• 한국동물학회지
• /
• 제32권3호
• /
• pp.242-251
• /
• 1989

한국 특산종 Cobitis kireensis의 두 아종 C. k. koreensis와 C. k. pumilus의 지리적 변이 및 아종의 위치를 규명하기 위하여 남한의 6개 집단에서 채집된 457개체를 대상으로 형태 형질 분석 및 전기영동법에 의한 유전적 변이를 조사하였다. 형태형질의 계측, 계수 및 discriminant function 분석에서 집단 간 및 아종 간의 유의한 차이는 발견되지 않았다. 각 집단 간 유전적 변이는 평균 A=1.5, P =37.3%, HD=0.053, 및 HG=0.097로 타 어류군이 변이정도보다 다소 높은 편이었으나 C. k. pumilus는 A= 1.2, P=19.0%, HD=0.029, 및 HG=0.078로 변이정도가 매우 낮았다. 두 아종 간의 평균 유전적 근연치는 S=0.894로 C. k. koreensis 5개 집단간 평균 유전적 근연치 S=0.894와 거의 동일하였으며 아종 간에 유전적 차이가 없었다. 따라서 C. k. pumilus를 아종으로 분류하는 것은 부적합하다고 사료된다.

• 한국인구학
• /
• 제26권1호
• /
• pp.143-170
• /
• 2003

지난 몇 십 년 간에 걸쳐 한국 사회에서 남성들은 물론 여성들의 교육수준은 급속하게 증가하였다. 본 연구는 이러한 배경을 염두에 두면서 여성들의 교육수준이 첫 직업획득에 어떠한 영향을 끼치며 또 그것은 어떠한 양상으로 변하였는지 살펴본다. 이를 위해 한국여성개발원에서 2001년에 수집한 $\ulcorner$제4차 여성취업실태조사 원자료$\lrcorner$를 이용해 노동시장에 처음으로 진입한 시점을 기준으로 1980년 이전, 1980년대, 그리고 1990년대 코호트를 구분하였다. 우선, 코호트별로 상이한 교육과 직업의 분포를 통제한 후 교육과 직업의 전반적인 연관성을 파악하기 위해 대수선형모형(log-linear model) 분석을 시도하였다. 그 결과 최근 코호트로 올수록 교육과 직업의 전반적인 연관성이 약화되는 것으로 나타난다. 이어 OLS 회귀분석을 통해 각각의 교육수준이 직업위세점수에 미치는 영향을 살펴보았으며, 분석결과는 교육수준간 직업위세점수 차이가 최근 코호트로 올수록 감소하였다는 것을 보여준다. 결론적으로 본 연구는 그간 한국 사회의 급속한 교육팽창의 맥락 하에서 여성의 교육과 직업의 연관성이 점점 약화되어왔다는 것을 보여준다.

• Fisheries and Aquatic Sciences
• /
• 제9권3호
• /
• pp.107-114
• /
• 2006

A dermal sarcoma was found in a freshwater, soft-shelled turtle Pelodiscus sinensis. The neoplasm consisted of proliferating fibrous tissue and extended from the dermis. The overlying epidermis was hyperplastic and partially folded. The deeper dermis and hypodermis contained three large, discrete necrotic foci of -10 mm diameter. Numerous eosinophilic granule cells and macro phages surrounded the necrotic areas. A mixed population of cells with nuclear pleomorphism was observed between the papillary layers of vessels. This area also had regions of different histological structures: (l) regularly arranged, spindle-shaped cells with compact nuclei in a fine-fibrillar matrix; (2) haphazardly arranged cells ($\leq$ 23 11m diameter) with ovoid, highly hypertrophic, faintly stained nuclei; and (3) cells (3.6-5.8 11m diameter) with irregularly shaped nuclei and marginal condensed chromatin in a myxomatous matrix. Some mitotic figures, binucleate cells, and multinucleate giant cells of up to 50 11m in length were also found. Flow cytometry of propidium iodide-stained cells yielded different histograms for the normal skin and the skin (primarily epidermis) and fibrous dermis of the tumor, indicating DNA heterogeneity in the dermal portion of the tumor. The ploidy indices for the dermal cells were 1.91 and 0.78, as compared to normal cells.

