• Journal of Korean Society of Transportation
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• v.35 no.2
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• pp.129-142
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• 2017

Accident Black Spot Improvement Project is the representative road safety intervention to eliminate environmental risk factors on the roadway by installing road safety facilities. Although it is one of the main road safety projects in Korea, there has been a lack of effort analyzing the traffic accident reduction effects of this project. In this study, therefore, we selected 4,171 road black spots from 2004 to 2013 and investigated the traffic accident reduction effects of 5 road safety facilities by using "Comparison Group(C-G)" method. Through the analysis, it was found that the number of traffic accidents were lowered by 4.45% with traffic islands, 32.17% with road paved markers, and 24.13% with speed cameras, respectively. However, 0.61% with pedestrian fencing and 1.67% with skid resistant pavement were increased on the other hand. In addition, we also analyzed traffic accident reduction facilities' performance on specific types of collision mentioned in manual on road safety facilities by Ministry of Land, Infrastructure and Transport. It was shown that the number of bad weather traffic accidents were reduced by 52.96% with road paved markers, pedestrians accidents were reduced by 62.77% with pedestrian fencing and rear-end collisions were reduced by 26.00% with skid resistant pavement.

• Research in Plant Disease
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• v.15 no.3
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• pp.183-186
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• 2009

Leaf spot symptoms were observed in a commercial Palenopsis cultivated fields. Circular-elliptical watersoaked spots surrounded by a light green or yellow halo and turned to black when it was severe infection or blacken with gathered symptoms. These spots were finally enlarged to form of larger areas. Under the favorable conditions of temperature and moisture, the infection extended rapidly and dispersed to the crown and sometimes the infected plant became dead. A bacterial organism, isolated from the advancing margins of the lesions, was tested to characterize causing bacterium based on pathogenicity. The biochemical and physiological tests of that bacterium identified that as an Acidovorax avenae subsp. cattleyae. Therefore, we suggested to call that the new Phalaenopsis disease was bacterial brown spot caused by A.avenae subsp. cattleyae in Korea.

• Journal of Korean Society of Transportation
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• v.27 no.4
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• pp.103-113
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• 2009

Quick accident spot reaching of 119ERU is the most important role in decrease of accident depth. If 4 minutes of wounded person pass after cardiac arrest, brain damage is begun. and If 10 minutes of wounded person pass after cardiac arrest, possibility to die rises. Accordingly, when establish 119ERU, need to consider travel time to traffic accidents spot. This treatise groped a facility location problem using SCLM and minisum location problem mutually. And existent minisum location problem has a problem that maximum travel time exceed $\lambda$. ERU to need in present situation and also can reduce average travel time. so this treatise propose modified minisum location problem. In case applying modified minisum location theory, 119ERU can arrive all demand and that is optimized about demand and travel time. Can minimise figure of 119 first aids to need in present situation applying this way, and also can reduce average passing time. Finally, this way can minimise figure of 119ERU to need in present situation and also can reduce average travel time.

• The Bulletin of The Korean Astronomical Society
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• v.40 no.1
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• pp.43.1-43.1
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• 2015

We have discovered an unexplored population of galaxies featuring weak broad-line regions (BLRs) at z < 0.2 from detailed analysis of galaxy spectra in the Sloan Digital Sky Survey Data Release 7. These objects predominantly show a stellar continuum but also a broad $H{\alpha}$ emission line, indicating the presence of a low-luminosity active galactic nucleus (AGN) oriented so that we are viewing the central engine directly without significant obscuration. These accreting black holes have previously eluded detection due to their weak nature. The new BLR AGNs we found increased the number of known type 1 AGNs by 49%. Some of these new BLR AGNs were detected at the Chandra X-ray Observatory, and their X-ray properties confirm that they are indeed type 1 AGN. Based on our new and more complete catalogue of type 1 AGNs, we derived the type 1 fraction of AGNs as a function of [OIII] ${\lambda}5007$ emission luminosity and explored the possible dilution effect on the obscured AGN due to star-formation. The new type 1 AGN fraction shows much more complex behavior with respect to black hole mass and bolometric luminosity than suggested by the existing receding torus model. The type 1 AGN fraction is sensitive to both of these factors, and there seems to be a sweet spot (ridge) in the diagram of black hole mass and bolometric luminosity. Furthermore, we present a hint that the Eddington ratio plays a role in determining the opening angles. This work is submitted to ApJS.

