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( Hongsuk Choi ),( Subin Kim ),( Hayong Song ),( Seokho Suh ),( Hyeong-jin Kim ),( Kwangsup Eom ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.5
In this work, we proposed a facile method to fabricate the three-dimensional porous copper current collector (3D Cu CC) for a Si-dominant anode in a Li-ion battery (LiB). The 3D Cu CC was prepared by combining chemical etching and thermal reduction from a planar copper foil. It had a porous layer employing micro-sized Cu balls with a large surface area. In particular, it had strengthened attachment of Si-dominant active material on the CC compared to a planar 2D copper foil. Moreover, the increased contact area between a Si-dominant active material and the 3D Cu could minimize contact loss of active materials from a CC. As a result of a battery test, Si-dominant active materials on 3D Cu showed higher cyclic performance and rate-capability than those on a conventional planar copper foil. Specifically, the Si electrode employing 3D Cu exhibited an areal capacity of 0.9 mAh cm<sup>-2</sup> at the 300<sup>th</sup> cycles (@ 1.0 mA cm<sup>-2</sup>), which was 5.6 times higher than that on the 2D copper foil (0.16 mAh cm<sup>-2</sup>).
Hongsuk Choi,Sungho Lee,Man-Joong Jeon,Young-Sun Min 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
Background: Studies have investigated the relationship between long work hours and sleep disorders; however, they have focused on shift workers or specific workers who are at high risk of industrial accidents rather than wage workers in general. The purpose of this study is to investigate the effects of long work hours on sleep disorders among non-shift daytime wage workers. Methods: We conducted a secondary analysis of data from the 5th Korean Working Conditions Survey. From the 50,205 total participants, we included 26,522 non-shift daytime wage workers after excluding self-employed people, business owners, unpaid family employees, and wage workers who work nights and shifts. Sleep disorders were categorized into “difficulty in falling asleep,” “frequent waking,” and “waking up with fatigue.” Logistic regression analysis was used to evaluate the influence of long work hours on sleep disorders, and the odds ratios (ORs) were calculated. Results: The OR of working > 52 hours per week was 1.183 (95% confidence interval [CI]: 1.002-1.394) for the risk of developing insomnia compared with working ≤ 40 hours per week. The OR of waking up with fatigue was 1.531 (95% CI: 1.302-1.801). Long work hours showed no significant relationship with difficulty in falling asleep or with frequent waking. Conclusions: Working for extended hours was associated with increased fatigue upon waking in non-shift daytime wage workers.
『웨스트민스터 소요리문답서』에 묘술(描述)된 신적 속성
최홍석(Hongsuk Choi) 신학지남사 2014 신학지남 Vol.81 No.2
This paper analyzes the Westminster Shorter Catechism Question 4 in terms of (i) lexical semantics, (ii) translation of terminology, (iii) interrelationships of attributes, and (iv) the distinction between incommunicable and communicable attributes. Arguably, one of the best definitions of God ever written by man, might be that given in the WSC. This article specifically focuses on two different versions of the Korean translation of “a Spirit” in the WSC Question 4, which are “신”(神, God, Deity) and “영”(靈, Spirit). There exists a subtle distinction in meaning between the two. The question of which one to embrace might depend on each individual’s judgment, yet I put forward that adopting the latter would be more reasonable. It is interesting to note that the two different translations of the WSC might have deprived from different interpretations of the Korean Bible. The Korean Old Version takes the term, “신”, while the Korean Revised Version selects “영”. Often, there is a tendency to maintain traditional manners and customs, but it is proper to follow sound hermeneutics in word selection in translation. Although there is no absolute answer to the question of how the attributes of God should be classified, there are clear benefits in the traditional Reformed method of distinguishing the attributes of God based on those which are communicable and those which are incommunicable. It helps keep us from the errors of Pantheism, as well as Deism. Without being speculative and technical, the WSC Question 4 shows the orderly interrelationships among the attributes, in full agreement with the common method used in the Reformed theological tradition. However, no method escapes the problem of human limitation and sin, and the WSC is no exception. Therefore, the above mentioned methods should be considered in a complementary manner for the peace and spiritual benefit of the church.