• Journal of KIISE:Software and Applications
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• v.33 no.9
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• pp.776-786
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• 2006

This paper proposes XML based mobile information visualization system using rectangle layout to show effectively XML based information to user on mobile devices which do not have a rich display feature. We define XML schema that can describes information in graph with cycle as well as information in tree form. It suggests using rectangle layout method that is an improvement of the traditional method of the radial layout because the specificity of the mobile display should be considered when XML information is rendered on the screen. And then, it applies DOI of fisheye view algorithm to information on the rectangle layout to represent all and user interest information. And it also suggests an effective method considering capability of mobile devices to decrease user's confusion and improve awareness of user when a user Interest target selected. The proposed information visualization system in the form of focus+context supports an effective interface for information retrieval via mobile devices, such as PDA, cellular phone and smart phone, that usually have less power of CPU than that of PC and the constraints of display and memory. In this paper, it performs experiments and makes an evaluation comparing information visualization method between the traditional radial layout and the proposed rectangle layout.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.5
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• pp.225-230
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• 2015

In this paper, we propose an effective real-time visual loop closure detector, VILODE, which makes use of key frames and bag of visual words (BoW) based on SURF feature points. In order to determine whether the camera has re-visited one of the previously visited places, a loop closure detector has to compare an incoming new image with all previous images collected at every visited place. As the camera passes through new places or locations, the amount of images to be compared continues growing. For this reason, it is difficult for a visual loop closure detector to meet both real-time constraint and high detection accuracy. To address the problem, the proposed system adopts an effective key frame selection strategy which selects and compares only distinct meaningful ones from continuously incoming images during navigation, and so it can reduce greatly image comparisons for loop detection. Moreover, in order to improve detection accuracy and efficiency, the system represents each key frame image as a bag of visual words, and maintains indexes for them using DBoW database system. The experiments with TUM benchmark datasets demonstrates high performance of the proposed visual loop closure detector.

• Annual Conference of KIPS
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• 2003.11c
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• pp.1851-1854
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• 2003

본 논문에서는 영상의 인증과 무결성을 위한 새로운 블록 연성 워터마킹을 제안한다. 원 영상의 인증과 무결성을 확인하기 위하여 이진로고 영상을 워터마크로 사용한다. 원 영상의 각 픽셀의 정보뿐만 아니라 해당 블록의 정보로 binary look-up table을 선택하여 워터마크 비츠를 삽입한다. 기존 방식의 문제점으로 제시된 공격[6,7]을 효율적으로 막으면서도 시각적으로 변조유무 및 픽셀단위 또는 블록단위로 변조위치를 감지할 수 있음을 보인다.

• The Transactions of the Korea Information Processing Society
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• v.7 no.2
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• pp.477-487
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• 2000

When volume data is visualized by the ray casting method, the color value of each pixel in the image is obtained by composing the color contributions of the sample points that lie on the ray cast from the pixel point. In most ray tracing methods including Levoy's classical method, the color composition is formulated as a summation of the color contributions of the discrete sample points. However, the more precise color composition is formulated as differential equations over the color contributions of the continuous sample points. The discrete formulation is used, because analytical solutions to the continuous formulations are hard to find. In this paper, however, we have discovered a semi-analytical solution to the continuous formulation of a typical ray tracing of volume data. We have applied both Levoy's method and ours to the same set of data, and compared the visual quality of both results. The comparison shows that our method produces a more fine-grained visualization of volume data.

• Journal of the Korean Institute of Telematics and Electronics
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• v.26 no.4
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• pp.98-105
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• 1989

Various models incorporating Human Visual System (HVS) with the Hadamard transform (HT) represented by Walsh functions are considered. Using the exact frequency components of HT basis functions, the optimum modulation transfer function (MTF) which has a higher peak frequency than DCT schemes is obtimum modulation transfer function (MTF) which has a higher peak frequency than DCT schemes is obtained analytically and visually. The main criterion, for error measurement, is errors at the block boundaries which is an important factor in transform coding. The scheme which has no inverse HVS is proposed. It causes some degradation of image data but it is insignigicant. Crossing area of 4 blocks is equalized by the HVS weighting coefficients. The HVS weighted coding results in perceptually higher quality images compared with the unweighted scheme.

