• Title, Summary, Keyword: RDC

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A study on one-chip DSP BLDC motor control using software RDC (Software RDC를 이용한 One-chip DSP BLDC Motor 제어에 관한 연구)

  • 김용재;조정목;권경엽;조중선
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1406-1409
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    • 2004
  • The Resolver usually used in industry is the absolute angle analog sensor that must be in order to driving BLDC (brushless DC) motor, and it needs RDC(Resolver-to-Digital converter) for changing the output signal to digital to be applied to the SVPWM(Space Vector Pulse Width Modulation) algorithm. Commonly used S/W RDC needs trigonometric function. What it takes a lot of calculation time of processor is gotten at weak point. In this paper, S/W RDC is realized except trigonometric functions as a result of feedback resolver outputs after filtering using FIR filter. thus, processing time is reduced. So, One-chip DSP Controller operating the Vector Control, RDC, and SVPWM can be designed.

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Torque Controlling Technic of PMSM not using RDC (RDC를 사용하지 않는 PMSM의 토크제어 기법)

  • Seo, An-Sik;Lee, Jun-Yeong
    • Proceedings of the KIPE Conference
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    • pp.113-114
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    • 2012
  • 영구자석 동기전동기(PMSM)를 제어 하기 위해서는 정확한 회전자 위치 검출장치가 필요하다. 일반적으로 위치 검출을 위한 장치로는 엔코더와 레졸버가 사용된다. 정확한 회전자의 위치를 검출하기 위해서는 엔코더보다 레졸버를 사용하게 되는데 레졸버를 사용하기 위해서는 RDC(Resolver-to-Digital Converter)가 필요하게 된다. 본 논문에서는 RDC회로를 사용하지 않고 회전자의 위치 검출을 위한 인터페이스를 구상하였고 RDC회로를 사용하지 않아도 동일 한 성능을 보인다는 것을 실험을 통하여 검증하였다.

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Cephalometric Characteristics of TMD Patients based on RDC/TMD Axis I Diagnosis (RDC/TMD Axis I 진단에 따른 측두하악장애 환자의 측두 두부방사선적 특징에 관한 연구)

  • Ahn, Ji-Yeon;Kim, Yong-Woo;Kim, Young-Ku;Lee, Jeong-Yun
    • Journal of Oral Medicine and Pain
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    • v.36 no.1
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    • pp.39-51
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    • 2011
  • The aims of this study were to investigate whether the facial skeletal patterns previously reported to be related to temporomandibular disorder (TMD) in other studies could be consistently observed in the TMD patients diagnosed according to Research Diagnostic Criteria for Temporomandibular Disorder (RDC/TMD) Axis I and evaluate its usability in the orthodontic clinics to examine the patients with TMD related symptoms. The clinical records and radiographs of female patients who visited the TMD and Orofacial Pain Clinic of Seoul National University Dental Hospital and were diagnosed as TMD were consecutively filed for this study. Patients were clinically examined and diagnosed according to the revised diagnostic algorithms of RDC/TMD Axis I and the lateral cephalogram, panoramic orthopantomogram, temporomandibular joint (TMJ) orthopantomogram, and transcranial radiograph of each patient were taken and digitalized. The data of patients who were under 18 years of age or had any systemic disease, trauma history involving the TMJ, or skeletal deformity at the time of the first examination were excluded. The remaining data of 96 female patients were finally analyzed. The obtained results were as follows: 1. There are no significant differences of cephalometric measurements between RDC I (muscle disorders) diagnostic groups. 2. Only the articular angle of the RDC group IIc (disk displacement without reduction without limited opening) patients was larger than patients of the no diagnosis of RDC II group (disk displacement). 3. Larger articular angle and smaller facial height ratio were observed in RDC IIIc group (osteoarthrosis) compared to IIIa group (arthralgia). Larger articular angle, larger Bjork sum, smaller posterior facial height, and smaller facial height ratio were observed in RDC group IIIc compared to no diagnosis of RDC III group (arthralgia, arthritis, and arthrosis). 4. According to the results of cephalometric analysis in simplified RDC groups, smaller overjet was observed in muscle disorders (MD) group. Facial height ratio and IMPA were smaller and articular angle was larger in disk displacements (DD) group than in no diagnosis of DD group. In arthrosis (AR) group, posterior facial height, and facial height ratio were smaller, and articular angle, gonial angle, facial convexity, FMA, Bjork sum, and ANB were larger than in no diagnosis of AR group. In joint pain (JP) group, only posterior facial height was smaller than no diagnosis of JP group. In conclusion, Facial morphologic patterns showing posterior-rotated mandible and lower posterior facial height is related to RDC group II and III diagnosis of the TMJ in female TMD patients. RDC/TMD Axis I diagnosis can provide a good clinical diagnostic tool for the standardized examination of the TMJ in orthodontic clinics.

