• Proceedings of the Korean Information Science Society Conference
• /
• 2002.10e
• /
• pp.439-441
• /
• 2002

지능형 교통시스템(ITS)은 기존의 교통 정보시스템에 첨단 통신기술을 접목하여 교통 시설 운용의 효율성을 극대화시키고, 향후 mobile office 구현을 목표로 활발한 연구 중에 있다. 또한 mobile office의 대표적인 서비스로는 Internet 서비스가 있으며, 현재 ISO／TC204 WGl6(CALM)에서 활발한 연구 중에 있다. 본 논문에서는 mobile office의 대표적인서비스 예로 인터넷 서비스 제공 시 무선환경에서 야기되어지는 핸드오프 방안에 대한 알고리즘으로 HiN-handoff 알고리즘을 제시하였다. HiN-handoff(handover) 알고리즘은 기존의핸드 오프 알고리즘의 보완방법으로 차량에서 고속 주행 시 단절구간을 미리 예측하여 handoff(handover)를 극복해 보고자 하는 알고리즘이다.

• Information and Communications Magazine
• /
• v.19 no.9
• /
• pp.77-85
• /
• 2002

In this paper, we introduce an ADSRC(hdvanced DSRC) OFDM packet communication system which has been developed by ETRI. The ADSRC system is targeted to provide high terminal mobility, high data rate and seamless service in roadside environment for mobile office services. We discuss the requirements of the ADSRC communication system for mobile office services, and the system design specification to meet them with regard to air interface. The ADSRC packet communication systems consist of the MAC processor block, the OFDM packet modem block and the RF block. The MAC processor block handles medium access control and the test. The OFDM packet modem transmits data packets at up to 24Mbps adaptively and recovers the data from RF block. We describe the ADSRC packet communication system architecture and the ADSRC system protocol.

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.47 no.6
• /
• pp.93-102
• /
• 2010

Existing web based information service system solutions show limitations in mobile information services, as well as problems such as uncertain error messages, and difficulty providing swift assistance or real time emergency support. In order to solve these deficiencies, a realtime wireless remote control system has been designed and implemented in this thesis, which is capable of managing and monitoring remote systems using mobile communication devices (Mobile Phone, PDA, Smart Phone) for realtime control. Proposed systems are applied at remote places, for instance 'office building', and a nursery school like 'kindergarten'. In the case of implemented at office building, it can be managing and controlling at real time all sorts of the sensor information that are installed at office building system environment through wire(web environment) or wireless(mobile device). In the other case at kindergarten system that are providing the real-time wireless remote control and monitoring system can be monitoring activity of kindergarten children with a mobile phone of authentication user. The security functions of proposed systems include mobile device user authentication and target system access control. The proposed systems allow real-time user authentication function and system access control function that improve the security of resource administrators and mobile device users, and provides not only uninterrupted services, but also real time mobile service environments.

• Journal of Digital Convergence
• /
• v.11 no.9
• /
• pp.201-207
• /
• 2013

Recently, the interest in a Mobile Office is increasing dramatically and the Smart Phone App Service begin in earnest to be requested in an area of applying SAP system to PC. This study aims to research the system which can be easily implemented with the configuration and Mobile App which cause difficulties in embodying SAP system-based Apps suitable for a mobile environment. First, by realizing SAP system interface that can operate in mobile devices in the form of GUI, assisting the connecting parts of SAP for the users-friendly set-up, providing the communication method of Client, Application, and SAP Service in the form of web service through TCP/IP, and finally showing cases of implementing the method of delivering the data request and result value of Server and Client in the form of XML suggest more effective and new method, the research suggests a new way of making the linkage of SAP more efficient.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.7 no.5
• /
• pp.1145-1151
• /
• 2012

Recently, the demand for mobile system is growing owing to the spread of smart phones to enable the real-time business process. This paper proposes the real-time facility maintenance management system using an android-based mobile application to apply to the facility defect/maintenance field for the apartment building complex. The proposed system model aims to develop the comprehensive management system to integrate the web and mobile system to lead to the realization of mobile office. The security measures required in the mobile system are technically analyzed and implemented on the system.

