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하성민(Sung-Min Ha),박상훈(SangHun Park),최지민(Jimin Choi),서영덕(Young-Duk Seo) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
정보 기술의 발전과 더불어 사용자의 구매 행태 또한 빠르게 변화하고 있다. 이에 따라 다양한 수요를 가지는 사용자가 섞인 그룹에 최적의 아이템을 제시하는 그룹 추천시스템의 필요성이 커지고 있다. 그룹 내 사용자들의 만족도를 최대화하기 위해서, 본 논문에서는 게임 이론의 내쉬 균형을 고려한 그룹 추천 알고리즘을 제안하여 최적의 내쉬 아이템 목록을 도출하였다. 이를 기반으로 성능 평가를 실시해 본 결과 그룹에게 추천해준 아이템에 대하여 사용자들의 평균 선호도가 높다는 것을 확인하였다. With the development of Internet technology, the purchasing behavior of users is also changing rapidly. In particular, the need for a group recommendation system that presents optimal items to a group of users with various needs is growing. In order to maximize the satisfaction of users within a group, in this paper, a group recommendation algorithm considering the Nash equilibrium of game theory was proposed to derive an optimal list of Nash items. As a result of performing a performance evaluation based on this, it was confirmed that the average user preference for the item recommended to the group was high.
하성민(Sung Min Ha),최혜정(Hye Jung Choi),신경연(Gyeong Yeon Shin),류병호(Beung Ho Ryu),주우홍(Woo Hong Joo) 한국생명과학회 2016 생명과학회지 Vol.26 No.7
본 연구에서 와인발효의 최적 균주를 조사하였으며 최종 선발된 Saccharomyces sp. BCNU 6006의 발효 특성과 항산화 활성을 측정하였다. 먼저 효모는 막걸리, 과일 그리고 발효 식품에서 분리하였으며, 분리된 균주는 β-glucosidase, glycosidase와 protease 효소 활성과 에탄올 및 SO2 내성에 의해 선별하였고, 추가로 황화수소와 바이오제닉 아민을 생성하는 균주를 제외하여 총 9균주가 선별되었다, 한편 선별균주들은 계통적으로 K. sevazzii와 S. cerevisiae의 subcluster에 속하는 균주로 확인되었다. 최종 선발된 Saccharomyces sp. BCNU 6006균주의 흑마늘 와인 최적 발효조건은 26 brix, 28°C, 10일로 확인되었다. 발효가 완료된 흑마늘 와인의 성분은 에탄올 15.03%, 12brix, pH 4.01로 측정되었고, 총 polyphenol, 총 flavonoid함량, tannin 그리고 5-HMF의 함량은 각각 3.85 mg/ml, 0.51 mg/ml, 5.90 mg/ml, 0.07 mg/ml으로 확인되었다. DPPH 라디칼 소거능, ABTS 라디칼 소거능 및 환원력은 각각 90.77%, 95.20% 그리고 1.261로 측정되었으며, 흑마늘 진액보다 낮았으나, Superoxide anion 라디칼 소거능은 94.42%로 흑마늘 진액보다 높았다. 효소활성, 발효특성 그리고 항산화 효능을 기초로 판단하면 Saccharomyces sp. BCNU 6006에 의해 제조된 흑마늘 와인은 산업적으로 잠재성이 높음이 확인되었다. In the present study, we screened suitable yeasts for wine fermentation and evaluated the fermentative characteristics of Saccharomyces sp. BCNU 6006 and its anti-oxidant activities. Firstly, various yeasts were isolated from Makgeolli, fruits, and fermented foods. Then, the preliminary selections of suitable yeasts were made using an enzymatic activity assay of glucosidase, glycosidase, protease and tolerance to ethanol and SO2. In addition, the production of biogenic amines and hydrogen sulfide was also monitored. The 9 yeast strains initially selected were determined to belong to the genera Saccharomyces and Kazachtania phylogenetically. We investigated the optimal conditions for wine fermented with black garlic juice (BGJ). The optimal conditions of alcohol fermentation using BGJ were 26 brix, 28°C, and 10 days. Finally, the fermentation products of black garlic wine (BGW) fermented with Saccharomyces sp. BCNU 6006 exhibited 15.03% ethanol, 12 brix of sugar, and pH 4.01. The contents of total polyphenol, total flavonoid, tannin, and 5-HMF compound of BGW were 3.85 mg/ml, 0.51mg/ml, 5.90 mg/ml, and 0.07 mg/ml respectively, lower than that of BGJ. DPPH radical scavenging activity, ABTS radical scavenging activity, and reducing power of BGW were 90.77%, 95.20% and 1.261 respectively, lower than that of BGJ. Superoxide anion (O<SUP>2</SUP>-) radical scavenging activity was 94.42%, higher than that of BGJ. Based on the above results, the industrial potential of Saccharomyces sp. BCNU 6006 as a wine-making yeast was confirmed in the present study.
