• 한국철학논집
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• 제35호
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• pp.43-71
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• 2012

조선 시대의 재지사족은 핵심적인 지배집단이었다. 그들은 전국적으로 분포한 중소 규모의 지주였으며, 유교적 소양을 보유한 지식인 집단이었다. 17세기 이후로는 곳곳에 동성마을을 형성하고, 현조(顯祖)를 내세우면서 지역 사회에 대한 영향력을 행사했다. 그 결과 지역에서의 실질적 주도권을 재지사족이 행사하는 예가 많았다. 이런 면에서 제천 지역의 황강(黃江) 신동(新洞)에 정착한 안동 권씨 화천군파(花川君派) 문중은 대표적인 재지사족이었다. 이 집단은 1675년에 이뤄진 권상하 형제가 이주하면서 형성되었다. 노론 정파의 지도자였던 송시열의 수제자인 권상하는 과거를 외면하고 황강에서 강학에 힘썼으며, 결국은 산림(山林)으로 초빙되어 좌의정으로 제수되기까지 하였다. 권상하의 사후에 그가 가르치던 곳에는 황강서원을 비롯한 기념 시설과 제사 공간이 설치되었다. 이러한 시설들은 권상하가 중시했던 삶의 가치를 후손들이 받아들이는데 이바지했고, 지역 사회에 숭명의리(崇明義理)에 토대를 둔 척사적(斥邪的)인 정서가 자리 잡도록 하는데 이바지했다. 화천군파가 제천 지역에서 재지사족으로 성장하는 과정에 결정적인 역할을 한 인물은 또 다른 인물은 권상하의 조카인 권섭(權燮)이었다. 그는 권상하를 위한 여러 기념시설을 건립하고, 문중의 발전을 위하여 여러 규칙을 제정하였다. 아울러 황강을 넘어서 제천의 신동에 새로운 거주공간을 확보하고, 청풍 단양 문경 등지에 별서(別墅)를 장만하며 거주공간을 넓혀 나갔다. 각각의 공간에는 조상을 모시기 위한 제사 시설도 설치했다. 그 결과 권상하와 권섭의 자손들은 제천 일대에서 대표적인 성씨 집단으로 수백 년간 위세를 누릴 수 있었다. 비록 그들은 서울에 남았던 이들에 비하여 많은 엘리트 관료를 배출할 수는 없었다. 그러나 이러한 재지사족의 성장은 지역 사회의 문화적 성장, 나아가 전 조선 사회의 발전을 가능하게 했다.

• Korean Journal of Mathematics
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• 제6권2호
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• pp.165-172
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• 1998

For a G-map ${\phi}:X{\rightarrow}X$, we define and characterize the Reidemeister number $R_G({\phi})$ of ${\phi}$. Also, we prove that $R_G({\phi})$ is a G-homotopy invariance and we obtain a lower bound of $R_G({\phi})$.

• Korean Journal of Mathematics
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• 제5권2호
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• pp.113-118
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• 1997

According to the Bernoulli-Euler theory of elastic rods the bending energy of the wire is proportional to the total squared curvature of ${\gamma}$, which we will denote by $F({\gamma})=\int_{\gamma}k^2ds$. If the result of J.Langer and D.Singer [3] extend to knotted elastic curve, then we obtain the following. Let {${\gamma},M$} be a closed knotted elastic curve. If the curvature of ${\gamma}$ is nonzero for everywhere, then ${\gamma}$ lies on torus.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
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• pp.145-148
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• 1996

In moving object tracking based on the visual sensory feedback, a prerequisite is to determine which feature or which object is to be tracked and then the feature or the object identification precedes the tracking. In this paper, we focus on the object identification not image feature identification. The target identification is realized by finding out corresponding line segments to the hypothesized model segments of the target. The key idea is the combination of the Mahalanobis distance with the geometrica relationship between model segments and extracted line segments. We demonstrate the robustness and feasibility of the proposed target identification algorithm by a moving vehicle identification and tracking in the video traffic surveillance system over images of a road scene.

