The demand for an environment-friendly transportation system, equipped with low energy consumption, and low-or zero-pollution has been on the increase since the beginning of the World Trade Organization era. Simultaneously, the consistent growth of high-speed tram technology, combined with market share, has sparked a fierce competition among technologically-advanced countries like France, Germany, and Japan in an effort to keep the lead in high-speed train technology via extensive Research and development(R&D) expenses. These countries are leaders in the race to implement the next-generation transportation system, build intercontinental rail way networks and export the high-speed train as a major industry commodity. The need to develop our own(Korean) 'high-speed train' technology and its core system technology layouts including original technology serves a few objectives: They boost the national competitive edge; they develop an environmental friendly rail road system that can cope with globalization and minimize the social and economic losses created by the growing traffic-congested delivery costs, environment pollution, and public discomforts. In turn, the 'G7 Project-Development of High Speed Railway Technology' held between 1996 and 2002 for a six-year period was focused on designing a domestic train capable of traveling at a speed of 350km/h combined and led to the actual implementation of engineering and producing the '2000 high-speed train:' This paper summarizes and introduces one of the G7 Projects-specifically, the design segment achievement within the development of train system engineering technology. It is true that the design aspect of the Korean domestic railway system program as a whole was lacking when compared with the advanced railroad countries whose early phase of train design emphasized the design aspect. However, having allowed the active participation of expert designers in the early phase of train design in the current project has led to a new era of domestic train development and the implementation of a way to meet demand flexibly with newly designed trains. The idea of a high-speed train in Korea and its design concept is well-conceived: a faster, more pleasant, and silent based Korean high-speed train that facilitates a new travel culture. A Korean-type of high-speed train is acknowledged by passengers who travel in such trains. The Korean high-speed prototype train has been born, combining aerodynamic air-cushioned design, which is the embodiment of Korean original design of forehead of power car minimized aerodynamic resistance using a curved car body profile, and the improvement of the interior design with ergonomics and the accommodation of the vestibule area through the study of passenger behavior and social culture that is based on the general passenger car.
A feeding trial was conducted with Euglena strains grown under different media. The effect of supplementation of Euglena on the performance, nutrient availability and fatty acid composition of breast muscle was studied. In experiment I, two hundred ten hatched broiler chicks (Ross) were assigned to seven dietary treatments for 5 weeks. Each treatment consisted of 3 replications with 10 birds each. Control diet was formulated to have $22\%$ CP and 3,150 kcal ME/kg for starter diet, $19\%$ CP and 3,200 kcal ME/kg for finisher diet. Euglena gracilis Z. (EG) was added to control diet at the plevel of 0.25, 0.5, $1.0\%$ and Euglena gracilis Z. bleached and DHA enriched (EGBD; a strain mutated by streptomycin and cultivated in DHA enriched medium) at the level of 0.5, 1.0, $2.0\%$ in the diet. In experiment 2, two hundred fifty hatched broiler chicks (Ross) were assigned to five dietary treatments: T1; Control, T2; T1 + Euglena gracilis Z. DHA enriched (EGD; cultivated in DHA enriched medium) $0.5\%$, T3; T1 + EGD $1.0\%$, T4; T1 + EGBD $0.5\%$, T5; T1 + EGBD $1.0\%$. The weight gain and feed consumption were measured weekly. Fatty acid composition of breast muscle was determined. In experiments I and 2, Euglena supplementation had no significant effects on weight gain, feed intake and feed conversion ratio. In experiment 1, EGBD treatments significantly increased DHA concentration but decreased concentration of linoleic acid and arachidonic acid in breast muscle. EGBD 2% treatment showed the highest DHA concentration (14.27%) which is 3.9 times of that of the control ($3.66\%$). In experiment 2, $1.0\%$ EGBD treatment showed highest EPA, lignoceric acid and DHA level in breast muscle (P<0.05). Also, EGD treatments significantly increased DHA and EPA concentration. It was concluded that EGBD and EGD can be supplemented to broiler diet to produce DHA enriched broiler meat.
