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병렬 공간 데이터베이스의 질의 처리를 위한 비용 모델의 설계 (pp.90-92)
안성우(Sung-Woo Ahn),서영덕(Young-Dok Seo),홍봉희(Bong-Hee Hong) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1B
비용모델과 측정(Cost Model and Estimation)은 모든 DBMS에서 성능 측정을 하기 위한 기본적인 도구이다. 지금까지의 질의 수행에 대한 비용모델을 제시하는 연구가 많이 있었지만 대부분의 연구가 특정 부분에 대한 비용-CPU비용, 색인 방법에 대한 I/O횟수, I/O비용 등-만을 고려함으로써 질의를 수행하는데 필요한 전체적인 비용을 산출하는데 부족한 점이 있었다. 그리고 병렬 공간 DBMS에 대한 비용모델을 산출하는 연구가 아직까지 이루어지지 않았다. 이 논문에서는 병렬 공간 DBMS에서 질의를 처리하는데 드는 전체적인 비용을 산출하고 있다. 기존의 연구에서 제시하고 있는 비용모델을 적용하고, 병렬 컴퓨터와 공간 데이터가 결합되었을 때의 고려사항을 추가하여 병렬 공간 DBMS에 적합한 전체적인 비용모델을 산출함으로써 병렬 공간 DBMS에서의 효율적인 질의수행에 대한 다른 연구를 수행할 때 비용모델에 대한 초석을 제공한다.
1형 양극성 장애 환자에서 리튬과 발프로산의 장기간 치료 효과에 대한 후향적 평가 : 2년 이상 치료받은 환자의 효과 비교
안성우,양소영,최유진,홍경수,Ahn, Sung Woo,Yang, So-Yung,Choi, Yujin,Hong, Kyung Sue 대한생물정신의학회 2016 생물정신의학 Vol.23 No.4
Objectives Treatment response of bipolar disorders (BDs) to long-term mood stabilizers maintenance has not been well explored because of complicated clinical and treatment courses. This study aims at investigating long-term clinical response of BDs to lithium and/or valproate in a naturalistic setting of a tertiary-care university-affiliated hospital. Methods Subjects were 65 patients with bipolar I (BD-I) disorders who had been treated with lithium and/or valproate for more than two years at single bipolar disorder clinic. Long-term response to the best treatment based on treatment algorithms and the current clinical standard of care was retrospectively evaluated using the Alda Scale and the Clinical Global Impression Scale for use in bi-polar illness (CGI-BP). Patients were classified into full responder and partial/non responder groups based on the total score of the Alda Scale with the cut-off score generated from the frequentist mixture analysis of the authors' previous study. Results The mean duration of treatment with the index medication was 69.2 months. Baseline demographic and clinical characteristics were not different among three mood stabilizer groups (valproate, lithium, and combination groups). Twenty-one subjects were classified into full responder group (32.3%). Treatment response assessed by the Alda Scale and CGI-BP scores was not different between lithium and valproate groups. The Alda Scale scores were well correlated with the CGI-BP scores (p < 0.05). Conclusions One third of the patients showed a full response to the long-term lithium and/or valproate treatment in BD-I. The degree of response was similar between lithium and valproate groups.
(중소유통업 활성화 방안을 위한) “대ㆍ중소 유통기업간 상생협력 실증사례 연구”
안성우(Ahn, Sung-Woo) 한국유통과학회 2009 한국유통과학회 학술대회 논문집 Vol.2009 No.-
유통시장 개방이후 신유통업태의 확산과 대형유통점의 급성장으로 중소유통업의 비중이 갈수록 감소하고 있다. 위기에 직면한 중소유통업체는 정부에 대형점에 대한 규제강화를 강력히 요구하고 있다. 에 대해 대형유통업체는 시장논리에 맞지 않는다며 정부의 일방적 규제 움직임에 크게 반발하고 있다. 본 연구는 최근 사회적 이슈로 주목을 받고 있는 대기업의 기업형슈퍼마켓 시장진출 확대로 빚어진 대․중소 유통업체간 갈등해소 방안에 대한 대안을 모색하고자 국내 유통산업의 동향과 변화추이를 분석하고 중소유통업의 당면한 문제점의 실상을 분석하였다. 이론적 고찰을 통해 분석된 자료를 토대로 대․중소 유통업체간 상생협력 방안에 대해 대안을 모색함에 있어 실제 산업현장에서 이뤄지고 있는 상생협력 실증사례를 분석하였다. 실증사례 분석모델 범위는 물류부문에 대한 대․중소 유통기업간 전략적 제휴동기와 제휴과정 그리고 제휴 성과이며, 분석결과를 통해 대․중소 유통업체간 상생협력 대안으로 제시하였다.