• 한국의류학회지
• /
• 제32권10호
• /
• pp.1535-1547
• /
• 2008

The purpose of this research Is to inquire into the aspects of consumers' perception of age and their lifestyle and to reveal the effect of variability in spending behaviors themselves. A survey was carried out regarding the consumers of the new elderly generation aged 55 and above. 561 respondents were surveyed. residing in Seoul and Metropolitan areas. Factor analysis from the exploratory reconnaissance, Cronbach's $\alpha$, K-average community and multivariate analysis, multi-recurrence and crossing analysis($\chi^2$ verified), were used for statistics analysis. In conclusion, the cognitive age only shared a marginal relationship with lifestyle, most people in their forties stood out in this part of the research. The change of the cognitive age and lifestyle of the new elderly generation is expected to be a variable in the clothing purchasing behavior in the future. As the population of the new elderly generation increases, there is a need for changing views towards the new elderly generation and there is no doubt that it is a main target within marketing trends in the elderly generation industry.

• Journal of Ecology and Environment
• /
• 제36권1호
• /
• pp.19-29
• /
• 2013

Cicuta virosa is an endangered species in Korea, which is a southern marginal area. To conserve and restore habitats of this plant, we investigated water and soil environmental characteristics and vegetation at four habitats during the growing season. The C. virosa habitats differed in community structure, water and substrate properties, and water regime. Although the total distribution ranges of the water and soil environments for C. virosa were wide and overlapped with the optimal environmental range of distribution of accompanying species, the optimal water level range for C. virosa was defined as $7{\pm}3.5$ cm. Water level was adjusted by substrate structure such as a mound of P. japonica and a floating mat comprised of accompanying species. A floating mat was an aid to maintain an optimal and stable water level in deep or fluctuating water and to prevent strong competition with prolific macrophytes. The GS sampling site, which had floating mats, could be a good model for C. virosa conservation in a warm temperate region, whereas the PC sampling sites, which experienced a water shortage in spring, provided a clue about the decline in C. virosa population size.

• 한국산림과학회지
• /
• 제99권2호
• /
• pp.235-243
• /
• 2010

Picea jezoensis with several infraspecific taxa is indigenous to Eastern Asia and the Far East of Russia. Although these taxa are very common, the taxonomic confusion surrounding this complex is reflected in ambiguity of the various taxonomic treatments currently used. Patterns of intraspecific variations of cone morphology and recognition of taxa within the P. jezoensis complex were investigated from 175 individuals. Morphological variation of cone characters was determined by the univariate analysis to be insignificant in separating most previously recognized infraspecific taxa in Korea, China, Russia, and Japan. Our statistical analysis showed that cones from northern populations were larger and wider than those from southern populations. Individuals from South Korea were predominantly smaller even than those from Honshu of Japan which were previously recognized as var. hondoensis. All measured characters appeared to show some clinal variation with changes in latitude, and a distinctive trend was evident. Consequently var. hondoensis, var. koreana, and var. microsperma cannot retain their infraspecific state within the P. jezoensis complex.

• Animal Systematics, Evolution and Diversity
• /
• 제27권2호
• /
• pp.115-122
• /
• 2011

The morphology of the two marine hypotrichous ciliates Apokeronopsis bergeri and A. ovalis, isolated from the Yellow Sea, Korea, are described based on live and protargol-impregnated specimens. It is the first time that these species have been recorded in Korea. In addition, the small subunit ribosomal RNA gene was sequenced for comparison with the public database. The genus Apokeronopsis has recently been established in the family Pseudokeronopsidae, and the two congeners of the Korean population share the following characteristics: one row of one or more buccal cirri; usually two frontoterminal cirri; midventral complex composed of two distinctly separated rows; one left and one right marginal row; number of transverse cirri, more than eight; absence of caudal cirri; two types of cortical granules. Apokeronopsis bergeri differs from A. ovalis primarily in body shape (fusiform vs. oval form), size (usually $260{\times}80{\mu}m$ vs. $160{\times}55{\mu}m$), type II cortical granules (oval vs. round shape; yellow-green vs. mostly colourless and only a few yellow-green in colour), and morphometric data (75-106 vs. 53-70 in adoral membranelles; 37-47 vs. 24-36 in frontal cirri; 9-15 vs. 1-2 in buccal cirri), as well as molecular data (2.87% of pairwise distance).