The Miwon-Boeun area in the central and northern part of Okcheon metamorphic zone, Korea, is composed of Okcheon Supergroup and Mesozoic Cheongju and Boeun granitoids which intruded it. The Okcheon Supergroup consists mainly of quartzite (Midongsan Formation), meta-calcareous rocks (Daehyangsan Formation, Hwajeonri Formation), meta-psammitic rocks (Unkyori Formation), meta-politic rocks (Munjuri Formation), meta-conglomeratic rocks (Hwanggangni Formation) in the study area, showing a zonal distribution of NE trend. Its' general trend is locally changed into NS to EW trend in and around high-angle fault of NS or NW trend. This study focused on deformation history of the Okcheon Supergroup, suggesting that the geological structure was formed at least by four phases of deformation. (1) The first phase of deformation occurred under ductile shear deformation of top-to-the southeast movement, forming sheath fold or A-type fold, asymmetric isoclinal fold, NW-SE trending stretching lineation. (2) The second phase of deformation took place under compression of NW-SE direction, forming subhorizontal, tight upright fold of M trend in the earlier phase, and formed semi-brittle thrust fault (Guryongsan Thrust Fault) of top-to-the southeast movement and associated snake-head fold in the later phase. (3) The third phase of deformation formed subhorizontal, open recumbent fold through gravitational or extensional collapses which might be generated from crustal thickening and gravitational instability. (4) The fourth phase of deformation formed moderately plunging, steeply inclined kink fold related to high-angle faulting, being closely connected with the local change of NE-trending regional foliation into NS to EW direction of strike in the vicinity of the high-angle fault.
Park, J.;Moon, Y.J.;Kim, K.H.;Cho, K.S.;Kim, H.D.;Kim, Y.H.;Park, Y.D.;Yi, Y.
Journal of Astronomy and Space Sciences
/
v.24
no.2
/
pp.125-134
/
2007
In this paper, we analyze the orbital variation of the Korea Multi-Purpose SATellite-1(KOMPSAT-1) in a strong space environment due to satellite drag by solar and geomagnetic activities. The satellite drag usually occurs slowly, but becomes serious satellite drag when the space environment suddenly changes via strong solar activity like a big flare eruption or coronal mass ejections(CMEs). Especially, KOMPSAT-1 as a low earth orbit satellite has a distinct increase of the drag acceleration by the variations of atmospheric friction. We consider factors of solar activity to have serious effects on the satellite drag from two points of view. One is an effect of high energy radiation when the flare occurs in the Sun. This radiation heats and expands the upper atmosphere of the Earth as the number of neutral particles is suddenly increased. The other is an effect of Joule and precipitating particle heating caused by current of plasma and precipitation of particles during geomagnetic storms by CMEs. It also affects the density of neutral particles by heating the upper atmo-sphere. We investigate the satellite drag acceleration associated with the two factors for five events selected based on solar and geomagnetic data from 2001 to 2002. The major results can be summarized as follows. First, the drag acceleration started to increase with solar EUV radiation with the best cross-correlation (r = 0.92) for 1 day delayed F10.7. Second, the drag acceleration and Dst index have similar patterns when the geomagnetic storm is dominant and the drag acceleration abruptly increases during the strong geomagnetic storm. Third, the background variation of the drag accelerations is governed by the solar radiation, while their short term (less than a day) variations is governed by geomagnetic storms.
Current feeder system (CFS) for Korea superconducting tokamak advanced research(KSTAR) project plays a role to interconnect magnet power supply (MPS) and superconducting (SC) magnets through the normal bus-bar at the room temperature(300 K) environment and the SC bus-line at the low temperature (4.5 K) environment. It is divided by two systems, i.e., toroidal field system which operates at 35 kA DC currents and poloidal field system wherein 20$\sim$26 kA pulsed currents are applied during 350 s transient time. Aside from the vacuum system of main cryostat, an independent vacuum system was constructed for the CFS in which a roughing system is consisted by a rotary and a mechanical booster pump and a high vacuum system is developed by four cryo-pumps with one dry pump as a backing pump. A self interlock and its control system, and a supervisory interlock and its control system are also established for the operational reliability as well. The entire CFS was completely tested including the reliability of local/supervisory control/interlock, helium gas leakage, vacuum pressure, and so on.
Back J. J.;Park C. K.;Yang B. K.;Kim C. I.;Cheong H. T.
