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WHITE NOISE APPROACH TO FEYNMAN INTEGRALS

  • Hida, Takeyuki
    • Journal of the Korean Mathematical Society
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    • v.38 no.2
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    • pp.275-281
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    • 2001
  • The trajectory of a classical dynamics is determined by the least action principle. As soon as we come to quantum dynamics, we have to consider all possible trajectories which are proposed to be a sum of the classical trajectory and Brownian fluctuation. Thus, the action involves the square of the derivative B(t) (white noise) of a Brownian motion B(t). The square is a typical example of a generalized white noise functional. The Feynman propagator should therefore be an average of a certain generalized white noise functional. This idea can be applied to a large class of dynamics with various kinds of Lagrangians.

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A Standard Gerbera Cultivar 'White UFO' with White-Coloured and Semi-Double Flower (대륜계통의 반겹꽃 절화용 거베라 신품종 '화이트 유에프오')

  • Moon, Sang Ho;Kang, So Young;Kim, Tae Keun;Song, Chang Khil
    • FLOWER RESEARCH JOURNAL
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    • v.25 no.2
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    • pp.91-94
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    • 2017
  • A 'White UFO' is a large-sized flower with a semi double black disk. It was bred between 'Himalaya' as a mother plan t, an d 'Won der Kin g' as a father plan t, the 89 seeds were obtained from 2004. The selected plant from seed had been proliferated in the apical meristem culture and they were planted in the field to observe growth and flowering for 3 years. Flower quality and yield ability were recognized sufficiently competitive. As a result, in 2007, named as 'White UFO', applied for registration with the Korea Seed & Variety Service, and registered in 2009. The in tern al an d extern al ray flower was in white color (RHS 155B) and 13 cm diameter as a large variety. The central part of the inflorescence was black and a peduncle flower stalk was green. Flower height was 60 cm, 5 cm longer than that of 'White Candy', a similar variety, delivering a stronger marketability. The longevity of cut flower was 12.5 days, similar to that of a similar variety.

A New Cultivar Cymbidium 'White Princess' with White Color and Vigorous Growth (생육이 강한 대형 백색계 심비디움 'White Princess' 육성)

  • Kim, Mi-Seon;Cho, Hae-Ryong;Lee, Hye-Kyung;Lim, Jin-Hee;Choi, Sung-Yul;Kim, Young-Jin
    • FLOWER RESEARCH JOURNAL
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    • v.16 no.4
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    • pp.295-298
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    • 2008
  • A new Cymbidium cultivar 'White Princess' was released by the National Horticultural Research Institute (NHRI) in 2005. A cross was made in 1995 between 'Cymbidium 2113', light purple colored petal and medium plant sized variety, and 'Lucky Rainbow Randevous', a dark purple petal with red lip and large type variety. The ninety progenies were obtained after planting and acclimatization in green house. In 2000, a line (9526747) was selected and multipliticed after test of its flower color, leaf shape, flower stalk, and vigorous growing habit. After evaluation trial for two growing seasons, the selected line was named as 'White Princess'. The 'White Princess' has white petals (WN 155A) with red lip (RP59D) color and large sized leaves, and flowers (leaf length is about 88 cm and flower diameter is about 8 cm) with semi-erect flower stalks. Blooming started from December to January in optimal culture conditions. High temperature (more than $30^{\circ}C$) and low light intensity(less than 10,000Lux) should be avoided for the appropriate growth.

Seedling Growth and Morphology as Influenced by Removal of Cotyledon and Unifoliolate in White Clover (자엽 및 단엽 제거에 따른 White Clover의 유묘기 생장과 형태적 특성)

  • 강진호;박진서;이희원
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.39 no.5
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    • pp.480-488
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    • 1994
  • Low seedling growth rates of white clover (Trifolium repens L.) have been limited its good establishment to pastures. The experiment was done to determine the effect of removal of cotyledon and unifoliolate on the growth and morphological characters of contrasting white clover cultivars for 8 weeks after the treatment. Individual plants of cv. Regal (large leaf), Louisiana S-l (medium-large leaf), Grasslands Huia (medium-small leaf) and Aberystwyth S184 (small leaf) were grown in 10cm plastic pot containing a 2:1:1 soil:sand:peat moss mixture until the cotyledon or unifoliolate stage and then removed one (C1) or two cotyledons (C2) at cotyledon stage, and unifoliolate only (U), unifoliolate and one cotyledon (DC1) or unifoliolate and two cotyledons (DC2) at the unifoliolate stage. To measure the removal effect on biomass and morphological characters (leaf area, petiole and stolon lengths, growing tips and leaves), plants were sampled 4, 6 and 8 weeks after the treatment. Intact plants had greater biomass and morphological characters than removal-treated ones, Removal treatments at cotyledon stage, C1 and C2, were decreased more biomass and morphological characters than removal ones at unifoliolate stage while the severer cotyledon removal, the more reduction. Stolon length per plant and petiole length markedly inclined 6 weeks after the treatments although biomass and the other characters continuously did. Relatively large-leaved cultivar had more biomass, leaf area per plant and longer petiole than the other(s) but the reverse results were true in stolon length, growing tips and no. of leaves per plant. Biomass was linearly increased with increased leaf area but the earlier and severer removal, the less slope. The severer damage of cotyledon and unifoliolate had detrimental effects on the growth and aftermath establishment of white clover

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Ultrastructure of epididymal spermatozoa in three Korean shrews (한국산 땃쥐류 3종에 대한 부정소 미부 정자의 미세구조)

