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BLUE STRAGGLERS, CATACLYSMIC VARIABLES, X-RAY BINARIES, AND MILLISECOND PULSARS IN GLOBULAR CLUSTERS

  • Lee, Hyung-Mok
    • Journal of The Korean Astronomical Society
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    • v.25 no.1
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    • pp.47-64
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    • 1992
  • Cores of globular clusters are an ideal place for close encounters between stars. The outcome of tidal capture can be stellar mergers, close binaries between normal stars (W UMa type), cataclysmic variables composed of white dwarf and normal star pairs, or low-mass X-ray binaries consisting of a neutron star and a normal star pairs. Stellar mergers can be the origin of blue stragglers in dense globular clusters although they are hard to observe. Low mass X-ray binaries would eventually become binary pulsars with short pulse periods after the neutron stars accrete sufficient amount of matter from the companion. However, large number of recently discovered, isolated millisecond pulsars (as opposed to binary pulsars) in globular clusters may imply that they do not have to gain angular speeds during the X-ray binary phase. We propose that these isolated millisecond pulsars may have formed through the disruptive encounters, which lead to the formation of accretion disk without Roche lobe filling companion, between a neutron star and a main-sequence star. Based on recently developed multicomponent models for the dynamical evolution of globular clusters, we compute the expected numbers of various systems formed by tidal capture as a function of time.

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An Efficient Image Description Method and Content-based Image Retrieval using Circular Scanning Pattern (회전 주사 패턴을 사용한 효율적인 영상 기술 및 내용 기반 영상 검색)

  • 송호근;강응관
    • Journal of Korea Multimedia Society
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    • v.4 no.1
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    • pp.29-36
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    • 2001
  • This paper proposes an efficient image description method for image retrieval using circular scanning pattern. Therefore, we place the origin of the circular scanning pattern on center point of an image and describe spatial color features of the image using the pattern. The features are Circular Dominant Color, Circular Color Texture, and Circular Color Variation Plot. By the method we can describe color and spatial information of the image at a time, efficiently. Therefore, we can reduce the computational expense and memory usage needed to index the image more than the conventional one does.

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Origin of the Vascular Combium in the Developing Hypocotyl of Glycine max Seedling (대두 유식물의 배축에 있어서 유관속형성층의 기원)

  • 강경덕
    • Journal of Plant Biology
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    • v.31 no.4
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    • pp.289-298
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    • 1988
  • The pattern of elongation in the developing hypocotyl of Glycine max shows that the elongation generally proceeds from base to the cotyledonary node in acropetal diredtion, although earlier elongation takes place through the entire hypocotyl. Because the differentiation of the vascular cambium in the hypocotyl advances also acropetally, it can be seen that the acropetal wave of hypocotyl elongation is associated with the acropetal differentiation of the cambium in the hypocotyl elongation is associated with the acropetal differentiation of the cambium in the hypocotyl elongation is associated with the acropetal differentiation of the cambium in the hypocotyl. The elongation of procambial cells occurs not only during active elongation but also after cessation of elongation of the hypocotyl. In tangential view, the procambium of the hypocotyl in early stage has homogeneous structure composed of short cells. Subsequently, these procambial cells elongate actively and then become elongated long cells. These long cells eventually become fusiform initials, while some of elongated long cells are transversely divided and then converted into ray initials. The characteristics of the vascular cambium are entirely acquired some time after hypocotyl elongation is completed, and the transitin from procambium to vascular cambium in the hypocotyl is a rather gradual process.

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An Etymological Research of Gyeok(鬲, 膈) in The "Hwangjenaegyeong(黃帝內經)" ($\ll$황제내경(黄帝内经)$\gg$ "격(鬲)", "격(膈)" 고원(考源))

  • Gu, Hai-Yan;Kim, Hyo-Chul
    • Journal of Korean Medical classics
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    • v.22 no.4
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    • pp.213-215
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    • 2009
  • The thoracic diaphragm is a muscle tissue separating the thorax and abdomen of a man. In "Somun(素問)", Gyeok(鬲) means diaphragm. Its meaning comes from Gyeok(鬲), a tripod boiler with three separated parts for cooking. In "Yeongchu", Gyeok(膈) is a pictophonetic character which takes the place of Gyeok(鬲). The different uses of the two words probably does not come from the original writing, but result from longtime transformation.

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Properties of transient horizontal magnetic fields and their implication to the origin of quiet-Sun magnetism

  • Ishikawa, Ryohko
    • The Bulletin of The Korean Astronomical Society
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    • v.37 no.1
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    • pp.84.1-84.1
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    • 2012
  • Recent spectropolarimetric observations with high spatial resolution and high polarization sensitivity have provided us with new insight to better understand the quiet-Sun magnetism. This talk is concerned with the ubiquitous transient horizontal magnetic fields in the quiet-Sun, as revealed by the Solar Optical Telescope (SOT) on board Hinode satellite. Exploiting the SOT data with careful treatment of photon noise, we reveal the enigmatic properties of these horizontal magnetic fields such as lifetime, size, position in terms of granular structure, occurrence rate, three-dimensional structure, total magnetic flux, field strength distribution, relationship with the meso- and super-granulations and so on. Based on these observational consequences, we conjecture that the local dynamo process, which takes place in a relatively shallow layer with the granular size, produces these transient horizontal magnetic fields and that these horizontal magnetic fields contribute to the considerable amount of quiet-Sun magnetic fields. We also estimate the magnetic energy flux carried by these horizontal magnetic fields based on the statistical data, and find that the total magnetic energy is comparable to the total chromospheric and coronal energy loss, implying their important role for the chromospheric heating and dynamism.

