• Title/Summary/Keyword: Mobile Server

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An Efficient Scanning Group and Order Decision Method Using Neighbor Network Information in Wireless LAN (WLAN에서 이웃 네트워크 정보를 이용한 효율적인 스캐닝 그룹 및 순서 결정 방법)

  • Kang, Dong-Wan;Choi, Jae-Kark;Yoo, Sang-Jo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.2A
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    • pp.142-152
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    • 2010
  • When a mobile station(MS) performs a handover, in the IEEE 802.11 WLAN, MS's channel scanning for discovering new available APs is the dominating factor in handover latency, accounting 90% of overall latency. In order to reduce such a scanning latency, we focus on the method for reducing the number of channels for the MS in handover process to scan. With the help of IEEE 802.21 information server(IS), a proper order of groups of channels to be scanned is offered by the current AP depending on the information of neighbor APs in terms of the distance from serving AP, traffic load and network topology. By using this scanning order, the passive scanning of a MS in normal operation enables the MS to filter out the unavailable channels, and thus to classify the candidate channels of neighbor APs into three groups. Then, a handover-imminent MS can perform the active scanning from the most reliable group of channels. Simulation results show that the proposed scanning scheme reduce the scanning latency in comparison with the conventional scheme.

Realtime Image Transmission System based-on the Zigbee Protocol (지그비기반의 실시간 이미지전송시스템의 설계 및 구현)

  • Park, Byoung-Seob
    • Journal of the Korea Society of Computer and Information
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    • v.15 no.2
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    • pp.91-98
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    • 2010
  • In order to control moving facilities on a remote place effectively, it are required to acquire a environment informations such as images where the moving facilities are placed. However, since there is no tools to acquire such informations to the central control system based on the non-networked sensor environments, it is difficult to control the moving facilities remotely. Therefore, we design and implement the Zigbee based image transmission system and communication protocol to control the moving target remotely. The wireless control utilizing the Zigbee protocol is that electrically consumption is more small than the Bluetooth and reliability of data transmission is better. The implemented Zigbee based control systems and communication protocol have the normal and replay function for a realtime control of the moving target under the server PC and the mobile FDA with the WiFi protocol. The functional operability and performance are analyzed by a designed prototype under the wireless home network environment.

Measuring and Improving Method the Performance of E-Commerce Websites (전자상거래 웹사이트의 성능 측정 및 향상 방법)

  • Park, Yang-Jae
    • Journal of Digital Convergence
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    • v.15 no.9
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    • pp.223-230
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    • 2017
  • In the current wireless Internet environment, using a mobile device to quickly access a web site is closely related to measuring the performance of a website. When accessing a website, the user has a long time to access the website and has no access to the website.In this case, the performance of the web site should be improved by measuring and analyzing the performance of the connection delay due to a problem of the web site.Among the performance measurement factors of Web sites, Web page loading time is a very important factor for a successful service business in the situation where most of e-commerce business is being developed as a web-based service.An open source tool was analyzed to analyze the performance of the e-commerce web page to present problems, software optimization methods and hardware optimization methods. Applying two optimization methods to suit the environment will enable stable and e-commerce websites.

Security Vulnerability and Countermeasures in Smart Farm (스마트 팜에서의 보안 취약점 및 대응 방안에 관한 연구)

  • Chae, Cheol-Joo;Han, Sang-Kyun;Cho, Han-Jin
    • Journal of Digital Convergence
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    • v.14 no.11
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    • pp.313-318
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    • 2016
  • Recently, the smart farm development using a PC and smart phone to manag the farm for improving competitiveness is in progress. In the smart farm, by using the various ICT technology including RFID, Wi-Fi, ZigBee, Wireless LAN, and etc., the growing environment of the crop and animals can be managed with the remote. By using the network including not only the TCP/IP based wired network but also ZigBee, Wireless LAN, and etc., each of the devices installed in the smart farm transmits the growing environment data to the server. So, smart farms have information and network security vulnerability. Therefore, we propose the method that analyzes the security vulnerability which can begenerated in the smart farm and user authentication method.

Probability-based Deep Learning Clustering Model for the Collection of IoT Information (IoT 정보 수집을 위한 확률 기반의 딥러닝 클러스터링 모델)

  • Jeong, Yoon-Su
    • Journal of Digital Convergence
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    • v.18 no.3
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    • pp.189-194
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    • 2020
  • Recently, various clustering techniques have been studied to efficiently handle data generated by heterogeneous IoT devices. However, existing clustering techniques are not suitable for mobile IoT devices because they focus on statically dividing networks. This paper proposes a probabilistic deep learning-based dynamic clustering model for collecting and analyzing information on IoT devices using edge networks. The proposed model establishes a subnet by applying the frequency of the attribute values collected probabilistically to deep learning. The established subnets are used to group information extracted from seeds into hierarchical structures and improve the speed and accuracy of dynamic clustering for IoT devices. The performance evaluation results showed that the proposed model had an average 13.8 percent improvement in data processing time compared to the existing model, and the server's overhead was 10.5 percent lower on average than the existing model. The accuracy of extracting IoT information from servers has improved by 8.7% on average from previous models.

