• Title/Summary/Keyword: Quality Output

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The Porosity Control Technology of Lap Joint Welding Using Continuous Wave Nd:YAG Laser of the Low Carbon Steel SS41 (저탄소강 SS41 연속파형 Nd:YAG 레이저 겹치기 용접의 기공제어 기술)

  • Lee, Ka Ram;Hwang, Chan Youn;Yang, Yun Seok;Park, Eun Kyeong;Yoo, Young Tae
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.4
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    • pp.665-672
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    • 2013
  • With the development of advanced processing technology, laser processing systems, which require high-quality precision processing, have attracted considerable attention. Although laser equipment is expensive, it enables quick processing and less deformation of materials. This technology is often applied to secondary batteries, which has thus farinvolved the use of argon tungsten inert gas (TIG) welding. However, the welding characteristics of argon TIG welding are not yet good, and a laser is used for welding to address this problem. In this study, lap-joint welding was conducted, and the desired welding characteristics were obtained when the laser power was 1800W and the laser beam travel speed was 1.8 m/min. Lap-joint welding was conducted on Ni-coated SS41. Two cases were compared. No pores were observed in the Ni-coated SS41 lap-joint welding part, and cracks appeared from the lap-joints. Moreover, the pole rod and tap were welded together in a T-joint form to improve the output of the secondary battery. T-joint laser welding showed better welding characteristics than TIG welding.

Crosstalk Reduction of Glasses-free 3D Displays using Multiview Image Processing (다시점 영상처리를 이용한 무안경 3차원 디스플레이의 크로스톡 저감 방법)

  • Kim, Sung-Yeol;Lee, Jin-Sung;Choi, Sang Mi
    • Journal of Broadcast Engineering
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    • v.21 no.1
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    • pp.66-75
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    • 2016
  • In this paper, we present a new method to reduce crosstalk of a glasses-free three-dimensional (3D) display using a multi-view image processing technique. Since crosstalk makes the current view image mixed with its neighboring ones, the output 3D image becomes severely blurred. We apply adaptive depth retargeting and view gradient-based crosstalk inverse filtering onto a multi-view image to minimize crosstalk of the glasses-free 3D display. In addition, overflow and underflow pixels are compensated by epipolar image pixel interpolation so that visual artifacts are minimized. Experimental results show that the proposed method reduces crosstalk more efficiently than the previous work while improving 3D image quality.

Analysis of hydrological characteristics of Yongdam Dam experimental basin (용담댐 시험유역 특성자료분석 연구)

  • Hwang, Eui-Ho;Chae, Hyo-Sok;Lee, Geun-Sang;Koh, Deuk-Koo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2006.05a
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    • pp.1444-1449
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    • 2006
  • Korea is about 70% of all country to mountain, and basin is consisted of various terrain, soil, vegetation, land use etc. because use land as intensive. Also, need basin hydrologic model that can analysis base outflow as well as outflow directly for calculation of discharge to establish irrigation plan. Inconvenient in use method and user interface offer side is causing by way that existing USGS WEASEL runs in PC Arc/Info, and ArcGIS with development of present GIS technology is applied in many fields offering convenience in analysis that use GIS. In this research, wished to develop suitable outflow parameter extraction system, For this, develop pre-processor and post-processor that effectively draw of hydrologic model input data from water resources DB through van example benchimarking, and developed input/output component of GIS base applicable to various hydrologic and water quality model.

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A Study on the New Discharge Logic Device for the Plasma Display Panels (플라즈마 디스플레이 패널을 위한 새로운 방전 논리소자에 관한 연구)

  • 염정덕;정영철
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.1
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    • pp.13-19
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    • 2002
  • The plasma display panel with the electrode structure of new discharge AND gate was proposed and the driving system for experiment was developed. And discharge AND gate operation was verified. Discharge AND gate operated by the operation speed of 8${\mu}\textrm{s}$ and the operation margin of 20V. It was known to be able to control the discharge of the adjoining scan electrode accurately. Because this method uses the DC discharge, the control of the discharge can be facilitated compared with conventional discharge AND gate. Moreover, because the input discharge and the output discharge of AND gate are separate, the display discharge can be prevented from passing AND gate. Therefore it is possible to app1y to the large screen plasma display. And the decrease of contrast ratio does not occur because the scanning discharge does not influence the picture quality.

Design and Implementation of PDA based RFID Recognition System for the Logistics Application (물류응용을 위한 PDA 기반의 RFID 인식 시스템 설계 및 구현)

  • Jung Sung-Hun;Yim Jae-Hong;Kim Gi-Rae
    • Journal of Navigation and Port Research
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    • v.30 no.1 s.107
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    • pp.85-90
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    • 2006
  • RFID(Radio Frequency IDentification) is appearing by point technology by Ubiquitous environment of new paradigm and Logistics' application But, RFID chip of this is high price and short bandwidth, low power and interference etc. can become technological problem This is getting into obstacle in common use. Reader and tag, Embedded software etc.. that are accomplishing standardization are imported paying most expensive royalty. This paper deals with a RFID cognition system that use PDA under ubiquitous environment to apply to Logistics system A RFID cognition system processes input/output of fundamental information attaching a tag onto products. And a RFID cognition system supports quick, correct and sqfe synthetic Logistics managerial system through construction of database. This can minimize logistics costs and improve the quality of customer service. A RFID cognition system has advantage that can widen range of application to area that cognition system of existent fixing style can not do. Also, it can expect economical effect through inexpensive system construction.

