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전병돈,주종현,정재훈,Jeon, Byung-Don,Joo, Jong-Hyun,Jeong, Jae-Hoon 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.2
In this paper, we measured the temperature-dependent electrical resistance of five kinds of conductive yarns for temperature-sensitive textiles. Conductive yarns for temperature-sensitive textiles are multilayered and contain copper filaments. Krifi Cu-1, 2, 3, 4, and 5 are composed of 2, 3, 4, 7, and 14 strands of the copper filament, respectively. Krifi Cu-3, 4, and 5 were covered with polyethylene terephthalate (PET) fiber for insulation. It was determined that the electrical resistance of Krifi Cu-1 and 2 increased by $40m{\Omega}$ and $27.1m{\Omega}$, respectively, with each $5^{\circ}C$ increase over the temperature range of $30-100^{\circ}C$. In addition, it was found that the temperature-dependent electrical resistance did not increase with increasing number of copper filaments. Temperature-sensitive textiles were manufactured by patterning two conductive yarns with high increment and determining the linearity of the temperature-dependent electrical resistance. For the temperature-sensitive textile patterned with Krifi Cu-2, the average electrical resistance was $71.4m{\Omega}$ but the electrical resistance was not linear with temperature. The temperature-sensitive textile patterned with Krifi Cu-2 showed an average electrical resistance of $68.6m{\Omega}$ and good linearity with temperature.
보간법과 개선된 JPEG 예측을 통한 스테가노그래픽 기법 연구
전병현,이길제,정기현,유기영,Jeon, Byoung-Hyun,Lee, Gil-Jae,Jung, Ki-Hyun,Yoo, Kee-Young 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.2
The previous steganographic methods by using the interpolation were difficult to estimate the distortion because the size of cover image is extended by interpolation algorithms. In this paper, to solve the problems of previous methods proposed the improved steganographic method based on the pixel replacement algorithms. In our method, we cannot extend a cover image, but also can estimate exactly the distortion of the stego-images. In the experimental results, the estimated distortion and embedding capacity of stego-image are shown on three pixel replacement methods.
통합의료병원의 환자 미충족 의료서비스 및 경영개선을 위한 IPA
정문주 ( Moon-joo Cheong ),전병현 ( Byeong-hyeon Jeon ),노세응 ( Se-eung Noh ) 대한통합의학회 2021 대한통합의학회지 Vol.9 No.1
Purpose : This study explores unmet medical services within a region for patients admitted to a single medical institution in one region and was to analyze the importance and satisfaction of hospital selection attributes. Through this, we tried to solve the unmet medical needs of patients and provide useful basic data in terms of hospital management in the region. Methods : It were collected to a total of 250 questionnaires for patients admitted to the regional integrative medical hospital. However, 232 samples were used for the final analysis, excluding 18 copies not reported in good faith. For the analysis, first, demographic frequency analysis of inpatients and inpatients was performed, and second, characteristics of patients, including frequent disease receiving treatment, were analyzed. Next, descriptive statistics analysis was conducted on unmet medical service intentions. In terms of hospital selection attribute, the items of continuity maintenance (I quadrant), priority visibility (II quadrant), low priority (III quadrant), and excessive effort (IV quadrant) were derived using the IPA (importance-performance analysis) matrix technique. Results : The derived results were classified by item and area. In the priority administration area, it was the reputation and recognition of medical institutions and the service area of medical institutions. In the case of items, there were 6 items including the importance of surgery and medical expenses, and diet at hospitalization. Conclusion : Thus a result of this study, resources are efficiently allocated to priority correction areas with high importance but low satisfaction and circulatory medical treatment is performed in the departments required by patients who use medical care and, various methods, such as preparing a policy to support medical expenses, should be sought.
Momentum crashes and the 52-week high
Suk-Joon Byun(변석준),Byoung-Hyun Jeon(전병현) 한국경영과학회 2016 한국경영과학회 학술대회논문집 Vol.2016 No.10
Despite their strong performance, momentum strategies suffer from occasional large drawdowns referred to as momentum crashes. In this paper we address the question of why momentum crashes by identifying its cross-sectional determinant: nearness to 52-week high. We provide robust empirical finding that stocks far from their 52-week highs outperform stocks near their 52-week highs during the momentum crash periods, and the momentum crash is just a manifestation of such outperformance. We consider several explanation for the outperformance and find that inflow of anchoring susceptible investors is the most consistent explanation. Furthermore, we provide a revised momentum strategy that is neutral on nearness to 52-week high. The strategy is free of crashes and exhibits a normal-like distribution without sacrificing its profitability.