• Journal of Convergence Society for SMB
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• v.5 no.4
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• pp.5-10
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• 2015

With the advance of ICT, understanding the condition of network and analysing network monitoring have become an important issue. On the TCP/IP network, SNMP is the typical protocol that catches the condition of network by using polling method. If polling method is implemented for a long period, to catch the change of the condition of the network is not easy. On the other hand, in case of short-term polling, even if it could catch the condition of the network in real time, responsive messages to results of the polling cause the increase of traffic and therefore burden the network. There have been studies to control the overhead of responsive messages by controlling the polling period. However, not considering the characteristics of an agent, and running randomly, they cannot decrease the overhead although they would have an instant effect. This paper suggests an efficient polling method that decreases the traffic overhead of polling and catches the condition of the network in real time. Proposed method an polling for a short period and gave weight based on the characteristics of agents to catch the network condition, and a manager decided polling differentially based on the weight so that it decreased the overhead of polling traffic.

• Journal of Digital Contents Society
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• v.18 no.6
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• pp.1207-1211
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• 2017

Long-Reach PON (LR-PON) is a broadband access network using passive optical network (PON) technology which the reach is extended to 100 km or higher. A major challenge in LR-PON is that the propagation delay between OLT and ONUs is increased by a very significant amount. To effectively and fairly distribute the upstream bandwidth dynamically in LR-PON, we propose a new periodic and multi-thread polling based dynamic bandwidth allocation (DBA) algorithm. We compare the proposed algorithm with traditional DBAs and show its advantage on average packet delay. Numerical results are analyzed under varying offered loads.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.7B
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• pp.620-627
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• 2003

Ethernet passive optical networks (EPONs) are an emerging access network technology that provide a low-cost method of deploying optical access lines between a carrier's central office and customer sites. Dynamic bandwidth allocation (DBA) provides statistical multiplexing between the optical network units for efficient upstream channel utilization. To support dynamic bandwidth distribution, 1 propose an cyclic polling-based DBA algorithm for differentiated classes of service in EPONs. And, I show that an interleaved polling scheme severely decreases downstream channel capacity for user traffics when the upstream network load is low. To obtain realistic simulation results, I used synthetic traffic that exhibits the properties of self-similarity and long-range dependence I then analyzed the network performance under various loads, specifically focusing on packet delays for different classes of traffic.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.31-34
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• 2005

In this paper, we proposed a MAC protocol which can be used in power line communications(PLC). In the power line communication network, the data signal cannot travel long distance because of a serious attenuation. Consequently, we need to have a number of repeaters (amplifiers) in order to recover the signal power, which causes flooding problem in the network The proposed MAC protocol uses polling concept and solves the flooding problem in the power line communication network. The proposed protocol can be applied to power line communication networks for automatic power distribution control system. A mathematical analysis has been carried out to estimate the performance of the proposed protocol.

• Asian Journal for Public Opinion Research
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• v.2 no.1
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• pp.52-70
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• 2014

Gathering polling items about China and Japan from 1937 to 2011, we examine how Americans think about these two powerful East Asian countries. Our study investigates American attitudes from two perspectives. First, we analyze the content of polling items asked in the US about China and Japan to track changes in salient issues over a period of over 60 years. Second, by tracking repeated items, we show how American attitudes toward China and Japan have changed over time, both in long-term general favorability, and shorter-term perception of geopolitical, ideological, and economic threat in response to historical events.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.306-310
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• 2010

인터넷에서 정보를 제공하는 일반적인 형태는 클라이언트의 요청에 따라 웹 서버가 응답하여 제공하는 방식이다. 이러한 전통적인 방식은 클라이언트의 명시적인 요청에 따라 정보가 제공되기 때문에 급변하는 정보를 클라이언트가 적시에 제공받기에는 불편함이 따른다. 이러한 문제를 해결하기 위하여 다양한 연구들이 시도되고 있으며, Server Push는 전통적인 방식의 문제점을 극복하기 위하여 웹 서버에서 정보가 변할 때마다 클라이언트로 적시에 정보를 제공하는 방식이다. 본 논문에서는 Server Push 기반의 웹 어플리케이션 개발을 효과적으로 지원하는 Java Push Engine에 대하여 기술한다. Java Push Engine은 자바 기반으로 구현되어 플랫폼에 독립적인 Push 어플리케이션 개발을 지원하며, 다중화 통신을 지원하여 많은 클라이언트의 요청을 동시에 처리 할 수 있다. 또한 Java Push Engine과 함께 효과적인 비동기 통신을 수행하는 Push 클라이언트를 개발하기 위함 Ajax 기반의 Java Push Engine Java 스크립트에 대해서도 기술하다.

