• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.245-246
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• 2017

현대인의 필수품이 되어버린 인터넷을 편리하게 활용할 수 있는 다양한 실용사례와 연구가 진행되고 있다. 본 연구는 수많은 웹 브라우저 중에서 사용자들의 가장 많은 활용하고 있는 Google사의 Chrome 웹 브라우저에서 다양한 기능들을 탑재시켜 인터넷 사용을 더욱 효율적으로 지원할 수 있는 Extension 기능을 소개한다. 또한 본 기능을 개발자들이 활용하여 다양한 응용 프로그램들을 탑재시켜 인터페이스를 향상할 수 있도록 구현한 사례를 소개한다. 본 시스템을 통해 웹 브라우저의 추가적인 부가기능과 사용자의 편의성을 더욱 발전시킴으로써 사용자들에게 도움이 될 것으로 기대하고 있다.

• Journal of Platform Technology
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• v.9 no.3
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• pp.3-17
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• 2021

Advanced persistent threat (APT) attacks are attacks aimed at a particular entity as a set of latent and persistent computer hacking processes. These APT attacks are usually carried out through various methods, including spam mail and disguised banner advertising. The same name is also used for files, since most of them are distributed via spam mail disguised as invoices, shipment documents, and purchase orders. In addition, such Infostealer attacks were the most frequently discovered malicious code in the first week of February 2021. CDR is a 'Content Disarm & Reconstruction' technology that can prevent the risk of malware infection by removing potential security threats from files and recombining them into safe files. Gartner, a global IT advisory organization, recommends CDR as a solution to attacks in the form of attachments. There is a program using CDR techniques released as open source is called 'Dangerzone'. The program supports the extension of most document files, but does not support the extension of HWP files that are widely used in Korea. In addition, Gmail blocks malicious URLs first, but it does not block malicious URLs in mail systems such as Naver and Daum, so malicious URLs can be easily distributed. Based on this problem, we developed a 'Dangerzone' program that supports the HWP extension to prevent APT attacks, and a Chrome extension that performs URL checking in Naver and Daum mail and blocking banner ads.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.543-546
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• 2021

최근 온라인 매체에서 무분별한 비속어나 욕설 사용이 늘어남에 따라 유해한 텍스트를 자동으로 필터링하는 시스템의 필요성이 증가하고 있다. 유해 텍스트 필터링 관련 기존의 접근방법은 채팅 프로그램 등 특정 프로그램에 한하여 적용이 되거나 특정 포탈의 웹페이지에 국한되어 적용이 되는 한계가 있다. 따라서 본 연구에서는 AI를 활용하여 모든 웹 페이지의 유해 텍스트를 필터링할 수 있는 Chrome Extension을 구현하고 그 유효성을 검증한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.181-184
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• 2020

사용자들은 필요한 자료 검색을 위해서 다양한 포털 사이트를 활용하고 있으며, 현재 구글을 이용한 활용이 증가하고 있다. 그러나 일반적으로 필터링을 위하여 사용자들은 구글에서 제공 되는 검색 연산자의 활용에 어려움을 격고 있다. 검색 연산자를 활용하여 검색의 효율성을 극대화 시켜 불필요한 검색 결과를 필터링하고 원하는 검색 결과를 획득 할 수 있는 효율적인 검색연산자의 사용 방법의 필요성이 제기 된다. 본 논문에서는 이러한 문제를 해결하고자 크롬의 확장 프로그램기능을 이용해서 일반인들이 크롬 환경에서 편히 검색 연산자들을 통해서 검색 결과를 필터링 할 수 있는 크롬 확장 프로그램을 Web/App으로 개발 하였다.

• The Journal of Korean Academy of Prosthodontics
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• v.8 no.1
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• pp.42-47
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• 1968

The purpose of this study was to determine the gingival response to the various restorations for 3 weeks, 5 weeks and 8 weeks respectively after they had been inserted in 36 tooth of 3 dogs. The histopathological observation was also performed to evaluate the effect of the various restorations on gingival tissue. They included gold, copper and nickel-chrome alloy. The following findings were obtained. 1. The gingivae adjacent to the well adapted and polished restorations and their margins with a level of gingival crest were grossly and histopathologically found no specific changes. 2. The gingive adjacent to the ill fitting and unpolished restorations and their margins with subgingival extension of 1 to 1.5mm were not grossly found any changes. 3. There were no obvious difference in gingival response among the various alloys in histopathological observation.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.515-516
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• 2006

The goal of total disc replacement is to restore pain-free mobility to a diseased functional spinal unit, by replacing the degenerated disc with a mobile bearing prosthesis. SB Charite III is named commercial product as the Artificial Intervertebral Disc (AID). SB Charite III consists of sliding core and endplate made by Ultra-high Molecular Weight Polyethylene (UHMWPE) and cobalt chrome alloy, respectively. To evaluate the effect of von-Mises stress in AID, and three-dimensional finite element model of AID analysis was preformed for four different loading types of sliding core. Consequently, endplate was compared with a compressive preload at 400N and flexion moment at $3{\sim}9Nm4. Therefore, this research has obtained result that von-Mises stress of sliding core in AID disc by radius curvature.

