• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.5
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• pp.815-821
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• 1994

Short-term fading in a mobile radio channel is mainly caused by multipath reflected wave by local scatterers or natural obstacles surrounding a mobile unit. In this paper, we analyze probability density function(PDF), level crossing rate(LCR) and widths and depths of fades for the measured field strength data in Seoul and Daejeon areas. As a result, the satatistical distribution of signal variations within any small area with the constant mean value becomes the Rayleigh distribution The variation of fade depths is small regardless of the environment such as urban, suburban. etc. However, the variation of fade widths is large with the change of circumstantial structures and environment. the maximum level crossing rate is obtained near the mean value.

• Horticultural Science & Technology
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• v.28 no.5
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• pp.895-898
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• 2010

A new light pink spray-mum, 'Noble ND' was bred by crossing 'Mona Lisa', a white anemone type flower, and 'Dark Weldon', a pink anemone type flower in October, 2004. The growth and flowering characteristics were investigated in forcing, natural, and retarding cultures from 2006 to 2007. The 'Noble ND' was a medium-flowering fall-mum with light pink anemone type flower and had 9.2 flowers per stem, with 4.8 cm flower diameter in natural culture. The number of days to flowering and flowers per plant was 57 and 7.4, respectively, in forcing culture of 'Noble ND', whereas the number of days to flowering was 48 in retarding culture.

• FLOWER RESEARCH JOURNAL
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• v.18 no.1
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• pp.73-76
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• 2010

A new light pink spray-mum, 'Brown ND' was bred by crossing between 'Noeul', a yellow anemone type flower, and 'Dalma', a pink anemone type flower in October 2003. The growth and flowering characteristics were investigated in forcing, natural, and retarding cultures from 2005 to 2007. The 'Brown ND' was a medium-flowering fall-mum with light pink anemone type flower and had 10.6 flowers per stem, 4.1 cm diameter of flower in natural culture. The number of days to flowering and flowers per plant was 59 and 9.1, respectively, in forcing culture of 'Brown ND' whereas the number of days to flowering was 49 in retarding culture.

• FLOWER RESEARCH JOURNAL
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• v.18 no.1
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• pp.77-81
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• 2010

A new white spray-mum, 'White Ball' was bred by crossing between 'Stallion', a white anemone type flower, and 'Hyangno', an anemone type with pink petals in October 2003. The growth and flowering characteristics were investigated in forcing, natural, and retarding cultures from 2005 to 2007. The 'White Ball' was a medium-flowering fall-mum with white anemone type flower and had 16.2 flowers per stem, 3.6 cm diameter of flower in natural culture. The number of days to flowering and flowers per plant was 58.5 and 11.9, respectively, in forcing culture of 'White Ball' whereas the number of days to flowering was 54 in retarding culture.

• Annual Conference on Human and Language Technology
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• 1997.10a
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• pp.360-363
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• 1997

코퍼스 속의 언어적 규칙을 직접적으로 사용하여 한국어 의존 구조를 분석하기 위해, 본 한국어 의존 구조 분석기는 의존 구조가 나타나 있는 코퍼스로부터 변환 규칙 학습기로 규칙을 자동적으로 학습하고 그 규칙을 적용함으로써 한국어 의존 구조를 분석한다. 이를 위해 기존의 연구된 구구조 문법의 규칙 틀과는 다른 한국어 의존 구조에 맞는 규칙 틀을 연구하였고 또 의존 구조에서 발생할 수 있는 교차구조(Crossing structure)를 방지하는 연산을 고안하였다.

• Animal cells and systems
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• v.2 no.4
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• pp.435-438
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• 1998

In the present study, we have examined the crossability of four species in the A. jaluense complex to provide additional information on their delimitation and levels of differentiation. Crosses between diploid A. chiisanense and the tetraploid species including A. jaluense s. str., A. triphyllum, and A. pseudoproliferum yielded no fruit- or seed-set, indicating that the former species is reproductively completely isolated from the latter three species. In interspecific crosses between the tetraploid species, combinations involving A. jaluense s. str. resulted in much reduced fruit- and seed-set, indicating that A. jaluense s. str. is more or less reproductively isolated from the other tetraploid species. However, crossing data revealed the absence of reproductive isolation between A. triphyllum and A. pseudoproliferum These results strongly support the relationships that have been previously suggested for the A. jaluense complex on the basis of morphology, chromosome number, and flavonoid chemistry.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.05a
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• pp.298-302
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• 2002

