• The Transactions of the Korea Information Processing Society
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• 제7권8호
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• pp.2555-2564
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• 2000

In this paper, a new unsupervised image segmentation algorithm is proposed. To model the contextual information presented in images, the characteristics of the Markov random fields (MRF) are utilized. Textured images are modeled as realizations of the stationary Gaussian MRF on a two-dimensional square lattice using the conditional autoregressive (CAR) equations with a second-order noncausal neighborhood. To detect boundaries, hypothesis tests over two masked areas are performed. Under the hypothesis, masked areas are assumed to belong to the same class of textures and CAR equation parameters are estimated in a minimum-mean-square-error (MMSE) sense. If the hypothesis is rejected, a measure of dissimilarity between two areas is accumulated on the rejected area. This approach produces potential edge maps. Using these maps, boundary detection can be performed, which resulting no micro edges. The performance of the proposed algorithm is evaluated by some experiments using real images as weB as synthetic ones. The experiments demonstrate that the proposed algorithm can produce satisfactorY segmentation without any a priori information.

• Journal of the Mineralogical Society of Korea
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• 제23권3호
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• pp.211-217
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• 2010

A micro-focus X-ray computed tomography (CT) was employed to determine quantitative phase analysis of skarn Zn-Pb-Cu ore by nondestructive visualization of the internal mineral distribution of a skarn ore. The micro CT images of the ore were calibrated to remove beam hardening artifacts, and compared with its scanning electron microscope (SEM) images to set the threshold of CT number range covering sulfide ore minerals. The volume ratio of sulfide and gangue minerals was calculated 20.5% and 79.5%, respectively. The quantitative 3D X-ray CT could be applied to analyse the distribution of economic minerals and their recovery.

• The Journal of the Korea Contents Association
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• 제21권7호
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• pp.440-447
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• 2021

The purpose of this study is to verify the effectiveness of non-face-to-face lectures conducted at universities in Korea under the influence of COVID-19. So this study analyzed the satisfaction level of the students according to the type of class operation, such as face-to-face classes and remote video classes. To this end, this study compared the differences in class satisfaction by class type and class size for a total of 8,707 courses operated by a university between 2019 and 2020. The study found that the satisfaction level of the remote video class was significantly high. In addition, the combination of remote video classes and face-to-face was more satisfactory than other cases. On the other hand, the satisfaction level of small classes in both face-to-face and remote video classes was higher than that of medium or large classes. This means that even remote video classes are highly satisfactory in small-scale classes. Based on the findings, the study proposes a paradigm for new college classes.

• Journal of the Korean Burn Society
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• 제23권1호
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• pp.25-29
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• 2020

This paper presents our clinical experiences for reconstruction of the linear depressed postburn scar band by rhombus subcutaneous pedicle skin flap (RSPF). We report new RSPF, it's versatility, and effectiveness for correction of the mild to moderate linear depressed postburn scar band. To correct the postburn scar band, we have newly designed the Rhombus Subcutaneous Pedicle Skin Flap (RSPF), which is made as rhombus-shaped skin flap on the inside of scar band. After excision of burn scar band, the each vertex of RSPF flap is advanced into the skin defects at apex of extended skin incision, which is starting from the upper and lower portion of the removed burn scar band at a near right angle. This flap can add more extra skin to adjacent superior and inferior area of excised scar band. We have experienced 2 cases of RSPF for reconstruction of linear depressed postburn scar band deformities in lower extremity. After 3 weeks to 3 months postoperative follow ups, relatively satisfactory results were obtained in all cases. We had successfully reconstructed the linear depressed postburn scar postburn band of lower extremity using the rhombus subcutaneous pedicle skin flap. For the correction of mild to moderate sized linear depressed postburn scar band deformities in extremity, the RSPF is simple, and very effective without donor morbidity.

