• Journal of KIISE:Computing Practices and Letters
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• v.15 no.6
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• pp.405-413
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• 2009

Tagging system is the system that allows internet users to assign new meta-data which is called tag to article, photo, video and etc. for facilitating searching and browsing of web contents. Tag cloud, a visual interface is widely used for browsing tag space. Tag cloud selects the tags with the highest frequency and presents them alphabetically with font size reflecting their popularity. However the conventional tag selection method includes known weaknesses. So, we propose a novel tag selection method Freshness, which helps to find fresh web contents. Freshness is the mean value of Kullback-Leibler divergences between each consecutive change of tag co-occurrence probability distribution. We collected tag data from three web sites, Allblog, Eolin and Technorati and constructed the system, 'Fresh Tag Cloud' which collects tag data and creates our tag cloud. Comparing the experimental results between Fresh Tag Cloud and the conventional one with data from Allblog, our one shows 87.5% less overlapping average, which means Fresh Tag Cloud outperforms the conventional tag cloud.

• The Transactions of the Korea Information Processing Society
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• v.7 no.8
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• pp.2349-2360
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• 2000

In medical image processing, if new technologies arc developed, they arc applied to real clinical cases. The results are to be analyzed by doctors to improve the new technologies. So, it is important for doctors to have a tool that helps the doctors in applying the new technologies to clinical cases and analyzing the clinical results. In this paper, we design and implement a visual programming environment where non-programming experts, such as medical doctors, can easily compose a medical image processing application program. A set of image processing functions are implemented and represented as icons. Thc user selects functions by clicking correslxmding icons. The users can easily find necessary' functions from the visualized library. A user selects a function from the visualized library and [Jut the function node into a canvas of Visual Programming Interface. The user connects nodes to compose a dataflow diagram. The connected dataflow diagram shows the now of the program. Hyperbolic Tree is helpful in visualizing a set of function icons in a single screen because it provides both the whole stmcture of the function Iihrary and the details of the focused functions at the same time. We also developed a CUI builder where the user interfaces of the medical image processing applications are composed. Therefore. non'programming experts such as physicians can apply new medical image processing algorithms to clinical cases without performing complex computer programming procedures.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06b
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• pp.346-348
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• 2006

기존의 웹 이미지 검색 시스템들은 웹 페이지에 포함된 텍스트들의 출현빈도, 태그유형 등을 고려해 각 키워드들의 중요도를 평가하고 이를 이용해 이미지의 캡션을 결정한다. 하지만 텍스트 정보만으로 캡션을 결정할 경우, 키워드와 이미지 사이의 관련성을 평가할 수 없어 부적절한 캡션의 배제가 어렵고, 사람의 인지와 맞지 않는 캡션이 추출되는 문제점이 있다. 본 논문에서는 기존의 웹 이미지 마이닝 방법을 통해 웹 페이지로부터 캡션 후보 키워드를 추출하고, 자동 이미지 주석 방법을 통해 이미지의 개념 부류 키워드를 결정한 후, 두 종류의 키워드를 결할하여 캡션을 선택한다. 가능한 결합 방법으로는 키워드 병합 방법, 공통 키워드 추출 방법, 개념 부류 필터링 방범 캡션 후보 필터링 방법 등이 있다. 실험에 의하면 키워드 병합 방법은 높은 재현율을 가져 이미지에 대한 다양한 주석이 가능하고 공통 키워드 추출 방법과 개넘 부류 키워드 필터링 방법은 정확률이 높아 이미지에 대한 정확한 기술이 가능하다. 특히, 캡션 후보 키워드 필터링 방법은 기존의 방법에 비해 우수한 재현율과 정확률을 가지므로 기존의 방법에 비해 적은 개수의 캡션으로도 이미지를 정확하게 기술할 수 있으며 일반적인 웹 이미지 검색 시스템에 적용할 경우 효과적인 방법이다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.12
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• pp.2933-2942
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• 2015

This paper proposes a new method which traces significant element of 2-dimensional natural images and encrypts them by using Fresnelet transform (FRNLT). After analyzing property of the subbands obtained by the FRNLT, we estimated the information for ciphering 2D images. Considering FRNLT levels, energy of subbands, and visual effect, we estimated the optimized point for encryption. By selecting various levels and encrypting region, we can encrypt 2D image with various robustness. Encryption effectiveness was showed by analyzing numerical result, executing time for encryption, area of encrypted region, and visual observation. Therefore encryption for various application can be applied by using the suggested parameters without additional analysis. Identifying the experimental result, in the case of $L_{TH}=4$ and $L_{TH}=4$, an image was not recognized through encrypting only 0.42% among the entire data.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.5
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• pp.919-930
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• 2000

This paper treats a development of visual interactive modeling(VIM) system for ship scheduling problem in integer formulation. The ship scheduling problem can be described as "A problem which assigns ships and cargos to achieve maximum revenue from transportation" in brief. Since late 1970s there has been rapid growth in development and use of VIM as MS10R technology due to the development of computer technology and now VIM has become a important discipline in MS/OR and MIS society. Visual Interactive Modeling is a process that decision maker takes part in modeling life cycle -data collection, formulation, derivation of optimal solution and representation of solution - and interacts with a modeling system to achieve a user-solution appropriate for his/her ultimate goal. This paper suggests the methodology how to collect data, build and modify model, and represent solution using computer graphics as a major driving tool and demonstrates effective performance of a prototype system.pe system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.1A
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• pp.89-97
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• 2002

