• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.18 no.6
• /
• pp.221-228
• /
• 2018

The purpose of this study is to design and implement a maritime telemedicine system to provide the best medical service for patients who rescue and happens in sailing ship. For this purpose, INMARSAT and MVAST, which are necessary communication channels for maritime telemedicine, were examined and diversity in maritime communication path was suggested. It was implemented to enable maritime telemedicine by linking smart devices and medical devices for physical examination. The marine telemedicine system adopts the HTTP communication protocol to configure the web server and process the client request. The patient's chart information was entered using an application for AndroidPad and the patient was diagnosed using Bluetooth electronic stethoscope for diagnosis. This system enables appropriate medical treatment to emergency patients at maritime, which ultimately can improve medical services. It is expected to be a more effective medical support system through linkage with various medical equipment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.646-648
• /
• 2012

In this paper, android phone information push system based on the XMPP protocol is proposed. It uses Java and eclipse development tools to create an information pushing system in android phone based on the XMPP protocol, and runs on the C/S network situation. Not only, the information can be send and receire form android phone in the PC server, but also the smack packet of the android phone is used fully by this system. Therefore, the speed of the transmission and the transfer are better than other sending sportocol in the basic XMPP protocol of the system.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.3
• /
• pp.561-566
• /
• 2013

In this paper, android phone information push system based on the XMPP protocol is proposed. For this, we implement a XMPP(eXtensible Message and Presence Protocol) based instant message system in C/S network environment by using Java language and eclipse device. This system not only allows sending and receiving messages from the PC server to mobile phone client, but also enables the expansion into the smack package of an android phone. Thus, this system shown, in this paper has the better performance in transmission and transfer speed than those of the basic XMPP protocol system.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2014.11a
• /
• pp.14-16
• /
• 2014

가상 데스크탑 시스템은 단일 물리적 서버상에 가상화 기술을 사용하여 다수의 가상 머신을 실행하고, 이를 네트워크로 연결된 클라이언트에서 사용하는 기술이다. 가상 데스크탑에는 저장장치의 역할을 하는 가상 데스크탑 이미지가 연결되며, 본 이미지에는 운영체제 및 필요한 응용 프로그램이 설치되어 배포된다. 따라서, 새로운 가상 데스크탑을 생성할 때 가상 데스크탑 이미지를 함께 생성해야 하며, 이는 저장장치를 사용한 작업으로 시간이 많이 소요되는 작업이다. 본 논문에서는 이미지 풀을 사용한 빠른 가상 데스크탑 생성 방안을 제안한다. 이미지 풀은 일정 수의 가상 데스크탑 이미지를 포함하고 있으며, 이미지 준비기는 이미지 풀에 있는 이미지의 개수가 일정하게 유지되도록 골든 이미지에서 복사해오는 역할을 담당한다. 가상 데스크탑 생성시, 이미지 풀에서 필요한 이미지를 지연시간 없이 바로 가져옴으로써, 가상 데스크탑 생성에 소요되는 시간을 감소시킬 수 있다.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.1 no.2
• /
• pp.67-79
• /
• 1998

Most GIS applications are read-intensive on a large number of spatial objects and when the spatial objects are composite objects, the contained objects within the composite objects are also accessed. In GIS applications, creation, deletion, and update operations on spatial objects occur very rarely, but once they occur they deal with a large number of spatial objects. This paper proposes the concept of the multi-level pre-fetch query to retrieve a large number of spatial objects efficiently, and the functionality of the deferred-flush on the newly created persistent objects into the database with the optimal performance, and presents the design and implementation details of those ideas into an object-oriented DBMS BADA-III while considering these characteristics of GIS applications. The multi-level pre-fetch query retrieves the objects that satisfy the query and the objects that are contained within the objects up to the level specified by users, and registers the retrieved objects on the client cache. The deferred-flush flushes a large number of composite objects that are created by the application with a minimal overhead of the server and a minimal number of communications between the client and the server. These two functionality are suitable for the applications that search or create a large number of composite objects like GIS applications.

