• Journal of Sericultural and Entomological Science
• /
• v.37 no.1
• /
• pp.10-15
• /
• 1995

Genetic characterization of Sri Lankan silkworm bivoltine population has not been at-tempted so far, since its sporadic introduction of bivoltine strains into the island, starting from the 1950's. Genetic structure of Sri Lankan population of mulberry silkworm Bombyx mori was investigated through estimation of general (GCA) and specific combining ability(SCA) and heritability(${h^2}_B$), on the economic quantitative characters from leading 8 inbreds and their 28 F1's in a half diallel cross, in an attempt to utilize the estimates in determination of future breeding methods and to predict the breeding value over the phenotypic value. It was found that the breeding population of the bivoltine silkworm in Sri Lanka has still maintained considerable amounts of additive gene action as well as nonadditive. For some time in the future, both breeding strategies of "selection without inbreeding" and also "inbreeding followed by crossing" should therefore be effective in genetic improvement of economic characters investigated. In addition, superior combiners in general and in specific F1′s were identified for each of 6 economic characters, to be immediately utilized in selection and also in cross breeding programs in Sri Lanka.

• Tuberculosis and Respiratory Diseases
• /
• v.74 no.3
• /
• pp.104-110
• /
• 2013

Background: Notified tuberculosis (TB) cases in Korea have not decreased over the last decade (2001-2010). Methods: To clarify the reasons, we analyzed an annual report on notified tuberculosis patients and age-specific population drift in Korea. Results: Compared to the age-specific notified TB cases between 2001 and 2010, distinctive features in notified TB cases and new cases increased markedly in people aged 45-54 years and in patients over 65 years old, whereas those between 15-34 years in 2010 decreased drastically. In particular, notified TB individuals over 65 years old occupied 29.6% of the cases in 2010, which was 1.5 times higher than that in 2001. The main reason not to decrease in notified TB patients for the last decade (2001-2010) was due to the increasing elderly population as well as the aging of baby boomers, which have a higher risk of TB development. Conclusion: Korea needs to pay attention to the older population in order to successfully decrease the burden of TB in the future.

• Journal of Environmental Science International
• /
• v.14 no.4
• /
• pp.367-371
• /
• 2005

Soil samples were collected from new-developed wetland soil ecosystem of Tamarix chinesis plantation in Chinese Yellow River Delta in different months of 2003. Soil characteristics, temporal change and spatial distribution of microbial community composition and their relationship with nitrogen turnover and circling were investigated in order to analyze and characterize the role of microbial diversity and functioning in the specific soil ecosystem. The result showed that the total population of microbial community in the studied soil was considerably low, compared with common natural ecosystem. The amount of microorganism followed as the order: bacteria> actinomycetes>fungi. Amount of actinomycetes were higher by far than that of fungi. Microbial population remarkably varied in different months. Microbial population of three species in top horizon was corrected to that in deep horizon. Obvious rhizosphere effect was observed and microbial population was significantly higher in rhizosphere than other soils due to vegetation growth, root exudation, and cumulative dead fine roots. Our results demonstrate that microbial diversity is low, while is dominated by specific community in the wetland ecosystem of Tamarix chinesi.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2007.11a
• /
• pp.1129-1133
• /
• 2007

Assessment of noise exposed population is a method for checking the degree of environmental noise and social influence in order to reduce the risks such as annoyance and disturbance that are generated by environmental noise. Also, this method suggests the preferential noise reduction policy and action plan by accurately assessing the area that noise causes harm to human health. Recently, a noise map, which can predict noise in comprehensive areas, is used for the assessment of noise exposed population, breaking from the methods using existing measures. In particular, countermeasure for the noise can be considered more effectively by using assessment methods of noise exposed population for specific noise levels, areas, and building types which are the main input factors in noise maps. In this study, Assessment methods of noise exposed population by using 2D noise map are compared with those by 3D noise map.

• Proceedings of the Korean Society of Developmental Biology Conference
• /
• 2001.08a
• /
• pp.34-35
• /
• 2001

RAPD analysis based on numerous markers have been used to investigate patterns of genetic differentiation ann and within two cultured and wild populations represented by the species crucian carp(Carassius carassius). From RAPD analysis using five primers, a total of 442 polymorphic bands were obtained in two populations and 273 were found to be specific to a wild population. According to RAPD-based estimates, average number of polymorphic bands in wild population was approximately 1.5 times as diverse as that in cultured. The average level of bandsharing values was $0.40 \pm 0.05$ in wild population, but was $0.69 \pm 0.08$ in cultured population, With reference to bandsharing values and banding patterns, wild population was considerably more diverse than cultured population. Knowledge of the genetic diversity of crucian carp should help in formulating more effective strategies for managing this aquacultural fish species.

