• Title/Summary/Keyword: 발달현상

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Progress and prospect of social and population geography in Korea (한국의 사회 . 인구지리학의 발달과정과 전망)

  • ;Choi, Byung-Doo
    • Journal of the Korean Geographical Society
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    • v.31 no.2
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    • pp.268-294
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    • 1996
  • Social and population geography in Korea has been developed somewhat later than other special subjects of geography. But in recent years, it has attracted much interests of geographers, and accumulated a considerably large amount of research products. Seen in this context, it is resonable to expect that social and population geography will not only lead the development of geography in the future, but also contribute to the resolution of socio-spatial problems in Korea. From this point of view, we shall retrospect in this paper the progress of social and population geography in Korea since the 1950s, and look out its future prospect and further research tasks. In the first place, we discuss general concepts and major themes of social and population geography, and overview its development process, and than review in more details some important research products which would be categorized into five main subjects, that is, research methodology, urbanization and urban population phenomena, population movement and changing rural life, residential differentiation and urban redevelopment, and urban social life and regional social well-being. Finally, we consider briefly the future prospect and further tasks of social and population geography in Korea.

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A Model Research on How the Development of Transport Changes Central Place System (교통발달에 의한 중심지체계 변화 모형의 분석과 함의)

  • Kwon, Ohyeok
    • Journal of the Korean Geographical Society
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    • v.51 no.1
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    • pp.77-88
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    • 2016
  • Dramatic changes have so far been made in the system of central places over the past century. The development of transport has particularly exercised principal influences on the changes of the system of central places. This paper is to examine how and why the development of transport enables such changes to take place in the system of central places, through conducting model research. This paper suggests some models that development of transport be taken as an independent variable and that the division of market area between the central places be as the development of variable. The suggested models show that the development of transport extends the market area of higher central places but reduces the market area of lower central places.

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Studies on the Gonadal Development and Gametogenesis of the Granulated Ark, Tegillarca granosa (Linnee) (꼬막, Tegillarca granosa ( Linne ) 의 생식소발달 및 생식세포형성에 관한 연구)

  • 이주하
    • The Korean Journal of Malacology
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    • v.13 no.1
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    • pp.55-64
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    • 1997
  • 꼬막, Tegillarca granosa은 우리나라 남해 및 서해안 일대에서 서식하는 중요한 수산자원 중의 하나이지만, 이에 대한 생물학적 기초연구는 거의 없는 실정이다. 따라서 1995년 2월부터 1996년 1월까지 전남 벌교연안에서 채집한 꼬막의 생식소발달, 생식세포형성과정 및 생식주기를 조사하였다. 1. 꼬막은 자웅이체이면서 난생이고, 생식소는 내장낭의 간중장선을 싸고 있는 결합조직으로부터 족부의 근육층까지 분포한다.2. 미분화간층직과 호산성 과립세포들이 초기 활성기의 소낭에 풍부하게 나타나기 시작하여 완숙기에는 거의 없어지는 것으로 보아, 이들은 생식소 및 생식세포형성과 발달에 영향을 공급하는 영향세포로 생각된다.3. 생식소발달, 생식세포형성과정, 조직분화과정 및 세포학적 특성에 따라, 이들의 생식주기를 초기 활성기, 완숙기, 부분 방출기, 방출 및 비활성기 등으로 구분할 수 있다. 4. 방란 및 방정은 수온 2$0^{\circ}C$정도되는 6월하순부터 시작되고, 주산란시기는 수온이 23-24$^{\circ}C$정도 되는 7-8월이며, 완숙란의 크기는 50-60$\mu\textrm{m}$이다.5. 비활성기는 9월에서 이듬해 4월까지 지속되는 비교적 긴 기간이며, 초기 활성기도 비교적 길어 1월에서 5월까지 지속되는 반면, 후기활성, 완숙 및 방출기는 비교적 짧아, 5월에서 8월까지 모두 완료된다.6. 비만도의 월별 변화는 생식소의 발달, 생식주기 및 수온과 밀접한 관계가 있다.7. 사용된 재료 433개체 중 1개체가 자웅동체현상을 나타내었다.

