• Structural Engineering and Mechanics
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• 제54권4호
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• pp.793-807
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• 2015

Constructing the influence lines of forces of statically indeterminate structures is a traditional issue in structural engineering and mechanics. However, the existing kinematic method for establishing these force influence lines is an indirect or mixed approach by combining the force method with the theorem of reciprocal displacements, which is yet inconsistent with the kinematic method for statically determinate structure. This paper proposes the direct kinematic method in conjunction with the load-displacement differential relation for exactly constructing influence lines of reaction and internal forces of indeterminate structures. Firstly, through applying the principle of virtual displacement, the formula for influence lines of reaction and internal forces of indeterminate structure via direct kinematic method is derived based on the released structure. Then, a computational approach with a clear concept and unified procedure as well as wide applicability based on the load-displacement differential relation of beam is suggested to achieve conveniently the closed-form expression of force influence lines, and exactly draw them. Finally, three representative examples for constructing force influence lines of statically indeterminate beams and frame illustrate the superiority of the proposed method.

• The International Journal of Costume Culture
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• 제4권2호
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• pp.94-114
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• 2001

Men's Po of (he Chosun period became simple and stable in shape as the nation moved from its early to late period. Re lines of the external structure of the clothing shows the beauty of the garment. Re lines generally derive their beauty from curved lines, gradually replacing the straight lines of the earlier part of the Chosun period. The linear beauty of the external structure of men's Po is found in the outline and silhouette. Generally in the early Chosun period it could be seen that H-shaped silhouettes, narrowed strips and flexible drapes descending to the ankles were still in use from the period of the Koryo dynasty And in the 17th century, or the mid Chosun period, considerable numbers of H-shaped drapes with wide sleeves and side Moo were seen. At the beginning of the 18th century, voluminous A-shaped outlines appeared. From the late Chosun period through the mid and late Chosun period, or the 18th and 19th centuries, the from silhouette changed from voluminous A-shapes to narrower H-shapes. The beauty of the lines of the external structure of men's Po is due to its harmonising with the straight body lines of men. The straight Git of the early Chosun period harmonises beautifully with the straight Baerae and Doryun and the curved Git of the later Chosun period similarly harmonises with the curved Baerae and Doryun lines. The shape of men's Po has a balance betweon right and left, centering around the Sup lines. The sleeves have the balanced beauty of vertical lines. Git and Sup have beauty through the balance of oblique and straight lines while Baerae and Doryun have similar balances through curves. Jikrung, Chulik, Dapho's side Moo, coat strings, Doryun and sleeves drape, all of which are manufactured by means of plane cutting, Pow together beautifully. Re Git, Sup, and the silhouette and drape of men's Po, which are also manufactured through plane cutting, make the wearer look tall and at the same time express the beauty of mature manhood. The linear beauty shown in men's Po during the Chosun Period have beauty through harmonizing with straight and curved lines, beauty balance, beauty of flow, beutity of emphasis and beauty of optical illusion.

• 한국해양공학회지
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• 제31권3호
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• pp.202-207
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• 2017

This paper presents the results of an experimental study on the motions and mooring characteristics of a floating vertical axis wind turbine system. Based on a comparison of regular wave experiment results, the motions of structures with different types of mooring are almost the same. Based on the tension response results of a regular wave experiment with a catenary mooring system, the mooring lines in front of the structure have a larger tension effect than the back of the structure by the drifted offset of the structure. The dynamic response spectrum of the structure in the irregular wave experiments showed no significant differences in response to differences in the mooring system. As a result of the comparison of the tension response spectra, the mooring lines have a larger value with a drifted offset for the structure, as shown in the previous regular wave experiment. The results of the dynamic response of the structure under irregular wave and wind conditions showed that the heave motion response is influenced by the coupled effect with the mooring lines of the surge and pitch motion due to the drifted offset and steady heeling. In addition, the mooring lines in front of the structure have a very large tension force compared to the mooring lines in back of the structure as a result of the drifted offset of the structure.

• 한국산학기술학회논문지
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• 제14권7호
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• pp.3474-3481
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• 2013

본 논문에서는 결함접지구조와 가유전체 기판구조를 이용하여 새로운 초고주파 대역 전송선로 구조가 제안된다. 결함접지구조는 전송선로의 단위길이당 등가의 인덕턴스를 증가시켜 동일한 선폭일 때 전송선로의 특성 임피던스를 키우면서 선로의 길이를 줄여준다. 가유전체 기판구조는 전송선로의 단위길이당 등가의 커패시턴스를 증가시켜, 동일한 선폭일 때 전송선로의 특성 임피던스를 낮추면서 선로의 길이를 줄여준다. 따라서 결함접지구조와 가유전체 기판구조는 모두 전송선로의 길이를 줄이면서 선폭에 대해서는 상보적인 역할을 한다. 그러므로 두 구조가 결합되면 전송선로의 특성 임피던스는 크게 변하지 않은 채 길이만 더욱 줄일 수 있으므로, 초고주파 회로의 소형화에 크게 유리하다. 본 논문에서는 결함접지구조와 가유전체 기판구조를 모두 결합시킨 $35{\sim}100{\Omega}$ 전송선로를 설계하고, 실제로 제작 및 측정하여 그 결과를 제시하는데, 특성 임피던스의 예측값과 측정값이 잘 일치함을 보인다. 동일한 전기적 길이에 대하여 제안한 전송선로는 Fig.준형 마이크로스트립 전송선로에 비하여 불과 55.4~76.9% 물리적 길이를 갖는다.

