kibal(氣發) and therefore describing mankind to be submitted to Heaven's will. On the other hand Yolgok(栗谷) generalized $s{\check{o}}ng-ch{\check{o}}ng$ in the active mind of man himself by saying that $s{\check{o}}ng$ is when i-ki(理氣) does not act as a bodily function of the mind and $ch{\check{o}}ng$ is when it does. Furthennore he emphasized man's activeness on pursuing good by saying that the division of good and bad does not start from the origin of motion but is divided by the condition of ki(氣) which leads motion. Tongmu, who was influenced by Yulgok linked both $s{\check{o}}ng$and $ch{\check{o}}ng$ through, happiness, anger, sadness, pleasure(喜怒哀樂), and saw $s{\check{o}}ng$ as the ability to recognize good which is in the kijil(氣質) formed from the integration of i-ki, and saw $ch{\check{o}}ng$ as $s{\check{o}}ng$ blurred by man's greed. In addition to this, he says that the direct connection between each person's divergence in $s{\check{o}}ng-ch{\check{o}}ng$ and the condition of Four-organ(四臟) which is ki, not the mind which is i(理) forms sasangch'ejirin(四象體質人). His theory that illness comes from the partiality of $s{\check{o}}ng-ch{\check{o}}ng$ and therefore can prevent this by clarifying the mind and adjusting $s{\check{o}}ng-ch{\check{o}}ng$ through volition, has led Korean oriental medicine to be human based.

• Journal of Korean Medical Ki-Gong Academy
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• v.9 no.1
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• pp.217-237
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• 2006

The purpose of this paper is to show that there is a sure effect of the Extra Gigong Therapy(EGT) on Osteoarthritis patients. 1. Methods of the Spreading-Qi, Breathe naturally, concentrate the mind on Lower Dan(elixir field), When exhaling, Mindwill accompanies Qi to go to the Conception Vessel(CV) and Governor Vessel(GV), conduct Qi to the palms or fingers and emit Qi, with the emitting site touching or leaving the treated region. Qi helps vitality exalted, balance kept, and the circulation well-flowed. 2. For that, we made a schedule of joining some of Osteoarthritis patients who usually take anti-Osteoarthritis drugs, dividing them into two of groups. One is EGT-taken(group 1) and the other is not EGT-taken(group 2). 3. For insurance of analytic accuracy, we use the IEMD(Inner Energy Meridian Diagnosis). 4. In conclusion, there was significant differences between two of groups. Especially from the point of view of liver, kidney and spleen meridian pathways.

• Journal of Korean Medical Ki-Gong Academy
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• v.9 no.1
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• pp.1-48
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• 2006

This is a paper on the validity of Extra Gigong Therapy(EGT) on Hypertension patients. We've treated hypertension patients EGT, used IEMD for analysis, so that come to these conclusions. 1. Average value of treatment group was 4.215, this is higher than one of control group. They had differences up to the standard. 2. Hypertension patients are divided into EGT treated group(treatment group) and non-treated one(control group). 3. Light stomach meridian has differences in treatment group and no differences in control group before and after EGT. That means EGT is effective. So does Spleen meridian. 4. With 12 meridians' electric potential values, we come to conclusion that EGT is likely to do hypertension patients good, especially on the point of view of liver, kidney, stomach and spleen meridian pathways. And bibliographies back up in this conclusion. 5. We classified hypertension patients into 4 factors: that is a spiritual factor, a physical factor, an eating factor and a circulation factor. Among these, a physical factor was seen of high frequency. There is a close connection between a physical factor and liver, kidney, spleen meridian pathways. The consequence was that subjects are suburban residents in the prime of time who had overworked.

• Korean Journal of Food Science and Technology
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• v.18 no.5
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• pp.357-363
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• 1986

The thermal conductivity and thermal diffusivity of food are heavity dependent on temperature and composition. The thermal properties of pure component solids were determined by the proposed model at a temperature range of $-40^{\circ}C\;to\;150^{\circ}C$ from the experimental values of 10%, 30% and 60% solid content suspensions. The major components of food products were proteins(albumin, casein, whey protein, meat protein and gluten), lipids (milk fat, vegetable oil, lard and corn oil), carbohydrates (dextrose, lactose, sugar and starch), fibers (cellulose and pectin), all milk salts. A modified probe method was used to measure these properties of pure component suspensions of each major component of food products. General mathematical models which were developed by an optimization technique can be applied to predict the properties of food products.

• Journal of the Korean Society for Advanced Composite Structures
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• v.1 no.3
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• pp.1-9
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• 2010

In this paper, we used various shear deformation functions for modelling isotropic, symmetric composite and sandwich plates discretized by a mixed finite element method based on the Lagrangian/Hermite interpolation functions. These shear deformation theories uses polynomial, trigonometric, hyperbolic and exponential functions through the thickness direction, allowing for zero transverse shear stresses at the top and bottom surfaces of the plate. All shear deformation functions are compared with other available analytical/3D elasticity solutions, are predicted the reasonable accuracy for investigated problems. Particularly, The present results show that the use of exponential shear deformation theory (Karama et al. 2003; Aydogu 2009) provides very good solutions for composite and sandwich plates.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.510-510
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• 2013

탄소나노튜브를 발광층에 첨가하여 Alternating current (AC) 방식으로 구동되는 고분자유기물 소자를 제작하였다. 고분자유기물 소자는 ITO가 코팅된 유리기판을 사용하였으며, 전극으로는 ITO와Al을 사용하고 cyanoethyl pullulan (CRS)의 유전물질과 탄소나노튜브를 함유한 poly[2-methoxy-z5-(2-ethyl-hexyloxy)-1,4-phenylene-vinylene](MEH-PPV) 고분자유기발광물질을 이용하여 4개의 층(ITO/CRS/탄소나노튜브를 함유한 MEH-PPV/Al)으로 고분자유기물 소자를 구성하였다. 소자는 ITO가 코팅된 유리 기판 위에 CRS의 유전층과 탄소나노튜브를 함유한 MEH-PPV의 발광층은 스핀코우터를 이용하여 증착하였으며, Al은 thermal evaporator을 이용하여 증착하였다. 본 연구에서는 AC 방식 고분자유기물 소자에 탄소나노튜브의 함유량을 변경하면서 전압과 전류 특성을 관찰하여 탄소나노튜브가 함유된 소자가 저 전류 구동이 가능한 것을 확인하였으며, 탄소나노튜브를 통한 micro-capacitance 효과의 확인 및 percolation과의 상관관계를 알아보았다. AC 고분자유기물 소자는 가정에서 사용되는 AC전원을 바로 사용할 수 있는 범용성을 가지고 있으며, 탄소나노튜브를 발광층에 첨가함으로 낮은 소비전력으로 고분자유기물 소자를 구동 할 수 있는 장점으로 차세대 디스플레이나 조명으로 그 쓰임새를 기대해본다.