Effects of Thorax Belt Application on the Spinal Stability in Subjects with Wide Infra-sternal Angle
Sung-min Ha(하성민) 한국컴퓨터정보학회 2021 韓國컴퓨터情報學會論文誌 Vol.26 No.4
본 연구의 목적은 정상 범위보다 큰 명치각을 가진 대상자들에게 가슴벨트 적용이 척추 안정성에 어떠한 영향을 미치는지에 대하여 알아보고자 하였다. 정상 범위보다 큰 명치각을 가진 총 15 명의 대상자가 본 연구에 참여했으며 가슴벨트 적용 유-무의 조건에서 능동적 두 다리 내리기와 능동적한 다리 올리기가 수행되었다. 가슴 벨트 적용 여부에 따라 수행 된 두 가지 척추 안정성 테스트 (능동적 두 다리 내리기와 능동적 한 다리 올리기)는 각 조건 간에 유의 한 차이를 보였다. 본 연구의 결과에 따르면, 가슴벨트 적용은 비정상적으로 증가된 명치각으로 인해 척추 또는 몸통 불안정성을 가진 대상자에게 척추를 안정화 시켜줄 수 있는 효과적인 치료적 방법으로 여겨진다. The purpose of this study is to investigate how the application of a Thorax belt affects the stability of the spine in subjects with a wide infra-sternal angle. A total of 15 subject with wide infra-sternal angle participated in the experiment. Active Double leg lowering and active one-leg raising were performed with or without a thorax belt. Two spinal stability tests (active double lowering and active one-leg raising) performed with or without thorax belt application showed significant differences between each condition. Based on the results of present study, the application of a thorax belt is considered to be an effective therapeutic tool that can stabilize the spine to subjects with abnormally increased chest cage and spinal or trunk instability.
곁가지 티올을 사용한 페로브스카이트 양자점의 리간드 교환 연구
유성민 ( Sung-min Yoo ),이명훈 ( Myong-hoon Lee ),하성민 ( Sung-min Ha ),장인수 ( In-su Jang ),이범주 ( Bumjoo Lee ) 한국화상학회 2021 한국화상학회지 Vol.27 No.2
We studied the ligand exchange effect of the perovskite quantum dot (PeQD) to improve the quantum efficiency and stability. Firstly, the oleate ligand of PeQD was exchanged with a branched thiol ligand, 2-ethylhexyl thioglycolate, by using a surface passivation method. It was believed that the branched thiol ligand filled the Br defect of PeQD, which dramatically improved the quantum efficiency from 30% to 80%. In addition, it was found that the dispersion stability in solution was excellent and the optical properties were improved in film as well. FT-IR analyses confirmed that the thiol ligand replaced the oleate ligand and firmly adhered to the PeQD surface, and the thiol ligand did not change the crystal structure, which was further confirmed through XRD analyses.
팔꿉관절 가쪽위관절 통증 환자에서 근위방향 가능적 마사지를 이용한 노쪽 손목 폄근 신장운동이 통증과 근력에 미치는 효과
정성대(Sung-dae Choung),하성민(Sung-min Ha),김수정(Su-jung Kim),박규남(Kyue-nam Park),권오윤(Oh-yun Kwon) 한국전문물리치료학회 2012 한국전문물리치료학회지 Vol.19 No.1
The purpose of this study was to identify the effects of two types of stretching extensor carpi radialis on the visual analog scale (VAS), pressure-pain thresholds (PPTs), grip strength (GS), and strength of wrist extensor (SWE) in patients with lateral epicondylalgia, Sixteen patients with lateral epicondylalgia were recruited for this study and randomly assigned to two groups; the conventional stretching group (CS) and the stretching of proximal functional massage group (PFM); the VAS, PPTs, GS, and SWE were measured before and after the intervention. Over a period of stretching exercises were performed for five minutes per day, five days per week. The paired t-test and Wilcoxon signed-rank test were used to determine the statistical differences in the VAS, PPTs, GS, and SWE (pre- and post-test). The Independent t-test and Mann-Whitney U test were used to compare the effects of stretching exercises between the CS and PFM groups. The results of this study demonstrated that in the PFM group, the PPTs, GS, and SWE significantly increased, and the VAS decreased (p<.05). In the CS group, the VAS and GS increased significantly after the three-week intervention (p<.05). Pain was decreased and strength (GS and SWE) was increased in the PFM group, compared to the CS group (p<.05). The findings of this study indicate that PFM technique can be applied for decreasing pain and increasing the GS and SWE in patients with lateral epicondylalgia.