• Journal of Advanced Marine Engineering and Technology
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• 제33권1호
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• pp.159-165
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• 2009

In this study, using a periodical ground structure(PGS) on GaAs monolithic microwave integrated circuit(MMIC), transmission line with a high isolation characteristic was developed for application to compact signal/bias lines of highly integrated MMIC. And the origin of the high isolation characteristic was theoretically investigated. The high isolation characteristic was originated from a resonance between adjacent microstrip lines employing PGS. With only a spacing of $20{\mu}m$, the coupled microstrip line employing PGS showed an isolation value of -47 dB at 60 GHz. The frequency range for high isolation was easily controlled by changing the PGS structure. Above results indicate that microstrip lines employing PGS are very useful for application to compact signal/bias lines of highly integrated MMIC requiring a high isolation characteristics between lines. In addition, equivalent circuit employing closed-form equation for the coupled line with PGS was also extracted.

• 한국전기전자재료학회논문지
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• 제28권10호
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• pp.670-675
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• 2015

Degradation diagnosis of cable is one of major issues for operation and maintenance in overhead distribution power lines. The diagnostic system for overhead power lines is composed of three parts in functional aspect - a travelling unit, a sensing unit and a communication unit. Among them, sensor detects the defects such as corrosion and disconnecting of power lines. Performance of sensor is very important, and besides, the size and structure of sensor is restricted for installation to small and lightweight diagnostic system. This paper suggests an optimal eddy current sensor best suit for small and lightweight diagnostic system in consideration of detecting performance, size and ease of installation and so on. Proposed sensor has been designed by Drum core structure and can be applied to the all domestic overhead power lines regardless of the cross-sectional areas. Also, it is showed that results of mock environmental test are satisfied.

• 한국육종학회지
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• 제43권5호
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• pp.430-441
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• 2011

본 연구는 총 50개의 SSR 마커를 이용하여, 찰옥수수 및 종실용 옥수수 핵심집단(찰옥수수 40계통, 종실용 옥수수 40계통)의 자식계통들의 유전적 다양성, 집단구조 및 계통유연관계를 분석하였다. 1. 그 결과 65bp에서 225bp 크기의 범위로 총 242개의 대립단편들을 증폭시켰다. SSR primer들에서 증폭된 대립단편의 수는 최소 2개에서부터 최대 9개까지의 범위로 나타났고, 평균 4.84개가 증폭되었다. 그리고 GD값은 0.420에서 0.854의 범위로 나타났고, 평균 0.654의 값을 나타내었다. 2. 80개의 옥수수 자식계통들의 집단구조를 분석한 결과, 13개의 찰옥수수 자식계통은 group I에 포함되었고, Group II는 7개의 찰옥수수 자식계통과 38개의 종실용 옥수수 자식계통들이 포함되었다. 나머지 22개의 자식계통들은 admixed group에 포함되었으며, 20개 찰옥수수 자식계통과 2개의 종실용 옥수수 자식계통으로 구성되어있다. 3. UPGMA법에 의한 계통유연관계 분석 결과, 80개 옥수수 자식계통들은 유전적 유사성 31.7% 수준에서 크게 3개의 그룹으로 나누어졌다. Group I은 40개의 찰옥수수 자식계통과 11개의 종실용 옥수수 자식계통을 포함하고 있었고, Group II는 27개의 종실용 옥수수 자식계통을, 그리고 Group III은 단지 2개의 종실용 옥수수 자식계통을 포함하고 있었다. 따라서 본 연구의 결과는 앞으로 강원도 농업기술원 옥수수시험장에서 육성한 찰옥수수 및 종실용 옥수수 자식계통들에 대한 유전자원 관리 및 선발 그리고 교배조합 구성 및 예측 등에 유용한 정보를 제공할 것으로 기대된다.

• 한국통신학회논문지
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• 제25권3A호
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• pp.424-429
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• 2000

본 논문에서는 준정적 해석방법을 사용하여 다층 구조에서 유한한 도체 두께를 갖는 비대칭결합 마이크로스트립(ACM: Asymmetric Couple Microstrip) 선로의 특성을 연구하였다. 준정적 해석방법으로서 모드정합법을 이용하였으며, ACM 선로의 특성 임피던스와 유효 유전율 상수가 도체 두께의 함수로 나타나는 결과를 얻었다. 수치해석 결과를 통해서 단층 및 다층구조에서 도체 두께의 변화로 인하여 ACM 선로의 전파특성이 변화되는 것으로 나타났다.

• 전자공학회논문지A
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• 제32A권8호
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• pp.47-55
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• 1995

Proximity-coupled open-end microstrip interconnections in bilevel planar structures are investigated through three-dimensional finite-difference time-domain(3D-FDTD) method. Three types of EMC (electromagnetically coupled) microstriplines are considered, collinear lines, transverse lines and modified EMC structure. From the analyzed results, it is found that these EMC interconnections have the coupling coefficient enough to interconnect lines in bilevel structures over a broad-band. The computed results of the modified EMC structure was compared with measurement from physical model and the computed results of via hole interconnection.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1567_1567
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• 2009

In this article, we deal with the IED(Intelligent Electronic Device) on the EMC aspect. Recognizing how expensive the thorough EMC work will be regarding the entire IED, we focus on the characteristics of RF signals moving along multiple TX-lines in one specified example of the typical IED structure, say, the layer of trace lines. Simplifying the real structure, we run a 3D EM program and analyze the properties of signals on the lines and interference due to the coupling between the neighboring lines.