• 제목, 요약, 키워드: Virtual primary core

검색결과 6건 처리시간 0.028초

Thrust Performance Improvement of a Linear Induction Motor

  • Lee, Hyung-Woo;Park, Chan-Bae;Lee, Byung-Song
    • Journal of Electrical Engineering and Technology
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    • v.6 no.1
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    • pp.81-85
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    • 2011
  • The end effect of a linear induction motor (LIM) has been known for several decades, especially in high speed operation. The exit part of the primary is not dealt as extensively as the entry part because of its minor effect. However, the exit part is one of the keys to weaken the dolphin effect, which occurs in high speed operation. In this paper, the concept of the virtual primary core is introduced, and chamfering of the primary outlet teeth is proposed to minimize the longitudinal end effect at the exit zone. For this, LIM for the high-speed train is designed and analyzed by using finite element method. Results confirm that chamfering can improve thrust performance effectively.

공간고조파법을 이용한 영구자석 선형 동기전동기의 슬롯을 고려한 정특성 해석 (Analysis of Static Characteristics of PMLSM Using Space Harmonic Analysis Considering Slot Structure)

  • 임기채;홍정표;김규탁
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • v.48 no.4
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    • pp.145-151
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    • 1999
  • This paper presents the characteristic analysis method of PMLSM based on the Space Harmonic Analysis method considering the effect of stator slots. The magnetic field for unslotted primary can be easily calculated by the conventional space harmonic analysis method and the resultant magnetic field including slot effect is obtained using the concept of the virtual Equivalent Magnetizing Current(EMC) on primary core. And the influence of space harmonics in airgap flux density and static thrust due to slots is evaluated. In this paper, the results of the analytical method are compared with not only the experimental ones but ones of FEM to verify the validity of the proposed method.

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가상현실 교육에서 학교 급별 교육과정의 특성에 대한 연구 (A Study on the Learner Characteristics in Virtual Reality by a School Level Curriculum)

  • 남충모;김종우;홍경선;조치노;홍주희
    • 정보교육학회논문지
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    • v.24 no.1
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    • pp.71-78
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    • 2020
  • 4차 산업혁명 시대의 교육방법과 함께 교육효과를 극대화하기 위한 방법으로 실감형 콘텐츠가 교육의 핵심방법으로 자리 잡고 있다. 그리고 실감형 콘텐츠의 중심에 가상현실(VR)이 자리 잡고 있다. 학교 현장에서 가상현실 활용 교육은 늘어나고 있지만, 가상현실 제작 교육에 관한 연구가 미비한 실정이다. 본 연구는 학생이 가상현실 콘텐츠를 직접 제작하는 과정을 위한 학교 급별 교육과정을 제시하였다. 초등학생, 중학생, 예비교사들의 특성의 분석을 위해 산출물과 설문지 분석을 하였다. 연구 결과로 학교 급별에 따라 집중도, 콘텐츠의 주제, 제작 시간 등은 많은 차이가 나타났으며, 초등학생은 자기와 관련된 주제, 중학생은 학습과 관련, 예비교사들은 초등 교육에 유용한 내용을 우선적으로 생각하였다.

평판 철심가동형 LOA의 특성해석 및 정특성 시험 (Characteristic Analysis and Static Tests of a Flat Moving Core Type LOA)

  • 장석명;정상섭;정종민;김형규;우종섭
    • 대한전기학회:학술대회논문집
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    • pp.52-54
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    • 1998
  • LOA is the linear electromechanical device that mover is similar to secondary conductor of LIM. The mover reciprocates along stroke by supplying the alternating current to primary coil. LOA is the simpler and more efficient than other linear apparatus using the rotary motor because LOA produce the thrust force without any mechanical converter such as cam, clutch, belt, rack and pinion, etc. This paper deals with the static characteristics of moving coil type LOA by virtual work method, FEM analysis and experiment Results show that thrust force increases when mover travels form center to both ends.

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Virtual Ground Based Augmentation System

  • Core, Giuseppe Del;Gaglione, Salvatore;Vultaggio, Mario;Pacifico, Armando
    • 한국항해항만학회:학술대회논문집
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    • v.2
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    • pp.33-37
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    • 2006
  • Since 1993, the civil aviation community through RTCA (Radio Technical Commission for Aeronautics) and the ICAO (International Civil Air Navigation Organization) have been working on the definition of GNSS augmentation systems that will provide improved levels of accuracy and integrity. These augmentation systems have been classified into three distinct groups: Aircraft Based Augmentation Systems (ABAS), Space Based Augmentation Systems (SBAS) and Ground Based Augmentation Systems (GBAS). The last one is an implemented system to support Air Navigation in CAT-I approaching operation. It consists of three primary subsystems: the GNSS Satellite subsystem that produces the ranging signals and navigation messages; the GBAS ground subsystem, which uses two or more GNSS receivers. It collects pseudo ranges for all GNSS satellites in view and computes and broadcasts differential corrections and integrity-related information; the Aircraft subsystem. Within the area of coverage of the ground station, aircraft subsystems may use the broadcast corrections to compute their own measurements in line with the differential principle. After selection of the desired FAS for the landing runway, the differentially corrected position is used to generate navigation guidance signals. Those are lateral and vertical deviations as well as distance to the threshold crossing point of the selected FAS and integrity flags. The Department of Applied Science in Naples has create for its study a virtual GBAS Ground station. Starting from three GPS double frequency receivers, we collect data of 24h measures session and in post processing we generate the GC (GBAS Correction). For this goal we use the software Pegasus V4.1 developed from EUROCONTROL. Generating the GC we have the possibility to study and monitor GBAS performance and integrity starting from a virtual functional architecture. The latter allows us to collect data without the necessity to found us authorization for the access to restricted area in airport where there is one GBAS installation.

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Pharmacophore Modeling, Virtual Screening and Molecular Docking Studies for Identification of New Inverse Agonists of Human Histamine H1 Receptor

  • Thangapandian, Sundarapandian;Krishnamoorthy, Navaneethakrishnan;John, Shalini;Sakkiah, Sugunadevi;Lazar, Prettina;Lee, Yu-No;Lee, Keun-Woo
    • Bulletin of the Korean Chemical Society
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    • v.31 no.1
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    • pp.52-58
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    • 2010
  • Human histamine H1 receptor (HHR1) is a G protein-coupled receptor and a primary target for antiallergic therapy. Here, the ligand-based three-dimensional pharmacophore models were built from a set of known HHR1 inverse agonists using HypoGen module of CATALYST software. All ten generated pharmacophore models consist of five essential features: hydrogen bond acceptor, ring aromatic, positive ionizable and two hydrophobic functions. Best model had a correlation coefficient of 0.854 for training set compounds and it was validated with an external test set with a high correlation value of 0.925. Using this model Maybridge database containing 60,000 compounds was screened for potential leads. A rigorous screening for drug-like compounds unveiled RH01692 and SPB00834, two novel molecules for HHR1 with good CATALYST fit and estimated activity values. The new lead molecules were docked into the active site of constructed HHR1 homology model based on recently crystallized squid rhodopsin as template. Both the hit compounds were found to have critical interactions with Glu177, Phe432 and other important amino acids. The interpretations of this study may effectively be deployed in designing of novel HHR1 inverse agonists.