• Title/Summary/Keyword: Moving part

Search Result 886, Processing Time 0.027 seconds

The Study of Strategies for acquisition of moving object location

  • Min, Kyoung-Wook;Jang, In-Seung;Park, Jong-Hyun
    • Proceedings of the KSRS Conference
    • /
    • 2002.10a
    • /
    • pp.111-116
    • /
    • 2002
  • The types of service using location Information are being various and extending it's domain as wireless internet technology is developing and it's application part is widespread, so it is prospected that LBS (Location-Based Services) will be killer application in wireless internet services. This location information is basic and high value-added information, and this information services make prior GIS (Geography Information System) to be useful to anybody. The acquisition of this location information from moving object is very important part for these LBS. After this, when LBS is familiar to everybody, we can predict that LBS system load is so heavy for the acquisition of so many subscribers and vehicles. Moving object database (MODB) system manages objects like subscribes and vehicles that are moving and have telecommunication terminal checked one's location. MODB is consists of 4 part, moving object location acquisition part, moving object location storage part, moving object query processing part, and moving object application p art. In this MODB system, acquisition of moving object location part must provide guarantee location information as well as reduce telecommunication overhead. In this paper, we study of problems in acquisition a huge number o f moving objects location and design some acquisition strategies to reduce telecommunication overhead. And after implementation these strategies, we estimate performance of this system and quality of information.

  • PDF

Stability Analyses of Magnetic Levitation Tables Using Repulsions of Permanent Magnets (영구자석에 의한 반발형 자기부상 테이블의 안정성 해석)

  • Choe, Gi-Bong;Jo, Yeong-Geun;Tadahiko Shinshi;Akira Shimokohbe
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.19 no.7
    • /
    • pp.36-42
    • /
    • 2002
  • This paper presents two actuators for levitation using repulsions of permanent magnet and two magnetic levitation tables using the actuators. Here, one actuator for levitation consists of one fixed magnet and one moving magnet, and the other actuator consists of two fixed magnets and one moving magnet. The moving part of the magnetic levitation table contains the moving magnets. repulsive forces caused by the permanent magnets are linearized, and then the equation of motion of the moving part of the table is derived. Using the equation of motion, stability conditions of the moving part are deduced. The stability conditions are analyzed for positional relations of the moving magnets and the minimum number of active control required for stable system. As a result, in the each case of magnetic levitation tables, the requirements for stabilization are expressed by the positional relations and the number of the active controls.

A clinical study of the affected part acupuncture moving treatment on the acute radial nerve palsy patient who has Cervical Herniation (환측 동기침법을 이용한 경추 추간판 탈출증 환자의 급성 압박성 요골신경마비 치험 1례)

  • Jeong, Hoon;Cho, Nam-Hoon;Park, Ji-Yong;Park, Hyun-Min;Bae, Sang-Eun;Hong, Nam-Jung
    • Journal of the Korean Institute of Oriental Medical Informatics
    • /
    • v.17 no.2
    • /
    • pp.73-81
    • /
    • 2011
  • Objectives : The purpose of this study is to evaluate the affected part acupuncture moving treatment for acute radial nerve palsy patient who has Cervical Herniation. Methods : We examined 1 patient with Radial nerve palsy who admitted Jaseng Hospital of Oriental Medicine. The patient was treated by the affected part acupuncture moving treatment including herbal mixture. Results : In this study, in the end of affected part acupuncture moving treatment, patient's condition has improved. Muscle strength was also increased. Conclusions : The affected part acupuncture moving treatment for acute radial nerve palsy was effective in restore of functional activities, but this treatment needs more study.

  • PDF

A Study on Optimization of Block Sectioning for Step Speed Control (II) (다단계 속도제어에 의한 폐색구간 분할에 대한 최적화에 관한 연구 (II))

  • 이종우
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.52 no.8
    • /
    • pp.397-404
    • /
    • 2003
  • In part I, we studied only step speed control for train, the second part extended to beacon signaling system and moving block system. With the calculated braking distance in part I, part II showed how to reduce headway using the beacon signaling system and moving block system, revealed that the beacon system has a braking distance advantage for sighting allowance with compared to step speed control, proposed beacon installation interval and revealed the braking distance with moving block system being nearly approached to train pure braking distance. We compared three different train control system to decide the best signaling system for a given condition and obtained the result that three systems have a same headway near 10~13 steps speed control.

Vibration Analysis of Super-Precision Linear Motors (초정밀 선형 모터의 진동 분석)

  • Seol, Jin-Soo;Lee, Woo-Young;Rim, Kyung-Hwa
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2004.11a
    • /
    • pp.840-845
    • /
    • 2004
  • Development of the linear motors is recently required to control a high-speed and high-resolution in the high-integrated and speed process industry. This paper presents vibration analyses as well as measurement standards of the newly developed linear motors through analyzing the vibration characteristics of the advanced products. Vibration experiments are conducted for identifying vibration level during operation. They are also included in the modal test to analyze dynamic characteristics. Analytic data using Finite Element Method (FEM) are compared with the results of the modal. The FEM and experiments make it possible to understand these characteristics. Further, through computer simulation for the behavior of moving part to be vibration source, the best acceleration pattern of moving part movement can be verified to achieve effective moving part positioning and reduce the vibration due to moving part movement.

