• Title/Summary/Keyword: Design pattern

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Design and Fabrication of Circularly Polarization Antenna for Electronic Toll Collection System (ETCS용 원형편파 안테나의 설계 및 제작)

  • Lee, Sang-Mok;Yoon, Joong-Han;Kim, Heung-Soo
    • Journal of IKEEE
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    • v.6 no.1 s.10
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    • pp.40-46
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    • 2002
  • In this paper, a microstrip array antenna is designed, fabricated and measured for ETCS(Electronic Toll Collection System). To reduce effect of external propagation environment, we use edge-cuffed element and to obtain wider axial ratio and increased bandwidth, we use the sequential rotation array method. Also to fulfill ETCS, roadside equipment are designed to be provide a radiation pattern which can accurately pinpoint the designated communication area without interference of another lanes. And we make and apply an absorber to the array antenna to reduce SLL(Side Lobe Level). From the measurement, we get that return-loss at center frequency is -20.675dB, axial ratio is 0.35dB and the gain is 20.26dBi. And we found that SLL is reduced.

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Design of Low Cost H.264/AVC Entropy Coding Unit Using Code Table Pattern Analysis (코드 테이블 패턴 분석을 통한 저비용 H.264/AVC 엔트로피 코딩 유닛 설계)

  • Song, Sehyun;Kim, Kichul
    • Journal of IKEEE
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    • v.17 no.3
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    • pp.352-359
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    • 2013
  • This paper proposes an entropy coding unit for H.264/AVC baseline profile. Entropy coding requires code tables for macroblock encoding. There are patterns in codewords of each code tables. In this paper, the patterns between codewords are analyzed to reduce the hardware cost. The entropy coding unit consists of Exp-Golomb unit and CAVLC unit. The Exp-Golomb unit can process five code types in a single unit. It can perform Exp-Golomb processing using only two adders. While typical CAVLC units use various code tables which require large amounts of resources, the sizes of the tables are reduced to about 40% or less of typical CAVLC units using relationships between table elements in the proposed CAVLC unit. After the Exp-Golomb unit and the CAVLC unit generate code values, the entropy unit uses a small size shifter for bit-stream generation while typical methods are barrel shifters.

An intelligent eddy current signal evaluation system to automate the non-destructive testing of steam generator tubes in nuclear power plant

  • Kang, Soon-Ju;Ryu, Chan-Ho;Choi, In-Seon;Kim, Young-Ill;Kim, kill-Yoo;Hur, Young-Hwan;Choi, Seong-Soo;Choi, Baeng-Jae;Woo, Hee-Gon
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10b
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    • pp.74-78
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    • 1992
  • This paper describes an intelligent system to automatic evaluation of eddy current(EC) signal for Inspection of steam generator(SG) tubes in nuclear power plant. Some features of the intelligent system design in the proposed system are : (1) separation of representation scheme ,or event capturing knowledge in EC signal and for structural inspection knowledge in SG tubes inspection; (2) each representation scheme is implemented in different methods, one is syntactic pattern grammar and the other is rule based production. This intelligent system also includes an data base system and an user interface system to support integration of the hybrid knowledge processing methods. The intelligent system based on the proposed concept is useful in simplifying the knowledge elicitation process of the rule based production system, and in increasing the performance in real time signal inspection application.

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An Efficiency Testing Algorithm for Realistic Faults in Dual-Port Memories (이중 포트 메모리의 실제적인 고장을 고려한 효율적인 테스트 알고리즘)

  • Park, Young-Kyu;Yang, Myung-Hoon;Kim, Yong-Joon;Lee, Dae-Yeal;Kang, Sung-Ho
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.2
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    • pp.72-85
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    • 2007
  • The development of memory design and process technology enabled the production of high density memory. However, this increased the complexity of the memory making memory testing more complicated, and as a result, it brought about an increase in memory testing costs. Effective memory test algorithm must detect various types of defects within a short testing time, and especially in the case of port memory test algorithm, it must be able to detect single port memory defects, and all the defects in the dual port memory. The March A2PF algorithm proposed in this paper is an effective test algorithm that detects all types of defects relating to the duel port and single port memory through the short 18N test pattern.

