• Journal of Korean Society of Steel Construction
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• v.20 no.1
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• pp.105-119
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• 2008

In steel deck bridges suffering directly on wheel load according to the number of serviced years, the occurrence of fatigue cracks increases in structural details, which includes the cross section parts of the longitudinal rib and transversal rib, and so on. Through the control method for these fatigue cracks the increased thickness of the steel deck plate or the application of retrofit detail to the inside of the longitudinal rib was observed to be effective. This study suggests structural details for the retrofitted and non-retrofitted longitudinal rib. The target details in this study are the connection parts of the lo ngitudinal and transversal rib, and the slit parts of transverse rib where fatigue cracks were frequently reported in previous studies. In the analyses, detailed structural analyses were performed as parameters, which include the shape, change of size and attached position. From the results the stress reduction in the target details was observed to be larger in the retroffited details. Also, the improvement of fatigue strength is more effective in the retrofitted details with the vertical rib than the bulkhead plate.

• Korean Journal of Microbiology
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• v.47 no.4
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• pp.375-380
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• 2011

We isolated an endophytic actionmycete from root tissues of rice plant collected from paddy field near Dankook University, Cheonan, Korea. Surface sterilized roots were laid on the selective agar plates and incubated. The powdery actinomycete colonies appeared on the root surface after four weeks incubation. We isolated a strain JK-5 among them and could determine its taxonomical position as Streptomyces diastaticus subsp. ardesiacus by using 16S ribosomal DNA sequencing. The chemotaxonomical and morphological studies confirmed the taxonomical position of the strain JK-5. The shape of aerial hyphae was flexible and they contained spore chains with more than 30 smooth spherical spores per chain. Cell walls contained LL-diaminopimelic acid. There was no characteristic sugar in whole-cell hydrolysates. The major fatty acids were anteiso-15:0, anteiso-17:0 and iso-16:0. The specific menaquinones, MK-9 ($H_6$), MK-9 ($H_8$), were detected. The GC content was 72%. Antifungal activities of the strain JK-5 were relatively strong against fungal plant pathogens. The endophytic growth of the strain JK-5 was confirmed by SEM observation of the root and stem of the infected rice plant.

• Tunnel and Underground Space
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• v.22 no.4
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• pp.227-242
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• 2012

Youngju multipurpose dam is planned to minimizing the damage by flood and obtaining the water for industrial use in Nakdong river region. Faults in rock mass have strong influences on the behaviors of dam structure. Thus, it is very important to analyse for the characteristics of fault rocks in dam design. However, due to the limitation of geotechnical investigation in design stages, engineers have to carry out the additional geological survey including directional boring to find the distribution of faults and the engineering properties of faults for stability of dam. Especially, the selection of location of dam and type of dam considering fault zone must be analyzed through various experimental and numerical analysis. In this study, various geological survey and field tests were carried out to analyse the characteristics of the large fault zone through the complex dam is designed in foundation region. Also, the distribution of structural geology, the shape of faults and the mechanical properties of fault rock were studied for the reasonable design of the location and type of dam for long-term stability of the complex dam.

• Parasites, Hosts and Diseases
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• v.25 no.1
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• pp.51-58
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• 1987

Tegumental ultrastructures of Echinochasmus japonicus were observed by scanning electron microscopy. The worms were recovered from albino rats which were experimentally infected with the metacercariae obtained from Pseudorasbora parva. Followings are summarized findings. 1. The worms were minute and plumpy gourdshaped with attenuated anterior and round posterior end. The tegument of whole body was wrinkled transversely and covered with cobblestone-like cytoplasmic processes. 2. Head crown was armed with 24 collar spines which were embedded in cytoplasmic pockets. The spines were arranged in a row with an interruption at dorsomedian line, however, the 2nd and the 4th spines were outstretched more than others. Oral and ventral suckers were muscular with numerous type II sensory papillae, and genital pore opened between the two suckers. 3. Tegumental spines were spade-shaped with broad base and pointed tip. They were compact in ventra-lateral tegument or dorsal surface of anterior body. They were not found between the two suckers and dorsal surface of posterior body. 4. Two types of sensory papillae, uni-ciliated (Type I) and roundly swollen sensory papillae (Type II), were observed. The type I papillae were chiefly distributed on ventral surface of tegument and type II were on the lips of suckers. Arrangement of collar spines, shape and distribution of tegumental spines or sensory papillae are regarded as characteristic features of E. japonicus.

• Parasites, Hosts and Diseases
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• v.32 no.3
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• pp.143-148
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• 1994

The metacercanae of the genus Stictodora encysted in gobies, Acnnthogobiln Snuimanw, purchased from a local market of Haenarn-gun, Chollanam-do, were identified as those of S. fuscotum A total of 1,437 metacercariae were collected from 30 gobies and sonle of them were orally fed to cats in order to obtain the adult worms. The metacercariae were 0.194-0.301 mm by 0.168-0.270 mm In size, yellowish brown, round to elliptical, and with a thin and transparent cyst wall. The excysted larvae were 0.280-0.423 mm long and 0.150-0.184 mm wide, beset with numerous tegumental spines on the anterior half of the body, and equipped 10 a characteristic ventrogenital sac. Total 21 adult worms were recovered from 2 cats 7 days after infection. The adult worms were small, leaf-like, 0.514-0.918 mm long and 0.235-0.377 mm wide. The ventrogenital sac was elliptical and its gonotyl was armed with 13-18 spines which were radially arranged and appeared as fan-shape. It has been confirmed that A. flavimanus is a second interinedlate host of 5. Juscatum In Korea.

