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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.
Late Respiratory Infection after Lung Transplantation
( Sang Young Kim ),( Jung Ar Shin ),( Eun Na Cho ),( Min Kwang Byun ),( Hyung Jung Kim ),( Chul Min Ahn ),( Suk Jin Haam ),( Doo Yun Lee ),( Hyo Chae Paik ),( Yoon Soo Chang ) 대한결핵 및 호흡기학회 2013 Tuberculosis and Respiratory Diseases Vol.74 No.2
Background: Aiming to improve outcome of lung transplantation (LTx) patients, we reviewed risk factors and treatment practices for the LTx recipients who experienced respiratory infection in the late post-LTx period (>1 month after LTx). Methods: We analyzed the clinical data of 48 recipients and donors from 61 LTx, who experienced late respiratory infections. Late respiratory infections were classified according to the etiology, time of occurrence, and frequency of donor-to-host transmission or colonization of the recipient prior to transplantation. Results: During the period of observation, 42 episodes of respiratory infections occurred. The organisms most frequently involved were gram (-) bacteria: Acinetobacter baumannii (n=13, 31.0%), Pseudomonas aeruginosa (n=7, 16.7%), and Klebsiella pneumoniae (n=4, 10.0%). Among the 42 episodes recorded, 14 occurred in the late post-LTx period. These were bacterial (n=6, 42.9%), fungal (n=2, 14.3%), viral (n=4, 28.5%), and mycobacterial (n=2, 14.3%) infections. Of 6 bacterial infections, 2 were from multidrug-resistant (MDR) A. baumannii and one from each of MDR P. aeruginosa, extended spectrum β-lactamase (+) K. pneumoniae, methicillin-resistant Staphylococcus aureus and Streptococcus pneumoniae. Infection-related death occurred in 6 of the 14 episodes (43%). Conclusion: Although the frequency of respiratory infection decreased sharply in the late post-LTx period, respiratory infection was still a major cause of mortality. Gram (-) MDR bacteria were the agents most commonly identified in these infections.
Subjective Timbre Space of 45 Modified Violin Tones
Ahn, Chul-Yong,Pang, Hee-Suk,Sung, Koeng-Mo The Acoustical Society of Korea 2000 韓國音響學會誌 Vol.19 No.e1
In this paper we studied the reduced subjective timbre space of time-varying tones as well as steady state tones. 45 modified test tones were constructed from the original violin tone in consideration of 4 physical factors: spectrum envelope, inharmonicity, time-varying spectrum and time reversal. The semantic differential (SD) method was used in the listening test. According to the factor analysis, the adjectives can be factorized into 4 groups. The first factor is characterized by the adjectives, 'free', 'broad', 'deep', 'rich', 'strong' and 'reverberant', the second by 'tenor', 'clear', 'bright', 'light' and 'sharp', the third by 'easy', 'smooth', and 'solid', the fourth by 'warm' and 'full'. The first factor, 'richness', seems to be dependent upon the time-varying characteristic of a tone. The second factor, 'sharpness', is shown to play an important role in a time-varying tone as well as in a steady state tone.
A case of basal cell carcinoma with ductal differentiation
( Sung Jin Park ),( Min Seok Ham ),( Ji Hyuck Hong ),( Dae Yeon Kim ),( Soo Hong Seo ),( Young Chul Kye ),( Hyo Hyun Ahn ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Basal cell carcinoma (BCC) is the most common skin cancer, which mainly occurs on sun exposed areas of the head and neck. There are many clinical, histological subtypes of BCC although these subtypes share some common characteristics. BCCs can be clinically divided into nodular, pigmented, sclerosing, superficial and fibroepithelioma form. From histologic point of view, it can be classified as two groups: undifferentiated and differentiated. Neoplastic cells of BCC mainly differentiate toward follicular germinative cells, although there are other types such as BCCs which differentiate toward sebaceous, follicular, eccrine and appocrine apparatus. A 59-year-old woman presented with asymptomatic bluish black colored waxy plaque on her left parietal scalp area. She had no significant medical history. The lesion first appeared 16 months ago, increasing size without any symptom, and it was diagnosed as BCC with skin biopsy. The histopathology showed nodules and micronodules of basaloid cells, and unusually, had certain basaloid cells in deeper dermis showing ductal differentiation with mildly vacuolated cytoplasm developing duct-like structures. This suggests that BCC differentiated onto ductal apparatus. Herein, we report a rare case of BCC with ductal differentiation.
Dirac electrons in a dodecagonal graphene quasicrystal
Ahn, Sung Joon,Moon, Pilkyung,Kim, Tae-Hoon,Kim, Hyun-Woo,Shin, Ha-Chul,Kim, Eun Hye,Cha, Hyun Woo,Kahng, Se-Jong,Kim, Philip,Koshino, Mikito,Son, Young-Woo,Yang, Cheol-Woong,Ahn, Joung Real American Association for the Advancement of Scienc 2018 Science Vol.361 No.6404
<P>Quantum states of quasiparticles in solids are dictated by symmetry. We have experimentally demonstrated quantum states of Dirac electrons in a two-dimensional quasicrystal without translational symmetry. A dodecagonal quasicrystalline order was realized by epitaxial growth of twisted bilayer graphene rotated exactly 30 degrees. We grew the graphene quasicrystal up to a millimeter scale on a silicon carbide surface while maintaining the single rotation angle over an entire sample and successfully isolated the quasicrystal from a substrate, demonstrating its structural and chemical stability under ambient conditions. Multiple Dirac cones replicated with the 12-fold rotational symmetry were observed in angle-resolved photoemission spectra, which revealed anomalous strong interlayer coupling with quasi-periodicity. Our study provides a way to explore physical properties of relativistic fermions with controllable quasicrystalline orders.</P>