Study on the Development of Stepwise Tooth Carving Practice Content Using Augmented Reality Technology and a Three-Dimensional Tutorial Method (증강현실 기술과 삼차원 튜토리얼 방식을 활용한 단계별 치아 형태 조각 실습 컨텐츠 개발과 관련된 융합 연구)

  • Im, Eun-Jeong;Lee, Jae-Gi
    • Journal of the Korea Convergence Society
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    • v.11 no.10
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    • pp.81-88
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    • 2020
  • This purpose of this study is to develop content that enables repetitive carving practice of the maxillary right central incisor (MRCI) based on augmented reality (AR). For a step-by-step practice of achieving the tooth shape, after creation of the storyboard from the square box shape in step 1 to the completed MRCI block in step 16, three-dimensional (3D) modeling data reflecting the characteristics of the mesial, distal, lingual, and labial surface of the MRCI were generated. An application was built in which 3D modeling data were output on the screen of the learner's mobile device, and image markers suitable for 3D modeling in steps 1 to 16 of the MRCI model were respectively generated. Using this information, the learner could carve a high-quality MRCI by repeatedly performing the tooth shape carving exercises. With AR, we intend to contribute to improved tooth morphology carving skills by linking the theory and practical techniques for a beginners in dentistry.

Implementation of Ring Buffer based Massive VLBI Data Stream Input/Output over the Wide Area Network (광역 네트워크 상의 링 버퍼 기반 대용량 VLBI 데이터 스트림 입출력 구현)

  • Song, Min-Gyu;Kim, Hyo-Ryung;Kang, Yong-Woo;Je, Do-Heung;Wi, Seog-Oh;Lee, Sung-Mo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.6
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    • pp.1109-1120
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    • 2019
  • In the field of VLBI, If the quality of the connected network between the VLBI station and the correlation center is ensured, the existing inefficiency of repeatedly storing the observation data in each station and the correlation center can be overcome. In other words, the data center can be unified with the correlation center where data analysis is performed, which can improve data processing speed and productivity. In this paper, we design a massive VLBI data system that directly transmits and stores the observation data stream obtained from the VLBI station to the correlation center via the high - speed network KREONET. Based on this system, VLBI test observations confirmed that the observation data was stored perfectly in the recording system of the correlation center without a single packet loss.

High Reliability Rx Power System Design for Military VoIP Phone (군용 VoIP 전화기를 위한 고신뢰성 Rx 전력 시스템 설계)

  • Park, Kyung-Hwa;Park, Hyun-Jeong;Kim, Hyeon-Sung
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.5
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    • pp.857-864
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    • 2020
  • The multi-functional VoIP phone supports the Ethernet protocol in the TIPS(: Tactical IP Switch), which is one of the sub-systems of the tactical information and communication system (TICN). It provides secured voice / video calls in conjunction with VoIP exchanges and supports differential services such as multi-party calls and command functions. In this paper, improving methods have been proposed to reduce power supply defects in the field of multi-functional VoIP phones. The power supply part was improved by applying TVS of the output voltage inlet of the dedicated adapter of the multi-functional VoIP phone, TVS of the PoE module input, adding blocking diodes, and adding DC / DC converters behind the poly-switch. Also, functional and environmental tests were performed to verify the validity of the proposed methods.

Temperature Compensation of NDIR $CO_{2}$ Gas Sensor Implemented with ASIC Chip (ASIC 칩 내장형 비분산 적외선 이산화탄소 가스센서의 온도보상)

  • Yi, Seung-Hwan;Park, Jong-Seon
    • Journal of the Korean Institute of Gas
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    • v.11 no.1 s.34
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    • pp.40-45
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    • 2007
  • This paper describes NDIR $CO_{2}$ gas sensor that shows the characteristics of temperature compensation. It consists of novel optical cavity that has two elliptical mirrors and a thermopile that includes ASIC chip in the same metal package for the amplification of detector output voltage and temperature sensor. The newly developed sensor module shows high accuracy ($less\;than {\pm}40\;ppm$) throughout the measuring concentration of $CO_{2}$ gas from 0 ppm to 2,000 ppm. After implementing the calculation methods of gas concentration, which is based upon the experimental results, the sensor module shows high accuracy less than ${\pm}5\;ppm$ error throughout the measuring temperature range ($15^{\circ}C\;to\;35$^{\circ}C$) and gas concentrations with self-temperature compensation.

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Implementation of a DSP Based Fuel Cell Hardware Simulator (DSP기반 연료전지 하드웨어 시뮬레이터 구현)

  • Oum, Jun-Hyun;Lim, Young-Cheol;Jung, Young-Gook
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.1
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    • pp.59-68
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    • 2009
  • Fuel cell generators as the distributed generation system with a few hundred watt$\sim$a few hundred kilowatt capacity, can supply the high quality electric power to user as compared with conventional large scale power plants. In this paper, PEMFC(polymer electrolyte membrane fuel cell) generator as micro-source is modelled by using PSIM simulation software and DSP based fuel cell hardware simulator based on the PSIM simulation model is implemented. The relation of fuel cell voltage and current(V-I curve) is linearized by first order function on the ohmic area in voltage-current curve of fuel cell. The implemented system is composed of a PEMFC hardware simulator, an isolated full bridge dc boost converter, and a 60[Hz] voltage source PWM inverter. The voltage-current-power(V-I-P) characteristics of the implemented fuel cell hardware simulator are verified in load variation and transient state and the 60[Hz] output voltage sinusoidal waveform of the PWM inverter is investigated under the resistance load and nonlinear diode load.