• Horticultural Science & Technology
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• v.28 no.3
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• pp.515-518
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• 2010

'Gangha' is new strawberry ($Fragaria{\times}ananassa$ Duch.) cultivar, which was released by National Institute of Highland Agriculture, RDA, in 2008. In 2004, this cultivar was originated from a cross between 'Samahberi' and 'Elan' and showed excellent ever-bearing characteristics including continuous flowering habit, high yield under long-day and high temperature condition. It was named 'Saebong No.2' after examining its characteristic and productivity in summer culture from 2006 to 2007. Again, after two regional adaptability tests in 2008, 'Gangha' was selected as an elite cultivar. The general characteristics of 'Gangha' include semi-spreading type, middle vigor, elliptic leaf, and long cluster in growth. The fruit shape is oval and fruit color is red. Fruit quality had 1ow activity, hardness but high soluble solids contents. This average fruit weight of 'Gangha' is about 12.0 g and the marketable yield is relatively high because of more flower cluster appearance. It is resistant against powdery mildew, anthracnose, and fusarium wilt. 'Gangha' is suitable for summer culture using domestic consumption because it is shows continuous flowering habit, high yield, and fruit quality under long-day and high temperature condition.

• Horticultural Science & Technology
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• v.33 no.1
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• pp.149-154
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• 2015

A new Phalaenopsis cultivar 'SM 333' was bred by Sangmiwon Orchid, Korea, which produces young plants through tissue culture techniques. The new cultivar 'SM 333', showing the phenotype of multiflora with pink color and small, multibranching-type characteristics, was derived from crossing between Phalaenopsis 'Odoriko' and 'Be Tris'. An elite individual number '02-03-33' later termed 'SM 333' was selected among about 300 individual progenies, based on an intensive selection process covering vegetative and flowering distinctiveness over more than 2 years. In year 2004-2005, the 1st and 2nd characteristic analyses were carried out through performance and uniformity tests. 'SM 333' shows flower color that is bright clean pink (RHS # RP69D) and flower shape that is formal type with 5.0 and 5.8 cm in flower height and width, respectively. 'SM 333' is regarded as raceme flower type suitable for the small casual flower market. The leaves of 'SM 333' grow horizontally and about 20.8 cm in length and 6.5 cm in width. This cultivar also possesses no genetic variation, and is amenable to fast in vitro propagation and easy growth due to its vigorous growth habit. This 'SM333' was registered (Reg. # 2916) with Korea Seed & Variety Service (KSVS) on 1st December, 2009, and the plant breeder's right is currently controlled by Sangmiwon Orchid Company, Korea.

• FLOWER RESEARCH JOURNAL
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• v.17 no.4
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• pp.320-323
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• 2009

A new grafting cactus 'Yeomyeong' was developed by an interspecific crossing between Gymnocalycium marsoneri and G mihanovichii at the National Institute of Horticultural and Herbal Science, Rural Development Administration in 2005. In 2001, an interspecific crossing line '9922012' with orange color was selected from the cross of G. marsoneri ${\times}$ G. mihanovichii 'IG-112'. The line '9922012' as a female parent was crossed with G. mihanovichii 'IG-177', and the orange colored lines were obtained in 2002. The 'Wonkyo G1-159' was selected from the orange colored lines through three times of characteristic evaluation during 2003 to 2005. The 'Wonkyo G1-1 59' was named 'Yeomyeong' in the RDA in 2005. The color of both body and tubercle was orange. The shape of globe was flattened round and it had 7 to 9 ribs. The spine was erect, short sized and grayish brown color. Growth was faster, reaching 41.8-47.7 mm in diameter, than the comparison cultivar 'Hwangwol', at 10 months after planting. The number of tubercle was 6.9-12 per globe. 'Yeomyeong' was developed for export to the America and the Netherlands. Characteristics of the cultivar could be maintained by grafting on the Hylocereus trigomus.

• FLOWER RESEARCH JOURNAL
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• v.19 no.2
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• pp.115-118
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• 2011

A light pink single freesia (Freesia hybrida Hort.) 'Bolero' was developed from a cross of breeding line ('Yellow Ballet' and 'Yellow Dream') and 'Sandra' followed by seedling and line selections at the National Institute of Horticultural and Herbal Science (NIHHS), Rural Development Administration (RDA) in 2007. Growth and flowering characteristic tests were conducted from 2003 to 2006. 'Bolero' has single type flower with light pink color (RHS, R55B). It has multiple florets, stable flower shape, upright leaves and stalks. The average cut flower yield of 'Bolero' observed in the greenhouse from 2005 to 2007 was 7.5 cuttings per plant. It has good production of cormlets and vigorous growth. 'Bolero' could be cultured under greenhouse conditions in Korea.

• Korean Journal of Remote Sensing
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• v.23 no.2
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• pp.131-135
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• 2007

The tidal channel is influenced by sediment type, grain size, grain composition and tidal currents in tidal flat. The development of tidal channel including density, shape and order can be used to analyze the characteristics of tidal channel. The quantitative investigation to the tidal channel is insufficiency. In this paper, we represented the fractal analysis method according to the quantitatively analysis in tidal channel and compared with the different intertidal channel patterns. The tidal channel was extracted from the IKONOS image of the southern part of the Kanghwa-do. We used the Box-counting method to estimate fractal dimensions for each tidal channel. As a result, the fractal dimension values (D) were 1.31 in the southern Kanghwa-Do. Linear pattern and less dense channel development area had low D values (from 1.0563 to 1.0672). Dendritic pattern and dense channel development area had high D values (from 1.2550 to 1.3016). In other words, fractal dimension values had difference about 0.2 values according to the characteristic of tidal channel development. We concluded that fractal analysis can be able to quantitatively classification in tidal channel.