Equivalent volume estimation of the coupler and two coupled microphones has a key role in standard microphone pressure calibration. The equivalent volume of the microphone is determined by the dynamic characteristics of the diaphragm system and front cavity. Therefore the modal parameters of diaphragm system - natural frequency and damping fatter - should be measured explicitly for the estimation of the equivalent volume. The diaphragm system is composed of the vibrating diaphragm, back slit behind diaphragm, pressure equalization vent, and front cavity which are acoustically coupled. In the measurement, the electrostatic actuator was used to excite the system with the swept sine, and the frequency response was obtained. The close actuator in front of the diaphragm must influence the radiation impedance of the system, and then the modal parameters. From the measured frequency response, the natural frequency and the damping factor could be estimated with the Complex exponential method based on the Prony model and the zero crossing real and imaginary plot.

• Korean Journal of Plant Resources
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• v.17 no.1
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• pp.54-57
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• 2004

These studies were carried out to develop native Calanthe in Korea. Calanthe native to southern islands in Korea has beautiful flowers with various color and sweet fragrance, and it has been reported to have very good ornamental value. According to the morphological characteristics of leaves and flower color, 57 horticultural lines of Calanthe collected in natural crossing group were investigated. And the selected orchid was given a name of horticultural cultivar to ‘Narai’. In its color of flower, sepal was deep purplish red, petal was yellow and lip was white. And also, ‘Narai’ had strong fragrance and shape of blooming was flat-blooming type.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.48 no.4
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• pp.339-344
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• 2003

To identify the new source of breeding materials for rice salt tolerance, the salinity tolerance of thirty-four varieties was evaluated under 0.5% saline condition at seedling stage. The salinity score showed highly significant correlations to dry weight and dead leaf ratio. The tested varieties were classified into three groups by visual score, reduction ratio of dry weight, and dead leaf ratio. Eighteen varieties were classified as the highly tolerant group (salinity scores of 1.3-3.7), seven varieties were fallen into the tolerant group (salinity scores of 4.2-5.8), and others were susceptible (salinity scores of 6.7-9.0). In highly tolerant group, most indica varieties including Getu, Dikwee and Kuatic Putic, didn't exsert a panicle under the Korean climate. But six varieties, Xiangcho V, Annapuruna, HP 3319-2wx-6-3-1, Giza 175, and GZ 2447-S-17, GZ 4255-6-3 were suitable to the Korean climate, and their heading date (6-16, August) and culm length (65-78㎝) were similar to the Korean varieties. Accordingly, these varieties can be utilized as crossing materials for the salt tolerance in japonica rice.

• Journal of the Korean Association of Geographic Information Studies
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• v.19 no.3
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• pp.89-101
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• 2016

This study examined spatial disposition of wildlife highway mortality using road-kill GIS database and Naver panoramic 360 degree views to find out which habitat and road variables most influenced road-kill numbers for each mammal species and how the landscape and road elements are connected on highway. Road-kills on Yeongdong(YD) and Jungbu highway(JB) generally tended to be higher in natural barren, grassland and cropland due to its value of preferred habitats of nocturnal and multihabitat species like water deer(Hydropotes inermis argyropus), raccoon(Nyctereutes procyonoides) and hare(Lepus coreanus). Land cover in YD showed no difference between species (p=0.165) while JB did by species (p=0.001). This may be explained by disparate landscape between mountain and urban or the fact that YD in long term operation might have enabled consistent crossing pattern compared to JB experiencing continuous extension works which may in turn have deviated the road crossing. Although road-kill prevention effect of local topography alone was appreciable, compared to less significant or ineffective fence and guardrail, gentle slope declining in a direction to the road turned out to offset the preventive effect of juxtaposed fence. Furthermore, green patches on road near intersection were deemed a visual stepping stone facilitating wildlife attempted crossing and local roads juxtaposed with a highway were especially left defenceless to road-kill without road barriers.