• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.05a
• /
• pp.674-677
• /
• 2012

An operating system acts as an intermediary between your computer hardware and computer users to perform, that the user can run the program provides an environment in which. Therefore, the main purpose of the operating system having a computer available for your convenience and to effectively manage computer hardware. The popularization of the people who use computers, improve hardware performance, advent of the internet, popularity of wireless networks, Smartphone and Tablet PC appearance, advent of virtualization technologies and cloud computing, etc. began making changes to the operating system. In particular, cloud computing environments based on server virtualization and using a variety of wired and wireless devices with internet connection, a Web-based operating system was born. In this paper, the definition of a Web-based operating system, types and characteristics, an analysis of the pros and cons, and find out about the future prospects.

• Proceedings of the IEEK Conference
• /
• 2005.11a
• /
• pp.1023-1026
• /
• 2005

In the ubiquitous computing environment, an intelligent vehicle is defined as a sensor node with a capability of intelligence and communication in a wire and wireless network space. To make it real, a lot of problems should be addressed in the aspect of vehicle mobility, in-vehicle communication, common service platform and the connection of heterogeneous networks to provide a driver with several intelligent information services beyond the time and space. In this paper, we present an intelligent information system for managing in-vehicle sensor network and a vehicle gateway for connecting the external networks. The in-vehicle sensor network connected with several sensor nodes is used to collect sensor data and control the vehicle based on CAN protocol. Each sensor node is equipped with a reusable modular node architecture, which contains a common CAN stack, a message manager and an event handler. The vehicle gateway makes vehicle control and diagnosis from a remote host possible by connecting the in-vehicle sensor network with an external network. Specifically, it gives an access to the external mobile communication network such as CDMA. Some experiments was made to find out how long it takes to communicate between a vehicle's intelligent information system and an external server in the various environment. The results show that the average response time amounts to 776ms at fixed place, 707ms at rural area and 910ms at urban area.

• Journal of Internet Computing and Services
• /
• v.16 no.3
• /
• pp.13-20
• /
• 2015

This paper proposes a Near Field Communication (NFC) communication system that exchanges information of digital business cards efficiently for many to many communication to solve inconvenience of one-to-one communication when people exchanges business cards each other in meetings such as conference, forum, seminar. The proposed system can provide people to exchange contact information one-to-one as well as multiple members at once using a digital business card system that consists a server and a database based on NFC communication. The system has been developed to collect business card information from a NFC reader and to transfer it directly to a smartphone application effectively. The system can manage business card information with the application effectively and provide security in order to prevent from leakage of private information when transferring contact data.

• Proceedings of the Korea Database Society Conference
• /
• 1994.09a
• /
• pp.131-146
• /
• 1994

Downsizing IS is rapidly emerging as one of new information systems of the 1990s that involve (1) the cost reduction, (2) the reduction of MIS staff, and (3) the transfer of IS functions to end-users. As downsizing is relatively new information systems, little is known about the causes, the process, or the consequences of downsizing. Case study was chosen as the research methodology of this study. The downsizing IS of Namsun Aluminum Co. was chosen for the exploratory case study. The detailed and qualitative analyses to Namsun were performed with the use of observation, participation, interview techniques. Consequently, the causes, the process, and the consequences of Namsun's downsizing were analyzed. As the main cause, downsizing was started with the purpose of cost reduction. The important consequences of downsizing are as follows ： (1) About 700 mi1lion won reduction in the cost of initially developing the downsizing was achieved. (2) Downsizing is performing Namsun's mission critical applications. (3) Namsun's downsizing could be considered to be SIS(strategic information systems).

• Journal of Internet Computing and Services
• /
• v.13 no.1
• /
• pp.57-63
• /
• 2012

Recently, Development of high-speed internet networks can be a real-time video conference system. SD-quality still images using the software codec system exists, and two-way system with mobile systems, but in most video only send and receive video system. In this study, HD web-cam using the two-way live broadcasts simultaneously in the education system and the mobile system has developed an audible system. In the study using the H.264 standard video compression techniques were applied to high-bandwidth compression technology, smart phones, to develop a streaming server for broadcasting were applied. Video sharing, document, web-sharing was made possible in real time. In addition, the private IP for WiFi zone, available anytime, anywhere that can be converted to a public IP technology, IP tunneling technology applied.