안성우,박은희,김미은,Ahn, Sung-Woo,Park, Eun-Hee,Kim, Mee-Eun Korean Academy of Orofacial Pain and Oral Medicine 2005 Journal of Oral Medicine and Pain Vol.30 No.3
The purpose of this double-blind study was to evaluate clinical effects of botulinum toxin type A (BTX-A) injection on myofascial pain syndrome (MPS) involving upper trapezius and compare with those of lidocaine injection. 21 patients presenting with active TrP1 and/or TrP2 in the upper trapezius over 6 months were selected for this study. The subjects were randomly divided into two groups; one group injected with BTX-A (15 unit of $Botox^{(R)}$ / 0.3 ml per trigger point (TrP)) and the other group injected with 0.5% lidocaine (0.3 ml /TrP). The clinical effects were evaluated by VAS and PPT at baseline, 2, 4, 6 and 8 weeks after treatment. BTX-A group showed persistent decrease of VAS values and increase of PPT values following treatment. While there was no significant difference in VAS values between BTX-A and lidocaine groups (p=0.347), there was significant difference in PPT values after treatment between two groups (p=0.000). The subjects received BTX-A showed noticeable improvement in PPT values after treatment, suggesting more reliable effect of BTX-A injection compared with lidocaine injection. The results of this study support that the direct injection of BTX-A to a TrP is an effective and safe treatment for MPS involving upper trapezius.
그리스 윤활 소형 이송계 마찰력의 이력현상 측정 및 분석
안성우(Sung Woo Ahn),정영훈(Young Hun Jeong),송창규(Chang Kyu Song) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.4
A precision linear motion table plays a crucial role in manufacturing systems used in various industries such as machine tools, semiconductors, and nanofabrication. In particular, one of the most typical mechanisms for a linear motion table is to use a ballscrew and LM guides. However, this mechanism is inevitably influenced by friction because of the relative motion in its joint regions. One of the most complex phenomena in friction is the hysteresis behavior of dynamic friction, which was compared with the steady dynamic friction that was presented using a Stribeck curve in this study. Therefore, we investigated the dynamic friction and its hysteresis behavior using a miniaturized linear table equipped with a ballscrew and LM guides that were lubricated with grease. Subsequently, it could be seen that hysteresis could be considered a time delay after zero-velocity crossing and that it was influenced by acceleration.
안영상,전영일,안재성,전상룡,김정훈,나영신,노성우,김창진,권양,임승철,이정교,권병덕,Ahn, Young Sang,Chun, Young Il,Ahn, Jae Sung,Jeon, Sang Ryong,Kim, Jeong Hoon,Ra, Young Shin,Roh, Sung Woo,Kim, Chang Jin,Kwon, Yang,Rhim, Seung Chul,Lee 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.5
Objective : Transseptal or sublabial transsphenoidal surgery has been standard teatment for pituitary tumors for decades. However, as an alternative to this surgery endonasal endoscopic technique has been reported with encouraging results. We have started endoscopy-assisted transsphednoidal surgery from May 1998. In this paper we analyzed the methods, outcome, advantage and disadvantage of this surgical approach for the purpose of planning optimal treatment of pituitary tumors. Methods : This study consisits of 13 cases of pituitary tumors who were treated by endoscopy-assisted transsphenoidal surgery using one nostril from May 1998 to July 1999. Mean follow up period was 12.9 months. Results : There was no septal or sublabial incision and little surgical damage to nasal structure. With this technique, rapid surgical approach and short hospital day were possible, being 3-6 days in patients without CSF leakage. Using various angled endoscope, good surgical view was obtained. Initially it was difficult to use various instruments in narrow nasal cavity, but became feasible after several procedures. Among 13 cases, total removal was possible in 11 cases. One of two cases in whom tumor was incompletely removed underwent gamma-knife radiosurgery and second underwent reoperation through subfrontal approach. There were 6 cases of hormone secreting tumors and hormonal remission was achived in all of these cases. Postoperative complications were CSF leakage(6 cases), diabetes insipidus(2 cases) and panhypopituitarysm(1 case). Lumbar drainage was done in all cases of CSF leakage. Conclusion : The advantage of endoscopy-assisted transsphenoidal surgery are rapid surgical approach, low postoperative morbidity, short hospital day and good surgical view. The disadvantage of this appoach are difficulty in manupulating various instruments in narrow nostril and difficulty in distance perception but these problems can be overcome by practice and using stereoscopic endoscope.