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( Sukjung Choi ),( Gwi-deuk Jin ),( Jongbin Park ),( Inhwan You ),( Eun Bae Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.8
Lactobacillus plantarum is a lactic acid bacterium that promotes animal intestinal health as a probiotic and is found in a wide variety of habitats. Here, we investigated the genomic features of different clusters of L. plantarum strains via pan-genomic analysis. We compared the genomes of 108 L. plantarum strains that were available from the NCBI GenBank database. These genomes were 2.9-3.7 Mbp in size and 44-45% in G+C content. A total of 8,847 orthologs were collected, and 1,709 genes were identified to be shared as core genes by all the strains analyzed. On the basis of SNPs from the core genes, 108 strains were clustered into five major groups (G1-G5) that are different from previous reports and are not clearly associated with habitats. Analysis of group-specific enriched or depleted genes revealed that G1 and G2 were rich in genes for carbohydrate utilization (L-arabinose, L-rhamnose, and fructooligosaccharides) and that G3, G4, and G5 possessed more genes for the restrictionmodification system and MazEF toxin-antitoxin. These results indicate that there are critical differences in gene content and survival strategies among genetically clustered L. plantarum strains, regardless of habitats.
Dimensional Stability of Bentwoods by Treatment Conditions
In-SukJung,이원희,장준복,배현미 한국목재공학회 2002 목재공학 Vol.30 No.3
This study was carried out to investigate the dimensional stability of bentwoods by three treatments: steaming, urethane varnish coating, and polyethylene glycol (PEG) treatment. Bentwood processing employed a bending-jig with only 4 cm radius of curvature (ROC). The used species were bitter wood (Picrasma quassioides), painted maple (Acer mono), and birch (Betula schmidtii). The bending properties of these are well-known in bentwood production (Jung et al., 2002). The bentwoods were treated repeated at room temperature [20oC, RH 80% (12 hours) and 40oC under RH 10% (12 hours)]. To estimate the dimensional stability of bentwoods, we measured the radius of curvature and end-distance. The best results could be attained with PEG treatment. Steaming was the worst treatment. Comparing the properties of the different species, the dimensional stability of bitter wood was excellent. It was concluded that the steaming treatment was unsuitable for dimensional stability of bentwoods.
In-SukJung,이원희 한국목재공학회 2002 목재공학 Vol.30 No.3
This study was carried out to estimate the property of dimensional stability of heat compression of italian poplar wood with low density. Firstly, two levels of pressure conditions were applied using the closed and open-press system. The thermal treatment temperatures were 180oC and 200oC, respectively. Water absorption tests were conducted in water bath at 25oC and 100oC for 35 hours and 1 hour, respectively. The compression rates of wood were 47 percent, 60 percent, and 73 percent, respectively. From these tests, it was found that the dimensional stability of the closed-press system was superior to that of the open-press system. Furthermore, the dimensional stability of compressed wood in the closed-press system was better at 200oC than 180oC. In compression rate, dimensional stability of 73 percent compression rate was the best result. Considering these results, the best conditions for the dimensional stability of compressed wood were those of the closed-compressing system at high temperatures above 200oC and larger compression rate. Therefore, it was concluded that the dimensional stability of wood is improved at higher temperature and larger deformation.
배석정(Sukjung Bae),김진수(Jinsu Kim),허형석(Hyungseok Heo),서재수(Jaeso Seo),김종근(Jongkeun Kim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The heat transfer of the evaporator of a vehicle air-conditioning system is directly related to the system cooling performance, which serves to export the cooled air into cabin. Recent technology of heat exchangers for vehicle air conditioning system has been developed in aspects such as densification of the heat transferring fins, compact design of slits and louvers, and high air flow design, which yields the necessity of the technology to keep the air flow resistance in control. In this study, the structure of louvered fin of the evaporator has been modified from the conventional one to form wavy geometries to improve the drainage. An air flow analysis has been conducted to analyze the pressure drop or the distribution of the flow.
엔진 냉각수 폐열 회수를 위한 ORC 시스템 및 폐열 회수 열교환기 설계
배석정(Sukjung Bae),허형석(Hyungseok Heo),황재순(Jaesoon Hwang),박정상(Jeongsang Park),이홍열(Hongyeol Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A 2-loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of a gasoline vehicle has been established. A high temperature loop system is used to recover waste heat from exhaust gas, and a low temperature loop system is used for heat recovery from the relatively cold engine coolant. This paper has dealt with a layout of an low temperature loop system, a review of the working fluids, and the design of the cycle. R1234yf has been chosen as the working fluid. The design point and the target heat recovery of the LT boiler, a core heat exchanger for the organic Rankine cycle, has been presented and analytically investigated. Considering the characteristics of the cycle, the basic concept of the heat exchanger has been determined to be a shell-and-tube type counter flow heat exchanger. The performance characteristics for various design parameters were investigated.
특성 방법을 이용한 Fuel Rail 압력맥동 특성 해석 프로그램 개발
배석정(Sukjung Bae),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),송경석(Kyungsuk Song),박시우(Seewoo Park),김보겸(Bokyoum Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the return less fuel rail system of MPI engine, pulsation damper is commonly mounted for the purpose of diminution of pressure pulsations and jarring noise. But, pulsation damper is too expensive for all the advantage. Therefore, the studies are on the increase to develop fuel rail to diminish pulsations with integrated damping effect. This paper deals with numerical approach using method of characteristics to design fuel rail to reduce pulsations with self-damping effect. Primarily, the pressure pulsation characteristics is investigated with aspect ratio of cross section, wall thickness, and materials of fuel rail. Secondarily, sweep test simulation of fuel rail for in-line engine is performed as engine speed increases to find out certain engine speed where pressure pulsation peak is observed. A high aspect ratio or thin wall is found to absorb the pressure pulsations effectively. The fuel rail made of aluminum is effective for reduction of pressure pulsation than that of low-carbon steel. Pressure pulsation peak is observed at the vicinity of certain engine speed where single-injector oil hammer simulation predicts that resonance would occur.
배석정(Sukjung Bae),허형석(Hyungseok Heo),이현석(Hyunseok Lee),이병호(Byungho Lee),김영삼(Youngsam Kim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Efficient thermal management system of electric vehicle is a crucial issue in views of energy consumption and balance in that its electric cabin heater reduces the charging range by 20 to 50 percent in the winter season. Carbon material is employed to develop a highly efficient cabin heater for electric vehicle, which is never been attempted at home and abroad. With its high thermal conductivity, carbon nanutube(CNT) heater can improve heat-up rate and reduce power consumption compared to conventional positive temperature constant(PTC). Carbon nanotube heater is superior in terms of reduced power consumption, stable heating, rapid heating rate to improve indoor comfort and winter defrosting function, weight reduction, durability and reliability. In this study, various carbon film heater patterns has been designed and tested in order to grasp the heat-up behaviors and search the optimal pattern design. Performance assessment of heating-up of carbon heating film has been carried out in comparison with conventional PTC stone for cabin heater. Carbon nanotube film presented prominent heat-up performance than the conventional heater element to a certain temperature criterion.