• Communications of the Korean Institute of Information Scientists and Engineers
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• v.26 no.9
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• pp.13-22
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• 2008

• Proceedings of the CALSEC Conference
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• 2001.08a
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• pp.1-10
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• 2001

정부기관의 내부업무화 대민 서비스를 하나의 창구에서 제공할 수 있는 정부의 대표관문(Portal Site)으로서, 고객중심적으로 모든 전자적 민원인에게 유용한 정부서비스를 제공하는 젓을 목적으로 구축된 Portal 시스템(중략)

• The Journal of the Korea Contents Association
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• v.5 no.4
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• pp.1-10
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• 2005

After Yahoo Korea opened up the Internet portal market in Korea in 1997, the Korean portal market has experienced fierce competition in the beginning of 2000s. After that period, however, Korean portal market looks relatively stable with top five rankers forming oligopoly and shows that Arthur's claim of network externalities can be applied to the portal industry. In this paper, based on case study of the Korean portals we empirically examined how portals have developed and evolved. In this course, we also investigated the sources of portal's competitiveness. The findings of the research suggest that portals develop and evolve through the reflexive four stages in which they compete over different goals: 1) service quality, 2) critical mass of customers, 3) interpersonal interactivity, and 4) innovative service. According to this framework of portal's evolution, we show that top ranking portals in the present have succeeded in accomplishing the goals of each stage.

• Journal of the Korean Arthroscopy Society
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• v.12 no.2
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• pp.118-124
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• 2008

Purpose: Recent development and advances in the arthroscopic surgical techniques for anterior cruciate ligament(ACL) reconstruction have led to the ideal location for more oblique anatomic point of the femur from 10 to 10:30 o'clock(in the right knee) and from 2 to 1:30 o'clock(in the left knee) in the frontal plane. This study was performed to compare the operative methods and the radiologic results of the femoral tunnels made through the tibial tunnel(trans-tibial approach) and the anteromedial portal. Materials and Methods: From January 2003 to May 2004, on hundred reconstructions of ACL were performed. Group I(the femoral tunnel made through the tibial tunnel) consisted of 50 cases and group I(the femoral tunnel made through the anteromedial portal) consisted of 50 cases. The operative methods and the radiographic results of the femoral tunnels were compared. Results: Femoral tunnel was made more easily at more oblique anatomic point in group II than in group I. In group II, better visual field was achieved at the angle of 100? flexion of the knee joint, the risks of the posterior cortical breakage and the tunnel-graft mismatching were reduced more, and the divergence of femoral interference screw from the radiograph decreased more than in group I(p<0.05). The angle between the femoral tunnel and the longitudinal axis of ACL increased in group II. Conclusion: Anteromedial portal technique was useful for femoral tunneling toward 10 to 10:30 o'clock(in the right knee) and 2 to 1:30 o'clock(in the left knee) in ACL reconstruction. Level of Evidence:Level III, case-control study.

• Journal of the Korean Association of Geographic Information Studies
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• v.22 no.4
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• pp.146-157
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• 2019

This study, as a pilot study to implement and extend the marine healing which has been rapidly extending oversea areas into the domestic market, has collected seven major marine healing resources such as ocean water, sand, salt, mud, seaweeds, forest, and weather targeting selected four pilot municipalities and established a GIS DB. Furthermore, web GIS based marine healing portal has been established to support the easier utilization of the GIS DB and various marine healing related contents, thereby facilitating expansion of related industry. The portal includes marine thematic maps as well as research papers, related therapy manuals, and various activities and programs of the pilot municipalities. It is expected that the portal would contribute to the expansion of the domestic marine healing industry significantly through the pilot operation of the portal, not to mention of the needs of subsequent studies for expansion of the marine GIS DB and securing more various contents.