• Journal of KIISE:Software and Applications
• /
• v.31 no.12
• /
• pp.1637-1648
• /
• 2004

When digital libraries are developed by the traditional client/sever system using a single agent on the distributed environment, several problems occur. First, as the search method is one dimensional, the search results have little relationship to each other. Second, the results do not reflect the user's preference. Third, whenever a client connects to the server, users have to receive the certification. Therefore, the retrieval of documents is less efficient causing dissatisfaction with the system. I propose a new platform of mobile multiagents for a personal digital library to overcome these problems. To develop this new platform I combine the existing DECAF multiagents platform with the Voyager mobile ORB and propose a new negotiation algorithm and scheduling algorithm. Although there has been some research for a personal digital library, I believe there have been few studies on their integration and systemization. For searches of related information, the proposed platform could increase the relationship of search results by subdividing the related documents, which are classified by a supervised neural network. For the user's preference, as some modular clients are applied to a neural network, the search results are optimized. By combining a mobile and multiagents platform a new mobile, multiagents platform is developed in order to decrease a network burden. Furthermore, a new negotiation algorithm and a scheduling algorithm are activated for the effectiveness of PDS. The results of the simulation demonstrate that as the number of servers and agents are increased, the search time for PDS decreases while the degree of the user's satisfaction is four times greater than with the C/S model.

• Journal of KIISE:Databases
• /
• v.29 no.4
• /
• pp.321-333
• /
• 2002

As web-based services are becoming more and more popular, concurrent updates of spatial data should be possible in the web-based environments in order to use the various services. Web-based GIS applications are characterized by large quantity of data providing and these data should be continuously updated according to various user's requirements. Faced with such an enormous data providing system, it is inefficient for a server to do all of the works of updating spatial data requested by clients. Besides, the HTTP protocol used in the web environment is established under the assumption of 'Connectionless'and 'Stateless'. Lots of problems may occur if the scheme of transaction processing based on the LAN environment is directly applied to the web environment. Especially for long transactions of updating spatial data, it is very difficult to control the concurrency among clients and to keep the consistency of the server data. This paper proposes a solution of keeping consistency during updating directly spatial data in the client-side by resolving the Dormancy Region Lock problem caused by the 'Connectionless'and 'Stateless'feature of the HTTP protocol. The RX(Region-eXclusive) lock and the periodically sending of ALIVE_CLIENTi messages can solve this problem. The protocol designed here is verified as effective enough through implementing in the main memory spatial database system, called CyberMap.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.30 no.2B
• /
• pp.36-43
• /
• 2005

This paper suggests a method to effectively apply an application model of fuzzy-neural network to the optimal load distribution algorithm, considering the complication and non-linearity of the web server environment. We use the clustering web server in the linux system and it consists of a load balancer that distributes the network loads and some of real servers that processes the load and responses to the client. The previous works considered only with the scrappy decision information such as the connections. That is, since the distribution algorithm depends on the input of the whole network throughput, it was proved inefficient in terms of performance improvement of the web server. With the proposed algorithm, it monitors the whole states of both network input and output. Then, it infers CPU and memory states of each real server and effectively distributes the requests of the clients. In this paper, the proposed model is compared with the previous method through simulations and we analysis the results to develop the optimal and intelligent load balancing model.

• The Transactions of the Korea Information Processing Society
• /
• v.5 no.9
• /
• pp.2248-2255
• /
• 1998

The property of connectivity between DBMS and application system developed in java is very important under the distributed object environments with heterogeneous systems. In these days, mostly used JDBC 3-tier model, which supports the connectivity, has two problems: the one is the restricted connectivity needed for the Java applet as application programs and the other is the additional efforts to design and implemtnt in linking any application program with the middleware from being deficit of standard protocol. In order to solve these problems, we have worked on Enlarging the properties of JDBC 3 tier model by applying CORBA distributed object environments. Thus, the enlarged 3-tier model has an ORB-JDBC sub protocol for the client sub-protocol and a middleware whose property is supported by CORBA.

• Journal of Korea Multimedia Society
• /
• v.7 no.3
• /
• pp.377-387
• /
• 2004

This paper describes a tree-based conversational interface supporting efficient presentation of turn relations on online conversation. Most of conventional conversational interfaces are difficult to make use of formal conversation such as group meeting, decision-making, etc. due to very simplicity of a con versational interface and restriction of data structure of conversational messages. And a tree-based conversational interface supports formal conversation, but they are difficult to present turn relations because of jumpy display by locations of replied turns and distance between replied turns, etc. So this paper suggests a tree-based conversational interface to present efficiently turn relations using XML-based messages with merits of a text-based interface. The suggested conversational interface was implemented by using XML-, DOM, and JDK. And this paper showed that the conversational interface could be applied to conversation system using client- server architecture. Applications for the conversational interface are as follows: collaboration, distance teaming, online game, etc.