• Journal of Korea Society of Industrial Information Systems
• /
• v.26 no.3
• /
• pp.59-69
• /
• 2021

t Global logistics companies are developing and introducing logistics systems to provide competitive logistics services. Especially as IT develops and mobile functions become more convenient, the Mobile TMS(Transportation Management System) is being introduced as a more convenient system for delivery workers and office managers. However, the success of such a system depends on the system developer who understand the site accurately and office managers and couriers who are using it in the field. The purpose of this paper is to understand which characteristics influence in exploiting new systems focusing on the attitudes of users who use the system daily, and we analyze it through the TAM(Technology Acceptance Model). According to the analysis result, when smart phone has become popular, users have concluded that usefulness is more significant than ease in acceptance of the systems. As a result, we draw suggestions that the focus should be on usefulness rather than ease of system at the stage of system developed.

• Proceedings of the Society of Korea Industrial and System Engineering Conference
• /
• 2002.05a
• /
• pp.279-284
• /
• 2002

Nowadays, due to the popularization of mobile phone, the functions and using manners of mobile phone have been varied. According to Korea National Statistical Office, the numbers of domestic mobile phone user were 30 million at the end of March 2002. A survey was conducted to investigate the various using manners of mobile phone, especially the young ones from 15 to 28 years old. Two hundred and sixty people participated in this study. According to the result of this study, text messaging was one of the major functions of the mobile phone for the young people. Also, continuous and repetitive use of small key pad of mobile phone for text messaging could cause the repetitive strain injury on hand, especially fingers.

• ETRI Journal
• /
• v.19 no.3
• /
• pp.202-227
• /
• 1997

This paper describes the development of the CDMA mobile station to support non-speech, mobile office services such as data, fax, and short message service in addition to voice. We developed some important functions of layer 2 and layer 3. To provide non-speech services, we developed a terminal adapter and user interface software. The description of development process, software architecture and external interfaces required to provide such services is given. The description of a TTA-62 message analysis tool, a mobile station monitoring software, and an automatic test system developed for integration tests and performance measurements is also given.

• Journal of the Korea Society for Simulation
• /
• v.6 no.2
• /
• pp.71-79
• /
• 1997

In this paper, operations system was designed for the centralization of data processing of various state information from the facilities of mobile communication network. And the system performance experimental system module was measured and analyzed from the designed experimental system module. The configuration of system design was presented with the centralized type to monite and control the facilities of mobile communication network in the central office. The communication process design of the internal system was implemented with the resource of message queue having a excellent transmission ability for processing of a great quantity of information in the inter-process communication among communication resources of UNIX system. The process with a server function from the internal communication processes was constructed with a single server or a double server according to the quantity of operations and implemented with the policy of the presented server. And then, we have measured performance elements in accordance with the change of input parameters from the designed experimental module : response time, waiting time, buffer length, the maximum quantity existing in message queue. And from these results, we have compared and analyzed the system state each server algorithm according to performance variations.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.2 no.1 s.2
• /
• pp.93-100
• /
• 2003

In this farer, An ADSRC(Advanced Dedicated Short Range Communication) packet communication system developed by ETRI is introduced. The ADSRC system has been developed to provide high-speed, short-range wireless racket communication in roadside environment for mobile office services. The requirements of the ADSRC system for mobile office services and the system design specification to meet them with regard to mobile of nce environment are discussed. The ADSRC packet communication systems consist of the MAC(Medium Access Control) Processor block the OFDM() modem block and the RF block. The MAC processor block handles medium access control. The OFDM modem transmits data packets at up to 24Mbps adaptively and recovers the data from RF block. The ADSRC packet communication system architecture is described.