• 응용통계연구
• /
• 제16권2호
• /
• pp.377-393
• /
• 2003

본 논문에서는 두 모비율의 차에 대한 기존의 신뢰구간들을 소개하고 붓스트랩 신뢰구간도 제안하였다 또한 모비율의 차에 대한 신뢰구간이 가지는 성질로서 근사신뢰구간의 하향추정의 문제와 정확신뢰구간의 상향추정의 문제점들을 확인하였고 평균포함 확률, 구간기대폭 그리고 왜도성 측면에서 종합적인 비교를 하였다. 특히 모수에 대한 사전분포를 가정하여 여러 신뢰구간들이 지니는 특징도 살펴보았다 기존의 신뢰구간들과 제안된 붓스트랩 신뢰구간은 소표본의 모의실험을 통하여 실제 포함확률의 평균을 기준으로 비교되었고 이항분포에서와 같이 정확신뢰구간이 지니는 보수성을 확인할 수 있었다. 신뢰구간의 평균포함확률의 등고선 그림도 소개하였다.

• Journal of Preventive Medicine and Public Health
• /
• 제41권3호
• /
• pp.200-207
• /
• 2008

Objectives : This study examined whether serious psychological distress (SPD) is associated with occupational injury among US employees. Methods : The employed population aged 18-64 years was examined (n=101,855) using data from the National Health Interview Survey (NHIS) 2000-2003. SPD was measured using the Kessler 6-item Psychological Distress Scale (K-6), a screening scale designed to identify persons with serious mental illness. The predicted marginal prevalence of psychological distress and occupational injury with the adjusted odds ratio were estimated using multiple logistic regression analyses. Results : The age-adjusted 3-month prevalence of occupational injury was $0.80{\pm}0.12%$ in workers with SPD, which was 37% greater than in workers without SPD ($0.58{\pm}0.03%$). The odds of occupational injury in workers with SPD were higher compared to workers without SPD (OR=1.34, 95% CI=0.93-1.92), after controlling for sex, age, race, education, occupation, and activity limitation by at least one medical condition. Male, service and blue collar occupation, and activity limiation by co-morbidity showed significantly higher odds of occupational injury for workers with SPD. Conclusions : The findings suggest that SPD accounts for an increased likelihood of occupational injury among US employees. A further longitudinal study is needed to differentiate the mechanism or causal pathways linking individual injury risk at the workplace, SPD, and socioeconomic factors.

• 한국수산과학회지
• /
• 제35권6호
• /
• pp.557-562
• /
• 2002

This study was to estimate population growth parameters of the freshwater bivalve, Corbicula (Corbiculina) papyacca (Heude) in Korea. Samples were collected from Jojong stream in Chungpyeong from September 1999 to August 2000. Ages were determined from the ring of shell, The shell length of the samples ranged from 4,2 mm to 28.1 mm, The ring on the surface of shell was formed once a year from January to March, Marginal increment analysis of shell rings indicated that annuli were formed in June. Spawning period was estimated to be May to August with a peak between June and July through fatness analysis, and thus rings were considered to be true annual marks. Von Bertalanffy's growth parameter were estimated from a nonlinear method with the value of logical maximum shell length ($L_{propto}$) was 34,36 mm, K was 0.1531/year, logical age of shell length 0 ($t_{0}$) was -0,5246 year, and logical maximum total weight ($W_{propto}$) was 11.42 g.