• Title/Summary/Keyword: Convert

Search Result 2,454, Processing Time 0.03 seconds

Development of the Switching Mode Conversion Type Pulse Charger for the Lead Battery of Solar Cell Generator Equipment by Fly-Back Converter Method (플라이백 컨버터방법에 의한 태양광발전설비의 납축전지 스위칭모드 전환형 펄스충전기 개발)

  • Shin, Choon-Shik;An, Young-Joo;Kim, Dong-Wan
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.58 no.1
    • /
    • pp.20-26
    • /
    • 2009
  • In this paper, the switching mode conversion type pulse charger by fly-back converter method for lead battery of the solar cell generator equipment is proposed. And we propose the control circuit and design method of insulated switching mode convert type pulse charger by fly-back convert method in the lead battery. The proposed system can minimize the current consumption by digital pulse. Also the proposed system can generate the constant 10[KHz] frequency, transmit the signal with main control system in the power control system. And it supervises the state of lead battery using one chip micro processor. The proposed the switching mode conversion type pulse charger by the fly-back converter method can charge fast and stabilize lead battery with nominal value 12[V], 20[AH]. Also we propose the design procedure of the power control circuit for turn ratio of fly-back inductor and determining method of values such as the charging current, bulk current, partial current, over current value and fixed charging voltage. The experiment results for the voltage and current wave for partial, bulk, over and fixed charging period show the good charging effect and performance. And the PCB and internal coupling diagram of the switching mode conversion type pulse charger by fly-back converter method is presented.

Development of a System to Convert a 3D Mesh Model in STL Format into OBJ Format (STL 3D 형식의 메쉬 모델을 형식으로 OBJ 변환하는 시스템 개발)

  • Yeo, Changmo;Park, Chanseok;Mun, Duhwan
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.17 no.3
    • /
    • pp.78-86
    • /
    • 2018
  • The 3D mesh model is used in various fields, such as virtual reality, shape-based searching, 3D simulation, reverse engineering, 3D printing, and laser scanning. There are various formats for the 3D mesh model, but STL and OBJ are the most typical. Since application systems support different 3D mesh formats, developing technology for converting 3D mesh models from one format into another is necessary to ensure data interoperability among systems. In this paper, we propose a method to convert a 3D mesh model in STL format into the OBJ format. We performed the basic design of the conversion system and developed a prototype, then verified the proposed method by experimentally converting an STL file into an OBJ file for test cases using this prototype.

Development of High Efficiency DC-DC Converter Circuit Topology for Renewable Energy Application (신재생에너지 연계용 고효율 승압형 DC-DC Converter 회로 토폴로지 개발)

  • Jung, Tae-Uk;Kim, Ju-Yong
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.24 no.1
    • /
    • pp.105-111
    • /
    • 2010
  • This article studies the design of DC-DC Converter to convert low-voltage energy sources generated from renewable power like battery power, photovoltaic power, or fuel cells into high-voltage ones. The circuit topology of H-bridge Converter to convert input voltage, 24[V], into out voltage, 400[V], was realized through applying phase shift angle control so as to manage electric power and voltage in the output side. The advantages of the converter system suggested are the low cost as well as current stress reduction, high efficiency, reliability, and simplified maintenance. It is also found that the system is highly useful to produce residential electric power.

Development of Ship Route Track System Based on Digital Sea Chart with the Capability of Precise Coordinate Analysis of GPS

