• Journal of Conservation Science
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• v.27 no.3
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• pp.323-332
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• 2011

Microtexture and components of 7 glass bead fragments excavated from Andong tumulus in Gildu-ri, Goheung have been analyzed to determine the characteristics of their weathered condition as well as chemical compositions. Firstly, status of microtexture shows that there is a large quantity of pollutants which were presumably transferred from the buried environment into the surface and the gap of the cracks. The examination has displayed that there are less amount of alkali metal components such as sodium (Na) and potasium (K) in the gap of the cracks than on the surface. The chemical compositions analysis has confirmed that two samples belongs to potash glass group ($K_2O-SiO_2$), four to soda glass group ($Na_2O-SiO_2$), and one to the mixed alkali glass group. Chromophoric elements of the glass varies by different colours: blue and navy are cobalt (Co); greenish blue is copper (Cu) and iron (Fe); and light brown is Fe respectively. Such kind of scientific analysis of the excavated glass beads will contribute to the understanding of interchange between various local cultures and arts within the southwest region of Korean Peninsula during the 4th and the 5th centuries.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.2
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• pp.193-200
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• 2006

Geographic information and surveying products are a momentous national infrastructure since it is an essential basis for land management and environmental preservation. Hence, it is necessary to set up a systematic plan and countermeasure for the upcoming unification of Korea. Otherwise there would be tremendous confusion and it will cause enormous expenses to establish the national surveying and geographical information standard. In order to show the vision of policies preparing for the unification of North and South Korea, we analyzed the case of Germany and the current status of surveying and Geographical Information in South and North Korea by taking the internet investigation, having a seminar, interviewing experts, and visiting related organizations. First of all, we should predict the change of surveying circumstances after the reunification and establish a plan that unifies laws, systems, and surveying standards of North and South Korea. We need to modify the datum point and unify the surveying product of South and North Korea in World Geodetic System. To accomplish these goals, we must make the map of Korean peninsula and neighboring nations, especially urban area of North Korea. It is considered that National Geographic Information Institute should take a major role in the unification of Korea. With these active preparations and plans, we will achieve the goals of establishing the reinforced surveying policy and minimizing the reunification expenses.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.10 no.2
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• pp.63-71
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• 1992

The digital map database is often produced for multiple purposes, including mapping at multiple scales; it is increasingly rare that a base map is digitized for mapping at a single scale. The most important problems in process of line simplification in map generalization and multiple representation is that tolerance value selected for simplifying base map information must be modified as feature geometry varies within the digital file to ensure both accuracy and recognizability of graphic details on a generalized map. In this study, we explored various algorithms regarding to line simplication at many scales from a single digital file, and presents a rule by which to determine those scale at which line feature geometry might be expected to change in map representation. By applying two measured of displacement between a digitized line and its simplification, five algorithms have been evaluated. The results indicate that, of the five, the Douglas-Peucker routine produced less displacement between a line and its simplification. The research has proved to automating map simplification, incorporating numeric guidelines into digital environment about what magnitude and variation in geometric detail should be preserved as the digital data is simplified for representation at reduced map scales.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.7
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• pp.584-592
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• 2006

This study was conducted to investigate the effects of sowing date on yield component and yield in sprout-soybean. Six sprout-soybean cultivars were planted on three sowing dates in 2000 and 2001. 100-seed weight, number of seeds per pod, number of seeds, number of pods per plant, and ratio of empty pods distinct differences between sowing dates and cultivars. All yield components except the 100-seed weight and number of seeds per pod diminished recording where the sowing day will be late. The ratio of pods with two or three seeds was 77.5 from 80.9 percents. The ratio of two-seed pods were affected by sowing date. The yield of soybean of May 25 sowing was 290 kg/10a followed by June 15 and July 5 sowing with 269 kg/10a and 221 kg/10a, respectively Late sowing greatly decreased the yield of Doremikong, while yields of Tawonkong were more a less stable. In 2000, yield showed positive correlation with number of branches, number of pods per plant, number of seeds per plant, dry weight, leaf area, and oil content. While yield of 2001 showed positive correlation with number of nodes on main stem, stem thickness, number of pods per plant, dry weight, and leaf area.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.7
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• pp.608-617
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• 2006

This study was conducted to investigate the effects of sowing date on soybean-sprout growth characters and for improving cultural techniques to produce high quality soybean-sprout. Six sprout-soybean cultivars were planted on three sowing dates in 2000 and 2001. The growth of hypocotyl in soybean sprouts was accelerated at higher temperature and the differences among cultivars became greater at later culture days. The longest of hypocotyl and root lengths of soybean sprouts was obtained from July 5 sowing, followed by May 25 and June 15 sowing. Doremikong and Hannamkong had the thickest and the thinness hypocotyls, respectively. Total length of soybean-sprouts was longer in seeds harvested from later sowing, respectively. Eunhakong produced the longest soybean-sprouts, while Tawonkong produced the shortest. Percentage of rotten seed and imperfectly germinated seed harvested at later sowing was lower. Somyeongkong and Tawonkong showed the highest and the lowest percentages of rotten seeds, respectively, while Pungsannamulkong and Hannamkong showed the lowest and the highest percentages of imperfectly germinated seeds. The soybean-sprouts yields were higher in seeds harvested in 2001 and later sowing. Although Eunhakong and Doremikong showed higher soybean-sprout yield, Pungsannamulkong and Somyeongkong showed stable soybean-sprout yield regardless of the sowing dates.

