• ETRI Journal
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• v.41 no.3
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• pp.277-288
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• 2019

VWorld is run by the Ministry of Land, Infrastructure, and Transport of South Korea and provides national spatial information, such as aerial images, digital elevation models, and 3D structural models. We propose herein an open platform for 3D spatial information based on WebGL using spatial information from VWorld. WebGL is a web-based graphics library and has the advantage of being compatible with various web browsers. Our open platform is also compatible with various web browsers. Accordingly, it is easily accessible via the VWorld site and uses the three-dimensional (3D) map program. In this study, we describe the proposed platform configuration, and the requests, management, and visualization approaches for VWorld spatial information data. Our aim is to establish an approach that will provide a stable rendering speed even on a low-end personal computer without a graphics processing unit based on a quadtree structure. We expect that users will be able to visualize 3D spatial information through the VWorld open platform, and that the proposed platform will become the basis for various applications.

• Journal of Information Processing Systems
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• v.15 no.4
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• pp.853-864
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• 2019

Microblogging services (such as Twitter) are the representative information communication networks during the Web 2.0 era, which have gained remarkable popularity. Weibo has become a popular platform for information dissemination in online social networks due to its large number of users. In this study, a microblog information dissemination model is presented. Related concepts are introduced and analyzed based on the dynamic model of infectious disease, and new influencing factors are proposed to improve the susceptible-infective-removal (SIR) information dissemination model. Correlation analysis is conducted on the existing information dissemination risk and the rumor dissemination model of microblog. In this study, web hyper is used to model rumor dissemination. Finally, the experimental results illustrate the effectiveness of the method in reducing the rumor dissemination of microblogs.

• The Journal of the Korea Contents Association
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• v.1 no.1
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• pp.15-23
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• 2001

It is difficult to figure out the specific contents of the buildings in the internet spatial area, since those data on the internet present only the location of buildings and the outlines of lands on which buildings are located, An experimental study for the view management of building information at internet urban spatial area was conducted on the Web-GIS based map using hyper map. With the building information on the 2-D map, modified from the previous numerical map and the regional building information and additional information, a new form of building through 3-D icons was shown on the internet spatial area. This study shows the Web-based building management system, which is designed to manage attribute data about hyper-linked buildings of 2.5-D icons and to reproduce visual building information by putting a variety of information into hyper-linked icons on the hyper map. This system not only complements the lack of consistency between real buildings and those on the map, but also provides users with more familiar urban space, so that everybody can utilize the building information as long as he has access to the internet.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.6
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• pp.635-642
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• 2000

In this paper, we proposed an efficient document conversion mechanism to provide a adaptive web document to mobile terminals. We also proposed a RHTML(Reduced HTML) to archive the adaptive tag reduction. Markup error correction process in the proposed adaptive document conversion mechanism converts a HTML(HyperText Markup Language) document into a XML(Extensible Markup Language) application document. This. process makes web document easy to handle with a DOM (Document Object Mode)) as the tree model and removes the hardware overhead in mobile terminals. Also, tag reduction process provides the adaptive web document with three DTD(Document Type Definition)s in the RHTML.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.4
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• pp.3-14
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• 2001

A Web server makes use of the HTTP(Hyper Text Transfer Protocol) to communicate with a client. The HTTP is a stateless protocol; the server does not maintain any state information for ongoing interactions with the client. Therefore, the HTTP inevitably requires additional overhead as repeating data key-in to user for continuing communications. This overhead in Web environment can be resolved by the cookie technologies. However, the cookie is usually unsecured due to the clear-text to transfer on the network and to store in the file. That is, information in the cookie is easy to exposure, copy, and even change. In this paper, we propose a secure cookie mechanism appropriate to Web environment, and then present a design and implement of secure Web system based on the scheme. The Web system can be used to any web environment. It also provides some security services, such as confidentiality, authentication, integrity.

• Electronics and Telecommunications Trends
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• v.12 no.4 s.46
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• pp.39-51
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• 1997

WWW(World Wide Web)은 인터넷상에 광범위하게 분산된 다양한 형식의 데이터를 손쉽게 검색할 수 있으며, 모든 응용의 사용자 환경을 손쉽게 포함시킴으로써 새로운 미디어 타입의 통합을 위한 가장 성공적인 기술로 평가받고 있다. 1990년 처음 개발될 당시 WWW은 텍스트 기반의 구조에 맞추어 HTTP(Hyper Text Transfer Protocol), HTML (Hyper Text Markup Language), URL(Uniform Resource Locator)이 제안되어, 이를 통해 비동기적인 형태의 검색과 상호작용을 지원하도록 설계되었다. 반면, 최근 인터넷상의 상당수를 차지하는 오디오, 비디오와 같은 실시간 환경의 멀티미디어 데이터들은 연속적, 동기적이며, 대화형 특징을 포함하고 있어 WWW에서 이러한 미디어들을 통합하기 위해서는 구조적인 확장이 요구된다. 본 고에서는 실시간 오디오/비디오를 웹상에서 통합시키기 위한 기술들은 분석한다. 인터넷 실시간 멀티미디어 데이터를 WWW에서 처리하기 위한 현재의 기술과 문제점들을 소개하고, 이를 해결하기 위해 WWW 기본 구조의 확장과 기술적인 해결책들을 제안한다.

