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      • LiDAR 데이터를 이용한 수문지형인자 추출

        김동문,김성훈,김의명 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.4

        Topographic parameter play an important role in determining the nature of water resources and related hydrological modelling.Recently, the research related in analyzing topographic parameter that which are required in hydrological analysis using GIS techniques is achieved.A watershed analysis tend to use a digital elevation model from LiDAR rater than that of extracted traditional map sheet.DEM quality and resolution affect the accuracy of any extracted hydrologic topographic parameters.Therefore, it is demonstrated that a LiDAR-derived DEM with high accuracy and high resolution offers the capability of improving the quality of watershed boundary extracted from DEMs. KeyWords : LiDAR, DEM, Topographic paramenter, Watershed

      • Pearlite성장속도에 미치는 합금원소 첨가효과의 속도론적 고찰

        南勝義,安東勳 弘益大學校 1982 弘大論叢 Vol.14 No.2

        The addition of an alloying element results in remarkable reduction of the rate of pearlite growth. In this paper, the effects of alloying elements on the kinetics of pearlite growth are investigated for Ni, Mn, Si, Cr, Mo. The mechanism for the effect of alloying elements is studied with a data or growth velocity and interlamellar spacing. The most important results in this paper are as follows. Strong carbide forming elements change the boundary (interfacial) diffusion for volume diffusion of carbon in the range of low temperature(below the Tp temperature) because the carbides prevent a cargbon from diffusing by interfacial route. In the systems that involve the elements which are not strong carbide formers, it is thought that the reactions are proceeded by a interfacial diffusion model with an activation energy of about 24,000 cal/mol.

      • 高峰의 經世思想

        黃義東 청주대학교 인문과학연구소 1991 人文科學論集 Vol.10 No.-

        Ko-Bong is in a position to interlink Yi-Hwang(李滉) and Yul-Gok(栗谷) in the Neo-Confucianism of Yi dynasty. He held a controversy with Yi-Iiwang, and contributed greatly to the development of the Neo-Confucianism of Yi-dynasty. And then, He was Concerned about not only the theory of Neo-Confucianism but also the practice of that. Theretore, his Administration thought is very important. Firstly, he asserted the theory of Reformation by gradual progress. This means the preparation of inward-condition for the success of Reformation and the transformation of Human Being. Secondly, his Administration thought is the standard of common sense, but it is excellent considering the limit of times. Thirdly, he attempted to establish public order thought the distinction of truth-falsehood and that of a wise man- a foolish man. Lastly, he emphasised that the opinion of speech was the Key for the welfare of the state, and he maintained extensive opening of speech, which is of importance in our times.

      • 退溪哲學의 理에 관한 考察

        黃義東 청주대학교 인문과학연구소 1987 人文科學論集 Vol.6 No.-

        Yi-Hwang philosophy represents Korean philosophy in company with Yul-Gok(栗谷)philosophy. Yi-Hwang illustrates the form of Existence-structure of all things from I and Ki(氣)as well as the traditional Confucianists. But he attaches great importance to the I. Therefore, the writer intends to examine the I in Yi-Hwang philosophy multilaterally. 1. Yi-Hwang states the relative I in the structure of the profound harmony of I and Ki, in spite of it, he emphasizes the absolute I that can exist without the Ki. 2. Yi-Hwang explains the I as Being-principle and Ought-principle, but he rather puts a stress on the Ought-principle than Being-principle. 3. Yi-Hwang makes plain his I-Ki doctrine in Cosmology and the theory of Human Nature, but he concentrates upon the I in the theory of Human Nature. 4. Yi-Hwang claims the action of the I, in that stand point, he differs from Chutzu(朱子)and Yul-Gok(栗谷). It is the distinctive feature of Yi-Hwang philosophy. But it has some problems logically. Eventually the above things originates from the ethical viewpoint of Yi-Hwang philosophy. Besides, they have the meaning of supplement of Chu-tzu's in sufficiency.

      • 고밀도 플라즈마에 의해 식각된 SrBi_2Ta_2O_9 박막의 표면 반응 연구

        김동표,김창일,장의구 중앙대학교 기술과학연구소 2000 기술과학연구소 논문집 Vol.30 No.-

        본 연구에서 SBT 박막은 Cl_2양을 변화하면서 Cl_2/Ar 가스 플라즈마를 이용하여 식각하였다. 최대 식각 속도는 Cl_2(20%)/Ar(80%) 가스혼합비에서 883A˚/min 이었다. Cl_2 가스양이 증가함에 따라서 SBT 박막의 식각 속도는 감소하였다. 이는 Ar 이온의 물리적 스퍼터링에 의한 영향이 화확 반응에 의한 식각보다 우세하게 작용함을 의미한다. 식각 메커니즘을 규명하기 위하여 optical emission spectroscopy (OES), x-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS)와 atomic force microscopy (AFM) 분석을 하였다. AFM 분석결과에서 Ar이나 Cl12 플라즈마를 이용하여 식각된 시료의 표면 거칠기 rms 값이 식각전의 시료나 Cl_2/Ar 플라즈마로 식각된 시료보다 크다. 이는 식각된 시료에서의 Bi 양의 감소나 비휘발성 식각 잔류물에 의한 영향이다. XPS와 SIMS 분석을 통하여 검증하였다. SBT thin films were etched at different content of Cl_2 in Cl_2/Ar. The maximum etch rate of SBT was 883A˚/min in Cl_2(20%)/Ar(80%). As Cl_2 gas increased in Cl_2/Ar gas plasma, the etch rate decreased. The result indicates that physical sputtering of Ar ion is dominant to chemical reaction in etching SBT thin films. To evaluate the etching mechanism of SBT thin films, optical emission spectroscopy (OES), x-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS) and atomic force microscopy (AFM) were carried out. From the result of AFM, the rms values of etched samples in Ar only or Cl_2 only plasma were higher than that of as-deposited, Cl_2/Ar. This can be illustrated by a decrease of Bi content or nonvolatile etching products(Sr-Cl and Ta-Cl), which are revealed by XPS and SIMS.