• Journal of Animal Science and Technology
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• v.46 no.1
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• pp.1-6
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• 2004

This study was conducted to investigate novel genetic variations of MCIR^*3 allele. In general, white spotting or white belt on a black backgroud in pigs is determined by the E$^p$ allele at the MCIR/Extention locus. E$^p$ shares a frameshift mutation with the E$^{D2}$ allele for dominant black color. An oligonucleotide primer set was designed to amplify complete coding sequence of the porcine MCIR gene. The MCIR coding sequences obtained from five breeds those were Landrace(white). Yorkshire(white), Hampshire(belt), Berkshire(spot) and Jeju native black pigs(black), were used for this study. A multiple sequence alignment of the MCIR coding region using Clustal W was performed. The total length of the MCIR coding sequence ranged from 963 to 966 base pairs(bp) among the selected breeds. The sequence analysis of the complete coding region of MCIR was revealed that Hampshire and Jeju native black pig have 3 cytosines deletion and Birkshire has 2 cytosines deletion at codon 23(nt68) in Extention loci. Besides the finding, there were three different missense mutations and a frameshift mutation in the MCIR coding region.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.23 no.11
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• pp.837-842
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• 2010

This paper describes the crystallinity, growth rate, and surface morphology of single crystalline 3C-SiC (cubic silicon carbide) thin films grown with several carbonization conditions such as temperature, $C_3H_8$ flow rate, time. In case of carbonization, an increase in the carbonization temperature caused a increase in the size and numbers of unsealed void (big black spot) which decrease the crystallinity. In addition, optimal $C_3H_8$ flow rate made carbonization layer form well and prevented the formation of voids. Also, after a period of time, the growth of carbonization layer did not increase no more. The single crystalline 3C-SiC thin films on optimal carbonized Si substrate showed an improvement on the crystallinity, the growth rate, the roughness, and the carrier concentration.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.04b
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• pp.26-30
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• 2000

In this paper, carbon and silver electrode properties of power electroluminescent device were investigated. Devices were manufactured by screen-printing and manufactured devices were measured following things with variable applied voltage; emission spectra, transferred charge density, brightness and current. A continuous test at $65 ^{\circ}C$ of temperature and 95% of humidity was operated. The brightness of devices which were made of silver and carbon electrode at 100V was $67.03cd/m^2$ and $60.02cd/m^2$ respectively. In case of device, which was made of silver electrode, a black spot was formed after 72 hours and degraded but carbon electrode was stable.

• Animal Systematics, Evolution and Diversity
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• v.32 no.4
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• pp.297-300
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• 2016

Here, we report three new arctiine moths for the first time in Korea, Siccia shikatai Kishida, Nudaria ranruna Matsumura, and Pelosia angusta (Staudinger). Siccia shikatai is distinguished by grayish forewings with a thick and blackish antemedial line, a thin, dark brown and dentate postmedial line and a black <-shaped discal spot and grayish hindwing with a dark brown discal dot. Nudaria ranruna is distinguished by the whitish fore- and hindwings and a large, blackish discal dot and thick medial lines on the forewing. Pelosia angusta is distinguished by dark grayish fore- and hindwings and a thick, dark brown, curved medial line on the forewing.

• Korean Journal of Ichthyology
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• v.17 no.3
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• pp.221-224
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• 2005

Three specimens (23.5~26.9 mm in SL) of Eviota (Gobiidae) were collected from about 13 m depth off Munseom, Jeju Island, Korea. They are identified as Eviota melasma by their having a conspicuous black spot on the occipital region of the head and no spots on the dorsal midline of the body. This represents a first record of the species from Korea and a northernmost occurrence of the species.

• Korean Journal of Ichthyology
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• v.18 no.2
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• pp.148-150
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• 2006

Two specimens of Apogon cookii of the family Apogonidae were collected from the coastal waters of Dokdo, Korea, and described as the first record from Korea. Specimens were caught by SCUBA diving using scoop net (length 33 cm, depth 63 cm) on October, 1997. The species differs from A. endekataenia in having 5 longitudinal stripes and a small black spot on the base of caudal fin. The new Korean name, "Da-seot-jul-eol-ge-bi-neul" as new Korean name of Apogon cookii.