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Sanghak Kim 한국기독교교육정보학회 2020 Journal of Christian education information tech Vol.0 No.38
The ancient baptismal catechumenate, as practiced in the second and third centuries, offers substantial resources for faith formation in the Korean Presbyterian Church of today. Korean Presbyterian churches have tended to emphasize numerical growth over the faith-formation of their members. Even so, the Korean Church has been experiencing a gradual decrease in its membership in recent decades and has been struggling with a sense of Christian identity in the face of traditional Korean religious world views and modern secularism. Furthermore, the Korean Church has begun to lose credibility with the wider society. For its part, the ancient church developed and practiced a baptismal catechumenate in response to the socio-cultural problems. In answer to the contemporary problem, this study explores what the Korean Presbyterian Church can learn from the ancient baptismal catechumenate which focused on initiating the new disciple into a lifelong commitment not only in the church, but also in society.
MinGyu Jeong,HackRyul Kim,SangHoon Kim,SangHak Park,JaeMin Kim,JinSang Yoon 대한신경정신의학회 2005 PSYCHIATRY INVESTIGATION Vol.2 No.1
This study aimed to compare the clinical characteristics and risk factors of alcoholism between the active and inactive forms of mitochondrial aldehyde dehydrogenase 2 (ALDH2) in elderly persons. The study sample consisted of 205 persons with the active form of ALDH2 and 79 persons with the inactive form of ALDH2. Data on alcohol related and socio-demographic characteristics, reports on physical illnesses, clinical diagnosis of alcoholism, and blood sample for ALDH2 genotype and physical status were obtained. There were no significant differences between the active and inactive forms of ALDH2 in terms of the clinical characteristics of alcoholism. In those with active form of ALDH2, no religious observation, having occupation and family history of alcoholism were identified as independent risk factors of alcoholism. However, any variable was identified as independent risk factors of alcoholism in those with inactive form of ALDH2. It was suggested that different preventive strategies for alcoholism might be needed according to the ALDH2 polymorphism.
Jeon, Jiwon,Eom, Taedaehyeong,Lee, Eunyeong,Kim, Sol,Kim, Sanghak,Hong, Ki-Ha,Kim, Hyungjun American Chemical Society 2017 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.121 No.17
<P>As a next-generation solar cell, perovskite solar cells (PSCs) have been attracting considerable attention. A FAPbI(3) is particularly considered as an optimal material with a proper band gap and thus has been employed as a base material for the PSCs with more than 20% efficiency; however, the competitive polymorphic growth of alpha- and delta-phases is a major hurdle in utilizing this material. To provide the theoretical model of the polymorphic phase competition of FAPbI(3) for the first time, we here investigate how compositional engineering can pave a route to control the polymorphic growth of FAPbI(3) using density functional theory combined with a statistical mechanical treatment of the configurational space. We find that dual-site alloying of both cations and halides is critically important to achieve the specific stabilization of the a-phase while maintaining the good miscibility, thermodynamic stability, and optimal band gap property. Based on our first successful theoretical modeling of the FAPbI(3) system and its polymorphic phase competition behavior during, dual-site alloying, we anticipate deriving new rational guidelines on compositional engineering of organic inorganic hybrid perovskite alloys for designing PSCs with high efficiencies and stabilities.</P>
SangHak Shin,Sang-Don Byeon,Jeasang Song,Son Ngoc Truong,Hyun-Sun Mo,Deajeong Kim,Kyeong-Sik Min 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.6
In this paper, a new dynamic reference scheme is proposed to improve the read voltage margin better than the previous static reference scheme. The proposed dynamic reference scheme can be helpful in compensating not only the background pattern dependence but also the cell position dependence. The proposed dynamic reference is verified by simulating the CMOS-memristor hybrid circuit using the practical CMOS SPICE and memristor Verilog-A models. In the simulation, the percentage read voltage margin is compared between the previous static reference scheme and the new dynamic reference scheme. Assuming that the critical percentage of read voltage margin is 5%, the memristor array size with the dynamic scheme can be larger by 60%, compared to the array size with the static one. In addition, for the array size of 64 x 64, the interconnect resistance in the array with the dynamic scheme can be increased by 30% than the static reference one. For the array size of 128 x 128, the interconnect resistance with the proposed scheme can be improved by 38% than the previous static one, allowing more margin on the variation of interconnect resistance.
Climate change risk and the value of cash holdings
Sanghak Choi,Hail Jung,Daejin Kim 한국재무학회 2021 한국재무학회 학술대회 Vol.2021 No.11
In this paper, we investigate the effects of the firm-level climate change risk on the marginal value of corporate cash holdings. The underlying idea is that climate change risks would induce firms to increase their demand for capital, which may also lead to an increase in the value of the cash holdings. As the climate change risk is an uncertainty for firms, investors would also positively evaluate the firm’s excess cash. A regression analysis finds a positive association between the firm-level climate change risk and the value of cash holdings. Furthermore, we also test how the green swan and financial constraint level affect the relationship. Subsample analysis shows that the market positively values the cash holdings of firms that are more sensitive to climate change and that are more financially constrained. Various robustness tests confirm that the baseline regression results are not necessarily driven by endogeneity.
Sanghak CHA,Hyun Gyu LIM,Seokmu KWON,Dong-hwan KIM,Chae Won KANG,Gyoo Yeol JUNG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Carbon monoxide (CO) is a promising carbon source to produce value-added biochemicals via microbial fermentation. However, its bio-conversion has been challenging due to difficulties in genetic engineering of CO-utilizing microorganisms and, more importantly, maintaining CO consumption which is negatively affected by the toxicity of CO and accumulated byproducts. To overcome these issues, we devised mutualistic microbial consortia, consisting of Eubacterium limosum and genetically engineered Escherichia coli for the production of 3-hydroxypropionic acid (3-HP) and itaconic acid (ITA). During the co-culture, E. limosum assimilated CO and produced acetate, a toxic by-product, while E. coli utilized acetate as a sole carbon source. We found that this mutualistic interaction dramatically stabilized and improved CO consumption of E. limosum compared to its monoculture. Consequently, the improved CO consumption allowed successful production of 3-HP and ITA from CO. This study is the first demonstration of value-added biochemical production from CO using a microbial consortium. Moreover, it suggests that synthetic mutualistic microbial consortium can serve as a powerful platform for the valorization of CO.