• Title/Summary/Keyword: life history research

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Characteristics on Spawning-Host Selection and Early Life History of Sarcocheilichthys nigripinis morii (Pisces, Cyprinidae) (중고기(Sarcocheilichthys nigripinis morii)의 산란숙주 선택 및 초기 생활사 특성)

  • Kang, Eon-Jong;Yang, Hyun;Lee, Heung-Heon;Kim, Eong-Oh;Kim, Chi-Hong
    • Korean Journal of Environmental Biology
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    • v.25 no.4
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    • pp.370-377
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    • 2007
  • The spawning host selection and adaptive characteristics in life history were investigated for Sarcocheilichthys nigripinnis morii which has similar habit of spawning with acheilognathine fishes. The fertilized eggs of the species were found in the mantle cavity of Corbicula papyracea and C. fluminea among the bivalves collected from same locality, meaning the species specific host selection for the spawning. We considered that the differences in the status of expanding egg membrane after hydration, fewer number of eggs settled into the mantle cavity and having eleutheroembryo with developed organ would be some evidences of specific reproductive strategy for this species. But the status of developed surface blood circulation was thought to be a compensation for the parasitism. The pigmentation of melanopore delayed to late embryo and the spot on the caudal region was a characteristics of this species appeared in the early life history.

Meaning and Use of Housing Through Life History I : Focused on the Meaning of Housing (생애구술을 통해 본 주거의 의미와 사용 I : 주거의 의미를 중심으로)

  • Hong, Hyung-Ock;Yang, Sew-Ha;Jun, Nam-Il
    • Journal of Families and Better Life
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    • v.27 no.1
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    • pp.45-60
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    • 2009
  • This study was designed to examine the meaning of housing in modern Korea, and to draw the interrelationship of people and housing. In-depth interviews were conducted, and the qualitative research investigated various aspects of housing history among four individuals during the different phases of social and economic transitions. Each narratives showed the unique characteristics of life history, and the conceptual frameworks for interpretation were microsociological approach by Morris and Winter(1978) and pathway approach by Clapham(2005). One narrater named "K" had gone through various housing experiences since her birth in 1933 at a traditional Korean housing, and she moved to a traditional rural community. Another narrater called "S" was born in housing built during the Japanese colonization, gained wealth through the housing boom of the industrialization, and has lived in a suburban condominium. "G" spent her entire life in an urban area, had never owned a house, and lived in a house with poor quality. The other narrater named "L" had lived in a single-family home with a large yard since her childhood, and she has resided in multi-family housing by herself after having a lot of experiences of building houses. The results revealed that housing could play as a simple role as a shelter, be transformed over family life cycle, become prestige of extended family, social and family status, investment. Meaning of housing from the pathway approach were closely related to hometown, the relation to birth family at postmarriage, economic status, and housing experiences according to the social change. As a conclusion, the meaning of housing is vary, and housing conveys numerous implications including psychological, social and economic aspects.

Spawning Behavior and Early Life History of Endangered Cottus hangiongensis (멸종위기에 처한 한둑중개(Cottus hangiongensis)의 산란습성 및 초기생활사)

  • Seo, Won-Il;Yoo, Dong-Jae;Byun, Soon-Gyu;Kim, Yi-Cheong;Lee, Sung-Hun;Yeon, In-Ho;Han, Kyeong-Ho;Yim, Hu-Soon;Lee, Bae-Ik
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.43 no.1
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    • pp.46-53
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    • 2010
  • Spawning behavior and early life history of the tuman river sculpin, Cottus hangiongensis were studied in the laboratory and in the field at Wangpi Stream, Gyeongsangbuk-do, Korea, from January to December, 2007. The spawning ground was in the lower Wangpi Stream, which is a shallow region about 40cm or less in depth. During the spawning period, from March to April, mature males made nest cavities under stone 10 which they led a gravid female. The male and female then turned upside down, and spawning and fertilization occurred onto the ceiling of the nest cavity. After spawning, the male chased the female from the nest and mated with several other females. Fertilized eggs were spherical in shape, demersal, adhesive, transparent and yellow in color, measuring 1.86 mm (1.79~1.93 mm) in diameter. A mean of 17(12~22) various-sized oil globules were counted in the yolk. Granular materials formed a mass in the yolk. Fertilized eggs hatched at 256 hrs, 10 minutes after the morula stage under water temperature of $15.0{\sim}18.0^{\circ}C$. Newly hatched larvae 9.34 mm (9.02~9.69 mm. n=10) in total length (TL) had a large yolk At 14 days after hatching, larvae 11.40 mm (11.07~11.72 mm, n=10) in TL transformed to the postlarval stage. At 41 days after hatching, postlarvae of 18.42 mm (17.31~18.62 mm, n=10) in TL had reached the juvenile stage. The result of this study indicate that Cottus hangiongensis has the spawning ground in the lower stream and the amphidromous life history which is the different from that of Cottus poecilopus.