A Study on the Modus Operandi of Smishing Crime for Public Safety (국민안전을 위한 스미싱 범죄수법분석)

  • Choi, Kwan;Kim, Minchi
    • Convergence Security Journal
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    • v.16 no.3_2
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    • pp.3-12
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    • 2016
  • The purpose of this study is to analyse Modus Operandi of smishing. For the study, 87 cases of smishing crime reports and smishing experiences of victims were analysed and 10 police officers who investigates smishing crime were interviewed. The results indicated that smishing crime can be divided into the preparation stage and the implementation stage. In the preparation stage, two modus operandi patterns, collection of personal information and text message script composition, were identified. In the implementation stage, seven modus operandi patterns were identified: sending smishing text messages and installation of malicious mobile applications, leak personal information, sending personal information to smishing crime organization through online server, payment attempt using collected personal information, intercept authorization code, completion of payment using intercepted authorization code, and payment amount was delivered to victims. Further implications were discussed.

Building Sensor P2P Network Design using Embedded System (임베디드 시스템을 이용한 빌딩 센서 P2P 네트워크 설계)

  • 이정기;이준
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.6
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    • pp.1086-1090
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    • 2004
  • Architecture generation is the first step in the design of software systems. Most of the qualities that the final software system possesses are usually decided at the architecture development stage itself. Thus, if the final system should be usable, testable, secure, high performance, mobile and adaptable, then these qualities or non-functional requirements should be engineered into the architecture itself. In particular, adaptability is emerging as an important attribute required by almost all software systems. The machinery and tools in the remote site surveillance and connects intelligence information machinery and tools at Internet. We need the server which uses different embedded operating system to become private use. With the progress of information-oriented society, many device with advanced technologies invented by many companies. However, the current firmware technologies have many problems to meet such high level of new technologies. In this paper, we have successfully ported linux on an embedded system, which is based on intel Strong ARM SA-1110 processor, then written several network modules for internet-based network devices.

Design and Implementation of Middleware for Smartphone Environments (스마트폰 환경을 위한 미들웨어 설계 및 구현)

  • Kim, Kyoung-Ju;Moon, Sang-Ho;Yu, Young-Jung;Park, Seong-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.3
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    • pp.597-604
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    • 2011
  • The various Smartphone platforms that are used currently make difficult to build efficient applications("apps") for Smartphone. Introduction of middleware in the Smartphone environment is being studied to solve this problem. By enhancing interoperability between server systems and Smartphone platforms as introducing this middleware supports efficiently for Smartphone apps to be developed and managed. Thus, the development of this middleware for Smartphone has become essential for the purpose of responding actively to the rapidly expanding Smartphone market. In this research, we designed and implemented Smartphone middleware which optimizes the cost and time for developing new application service and maintaining it. In order to test this implemented middleware's performance and its capabilities, we also developed university Smartphone apps and activated campus twitter.

Development of an AVL System for Fire Fighting Services (소방용 AVL 시스템 개발)

  • Kim, Dong-Yong;Moon, Sang-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.4
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    • pp.886-892
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    • 2010
  • It is possible to use wireless communication any time in every place because of well-developed wireless networks and mobile devices. The AVL(Automatic Vehicle Location) system, therefore, has made practical use in situation control, distribution industry, home delivery service, and ITS(Intelligent Transportation System) area. In this paper, we design and implement an AVL system in order to use for fire fighting activities such as emergency rescue and relief. To do this, first, we investigate and analyze the existing researches and systems related to AVL system. In details, we develop an AVL server and clients to support stable communication each other using wireless networks. Using AVL system, calling cars find the position of accidents quickly and the fire defense headquarters control unforeseen accidents efficiently because the state of calling cars are confirmed in real time by their GPS data.

Efficient Multicasting Mechanism for Mobile Computing Environment (교육 영상제작 시스템 설계 및 구현)

  • Kim, Jungguk;Cho, Wijae;Park, Subeen;Park, Suhyun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.05a
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    • pp.482-484
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    • 2017
  • Over the past 70 years, movies and television have revolutionized the way people communicate. However, even with this development, TV has been used only as a means of communication targeting an unspecified number of people due to the restriction of media such as radio waves and movies. However, the development of the Internet and online video has come to a time when 100 million people watch YouTube videos uploaded from the other side of the world by eliminating these restrictions. The message that you want to deliver now can be delivered to anyone, but making the image with these messages remains the last obstacle to communication. To solve these problems, we implemented a web application and a video production program through AWS. This system basically provides the administrator with the video production through the easy interface, the information management and the program on the server on the internet through AWS, the assigned lecture including the computer and the smart phone, the learning materials, And implemented to increase the efficiency of educational video production service.

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