• Journal of Korean Society for Geospatial Information Science
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• v.13 no.4 s.34
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• pp.75-81
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• 2005

This study intended to show the way of evolving 'National Geographic Information Clearinghouse' to 'National Integrated Geospatial Portal'. For this purpose we have analyzed Geospatial One-Stop Portal in the US and then suggested future model of National Geographic Information Clearinghouse. The Integrated Geospatial Portal model is based on the Reference Model for Open Distributed Processing(RM-ODP) which is an international model for information distribution and sharing. The Integrated Geospatial Portal architecture consists of the data layer, middle-ware, presentation layer. It will help users to determine their fitness for nation wide GIS application and provide tools for accessing, visualizing, or ordering various geospatial data.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.3
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• pp.1345-1354
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• 2014

This paper has analyzed how the format of the text page and the contents of space surrounding the text in the news stories of the portal sites are made-up. The result of analysis showed that the formats of the text page in Naver news story were more intricate than those of Daum, Nate and Yahoo. Also, Naver was higher in the number of advertising, the type of advertising, the entertainment contents, and various types of contents than other three portals. Especially, the percentage of new story related to entertainers was the highest. It was the portal site Daum that advertised the news story most of all in its text page. In contrast, it was portal site Yahoo that inserted the advertisements least of all. But from the whole sides, it was found that the formats and contents of the text page of the news story in these three portal sites have similarly been made-up. Consequently speaking, for the serviceability of use in news story, it can be evaluated that the news service method in portal sites is higher than that in press dot coms.

• Radiation Oncology Journal
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• v.17 no.3
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• pp.249-255
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• 1999

Purpose : The purpose of this study is to investigate fundamental aspects of the dose response of fluorescent screen-based electronic portal imaging devices (EPIDS). Materials and Methods : We acquired scanned signal across portal planes as we varied the radiation that entered the EPID by changing the thickness and anatomy of the phantom as well as the air gap between the phantom and the EPID. In addition, we simulated the relative contribution of the scintillation light signal in the EPID system. Results : We have shown that the dose profile across portal planes is a function of the air gap and phantom thickness. We have also found that depending on the density change within the phantom geometry, errors associated with dose response based on the EPID scan can be as high as $7\%$. We also found that scintillation light scattering within the EPID system is an important source of error. Conclusion : This study revealed and demonstrated fundamental characteristics of dose response of EPID, as relative to that of ion chambers. This study showed that EPID based on fluorescent screen cannot be an accurate dosimetry system.

• Journal of the Korea Society of Computer and Information
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• v.13 no.3
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• pp.131-138
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• 2008

This paper designed an Internet Convention e-Portal Information System through an experience and knowledges accumulated in case of information utilization regarding international meeting and conventions in knowledge information societies. Established the Non-stop Cluster system that was the H/W side, L4 and the applied system which was the 3-tier structure and Firewall, VPN, IDS/IPS security control system, S/W side, that utilized the WAS MVC architecture used WAS and a SOA architecture. an ASP EAI function. A user and a manager, designs and constructor, the user efficiency who were an evaluation basis of a Verification commissioner, Ubiquitous evaluated system stability. Information security anger, and evaluated former system and comparison. Therefore is evaluated to the excellent Convention e-Portal Systems that a performance 25.9% improvement consisted of compare with the existing Convention e-Portal Systems, and will contribute so as to be able to carry out-driven enemy role in development of the industrial our country Convention Ubiquitous Internet IT information Industry and International Society Conventions.

• Journal of Sensor Science and Technology
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• v.5 no.5
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• pp.11-20
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• 1996

In this paper, the characteristics of therapy radiation diode sensors have been studied by using therapy radiation from the MM22 microtron accelerator. The linearity, reproducibility and error ratio were measured for feasibility as a radiation detector. Energy dependence, sensitivity change after a amount of irradiation and output value according to a number of diodes were also measured for same purpose. We have formed pulse shaping of diode signal with nuclear instruments for portal image reconstruction. The percent depth dose ratio according to field size and depth was compared with that of the detector of a ion chamber. Using thirteen silicon diodes, we can directly read diode outputs on a computer monitor after A/D conversion with 16 channels analog to digital conversion board with 12 bit resolution. The possibility for portal image with diodes has been suggested from output comparison between output value with a human phantom and that without a human phantom.