      • KCI등재

        Solid Modeling 기법을 응용한 복합곡면 가공에 있어서 공구간섭 제거

        장동규,조시완,양균의 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.2

        Compound surface modeling is widely used for die cavities and punches. A compound surface is defined in 3-D space by specifying the topological relationship of several analytic surface elements and a sculptured surface. A constructive solid geometry scheme is employed to model the analytic compound surface. the desired compound surface can be accomplished by specifying topological relationships in terms of boolean relations between primitives and the sculptured surfaces. Additionally, a method is presented for checking and avoiding the tool interference occurred in machining the compound surface. Using this method the interference of concave, convex, and side region can be checked easily and avoided rapidly.

      • 천연가스 연료공급시스템의 과도 유동에 관한 수치연구

        박의철,차동진 한밭대학교 생산기반기술연구소 2001 생산기반기술연구소 논문집 Vol.1 No.1

        A numerical study has been conducted to characterize the transient pressure and flow in a natural gas supply system of utility gas turbines. The solution domain encompasses the supply gas pressure regulator to the combustor of the gas turbines. Some results produced for the purpose of verification in the study agree quite well with the experimental ones. Then, the transient gas flow in the system is characterized when the opening ratios of the control valves in the system are varied. It is found that the total gas flow of the system decreases noticeably at the moment its combustion mode changes, which would be the reason that its combustion instability momentarily occurs. Results reported in this study may be useful to understand the unsteady behavior of the natural gas supply system.

      • KCI등재

        방사선사진의 인덱스-순서 분석을 통한 치아경조직의 탈염화 검출

        박동현,박영호,김경숙,박정훈,이기자,최삼진,최용석,황의환,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.2

        Purpose : The purpose of this study was to develop the radiographic technique for detecting the demineralization which is known as indication of dental caries. Materials and Methods : This technique was based on the comparing of multiple radiographs which was irradiated by multiple X-ray spectra. For the meaningful comparing, the multiple radiographs were reconstructed to the dosimetrically consistent images using a standard material. The difference of resulting images of same target with multiple spectra represents the difference of response of material as regards the spectra. Results : We have found about 10% of demineralization of dental hard tissues particularly in the proximal region through the analyzing of differences. Conclusion : Most intriguing thing in this investigation was that the method to analyze difference shows us to an anatomic structure of dental hard tissues even if absolute values of optical density were excluded during the procedures.

      • 스포츠 산업 경영의 전망과 미래적 추이 분석

        정의권,성중기,정동화 중앙대학교 스포츠과학연구소 2002 體育硏究 Vol.- No.17

        When we see the modem structure of industry, we’d like to analyse the future and the view of the Sports management with the science. The purpose of this study is that we propose materials in order to improve the quality of human’s life and the management of sports industry. 1. There are a lot of following problems in our future world; environmental pollution, the advancement of science, comparative social circumstances, the variety of value judgement. So it is necessary to study deeply about sports industry and sports management. 2. The scale of sports is so enormous that sports activity plays an important role in human’s leisure and influences on the sports industry. At the same time we have to study about sports management. 3. Sports at a lifetime that is, we must study sports which meet not only the child but also the old at the same time man or woman in the 21st century. 4. The popularization of science has raised economical level of sports in the society of sports industry. According to commercialization of sports, sports market is getting bigger.

      • 기업화 스포츠센터의 발전과정과 전망에 관한 고찰

        정의권,정동화 중앙대학교 스포츠과학연구소 2001 體育硏究 Vol.- No.15

        How to connect the quality of life and the promotion of health with the Leisure Age which is given as a by-product of the modern industrial society is the task of the modern Sports Centers. With the previous developmental process, the objective of this research is to map out the strategy of the industrial sports. 1. The development of sports centers have shown rapid growth by the early 1990s since the '88 Seoul Olympics, and especially have expanded much more through the restucturing period in 1994. 2. The regional distribution of sports centers is concentrated in large cities; for example, among the total number of 184 sports centers in the country, Seoul has 96 sports centers, Kyeong-ki 29, Bu-san 15, Tae-gu 9, In-cheon 8. In particular, there is no sports center in Kangwon-do and Cheon-ra Nam-do. 3. The sports centers are forms of enterprise, which are equipped with spacial and functional facilities for the promotion of health. And the marketability has been expanded and subdivided for the customer-oriented marketing. 4. The prospect of sports centers can be understood through the emergence of distinctive small-sized sports centers, the sports centers for the welfare of employees, the net-work of sports centers for the beauty care, and the sprots centers for the medical care and resort.

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