• Title/Summary/Keyword: Shaping

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A trellis shaping on multi-dimensional constellation (다차원 신호집합에서의 트렐리스 쉐이핑)

  • 윤석현;이영조;문태현;고영훈;홍대식;강창언
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.10
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    • pp.12-21
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    • 1996
  • The trellis shaping is the method of selecting a minimum weight sequence from an equivalent class of possible transmitted sequences. It is perforemed by searching through the trellis diagram of a shaping convolutional code Cs. A shaping gain of the order of 1dB may be obtained with a simple 4-state shaping code. But when the rellis shaping is applied to multi-dimensional constellation, the shaping gain is decreased and the transmission delay is increased, which make it difficult to apply the trellis shaping to multi-dimensional constellation. In this paper, in order to solve these problems, the shell mapping algorithm is used for the mapper in the proposed trellis shaping. The simulatio result shows that the proposed trellis shaping is better than coventional trellis shaping to multi-dimensional constellation. In this paper, in order to solve these problems, the shell mapping on multi-dimensional costellation with respect to shaping gain and transmission delay. And the constellation expansion ratio (CER) and the capacity of transmitted injformation are identical to those of conventional trellis shaping on multi-dimensional constellation.

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Application of Input Shaping Method to Industrial Cranes (산업용 크레인에서의 입력성형기법 응용)

  • Park, Sang-Won;Hong, Seong-Wook
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.9
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    • pp.1032-1039
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    • 2011
  • This paper presents results of input shaping to industrial cranes. A brief theoretical background for input shaping is described. Several examples of input shaping application to sway regulation for industrial cranes are presented. The presented results show that input shaping is very useful for industrial cranes.

Robust multivariable control of tandem cold mills (연속 냉간 압연시스템의 강인한 다변수 제어)

  • Kim, J.S.;Kim, C.M.;Kwak, J.H.
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.5
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    • pp.66-74
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    • 1994
  • A loop-shaping LQ controller is synthesized for tandem cold mills. And a new loop- shaping technique is suggested for LQ controller design. The suggested loop-shaping LQ control system is compared with the standard loop-shaping LQ control system. The simulation results show that the theickness and interstand tension control accuracy of tandem cold mills can be improved by the compensated loop-shaping LQ controller.

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Loop-shaping LQ controller design for tandem cold mills (연속 냉간 압연시스템을 위한 루프형성 LQ 제어기 설계)

  • 김종식;김철민;이원호;곽재호
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.987-993
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    • 1993
  • A loop-shaping LQ controller is synthesized for tandem cold mills. And a new loop-shaping technique is suggested for LQ controller design. The suggested loop-shaping LQ control system is compared with the standard loop-shaping LQ control system. The simulation results show that the thickness and interstand tension control accuracy of tandem cold mills can be improved by the compensated loop-shaping LQ controller.

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Vanity and Body Shaping Management of Middle School, High School, and College Female Students in Ulsan City

  • Seo, Jeong-Hee
    • Journal of Community Nutrition
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    • v.8 no.3
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    • pp.134-141
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    • 2006
  • The purpose of this study was to examine and understand the level of vanity and body shaping management and the relationships among related variables. The data were collected from about 140 middle school girls, 186 high school girls, and 194 college female students in Ulsan City using a self-administered questionnaire. The questionnaire included questions such as general characteristics of the subjects, vanity, and body shaping management. There were statistically significant differences in the 4 vanity sub-scales except physical concern and the body shaping management among the school groups(middle school, high school, college) and socio-economic status groups(low, middle, high). Socio-economic status, physical concern and view, and age were affected significantly on the body shaping management. Moderate vanity and body shaping management can prevent obesity and motivate personal development. A nutrition education program for excessive groups in the vanity and body shaping management needs to be developed.

A shaping algorithm considering cell delay and buffer size (지연 및 버퍼 크기를 고려한 셀 간격 조정 알고리즘)

  • Kwak, Dong-Yong;Han, Yong-Min;Kwon, Yool;Park, Hong-Shik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.11
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    • pp.2828-2835
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    • 1996
  • In this paper we propose a new shaping algorithm which can control the shaping delay and the output buffer size based on the leaky bucket counter with a threshold value. This paper assumes that input traffic of the proposed shaping algorithm is the worst case traffic tolerated by the continuous leaky bucket algorithm and claracterizes traffic patterns that can depart from our shaping algorithm. We also compare shaping delay and output buffer size of the proposed algorithm with the existing shaping algorithm without a threshold value. Our results show that the proposed shaping algorithm can easily manage the shaping delay and output buffer size than any other mechanism.