Comparison in Spiritual Well-being and Quality of Life between Hospital and Home Hospice Patients (병동호스피스 환자와 가정호스피스 환자의 영적 안녕과 삶의 질 비교)

  • Kim, Bok Hee;Park, Heeok
    • Research in Community and Public Health Nursing
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    • v.24 no.3
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    • pp.292-301
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    • 2013
  • Purpose: The purpose of this study was to compare the spiritual well-being and quality of life between hospital and home hospice patients. Methods: A total of 116 patients from 4 hospice hospitals in D city and P city participated in this study from January to April 2012. To measure spiritual well-being, an instrument developed by Paloutzian and Ellison (1982) and revised by Park (2005) was used. To measure quality of life, an instrument developed by Cho (1993) and revised by Sun (2003) was used. The data were analyzed by using descriptive statistics, t-test, $x^2$-test, and ANCOVA. Results: Spiritual well-being and quality of life were higher in home hospice patients than in hospital hospice patients, but they were not statistically significant. Higher education and having religion were significantly related to higher spiritual well-being in both groups. Having religion and pain history for the past one week were significantly related to higher quality of life in both groups. Conclusion: For hospice patients, participation in religious activities needs to be encouraged to improve their spiritual well-being and quality of life. Assessing the hospice patients' pain history with close observation and managing the pain are suggested.

A Study on University's Management of the Founder's Private Records (대학의 설립자 개인기록 관리에 관한 연구)

  • Oh, Euikyung
    • Journal of Korean Society of Archives and Records Management
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    • v.17 no.1
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    • pp.143-161
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    • 2017
  • This research has been conducted under the premise that private records can supplement public records. It recognized that important records of a university could be supplemented with not only administrative records, but also with private records of persons related to the university. The analysis of the founders' life history research was used to establish the classification system of private records and collection strategies. The life history of the founders of the university was analyzed and utilized for the classification system of records and the construction of the collection strategy. This research proposes a multiclassification system with function, subject, and type as the criteria of the classification system, and uses keywords derived from the classification system as a starting point of searching for future record collection and deducing them as potential collectors and producers. Although it cannot be a standard for all private records, it can be considered a significant attempt that takes the diversity of private records into account.

Valvular Pulmonic Stenosis with Congestive Heart Failure in a Fox Terrier (폭스테리어 종에서의 울혈성 우심부전을 동반한 판막형 폐동맥판 협착증)

  • Jung, Dong-In;Park, Ki-Tae;Wang, Ji-Hwan;Kim, Young-Ki;Lee, Kyung-Woo;Yeon, Seong-Chan;Lee, Hyo-Jong;Lee, Hee-Chun
    • Journal of Veterinary Clinics
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    • v.28 no.1
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    • pp.133-138
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    • 2011
  • A 4-year-old female Fox Terrier dog (weighting 8 kg) with history of severe abdominal distention and anorexia was presented to Veterinary Teaching Hospital, Gyeongsang National University. In physical examination, grade 4/6 systolic murmur heard at the left heart base. Electrocardiography showed right ventricular enlargement (right axis deviation and deep S wave) and right atrial enlargement (P pulmonale). Diagnostic imaging studies revealed hypertrophy of right ventricle, enlargement of right atrium and tricuspid regurgitation and turbulence in the pulmonary artery in right parastenal short axis view. Based on the diagnostic findings, the dog was diagnosed as a case of valvular pulmonic stenosis.

Toward the Cultural Approach to the Discipline of Korean Design History: -A Plea for the Domestic Handcrafts of Yang, Gap-Jo- (한국디자인사 연구의 문화사적 접근을 향하여 -양갑조 할머니의 규방 공예품을 위한 변론-)