  • PDF

Design of Runner System and Prediction of Moving Distance of the Screw for the Improvement of Formability of a Housing Part of Small-Size Air Cleaner (소형 공기청정기 하우징의 성형성 향상을 위한 런너시스템 설계 및 스크류 전진 거리 예측)

  • Kim, Dong-In;Lee, Ho-Jin;Ahn, Dong-Gyu
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.33 no.12
    • /
    • pp.1021-1030
    • /
    • 2016
  • The runner system of the injection mould and the injection volume of the injection molding process greatly affect the quality of the produced part. The goal of this paper is the design of the runner system and the prediction of the injection volume for the injection moulding of a housing part of small-size air cleaner to improve the formability through the three-dimensional injection moulding analysis. The effects of the runner system of the mould on the injection moulding characteristics are investigated. From the results of the investigation, a proper design of the runner system with uniform filling characteristics and the minimized defect formation is obtained. In addition, the influence of the moving distance of the screw on filling characteristics, weldline formation and deformation characteristics is examined. From the results of the examination, an appropriate moving distance of the screw for the housing part of small-size air cleaner is estimated.

Dynamics of a bridge beam under a stream of moving elements -Part 2 - Numerical simulations

  • Podworna, M.
    • Structural Engineering and Mechanics
    • /
    • v.38 no.3
    • /
    • pp.301-314
    • /
    • 2011
  • The paper constitutes the second part of the author's study. The first part (Podworna 2010) formulates four fundamental tasks in dynamics of the bridge-track-train systems. The following cyclic moving loads are considered: a concentrated forces stream (model P), an unsprung masses stream (model M), a single-mass viscoelastic oscillators stream (model $M_o$) and a double-mass viscoelastic oscillators stream (model $MM_o$). Three problems precluding to the numerical simulations have been developed, i.e., prediction of the forced resonances, the parameters of integration of equations of motion, the output results. A computer programme was written in Pascal and numerical research in the scope of the fundamental tasks was worked out. The investigations were focused on adequacy evaluation of the moving load models, P, M, $M_o$, $MM_o$, in predicting dynamic processes in railway bridges.

Dynamic characteristics of optical pickup actuator with a newly designed electromagnetic circuit (신 자기회로가 적용된 광픽업 액추에이터의 동특성)

  • Park, Kwan-Woo;Kim, Jae-Eun;Jung, Jae-Hyun;Lee, Kyung-Taek;Ko, Eui-Seok;Hoon, Min-Byung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2008.11a
    • /
    • pp.512-514
    • /
    • 2008
  • In this paper, a new electromagnetic circuit is proposed for an optical pickup actuator with high sensitivity. Contrary to those of conventional actuators, the proposed circuit has two focusing coils which are diagonally placed at the front and rear of a moving part. The configuration which makes the effective length of the focusing coil longer and the moving part lighter, is helpful in increasing the sensitivity of the actuator. However, the asymmetry of the moving part by two focusing coils causes flexible node vibrations in quite low frequency range. This paper shows that the design modification of the moving part for the reconfiguration of mass moment of inertia can reduce the mode vibrations.

  • PDF

A Study on Pressure Characteristic in Various Inner Structure of Valves (밸브 운동부 구조 변화에 따른 압력특성에 관한 연구)

  • Hur, J.G.;Oh, I.H.;Yang, K.U.
    • Journal of Power System Engineering
    • /
    • v.14 no.3
    • /
    • pp.77-82
    • /
    • 2010
  • In general, the control valves are essential components in hydraulic systems. Structural changes within the valves remain a challenge because many parameters of valve tend to interact in terms of static and dynamic performance. Therefore, the valve characteristics is applied directly to the stability of hydraulic system. Inner structure of the valve which is used mainly in the industries is made up poppet type and spool type. This paper made a description of the method for numerical analysis and modeling of the valve with a built-in moving part of four-type. Based on the physical parameters of the valves, a numerical model of objected valve is developed using the bond graph method. It is to verified the results that the moving part of four-type has an effect on pressure and flow characteristics. Also, It is analyzed the results which has an effect on response characteristic by angular of poppet valve face and inertia variation of the valve with a built-in moving part. In the results, it is confirmed that the rising and settling time vary with the shape of moving part in valve.

The Design of Alert Engine Cartridge On Moving Object Database

  • Min, Kyoung-Wook;Park, Jong-Hyun
    • Proceedings of the KSRS Conference
    • /
    • 2003.11a
    • /
    • pp.189-191
    • /
    • 2003
  • The types of service using location information are being various and extending its domain as wireless internet technology is developing and its application part is widespread, so it is prospected that LBS (Location-Based Services) will be killer application in wireless internet services. The MODB (Moving Object Database) stores and manages very large current/ past moving object data, so it is very important part in LBS platform. The performance of LBS platform is tightly depending on the performance of this MODB. The other important part is alerting engine in LBS platform, which is system to transmit various value-added information or notify emergency information to mobile phone after triggering specified events. This alert engine is supported as extended function of MODB, that is to say, the alerting function is closely related with MODB. So alert cartridge on MODB must provide not only moving point triggering about going into, going out specified geographical area but also batch alerting about nearest neighbor from specified geographical area. In this paper, we study of extended part on MODB to support the alert engine. And we design alert engine cartridge on MODB before implementing the system.

  • PDF