• Review of KIISC
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• v.9 no.3
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• pp.31-42
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• 1999

인터넷상에서 안전한 전자상거래를 영위하기 위하여 필수적인 전자서명용 인증서 발급 서비스 체계에 대하여 설명한다. 우선 인증서 발급서비스를 하기 위하여 필요한 망 구 조와 등록관리시스템 전자서명생성키 생성 및 관리 시스템 인증서 생성 및 관리 시스템 디 렉토리 시스템 시점확인 시스템 웹서비스 시스템 및 보안 설비들의 기능을 서술하고 이러한 시스템들을 이용한 인증서 발급업무의 흐름을 세가지 유형으로 분리설명한다., 또한 이증서 갱신 폐지 정지등에 대해서도 언급하며 끝으로 한국정보인증이 인증서비스를 바탕으로 향후 에 제공할 서비스에 대해 소개한다.

• Journal of Korea Multimedia Society
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• v.16 no.4
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• pp.483-492
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• 2013

SURF is an algorithm which extracts feature points and generates their descriptors from input images, and it is being used for many applications such as object recognition, tracking, and constructing panorama pictures. Although SURF is known to be robust to changes of scale, rotation, and view points, it is hard to implement it in real time due to its complex and repetitive computations. Using 3.3 GHz Pentium, in our experiment, it takes 240ms to extract feature points and create descriptors in a VGA image containing about 1,000 feature points, which means that software implementation cannot meet the real time requirement, especially in embedded systems. In this paper, we present a hardware architecture that can compute the SURF algorithm very fast while consuming minimum hardware resources. Two key concepts of our architecture are parallelism (for repetitive computations) and efficient line memory usage (obtained by analyzing memory access patterns). As a result of FPGA synthesis using Xilinx Virtex5LX330, it occupies 101,348 LUTs and 1,367 KB on-chip memory, giving performance of 30 frames per second at 100 MHz clock.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.46 no.4
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• pp.116-123
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• 2009

Feature point matching, which is finding the corresponding points from two images with different viewpoint, has been used in various vision-based applications and the demand for the real-time operation of the matching is increasing these days. This paper presents a real-time feature point matching method by using a local descriptor derived by Zernike moments. From an input image, we find a set of feature points by using an existing fast corner detection algorithm and compute a local descriptor derived by Zernike moments at each feature point. The local descriptor based on Zernike moments represents the properties of the image patch around the feature points efficiently and is robust to rotation and illumination changes. In order to speed up the computation of Zernike moments, we compute the Zernike basis functions with fixed size in advance and store them in lookup tables. The initial matching results are acquired by an Approximate Nearest Neighbor (ANN) method and false matchings are eliminated by a RANSAC algorithm. In the experiments we confirmed that the proposed method matches the feature points in images with various transformations in real-time and outperforms existing methods.

• Journal of Korea Entertainment Industry Association
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• v.13 no.8
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• pp.209-221
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• 2019

A found-footage film La France est notre patrie is a documentary, in which archive images are juxtaposed with intertitles, non-diegetic music and foley, by borrowing an audiovisual strategy of silent films. The filmmaker Rithy Panh has excavated the images, which had been taken during the same period as the film history of the end of the 19^th and early 20^th centuries in Southeast Asia and Africa under French colonial rule. This paper examines the filmmaker's methods of historiography when utilizing archive images in order to represent the past by referring to Walter Benjamin's concept of historical montage and dialectical image. As the analysis illustrates the singularity of constructive methods, which include multi-layer viewpoints and montage styles of compilation and collage, it reveals how La France est notre patrie elicits the essay film modes through its self-reflexivity, leads audience to the threshold of critical thinking about time and history and creates a discourse of counter-memory.

• Journal of Hospice and Palliative Care
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• v.19 no.1
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• pp.26-33
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• 2016

Purpose: This study was conducted to identify clinical characteristics of oncologic patients at a point when they signed their do-not-resuscitate (DNR) orders. Methods: From January through December 2014, we retrospectively analyzed the records of 197 patients who passed away after agreeing to a DNR order in the hemato-oncology department of a tertiary hospital. Results: Of all, 121 patients (61.4%) were male and 76 (38.6%) were female, and their average age was 58.7 years. Ninety-four patients (47.7%) had gastrointestinal cancer. The ECOG performance status at admission was grade 3 in 76 patients (36.5%) and grade 4 in 11 (5.6%). The patients' mean hospital stay was 20 days. The mean duration from the admission to DNR decision was 13 days, and the mean duration from DNR decision to death was seven days. Conclusion: Study results indicate that a decision on signing or refusing a DNR order was made by medical staff mostly based on the opinions of patients' guardians rather than the patients themselves. This suggests that patients' own wishes are not well respected. Thus, it is urgent to establish institutional devices to enhance cancer patients' autonomy regarding DNR and to define an adequate timing for withdrawal of treatments.