  • Kang, In-Joon;Kang, Ho-Yun;Chang, Yong-Ku;Mun, Do-Yeoul
    • Korean Journal of Geomatics
    • /
    • v.3 no.1
    • /
    • pp.7-14
    • /
    • 2003
  • For GIS to land and sea in Korea, GIS on land was almost completed with big cities by NGIS(National Geographic Information System) business. However, MGIS(Marine Geographic Information System) being constructed by the National Oceanographic Research Institute is still constructing geography information and definition of attribute information and real condition. We are being studied on research to get maximized the ripple effect linking GPS and Navigation techniques on GIS. GPS in accuracy is divided into navigation and precise surveying equipment. Now, GPS technology has been developed very much and low price GPS equipments are introducing. But expense on GPS equipment is high yet. Therefore, GPS equipment for navigation is used on cheap GPS equipment in a car or ship. In this paper, the author used algorithm to convert ellipsoid coordinate between WGS84 and Bessel ellipsoid and to analyze map projection between BESSEL ellipsoid and UTM plane coordinate system. And the author developed ship navigation system with cheap GPS equipment using algorithm of ellipsoid conversion and map projection. The author proposed the necessity on constructing MGIS to manage many ships.

  • PDF

IBEM analyses on half-cell potential measurement for NDE of rebar corrosion

  • Kyung, Je-Woon;Tae, Sung-Ho;Lee, Han-Seung;Alver, Yalcin;Yoo, Jo-Hyeong
    • Computers and Concrete
    • /
    • v.4 no.4
    • /
    • pp.285-298
    • /
    • 2007
  • Corrosion of Reinforcement (rebar) is nondestructively estimated by the half-cell potential measurement. As is the case with other nondestructive testings (NDT), understanding of the underlying principles should be clarified in order to obtain meaningful results. Therefore, the measurement of potentials in concrete is analytically investigated. The effect of internal defects on the potentials measured is clarified numerically by the boundary element method (BEM). Thus, a simplified inversion by BEM is applied to convert the potentials on concrete surface to those on rebars, taking into account the concrete resistivity. Because the potentials measured on concrete surface are so sensitive to moisture content, concrete resistivity and surface condition, an inverse procedure to convert the potentials on concrete surface into those on rebars is developed on the basis of BEM. It is found that ASTM criterion is practically applicable to estimate corrosion from the potential values converted. In experiments, an applicability of the procedure is examined by accelerated corrosion tests of reinforced concrete (RC) slabs. For practical use, the procedure is developed where results of IBEM are visualized by VRML (Virtual Reality modeling Language) in three-dimensional space.

Development of Traffic Centralized Control System Based on Protocol Redirection for DB Protection (DB 보호를 위한 Protocol Redirection기반 트래픽 중앙통제시스템 개발)

  • Su, Yang-Jin;Lee, Jae-Pil;Park, Cheon-O;Lee, Deok-Gyu;Chang, Hang-Bae
    • Journal of Korea Multimedia Society
    • /
    • v.13 no.8
    • /
    • pp.1212-1220
    • /
    • 2010
  • The technologies of domestic user programs are not enough to convert address convert information, which was collected via port redirection server, to user traffic. Generally traffic redirection technology is a special purpose technology for I/O traffic via network device. L4 switch needs various additional costs and devices to achieve this special purpose. To solve this problem, there appears need for a central management of control and monitoring by centralizing traffic at one position regardless of network structure and it is necessary to realize redirection function of switch at network layer. Therefore this study offer development of traffic central control system through protocol redirection of client-side.

Comments Classification System using Topic Signature (Topic Signature를 이용한 댓글 분류 시스템)

  • Bae, Min-Young;Cha, Jeong-Won
    • Journal of KIISE:Software and Applications
    • /
    • v.35 no.12
    • /
    • pp.774-779
    • /
    • 2008
  • In this work, we describe comments classification system using topic signature. Topic signature is widely used for selecting feature in document classification and summarization. Comments are short and have so many word spacing errors, special characters. We firstly convert comments into 7-gram. We consider the 7-gram as sentence. We convert the 7-gram into 3-gram. We consider the 3-gram as word. We select key feature using topic signature and classify new inputs by the Naive Bayesian method. From the result of experiments, we can see that the proposed method is outstanding over the previous methods.