• KIPS Transactions on Software and Data Engineering
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• v.12 no.9
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• pp.407-418
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• 2023

The Multi-Object Goal Visual Navigation(MultiOn) is a visual navigation task in which an agent must visit to multiple object goals in an unknown indoor environment in a given order. Existing models for the MultiOn task suffer from the limitation that they cannot utilize an integrated view of multimodal context because use only a unimodal context map. To overcome this limitation, in this paper, we propose a novel deep neural network-based agent model for MultiOn task. The proposed model, MCFMO, uses a multimodal context map, containing visual appearance features, semantic features of environmental objects, and goal object features. Moreover, the proposed model effectively fuses these three heterogeneous features into a global multimodal context map by using a point-wise convolutional neural network module. Lastly, the proposed model adopts an auxiliary task learning module to predict the observation status, goal direction and the goal distance, which can guide to learn the navigational policy efficiently. Conducting various quantitative and qualitative experiments using the Habitat-Matterport3D simulation environment and scene dataset, we demonstrate the superiority of the proposed model.

• Annual Conference of KIPS
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• 2019.10a
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• pp.372-374
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• 2019

기계를 잘 다루지 못하는 사람들은 스마트폰을 활용할 때 어려움을 겪는다. 따라서 기계에 서툰 사람뿐 아니라 날씨를 확인하기 힘든 바쁜 현대인들이 날씨를 시각적으로 좀 더 쉽게 확인하고, 필요한 용품을 미리 챙겨서 날씨에 대비할 수 있도록 한다. 그뿐만 아니라 사계절이 없는 나라의 사람들에게 다양한 계절을 경험할 수 있게 해준다. 터치스크린을 이용해서 사용자가 원하는 나라를 선택하면 날씨 정보가 화면에 나타나고, 날씨 박스에도 시각적으로 표현이 된다. 날씨 박스로는 인형 소품을 이용해 계절을 알려주고, 조명을 이용해서 황사, 미세먼지 그리고 낮과 밤을 나타내고, 효과음을 이용해서 비 또는 천둥을 표현한다.

• Annual Conference of KIPS
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• 2023.11a
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• pp.1202-1203
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• 2023

본 논문은 스팀(Steam) 게임 플랫폼을 기반으로 약 1000개의 게임 데이터를 활용하여 사용자들에게 알맞은 게임을 추천해주는 시스템을 제안한다. 게임 선택에 영향을 주는 요인들을 언어 객체로 설정하여 규칙 기반 추론 시스템을 구현했다. 선호도 정보는 게임 선택의 기준이 되는 세 가지 요소에 대한 질문에 답하는 방식으로 수집된다. 게임 추천 결과를 시각화하여 신규 유저를 게임에 유입하고 몰입을 촉진하고자 한다.

• 한국공간정보시스템학회:학술대회논문집
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• 2005.05a
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• pp.407-412
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• 2005

본 연구에서는 노선선정 시 요구되고 있는 방대한 자료와 결정요소 등을 선택하여 의사결정체계인 계층분석과정을 이용하여 합리적인 노선선정의 방법을 제시하고 이를 평가하고자 하며, 이렇게 수행된 노선선정 결과를 지혈공간정보체계를 이용하여 시각화 및 분석하고자 한다. 구체적인 적용방법은 계층분석과정으로 선정된 평면선형을 분석하고 그것을 기반으로 종단선형의 설계를 종단경사 변화에 의한 다각적인 방법으로 분석하여 합리적인 노선선정을 도출하여 평가하고자 한다.

• The Journal of the Korea Contents Association
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• v.13 no.8
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• pp.83-92
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• 2013

Text visualization begins with understanding text itself which is material of visual expression. To visualize any text data, sufficient understanding about characteristics of the text first and the expressive approaches can be decided depending on the derived unique characteristics of the text. In this research we aimed to establish theoretical foundation about the approaches for text visualization by diverse examples of text visualization which are derived through the various characteristics of the text. To do this, we chose the 'Bible' text which is well known globally and digital data of it can be accessed easily and thus diverse text visualization examples exist and analyzed the examples of the bible text visualization. We derived the unique characteristics of text-content, structure, quotation- as criteria for analyzing and supported validity of analysis by adopting at least 2-3 examples for each criterion. In the result, we can comprehend that the goals and expressive approaches are decided depending on the unique characteristics of the Bible text. We expect to build theoretical method for choosing the materials and approaches by analyzing more diverse examples with various point of views on the basis of this research.