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- 저자 : Youngjae Kim (검색결과 803 건)
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남송중기 황간(黃榦)이 한양군(漢陽軍)에서 실시한 진휼(賑恤) -그의 황정(荒政) 기록을 통해서 본 이곳 거주민의 모습-
김영제 ( Kim¸ Youngjae ) 중국사학회 2021 中國史硏究 Vol.- No.131
This article examines the relief works performed by Huang Gan who was a great Daoxue(道學) scholar as well as the local governor of the Hanyang prefecture in the mid-Southern Song period. Through this research, some significant discoveries about the local situations of the backward regions like the Hanyang prefecture and the local relief system during the Southern Song could have been made. Above all, the Hanyang prefecture had different relief system from the other regions then. While the Hanyang prefecture did not have any disaster relief agency like Yicang(義倉), the state-operating granaries like the Changpingcang(常平倉), which had usually played the role of the adjustment of grain prices in the regions, took over the role of the Yichang. When Huang took the post of prefect, a severe drought struck the region. Since it quickly revealed that the drought was beyond the limitations of Changpingcang, Huang established a new relief organization like the Baowu(保伍) system, an organization of mutual assistance by the local people. By allowing the local rich to provide the poor with the relief rice, the Southern Song government rewarded government posts to the rich as compensation instead. Through the Baowu system, in addition, Huang was able to grasp the exact circumstances of the damage with considerable efficiency. Not only as the local prefect but as a Daoxue scholar, on the other hand, Huang eventually succeeded in drought relief through establishing a local autonomous relief system like the Shecang(社倉) by Zhu Xi(朱熹)’s. Above of all, however, the most significant contribution of this research is that it kindly helped us to understand how the local government and local community could have coped with the severe disaster together during the Southern Song period.
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( Youngjae Cho ),( Eiseul Kim ),( Sun-kyung Han ),( Seung-min Yang ),( Mi-ju Kim ),( Hyun-joong Kim ),( Chang-gyeom Kim ),( Dong-won Choo ),( Young-rok Kim ),( Hae-yeong Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.9
Vibrio species are generally recognized as pathogens predominant in seafood along coastal areas. The food industry has sought to develop efficient microbial detection methods. Owing to the limits of conventional methods, this study aimed to establish a rapid identification method for Vibrio isolated from Korea, based on matrix-assisted laser-desorption/ionization timeof- flight mass spectrometry (MALDI-TOF MS). Four different preparation procedures were compared to determine the appropriate means to pretreat Vibrio species, using 17 isolates and five reference strains. Extended direct transfer and full formic acid extraction methods using bacterial colonies on agar plates revealed very low identification rates. Formic acid and trifluoroacetic acid (TFA) extractions using bacterial broth cultures were also performed. All Vibrio isolates and reference strains prepared by TFA extraction were successfully identified to the species level (17/22, 77.3%) and to the genus level (5/22, 22.7%). Thus, TFA extraction was considered the most appropriate method to pretreat Vibrio species for MALDI-TOF MS. The remaining 33 isolates and two reference strains were prepared by TFA extraction and analyzed by MALDI-TOF MS. Overall, 50 isolates were identified to the species level (40/50, 80%) and to the genus level (10/50, 20%). All isolates were identified as 43 V. alginolyticus, six V. parahaemolyticus, and one V. vulnificus species. V. alginolyticus and V. parahaemolyticus were isolated from fish offal (87.5% and 12.5%, respectively), seawater (91.3%, 8.7%), and shellfish (62.5%, 37.5%), whereas V. alginolyticus and V. vulnificus were isolated from sediment (90.9% and 9.1%, respectively). This study established a reliable system of MALDI-TOF MS preparation and analysis for Vibrio identification.
