• Title/Summary/Keyword: Reflection Lines

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A Study On Magnetic Fields Reduction Technologies For Power Transmission Line (송전선 자계저감 기법에 관한 연구)

  • Min, Suk-Won;Kim, Min-Ho
    • Proceedings of the KIEE Conference
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    • 2006.10a
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    • pp.162-164
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    • 2006
  • There are concern on possible health effects from exposure to electric and magnetic fields. One reflection of this concern is the considerable controversy, delay, and cost increases involved in the construction of utility lines and facilities. To meet such challenges, in this paper we investigated magnetic fields reduction techniqies such as general compaction, in-span compaction, cruciform, vertical, 3way splits phase, and 4way splits phase. As results, we found 1 spacer in-span compaction was appropriate in Korea in view of effectiveness and economy.

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Recent Developments in the EU Investment Policy : Towards an Investment World Court?

  • Giupponi, Belen Olmos
    • Journal of Arbitration Studies
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    • v.26 no.3
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    • pp.175-230
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    • 2016
  • The controversies that have surrounded the negotiation of both the Comprehensive Economic and Trade Agreement (CETA) and the Transatlantic Trade and Investment Partnership (TTIP) have underlined the difficulties arising out from the adoption of a truly common EU investment policy. Non-governmental organizations have called into question transparency and legitimacy of international investment arbitration during the negotiations. The article presents a reflection about current developments of the EU investment policy addressing, in particular, the criticisms towards the whole investor-to-State system and the EU's efforts in developing a "tailor-made" investment agreement and Investor-to-State Dispute resolution system. Along these lines, the article critically assesses the recently announced proposal for the establishment of an 'Investment Court System' put forward by the EU during the TTIP negotiations.

Photo-imageable Thick-Film Lithography Technology for Embedded Passives Fabrication (내장형 수동소자의 제조를 위한 포토 이미징 후막리소그라피 기술)

  • Lim, Jong-Woo;Kim, Hyo-Tea;Kim, Jong-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.303-303
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    • 2007
  • Photo-imageable thick-film lithography technology was developed for the fabrication of embedded passives such as inductors and capacitors. In this study, photo-imageable dielectric and conductor pastes have apoted a negative type. Sodalime glass wafer, alumina substrate and zero-shrinkage LTCC green tapes were used as substrates. In result, The lithographic patterns were designed as lines and spaces for conductor material, or via-holes for ceramic, LTCC, materials. The scattering and reflection of UV-beam on the substrate had negative effects on fine patterning. The patterning performance was varied with the exposing and developing process conditions, and also varied with the substrate materials. Fine resolution of less then $50/50{\mu}m$ in line and space was obtained, which is difficult in screen printing method.

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Structure and Bonding of Perovskites A($Cu_{1/3}Nb_{2/3}$)$O_3$ (A=Sr, Ba and Pb) and their Series of Mixed Perovskites

  • Park Hyu-Bum;Huh Hwang;Kim Si-Joong
    • Bulletin of the Korean Chemical Society
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    • v.13 no.2
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    • pp.122-127
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    • 1992
  • Some perovskites $A($Cu_{1}3}Nb_{2}3}$)O_3(A=$Sr^{2+}$$, $Ba^{2+}$ and $Pb^{2+}$) and their series of mixed perovskites have been prepared by solid state reaction. Single perovskite phase was obtained in Sr or Ba rich samples, but pyrochlore phase was found in Pb rich samples. The stability of perovskite phase is dependent on the ionicity of bonding as well as the tolerance factor. All the obtained perovskites have tetragonal symmetry distorted by Jahn-Teller effect of $Cu^{2+}$. In the case of $Sr(Cu_{1}3}Nb_{2}3})O_3$, some superlattice lines caused by threefold enlarging of fundamental unit cell were observed. And, the symmetry of B site octahedron and the bonding character of B-O bond have been studied by IR, ESR and diffuse reflection spectroscopy. It appeared that the symmetry and the bonding character are influenced by such factors as the size and the basicity of A cation.