• Electronics and Telecommunications Trends
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• v.18 no.2 s.80
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• pp.79-88
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• 2003

무선인터넷 서비스는 이동통신 사업자들에게 강력한 추가수익원으로 떠오르고 있으며, 활성화를 위하여 장기적이고 효율적인 정책대안 수립이 절실한 시점이다. 본 연구에서는 무선인터넷 산업의 현실을 올바로 파악하고자 하는 노력의 일환으로 무선인터넷 사용자들에 대하여 설문조사를 수행하였으며, 그 결과를 무선인터넷 이용환경, 이용실태, 평가 등 세 부분으로 나누어 서술하였다. 무선인터넷은 엔터테인먼트용 콘텐츠의 이용도가 높아 여가생활에 도움을 주고 있지만, 실생활에는 아직 큰 도움이 되지 못한다는 평가를 얻었다. 그리고 통신요금에 대한 불만이 가장 높은 것으로 나타나, 무선인터넷 서비스 확산에 큰 장애요인으로 떠올랐다. 그리고 정액제에 대한 높은 선호를 확인함으로써 통신요금 체계도 무선인터넷 확산에 걸림돌이 되고 있는 것으로 판단하였다. 한편 본 조사에서는 전자우편의 이용횟수, 무선인터넷 및 음성통화의 하루평균 이용시간, 통신요금 및 정보이용료 지출액 등에서 여성의 활용도가 활발한 것으로 나타나 이동통신 서비스 확산에서 여성의 역할이 부각되었다. 결론적으로 우리나라는 무선인터넷 서비스 확산을 위한 하드웨어적인 준비는 거의 완료되었으나 요금수준 및 체계, 통신품질, 콘텐츠 등 소프트웨어 측면에서의 준비는 다소 미비한 것으로 판단되며, 해당 분야에 대한 집중적인 연구와 투자가 필요한 시점으로 생각된다.

• Journal of Korea Game Society
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• v.10 no.3
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• pp.37-45
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• 2010

This study examines the characteristics of screen image of 3D first-person shooting games and the newly created subjectivity by that image. 3D first-person shooting games create immersion by remediating the visual experience in the real world. The construction of subjective perspectives and comparatively clear interface are the important features of 3D first-person shooting games. The subjectivity created by this games' image is different from the subjectivity constructed by suture of film. Gamers have the dominant position of the subject of looking, gaming and narrating, but the narrating position is never permanent nor stable. Because the position has the limited sight of first-person, not the comprehensive sight of third-person.

• Cartoon and Animation Studies
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• s.28
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• pp.181-208
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• 2012

Illusion played by mutual communication in Interactive Media Art is studied in this thesis from the narrative point of view, not from the entertaining point of view. Microscopic narrations founded in screen changes are analyzed by traditional narrative factors such as plot, point of view, narration, time creating the identity of Interactive Media Art. Traditional narrative factors in consequence have been converted to different forms after being combined with the features of Interactive Media Art. Plot has been converted to fragmentary plot and creators' point of view in many work pieces has been recreated to the outside participants' point of view. Also, creators' narrations described from various points of view has transferred to participants' narrations based on physically spacious search. Times of the present sharing with the past are observed in Interactive Media Art, too. It is concluded that audience's active participation through mutual communication makes an influence on the change of essentially traditional narrative factors. Moreover, the factors mentioned in this thesis are regarded as the unique identity of out of various kinds of modern media art.

• Journal of the Korea Convergence Society
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• v.8 no.11
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• pp.133-139
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• 2017

Objective: The purpose of this study was to examine levels of awareness, attitude and practice of wearing seatbelt of university students using a long distance commute. Methods: A cross-sectional survey design was used to investigate a convenience sample of 118 university students in Chungbuk province. Data was analyzed by descriptive statistics, Pearson correlation coefficients, t-test, ANOVA and Scheffe'test using SPSS version 22. Results: A significant positive correlation was found among awareness, attitude and practice. There were statistically significant differences in awareness, attitude and practice according to some of general characteristics(gender, age, commuting time, the last point of no seatbelt, socioeconomic status). Conclusion: Based on the results of this study, it can be used to develop an accident prevention and health education program.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.37 no.3
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• pp.109-118
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• 2019

Road information is one of the most significant geospatial data for applications such as transportation, city planning, map generation, LBS (Location-Based Service), and GIS (Geographic Information System) database updates. Robust technologies to acquire and update accurate road information can contribute significantly to geospatial industries. In this study, we analyze the limitations of ACO (Ant Colony Optimization) road extraction, which is a recently introduced object-based road extraction method using high-resolution satellite images. Object-based ACO road extraction can efficiently extract road areas using both spectral and morphological information. This method, however, is highly dependent on object descriptor information and requires manual designations of descriptors. Moreover, reasonable iteration closing point needs to be specified. In this study, we perform improved ACO road extraction on VHR (Very High Resolution) optical satellite image by proposing an optimization stopping criteria and descriptors that complements the limitations of the existing method. The proposed method revealed 52.51% completeness, 6.12% correctness, and a 51.53% quality improvement over the existing algorithm.