• Title/Summary/Keyword: Clamp

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Reproduction of the Dyeing Technique Used for the Small Flower Pattern Clamp Resist Dyed Fine Tabby in Amitabha of 1302 (1302년 아미타불복장 소화문협힐견(小花紋��纈絹) 염색기법 재현)

  • Choi, jungim;Sim, Yeon-ok
    • Korean Journal of Heritage: History & Science
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    • v.52 no.2
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    • pp.254-267
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    • 2019
  • Clamp resist dyeing is a resist dyeing technique in which a fabric is sandwiched between two or more pieces of woodcarving and then a pattern is expressed by dyeing. Records from nine years of King Heungdeok's reign during the Unified Silla dynasty show that the use of the clamp resist dyeing technique was banned for different garments. This was only for garments of YOOKDUPUMNYEO (六頭品女) or OHDUPUMNYEO (五頭品女). Given this, it can be assumed that clamp resisted fabrics were widely used, and the technique had been established during the Unified Silla dynasty or before. However, only the term can be found in the records. Neither its definition nor how this technique was used is explained. Also, it is difficult to assume the types and features of clamp resist dyeing due to a lack of materials. A small number of relics from the Goryeo dynasty still remain, though. Craft techniques have developed through international exchanges and have changed according to respective nations' circumstances including politics, economics, society, and culture. Hence, this research analyzed documents and relics from China and Japan, two countries neighboring the Republic of Korea, and studied the different types and features of clamp resist dyeing techniques. Clamp resist dyeing techniques were divided into monochromatic or multichromatic according to the number of colors that represented patterns, rather than according to the respective nations' features. They were also classified into mono, bilateral symmetry, or vertical-bilateral symmetry according to the structure of the patterns. Through the study of examples of inherited or reproduced dyeing techniques in China and Japan, it was confirmed that different engraving techniques, including relief, openwork, intaglio fit for the feature of a pattern and the number of colors, were applied in order to vividly represent patterns on fabric. Using small flower pattern clamp resist dyed fine tabby in Amitabha of 1302, the only relic showing its patterns and colors in Korea, as the experiment subject, this research successfully reproduced a clamp resist dyeing technique through a successful experiment based on the basic materials from the dyeing technique case study. Due to the significance of the experiment on a clamp resist dyeing technique that stopped its transmission and shows the features of the technique, this study is expected to be a basic resource that can be used for future reproductions of multichromatic clamp resist dyeing techniques. Also, it is expected to be helpful in widening and recreating the world of Korean pattern dyeing with modern dyeing techniques.

A Study on the Design of the High Power Active Clamp ZVS Flyback Converter for Semiconductor Plasma Etching System (반도체 플라즈마 용융장치용 고출력 능동 클램프 ZVS 플라이백 컨버터 설계에 관한 연구)

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    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.400-403
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    • 2000
  • This paper deals with the active clamp ZVS flyback converter for semiconductor plasma etching system. The proposed converter has the characteristics of the good power facter low switching noise and efficiency improvement. The characteristics are verified through simulation results. Furthermore the ringing effect due to output capacitance of the main switch can be eliminated by use of active clamp circuit.

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Structural Analysis of Vehicle Battery Post Terminal Clamp Using FEM (FEM을 이용한 자동차용 배터리 포스트 터미널 클램프의 구조해석)

  • Kim, Yong-Tae;Park, Jong-Min;Kim, Sung-Gaun
    • Proceedings of the KAIS Fall Conference
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    • 2011.05b
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    • pp.966-969
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    • 2011
  • 본 논문에서는 자동차용 Battery Post Terminal Clamp의 응력감소를 위한 설계에 있어, ANSYS Workbench 11.0을 이용한 유한요소 구조해석을 하였다. 체결 시 볼트 조임에 따라 가해지는 힘에 따른 응력집중 및 변형을 고려하였고, Battery Post Terminal Clamp에 응력이 집중되어 소성변형이 예상되는 부분에 대한 형상을 변형 하였을 때, 발생 응력이 극한 인장 강도 이하로 감소됨을 확인하였다.

