• Title/Summary/Keyword: Position information

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Dynamic Supplier-Managed Inventory Control and the Beneficial Effect of Information Sharing (공급자 주도의 동적 재고 통제와 정보 공유의 수혜적 효과 분석에 대한 연구)

  • Kim Eun-gab;Park Chan-kwon;Shin Ki-tae
    • Journal of the Korean Operations Research and Management Science Society
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    • v.29 no.3
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    • pp.63-78
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    • 2004
  • This paper deals with a supplier-managed inventory(SMI) control for a two-echelon supply chain model with a service facility and a single supplier. The service facility is allocated to customers and provides a service using items of inventory that are purchased from the supplier, Assuming that the supplier knows the information of customer queue length as well as inventory position in the service facility at the time when it makes a replenishment decision, we identify an optimal replenishment policy which minimizes the total supply chain costs by reflecting these information into the replenishment decision. Numerical analysis demonstrates that the SMI strategy can be more cost-effective when the information of both customer queue length and inventory position is shared than when the information of inventory position only is shared.

A Study on Ontology-based Indoor Positioning Techniques using BLE Beacon (BLE Beacon을 이용한 온톨로지 기반의 실내 위치 지정 기법에 관한 연구)

  • Hwang, Chi-Gon;Yoon, Chang-Pyo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.05a
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    • pp.326-327
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    • 2016
  • A study on Ontology-based indoor positioning techniques using BLE Beacon. Recently BLE beacon has been widely used as a technique for measuring the indoor location. But it requires a filtering technique for the measurement of the correct position, and uses the most fixed beacon. It is not accurate that calculates the position information through the identification of the beacon signal. Therefore, filtering is important. So it takes a lot of time, position measurement and filtering. Thus, we is to measure the exact position at the indoor using a mobile beacon. The measured beacon signal is composed of an ontology for reuse in the same pattern. RSSI is measured the receiver is the distance of the beacon. And this value configure the location ontology to be normalized by the relationship analysis between the values. The ontology is a method for calculating the position information of the moving beacon. It may be detected fast and accurate indoor position information.

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A Low-Cost Portable Precise Position Information Service System Using the DGPS Mechanism (DGPS 개념을 이용한 저가형 이동식 정밀위치 서비스 시스템)

  • Yeoun Hyo-Bum;Kang Yeong-Wook;Lee Ki-Dong
    • The KIPS Transactions:PartC
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    • v.13C no.1 s.104
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    • pp.95-102
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    • 2006
  • Nowadays, GPS is used widely, especially in case which needs precise position information, such as car navigation systems and various kinds of position measuring instruments in an outdoor environment. According to their applications, there are many kinds of GPS receivers with different costs and error rates. The maximum error range of the general-purpose GPS receiver is within 30m, though the error rate depends on receiving rate of signal and weather condition. RTK(Real-Time Kinematic) and DGPS(Differential Global Positioning System) have more precise accuracy than the general-purpose GPS. However end users can't afford use them because of their high price and large size of equipments. In order for the end user to obtain precise position information, it is important that GPS receivers has portability and low price. In this study, we introduce a new system that offers precise position information using the DGPS mechanism satisfying low cost and portability.

Improving of Starting and Low Speed Performance of PMAC with Linear Encoder

  • Lee, Dong-Hee;Lee, Hwa-Seok;Park, Sung-Jun;Lee, Yang-Woo
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.99.4-99
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    • 2001
  • PMAC(Permanent magnet AC) motor drives are widely used in the industrial applications and home appliances because of high torque ratio, high efficiency and precise control performance. In recent years there has been a significant development of PMAC motors of various kinds. Improvements in the properties of permanent magnet materials have increased the viability of related types of motors. However, precise speed and position information is essential for the good control performance. In order to produce correct torque, the rotor flux position information from position sensor has to be identified. In this paper, a low cost position sensor is proposed for improving of starting and low speed performance of PMAC. The proposed position ...