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Kim, Youngjae,Kim, Minseuk,Sohn, Jungsoo,Park, Hyunsik Elsevier 2018 JOURNAL OF CLEANER PRODUCTION Vol.203 No.-
<P><B>Abstract</B></P> <P>Increasing concerns about environmental issues have led to more attention being paid to the recycling of mining wastes and smelting byproducts. In the present study, the utilization of gold tailings, waste limestone, red mud, and ferronickel slag was investigated for producing continuous glass fibers. To verify the applicability of the down-drawing process, the viscosity of the present mixture was measured in the molten state at a high temperature. The viscosity in the low temperature range was estimated using the Mauro–Yue–Ellison–Gupta–Allan equation. Compared to other commercially used basalt fiber systems, a similar fiber-forming temperature in the range of 1466 K–1503 K with viscosities ranging from log 2.5 to log 3.0 dPa s, was observed, which indicates the applicability of the down-drawing process. Measurements of the tensile strength and the Young's modulus of a single filament were carried out following standard test methods. In spite of the thick diameter of the present filament, the fiber produced in the present study exhibited a Young's modulus of 60 GPa–80 GPa, which was found similar to those of other commercial fibers. It is expected that a higher tensile strength will be achieved by reducing the diameter of the filament lower than 10 μm by increasing the drawing speed. Therefore, utilization of the present mixture; mining wastes and smelting byproducts, is feasible for producing continuous glass fibers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new recycling method for glass fibers is suggested. </LI> <LI> Mining wastes; gold tailing and waste limestone, and smelting byproducts; red mud and ferronickel slag, were utilized. </LI> <LI> The mechanical properties of the produced glass fiber were measured. </LI> <LI> Mechanical properties similar to those of basalt fiber were achieved. </LI> </UL> </P>
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Kim, Youngjae,Morita, Kazuki Elsevier 2017 Journal of non-crystalline solids Vol.471 No.-
<P><B>Abstract</B></P> <P>The thermal conductivity of Li<SUB>2</SUB>O-B<SUB>2</SUB>O<SUB>3</SUB>, Na<SUB>2</SUB>O-B<SUB>2</SUB>O<SUB>3</SUB> and K<SUB>2</SUB>O-B<SUB>2</SUB>O<SUB>3</SUB> glass systems was measured as a function of the temperature. As the temperature increases, the thermal conductivity of the glass phase initially increases and then reaches a plateau. Afterwards, in the liquid phases, a further increase in the temperature leads to a decrease in the thermal conductivity. The thermal conduction phenomenon can be better described by considering the glass and molten oxide systems as a one-dimensional continuum. It was found that the temperature corresponding to the highest thermal conductivity lies close to the one-dimensional Debye temperature (<I>Θ</I> <SUB> <I>D</I>1</SUB>). According to phonon gas model, the variables affecting the thermal conductivity were evaluated. Below <I>Θ</I> <SUB> <I>D</I>1</SUB>, the increase in heat capacity with the temperature leads to a corresponding increase in the thermal conductivity. The heat capacity then becomes constant above <I>Θ</I> <SUB> <I>D</I>1</SUB> leading to the observed plateau in the thermal conductivity of the glass phase. After melting the glass, the decrease in thermal conductivity with increasing temperature is due to changes in sound velocity and mean free path. The relative content of 3- and 4-coordinated boron was analyzed by <SUP>11</SUP>B MAS-NMR. The cation effect on the thermal conductivity of alkali borate glasses was evaluated through their ionization potentials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> By phonon gas model, variables determining thermal conductivity in the glassy and molten oxide system were evaluated. </LI> <LI> The glassy and molten oxide system was treated as a conducting medium of one-dimensional continuum. </LI> <LI> In the non-crystalline oxide system, maximum thermal conductivity could be found near one-dimensional Debye temperature. </LI> <LI> Effect of cation on thermal conductivity in the alkali borate system was evaluated through the ionization potential. </LI> </UL> </P>
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Kim, Sanghyeok,Park, Sungyoung,Kim, Youngjae,Kim, Siri,Lee, Kwonyong Springer-Verlag 2017 CLUSTER COMPUTING Vol.20 No.3
<P>With the advances of network function virtualization and cloud computing technologies, a number of network services are implemented across data centers by creating a service chain using different virtual network functions (VNFs) running on virtual machines. Due to the complexity of network infrastructure, creating a service chain requires high operational cost especially in carrier-grade network service providers and supporting stringent QoS requirements from users is also a complicated task. There have been various research efforts to address these problems that only focus on one aspect of optimization goal either from users such as latency minimization and QoS based optimization, or from service providers such as resource optimization and cost minimization. However, meeting the requirements both from users and service providers efficiently is still a challenging issue. This paper proposes a VNF placement algorithm called VNF-EQ that allows users to meet their service latency requirements, while minimizing the energy consumption at the same time. The proposed algorithm is dynamic in a sense that the locations or the service chains of VNFs are reconfigured to minimize the energy consumption when the traffic passing through the chain falls below a pre-defined threshold. We use genetic algorithm to formulate this problem because it is a variation of the multi-constrained path selection problem known as NP-complete. The benchmarking results show that the proposed approach outperforms other heuristic algorithms by as much as 49% and reduces the energy consumptions by rearranging VNFs.</P>
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Current Status of Knowledge and Research Perspectives in Korean Pear Genomics
( Youngjae Oh ),( Yoon Kyeong Kim ),( Daeil Kim ) 한국육종학회 2015 Plant Breeding and Biotechnology Vol.3 No.4
The pear (Pyrus spp.) is most important fruit crop in the world. The genus Pyrus belongs to the subfamily Maloideae in the Rosaceae family and contains at least 22 primary species; however, only a few species, including P. pyrifolia, P. ussuriensis, P. bretschneideri, and P. communis have been utilized for fruit production. In Korea, awareness of the importance of the fruit industry and fruit tree breeding is low, and there is little support for genetic and genomic studies of fruit trees. In foreign countries, studies have focused on obtaining genomic information of fruit crops and the development of important agronomic trait-related molecular markers, providing a genomic framework for fruit tree breeding. Although Korea does not actively participate in research on the genomics of fruit trees, it is not far behind other countries in terms of technology and is therefore still competitive in research and development. The resequencing of ‘Whangkeumbae’ and ‘Minibae’ pears has been performed using the Illumina Hiseq 2000 platform as a part of the Biogreen 21 project, offering novel, rapid methods for identification of molecular marker, such as single nucleotide polymorphisms, insertion-deletions, and simple sequence repeats, through next-generation sequencing (NGS) technology. These NGS-based molecular markers are useful for genetic studies of Asian pears, e.g., for construction of genetic linkage maps, mapping of quantitative trait loci, and marker-assisted selection.
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