• Title/Summary/Keyword: d-q method

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CONVERGENCE OF NEWTON'S METHOD FOR SOLVING A NONLINEAR MATRIX EQUATION

  • Meng, Jie;Lee, Hyun-Jung;Kim, Hyun-Min
    • East Asian mathematical journal
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    • v.32 no.1
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    • pp.13-25
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    • 2016
  • We consider the nonlinear matrix equation $X^p+AX^qB+CXD+E=0$, where p and q are positive integers, A, B and E are $n{\times}n$ nonnegative matrices, C and D are arbitrary $n{\times}n$ real matrices. A sufficient condition for the existence of the elementwise minimal nonnegative solution is derived. The monotone convergence of Newton's method for solving the equation is considered. Several numerical examples to show the efficiency of the proposed Newton's method are presented.

Efficiency of Livestock Farming Wastewater Treatment by Trickling Filters (撒水濾床法에 依한 畜産廢水의 處理效果에 관한 연구)

  • Ahu, Soo Mi
    • Journal of Environmental Health Sciences
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    • v.11 no.2
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    • pp.17-27
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    • 1985
  • The objectives of this study is to examine efficiency of swinery wastewater treatment by trickling filters' pilot plant. The results of this study are as follows: 1. The characteristics of sample. The BOD$_5$ was from 2,450 to 2,880mg/l, COD(KMnO$_4$ acid method) was from 910 to 1,064mg/l, and SS was from 920 to 990mg/l. The pH of influent was from 7.3 to 7.6, and the temperature of water was from 17.0$\circ$C to 22.5$\circ$C. 2. For experiment by recirculation, the BODs removal efficiency is 65.2% at recirculation ratio (r)=0, and 70.7% at r=1. The ramoval efficiency of this study is higher than NRC formula of U.S.A.. The recirculation is not significant effect on removal efficiency. 3. For experiment by hydraulic load, the BOD$_5$ removal rate decreased from 73.1% at $3.1m^3/m^2\cdot d$ to 65.3% at $9.2m^3/m^2\cdot d$. The design formula of this study which shows the removal rate of soluble BOD is $Le/Li =10^{-0.24} D/Q^{0.24}$ (Q: hydraulic load, D: depth of filter). 4. For experiment by organic load, the BOD$_5$ removal rate is increased from 70.2% at $0.77kg/m^3\cdot d$ to 75.4% at $4.28kg/m^3\cdot d$. We can obtain the straight line y=0.749 x (y: removed BOD, x :applied BOD) by the least squares method. 5. We can know that trickling filters is strong with the hydraulic load and the organic matter shock load. Here, we can judge that trickling filters is a good method for the treatment of swinery wastewater which containing high concentrated organic matter.

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A Time Slot Allocation Method of UWB Distributed MAC Protocol for Fair QoS Provisionings to High Speed Multimedia Services in Wireless Home Networks (무선 홈 네트워크에서 고속 멀티미디어 서비스의 Fair QoS 제공을 위한 UWB Distributed MAC 프로토콜의 타임 슬롯 할당 방안)

  • Hur, Kyeong;Sohn, Won-Sung
    • Journal of Korea Multimedia Society
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    • v.12 no.3
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    • pp.419-426
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    • 2009
  • The WiMedia Alliance has specified a Distributed Medium Access Control (D-MAC) protocol based on UWB for high speed wireless home networks and WPANs. The WiMedia D-MAC fundamentally removes the problems of the centralized MAC revealed at IEEE 802.15.3 MAC, by adopting a distributed architecture. However, there is no completely distributed method for allocating fair data rates to all traffic streams by considering each stream's QoS parameter. In this paper, a novel fair distributed QoS admission control method is proposed. The proposed method is a fair, adaptive QoS provisioning method, by allocating time slots to devices according to the current traffic load condition, through executing only a proposed single satisfaction of QoS (SoQ) algorithm at each device.

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The PV System Modeling Based on the PSCAD/EMTDC (PSCAD/EMTDC를 이용한 태양광발전(PV) 모델링에 관한 연구)

  • Jeon, Jintaek;Rho, Daeseok;Kim, Chanhyeok;Wang, Yongpeel
    • Journal of the Korea Convergence Society
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    • v.2 no.3
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    • pp.15-23
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    • 2011
  • This paper deals with the analysis for the operation characteristic of PV 3 phase inverter, considering the state equation through d-q coordinates transformation, and proposes an algorithm of controlling current using PI(Proportional Integral) controller to control the output and the theory algorithm of sinusoidal PWM method to design inverter. And also this paper performs PV modelling using PSCAD/EMTDC S/W which is commonly used in analysis of distribution system and confirms effectiveness of the modelling proposed in this paper by analyzing and comparing the EMTDC/PSCAD simulation result with the theoretical method.

A Study about The Taxi Driver's Car Accident Characteristics (택시 운전자의 교통사고 야기 성향 분석에 관한 연구)

  • Jang, Seok Yong;Jung, Heon Young;Lee, Won Gyu
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.2D
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    • pp.191-203
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    • 2008
  • According to a characteristic analysis of traffic accidents of industrial vehicles (RTSA 2007), the occurrence rate and lethality per 10,000 vehicles is 6.7 times higher and 5.3 times higher than that of non-industrial vehicles respectively. For the recent 10 years, in contrast to the 1.5% decrease of the annual rate of entire traffic accidents, the accident rate of industrial vehicles have been increasing 2.0% on the annual average. For the recent 10 years, the accidents of a freight truck and bus have been steadily falling off. But, in the case of a taxi, it has constantly been rising 5.6%. In these situations, the countermeasures to decrease the accident rate are suggested by grasping the inclination of taxi drivers through Q analysis which is character and psychology analysis method.