On the Behavior of Membrane Breakwaters in Waves (파랑중 막 구조 방파제의 거동 특성)

  • Cho, I.H.
    • Journal of Korean Port Research
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    • v.8 no.1
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    • pp.17-22
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    • 1994
  • The wave interaction with flexible membrane such as PVC and fabrics is studied to prove its applicability to portable breakwaters. To obtain the wave exciting force acting on flexible membrane, eigen-function expansion method is employed. The effect of flexible is involved in body boundary condition in which x-directional displacement of membrane is obtained by solving the linear membrane equation. Displacement of membrane is assumed to be small compared to wavelength, therefore the tensile force of membrane remains constant. As the numerical examples, transmission and reflection coefficients according to the change of tensile forces are investigated. The hydrodynamic force on membrane, the dynamic tension in the mooring lines and the vertical displacement profile of membrane are also calculated. It is suggested that the flexible membrane can be used to engineering material for the future coastal/ocean applications.

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Enhancement of Signal Transmission Characteristics Using Structural Changes in Silicone Rubber Socket (실리콘 러버 소켓의 구조 변경을 통한 신호 전달 특성 향상)

  • Seona Kim;Moonjung Kim
    • Journal of the Semiconductor & Display Technology
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    • v.23 no.1
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    • pp.104-109
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    • 2024
  • In this paper, we propose structures of a socket that can improve signal transmission characteristics compared to the existing silicone rubber socket. A coaxial rubber socket was proposed to improve signal distortion due to electromagnetic interference between signal lines. And an air gap rubber socket was proposed to improve the degradation of reflection characteristics due to high dielectric constant. Using a 3D electromagnetic field simulator, the S-parameter and crosstalk of the three sockets were compared and the signal transmission characteristics were analyzed. In both coaxial rubber socket and the air gap rubber socket, S-parameter and crosstalk were improved compared to the silicone rubber socket. Among them, the air gap rubber socket was the best for S-parameter, and the coaxial rubber socket was the best for crosstalk.

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The Analysis of Middle Students' Conceptions on the Arrows Representing Reflection and Refraction in the Light Unit of Science Textbooks (빛 단원에서 반사와 굴절을 나타내는 화살표에 대한 중학생들의 개념 조사)

  • Song, Yong-Wook;Kim, Beom-Ki;Paik, Seoung-Hey;Kim, Yong-Jin;Han, Jaeyoung;Chung, Jung-In
    • Journal of Science Education
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    • v.34 no.1
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    • pp.72-83
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    • 2010
  • This study aims to analyze the types of arrows used on the inscriptions in the light unit of 7th grade science textbooks, and to investigate middle students' conceptions on the meaning of the arrows. The types of arrows in 9 science textbooks were analyzed. Based on this analysis, the instrument was developed to access how 7th graders perceive the meaning of arrows. In addition, we interviewed 7th graders, 2 students in high level, 2 in the middle, and 2 in low level by their achievement level, to investigate their perceptions on the meaning of the arrows. We analyzed 4 types of arrow by the process in which the reflected light from the object come into one's eyes. Students tend to perceive the meaning of the solid line and the dotted line of arrows differently according to their achievement level. When the light pathway is represented in which the reflected or refracted light enter into our eyes, it is necessary to describe and teach clearly both the meaning of solid line as the light from the object and the meaning of dotted line as the perception of the existence of the object.

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Investigation of Underground buried Cables based on Ground Penetrating Radar Data (지표 투과 레이더 데이터 기반 지하 매설 케이블 조사)

  • Choi, SungKi;Yoon, Hyung-Koo;Kim, YoungSeok;Kim, Sewon;Choi, Hyun-Jun;Min, Dae-Hong
    • Journal of the Korean Geotechnical Society
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    • v.40 no.2
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    • pp.105-113
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    • 2024
  • Underground buried cables can cause disconnections during the construction of roads and other subterranean structures due to uncertain designs. This paper describes experiments conducted to detect and verify the locations of these cables utilizing ground penetrating radar (GPR). The experiments were carried out at an active road construction site, where cable burial was anticipated. The GPR used operated within a frequency range of 400 MHz to 900 MHz to probe underground structures. The exploration methodology consisted of an initial GPR test to survey the entire area, followed by a secondary test informed by the results of the initial experiment, incorporating a diverse and increased number of lines. The findings confirmed the hyperbolic reflection patterns of cables at consistent locations along the same lines. These patterns were then compared to existing designs to corroborate the presence of cables at the identified locations. This research establishes an effective GPR methodology based on the electromagnetic wave reflection pattern, specifically the hyperbola, to detect difficult-to-locate underground buried cables.