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Input shaping filtering methods for the control of structurally flexible long-reach manipulators (구조적으로 유연하고 긴 로봇 매니퓰레이터의 제어를 위한 입력 Shaping 필터링 방법)

  • 황동환;권동수
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.1
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    • pp.123-130
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    • 1996
  • Due to high payload capacity and high length-to -cross-section ratio requirements, long-reach manipulator systems are expected to exhibit significant structural flexibility. To avoid structural vibrations during operations, various types of input shaping filtering methods have been investigated. A robust notch filtering method and an impulse shaping filtering method were investigated and implemented. In addition, two very different approaches have been developed and compared. One new approach, referred to as a

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Comparative Study of the Mechanical Property of Shaping and WholeGarment Knit Wear - Focused on Armhole Part in Knit Pullover - (봉제형과 무봉제형 니트웨어 제품의 역학적 특성 비교 연구 - 니트 풀오버의 암홀부분을 중심으로 -)

  • Choi, Wonjung;Lee, Yoojin
    • Journal of Fashion Business
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    • v.17 no.2
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    • pp.179-196
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    • 2013
  • This research is about the mechanical properties of knit pullover of Shaping and WholeGarment according to structured patterns and form of the armhole. For the study 12 samples are prepared under different conditions and through comparative analysis of each sample's armhole around armpit in basic properties, tensile strength & elongation and residual elongation after repeated extensions, the conclusion is as follows. As a result of comparing basic properties of structured pattern of Shaping and WholeGarment samples, in all structured patterns Shaping samples weighed more. According to the comparative analysis of tensile strength & elongation of Shaping and WholeGarment samples, Machi on both sides of WholeGarment samples showed the highest strength. By comparing outcome of residual elongation by structured pattern of Shaping and WholeGarment samples, both types were observed to have the residual elongation increase in the order of Plain

Electromagnetic Structure Design Study of Fault-Tolerant Interior Permanent Magnet Machines for Electric Vehicles Using Harmonic Order Shaping

  • Liu, Guohai;Zeng, Yu;Zhao, Wenxiang;Chen, Qian
    • Journal of Magnetics
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    • v.21 no.4
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    • pp.561-569
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    • 2016
  • Although pretty methods have been proposed to reduce torque ripple, they generally suffer from the decreased torque density. This paper will investigate the spoke-type interior permanent magnet (IPM) machine with shaping methods, including the sinusoidal (SIN), the inverse cosine (ICS), the sinusoidal with third harmonic (SIN+3rd), and the inverse cosine with third harmonic (ICS+3rd). In order to obtain low torque ripple and high torque density, the shaping method applied in rotor and stator at the same time, termed as the dual-shaping method, is proposed. This method is analytically derived and further confirmed by finite element method (FEM). It turns out that the ICS and ICS+3rd shaping methods are more suitable for outer rotors, while the SIN and the SIN+3rd shaping method should be used in inner stators. The original machine, the singular shaped machines and the dual-shaped machines on electromagnetic performances are compared for evaluation. The results verify that the dual-shaping method can improve torque density, whilst reducing torque ripple.

A Study on the Cutting Conditions of Self-Induced Chattering in Micro Shaping with Diamond Tool (다이아몬드 미세형삭가공의 자려진동 발생경향에 관한 연구)

  • 임한석;이언주;김술용;안중환
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.3
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    • pp.141-149
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    • 1998
  • Diamond shaping is one of the machining strategies to make the optical micro-groove molds, and it is especially useful when the component is an assembly of the linear micro-groove array. A mirrorlike surface and an arbitrary crose-sectional curve can be easily made by the diamond tool. However, the cutting speed of shaping is relatively lower than that of the other cutting methods, and there exist an unstable cutting conditions that generate the chatter. This study is focused on the modeling of the simplified self-induced chatter of the diamond shaping, and the machinabilities of three materials are compared by cutting experiments. From the chatter model and experiments, it is found that the unstable cutting conditions exist when the depth of cut is low and cutting speed is high. It is also found that the brass is relatively good material in micro shaping than copper or aluminium from the cutting experiments.

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