  • Ko, Young-Lan
    • Archives of design research
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    • v.17 no.4
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    • pp.375-384
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    • 2004
  • The general tendency of approach to Korean Design History has been focusing its primary interest on the grand story in relation to the problems of modernization in political, economical and social aspects of Korea. In the discourse of modernization, however, there are two sides immanent in the modernization: there is the formal, institutional and authoritative modernization developed inside the capitalistic mode of production and the informal, individual and cultural modernization manifested in the mode of everyday lives. Especially, despite the viewpoint of the latter being embossed as an alternative approach in various areas including the academic world of history since the collapse of socialism, the historical recognition of the phenomena of modern design by the Korean design historians is more like the 'history from the above' that exists at the level of the discourse outside the reality rather than the 'history from the below' that exists within the ordinary life. To grant a sense of balance in such frame of historical understanding, it requires the restructuring the design history of Korea through the cultural perspectives from having the representation of mundane lives realized by the voluntary design activity of the common people as research subjects. One of the methods to acquire an answer to such problem is decoding, in the manner of 'cultural history', the life-long domestic artifact made by Madame Yang, Gap Jo (currently 87 years of age) who is a model of typical Korean mother. Through the historical rumination on the traces of unpretentious lives of the people that has been buried under the grand narrative of the Korean Design History, a new era aimed for the historical prospect of Korean design as cultural history will be possible by excavating the petit yet multi-layered meaning of Korean designs.

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Evolution of Social Life in Wood-Eating Cockroaches (Cryptocercus spp.) : Effects of the Winter Climate on the Evolution of Subsociality

  • Park, Yung-Chul;Choe, Jae-Chun
    • Journal of Ecology and Environment
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    • v.31 no.2
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    • pp.97-105
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    • 2008
  • Subsocial behavior of the genus Cryptocercus cockroaches has been believed as primitive traits of termite eusociality. Thus, it has been believed that understanding Cryptocercus subsociality is a pre-requisite stage to infer evolutionary route of the eusociality in termites. Woodroaches of Cryptocercus are also well known because of its peculiar characteristics including adults living monogamously in pairs, semelparous reproduction, xylophagy, obligatory association between adults and their offspring, slow development, and anal trophallaxis by adults. Based on the previously accumulated data, we try to understand two major components of Cryptocercus life history, development and reproduction. We hypothesize that harsh winter and length of winter might be one of the main causes driving the appearance of the delayed development and semelparous reproduction in Cryptocercus life history.

Effects of abiotic stressors on kelp early life-history stages

  • Lind, Alyssa C.;Konar, Brenda
    • ALGAE
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    • v.32 no.3
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    • pp.223-233
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    • 2017
  • Kelp forests and the many vital ecosystem services they provide are threatened as the severity of climate change and other anthropogenic stressors continues to mount. Particularly in the North Pacific, sea surface temperature is warming and glacial melt is decreasing salinity. This study explored the resiliency of early life-history stages of these foundation species through a factorial laboratory experiment. The effects of rising sea surface temperature under low salinity conditions on kelp spore settlement and initial gametophyte growth in Eualaria fistulosa, Nereocystis luetkeana, and Saccharina latissima were investigated. Decreased settlement and growth were observed in these species at elevated temperatures and at low salinity. Eualaria fistulosa spores and gametophytes were the most negatively impacted, compared to the more widely distributed N. luetkeana and S. latissima. These results suggest that N. luetkeana and S. latissima could potentially outperform E. fistulosa under projected conditions. However, despite decreased performance among all species, our findings indicate that these species are largely resilient to temperature changes when exposed to a low salinity, even when the temperature changes are immediate and extreme. By exploring how early life-history stages of several key kelp species are impacted by dual stressors, this research enhances our understanding of how kelp forests will respond to projected and extreme changes in temperature when already stressed by low salinity.

Egg Development and Early Life History of Korean Endemic Species Korean Spotted Sleeper, Odontobutis interrupta (Pisces: Odontobutidae)

  • Park, Jae-Min;Han, Kyeong-Ho;Kim, Na-Ri;Yoo, Dong-Jae;Yun, Seong-Min;Han, Ji-Hyeong
    • Development and Reproduction
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    • v.18 no.4
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    • pp.259-266
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    • 2014
  • The egg development and early life history of Korean spotted sleeper, Odontobutis interrupta which is Korean endemic species from Sora-choen was investigated. The Korean spotted sleeper were caught at Sora-myeon, Yeosu-si, Jeollanamdo, from Korea at May in 2014. The fertilized eggs were $4.23{\pm}0.05mm$ in long diameter and had oil globules. Hatching time of the embryo began about 442 hr 14 min after fertilization under water temperature of $19.5^{\circ}C$. The newly hatched larvae were $4.27{\pm}0.35mm$ in total length and their anus were not yet opened. 3 days after hatching postlarvae was measured $6.20{\pm}0.11mm$ in total length. 10 days after hatching postlarvae was measured $6.69{\pm}0.14mm$ in total length.