Fatigue Behavior of Reinforced Dual Concrete Beam (철근 이중 콘크리트 보의 피로 거동)

  • Park, Tae-Hyo;Lee, Sang-Hee
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.37-40
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    • 2005
  • Reinforced dual concrete beam (RDC beam) is the reformed system that improves the overall structural properties of beam by partially applying high performance steel fiber reinforced concrete (HPSFRC) in the lower tension part of conventional reinforced concrete beam (RC beam). Fatigue test was done to prove the structural superiority of RDC beam. As a result of fatigue test, the deflection of RDC beam was decreased obviously and the slope of number of cycle-deflection relation curve of RDC beam was increased gently in comparison with RC beam.

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Enhancing the Accuracy for the Open-loop Resolver to Digital Converters

  • Karabeyli, Fikret Anil;Alkar, Ali Ziya
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.192-200
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    • 2018
  • In this study, improvements for error correction, speed, position, and rotation calculation algorithms have been proposed to be used in resolver to digital conversion (RDC) systems. The proposed open-loop system drives the resolver and uses the output signals of the resolver signal to estimate the real time position, the instant speed, and the rotation count with high resolution and accuracy even at high speeds and noise. The proposed solution implements strong features of both closed and open loop based systems while eliminating their weak points. The improvements proposed is resistant to noise owing to digital FIR filter and data averaging techniques. The implementation used for proof of concept is implemented on a hardware using an FPGA and configurable to be used by any resolver.

The Integrated Development Tool(RDC:Robot Design Center) for Personal Robot (퍼스널 로봇을 위한 통합 개발 환경(RDC)의 개발)

  • Kim, Joo-Min;Kim, Hong-Ryeol;Kim, Dae-Won;Yang, Kwang-Woong;Kim, Hong-Seok;Lee, Hog-Il
    • Proceedings of the KIEE Conference
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    • pp.2365-2367
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    • 2003
  • In this paper, we propose the RDC(Robot Design Center) for a network-based personal robot system. The RDC is developed under the new software framework for personal robots. The configuration for each modules in robot and functions of the RDC are described. The concept of standardized and modular program is presented and finally, developing procedures are proposed.

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A Study on the Reconstruction of Multi-Echelon Distribution System by the Customer Demand Decomposition of Regional Distribution Center (지역분배센터의 고객수요분할을 통한 다단계 분배체계 재구축에 관한 연구)

  • 최진영
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.20 no.44
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    • pp.61-68
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    • 1997
  • The algorithm of customer demand decomposition suggested by this study is a reconstruction method of distribution network under the allowance of same level supply. Regional distribution center(RDC) distributes additional inventories of some of the supplying items to retailers under its charge to reduce the time needed for emergency delivery to neighborhood retailer where backlog happened. This also restrict the purpose of the inventories held by RDC as only regular supply. All of which leads to the creation of more realistic method allowing the affiliation of closing related RDC with one in the vicinity. In this study, the role of RDC is restricted only as supplying items regularity and the conruction of distribution system processing through the closing by consideration of the possibility of supplying retailers from the RDC in the vicinity is discussed.

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A Study on the Reeducation of Design Specialists by the Construction of Daejeon Regional Design Center (대전 지역디자인센터(RDC)건립에 따른 디자인 전문인력 재교육 연구)

  • Kim, Jeong-A;Noh, Hwang-Woo
    • The Journal of the Korea Contents Association
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    • v.19 no.11
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    • pp.451-461
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    • 2019
  • Daejeon metropolitan city is rich with opportunity factors for the growth of the design industry in the 4th Industrial Revolution and aims at completing the '4th Industrial Revolution Special City'. As design is located at the center of convergence and the concept of design is closely related to the industrial structure, its importance is being emphasized in the 4th Industrial Revolution. Meanwhile, there was a limit to the development of the design industry in Daejeon metropolitan city due to the absence of the Regional Design Center(RDC), but Daejeon started constructing the Daejeon design center in June 2018 and aims to complete the construction by the end of 2019. This study analyzed and compared the 2018 Design Specialists Reeducation of KIDP and each RDC with the present conditions of industrial structure, design industry and reeducation of Daejeon to derive and suggest the plan of reeducation by the establishment of Daejeon Regional Design Center(RDC).

Implementation of the Radiation Protection Module for Electronic Equipment from Pulsed Radiation and Its Function Tests (펄스방사선에 대한 전자장비 방호용 모듈구현 및 기능시험)

  • Lee, Nam-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.10
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    • pp.1421-1424
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    • 2013
  • The electronic equipment which is exposed to high level pulsed radiation is damaged by Upset, Latchup, and Burnout. Those damages come from the instantaneous photocurrent from electron-hole pairs generated in itself. Such damages appear as losses of a power in military weapon system or as a blackout in aerospace equipment and eventually caused in gross loss of national power. In this paper, we have implemented a RDC(Radiation detection and control module) as a part of the radiation protection technology of the electronic equipment or devices from the pulsed gamma radiation. The RDC, which is composed of pulsed gamma-ray detection sensor, signal processors, and pulse generator, is designed to protect the an important electronic circuits from the a pulse radiation. To verify the functionality of the RDC, LM118s, which had damaged by the pulse radiation, were tested. The test results showed that the test sample applied with the RDC was worked well in spite of the irradiation of a pulse radiation. Through the experiments we could confirm that the radiation protection technology implemented with the RDC had the functionality of radiation protection for the electronic devices.