• Title/Summary/Keyword: locating

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Design and implementation of low-power tracking device based on IEEE 802.11 (IEEE 802.11 기반 저전력 위치 추적 장치의 설계 및 구현)

  • Son, Sanghyun;Kim, Taewook;Baek, Yunju
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.2
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    • pp.466-474
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    • 2014
  • According to wireless network technology and mobile processors performance were improved, the small wireless mobile device such as smart phones has been widely utilized. The mobile devices can be used GPS information, thereby the services based on location information was increased. GPS was impossible to provide location information in indoor and signal shading environment, and the tracking systems based on short distance wireless communication are required infrastructure. The IEEE 802.11 based tracking system is possible estimation using APs, however the tracking device is exhausted battery power seriously. In this paper, we propose IEEE 802.11 based low-power tracking system. We reduced power consumption from channel scanning and network connection. For performance evaluation, we designed and implemented the tracking tag device, and measured power consumption of the device. As the simulation result, we confirmed that the power consumption was reduced 46% compare to the standard execution.

Design and Implementation of an SCI-Based Network Cache Coherent NUMA System for High-Performance PC Clustering (고성능 PC 클러스터 링을 위한 SCI 기반 Network Cache Coherent NUMA 시스템의 설계 및 구현)

  • Oh Soo-Cheol;Chung Sang-Hwa
    • Journal of KIISE:Computer Systems and Theory
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    • v.31 no.12
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    • pp.716-725
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    • 2004
  • It is extremely important to minimize network access time in constructing a high-performance PC cluster system. For PC cluster systems, it is possible to reduce network access time by maintaining network cache in each cluster node. This paper presents a Network Cache Coherent NUMA (NCC-NUMA) system to utilize network cache by locating shared memory on the PCI bus, and the NCC-NUMA card which is core module of the NCC-NUMA system is developed. The NCC-NUMA card is directly plugged into the PCI slot of each node, and contains shared memory, network cache, shared memory control module and network control module. The network cache is maintained for the shared memory on the PCI bus of cluster nodes. The coherency mechanism between the network cache and the shared memory is based on the IEEE SCI standard. According to the SPLASH-2 benchmark experiments, the NCC-NUMA system showed improvements of 56% compared with an SCI-based cluster without network cache.

Development of Secure Entrance System using AOP and Design Pattern (관점지향 소프트웨어 개발 방법론과 디자인 패턴을 적용한 출입 보안 시스템 개발)

  • Kim, Tae-Ho;Cheon, Hyeon-Jae;Lee, Hong-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.3
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    • pp.943-950
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    • 2010
  • A secure entrance system is complicated because it should have various functions like monitoring, logging, tracing, authentication, authorization, staff locating, managing staff enter-and-leave, and gate control. In this paper, we built and applied a secure entrance system for a domestic nuclear plant using Aspect Oriented Programming(AOP) and design pattern. Using AOP has an advantage of clearly distinguishing the role for each functional module because building a system separated independently from the system's business logic and security logic is possible. It can manage system alternation flexibility by frequent change of external environment, building a more flexible system based on increased code reuse, efficient functioning is possible which is an original advantage of AOP. Using design pattern enables to design by structuring the complicated problems that arise in general software development. Therefore, the safety of the system can also be guaranteed.

A Global Self-Position Localization in Wide Environments Using Gradual RANSAC Method (점진적 RANSAC 방법을 이용한 넓은 환경에서의 대역적 자기 위치 추정)

  • Jung, Nam-Chae
    • Journal of the Institute of Convergence Signal Processing
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    • v.11 no.4
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    • pp.345-353
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    • 2010
  • A general solution in global self-position location of robot is to generate multiple hypothesis in self-position of robot, which is to look for the most positive self-position by evaluating each hypothesis based on features of observed landmark. Markov Localization(ML) or Monte Carlo Localization(MCL) to be the existing typical method is to evaluate all pairs of landmark features and generated hypotheses, it can be said to be an optimal method in sufficiently calculating resources. But calculating quantities was proportional to the number of pairs to evaluate in general, so calculating quantities was piled up in wide environments in the presence of multiple pairs if using these methods. First of all, the positive and promising pairs is located and evaluated to solve this problem in this paper, and the newly locating method to make effective use of calculating time is proposed. As the basic method, it is used both RANSAC(RANdom SAmple Consensus) algorithm and preemption scheme to be efficiency method of RANSAC algorithm. The calculating quantity on each observation of robot can be suppressed below a certain values in the proposed method, and the high location performance can be determined by an experimental on verification.