• Proceedings of the KSRS Conference
• /
• 2003.11a
• /
• pp.1188-1190
• /
• 2003

Taipei Watershed Management Bureau (WRATB) is a government agency entitled for water resources protection at two major watersheds in order to provide drinking water for about four millions population in Taipei on a sustainable basis. At WRATB, there are two major public sewage treatment facilities which can convert sewage in each watershed into an acceptable state before they were discharged into rivers. More than 82% of household wastewater have been collected and treated by the two public sewage systems. However, households at remote area still need more effective sewage management prescriptions. The objective of this paper is to implement geographic information systems in order to provide more effective approaches that sewage management can be easier and cost effective. ArcIMS was implemented for Internet browsing and map server of those sewage facilities on personal computers, laptop computers. In the open field, ArcPAD was implemented with personal digital assistant (PDA) such that compact flash type's global positioning systems (GPS) and digital camera can be utilized with PDA. All sewage facilities digital files were convert into ArcMap format files. MapObjects and visual BASIC were used to create sewage application modules to meet every single technician personal flavor. ASP.NET was implemented for Internet database manipulations of all sewage databases. Mobile GIS was the key component of GIS applications in the open field for sewage management on a basis of house by house. Houses at remote area, which can not cover by the two public sewage systems, were managed by PDA and laptop computers with GPS and digital camera. Sewage management at Taipei Watershed Management Bureau is easier both in the open field and in the office. Integration of GPS, GIS, and PDA makes sewage management in the open field much easier. ArcIMS, MapObjects, ASP.NET and visual BASIC make sewage management can be done in the office and over Internet.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2006.05a
• /
• pp.942-947
• /
• 2006

In KOWACO, flow measurement system using PDA has been developed and used since 2004. Even though this system has improved the reliability of the measured flow data, it still has some problems caused by the internet-based data manipulation scheme. We found that this kind of data handling method is not suitable because it causes frequent communication problems especially in fringe areas. To solve this problem, the structure and algorithms of existing system has been analyzed and an improved system is proposed. Besides, improvement study on the rate of change and the uncertainty of the flow data have been performed as well as the communication method between the Microwave Water Surface Current Meter and PDA adopting the state-of-the-art IT technology.

• KIISE Transactions on Computing Practices
• /
• v.23 no.4
• /
• pp.238-243
• /
• 2017

This paper presents a study regarding a systemic structure that forms a link between heterogeneous terminals and the WebRTC (Web real-time communication) based video-conferencing systems. This system consists of a WebRTC-based terminal, a signal server for the relaying of the necessary signals for media negotiations, an MCU provides an interworking interface for the heterogeneous terminal, and the heterogeneous terminals that interwork with the MCU. This technology enables the interoperability between the WebRTC-based video-conferencing solutions and the legacy devices. In addition to reducing the replacement costs regarding new-technology-based solutions, the existing legacy equipment enables the use of multiparty-conference, thereby increasing the use ability of the conferencing systems.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.05a
• /
• pp.560-563
• /
• 2003

In this paper describes for use Authentication with the WPKI and Kerberos protocol. this paper is the security structure that defined in a WAP forum and security and watches all kinds of password related technology related to the existing authentication system. It looks up weakness point on security with a problem on the design that uses wireless public key-based structure and transmission hierarchical security back of a WAP forum, and a server-client holds for user authentication of an application level all and all, and it provides one counterproposal. Therefore, We offer authentication way solution that connected X.509 with using WIM for complement an authentication protocol Kerberos and its disadvantages.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.05a
• /
• pp.704-711
• /
• 2003

Recently, the demands for real-time service and multimedia data are rapidly increasing. There are significant redundancies between header fields both within the same packet header and in consecutive packets belonging to the same packet stream. But there are many overheads in using the current UDP/IP protocol. Header compression is considered to enhance the transmission efficiency for small size of payload. By sending the static field information only once initially and by utilizing dependencies and predictability for other fields, the header size can be significantly reduced for most packets. This work describes an implementation for header compression of the headers of U/UDP protocols to reduce overhead on Ethernet network. Typical UDP/IP Header packets can be compressed down to 7 bytes and the header compression system is designed and implemented on the Linux environment. Using the designed Header compression system between a server and a client have the advantage of effective data throughput in network.