• The Journal of the Convergence on Culture Technology
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• 제8권6호
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• pp.67-77
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• 2022

The purpose of this study was to explore the experiences of counselors who conducted video counseling using digital mask. To this end, the contents of the focus group interview with four counselors who experienced mask video counseling for a total of 10 Korean college student clients were analyzed using thematic analysis method. Participant counselors reported that they had been concerned about mask video counseling before the start but gradually be adjusted to the method. Since they have observed the rapid self-disclosure of the clients and smooth counseling process, they positively predicted the possibility of digital masks as a therapeutic media. They also mentioned the need for additional education and training for the counselors who are using the new on-line counseling media. Therefore, various supports for proactive responses of counselors to online counseling media need to be explored.

• Journal of Platform Technology
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• 제11권1호
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• pp.11-22
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• 2023

Various video conferencing and collaboration applications have emerged due to the global epidemic of new viral infections. In addition to real-time video conferencing, video conferencing applications provide features such as chat and file sharing on various platforms. Because various personal information is stored through functions such as chatting, file and screen sharing, these video conferencing applications are the major target of analysis from a digital forensic investigation. In the case of applications that provide cross-platform, the form of stored data is different depending on the platform. Therefore, to utilize data of video conferencing application for forensic investigation, preliminary research on artifacts stored by platform is required. In this paper, we used the video conferencing applications GoToWebinar and GoToMeeting and analyzed the artifacts generated. As a result, we list the main data from a digital forensic investigation. We identify data stored for each platform provided by GoToWebinar and GoToMeeting and organize artifacts that can estimate user behavior. Also, we classify the data that can be acquired according to the role and environment within the video conference.

• The Korean Nurse
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• 제7권6호통권38호
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• pp.70-73
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• 1968

심한 화상환자를 치료하는 동안이나 피부이식을 하는 동안에 어떻게하면 환자를 따뜻하고 안전하게 보호할 수 있을까? 사용할 용액들, 홑이불, 수술대, 회복실 침대를 따뜻하게 준비해 놓고 에어컨을 끈다. 너풀거리는 꺼즈를 잘 다듬어 놓고 stockinette도 준비한다. 피부이식을 위하여 피부를 떼어낸 부위에도 화상부위와 마찬가지로 질산은 드레싱을 하며 피부에 식염수나 기름종류는 사용하지 말아야 한다.

• Proceedings of the Korea Multimedia Society Conference
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• 한국멀티미디어학회 1998년도 춘계학술발표논문집
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• pp.210-215
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• 1998

암호 통신의 한 방법으로 표면상의 의미 있는 형태를 유지하지만 실은 그 속에 중요한 기밀 정보를 숨겨놓은 심층암호(steganography)가 주목되고 있으며, 특히 디지털 화상을 이용하는 화상 심층암호는 저작권 보호 수단으로 활용되고 있다. 본 논문은 농담화상을 오차 확산법을 이용하여 흑·백의 2치로 의사적으로 표시하면서 기밀 정보를 합성하는 새로운 방식을 제안한다.

• Electronics and Telecommunications Trends
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• 제10권1호통권35호
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• pp.33-37
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• 1995

팩시밀리 서비스품질 항목에 대하여 살펴보고, 그 중 하나인 화상품질의 사용자평가에 대한 분석방법에 관하여 논하고자 한다. 화상품질의 평가에는 사용자의 주관이 작용하는데 이것을 어떻게 객관적인 항목으로 바꾸는가 하는 것이 주요연구주제이다. 여기서는 사용자의 화상품질에 대한 평가로 통신망에 대해 평가하는 방법을 제안하였다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 한국퍼지및지능시스템학회 1998년도 추계학술대회 학술발표 논문집
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• pp.296-299
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• 1998

본 논문은 화상처리에 다치를 이용하여 농도처리하는 방법을 제안한다. 화상처리시에 필요한 물체의 농도를 다치로 표현한 후 그 특징을 추출하고, 원영상에 대한 주요 모양 특징들을 구한다. 그리고 다치 신경망을 이용하여 학습을 시킨 후 인식하려고 하는 영상에 대한 정보의 중복성과 인식에 필요한 시간 및 기억공간을 최소화 할 수 있다.