• Journal of the Korean Regional Science Association
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• v.31 no.2
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• pp.79-100
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• 2015

In spite of the various government policies to increase the jobs and to improve the employment environment, the unemployment rate has not reduced. The aims of this study are to analyze the structural mismatch(especially geographical mismatch) between job opening and job seeking, and thus to comprehend more deeply the factors affecting unemployment rates of economic regions in Korea. For the period of 2008~2013, the unemployment rates caused by geographical mismatches between job opening and job seeking have been increased steadily. For Chungcheong, Dongnam and Honam economic region, geographical mismatches of low-educated and low-skilled jobs showed relatively quite high, indicating that the job seeker have a strong tendency of preferring certain areas in looking for their jobs. It means that the job seeker can get a job only to move the other areas within an economic region. However, for Capital region, which is the largest job seekers in Korea, geographical mismatches in all types of jobs showed very quite low. So, it is very difficult for the job seeker to escape from unemployment when changing the other areas in looking for a job in Capital region. The results of this study gives an important implication that a nationwide uniform unemployment policy may not be effective to reduce unemployment conditions, and a differentiated unemployment policy should be established in considering the characteristics of geographic mismatches by the types of job in terms of the level of education and skill for each economic region.

• Research in Plant Disease
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• v.8 no.1
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• pp.1-10
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• 2002

Climate in the year of 2001 could be summarized as severe drought from March to May, unusually high temperature in whole plant growth periods and clear weather condition especially in harvesting time of September and October without any typoons. In rice, major diseases such as leaf and panicle blast, bacterial blight, sheath blight and bacterial grain rot developed little due to unfavorable weather conditions, however, brown spot occurred severely due partly to the reduced use of N-fertilizer, Rice stripe virus infection was unusually high mainly in the west coast areas with four times more diseaseD area campared to the previous year, In pepper phytophthora blight was extremely severe in Cheonnam and Cheonbuk provinces, where had frequent rainfalls during growing period. Incidence of major diseases of tomato and cucumber in 2001 was relatively mild. In watermelon, penicillium fruit rot, one of the peculiar disease, spread over major production areas, whereas CGMMV, usually severe in every years was much reduced. Watermelon plants growing in open-fields were more severely diseased than those in plastic houses. Major diseases of chinese melon and strawberry occurred slightly and in particular, sudden wilt syndrome of chinese melon which was severe in 2000 showed mild infections in 2001. Incidence of white rot of garlic and onion was much lower unlike other years due mainly to spring drought and high temperature in the growing period. Infected area of potato bacterial wilt tended to increase in 2001 while fusarium wilt of sweetpotato was decreased. Apple diseases were generally mild, but powdery mildew of pear increased sharply. Barley scab was not severe as seen in other years.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.3
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• pp.382-390
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• 1995

To compare the rice yield and grain quality characteristics between mature(MPF) and reclaimed paddy field(RPF), grain yield and its components, some physicochemical properties of rice grain and palatability of cooked rice were investigated for Dongjinbyeo grown at three different locations of mature and reclaimed paddy field, respectively, in south western part of Korea. Variation of culm length in mature paddy area was larger than that in reclaimed saline area. Panicle number per m$^2$ in RPF was more then that in MPF but grain number per m$^2$, filled grain ratio and 1, 000-grain weight in RPF were lower than those in MPT. Average yield of milled rice in RPF was 12% lower than that in MPF (5.l1t /ha). Daejeon showed the highest yielding among MPF and Yeongam reveald the highest grain production among RPF. RPF rices had slightly higher carbohydrate content and alkali digestibility but lower protein, fat and amylose content compared with MPF rices. RPF rices also exhibited higher mineral contents, Mg/K ratio, peak and hot viscosity compared with MPF rices. RPF rice showed slightly poor apparent grain quality but a little better eating quality of cooked rice compared with MPF rice.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.56 no.2
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• pp.140-145
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• 2011

In order to establish the application method of slurry composting & biofilteration liquid fertilizer (SCB LF) in rice cultivation, experiments were studied on split application method of it and effects of it on soil chemical properties and rice yields. Land leveling by rotary tillage within 2 days after application of SCB LF, $NH_4$-N concentration in soil was maintained uniformly in all paddy field. Initial concentrations of $NH_4$-N and $NO_3$-N in soil were high at standard fertilization and 100% application of SCB LF as basal fertilization, however, after tillering stage they maintained similar concentrations in all experimental plots. $NO_3$-N content in infiltration water was slightly lower at 70% application of SCB LF as basal fertilization and 30% application of SCB LF as fertilization at panicle initiation stage than at standard fertilization. Yields of rice by split application of SCB LF were lower at 100% application of SCB LF as basal fertilization, however, those of the other application of SCB LF were similar with that of standard fertilization. In case of rice quality, perfect kernel rates were high and protein contents were lower at non-application and 100% application of SCB LF. Rice quality of 70% application of SCB LF as basal fertilization and 30% application of SCB LF as fertilization at panicle initiation stage were similar with that of standard fertilization.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.42 no.5
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• pp.528-533
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• 1997

This experiment was conducted to determine the effects of cutting height on the yield and nutritive value of brittle culm rice. A brittle culm cultivar, KL501, was compared with a non-brittle culm rice, Seomjinbyeo. The cultivars were grown in paddy until flowering stage at which the first cutting was made followed by the second cutting on October 20. Cutting regime conducted were 0, 5, 10 and 20cm from the surface. Herbage yield, TDN and other nutritive values were measured. As the higher cutting height, crude protein, fat and NFE (nitrogen free extract) contents were increased and crude fiber and ash content were decreased at the first cutting, while those at second cutting were increased except NFE content. Fresh and dry matter yield at 10cm cutting height, Seomjinbyeo was 4.45 and 1.16t /ha, KL501 was 4.71 and 1.14t /ha, respectively. TDN content of first cutting was increased as the higher cutting height, but that of second cutting was decreased. TDN yields of Seomjinbyeo and KL501 at 10cm cutting height were highest by showing 0.63t /ha and 0.61t /ha, respectively.