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Soo-Min Ahn(안수민),Jeong-Kil Park(박정길),Sung-Ae Son(손성애) 대한치과재료학회 2021 대한치과재료학회지 Vol.48 No.3
Universal adhesives that simplify bonding procedures and be used in multi-etch mode have been developed. In this study, the effects of agitation and solvent evaporation time of a universal adhesive on microtensile bond strength (μTBS) were evaluated by varying the times of these two procedures. Eighteen human molars were used to fabricate specimens, and the teeth were randomly divided into six experimental groups. Each group had different agitation time (5 s, 10 s, 20 s) and evaporation time (10 s, 20 s). The specimens were cut into a rod-shape with a cross-sectional area of 1 ㎟, and their μTBS was measured. The data were analyzed using an ANOVA and Tukey’s post hoc test. After this, the debonded surface was observed using scanning electron microscopy (SEM). In the groups with a solvent evaporation time of 20 s, μTBS was statistically higher, even with a short agitation time (p<0.05). Furthermore, for the groups with the shorter evaporation time, bonding strength decreased statistically as the agitation time shortened (p<0.05). The results of this experiment suggest that if the solvent was adequately evaporated, sufficient bonding strength could be obtained even when the adhesive was agitated for a short time. This is supported by the results of SEM image analysis, which revealed a uniform adhesive layer with well-infiltrated tags in the groups with the prolonged evaporation time. It may be crucial to secure an adequate evaporation time in order to obtain optimal bonding strength.
크론병 환자에서 Azathioprine 치료 중 발생한 다형성 지방육종
안수민 ( Soo Min Ahn ),서승오 ( Seong O Suh ),오유미 ( Yu Mi Oh ),윤창용 ( Chang Yong Yun ),심형훈 ( Hyoung Hun Sim ),박채아 ( Chae A Park ),송철민 ( Cheol Min Song ),배지윤 ( Ji Yoon Bae ) 대한소화기학회 2013 대한소화기학회지 Vol.62 No.4
Azathioprine is frequently used for the treatment of inflammatory bowel diseases (IBD) such as Crohn`s disease and ulcerative colitis. Lymphomas, squamous cell carcinomas, and undifferentiated pleomorphic sarcomas have been reported among patients receiving azathioprine therapy. Herein, we report a case of pleomorphic liposarcoma of chest wall which occurred in a 44-year-old man with Crohn`s disease taking azathioprine. He was diagnosed with Crohn`s disease 3 years ago after suffering from abdominal pain and hematochezia for 12 years. He had been taking 50 mg of azathioprine per day for 23 months when he visited the thoracic and cardiovascular surgery clinic due to right chest palpable mass that had rapidly grown during the past 2 months. Excisional biopsy was performed and the mass was diagnosed as pleomorphic liposarcoma. Therefore, he underwent radical excision of the right chest wall mass, which measured 11.0×6.5 cm in size. He is scheduled to receive radiation therapy and chemotherapy. (Korean J Gastroenterol 2013;62:248-252)
조정래,강원미,안수민,Cho, Jung Rae,Kang, Won Me,Ahn, Soo Min Korean Association of Pediatric Surgeons 2014 소아외과 Vol.20 No.2
Purpose: Currently the substantial clinical benefits of single-port laparoscopic appendectomy (SLA) over conventional three-port laparoscopic appendectomy (CLA) are equivocal. The aim of this study was to compare surgical outcomes between SLA and CLA in children with acute appendicitis. Methods: A single blind prospective randomized single center study was performed to compare the surgical outcomes of SLA and CLA. A total of 105 patients were randomized and various parameters were analyzed, 52 patients with SLA and 53 patients with CLA between July 2013 and March 2014. Patients with sonographically confirmed acute appendicitis were randomly assigned to receive either SLA or CLA. The outcome measurements were operating time, wound complication, and intraperitoneal morbidities, postoperative pain score and cosmetic result score. Results: Operating time is significantly longer in SLA ($70.4{\pm}26.7$ minutes vs. $58.0{\pm}23.4$ minutes; p=0.016). There were no significant differences in the postoperative wound complication rate and intraperitoneal morbidities between two groups. There were no significant differences in postoperative resting pain score ($6.6{\pm}2.5$ vs. $6.3{\pm}2.5$; p=0.317) and activity pain score ($6.9{\pm}2.4$ vs. $6.3{\pm}2.5$; p=0.189), and the cosmetic result score ($9.2{\pm}1.1$ vs. $9.1{\pm}1.4$; p=0.853). Conclusion: Although SLA would be a safe and feasible procedure in children, SLA could not demonstrate the clear benefit over CLA.
