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Kwang-Hwan Kim,Yong-Ha Kim,Sang-Yoon Ahn,Chong Hyung Lee,Hye-Jeong Hwang,Moo-Sik Lee,Moon-Joon Kim,Park Arma,Moon-Sook Shim,Hyeon-Dong Song 보안공학연구지원센터 2014 International Journal of Bio-Science and Bio-Techn Vol.6 No.6
This study aims to identify the influencing factors on the preparation education for well-dying of university students. To this end, this study investigated the 162 medical science students who had attended the thanatology lecture at K-university in Daejeon Metropolitan city for 15 weeks from March 1 to August 31 2014 after excluding those non-respondents. As for the continuous variables, independent sample t-verification was performed. Also, multiple regression was conducted with the factors affecting educational contents as the dependent variables. As a result of conducting the thanatology lecture as a class of liberal studies for one semester, one lecture a week for 4 weeks to death preparation experts would be suitable(p<0.05) by making it as a regular class of university curriculum(p<0.001). Consequently, the education on death for undergraduate students of health and medical science department will lead to an increased need for understanding and death education on death by allowing them to look at their life and the phenomena related to death from the perspective of humanities and also the psychological and spiritual views. Moreover, it will be utilized as preliminary data for the development of death education program in addition to an improvement for the negative awareness of death among students.
A Geometric Compression Method Using Dominant Points for Transmission to LEO Satellites
Kwang Hee Ko,Hyo-Sung Ahn,Semyung Wang,Sujin Choi,Okchul Jung,Daewon Chung,Hyungjun Park 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4
In the operation of a low earth orbit satellite, a series of antenna commands are transmitted from a ground station to the satellite within a visibility window (i.e., the time period for which an antenna of the satellite is visible from the station) and executed to control the antenna. The window is a limited resource where all data transmission is carried out. Therefore, minimizing the transmission time for the antenna commands by reducing the data size is necessary in order to provide more time for the transmission of other data. In this paper, we propose a geometric compression method based on B-spline curve fitting using dominant points in order to compactly represent the antenna commands. We transform the problem of command size reduction into a geometric problem that is relatively easier to deal with. The command data are interpreted as points in a 2D space. The geometric properties of the data distribution are considered to determine the optimal parameters for a curve approximating the data with sufficient accuracy. Experimental results demonstrate that the proposed method is superior to conventional methods currently used in practice.
Ahn, Wook,Lim, Sung Nam,Lee, Dong Un,Kim, Kwang-Bum,Chen, Zhongwei,Yeon, Sun-Hwa The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.18
<▼1><P>A sulfur–MWCNT composite battery containing a protective layer based on a MMT-coated separator was examined for its electrochemical properties.</P></▼1><▼2><P>To improve the cycle life of Li–S rechargeable batteries, chemically dispersed nanocarbon materials are usually employed as adsorbents and conductive matrices for cathodic nano-sized sulfur materials. Herein, a new assembly for Li–S cells is developed by introducing a montmorillonite (MMT) ceramic protective film to form an ion selective separator. The effect of the MMT-coated separator and the reaction mechanism between MMT and polysulfides are characterized <I>via</I> Raman and zeta potential analyses. The utilization of the MMT coated separator enables the minimization of the shuttle effect by preventing the diffusion of polysulfide. The best discharge capacity and cycle life are obtained with the MMT coated separator in a sulfur–MWCNT composite cathode, resulting in a discharge capacity of 1382 mA h g<SUP>−1</SUP> at a current density of 100 mA g<SUP>−1</SUP> and 924 mA h g<SUP>−1</SUP> after 200 cycles. The Li–S cell using the nano-sized sulfur–MWCNT composite and the MMT-coated separator shows significantly excellent electrochemical performance.</P></▼2>
Ahn, Sang Hyeon,Lee, Eun Jung,Kim, Jin Won,Baek, Kwang Ha,Cho, Hyung-Ju,Yoon, Joo-Heon,Kim, Chang-Hoon Elsevier 2018 Journal of cranio-maxillofacial surgery Vol.46 No.6
<P><B>Abstract</B></P> <P><B>Purpose</B></P> <P>The purpose of this study was to validate and compare treatment outcomes for endoscopic resection of sinonasal inverted papilloma (IP) with or without the use of a navigation system.</P> <P><B>Materials and methods</B></P> <P>A total of 58 patients who underwent endoscopic resection of sinonasal inverted papilloma by a single surgeon from 2007 to 2016 at our institution were retrospectively reviewed. Depending on the use of the navigation system, subjects were divided into two groups: a conventional endoscopic resection group without navigation system (CER group) and a navigation-assisted endoscopic resection group (NER group).</P> <P><B>Results</B></P> <P>There were 24 patients (41.4%) in the CER group and 34 patients (58.6%) in the NER group. Treatment outcomes showed that navigation-assisted endoscopic resection was a more beneficial surgical technique than conventional endoscopic resection for sinonasal IP. Post-surgical recurrence was noted in seven cases (29.2%) in the CER group and two cases (5.9%) in the NER group. Accordingly, the recurrence rate was significantly less in the NER group compared to the CER group (p = 0.026). There were two cases of complications (8.3%) in the CER group comprising cerebrospinal fluid leak and periorbital fat exposure, while no complications were noted for the NER group (p = 0.167).</P> <P><B>Conclusion</B></P> <P>This study demonstrated that navigation-assisted endoscopic removal of sinonasal IP is helpful for reducing recurrence and avoiding surgical complications. Therefore, navigation systems should be always considered when performing endoscopic removal of sinonasal IP.</P>