Reproductive and Developmental Biology
/
v.29
no.3
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pp.175-180
/
2005
This study was conducted to examine the effects of demecolcine-assisted enucleation and recipient cell cycle stage on the development of bovine somatic cell nuclear transfer (NT) embryos. In vitro cultured oocytes for $16\~20$ h were classified by first polar body (1st PB) extrusion and cell cycle stage (MI and MII) and treated $0.4\;{\mu}L/mL$ demecolcine for 40 min before enucleation. Enucleated oocytes were fused electrically with bovine ear skin cells, activated by Ca-ionophore+DMAP, and cultured in vitro. Most of eggs ($86.2\%$) treated with demecolcine protruded a chromosome mass and enucleated efficiently ($98.8\%$, (P<0.05). Demecolcine did not have a deteriorative effect on the development of NT embryos. Developmental rate of NT embryos reconstituted with oocytes extruded 1st PB significantly higher than that of NT embryos produced by oocytes without 1st PB ($18.2\%\;vs.\;4.6\%\cdot$, P<0.05). Cleavage and blastocyst formation rate of embryos reconstituted with MI oocytes ($69.4\%\;and\;5.9\%$, respectively) were significantly lower than those of embryos reconstituted with MII oocytes ($96.7\%\;and\;23.9\%$, respectively, P<0.05). From the present result, it is suggested that domecolcine is useful for the enucleation of recipient oocytes in bovine NT procedures, and MII oocytes rather than MI oocytes are more appropriate for recipient cytoplasm. Although, the potential to develop into blastocysts of NT embryos produced by 1st PB-nonextruded and MI oocytes was very low, these oorytes could be used for NT.
The current study was conducted to determine the relationships of vitamin A on meat quality of Hanwoo as a basic study to manipulate vitamin A contents in feeds to produce high quality beef. Concentrations of vitamin A in serum and liver of Hanwoo steers(n=328) were analyzed and correlation coefficients with carcass properties were evaluated. Mean vitamin A concentration in the serum of Hanwoo steers in the early fattening period was 212.0$\pm$32.7 IU/dl, and that in the late fattening period was 117.56$\pm$43.15 IU/dl. Mean vitamin A concentration in the liver of Hanwoo steers in the late fattening period was 143.62$\pm$110 IU/g expressing large variations might be depended on animals, feeds and farms. There were negative correlations between serum vitamin A concentration and marbling degree(r=-0.24, P<0.01), fat contents in M. Logissimus dorsi (r=-0.21, P<0.01), and beef quality grade(r=-0.20, P<0.01). Vitamin A-palmitate in liver also expressed negative correlations with fat contents in M. Logissimus dorsi (r=-0.18, P<0.01) and beef quality grade(r=-0.16, P<0.05). From the results obtained in the current study, we concluded that it might be possible to produce high quality beef in Hanwoo by manipulating vitamin A contents in the feeds. Further detailed studies, however, are necessary to determine vitamin A contents in feeds, feeding levels, and feeding periods.
The early Joseon Dynasty is very important period of studying about Korean history of ceramics because various kinds of porcelain were produced like celadon, brown porcelain, white porcelain, inlaid white porcelain, blue porcelain etc, $\ulcorner$sejongsilrok$\lrcorner$$\ulcorner$Jiriji$\lrcorner$ was published and Saongwon established its branch. Moreover, there also had a sudden political change to Joseon Dynasty, so ceramic industry in Gangjin was closed and artisans in Gangjin scattered to find safer place. One of these place was Imiwueri and Chuhyunri, Joongmohyun in Sangju.(the name of the place in that times, now Modongmyun) Also, Sangju in Gyeongsangbuk-Do is one of the places where can get materials for producing white porcelain, so artisans in Gangjin could migrate to the place during change of regime to Joseon Dynasty which based on Sung Confucianism. In $\ulcorner$Tejongsilrok$\lrcorner$, it mentioned specific areas like Joongmo, Hwaryeong in Sangju, Gyeongsang-Do and we can find out about situations of ceramic production in the early 15 centuries with producing dishes for a Royal family. $\ulcorner$Sejongsilrok$\lrcorner$$\ulcorner$Jiriji$\lrcorner$ mentioned Imiwueri and Chuhyunri and Sangju produced the half of porcelains. In $\ulcorner$Gyeongsangdojiriji$\lrcorner$, Sangju takes charge of 8 spots which is one third of ceramic production. $\ulcorner$Gyeongsangdojiriji$\lrcorner$ and $\ulcorner$Sejongsilrok$\lrcorner$$\ulcorner$Jiriji$\lrcorner$ were published with same goals at the same year. In $\ulcorner$Gyeongsangdosokchanjiriji$\lrcorner$, there was deleted nine spots which included high, middle, low level compared with $\ulcorner$Seiongsilrok$\lrcorner$$\ulcorner$Jiriji$\lrcorner$, and in $\ulcorner$Donggukyeojiseungram$\lrcorner$ there was entirely deleted the locations of porcelain spots and potteries.