This paper proposes the adaptive digital watermarking method for the ownership protection of images. The watermarks are inserted to a selected area rather than a whole area. The proposed method reduces the distortion caused by the watermarking process. To select the regions, roughness of the image should be considered because the watermarks in the smooth regions are easily detected through the human eyes. To find the rough regions, Discrete Cosine Transform (DCT) method is used. Generally, the high frequency regions of images are lost by the compression process such as JPEG. So, the watermarks are inserted to the low frequency regions of a selected area by using the proposed method. The proposed method reduce the image loss or distortion brought by the image processing, such as compression, filtering, scaling, addition of noise, cropping, and wavelet transform.

• Smart Media Journal
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• v.5 no.1
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• pp.104-113
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• 2016

A new design method for multi-functional pull-down menu based on stacking rules is proposed. The importance of a design point of view has been emphasized in many previous studies on web navigation. Taking technical aspects with an emphasis on programming techniques into consideration in this paper, multiple elements, which are used for constructing main menu of the pull-down menu, are capable of performing their unique functions independently in addition to basic classification function by disposing them to separated layers using stacking rules. Furthermore, the improvement of visual effects and efficiency for information navigation can be expected by implementing submenu selection-bar using animation techniques and function to automatically search submenu item. Finally, the effectiveness of the proposed method is identified by implementing multi-functional pull-down menu using CSS and jQuery.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.192-195
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• 2010

영상 정보의 정확성을 필요로 하는 다양한 서비스 및 여러 학문 분야의 적용성으로 인해 물리적인 한계성을 극복할 수 있는 고해상도 영상처리 기법의 요구가 대두되고 있다 뿐만 아니라, 인터넷 상의 디지털 콘텐츠 중의 하나인 동영상 UCC의 제작환경이 보편화됨으로써 비전문적인 제작으로 인한 다양한 형태의 해상도 저하 및 영상의 왜곡 현상이 발생하여 고품질의 영상을 추구하는 사용자들의 요구를 충족시키지 못하고 있다. 이러한 문제점을 해결하기 위한 압축 동영상의 개선 된 영상 정보를 획득하기 위한 연구가 이루어지고 있지만 다음과 같은 문제점이 있다. 기존의 방법은 일반적으로 저역 통과 필터 기법과 정규화 영상 복원 방식으로 구분되어 연구되고 있으며, 저역 통과 기법은 계산량 측면에서 장점이 있으나, 영상과 양자화 정도에 따라 적응적이지 못한 단점이 있다. 또한 정규화 복원 방식은 압축 영상의 시각적으로 불편한 현상의 완화 정도를 결정하는 정규화 매개변수를 일괄적으로 모든 화소에 적용해, 화소의 위치에 대한 적응도가 낮고 정규화 매개 변수 선택 시 원 영상에 대한 정보를 알고 있다는 가정을 사용했으므로 실제 사용이 불가능하며, 영상들 사이의 불균일로 인해 적응적으로 처리하지 못하는 단점이 있다. 본 연구에서는 이러한 문제점을 극복할 수 있도록 압축 정보 활용을 통한 POCS 방식을 사용한 coding artifact 제거 방식에 대해 기술한다.

• Journal of the Korea Society of Computer and Information
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• v.10 no.5 s.37
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• pp.103-108
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• 2005

In this Paper, we proposed a novel robust watermarking technique using PIM and 2D barcode for the copyright of the digital images. Because human is impervious to the change in the complex area, the embedding watermark to the selected coefficients using PIM enhances invisibility. A 2D barcode image is used for watermark in this research. The 2D barcode contains more information than conventional ID barcode and includes the error correction algorithm. Therefore the watermarking algorithm using 2D barcode enhances the robustness of watermark. From the experimental results , the proposed algorithm shows better invisibility and robustness performance in a general signal Processing such as JPEG and SPIHT lossy compression.

• Information Systems Review
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• v.17 no.2
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• pp.29-48
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• 2015

This study proposes an integrated operational model of branches with customer center at stock brokerage firms and suggests ways to improve existing systems. This suggested integrated model of branches and customer centers can increase customer satisfaction and customer values for the specific services at each channel. This integrated model also enables customers to make transactions at a desired specific time, make it possible to inquire whatever the customer wished to ask, and select desired contact channels. In addition, the firms can bring in improved effectiveness of internal resources by integrating all the resources the firm has. Personal resources and system resources are distributed by the characteristics of channels that can be selected by the customers. Then agents also can provide more speedy and accurate responses to the engaged customer interactions matching to his/her job in charge. Also, the model makes it possible to collect the latest customer and transaction information at the moment of each interactions, by which the firm can provide customized services specifically tailed to each customers' preferences. However, systematic interactions between branches and customer center, and completed system should be equipped with in order to provide the highest quality services.