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Mechanism of Longitudinal Dispersion in Open Channel Flow with Secondary Flow Effects

  • 이길영
    • Water for future
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    • v.13 no.4
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    • pp.51-59
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    • 1980
  • 본 논문에 있어서 오염물질의 분산현상에 관한 해석은 활류의 전단효과에만 의존해온 과거의 연구와는 달리, fingering 현상과 2차류의 특성과의 관계로 고찰하는 것이 본 연구의 목적이다. finering 현상의 발달과정과 일반적인 제인자들을 결정하기 위해서, 횡방향속도분포와 속도변동은 taft법과 수색기포법에 의해서 측정하였고, 특히 농도의 유하상태는 laser-beam System을 사용해서 명확하게 측정하였다. 이 현상은 유동모델에 의한 2차류를 고려하므로써 명백하게 설명 할 수 있었다. 그 결과, 분산계수는 활류구조와 함께 단면내 2차류에 의해서도 강한 영향을 받는 것이 구명되었다. 또, 분산계수와 2차류와의 관계는 시행적으로 (5)식을 제시하였고, 한편 실용적으로는 유속, 수색, 수로폭, 조도등의 제수리량을 고려한 실험식 (8)을 제안하였다.

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Remedy for Reddening and Assimilation Phenomenon by Poisson Technique Using Preserving Object Colors (색상 보존 방법을 이용한 포아송 테크닉으로 인한 적화 현상 및 동화현상의 보완)

  • Jun, Woo-Gyoung;Lee, Yill-Byung;Lee, Bo-Hyun
    • Annual Conference of KIPS
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    • 2011.04a
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    • pp.501-504
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    • 2011
  • 현대에는 다양한 촬영 기기가 널리 사용되고 있으며 인터넷 등을 통한 이미지 파일 공유, UCC의 발달 등으로 인해 많은 사람들이 이미지 파일을 편집할 수 있는 툴을 원하게 되었다. 본 연구에서는 Drag and Drop을 통해 Poisson Technique을 이용한 Image Composition Program을 제안한다. Source Image와 Target Image 파일만 가지고 있으면 원하는 부분을 마우스를 이용해 선택하고 Drag and Drop 이라는 간단하고 가시적인 동작만을 취함으로써 원하는 위치에 원하는 그림을 자연스럽게 합성 할 수 있다. 또한 포아송 테크닉으로 인해 발생할 수 있는 동화현상 및 적화현상 등의 문제를 해결하는 방법을 제시한다.

Ultrastructural Studies of Germ Cell Developments and Atypical Cells Occurred During Spermatogenesis in the Acini, and the Cyclic Changes in the Epithelial Cells With the Developmental Phases of the Seminal Vesicle in Rapana venosa (Valencienes) (피뿔고둥 Rapana venosa (Valencienes) 정소소엽 내에서의 생식세포 발달과 정자형성과정 중 출현하는 비정형 세포들의 미세구조적 연구 및 저정낭의 발달단계에 따른 상피세포들의 주기적 변화)

  • Lee, Il Ho;Chung, Jae Seung
    • The Korean Journal of Malacology
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    • v.31 no.1
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    • pp.9-19
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    • 2015
  • Germ cell development and cyclic changes in the epithelial cells of the seminal vesicle of the male rapa whelk, Rapana venosa, were investigated by cytological and histological observations. The process of germ cell development can be classified into five stages: (1) spermatogonial, (2) primary spermatocyte, (3) secodary spermatocyte, (4) spermatid, and (5) spermatozoon. In particular, four atypical cells (Type IA, IB, IIA and IIB cells) occur among normal germ cells in the acini during spermatogenesis. Presumably, the atypical cells, which have lysosome-like vacuoles or lysosome-like bodies in the cells, are involved in breakdown and absorption themselves in the acini. However, atypical cells were not found in the epithelial cells of the inner layer of the seminal vesicle. A considerable amount of spermatozoa are transported from the testis towards the the seminal vesicles until late July. The main coupulation period is between June and July. The process of the cyclical changes of the seminal vesicles can be classified into three phases: (1) resting, (2) accumulating, and (3) spent. Yellow granular bodies are involved in resorption or digestion of residual spermatozoa.

Career Development Experience of Youth in Late Adolescence who Entered a Different University after Taking a Semester off (반수로 대학에 진학한 후기 청소년들의 진로발달 경험 : 도돌이표를 지나도 반복되는 길)

