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이철희,안성만,Lee, Chul-Hee,Ahn, Sung-Mahn 한국통계학회 2012 Communications for statistical applications and me Vol.19 No.3
본 연구에서는 자기조직화 신경망이 필요한 노드만을 가지고 최적화하여 정규혼합분포를 추정하는 모형(Ahn과 Kim, 2011)을 Java언어에서 제공하는 스레드(thread)를 기반으로, 멀티코어 컴퓨팅환경에서 병렬처리방식으로 구현하여 순차처리방식에 비해 짧은 연산시간으로 정규혼합모형의 추정이 가능함을 보이려고 한다. 이를 위하여 Ahn과 Kim이 제안한 모형을 바탕으로 두 가지의 병렬처리 방법을 제안하고 그 성능을 평가하였다. 병렬처리 방법은 Java의 멀티스레드를 이용하여 구현되었으며, 모의실험을 통하여 제안한 모형이 순차처리방식과 비교하여 수렴속도가 빠름을 확인하였다. This article proposes a couple of parallel implementations of the self-organizing network for normal mixtures. In principle, self-organizing networks should be able to be implemented in a parallel computing environment without issue. However, the network for normal mixtures has inherent problem in being operated parallel in pure sense due to estimating conditional expectations of the mixing proportion in each iteration. This article shows the result of the parallel implementations of the network using Java. According to the results, both of the implementations achieved a faster execution without any performance degradation.
요통(腰痛) 환자에 대한 침치료(針治療)와 직접구(直接灸) 병행치료(竝行治療)에 대한 비교(比較) 연구(硏究)
위종성,원승환,황정수,선승호,안영민,손승현,박기철,박희수,We, Jong-sung,Won, Seung-hwan,Hwang, Jung-soo,Sun, Seung-ho,Ahn, Young-min,Sohn, Seung-hyun,Park, Ki-chul,Park, Hee-soo 대한침구의학회 2004 대한침구의학회지 Vol.21 No.6
Objective : The purpose of this report is to examine the effects of direct moxibustion in the Low back pain patient. Methods : Clinical studies were done 30 patients who were treated with low back pain to Dept. of Acupuncture & Moxibustion, of Oriental Medical Sang-Ji University from September 1, 2003 to August 31, 2004. We treated them by Oriental medical therapy(including direct moxibustion)for 10 days. The evaluation was performed five times(admission day, before and after each twice). Results : 1. VAS was decreased after direct moxibustion for 10 days significantly(p<0.01). 2. After direct moxibustion, S.L.R. T angle of patients were increased. ConclUsions : We brought to the conclusion that direct moxibustion has possibility to the efficient to cure the Low back pain. So we suggest the possibility to use this treatment for Low back pain.
Ahn, Young-Ki,Ahn, Duk-Min,Yang, Ji-Chul,Kulkarni, Atul,Choi, Hoo-Mi,Kim, Tae-Sung The Korean Society Of SemiconductorDisplay Technol 2011 반도체디스플레이기술학회지 Vol.10 No.3
The performance of the DRAM is strongly dependent on the purity and surface roughness of the TIT (TiN/Insulator/ TiN) capacitor electrodes. Hence, in the present study, we evaluate the effects of organic contamination and change of surface roughness on the cylindrical TIT capacitor electrodes during the wet cleaning process by various analytical techniques such as TDMS, AFM, XRD and V-SEM. Once the sacrificial oxide and PR (Photo Resist) are removed by HF, the organic contamination and surface oxide films on the bottom Ti/TiN electrode become visible. With prolonged HF process, the surface roughness of the electrode is increased, whereas the amount of oxidized Ti/TiN is reduced due to the HF chemicals. In the 80nm DRAM device fabrication, the organic contamination of the cylindrical TIT capacitor may cause defects like SBD (Storage node Bridge Defect). The SBD fail bit portion is increased as the surface roughness is increased by HF chemicals reactions.
Ahn, Hong Ryul,Lee, Hee Ju,Kim, Kyung-A,Kim, Chul Young,Nho, Chu Won,Jang, Holim,Pan, Cheol-Ho,Lee, Chang Yong,Jung, Sang Hoon American Chemical Society 2014 Journal of agricultural and food chemistry Vol.62 No.6
<P>We investigated the effects of an ethanol extract of <I>C. denticulatum</I> (EECD) in a mouse model of glaucoma established by optic nerve crush (ONC), and found that EECD significantly protected against retinal ganglion cell (RGC) death caused by ONC. Furthermore, EECD effectively protected against <I>N</I>-methyl-<SMALL>d</SMALL>-aspartate-induced damage to the rat retinas. <I>In vitro</I>, EECD attenuated transformed retinal ganglion cell (RGC-5) death and significantly blunted the up-regulation of apoptotic proteins and mRNA level induced by 1-buthionine-(<I>S</I>,<I>R</I>)-sulfoximine combined with glutamate, reduced reactive oxygen species production by radical species, and inhibited lipid peroxidation. The major EECD components were found to be chicoric acid and 3,5-dicaffeoylquinic acid (3,5-DCQA) that have shown beneficial effects on retinal degeneration both <I>in vitro</I> and <I>in vivo</I> studies. Thus, EECD could be used as a natural neuroprotective agent for glaucoma, and chicoric acid and 3,5-DCQA as mark compounds for the development of functional food.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2014/jafcau.2014.62.issue-6/jf4046232/production/images/medium/jf-2013-046232_0012.gif'></P>
The Three-Stage Cluster Unrelated Question Model
Ahn, Seung-Chul,Lee, Gi-Sung 한국데이터정보과학회 2003 한국데이터정보과학회지 Vol.14 No.1
In this study, we systemize the theoretical validity for applying unrelated question model to three-stage cluster sampling method and derive the estimate and it's variance of sensitive parameter. We derive the minimum variance form under the optimal values of the subsample sizes when the cost are fixed. Under the some given precision, we obtain the optimal values of the subsample sizes and derive the minimum cost form by using them.