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A Non-contact Two-Dimensional Position Sensing Device Using Electromagnetic Induction (전자기 유도 방식을 이용한 비접촉식 2차원 위치 센서)

  • Ryu, Young-Kee;Koh, Kuk-Won;Kim, Hak-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.11
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    • pp.1159-1163
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    • 2012
  • In this paper, we would like to introduce two dimensional non-contact position sensor by using an electromagnetic induction based coil system and an algorithm to estimate the position of pointer. The sensor which will introduce in this paper is composed of a pointer including LC resonant circuit and a sensor board to detect the electromagnetic signal from the pointer. Because of the simplicity shape of the line antenna, low cost and free form curved shape of the sensor device is possible. In this research, we proposed a new two dimensional non-contact type electromagnetic sensor system and realized the proposed sensor device. From the experiments, the proposed device can be employed for the two dimensional position sensor.

Implementation of Position Awareness System Using One-Pass Tag (원패스 태그를 이용한 위치인식 시스템 구현)

  • Sohn, Jong-Hoon;Hwang, Gi-Hyun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.301-303
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    • 2012
  • In this Paper, we are implemented position awareness system based on one-pass tag. This system are combined ZigBee and RFID technology. We developed the solution to detect of user's position using position awareness receiver and repeater. This location recognition includes parked car location tracking, coming in and out car, automation of immigration control, enhanced security through emergency call, and automatic invocation elevator control and etc.

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Adaptive Sliding Mode Observer for DC-Link Voltage Control of Switched Reluctance Generator without Position Sensor (적응 슬라이딩 모드 관측기를 이용한 Switched Reluctance Generator의 위치 센서 없는 구동에 관한 연구)

  • Choi, Yang-Kwang;Kim, Young-Seok;Kim, Young-Jo;Choi, Jung-Soo
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.179-182
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    • 2002
  • The position information of the rotor are required while the SRG(Switched Reluctance Generator) is drived. The position information is generally provided by shaft encoder or resolver. But it is weak in the dusty, high temperator and EMI environment. Therefore, the sensor is able to required to eliminated from the SRG. In this paper, a estimation algorithm for the rotor position of the SRG is introducted and a constant DC-link voltage is controled by PID controller. The estimation algorithm is implemened by the adaptive sliding observer and that it is able to estimate the rotor position well is proved by the simulation.

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Position estimation of mobile robot using modified kalman filter (변형된 칼만 필터를 이용한 이동 로봇의 위치 추정)

  • Kang, Seon-Ho;Jung, Kyung-Kwon;Lee, Yong-Gu;Eom, Ki-Hwan
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.1005-1006
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    • 2006
  • This paper proposes a method of position estimating through compensating the autonomous mobile robot's noise. Proposed method is that estimated position error by modified Kalman filter method using neural network. We use a neural network for measurement noise covariance and system noise covariance. In order to verify the effectiveness of the proposed method, we performed experiments for position estimation. The results show that convergence and position error is reduced than the Kalman filter method.

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Rapid Asynchronous UWB Position Location Scheme (고속 비동기식 UWB 무선측위 기법)

  • NamGoong, Young;Yang, Suck-Chel;Kang, Dong-Woo;Shin, Yoan
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.41-42
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    • 2006
  • In this paper, we propose a rapid asynchronous UWB (Ultra Wide Band) position location scheme based on double RTTs (Round-Trip Transmissions). In the proposed scheme, to avoid performance degradation of the position location in harsh multipath channel environments where LoS (Line-of-Sight) components are not always guaranteed, the remaining RTT information is solved from realistic double RTTs. Simulation results in IEEE 802.15.4a UWB channel models reveal that the proposed scheme can achieve closely comparable position location accuracy of the conventional ToA (Time of Arrival) method based on triple RTTs, while reducing the processing delay required for the calculation of the position locations.

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Development of GPS Simulation Tool Kit for Personal Computer (PC를 이용한 GPS Simulation System 개발)

  • 양원재;전승환;박계각
    • Journal of the Korean Institute of Navigation
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    • v.24 no.4
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    • pp.219-226
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    • 2000
  • Ship's position data obtaining method is one of the very important factor in navigation. Nowadays, GPS(Global Positioning System) using the earth orbiting satellites are equipped and operated for the position finding. Because it provides more precise position information than other equipments and is very convenient for navigator. In this study, it is designed to develop the GPS simulator for everybody being able to practise the GPS operating skill like as navigation planning, navigation calculating etc. And also, it can be operated with personal computer without real GPS receiver. This simulation system is based on the real GPS receiver and built by the visual basic 5.0 program. And it displays the ship's position and navigating information and plots the ship's moving track on the screen in real time according as initial setup data-main engine's rpm, rudder angle, departure position and waypoint.

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