• The Journal of the Korean dental association
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• v.11 no.5
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• pp.353-358
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• 1973

The purpose of this study was to determine the gingival response to the various restorations for 3 weeks, 5 weeks and 8 weeks respectively after they had been inserted in 42 tooth of 5dogs. The histopathological observation was also performed to evaluate the effect of the variuos restorations on gingival tissue. They inclued gold, copper and nickel-chrome alloy. The following findings were obtained. 1. The gingivae adjacent to the well adapted and polished restorations and their margins with a level of gingival crest were grossly and histopathologically found no specific changes. 2. The gingive adjacent to the ill fitting and unpolished restorations and their margins with subgingival extension of 1 to 1.5mm were not grossly found any changes but hitopathologically, the inflammatory changes. 3. Thee wee no obvious difference in gingival response among the various alloys in histopathological observation.

• The Journal of Korean Academy of Prosthodontics
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• v.29 no.2
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• pp.177-194
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• 1991

The purpose of this study was to analyze the magnitude and distribution of stress using a photoelastic model from a distal extension removable partial dentures with three kinds of mandibular major connectors, that is, lingual bar, linguoplate, and swing-lock attachment. A photoelastic model was made of the epoxy resin(PC-1) and hardener(PCH-1) and coated with plastic cement-1 (PC-1) at the lingual surface of the epoxy model and set with three kinds of chrome-cobalt removable partial dentures. A bilateral vertical load of 15kg to the middle portion of the metal bar crossing both the first molars of the right and the left, and a unilateral vertical load of 12.5kg to the right first molar were applied with the use of specially designed loading device and the reflective circular polariscope was used to analyze the photoelastic model under each condition. The following results were obtained : 1. When the bilateral vertical load was applied, the magnitude and distribution of the stress concentration of the edentulous area and the terminal abutment or adjacent teeth was in the order of lingual bar, linguoplate, swing-lock attachment. 2. When the unilateral vertical load was applied, the magnitude and distribution of the stress concentration of the edentulous area and the terminal abutment or adjacent teeth was in the order of lingual bar, linguoplate, swing-lock attachment. 3. When the unilateral vertical load was applied, the magnitude and distribution of the stress concentration of the termial abutment or adjacent teeth on the non-loaded side showed the least stress distribution in case of swing-lock attachment. 4. When the bilateral vertical load and the unilateral vertical load were applied the swing-lock attachment showed the mildest uniform stress distribution on the edentulous area and the alveolar bone around the abutment teeth.

• The Journal of Korean Academy of Prosthodontics
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• v.28 no.2
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• pp.183-197
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• 1990

The purpose of this study was to analyse the magnitude and distribution of stresses using a Photoelastic model from and distal - extension removable partial dentures With four designed indirect retainers. The designs of the indirect retainers were as follows : Design No. 1 : Aker's clasp on 1st bicuspid with no indirect retainer. Design No. 2 : Aker's clasp on 1st bicuspid with indirect retainer on canine. Design No. 3 : Extension of the reciprocal arm of Aker's clasp toward incisal rest on canine. Design No. 4 : Connection with the indirect retainer as in No. 2 and extension of reciprocal arm of Aker' s clasp. A photoelastic model was made of the epoxy resin(PL - 1) and hardner(PLH - 1) and coated with plastic cement -1(PC -1) at the lingual surface of the epoxy model and set with chrome - cobalt partial dentures. A unilateral vertical load of 10kg to the right 1st molar and a vertical load of 10kg to the middle portion of the metal bar crossing both the 1st molars of the right and left, were applied. With the use of specially designed jig, fixture; loading device and the reflective circular polariscope, we obtained the following results : 1. When the unilateral vertical load and the vertical load of the middle portion of the metal bar were applied, design No. 2, 3 and 4 exhibited the higher stress concentration at the root apices and their surrounding tissues of the primary and secondary abutment teeth. 2. When the unilateral vertical load applied to design No. 2,3 and 4 the root apices of the primary and secondary abutment teeth and their surrounding tissues and the nonloaded side of edentulous area exhibited and even stress distribution. 3. When the vertical load was applied, the stress concentration fringe in the primary and secondary abutment teeth was in the order of No. 1,4,2 and 3. 4. No.1 and 4 exhibited the higher distrorted stress concentration at the primary teeth and the edentulous area in the nonloaded side. 5. No.2 design reduced the stresses at the apices of the alveoli of the primary abutment teeth bilaterally as well as on the crest of the residual ridge on the nonloaded side. 6. No. 2 design exhibited the most favorable stress distribution.

• Journal of the Korean Society for information Management
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• v.36 no.3
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• pp.149-174
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• 2019

This study analyzes the actual use data of the websites of university libraries, analyzes the users' usage behavior, and proposes improvement measures for the websites. The study analyzed users' traffic and analyzed their usage behavior from January 2018 to December 2018 on the C University website. The website's analysis tool used 'Google Analytics'. The web traffic variables were analyzed in five categories: user general characteristics, user environment analysis, visit analysis, inflow analysis, site analysis, and site analysis based on the metrics of sessions, users, page views, pages per session, average session time, and bounce rate. As a result, 1) In the analysis results of general characteristics of users, there was some access to the website not only in Korea but also in China. 2) In the user experience analysis, the main browser type appeared as Internet Explorer. The next place was Chrome, with a bounce rate of Safari, third and fourth, double that of the Explore or Chrome. In terms of screen resolution, 1920x1080 resolution accounted for the largest percentage, with access in a variety of other environments. 3) Direct inflow was the highest in the inflow media analysis. 4) The site analysis showed the most page views out of 4,534,084 pages, followed by the main page, followed by the lending/extension/history/booking page, the academic DB page, and the collection page.