• TTA Journal
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• s.70
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• pp.94-104
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• 2000

현재 ITS 전용 통신장치로 사용되고 있는 DSRC(Dedicated Short Range Communication) 시스템은 우선적으로 ETC(Electronic Toll Collection) 시스템에 사용되고 있으며, 여러 가지 ITS 서비스로 활용이 예상된다. 유럽과 일본, 미국에서는 이미 국가 또는 지역표준이 승인되었고, 국내에서는 초안이 완성된 단계이다. 본 고에서는 외국의 DSRC 규격에 대해 개략적인 설명을 하였다.

• 한국ITS학회:학술대회논문집
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• 2002.11a
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• pp.100-103
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• 2002

• 한국ITS학회:학술대회논문집
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• 2002.11a
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• pp.108-111
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• 2002

• Journal of Information Management
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• v.34 no.4
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• pp.85-107
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• 2003

This paper describes the results of a usage analysis on the scientific and technical journals in order to optimize the collection development at KISTI. By comparing usage data for the journals from 1997/2002, this study identifies the short-term changes in journal use, which were shown on the subject field, language, publication country, SCI journal and electronic journal. The changing of journal use has important implications for collection development strategy in sci-tech libraries.

• Journal of the Korean Society of Safety
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• v.17 no.4
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• pp.25-30
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• 2002

This paper demonstrates the effects of dust electrical resistivity on electrostatic precipitability. The effects of gas temperature, velocity and humidity on the collection efficency were considered by used of coal fly ashes from fluidized bed combustion boiler. The experiments for collection efficiency were carried out in the pilot plant. The ashes which have non-spherical geometry and high electrical resistivity were used. Electrical resistivity is an important property for the collection efficiency in the electrostatic precipitators. Fly ash resistivity as a function of temperature up $350{\circ}C$ and water concentration(up to 15%) has been experimentally investigated using the resistivity test equipment consisted of the movable electrode, dust cup, and furnace. As the resistivity of fly ash in the operating temperature($150{\circ}C$) of an electrostatic precipitator was measured higher than $1010{\Omega}{\cdot}$cm, flue gas conditioning in the electrostatic precipitator to reduce the resistivity of fly ash is required.

• Journal of the Korean Society for information Management
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• v.24 no.3
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• pp.343-362
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• 2007

The purpose of this study is to design and implement an ontology-based retrieval system for the electronic records of universities and to compare its performance with the existing keyword-based retrieval system. We used OntoStudio 1.4 for implementing an ontology-based retrieval system, and the test collection consisted of the following: (1) 5,099 electronic records of the 'personnel management notification' created by Korea Maritime University, (2) 20 topics (10 short-topics and 10 long-topics), and (3) the relevant assessments were conducted by the group of human experts. 10 university staff participated in the experiment of keyword-based searching and used the same test collection as used in the experiment of ontology-based searching. The ontology-based retrieval system outperformed to the keyword-based retrieval system in terms of Recall and Precision, and the same results showed in the test of the short-topics and long-topics comparison.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.6
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• pp.1053-1060
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• 2019

The satellite antenna for collecting information is mainly classified into reflector antenna, lens antenna, and phased array antenna. Among them, the phased array antenna with the excellent antenna pattern control performance for a multi-beam system is frequently used. Although the terrestrial signal information collection based on the satellite is not much effected geographically, it requires the accurate angle-of-arrival (AOA) information of the interesting signal. In this paper, we discuss the characteristics and the advantages/disadvantages of the antenna array shape employed in the phased array antenna. In addition, we present the Cascade AOA estimation algorithm based on a square array antenna mounted on the satellite receiver, and show the performance evaluation results through the computer simulation.

• Journal of Korean Library and Information Science Society
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• v.34 no.4
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• pp.43-66
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• 2003

Nowadays many academic libraries have considered and some have implemented the just-in-time(access) approach to collection development especially of scholarly journals. The adaption of the scholarly electronic journal based on access paradigm has brought a number of advantages and disadvantages to academic libraries. Electronic journals have promised rapid delivery of the latest research to the desktop through the ubiquitous platform of the Internet. But the promise of the e-journal is not yet a reality, and there are many misconceptions about what is actually available today. The objective of this paper is to analyse the probabilities of digital achilles tendon of scholarly journals resulting from a decline of purchase power, absence of selection(evaluation) criteria, superfluities and abuses of impact factor, access paradigm and halo effects, mismatching of demand-supply, md insufficiency in subject gateway functions.

• Journal of Information Management
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• v.33 no.4
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• pp.25-55
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• 2002

In most libraries and information centers, access versus ownership is the new dilemma facing in view of the rapidly change of information technologies, the rising costs of serials, and not equally increasing budgets. And libraries and information centers are now confronted with the fact that the more users bypass the library's resources in favor of the results they can get with an ordinary Internet search engine. The purpose of this study is to analyze a difficult problems related to information resources development in digital world with priority given to accesscentered paradigm, the grounds of an argument and fallacy of physical collection building, and limitations of electronic publication.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.8
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• pp.528-537
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• 2014

Wireless Sensor Network(WSN) is a network which consists of sensor nodes(SNs) in data collection area. It is hard for the SNs to replace battery. Thus energy and transfer efficiency is important because the energy is limited. In this paper, we propose energy-efficient data collection algorithm for wireless sensor networks by using mobile agent in distance-based cluster structure. For avoid collisions and guarantee low latency, make distance-based topology and build cluster by the topology. For performance comparison of the proposed algorithm, compare with existing mobile agent algorithm. When network constructed by 300 nodes, proposed algorithm has performance increase than existing algorithm(GCF, LCF, TBID) in network lifetime 194, 124.6, 1.46 times each and data merging energy efficiency 87.5%, 85%, 45% each.