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A Survey on Perceived Food Safety in Urban Residents (일부 수도권 거주 주민의 식품 안전성에 대한 인식 조사)

  • Nam Hee-Jung;Kim Young-Soon
    • The Korean Journal of Food And Nutrition
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    • v.19 no.2
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    • pp.126-142
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    • 2006
  • A survey was conducted to investigate the relationship between knowledge of perceived food safety and actual food purchase practices among parents of children under the age of seven (N=309) in 2005. The seventeen following perceived food safety items were included in the survey (bovine spongiform encephalopathy, foot and mouth disease, pathogenic avian influenza, swine fever, allergens, GMO, irradiated food, food poisoning bacteria, endocrine disrupter, antibiotics, food additives, carcinogen, natural toxin, agrichemical residues, place of origin, cultivation methods, and heavy metal) Most parents were highly concerned about investigating all food safety topics. Up to 90.0% of the participants recognized the importance of food safety. The public concern has caused a considerable decline in the demand for food afterreceiving news about food safety through mass media, Also, the majority of subjects required correct food safety information.

3-Dimensional Measurement of the Prismatic Polyhedral Object using Machine Vision. (Machine Vision을 이용한 기둥형 물체의 3차원 측정)

  • 조철규;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.733-737
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    • 1996
  • This paper presents a method to measure tile position and orientation of a prismatic polyhedral object (of unknown width, length, height, and number of vertices) using machine vision. The width, length, and origin of workplace where an object is lying are defined as Preliminary operation. The edges of an object are detected from captured image using least sum of square error. The information of an object is determined from the geometric relationships between edges. As an user interface, a versatile image processing program is developed in several modules, and renders a very useful 3D measurement at a limited constraints when adopted in automation of production process. The flexibility of camera position from the algorithm developrf can be used for automated pick and place operations and feeding workpiece u: ;ing assembly robot.

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A Study on the Fashion Communicating of The East and The West (동서양(東西洋)의 패션 커뮤니케이션에 관(關)한 연구(硏究))

  • Chun, Hei-Jung
    • Journal of Fashion Business
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    • v.1 no.3
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    • pp.82-94
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    • 1997
  • The purpose of this study is to focus on the fashion communicating of the East and the west. For this purpose, the study will analyze the Visions of the East in Western Dress has long expressed an intense multiculturalism. This study is realized that clothing has served to consolidate more then to segregate. While never losing the characteristics of its place of origin, clothing has shown itself a reading assimilated object portability and ephemerality promote investigation, at the very least. Eastern ideas of textile, design, construction, and utility has been realized again as a positive contribution to the culture of the West. The East offers a larger concept in alternative to the Western propensity for tailoring. In giving primacy to the textile, Eastern dress emphasizes the flat terrain of cloth, the looping and Wrapping of the garment, and the integrity of the untailored textile. There values, antithetical to postmedieval Western dress, have offered a paradigm of dressing and dressmaking to the West that has been sporadically Influential, and notably so in our time.

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A Study on Terminology of Effectiveness and Symptoms of disease in Meteria Medica (본초(本草) 효능(效能) 주치(主治) 용어(用語)에 대(對)한 연구(硏究))

  • Shin, Jae-Hyuk;Lee, Byeong-Wook;Eom, Dong-Myung
    • Journal of Korean Medical classics
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    • v.23 no.2
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    • pp.107-118
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    • 2010
  • Terminology in any study is an important part. In traditional medicine, especially in meteria medica, ther are many sections of explanation, which are origin, place of production, component, taste, effectiveness meridian entry, symptoms of disease, etc. "Bonchohak(本草學)" is one of the textbook of meteria medica in Korea. In that book, descriptions of meteria medica by effectiveness, symptoms of disease are supposed to be with accordance in the same section. However, unfortunately it is not. In this paper, I will explain those discordances and differences.

An Analysis of the Use of Web-based Information on Landscape Plants (웹 사이트를 통한 조경수목 유통정보활용 실태분석)

  • Cho Se-Hwan;Ryu Jae-Ho
    • Journal of the Korean Institute of Landscape Architecture
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    • v.32 no.4
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    • pp.21-27
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    • 2004
  • This study aims to analyze the frequency of the use of internet web sites for information on landscape trees, and to suggest an improved direction for internet information content concerning of landscape trees. 10 areas of 5internet web-sites that are presented by an internet search with Yahoo Korea, Empas and Naver were studied for their importance and satisfaction degrees by landscape architects who use them. The users recognized the importance of the contents of the internet web-sites for landscape trees, but were not satisfied with it. It was proposed that the web-sites should provide higher quality information on the growth history, price, shipping and handling, payment and the place of origin. Especially, the paper proposes that web-sites should more aggressively utilize information on the quality of landscape trees such as tree forms, trimming states of roots, etc.