The Characteristics of Landscape Details for Memorialization (기념성을 구현하기 위한 조경디테일의 특성)

  • 이상석
    • Journal of the Korean Institute of Landscape Architecture
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    • v.29 no.5
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    • pp.71-83
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    • 2001
  • The purpose of this study is to find out the characteristics of landscape details in representing symbolic images in memorials on the themes of war, tragedy, and the democratization movement. In considering the characteristics of memorial landscapes, the researcher divided the characteristics of landscape details into 3 analysis categories. They are the symbolic application of landscape elements, the embodiment of landscape details, and the organization of landscape details to represent symbolic images, for example, memory, mourning, reflection, healing, glory, and identity. Among details in 24 memorials designed in or after 1970. 133 symbolic details were selected including 64 items in Korea. The analysis revealed that among 30 elements used by designers for memorialization, walls, ponds, sculptures were used more often than other elements in representing the meaning of mourning, reflection, and healing that are the basic function of memorial. In regard to detail form, the designers used basic shapes like circles, squares and rectangles, horizontal and vertical lines to heighten the symbolic effect of shapes in confined form. Stone and water utilized from nature were also used as main materials because of their materiality meaning of death, eternity, life, and healing. The techniques of using lighting, fire, and sound were introduced to make details more effective. Details were organized in harmony and repetition to represent the flew of time and space in symbolic images. The study identified the following characteristics of memorial landscapes in Korea that were different from other country first, in designing memorials, most designers in Korea have been more focused on the organization of space than the details in memorials, and so, they have been neglecting to deliver symbolic image through detail design, while depending mainly on the introduction of art works. Lastly, because they introduced traditional elements which have little relation with the symbolic image needed, there have been many details which inaccurately represent symbolic meanings.

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Case study on the lake-land combined seismic survey for underground LPG storage construction (LPG 지하저장기지 건설을 위한 수륙혼합 탄성파탐사 사례)

  • Cha Seong-Soo;Park Keun-Pil;Lee Ho-Young;Lee Hee-Il;Kim Ho-Young
    • 한국지구물리탐사학회:학술대회논문집
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    • 2002.09a
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    • pp.101-125
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    • 2002
  • A lake seismic survey was carried out to investigate possible geohazards for construction of the underground LPG storage at Namyang Lake. The proposed survey site has a land-lake combined geography and furthermore water depth of the lake is shallow. Therefore, various seismic methods such as marine single channel high resolution seismic reflection survey, sonobuoy refraction survey, land refraction survey and land-lake combined refraction survey were applied. Total survey amounts are 34 line-km of high resolution lake seismic survey, 14 lines of sonobuoy refraction survey, 890 m of land refraction survey and 8 lines of land-lake combined refraction survey. During the reflection survey, there were severe water reverberations from the lake bottom obscured subsurface profiling. These strong multiple events appeared in most of the survey area except the northern and southern area near the embankment where seems to be accumulated mainly mud dominated depositions. The sonobuoy refraction profiles also showed the same Phenomena as those of reflection survey. Meanwhile the results of the land-lake combined refraction survey showed relatively better qualities. However, the land refraction survey did not so due to low velocity soil layer and electrical noise. Summarized results from the lake seismic survey are that acoustic basement with relatively flat pattern appeared 30m below water level and showed three types of bedrock such as fresh, moderately weathered and weathered type. According to the results of the combined refraction survey, a velocity distribution pattern of the lake bottom shows three types of seismic velocity zone such as >4.5 km/s, 4.5-4.0km/s and <4.0km/s. The major fault lineament in the area showed NW-SE trend which was different from the Landsat image interpretation. A drilling was confirmed estimated faults by seismic survey.

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