  • 윤명희;정순정
    • Journal of Life Science
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    • v.11 no.1
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    • pp.54-61
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    • 2001
  • The comparative morphology of epididymal spermatozoa in the lesser white-toothed shrew, Crocidura suaveolens, the Japanese white-toothed shrew, C. dsinezumi and the big white-toothed shrew, C. lasiura, belonging to the subfamily Crocidurinae was studied with the light and electron microscopes. The spermatozoa of C. lasiura and C. dsinezumi were characterized by the large acrosome, serrated inner acrosomal membrane, common apical body and fistulous proximal centriole with slightly dense electron granular materials, which are the charateristics of the Crocidurinae. The C. suaveolens, however, is distinguished from the two species mentioned above in the sperm morphology. That is, the spermatozoa possess not only the charateristic of the Crocidurinae such aw the large acrosome, but also those of the Soricinae, i.e. the smooth inner acrosomal membrane, wavy, finger-like and electron-dense apical body, and the solid proximal centriole filled with electron-dense materials. The results suggest that C. suaveolens has conserved characteristics of the Soricinae.

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Estimation of Survivorship and Population Dynamics of White-fronted Geese (Anser albifrons) in Junam Reservoir, Korea (주남저수지에 도래하는 쇠기러기의 PVA에 의한 생존확률 추정 연구)

  • Park, Ji-Eun;Lee, Sang-Don
    • Journal of Environmental Impact Assessment
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    • v.18 no.5
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    • pp.293-299
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    • 2009
  • Wintering migratory species of white-fronted geese (Anser albifrons) are common visitor in South Korea, and this study examined the survivorship of white-fronted geese in the Junam Reservoir with the application of Population Viability Analysis (PVA) technique. In Junam PVA analysis was done for the next 50 years using factors of breeding population, sex ratios, survivorship in the VORTEX program. As a result white-fronted geese will reach to carrying capacity within 40 years, and population will reach to carrying capacity later when it becomes smaller. Also with a large initial population white-fronted geese will reach to carrying capacity earlier. In conclusion, for the next 50 years the white-fronted geese are expected to a long-term survival with stable condition with survivorship (0.03) and extinction rate (0.0).

A study on the development of thin-walled metal bearing for the large-sized slow speed diesel engines. (대형저속 디젤엔진용 박판형 메탈 베어링의 국산화 개발에 관한 연구)

  • 김영주;조문제
    • Journal of Advanced Marine Engineering and Technology
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    • v.19 no.4
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    • pp.61-71
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    • 1995
  • Nowadays the thin-walled metal bearing, which is made seperately from the bearing housing and has the ratio of wall thickness/bearing diameter being less than 1/30, are used in many newly developed large-sized slow speed diesel engines for the purpose of upgarding lubication performance and easy maintenance according to the trends of increasing output per cylinder and lowering engine speed. The type of this bearing has been used generally in many small-sized high speed engines applied for automobile, high speed craft and industrial power generation systems since 1950s. But the tranditional thick-walled bearings, whice are linned white metal on the bearing housing directly, have been installed on the large and slow speed engines until 1990s due to the easy manufacturing procedures. In this study we have calculated optimum dimensions of the metal bearing, fabricated special zigs for crush measurement, model test machine, 2 sets of specimens.(crosshead pin bearing, $\phi$818*552*20mm) for B & W 6S70MC(20, 940*88rpm), and evaluated metal constact phenomena of white metal, its friction coefficient, temparature rise through the model test and field performance test.

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New Records of Five Ennomine Moths (Lepidoptera: Geometridae; Ennominae) from Korea

  • Choi, Sei-Woong;Kim, Sung-Soo
    • Animal Systematics, Evolution and Diversity
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    • v.31 no.2
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    • pp.122-127
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    • 2015
  • The subfamily Ennominae is one of the most species-rich taxa of Geometridae that include more than 9,700 species worldwide and over 280 species in South Korea. Herein, we present the first report of five species of Ennominae. Abraxas flavisinuata can be characterized by the white wings, a thick black postmedial line that is medially and dorsally broken with an orange band, large rounded black discal dots on the forewing, and a black dotted postmedial line on the hindwing. Lomographa claripennis can be characterized by the whitish wings, the black undulating postmedial line as well as the minute blackish discal dot on the forewing, and the black undulating postmedial line with a minute black discal dot on the hindwing. Arichanna tetrica can be characterized by the grayish forewings, thick black transverse ante- and postmedial lines, a large blackish discal dot, whitish apical streak on the forewing, and scattered black dots on the whitish hindwing. Apocleora rimosa can be characterized by the brown ground color of the fore- and hindwings, the black slanted ante- and postmedial lines of the forewing, and two black medial lines on the hindwing. Ourapteryx japonica can be characterized by the white wings, the dark brown transverse ante- and postmedial lines with a long discal dot on the forewing, and the dark brownish transverse antemedial line as well as a termen that has a sharp white tail with one large dark reddish dot and one small black dot on the hindwing.

Fermentative Production of White Pepper Using Indigenous Bacterial Isolates

  • Thankamani Vaidyanatha Lyer;Giridhar Raghavan Nair
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.9 no.6
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    • pp.435-439
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    • 2004
  • Three Bacillus strains were isolated from soil samples. Morphological and physiologi­cal characterization indicated that the isolated strains were B. mycoides, B. licheniformis and B. brevis. White pepper was produced from black pepper by the fermentative method using the isolates in shake flaks as well as in a large-scale fermenter. Volatile oil and piperine contents of the product were $3.2\%$ (v/w) and $4\%$ (v/w) respectively. The moisture content was $15\%$. The mi­crobial contamination was less than 10 per 100 g. The product also exhibited excellent storage stability.