POST-LAUNCH RADIOMETRIC CALIBRATION OF KOMPSAT2 HIGH RESOLUTION IMAGE

  • Yoon, Jong-Suk;Lee, Kyu-Sung;Chi, Jun-Hwa;Lee, Dong-Han
    • Proceedings of the KSRS Conference
    • /
    • v.1
    • /
    • pp.402-405
    • /
    • 2006
  • Radiometric calibration of optical image data is necessary to convert raw digital number (DN) value of each pixel into a physically meaningful measurement (radiance). To extract rather quantitative information regarding biophysical characteristics of the earth surface materials, radiometric calibration is often essential procedure. A sensor detects the radiation of sunlight interacted atmospheric constituents. Therefore, the amount of the energy reaching at the sensor is quite different from the initial amount reflected from the surface. To achieve the target reflectance after atmospheric correct, an initial step is to convert DN value to at-sensor radiance. A linear model, the simplest radiometric model, is applied to averaged spectral radiance for this conversion. This study purposes to analyze the sensitivity of several factors affecting on radiance for carrying out absolute radiometric calibration of panchromatic images from KOMPSAT2 launched at July, 2006. MODTRAN is used to calculate radiance at sensor and reflectance of target is measured by a portable spectro-radiometer at the same time the satellite is passing the target for the radiometric calibration. As using different contents of materials composing of atmosphere, the differences of radiance are investigated. Because the spectral sensitivity of panchromatic images of KOMPSAT2 ranges from 500 to 900 nm, the materials causing scattering in visible range are mainly considered to analyze the sensitivity. According to the verified sensitivity, direct measurement can be recommenced for absolute radiometric calibration.

  • PDF

Converting Interfaces on Application-specific Network-on-chip

  • Han, Kyuseung;Lee, Jae-Jin;Lee, Woojoo
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.17 no.4
    • /
    • pp.505-513
    • /
    • 2017
  • As mobile systems are performing various functionality in the IoT (Internet of Things) era, network-on-chip (NoC) plays a pivotal role to support communication between the tens and in the future potentially hundreds of interacting modules in system-on-chips (SoCs). Owing to intensive research efforts more than a decade, NoCs are now widely adopted in various SoC designs. Especially, studies on application-specific NoCs (ASNoCs) that consider the heterogeneous nature of modern SoCs contribute a significant share to use of NoCs in actual SoCs, i.e., ASNoC connects non-uniform processing units, memory, and other intellectual properties (IPs) using flexible router positions and communication paths. Although it is not difficult to find the prior works on ASNoC synthesis and optimization, little research has addressed the issues how to convert different protocols and data widths to make a NoC compatible with various IPs. Thus, in this paper, we address important issues on ASNoC implementation to support and convert multiple interfaces. Based on the in-depth discussions, we finally introduce our FPGA-proven full-custom ASNoC.

Changes of Oligosaccharide in Soymilk with Mixed Cultures of Lactobacillus acidophilus and Saccharomyces uvarum (Lactobacillus acidophilus와 Saccharomyces uvarum의 혼합배양에 의한 대두유의 당 변화)

  • Kong, In-Soo;Kong, Jai-Yul;Yu, Ju-Hyun
    • Korean Journal of Food Science and Technology
    • /
    • v.24 no.6
    • /
    • pp.586-591
    • /
    • 1992
  • The oligosaccharide metabolism in soymilk was investigated by mixed culture with Lactobacillus acidophilus and Saccharomyces uvarum. When Saccharomyces uvarum was cultured in soywhey, change of oligosaccharide could be shown apparently. However, Lactobacillus acidophilus could not utilize oligosaccharide in soywhey for growth and lactic acid production. During the fermentation of mixed culture with Lactobacillus acidophilus and Saccharomyces uvarum, Saccaharomyces uvarum was supposed to convert oligosaccharide to monosaccharide first and then Lactobacillus acidophilus to convert these produced monosaccharide to lactic acid.

  • PDF