• 제목/요약/키워드: Drop Handle

검색결과 26건 처리시간 0.025초

A Study of Drop Handles Design

  • Cho, Sook-Kyung;Moon, Sun-Ok
    • 한국가구학회지
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    • 제21권3호
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    • pp.253-260
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    • 2010
  • The drop handle in the Chosun-Dynasty played a role lifting up the cabinet and box which was attached to and besides this had the decoration function. The scope of this study should include the drop handles from the $18^{th}$ century up to now by investigating and analyzing their definition & function and furthermore the types of their designs. The object of the study was the drop handle having 2 golden fixing parts which are definitive difference from ring or loop, and the design typology of drop handle was concentrated on the handle part, and it can be classified in two types. The one is the figuration of bow, bat, bamboo, fish and bird and so on from the motive of nature on the handle part, and the other one is the drop handle of the simple ㄷ-shape, the temple-symbol shape or geometrical forms. According to the analysis of relics & literature from the past it was found that there were more quantitative nature-motive figurations than the geometrical forms. The nature-motive figurations were again classified in box-, bat-, cloud- bamboo-, fish- and bird-type, and the geometrical forms in ㄷ-shape, the temple-symbol shape and others. The cases applied to furniture are roughly divided into the front-attached type and the side-attached type. In comparison of the drop handle in the Chosun-Dynasty with that of modern times, ㄷ-shape and bow-type keep the long tradition of the drop handles despite of the constructive change partly. Ring-type is similar to the just ring or loop of the part and drop handle with one golden fixing part, while the knob-type shows almost same forms in the past as well as in the modern times. Which type among handles in the modern times has little connection with the past is the reclaimed type, and it was showed in the Chosun-Dynasty and also is showed up to now identically that the man-made hole on the front side of the drawer for the function as handle.

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고전압 Non Punch Through IGBT 및 Field Stop IGBT 최적화 설계에 관한 연구 (The Optimal Design of High Voltage Non Punch Through IGBT and Field Stop IGBT)

  • 강이구
    • 한국전기전자재료학회논문지
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    • 제30권4호
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    • pp.214-217
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    • 2017
  • An IGBT (insulated gate bipolar transistor) device has an excellent current-conducting capability. It has been widely employed as a switching device to use in power supplies, converters, solar inverters, and household appliances or the like, designed to handle high power. The aim with IGBT is to meet the requirements for use in ideal power semiconductor devices with a high breakdown voltage, an on-state voltage drop, a high switching speed, and high reliability for power-device applications. In general, the concentration of the drift region decreases when the breakdown voltage increases, but the on-resistance and other characteristics should be reduced to improve the breakdown voltage and on-state voltage drop characteristics by optimizing the design and structure changes. In this paper, using the T-CAD, we designed the NPT-IGBT (non punch-through IGBT) and FS-IGBT (field stop IGBT) and analyzed the electrical characteristics of those devices. Our analysis of the electrical characteristics showed that the FS-IGBT was superior to the NPT-IGBT in terms of the on-state voltage drop.

한국전통가구의 금속 손잡이 영문표기 연구 - 한국 및 서구를 중심으로 - (A Study on Terminology of Metal Handles in Traditional Korean Furniture - Focusing on Korean and Western Furniture -)

  • 문선옥
    • 한국가구학회지
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    • 제23권4호
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    • pp.449-459
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    • 2012
  • The article aims to making a comparison between traditional Korean and Western furniture metal handles to give the detail information of the handle terms by analyzing the related literature including internet and interviews. In terms of that, the Korean and Western metal handles are compared in the types, components, materials, methods, and terms affecting the development made by the craftsmen before the Industrial Revolution about the mid or late 18th century. As a result, first, ring and drop pull handles were mostly and wooden knobs were a little used to open the furniture doors and drawers. The Korean drop pulls, Deulswae, came out after the ring pulls, Gori, while the Western drops called loop or bail handles as well, came out before the ring pulls. Second, the components were composed by ring, Gori, loop or bail, Deulswae, Post, Baemok, washer, Baemokbatchim, and backplate, Deulswaebatchim. Most of the Western handles were fastened by the bolt and nut, while the post of two strips, Baemok, fastened the Korean metal handles. Third, the metal handles were created of brass and iron mostly, gilded gold and silver. Forth, the method were largely used by casting, engraving, forging, plating, and hammering in the Korean handles, and by casting, molding, engraving, and stamped in the Western handles. Finally, the terms such as "knobs, pulls, drops, ring and drop pulls, loop or bail handles, posts, washers, backplate, casting, molding, engraving, forging, plating, and stamped" were clarified by the two comparison in Korean and English.

