• Title/Summary/Keyword: low point

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Low Power Architecture for Floating Point Adder (부동소수점 덧셈 연사기의 저전력화 구조)

  • 김윤환;박인철
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.1089-1092
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    • 1998
  • Conventional floating-point adders have one data-path that is used for all operations. This paper describes a floatingpoint adder eeveloped for low power consumption, which has three data-paths one of which is selected according to the exponent difference. The first is applied to the case that the absolute exponent difference (AED) of two operands is less than 1, and the second is for 1

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Designing High Power Amp for CDMA-Repeater used Fuzzy Logic (퍼지로직을 이용한 CDMA 중계기의 High Power Amp 설계)

  • Kim, Sung-Sik;Cho, Hyun-Chan;Oh, Chang-Heon;Lee, Kyu-Young
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2003.09b
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    • pp.118-121
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    • 2003
  • Generally, the repeater in CDMA(Code Division Multiple Access) included HPA(HI-Power Amplifier) to amplifier communication signals. Also , HPA contained PD(Predistortor) to maintain the linearization of amplifier characteristics. A configuration component of PD have been used electricity nonlinear devices such that diode. But this diode takes many influences at the circumstance temperature. Consequently, it can't maintain output linearization, and drop the communication quality. The manufacturer set bias of the circuit to the manual at the first out of ware-house low But the Q-point changes according to the change of the high temperature or low temperature. Therefore, we designed a system to maintain the Q-point by FDM(Fuzzy Decision Maker) in this paper.

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AKARI INFRARED CAMERA SURVEY OF THE LARGE MAGELLANIC CLOUD

  • Shimonishi, T.;Kato, D.;Ita, Y.;Onaka, T.;AKARI/IRC LMC team
    • Publications of The Korean Astronomical Society
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    • v.32 no.1
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    • pp.83-85
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    • 2017
  • We conducted an unbiased near- to mid-infrared imaging and spectroscopic survey of the Large Magellanic Cloud (LMC) as a part of the AKARI Mission Program "Large-area Survey of the LMC" (LSLMC, PI: T. Onaka). An area of about 10 square degrees of the LMC was observed by five photometric bands (3.2, 7, 11, 15, and $24{\mu}m$) and a low-resolution slitless prism ($2-5{\mu}m$, R ~20) equipped with AKARI /IRC. We constructed and publicly released photometric and spectroscopic catalogues of point sources in the LMC based on the survey data. The catalogues provide a large number of near-infrared spectral data, coupled with complementary broadband photometric data. Combined use of the present AKARI LSLMC catalogues with other infrared point source catalogues of the LMC possesses scientific potential that can be applied to various astronomical studies.

Rapid Manufacturing of Microscale Thin-walled Structures by Phase Change Workholding Method (상변화 고정방식에 의한 마이크로 박벽 구조물의 쾌속제작)

  • Shin, Bo-Sung
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.9 s.174
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    • pp.188-193
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    • 2005
  • To provide the various machining materials with excellent quality and dimensional accuracy, high -speed machining is very useful tool as one of the most effective rapid manufacturing processes. However, high-speed machining is not suitable for microscale thin-walled structures because of the lack of the structure stiffness to resist the cutting force. A new method which is able to make a very thin-walled structure rapidly will be proposed in this paper. This method is composed two processes, high-speed machining and filling process. Strong workholding force comes out of the solidification of filling materials. Low-melting point metal alloys are used in order to minimize the thermal effect during phase change and to hold arbitrary shape thin-walled structures quickly during high-speed machining. To verify the usefulness of this method, we will show some applications, for examples thin -wall cylinders and hemispherical shells, and compare the experimental results to analyze the dimensional accuracy of typical parts of the structures.

A Study of Solar Cell Module using Conductive Film Bonding (Conductive Film를 적용한 태양전지 모듈에 관한 연구)

  • Park, Jung-Cheul;Yang, Yeon-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.4
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    • pp.250-254
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    • 2016
  • In this paper, solar-cell modules were fabricated by low-temperature bonding method of construction using CF. CF adhesive strength of cells at 180 degree using 3bus bar structure was measured average 2.4N. As the bonding temperature got higher, Voc and Iscwas increased. And at $185^{\circ}C$, Rseries was measured 0.013[${\Omega}$] which is the highest point. At $185^{\circ}C$, 2N and 6sec in bonding time, $P_{max}$ was measured 3.954[W], fillfactor was measured 67.36[%] and efficiency was measured13.178[%] the highest point.

