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Hierarchical Session Management for Large Scale Sessions
Kyungran Kang,Kilnam Chon 한국정보과학회 1998 Journal of Electrical Engineering and Information Vol.3 No.5
Modern powerful computers connected by high-speed networks offer the opportunity to build interactive programs supporting collaboration. As result, the scale of such collaboration will increase dramatically like hundreds and thousands. Existing systems for multiparty sessions does not consider such a large number of participants. Centralized system will have the central management object overloaded with membership control functions and floor control functions. Distributed system will have the participants confused with uncontrolled manner of interactions. This paper suggests a way to lessen the load of the session manager by introducing hierarchical session structure. The participants are divided into multiple groups and each group has its own manager. The members' floor control requests are processed by its group manager. The group managers interact with the session manager to coordinate the interactions among the whole participants based on the session control policies. This paper describes the management components and the way to carry out the session management functions. The proposed approach will be compared with other large scale session approaches.
USS Monitor: A Monitoring System for Collaborative Ubiquitous Computing Environment
Kyungran Kang,Jihwan Song,Jinhyung Kim,Heejung Park,We-Duke Cho IEEE 2007 IEEE transactions on consumer electronics Vol.53 No.3
<P>This paper introduces a monitoring system, USS monitor for a collaborative ubiquitous computing environment where the applications collaborate to achieve a service goal. We design USS monitor concerning the visualization of the collaboration and the variability of the applications in the main. The monitoring system includes the mechanisms to collect and visualize the state of the member applications for collaboration as well as the resource state of the machines. In addition, concerning the variability of the applications in the ubiquitous computing environment, we design an interaction protocol and the scalable message format between the monitor and the monitored entities. USS monitor is a set of processes and implemented using Java and C. It is operating in the testbed for collaborative ubiquitous computing environment.</P>
강경란(Kyungran Kang),전길남(Kilnam Chon) 한국정보과학회 1995 정보과학회논문지 Vol.22 No.8
호스트 그룹은 호스트들의 모임이다. 호스트 그룹 내의 호스트들은 각자 식별자를 갖지만, 하나의 호스트 그룹 주소를 통해 동시에 접근 가능하다. 호스트 그룹을 구현한 것으로 인터네트 프로토콜 멀티캐스트(Internet Protocol Multicast)가 있다. 그런데 이는 주소를 관리하는 매카니즘을 갖고 있지 않다. 이 논문에서는 관심을 갖는 문제점은 두 가지이다. 첫째, 다중 사용자 프로그램을 개발할 경우, 서로 다른 목적으로 운용되는 프로그램들이 동일한 주소를 사용하려고 하면 서로의 작업을 방해하게 되는 결과를 낳는다. 둘째, 인터네트 프로토콜 멀티캐스트에서는 메시지를 보낼 때 송신자가 수신 그룹에 속하는지 점검하지 않는다. 이로 인해서 고의든 실수든 외부에서 온 메시지에 의해 그룹의 작업이 망쳐질 수 있다. 위의 문제점을 해결하기 위해 ‘호스트 그룹 관리 시스템’을 설계하고 구현하였다. 이 시스템의 응용 프로그램으로 다중 사용자 응용 프로그램의 일종 공유 편집기(Shared Editor)를 만들었다. A host group is a set of hosts, which is identified by the group address. Each host of the group has the identifier but all of them can be accessed by the group address at the same time. Internet Protocol(IP) Multicast is an implementation of host group. It has no multicast address management mechanism. This paper concerns about two problems. First, there can be more than two different application groups which have the same host group address at a given time. Messages from a group may disrupt the operation of the other groups. Second, IP Multicast never checks whether the sender is the member of the receiver group. As a result, intentionally or by mistake, a message can interrupt the work of a group. To solve the above mentioned problems, we develop the host group management system. We show a sample application shared editor is built using the host group management library.
Park, Jihoon,Kang, Taesun,Heo, Yong,Lee, Kiyoung,Kim, Kyungran,Lee, Kyungsuk,Yoon, Chungsik Occupational Safety and Health Research Institute 2020 Safety and health at work Vol.11 No.1
Background: Ammonia and hydrogen sulfide are harmful gases generated during aerobic/anaerobic bacterial decomposition of livestock manure. We evaluated ammonia and hydrogen sulfide concentrations generated from workplaces at livestock farms and determined environmental factors influencing the gas concentrations. Methods: Five commercial swine farms and five poultry farms were selected for monitoring. Real-time monitors were used to measure the ammonia and hydrogen sulfide concentrations and environmental conditions during the manure-handling processes. Monitoring was conducted in the manure storage facility and composting facility. Information on the farm conditions was also collected through interview and walk-through survey. Results: The ammonia concentrations were significantly higher at the swine composting facilities (9.5-43.2 ppm) than at other manure-handling facilities at the swine and poultry farms, and high concentrations of hydrogen sulfide were identified during the manure agitation and mixing process at the swine manure storage facilities (6.9-19.5 ppm). At the poultry manure-handling facilities, the ammonia concentration was higher during the manure-handling processes (2.6-57.9 ppm), and very low hydrogen sulfide concentrations (0-3.4 ppm) were detected. The air temperature and relative humidity, volume of the facility, duration of manure storage, and the number of animals influenced the gas concentrations. Conclusion: A high level of hazardous gases was generated during manure handling, and some levels increased up to risk levels that can threaten workers' health and safety. Some of the farm operational factors were also found to influence the gas levels. By controlling and improving these factors, it would be possible to protect workers' safety and health from occupational risks.
IM, Kwang Bin,KANG, Kyungran,CHO, Young-Jong The Institute of Electronics, Information and Comm 2011 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.eb94 No.2
<P>This letter proposes a simple <I>k</I>-hop flooding scheme for the temporarily lost child node of a multicast tree in a mobile ad hoc network where a group of nodes move together within a bound. Through simulation, we show that our scheme improves the packet delivery ratio of MAODV to be comparable to the epidemic routing with only small additional duplicate packets.</P>