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천연색 LED 정보표시 시스템의 휘도보정 제어장치 (Controlling Brightness Compensation of Full Color LED Vision)

  • 황현화;임형군;박정환;이종하
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2005년도 추계종합학술대회
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    • pp.1291-1296
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    • 2005
  • In this paper, we prevent a display quality drop for image of characteristics brightness ununiformity depend on LED use to LED vision. It is about that method also a control system development equipped with brightness compensation function of LED vision which is done easily for LED set up of LED vision. Generally, It is calculate driving current value is attended by each brightness to brightness characteristics mathematical function establish by "Y=aX+b", When is doing brightness value for "Y", driving current value for "X", brightness compensation value by using time for "b", characteristics value for "a" ground with characteristics curve of LED. So much, First It is create brightness data of each pixel take a photograph red, green and blue of LED vision. Second It is get average error about each pixel which get average brightness value of entire. Last, It is handle a complicated for about gradationally regulation to color and brightness of image send to LED vision. Also It raise the whole average brightness value of vision adjust for "b" value to solve brightness drop problem of LED using the long time.

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친환경 접촉점화 추진제 점화 성능 평가 (Evaluation of Ignition Performance of Green Hypergolic Propellant)

  • 김선진;신민규;차정열;고영성
    • 항공우주시스템공학회지
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    • 제17권1호
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    • pp.51-58
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    • 2023
  • 별도의 점화원 없이 스스로 점화가 가능한 접촉점화 추진제는 부식성과 독성으로 인하여 취급의 어려움이 있다. 따라서 독성이 적거나 없는 친환경 접촉점화 추진제의 개발이 필요하며, 본 연구에는 친환경 접촉점화 추진제의 기초 연구를 수행하였다. 산화제로 95%의 과산화수소, 연료로 CNU_HGFv1를 사용하였으며 액적 낙하 시험, 점화 시험 및 연소 시험을 통하여 추진제의 점화 및 연소 특성을 확인하였다. 액적 낙하 시험 결과 점화지연 시간은 9.7ms 이며, 점화시험에서는 약 27ms로 추진제로 사용하기에 충분히 빠른 것을 확인하였다. 연소시험 결과 약 11.7bar에서 연소 효율 95.4~98.1%를 달성하였으며, 하드스타트 및 연소 불안정 없이 빠르고 안정적인 연소가 가능함을 확인하였다.

레벨셋 기법을 이용한 전기습윤 현상의 동적 거동에 대한 해석 (ANALYSIS OF ELECTROWETTING DYNAMICS WITH CONSERVATIVE LEVEL SET METHOD)

  • 박준권;홍지우;강관형
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2009년 추계학술대회논문집
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    • pp.84-87
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    • 2009
  • Electrowetting is a versatile tool to handle tiny droplets and forms a backbone of digital microfluidics. Numerical analysis is necessary to fully understand the dynamics of electrowetting, especially in designing electrowetting-based devices, such as liquid lenses and reflective displays. We developed a numerical method to analyze the general contact-line problems, incorporating dynamic contact angle models. The method is based on the conservative level set method to capture the interface of two fluids without loss of mass. We applied the method to the analysis of spreading process of a sessile droplet for step input voltages and oscillation of the droplet for alternating input voltages in electrowetting. The result was compared with experimental data. It is shown that contact line friction significantly affects the contact line motion and the oscillation amplitude. The pinning process of contact line was well represented by including the hysteresis effect in the contact angle models.