• 한국디지털정책학회:학술대회논문집
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• 2004.11a
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• pp.311-331
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• 2004

This paper addresses the democracy-oriented regulatory and legal requirements that e-democracy impacts. It demonstrates that the structure of the political system also plays a significant role in the decision to develop an e-voting application. The short term perspective of the questions put before the electorate obliterate the long term perspective in which many policy problems have to be seen. A well-designed e-voting system should produce an audit trail that is even stronger than that of conventional systems (including paper-based systems). Remote Internet voting systems pose significant risk to the integrity of the voting process, and should not be fielded for use in public elections until substantial technical and social science issues are addressed. Conclusively the paper focuses on the specific attributes an electronic voting (polling place) system should respect and ensure such as transparency, verifiability, accountability, security and accuracy in relation to the constitutional requirements such as General, Free. Equal, Secret, Direct and Democratic.

• Journal of the Korean Operations Research and Management Science Society
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• v.27 no.3
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• pp.59-74
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• 2002

This study investigates two basic operations of mobility management of PCNs (Personal Communication Networks), i.e., the location update and the paging of the mobile terminal. From the realistic consideration that a user either moves through several cells consecutively or stays in a cell with long time, we model the mobility pattern by introducing two types of CRT (Cell Residence Time). Mobility patterns of the mobile terminal are classified Into various ways by using the ratios of two types of CRT. Cost analysis is performed for distance-based and movement-based location update schemes combined with blanket polling paging and selective paging scheme. It is demonstrated that in a certain condition of mobility pattern and call arrival pattern, 2-state CRT model produces different optimal threshold and so, is more effective than IID ( Independently-Identically-Distributed) CRT model. An analytical model for the new CRT model is compact and easily extendable to the other location update schemes.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2483-2485
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• 2003

As design a network system that should command and response to do tasks by PLC, to make factory automation for being distributed facilities which are not guaranteed procedure, through polling method, commands are send orderly by PLC and responses are answered by each sub-unit. It make a guarantee of sequence and drive a master-slave operation in network. This method help to distribute procedure systems and make possible dividing tasks to each unit. To make this method, network protocol's format have Master or Slave ID and tasking data and Master's command or Slave unit's report. In network interpret algorithm, skip algorithm are included and it make guarantee of protecting data though network are in noise. Data that are made by this method are send to PC to transmit long-distance user by internet.

• Current Photovoltaic Research
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• v.3 no.1
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• pp.5-9
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• 2015

Absorption and luminescence characteristics of disperse red-19 (DR-19) and $TiO_2$ composite have been investigated with various poling electric field strengths. Two step synthetic processes were employed to employ the DR-19 to the $TiO_2$ sol-gel. Firstly, urethane bond formation between DR-19 (-OH) and 3-isocyanatopropyl triethoxysilane (ICPTES, -N=C=O) performed (ICPDR) prior incorporation to the $TiO_2$ sol-gel. Secondary, the hydrolysis of the ethoxy group from the ICPTES and condensation reaction between silanol groups from ICPTES and $TiO_2$ sol-gel were performed. The ICPDR and $TiO_2$ sol-gel ($DRTiO_2$) were mixed and stirred for several days. The composite was coated to the ITO coated glass substrate. Corona poling were performed before drying the composite with various electric field strengths. The absorption intensity decreased with the increase of the poling field strength, which resulted in the increase of poling efficiency. The photoluminescence also decreased as the poling field strength increased. There is long luminescence tail for the poled $DRTiO_2$ film compared with unpoled $DRTiO_2$ film. The luminescence long tail indicates that the self-trapped excitons and polarons were generated when the $DRTiO_2$ film was poled with electric field.