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이진혁,Dae-Hee Lee,Jong-Hoon Park,Dong Won Suh,Eunseon Kim,장기모 대한슬관절학회 2020 대한슬관절학회지 Vol.32 No.-
Background: Only limited data are available regarding postural stability between anterior cruciate ligament (ACL)-injured patients with medial meniscus (MM) tear and those with lateral meniscus (LM) tear. The purpose of this study was to compare preoperative postural stability for both involved and uninvolved knees in ACL rupture combined with MM and LM tears. It was hypothesized that there would be a significant difference in postural stability between these two groups. Methods: Ninety-three ACL-injured patients (53 combined with MM tears vs. 40 combined with LM tears) were included. Static and dynamic postural stability were evaluated with the overall stability index (OSI), anterior–posterior stability index (APSI), and medial–lateral stability index (MLSI) using stabilometry. Knee muscle strength was evaluated using an isokinetic testing device. Results: In the static postural stability test, none of the stability indices showed significant differences between the two groups for both knees (p > 0.05). In the dynamic postural stability test for involved side knees, the OSI and APSI were significantly higher in the LM tear group compared to the MM tear group (OSI: 2.0 ± 0.8 vs. 1.6 ± 0.5, p = 0.001; APSI: 1.5 ± 0.6 vs. 1.3 ± 0.5, p = 0.023), but not the MLSI (p > 0.05). In the static and dynamic postural stability tests in each group, there were no significant differences between the involved and uninvolved side knees (p > 0.05). There was no significant difference in the knee muscle strength between the two groups (p > 0.05). All postural stability showed no significant correlation with knee muscle strength (p > 0.05). Conclusion: Dynamic postural stability was poorer in patients with ACL rupture combined with LM tear than in those with MM tear. Therefore, close monitoring for postural stability would be necessary during preoperative and postoperative rehabilitation, especially for patients with ACL rupture combined with LM tear.
이진혁,오민지,Lee, Jin-hyuk,Oh, Min-ji 대한한방내과학회 2018 大韓韓方內科學會誌 Vol.39 No.2
Objectives: This study was designed to evaluate the effect of Korean medicine treatment on four cases involving hemorrhoid patients. Methods: Four patients suffering from hemorrhoids were treated with Korean medicine treatment, such as herbal medicine, and acupuncture. Patients were diagnosed using pictures of the anus, which were used to compare before and after treatment and to evaluate treatment efficacy. Results: After treatment, the symptoms of pain and other complaints conspicuously improved. Conclusions: As indicated by before and after treatment pictures of the anus and decreased symptoms, Korean medicine treatment is effective in treating hemorrhoids.
이진혁,황경란,이진석,이경환 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Due to its low cost and availability, lignocellulosic biomass is a highly potential renewable materials. The bio-oil from pyrolysis of biomass has high content of oxygen, more acidic compounds and low heating value. Thus, it requires the upgrading processes of bio-oil to get high-quality bio-oil. In this study, we compared the product distribution from catalytic upgrading of furfural over ZSM-5 with a different particle size (average particle size; about 0.3mm, 3.2mm). The experiment were conducted in a continuous plug flow reactor at atmosphere pressure during 20 minutes, in a temperature range of 400 to 600°C. The convertsion of furfural to furan, mono-rings, PAHs in main liquid products, and olefins, CO, CO<sub>2</sub> in gas products was clearly differed with particle size.
Collection of Personal Data with Information Externality in Two-Sided Markets
이진혁,김형진 한국계량경제학회 2020 계량경제학보 Vol.31 No.3
We study the conditions under which an internet platform excessively collects personal information when information externality exists. A monopolistic platform runs two-sided business where users and firms form each side. Users do not pay fees to the platform, but firms pay for targeted advertisements. In an environment where marginal information externality is large, the amount of personal information collected exceeds social optimum i) when the utility of marginal user does not make up for the aggregate disutility of existing users and firms and ii) when the platform extracts large markup from firms to keep users.