• 대한한의학회지
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• 제17권2호
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• pp.237-244
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• 1996

The purpose of this study was to investigate the effect of ILIB(Intravascular Laser Irradiation of blood) on Hyperfibrinogenemia. 20 patients with fibrinogen level of over $400mg／d{\ell}$ were treated with IUB. After !0 times' treatment, changes of fibrinogen level and clinical symptom were observed. The results were as follows: 1. Fibrinogen level was decreased in all of cases. 2. Most cases were suffered from neural symptoms(headache, palpitation, etc), circulatory symptoms (dizziness, numbness, deficiency of sensation, etc), musculo-skeletal symptoms(L.B.P, neck stiffness, arthralgia, etc.), fatigue, pollakiuria, constipation. After treatment, neural and circulatory symptoms were improved considerably.

• Journal of Mechanical Science and Technology
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• 제14권5호
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• pp.483-489
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• 2000

The purpose of this work is to investigate fatigue damage of quasi-isotropic laminates under tensile loading in different directions. Low cycle fatigue tests of $[0/-60/60]_s$ laminates and $[30/-30/90]_s$ laminates were carried out. Material systems used are AS4/Epoxy and AS4/PEEK. The fatigue damage of $[30/-30/90]_s$ is very different from that of $[0/-60/60]_s$. The experimental results are compared with the result obtained from the method for determining strain energy release rate components proposed by the authors. The analytical results were in good agreement with the experimental results. It is proved that the failure criterion based on the strain energy release rate is an appropriate approach to predict the initiation and growth of delaminations under cyclic loading.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.681-682
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• 2006

This paper deals with the preliminary study on the HTSC levitation magnet for MAGLEV operating in persistent current mode (PCM). The high temperature superconducting (HTSC) levitation magnet consists of two single-pancake type coils wound with Bi-2223 wire and a persistent current switch (PCS). The levitation magnet was designed by using 3-D finite element analysis. The suspension system for high-speed electrodynamic suspension (EDS) maglev should operated in persistent current mode. It is important to develop a technology to minimize the joint resistance of splice between two HTSC wires. The PCS was observed with respect to various magnitude of charging current. Based on these results, the levitation system using HTSC wire will be further studied.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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• pp.71-74
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• 2004

A composite-aluminum hybrid joint of composite external fuel tank of an aircraft has been analyzed by a 3-dimensional finite element method. Curvature and contact of the joint structure were considered in the analysis. Yamada-Sun failure criteria was utilized for the failure evaluation. A finite element program ABAQUS was used for the nonlinear contact analysis. The joint structure was predicted to be safe in both the test and analysis.

• 한국정밀공학회지
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• 제12권9호
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• pp.95-103
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• 1995

Recently the trends toward reduction in size of industrial products have increased the application of micro drilling. But micro drilling has still much difficulty so that the needs for active control which give adaptation to controller are expanding. In this paper initial cutting condition was determined for some sorkpieces by experiment and GA-based Fuzzy controller was devised by genetic algorithms and fuzzy inference. The fuzzy inference has been applied to the various prob- lems. However the determination of the membership function is one of the difficult problem. So we introduce a genetic algorithms and propose a self-tuning method of fuzzy membership function. Based on this intelligent control, automation of micro drilling was carried out like the cutting process of skilled machinist.

• 대한치과보철학회지
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• 제40권4호
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• pp.323-334
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• 2002

The purpose of this study is to investigate which current densities and etching times will result in an optimal etching depth and surface roughness when an Ni-Cr-Be alloy is etched with 30% perchloric acid($HClO_4$). For this study, observations were made by means of an optical three-dimensional surface roughness measuring machine and a scanning electron microscope. The etchings took place under the following conditions using current densities of $300mA/cm^2\;450mA/cm^2,\;600mA/cm^2$ and $750mA/cm^2$, and using etching time of three, five, six, seven and nine minutes. Under the conditions, the experiments reached the following conclusions. 1. When the current density is above $450mA/cm^2$ and the etching time is longer than five minutes, the etching depth increased as the current density and etching time increased. And the surface roughness was significantly influenced by the interaction of the current density and etching time. 2. Under the etching conditions of $600mA/cm^2$ and five minutes, the optimal etching depth for a resin cement space and the highest surface roughness for mechanical retention were obtained. The etching depth and surface roughness were $32.86{\mu}m$ and $7.90{\mu}m$, respectively. 3. Observations under the scanning electron microscope showed that both the corrosion at the grain boundary and the corrosion within the grain occurred on the etched surface. It was also observed that the corrosion at the grain boundary became more severe as the current density and etching time increased. In addition. at higher current densities and longer etching times general corrosion appeared.