Water environment and freshwater algae were studied in the upstream of the Tamjin River Dam. Among the environmental factors, DO concentration in the Tamjin River ranged from 9.0 mg $O_2/l$ to 9.2 mg $O_2/l$, pH from 7.0 to 7.1 and conductivity from $98{\mu}S/cm$ to $100{\mu}S/cm$. Average concentration of $NH_4$ and $NO_3$ ranged from $40{\mu}g\;N/l$ to $56{\mu}g\;N/l$ and from $489{\mu}g\;N/l$ to $611{\mu}g\;N/l$, respectively. $NO_3$ was more plentiful above 9~15 fold than that of $NH_4$. Average concentrations of soluble reactive phosphorus and soluble reactive silicon were $2{\mu}g\;P/l$ and 1.6 mg Si/l, respectively. Particulaly, Si nutrient increased by heavy rain events during summer season. The ratios of N/P and Si/P ranged from 248 to 261 and from 640 to 740, respectively. It is assumed that P would be limiting nutrient on the freshwater algal growth. Average content of planktonic chlorophyll-a ranged from $5{\mu}g/l$ to $13{\mu}g/l$. Mean contents of chlorophyll-a, phaeo-pigment and ash-free dry matter of periphyton were $50.3mg/m^2$, $11.9mg/m^2$, $11.5g/m^2$ in the main stream and $30.1mg/m^2$, $5.6mg/m^2$, $7.8g/m^2$ in the tributary. By comparison of the epilithon biomass, the main stream was higher with 1.5~2.1 fold than the tributary. The impotant algae were composed of diatom Achnanthes linearis, A. minutissima, Fragilaria crotonensis, Gomphonema gracile, Tabellaria flocculosa and blue-green algae Microcystis aeruginosa. In the relative abundance of the phytoplankton and epilithon, the serial dominance were diatom > green algae > blue-green algae, and diatoms were very abundant in comparison with other algal phylum.
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
/
v.10
no.3
/
pp.189-197
/
2012
Geochemical composition of fracture filling minerals and groundwater was investigated to characterize geochemical characteristics of groundwater system at the KURT site. Minerals such as calcite, illite, laumontite, chlorite, epidote, montmorillonite, and kaolinite, as well as I/S mixed layer minerals were detected in the minerals extracted from the fracture surfaces of the core samples. The groundwater from the DB-1, YS-1 and YS-4 boreholes showed alkaline conditions with pH of higher than 8. The electrical conductivity (EC) values of the groundwater samples were around $200{\mu}S/cm$, except for the YS-1 borehole. Dissolved oxygen was almost zero in the DB-1 borehole indicating highly reduced conditions. The Cl- concentration was estimated around 5 mg/L and showed homogeneous distribution along depths at the KURT site. It might indicate the mixing between shallow groundwater and deep groundwater. The shallow groundwater from boreholes showed $Ca-HCO_3$ type, whereas deep groundwater below 300 m from the surface indicated $Na-HCO_3$ type. The isotopic values observed in the groundwater ranged from -10.4 to -8.2‰ for ${\delta}^{18}O$ and from -71.3 to -55.0‰for ${\delta}D$. In addition, the isotope-depleted water contained higher fluoride concentration. The oxygen and hydrogen isotopic values of deep groundwater were more depleted compared to the shallow groundwater. The results from age dating analysis using $^{14}C$ indicated relatively younger (2000~6000yr old) groundwater compared to other european granitic groundwaters such as Stripa (Sweden).
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