Design and Implementation of a Cloth Simulation System based on Hierarchical Space Subdivision Method (계층적 공간 분할 방법을 이용한 의복 시뮬레이션 시스템의 설계 및 구현)

  • Kim Ju-Ri;Cho Jin-Ei;Joung Suck-Tae;Lee Yong-Ju;Jung Sung-Tae
    • Journal of the Korea Society of Computer and Information
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    • v.9 no.4 s.32
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    • pp.109-116
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    • 2004
  • This paper describes a cloth simulation system for dressing 3D virtual human model with different pieces of clothing. The garments are constructed of cutting patterns seamed together. The system reads a body file and a cutting pattern file and produces a new model dressed with the specified garment by using a physical simulation based on a mass-spring model. For the realistic cloth simulation, it performs collision detection and response between triangles of the 3D human model and the garment. Because the number of triangles of a human model is very large. the collision detection and response requires a lot of time. To overcome this problem, we propose a pruning method which decreases the number of collision detection and response by a space-subdivision method. Experimental results show that the system produces realistic images and makes it possible to sew a garment around a virtual human body in several seconds.

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Analysis of Burnable Poison Effect on Power Distribution using Power Sensitivity Coefficient Concept (출력민감도 계수개념을 이용한 가연성 독붕봉이 출력분포에 미치는 영 향의 분석)

  • Yi, Yu-Han;Oh, Soo-Youl;Seong, Seung-Hwan;Lee, Un-Chul
    • Nuclear Engineering and Technology
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    • v.20 no.1
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    • pp.19-26
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    • 1988
  • The low leakage leading pattern has features as the placement of some fresh fuel assemblies in the core interior to reduce the neutron fluence on the pressure vessel and to enhance the neutron economics. But as fresh fuel assemblies are loaded in the core interior, the local power tends to exceed safety limit due to the high reactivity of the fresh assemblies. Therefore, a large number of burnable poisons must be utilized in a low leakage scheme to suppress the high assembly power as well as the excess reactivity. In this study the effects of burnable poisons are treated as a perturbation on the power distribution, and the 'Power Sensitivity Coefficient' concept is adopted. An application study is performed for cycle 1 of the Korea Nuclear Unit-7 (KNU-7) to justify the usefulness of the reverse depletion method coupled with the above concept. To obtain the optimal burnable poision distribution at the given burnup step, the linear programming technique is adopted. The result shows maximum 4.5% error in the amount of burnable poisons between the calculated and the reference values. It is concluded that the design methodology which consists of the reverse depletion, the power sensitivity coefficient concept, and the linear programming technique can be used to find the optimal turnable poison distribution.

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Design and analysis of two-dimensional binary phase masks for the fabrication of two-and three-dimensional periodic structures (2차원 및 3차원의 주기적인 구조 제작을 위한 2차원 이진 위상마스크의 설계와 분석)

  • 김남식;원영희;고근하;조두진
    • Korean Journal of Optics and Photonics
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    • v.12 no.1
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    • pp.17-24
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    • 2001
  • Two-dimensional binary-phase diffraction gratings which can be employed to fabricate two- and three-dimensional periodic structures are designed and analyzed using rigorous coupled-wave analysis. These gratings serve as phase-masks which generate several diffracted waves from a normally incident beam and thus can produce a periodic interference pattern in space via nearfield holography. The properties of the diffracted beams can be controlled by varying the polarization and wavelength of the incident beam, surface-profile, groove depth and duty cycle of the mask. For the two-dimensional structure, optimum results can be obtained when the diffraction efficiency of the zero-order beam is minimized while that of the first-order maximized. On the other hand, when the diffraction efficiency of the zero-order is appreciable or even greater than other orders, we can obtain a variety of three-dimensional interference patterns which may be used to fabricate photonic crystals of tetragonal-body-centered and hexagonal structures in a submicron scale. scale.