Simultaneous analysis method of BTEX and TPH in soil (토양중 BTEX와 TPH의 동시분석법에 관한 연구)

  • 신호상;박치후
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2000.05a
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    • pp.3-8
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    • 2000
  • A simple and rapid simultaneous analysis method of BTEX and TPH in soil was developed. 5g of soil sample were mixed with sodium sulfate and then extracted with 10 mL of mixture of acetone and dichloromethane (1:1). Extraction was performed for 10 min in sonicator and analysis was with GC-FID. The detection limits of BTEX and TPH was 0.8 and 10 mg/kg, respectively. The analytical recoveries were >90% for all BTEX and TPH. Low boiling point fuels and high boiling point fuels are consistently reproduced within RSD 7%. The analysis results show very simple and rapid quantitation of BTEX and TPH in soil sample with low RSD.

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Ionic Wind Generator With Third Electrode (3전극형 이온풍 발생장치)

  • Hwang, Deok-Hyun;Jung, Hoi-Won;Moon, Jae-Duk
    • Proceedings of the KIEE Conference
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    • 2008.05a
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    • pp.139-140
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    • 2008
  • Cooling systems for electronic equipments are becoming more important. Cooling technologies using natural and forced convection are limited and operated in very low efficiency. A corona discharge is utilized as the driving mechanism for anair pump, which allows for airflow generation with low noise and no moving parts. However they do not enhance the flow rate and overcome the control mechanism of the pump. In this study a point-mesh type air pump, with a third electro de installed near the corona point, has been proposed and investigated by focusing on elevating the ionic wind velocity and power yield. As a result, the significantly enhanced ionic wind velocity and tremendously increased power yield can be obtained with the proposed air pump system.

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SIZE OF THE CLUSTERS UNDER LOW DENSITY ZERO-RANGE INVARIANT MEASURES

  • Jeon, In-Tae
    • Communications of the Korean Mathematical Society
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    • v.20 no.4
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    • pp.813-826
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    • 2005
  • Regarding all particles at a fixed site as a cluster, the size of the largest cluster under the zero range invariant measures is well studied by Jeon et al.[5] for the case of density one. Here, the density of the finite zero-range process is given by the ratio between the number m of particles and the number n of sites. In this paper, we study the lower density case, i.e., the case m = o(n). Especially, when m ~ $n^{\beta}$,0 < ${\beta}$ < 1, we show that there is an interesting cutoff point around $\beta$ = 1/2.

Gait Control on Slope Way using Zero Moment Point for Robot (Zero Moment Point를 이용한 이족 보행 로봇의 경사로 걸음새 제어에 관한 연구)

  • Um, Seung-Hyun;Lim, Mee-Seub;Lim, Joon-Hong
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.530-532
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    • 2006
  • In this paper, we propose stable walking algorithm using ZMP for the biped robot in the slope-way. At first, we define discrete state variables that classified stable area and unstable area by center of mass from ZMP during slope-way walking. For the stable walking gait, the discrete state controller for determining the high-level and low-level decision making are designed. The high-level decision making is composed of the discrete state variables; left foot support phase, right foot support phase, flat-way, and slope-way. Then the continuous state controller is implemented for the low-level decision making using ZMP.

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Feasibility Study on Environment-friendly Project to Improve Habitability in National Rental Apartment - focused on Gwangju City - (국민임대주택 주거환경 개선을 위한 친환경사업의 타당성 분석 - 광주광역시를 대상으로 -)

  • Park, Hyeon-Ku;Lee, Hyun-Chul
    • Journal of the Korean housing association
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    • v.20 no.5
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    • pp.23-30
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    • 2009
  • In case of national rental apartment, habitability is generally evaluated low comparing with typical apartments. So, researches and investment are required to increase the residential environment. In this point of view, present study aims to suggest the basic data for improvement of homeless masses' dwelling level through economic feasibility analysis. Firstly national rental apartment, which habitability is considered to be low in the point of environment-friendly, welfare, and convenience, is chosen as objective. Secondly environment-friendly project items including project flow were set up, and then basic model was formed to evaluate economic feasibility through priority survey to residents. In result, priority for two items among six different proposals were higher than the others. This result could be useful when trying to increase the dwelling level of national rental apartment being planned to construct in future.