소아 청소년의 급성 충수염: 천공과 연관된 인자 및 원인균
이솔,권혁진,안수민,이관섭,김광남,Lee, Sol,Kwon, Hyuck Jin,Ahn, Soo Min,Lee, Kwan Seop,Kim, Kwang Nam 대한소아감염학회 2018 Pediatric Infection and Vaccine Vol.25 No.1
Purpose: This study aimed to determine which factors are related to perforated appendicitis. We also conducted a survey to identify the causative organism. Methods: From January 2011 to December 2014, 569 pediatric patients (322 male) younger than 19 years old who underwent an appendectomy due to acute appendicitis at Hallym University Sacred Heart Hospital were enrolled. Patients' medical records were reviewed retrospectively to determine their clinical manifestations, laboratory and imaging results, and pathogens. Results: About 127 patients (22%) had perforated appendicitis. The rate of perforated appendicitis in preschool, late childhood, and adolescent ages were 50%, 27%, and 16.8%, respectively. The risk factors of perforation were high C-reactive protein levels and the presence of appendiceal fecalith (P<0.001). Of the 24 samples of peritoneal fluid and periappendiceal pus that were collected intraoperatively, 16 were culture positive. The most common pathogen was Escherichia coli (n=10), and others were Pseudomonas aeruginosa, Streptococcus spp., and Staphylococcus spp. Conclusions: The perforation rate of appendicitis among patients younger than 5 years old was 50%, and this decreased in proportion with age. Clinicians should be aware of the possibility of perforation when patients with appendicitis have high C-reactive protein levels or the presence of appendiceal fecalith on imaging.
SBW 반력 장치용 모터의 코깅 토크, 토크 리플 및 전자기력 고조파 저감을 위한 회전자 형상에 따른 비교 연구
원윤재(Yun-Jae Won),안수민(Soo-Min Ahn),김재현(Jae-Hyun Kim),임명섭(Myung-Seop Lim),김두영(Doo-Young Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In this paper, the development of steering system and SBW (Steer by wire) system are introduced. Also, designs for reducing cogging torque, torque ripple and electromagnetic force harmonics that affect vibration in the motor for reaction force device used in the system of SBW are studied. In addition, according to rotor shape, three types of motors are designed to reduce vibration considering the same design specifications. First, it is designed as a SPMSM (Surface-mounted permanent magnet synchronous motor) type that is advantageous in terms of control. Second, it is designed as an IPMSM (Interior permanent magnet synchronous motor) type advantageous for power density. Third, in order to reduce the use of permanent magnets, it is designed as a CP-PMSM (Consequent pole permanent magnet synchronous motor) type. Using the FEA (Finite Element Analysis), the design parameters that affect cogging torque, torque ripple and electromagnetic force harmonics are identified. Then, the optimal design is carried out by selecting the objective function and constraint conditions. The optimal design result based on the surrogate model depends on how well the surrogate model simulates the performance. Therefore, in the optimal design, an surrogate model is created using the kriging method, and the predicted performance is verified to match the true value. Finally, the performance of these three types of motors is compared to suggest a motor type suitable for SBW.
Row-지향과 Column-지향 데이터베이스의 조인 질의 처리 비용 비교
오병중 ( Byung-jung Oh ),안수민 ( Soo-min Ahn ),김경창 ( Kyung-chang Kim ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
데이터 레코드를 가로(row-wise)로 저장하는 기존의 데이터베이스를 Row-지향 데이터베이스, 세로 (column-wise)로 저장하는 데이터베이스를 Column-지향 데이터베이스라 정의하자. 본 논문에서는 Row-지향 데이터베이스와 Column-지향 데이터베이스에서 분석 workload 형태의 조인 질의를 처리하여 비교 우위 성능을 보이는 데이터베이스 시스템을 고찰하고자 한다. 객관적인 성능 실험을 위해 분석적 모델인 스타 스키마 벤치마크를 이용하였다. Nested Loop 조인과 Sort Merge 조인 기법을 사용한 실험에서 Column-지향 데이터베이스의 성능이 우수하게 나타났음을 확인할 수 있다.