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Research Trends in Light Guide Plates for LED Backlight Units (LED 백라이트유닛 도광판의 연구동향)

  • Park, So Hee;Choi, Eun Seo;Ahn, Sun Young;Shin, Yong Jin
    • Korean Journal of Optics and Photonics
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    • v.28 no.6
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    • pp.314-326
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    • 2017
  • The display, which is closely related to modern life, is being developed as a window on a network connecting individuals, devices, and even other individuals from simple display devices, as the IT industry develops. To achieve a thinner, brighter unit with less consumption for backlighting, the LED light source has applied, and the study of complex light-guiding plates to improve luminance, uniformity, and viewing angle has been initiated. In this paper, we summarize the research results for the scatterers' pattern formation of the light-guiding plate and the arrangement and composition of the light source, which have enabled remarkable development of the LED backlight unit over the last 10 years. In addition, a large-area flat-screen illumination system, applying the light-guiding-plate technology to a currently noteworthy LED light-fixture design, is outlined. Finally, we discuss the direction and way to develop the current technology more progressively.

A Study on Fashion Images according to the Types of the Korean First Ladies (한국 영부인의 역할유형에 따른 패션이미지 연구)

  • Kim, Young-Sam;Kim, Jang-Hyeon;Jun, Yuh-Sun
    • Journal of the Korean Society of Clothing and Textiles
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    • v.36 no.9
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    • pp.1000-1013
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    • 2012
  • This study analyzes public images, role types, and fashion images of Korean First Ladies in modern times to find a correlation of a standard through an analysis of literature reviews. The conclusion of the study is as follows. First, in terms of official functions in formal situations, First Ladies represent a type of customary presidential protocol and offer appealing neat images through a moderate style and simple mode. In other situations, such as non-formal times, they show duty-based roles in regards to the lady of the house as well as the companion of the president that are represent soft and comfortable images through a feminine style and graceful mode. Second, it reflects their tastes and images in the silhouette and colors of Western style clothing through the personal roles and activities of the First Lady. Third, the Korean First Ladies tend to prefer the feminine image of housewife-based assistant that shows that they prefer clothes with a regular repetition and stabilized pattern such as dots and checkered patterns. Fourth, as compared to a previous period, they create a style for bright images and dainty feelings that use a variety of colors and light fabrics that represent many aspects of political assistance with active support.

A Study on the Material of Furniture in Goryeo (고려시대 가구재료 연구)

  • Cho, Sook-Kyung
    • Journal of the Korea Furniture Society
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    • v.25 no.1
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    • pp.19-27
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    • 2014
  • This paper studied the materials of the furniture which the noble men used in Goryeo, based on the furniture material category of solid wood furniture, lacquerware inlaid with mother-of-pearl and hardware. As for the solid wood furniture, the wood and furniture types are inferred based on the documents. The trees used for the wood furniture were zelkova, korean willow, pine, royal paulownia, maidenhair tree, korean pine, chinese juniper and elm. The furniture types were table, chair, wooden bench, small portable table, writing table, and folding screen. As to the types of lacquerware inlaid with mother-of-pearl, most of them were hams with top, which were made of abalone shells. The features of the lacquerware inlaid with mother-of-pearl were in detail and elaborate like the pattern of the full bloomed chrysanthemum. Writing tables were also made of lacquerware as pieces of furniture. Distinctively, the mother-of-pearl furniture material was popular enough to be used even in a horse saddle. Regarding the metal feldspar used as both a practical use and decoration, there are drop handle, hinge, the front basis, and lock seen in the artifacts, which were made of cast iron, bronze, and brass. Their manufacture techniques were eojamoon, bratticing and sheet metal. Through this study of the furniture materials used in Goryeo, it seems that Goryeo furniture focused on the functions rather than on the decorations, and in turn the forms were simple and basic. The technique of mother-of-pearl, a bit elaborate one, was used in the props furniture like kitchen wares, hams, or writing talbes. Probably, the solid wood is inferred to be used in a low wooden bench, a chair, and a table based on the documents.

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