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MMMP: A MAC Protocol to Ensure QoS for Multimedia Traffic over Multi-hop Ad Hoc Networks

  • Kumar, Sunil;Sarkar, Mahasweta;Gurajala, Supraja;Matyjas, John D.
    • Journal of Information Processing Systems
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    • 제4권2호
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    • pp.41-52
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    • 2008
  • In this paper, we discuss a novel reservation-based, asynchronous MAC protocol called 'Multi-rate Multi-hop MAC Protocol' (MMMP) for multi-hop ad hoc networks that provides QoS guarantees for multimedia traffic. MMMP achieves this by providing service differentiation for multirate real-time traffic (both constant and variable bit rate traffic) and guaranteeing a bounded end-to-end delay for the same while still catering to the throughput requirements of non real time traffic. In addition, it administers bandwidth preservation via a feature called 'Smart Drop' and implements efficient bandwidth usage through a mechanism called 'Release Bandwidth'. Simulation results on the QualNet simulator indicate that MMMP outperforms IEEE 802.11 on all performance metrics and can efficiently handle a large range of traffic intensity. It also outperforms other similar state-of-the-art MAC protocols.

등속도로 하강중인 Rotating Parachute의 공력특성에 관한 수치 해법 연구 (A Numerical Study of Aerodynamic Characteristics for a Rotating Parachute in Steady Descending Motion)

  • 제상언;정성기;곽상혁;명노신;조태환
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2005년도 춘계 학술대회논문집
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    • pp.119-122
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    • 2005
  • In this paper a method for analysing aerodynamic characteristics of a rotating parachute in steady descending motion is presented. Because of a complex geometric configuration of the parachute associated with side vents and discontinuous skirts, special procedure was adopted th handle the geometry in the analysis. A panel method was successfully applied to the present problem and yielded good results using above procedure. A CFD code using the full Navier-Stokes equations was also applied and provided good results. Parachute free drop and wind tunnel tests were performed to determine the fully developed canopy configuration and aerodynamic characteristics. The method can be used for optimizing the parachute size and side vent configurations in the design period.

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등속도로 하강중인 회전 낙하산의 공력특성에 관한 수치적 연구 (A NUMERICAL STUDY ON AERODYNAMIC CHARACTERISTICS OF A ROTATING PARACHUTE IN STEADY DESCENDING MOTION)

  • 제상언;정성기;곽상혁;명노신;조태환
    • 한국전산유체공학회지
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    • 제11권1호
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    • pp.52-56
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    • 2006
  • In this paper a method for analysing aerodynamic characteristics of a rotating parachute in steady descending motion is presented Because of a complex geometric configuration of the parachute associated with side vents and discontinuous skirts, special procedure was adopted to handle the geometry in the analysis. A panel method was successfully applied to the present problem and yielded good results using above procedure. A CFD code using the full Navier-Stokes equations was also applied and produced good results. Parachute free drop and wind tunnel tests were performed to determine the fully developed canopy configuration and aerodynamic characteristics. The method can be used for optimizing the parachute size and side vent configurations.

산화속도 및 회수율 향상을 위한 고효율 장치 핵심 메커니즘 설계 (Design on Main Mechanism of High Throughput Device for Enhancement of Oxidation and Recover Rate)

  • 김영환;박병석;정재후;윤지섭;황정식
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2008년도 춘계학술대회 논문집
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    • pp.473-476
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    • 2008
  • In this paper, we designed the main mechanism of high throughput device for rod-cuts of spent fuel. For this, we analyzed the mechanical methods(slitting, ball mill, roller straightening) and chemical methods(muffle furnace, rotary kiln). As the results, methods of ball drop and rotary drum for concepts design were selected in the analysis step. For enhancement of oxidation rate, we devised the blades on the reactor with mesh type. Also, for enhancement of decladding rate, we designed ball size and rotation reactor with mesh type and devised the vacuum system for fission products. Mechanisms of oxidation and recovery can simultaneously handle the rod-cuts of spent fuel and independently recover. The results of mechanism design can be used for scale-up of high throughput device.

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