In vivo assessment of accuracy of Propex II, Root ZX II, and radiographic measurements for location of the major foramen

  • Tampelini, Fernanda Garcia;Coelho, Marcelo Santos;de Azevedo Rios, Marcos;Fontana, Carlos Eduardo;Rocha, Daniel Guimaraes Pedro;Pinheiro, Sergio Luiz;da Silveira Bueno, Carlos Eduardo
    • Restorative Dentistry and Endodontics
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    • v.42 no.3
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    • pp.200-205
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    • 2017
  • Objectives: The aim of this in vivo study was to assess the accuracy of 2 third-generation electronic apex locators (EALs), Propex II (Dentsply Maillefer) and Root ZX II (J. Morita), and radiographic technique for locating the major foramen (MF). Materials and Methods: Thirty-two premolars with single canals that required extraction were included. Following anesthesia, access, and initial canal preparation with size 10 and 15 K-flex files and SX and S1 rotary ProTaper files, the canals were irrigated with 2.5% sodium hypochlorite. The length of the root canal was verified 3 times for each tooth using the 2 apex locators and once using the radiographic technique. Teeth were extracted and the actual WL was determined using size 15 K-files under a ${\times}25$ magnification. The Biostat 4.0 program (AnalystSoft Inc.) was used for comparing the direct measurements with those obtained using radiographic technique and the apex locators. Pearson's correlation analysis and analysis of variance (ANOVA) were used for statistical analyses. Results: The measurements obtained using the visual method exhibited the strongest correlation with Root ZX II (r = 0.94), followed by Propex II (r = 0.90) and Ingle's technique (r = 0.81; p < 0.001). Descriptive statistics using ANOVA (Tukey's post hoc test) revealed significant differences between the radiographic measurements and both EALs measurements (p < 0.05). Conclusions: Both EALs presented similar accuracy that was higher than that of the radiographic measurements obtained with Ingle's technique. Our results suggest that the use of these EALs for MF location is more accurate than the use of radiographic measurements.

Library Management and Services for Software Component Reuse on the Web (Web 소프트웨어 컴포넌트 재사용을 위한 라이브러리 관리와 서비스)

  • Lee, Sung-Koo
    • Journal of KIISE:Software and Applications
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    • v.29 no.1_2
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    • pp.10-19
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    • 2002
  • In searching and locating a collection of components on the Web, users require a Web browser. Since the Web libraries tend to grow rapidly, there needs to be an effective way to organize and manage such large libraries. Traditional Web-based library(retrieval) systems provide various classification scheme and retrieval services to store and retrieve components. However, these systems do not include invaluable services, for example, enabling users to grasp the overall contents of the library at the beginning of retrieval. This paper discusses a Web-based library system, which provides the efficient management of object-oriented components and a set of services beyond simple component store and retrieval. These services consist of component comprehension through a reverse engineering process, automated summary extraction, and comprehension-based retrieval. Also, The performance of an automated cluster-based classification scheme adopted on the system is evaluated and compared with the cluster-based classification scheme adopted on the system is evaluated and compared with the performance of two other systems using traditional classification scheme.