Study of New PMSM Design for Leakage Magnetic Flux Reduction
Ahn, Han-Woong,Jun, Hyun-Woo,Lee, Hyung-Woo,Go, Sung-Chul,Lee, Ju The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
<P>This paper suggests the new PMSM design that can reduce leakage magnetic flux. Through adapting non-magnetic frame structure, it decreases leakage magnetic flux on the rotor's rib and web structure. And with this, it increases power density of the motor. To verify the effectiveness of the new design of rotor compared to the common type, through small sized real model's test was conducted. To obtain final model, structural FEM analysis was also used for structural stability. Additional loss generation problem that can occur in the new frame structure was checked with the 3D FEM analysis.</P>
Ahn,Sang-Pil,Kim,Chul-Hwan,Aggarwal,Raj.K,Johns,Allan T 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-
This paper presents a new concept based on variable dead time control, in adaptive single pole auto-reclosing(SPAR). The proposed scheme can give rise to a high rate of successful reclosing by adapting to variable dead times. The significance of this algorithm is that it uses the waveform patterns of the voltage transients following initial breaker opening. The performance of this proposed method is tested under a variety of fault locations on the Korean 765kV system, and the outcome of the study clearly indicates that variable dead time auto-reclosing scheme can be used as an attractive and effective means of better management and operation of a high voltage transmission system.
Patterns of care for patients with nasopharyngeal carcinoma (KROG 11-06) in South Korea
Sung, Soo Yoon,Kang, Min Kyu,Kay, Chul Seung,Keum, Ki Chang,Kim, Sung Hwan,Kim, Yeon-Sil,Kim, Won Taek,Kim, Ji-Yoon,Kim, Jin-Hee,Moon, Sung Ho,Ahn, Yong Chan,Oh, Young Taek,Wu, Hong-Gyun,Lee, Chang-Ge The Korean Society for Radiation Oncology 2015 Radiation Oncology Journal Vol.33 No.3
Purpose: To investigate the patterns of care for patients with nasopharyngeal carcinoma (NPC) in South Korea. Materials and Methods: A multi-institutional retrospective study was performed (Korean Radiation Oncology Group [KROG] 11-06) on a total of 1,445 patients from 15 institutions. Results: Of the 1,445 patients, more than half were stages III (39.9%) and IV (35.8%). In addition to patterns of care, we also investigated trends over time with the periods 1988-1993, 1994-2002, and 2003-2011. The frequencies of magnetic resonance imaging and positron emission tomography-computed tomography were markedly increased in the third period compared to previous 2 periods. Concurrent chemoradiation (CCRT) was performed on 894 patients (61.9%), neoadjuvant chemotherapy on 468 patients (32.4%), and adjuvant chemotherapy on 366 patients (25.3%). Of stage II-IV patients, CCRT performed on 78.8% in 2003-2011 compared to 15.0% in 1988-1993. For patients treated with CCRT, cisplatin was the most commonly used agent in 81.3% of patients. Over the periods of time, commonly used radiotherapy (RT) techniques were changed from 2-dimensional RT (1988-1993, 92.5%) to 3-dimensional RT (2003-2011, 35.5%) or intensity-modulated RT (IMRT; 2003-2011, 56.5%). Median RT doses given to primary tumors, high-risk lymphatics, and low-risk lymphatics were 70.0 Gy, 58.1 Gy, and 48.0 Gy, respectively. Adoption of IMRT increased the dose per fraction and escalated total radiation dose. Conclusion: Assessment of the patterns of care for NPC patients in South Korea demonstrated that management for NPC including diagnostic imaging, treatment regimen, RT techniques and dose schedule, advanced in accordance with the international guidelines.
Sang Kyoo Paik,Seung Ki Choi,Jong Wook Lee,Tae Heon Kim,Dong Kuk Ahn,Atsushi Yoshida,Yun Sook Kim,Yong Chul Bae 대한해부학회 2010 Anatomy & Cell Biology Vol.43 No.4
Ultrastructural parameters related to synaptic release and their correlation with synaptic connectivity were analyzed in the low-threshold mechanoreceptive vibrissa afferent boutons in laminae III and IV of the trigeminal caudal nucleus (Vc). Rapidly adapting vibrissa afferents were intra-axonally labeled, and quantitative ultrastructural analyses with serial sections were performed on the labeled boutons and their presynaptic endings (p-endings). The volume of the labeled boutons was widely distributed from small to large ones (0.8~12.3 μm3), whereas the p-endings were small and uniform in size. The volume of the labeled boutons was positively correlated with the ultrastructural parameters such as mitochondrial volume (correlation coefficient, r=0.96), active zone area (r=0.82) and apposed surface area (r=0.79). Vesicle density (r=-0.18) showed little correlation to the volume of labeled boutons, suggesting that the total vesicle number of a bouton is proportional to its volume. In addition, the bouton volume was positively correlated with the number of p-endings (r=0.52) and with the number of dendrites postsynaptic to the labeled bouton (r=0.83). These findings suggest that low-threshold mechanoreception conveyed through vibrissa afferents is processed in a bouton size-dependent manner in the Vc, which may contribute to the sensory-motor function of laminae III/IV in Vc.