  • Kim, Seo Hyun;Yim, Hye Rim;Myung, So Yeon;Chung, Ick-Joong
    • Korean Journal of Social Welfare Studies
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    • v.47 no.4
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    • pp.183-216
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    • 2016
  • This study aims to investigate the career development experience of youth in late adolescence who entered a different university after taking a semester off (as known as Bansu in Korean), in depth, applying a phenomenological research method. For the research, this study selected seven adolescents as research participants to reveal the essential meaning of their experience, vividly. The data were analyzed by Giorgi's method to draw components of the experience of research participants. As a result of the research, the career development experience of youth in late adolescence who entered a different university after taking a semester off was systematized into 19 sub-categories and structured into four main categories: "high school years in which academic record was more important than aptitude", "the step away from the dream, being forced to proceed to college", "the time of study to take the exam again, which was an advantage and disadvantage at the same time" and "the wish unfulfilled even with the success of entering a different university." It turned out that the main topic was "the repeated way even after passing the repeat sign." They took the College Scholastic Ability Test (CSAT) once again and came back to the narrow way to enter a prestigious university, but they still compromised the standard made by the older generation. This study has significance for late adolescents' welfare and happiness in that it explored the in-depth meanings of the career development experience of youth who entered a different university by taking the CSAT again after taking a semester off. Lastly, based upon the situation of the increase in the number of students who take the CSAT again, this study suggested better measures for career development during adolescence and the promotion of their quality of life.

Item Response Analysis of Energy as a Cross-Cutting Concept for Grades 3 to 9 (기초공통개념으로서 에너지에 대한 3~9학년 학생들의 문항 반응 분석)

  • Kim, Youngmin;Kang, Nam-Hwa;Kang, Hunsik;Maeng, Seungho;Lee, Jun-Ki
    • Journal of The Korean Association For Science Education
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    • v.36 no.6
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    • pp.815-833
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    • 2016
  • This study investigated children's (grade 3 to 9) responses to assessment items on energy as a cross-cutting concept in order to get basic information for a learning progression. The assessment consisted of 8 ordered multiple-choice items at the contexts of electric circuit, mechanical energy of falling objects, phase change of matter, dissolution, biological phenomena of a lizard, food chain, radiative equilibrium between Sun and Earth, and the system of water cycling. Children's responses to each item were analyzed with using cross-tabulations in terms of grades and item option levels and Wright map and Differential item functioning based on Rasch modeled item response analysis. The results offered empirical evidence of children's development of understanding energy from relation between energy and its phenomena, types of energy, transfer and conversion of energy, towards conservation and equilibrium of energy for all of eight contexts. Children of each grade did not fully understand energy conservation. As grade goes up, their understandings of energy transfer and conversion were differentiated across the contexts and topics of energy. According to Rasch analysis, children had easier understanding of energy on dissolution and poorer understanding of energy on water cycling than that on other contexts. It was discussed and suggested that the results of this study help us organize science topics with regard to energy when developing new national science curriculum.

Influence of long period waves on sediment suspension in the surf zone (쇄파대에 있어서 부유사에 미치는 장주기 성분파의 영향)

  • 신승호;율산선소
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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    • 2003.08a
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    • pp.216-221
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    • 2003
  • 황천 시에 쇄파대 내에서 발달한 장주기파는 전빈의 침식에 직집적인 원인이 되는(가여 1992) 등, 쇄파대 내의 표사현상에 큰 영향을 미친다. 쇄파대 내의 부유사 농도가 장주기 변동을 하는 것은 가여ㆍ전중(1983), 시소 등(1985) 등에 의해 현지에서 관측되어 있다 또한 Beach and Sternberg(1988, 1991)는 장주기파가 발달한 때의 쇄파대 내 부유사 농도가 장주기파가 발달하지 않은 경우에 비해 3-4배의 값을 나타내는 것을 지적하면서 장주기파에 의한 내외해 방향(cross shore direction) 부유사 flux의 방향이 주파수나 저면으로부터의 높이에 의해 변화함을 제시하였다. (중략)

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A Study on Cooling and Freezing During Summer Season in Deoksan-ri Eoreumgol (ice valley) Yeongdeok-gun (South Korea) (영덕군 덕산리 얼음골의 냉각 및 하계 결빙현상에 관한 연구)

  • Lee, Jin Kook;Shin, Jae Ryul;Jang, Yun Deuk
    • Journal of the Korean association of regional geographers
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    • v.21 no.3
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    • pp.608-617
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    • 2015
  • This paper synthetically analyzes micrometeorological data and geomorphological features of Doeksan-ri Eoreumgol(ice valley) Yeongdeok-gun in order to investigate occurrence characteristics of the ice valley and a mechanism for freezing in summer. This ice valley is located in the distal end of a talus and intensity of cooling and freezing in summer seems to be related to morphology and dimensions of talus. Cooling in the ice valley is generated by cold air flows that move down to the bottom of talus from high mountains through pores and voids, then debris in talus is supercooled by the cold air. For it forms a stable state in and around voids cold air is stagnating in the lower end of talus. This causes freezing in summer at outpour points. Furthermore humidity condition of external air and vaporization heat is a key factor when freezing.

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