The Development of Men's Dress Form for Pattern Making (패턴메이킹을 위한 남성(男性) 인대개발(開發)에 관(關)한 연구(硏究))

  • Yoo, Hyun;Shim, Boo-Ja
    • Journal of Fashion Business
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    • v.10 no.5
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    • pp.159-179
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    • 2006
  • This research checked about the necessity for the development of men's dress forms in the first investigation for the educational circle and the men's wear industry. Somatotype characteristics were analyzed in the second investigation of body measurement with the subjects of 200 male adults in their twenties residing in Busan. The following are the results of the present research to develop male dress forms for patternmaking: 1. In the group analysis for the characterization of front body types, three somatotypes were found and named H, Semi X, and Y. In the cluster analysis of side body types, four types were identified: D, I, d, and q. In the combination of front and lateral body types, four kinds were chosen: semi X-I, semi X-q, semi Y-I, and Y-q. 2. Through the comparison of plane figures by the plaster method as well as horizontal and vertical cross sections by the sliding gauge method, semi X-I was finally chosen as the standard somatotype for male dress form development. 3. Compared with the sliding gauge method of the present dress forms, the research dress form reflected better the shapes of the parts of the back and hips and the position of the waist, especially for males in their 20's. In addition, the dress form in the current research had superior points in all the items of clothing evaluation. Based on the above results, the sizes and models of the men's dress forms for patternmaking were developed.

C.A.D. and Characteristics of High Frequency Induction Heating Load Circuit (고주파 유도가열 부하회로의 C.AcD와그 발)

  • Ju-Hong Kim;Ki-Hwan Eom
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.34 no.4
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    • pp.153-153
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    • 1985
  • A method of computer aided design (C.A.D.) is proposed to analize a load circuit of a high frequency induction heating. Various formulas are derived from the properity of the heating load, which is useful for the design of heating materials. A load circuit which is designed by the proposed C.A.D. is realized and tested. The experimental results show in good agreement with the theoritical analysies. Especially the result reveal that the power transfer efficiency increases as the Q and coupling coefficient of the work coil increase.

Enhancement of IPDR of SOA-MZI Wavelength Converter with Pre-amplifier Using a CW-HB (CW-HB를 이용하는 전치증폭기를 가진 SOA-MZI 파장변환기에서 IPDR 개선)

  • Kim Joo-Youp;Han Sang-Kook
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.1A
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    • pp.11-15
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    • 2006
  • A pre-amplified semiconductor optical amplifier-Mach-Zehnder interferometer(SOA-MZI) wavelength converter (WC) using a continuous wave-holding beam(CW-HB) is proposed and experimentally demonstrated at 10Gb/s. The proposed scheme achieves not only enhancement of input power dynamic range(IPDR) to over 20dB but also higher Q parameter of about 2 to 3 by no output signal distortion and higher extinction ratio(ER) of about 2dB to 5dB by low noise figure (NF), compared with the bias current control method.

The Direct Digital Frequency Synthesizer of Parallel Type Using the Differential Quantization (차동 양자화를 사용한 병렬 방식의 직접 디지털 주파수 합성기)

  • Kim, Chong-Il;Lee, Yun-Sik;Lee, Eui-Kwon
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.6 no.2
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    • pp.126-137
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    • 2007
  • In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer(DDFS) is proposed. And we design the phase-to-sine converter using the phase accumulator of parallel type for generating the high frequency. The new ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine is saved by the quantized-ROM(Q-ROM) and the differential ROM(D-ROM). So the total size of the ROM in the proposed DDFS is significantly reduced compared to the original ROM. The ROM compression ratio of 67.5% is achieved by this method. Also, the power consumption is decreased according to the ROM size reduction.

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Design and implementation of 3 kW Photovoltaic Power Conditioning System using a Current based Maximum Power Point Tracking (전류형 MPPT를 이용한 3 kW 태양광 인버터 시스템 제어기 설계 및 구현)

  • Cha, Han-Ju;Lee, Sang-Hoey;Kim, Jae-Eon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.10
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    • pp.1796-1801
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    • 2008
  • In this paper, a new current based maximum power point tracking (CMPPT) method is proposed for a single phase photovoltaic power conditioning system and the current based MPPT modifies incremental conductance method. The current based MPPT method makes the entire control structure of the power conditioning system simple and uses an inherent current source characteristic of solar cell array. In addition, digital phase locked loop using an all pass filter is introduced to detect phase of grid voltage as well as peak voltage. Controllers about dc/dc boost converter, dc-link voltage, dc/ac inverter is designed for a coordinated operation. Furthermore, PI current control using a pseudo synchronous d-q transformation is employed for grid current control with unity power factor. 3kW prototype photovoltaic power conditioning system is built and its experimental results are given to verify the effectiveness of the proposed control schemes.