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Wide Input Range Active Clamp Forward Converter Design (넓은 입력전압 능동 클램프 포워드 컨버터 설계)

  • Chun, Moon-Il;Kim, Chang-Sun;Ma, Byung-In
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.64-65
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    • 2008
  • The topology of active clamp forward converter provides ZVS characteristic and also the stress of voltage and current is smaller than that of the conventional forward converters. The benefits of this technique include a higher efficiency at a high switching frequency, lower EMI/RFI. In this paper, the active clamp forward converter is designed for operation in wide range voltage and has 19.5V/120W ratings with efficiency more than 90%.

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A Review on the Development of Hold Clamp for Feeder Distribution Line (급전분기선 지지 크램프 개발에 대한 검토)

  • Park, Weon-Chan;Lee, Jae-Bong;Oh, Sung-Hyo;Park, Jong-Hak
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.1898-1903
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    • 2010
  • The hold clamp which is for holding feeder distribution line in direct current can be lengthened its span of life by inserting insulators(EDPM rubber) through improving its function such as preventing damage from temperature change and electric corrosion. This paper reviews the development background, design, manufacture and performance assessment of the hold clamp inserting insulators to prevent circulating current.

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Characteristics of Boost Input Type Active Clamp Forward ZVS Converter (Boost 입력형 능동클램프 Forward ZVS Converter)

  • Oh Yong-Seung;Kim Hee-Jun
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.386-389
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    • 2002
  • This paper proposes the boost input type active clamp forward ZVS(zero voltage switching) DC-DC converter which can provide high efficiency and improved EMI characteristics. Moreover, it has active clamp circuit for reducing the voltage stress and zero voltage switching technique for minimizing switching loss. The detailed operation principles and the simulation results are presented.

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Design of Compact and Efficient Interleaved Active Clamp ZVS Forward Converter for Modular Power Processor Distributed Power System

  • Moon, Gun-Woo
    • Journal of Electrical Engineering and information Science
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    • v.3 no.3
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    • pp.366-372
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    • 1998
  • A high efficiency interleaved active clamp forward converter with self driven synchronous rectifiers for a modular power processor is presented. To simplify the gate drive circuits, N-P MOSFETs coupled active clamp method is used. An efficiency about 90% for the load range of 50-100% is achieved. The details of design for the power stage and current mode control circuit are provided, and also some experimental results are given.

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Large-Signal Transient Analysis of a Self-Driven Active-Clamp Forward Converter (자기 구동 능동 클램프 포워드 컨버터의 대신호 과도 특성 해석)

  • Bong Sang-Cheol;Kim Hee-Jun
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1235-1238
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    • 2004
  • This paper presents the large-signal transient analysis of a self-driven active-clamp forward converter, eliminating the extra drive circuit for the active clamp switch. The operation principle of the converter was presented and experiential results were used to verify the analyzed results. A 50-W prototype converter built and tested it. From the tested results, input transient response and load transient response of the converter were established.

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Control Characteristics of Boost input type active clamp DC-DC converter (Boost 입력형 능동 클램프 DC-DC 컨버터의 제어특성)

  • Ceong Cin-Beom;Kim Hee-Jun
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.510-513
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    • 2001
  • In this paper, an application of asymmetrical duty control method to a boost input type active clamp DC-DC converter is discussed. In order to verify the discussed results, a 50W prototype converter is built and is tested. Through the experimental results an asymmetrical controlled boost input type active clamp converter is validated.

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A Development of Active Clamp Forward Converter for low Rated Power LDC (Active Clamp 방식의 포워드 컨버터를 이용한 소용량 LDC)

  • Bang, HyoJin;Kim, HeonHee;Lee, JongHyeok;Kwon, TaeSuk
    • Proceedings of the KIPE Conference
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    • 2014.07a
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    • pp.403-404
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    • 2014
  • 전기 자동차 및 하이브리드 자동차는 차량의 12V 부하에 전원을 공급하고 12V 배터리를 충전시키기 위해 DC/DC 컨버터를 사용한다. 이 DC/DC컨버터를 LDC(Low voltage DC/DC Converter)라 한다. 본 논문에서는 Active Clamp 방식의 포워드 컨버터를 이용하여 소용량 LDC를 개발한 내용을 소개 하였다.

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