Architecture and Path-Finding Behavior of An Intelligent Agent Deploying within 3D Virtual Environment (3차원 가상환경에서 동작하는 지능형 에이전트의 구조와 경로 찾기 행위)

  • Kim, In-Cheol;Lee, Jae-Ho
    • The KIPS Transactions:PartB
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    • v.10B no.1
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    • pp.1-12
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    • 2003
  • In this paper, we Introduce the Unreal Tournament (UT) game and the Gamebots system. The former it a well-known 3D first-person action game and the latter is an intelligent agent research testbed based on UT And then we explain the design and implementation of KGBot, which is an intelligent non-player character deploying effectively within the 3D virtual environment provided by UT and the Gamebots system. KGBot is a bot client within the Gamebots System. KGBot accomplishes its own task to find out and dominate several domination points pro-located on the complex surface map of 3D virtual environment KGBot adopts UM-PRS as its control engine, which is a general BDI agent architecture. KGBot contains a hierarchical knowledge base representing its complex behaviors in multiple layers. In this paper, we explain details of KGBot's Intelligent behaviors, tuck af locating the hidden domination points by exploring the unknown world effectively. constructing a path map by collecting the waypoints and paths distributed over the world, and finding an optimal path to certain destination based on this path graph. Finally we analyze the performance of KGBot exploring strategy and control engine through some experiments on different 3D maps.

Analyzing the Location Decision of the Large-Scale Discount Store Using the Spatial Association Rules Mining (공간 연관규칙을 이용한 대형할인점의 입지 분석)

  • Lee Yong-Ik;Hong Sung-Eon;Kim Jung-Yup;Park Soo-Hong
    • Journal of the Korean Geographical Society
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    • v.41 no.3 s.114
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    • pp.319-330
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    • 2006
  • The objective of this research is to achieve an objectivity of site decision after extracting site decision factors on a large-scale discount store(LSDS) and utilize any hidden information using the association rules mining through huge database. To catch this objective, we collect a census, economic, and environmental dataset related with locating of LSDS. And then, we construct a spatial data on the research area. These data is used for the extraction of a spatial association rules. To verify whether the extracted rules are suitability or not, we use the sales of some LSDS. As the result of test, the more sales, the more factors of the extracted rules relate with the sales it coincides. Consequently, the spatial association rules mining is efficient method which support the ideal site decision of LSDS.

Numerical Analysis on Flow Characteristics in the Pressurized Air Supply Smoke Control System (급기가압 제연설비의 내부 유동특성에 대한 수치해석)

  • Ko, Gwon-Hyun
    • Fire Science and Engineering
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    • v.31 no.4
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    • pp.52-58
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    • 2017
  • This study investigated the pressure difference distribution and the flow characteristics among room, ancillary room, and stair case by carrying out the numerical simulations on the air flow inside the pressurized air supply smoke control system. Numerical simulations were conducted to analyze pressure and velocity distribution of compartments by pressurized air supply for the air-leakage test facility which was built to measure the effective leakage area. In this study, the leakage of air was considered by locating the narrow slit onto fire door and window of room. Simulated results using this method precisely followed the previous experimental results for the pressure differences between the stair case and ancillary room. Predicted results showed that the local leakage of air rarely affected the overall flow pattern and pressure distribution. Although the average velocity over the door between room and ancillary room satisfied the regulation for fire safety, it was certified the unsafe outflow to ancillary room could be occurred in the local position such as the upper part of the door.

Design and Implementation of a Request and Response Process on Help-Requesting Mobile Application (모바일 도움요청 어플리케이션에서의 요청 및 상호 대응 프로세스 설계)

  • An, Sung-Eun;Lim, Soon-Bum;Kim, Min-Jeong;You, Soo-Yeon
    • KIISE Transactions on Computing Practices
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    • v.21 no.4
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    • pp.320-326
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    • 2015
  • With the growing concern over frequent occurrences of criminal events, help-requesting mobile applications have drawn attention. However, existing applications solely focus on providing help-requesting services. Therefore, in this paper, we design and implement a help request and response process which allows users to request help by sending messages and locating their friends, acquaintances and even near-by application users, and to allow help be reached by forwarding messages. This application is composed of three parts: help-requesting, help-responding, and checking-status. This application is developed on the Android platform where we exchange users' longitude and latitude through web server communication. We conducted test to verify the effectiveness of the forwarding function, and it has been confirmed that 93.33% of subjects used the forwarding function to help users at risk.