• The Transactions of the Korea Information Processing Society
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• v.7 no.8S
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• pp.2713-2721
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• 2000

이 논문에서는 Web 사이트를 설계할 때 응답시간과 관련해서 고려되어야 할 요수 중[10,15,16], 인터넷 연결 회선의 대역폭 결정에 참조될 수 있는 자료를 제시한다. 이를 위해 다양한 환경에서 Web 세션 도착율에 따른 응답시간과 회선 이용율의 변화를 관찰하고, 이를 통해 특정 대역폭의 회선에 대해 Web 서비스가 한계 응답시간 내에 보장될 수 있는 Web 세션 도착율의 임계치를 구한다. [15,16]. 이 논문에서는 데이터 수집을 위해 실험 네트워크를 구성하고, 자체적으로 구현한 패킷 생성기를 이용하여 세션 도착율의 변화에 따른 Web 트래픽을 시뮬레이션한다. 응답시간은 패킷 생성기가 생성한 각각의 HTTP(Hyper-Text Transfer Protocol)요청 패킷이 전송되는 시점부터 HTTP응답 메시지가 도착하는 시점까지의 경과된 시간으로 구하고, 회선 이용율은 SNMP(Simple Network Management Protocol)를 이용해 자체 구현한 데이터 수집기로 구한다[3]. 이 실험의 결과는, Web 사이트를 설계할 때 네트워크 전문가가 아니더라도 인터넷 연결 회선의 대역폭 결정 문제를 해결하는데 쉽고 유용하게 참조될 수 있다.

• Journal of dental hygiene science
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• v.20 no.4
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• pp.206-212
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• 2020

Background: A Teachable Machine is a kind of machine learning web-based tool for general persons. In this paper, the feasibility of Google's Teachable Machine (ver. 2.0) was studied in the diagnosis of the tooth-marked tongue. Methods: For machine learning of tooth-marked tongue diagnosis, a total of 1,250 tongue images were used on Kaggle's web site. Ninety percent of the images were used for the training data set, and the remaining 10% were used for the test data set. Using Google's Teachable Machine (ver. 2.0), machine learning was performed using separated images. To optimize the machine learning parameters, I measured the diagnosis accuracies according to the value of epoch, batch size, and learning rate. After hyper-parameter tuning, the ROC (receiver operating characteristic) analysis method determined the sensitivity (true positive rate, TPR) and specificity (false positive rate, FPR) of the machine learning model to diagnose the tooth-marked tongue. Results: To evaluate the usefulness of the Teachable Machine in clinical application, I used 634 tooth-marked tongue images and 491 no-marked tongue images for machine learning. When the epoch, batch size, and learning rate as hyper-parameters were 75, 0.0001, and 128, respectively, the accuracy of the tooth-marked tongue's diagnosis was best. The accuracies for the tooth-marked tongue and the no-marked tongue were 92.1% and 72.6%, respectively. And, the sensitivity (TPR) and specificity (FPR) were 0.92 and 0.28, respectively. Conclusion: These results are more accurate than Li's experimental results calculated with convolution neural network. Google's Teachable Machines show good performance by hyper-parameters tuning in the diagnosis of the tooth-marked tongue. We confirmed that the tool is useful for several clinical applications.

• Journal of Korea Multimedia Society
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• v.19 no.5
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• pp.932-938
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• 2016

Recently, interactive media which maximizes audience engagement by making the audience appeal on a stage in digital media environment has been distributed more widely. In fact, there has been active movement to develop and promote a new participatory media genre with higher immersion by applying this kind of interactive media concept to advertisement, film, game and e-learning. In the conventional interactive media, digital media had to be enjoyed in particular environment where diverse sensors were installed or through a certain device to recognize a user's motion and voice. This study attempted to design and implement an image creation system which ensures interactions between a user and media in popular distribution-enabled web environment and through PC and smart devices to minimize the image producer-user constraints.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.667-669
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• 1998

그래프 드로잉 시스템이란 주어진 그래프에 대하여 그 그래프가 가진 어떤 특성을 가시화하여 그래픽하게 표현해 주는 소프트웨어 시스템을 말한다. 본 논문에서는 Java를 사용하여 WWW(World Wide Web) 상에서의 상호연결망 그래프의 대칭적 드로잉을 수행하는 그래프 드로잉 시스템을 소개한다. 이 시스템을 Ring, HyperCube, Butterfly와 같은 대표적인 상호연결망 그래프에 대한 기존의 드로잉과 대칭성을 잘 나타내 주는 드로잉을 동시에 보여주며, 또한 HyperCube, HyperTree, Pyramid와 같이 그 모양을 입체적으로 나타낼 수 있는 그래프에 대해서는 원근법을 사용한 3차원 드로잉을 하고 X,Y,Z 축에 따라 이를 회전시켜 그래프에 대한 이해도를 높였다.