• The Journal of Pediatrics of Korean Medicine
• /
• v.18 no.1
• /
• pp.221-246
• /
• 2004

Objective: The purpose of this study was to investigate the effects of Kamikwiryongtang (KKT) on the immune response and growth in a young mouse (3 weeks mice). Methods The viability of thymocytes and splenocytes in vivo and in vitro system, the population of helper T (Th) cells and cytotoxic T (Tc) cells in thymocytes and increased the population of T-lymphocytes and the population of Th cells in splenocytes, the production of ${\gamma}$ -interferon, interleukin-2 and interleukin-4 in splenocytes was investigated. KKT (500mg/kg) was administerd p.o. once a day for 7 days. Results: KKT increased the viability of thymocytes and splenocytes in vivo, but did not affect the viability of thymocytes and enhanced the viability of splenocytes in vitro system. In addition, KKT did not affect the population of helper T (Th) cells and cytotoxic T (Tc) cells in thymocytes and increased the population of T -lymphocytes and the population of Th cells in splenocytes. Also, KKT increased the production of ${\gamma}$-interferon, interleukin-2 and interleukin-4 in splenocytes. Furthermore, KKT increased the production of nitric oxide in vivo, but did not affect the production of nitric oxide in vitro system. KKT enhanced the phagocytic activity of peritoneal macrophages in vivo, but decreased the phagocytic activity in vitro system: KKT increased the body weight of a young mouse. Conclusions: KKT stimulates the specific immune response via increase of, the viability of thymocytes and splenocytes and the non-specific immune response via increase of phagocytic activity of peritoneal macrophages and stimulates the growth of a young mouse.

• Journal of Preventive Medicine and Public Health
• /
• v.38 no.1
• /
• pp.38-44
• /
• 2005

Objective : To compare the mortality rate of Korean medical doctors to that of the general Korean population for the period 1992-2002. Methods : The membership records of the Korean Medical Association were linked to the 1992-2002 death certificate data of Korea s National Statistical Office using 13-digit unique personal identification numbers. The study population consisted of 61,164 medical doctors with a follow-up period of 473,932 person-years. Standardized mortality ratios(SMRs) were calculated to compare cause-specific mortality rates of medical doctors to those of the general population. Results : We confirmed 1,150 deaths at ages from 30 to 75 years from 1 January 1992 to 31 December 2002. The SMR for all-cause of death was 0.47(95% CI : $0.44{\sim}0.50$). The SMRs for smoking-related diseases such as cerebrovascular accidents and chronic obstructive pulmonary disease were smaller than the SMR of all-cause of death. However, the SMRs for colorectal and pancreatic cancers were not significantly lower than those of the general population. Transport accidents and suicides accounted for 72% (94 of 131) of external causes of death. The SMR for suicide was 0.51 (95% CI : $0.38{\sim}0.68$). Conclusions : The mortality rate of South Korean medical doctors was less than 50% that of the general population of South Korea. Cause-specific analysis showed that mortality rates in leading causes of death were lower among medical doctors although differences in mortality rates between medical doctors and the general population varied with the causes of death. These health benefits found among medical doctors may be attributable to the lower level of health damaging behaviors (e.g., lower smoking rates) and better working conditions.

• Korea journal of population studies
• /
• v.30 no.3
• /
• pp.1-31
• /
• 2007

Korea, China and Japan have been undergoing economic development, demographic transition and population aging, in a speed unparalleled in world history. This paper examines, for each of these countries, on (i) the trend and prospect of the effective dependency burden (EDB) in terms of stable population and (ii) the optimum fertility path which will lead to a stable population with the minimum level of EDB under the trend and prospect of decreasing age specific mortality rates. It then evaluates (iii) the transitory EDB costs of pro-natal policies during the adjustment process of stabilization and (iv) the effectiveness of other supplementary policies which influence EDB parameters.

• Journal of Environmental Health Sciences
• /
• v.22 no.3
• /
• pp.49-55
• /
• 1996

Water parsley(Oenanthe javanica(Blume) DC) was raised with varying population density(S) in the laboratory aquarium unit to determine the growth equation. The population density was measure after 7 days. The resultant growth curve was well fit to the equation 1/S = A+B (1/S0) with a high correlation coefficient ($R^2$ = 0.999). The maximum specific absorption rate was $9.011 \times 10^{-5}$ kg $NO_x-N/kg$ water parsley$\cdot$day and $1.31 \times 10^{-5}$ kg $PO_4-P/kg$ water parsley$\cdot$day when the average population density was $2.62 kg/m^2$. The relationship between population density and nutrient absorption rate, the absorption rate of $NO_x-N$ was 5.04~5.24 mg/l$\cdot$day when the population density was $7.51~10.0 $mg/m^2\cdot day$ and the absorption rate of $PO_4-P$ was 0.56~0.78 mg/l$\cdot$day when the population density was 5.02~10.0 $kg/m^2\cdot day$. Taking into account the nutrient absorption rate and growth rate, the population density between $7.0 kg/m^2\cdot day$ and $8.0 kg/m^2 \cdot day$ was selected. The removal rate of nutrient was investigated after 7 days culture. Removal rate of $NO_x-N$ was 95.6~99.95% with initial concentration of 35 mg $NO_x-N/l$, and the removal rate of $PO_4-P$ was also high, indicating 80.24~98.9% with initial concentration of 5.95 mg $PO_x-P/l$.

• Journal of Environmental Science International
• /
• v.28 no.12
• /
• pp.1123-1131
• /
• 2019

In this study, we investigated the spatial range, distribution pattern, temporal appearance, sex ratio, seasonal pattern, and size of the population of Leptalina unicolor locally inhabiting the wetland protection area in the Jaeyaksan Mountain. We found that the butterfly was distributed across four areas at 750 m above sea level and in an area of 96,000 ㎡. in the southeastern slope of the mountain. The discontinuous distribution of the butterflies in the meadow. According to our survey conducted from 2012 to 2014, L. unicolor occurred in May (spring) and July (summer) each year, with the male population more than three times higher than that of the female population. The population size estimated using the mark and recapture method on the back of the hind wing in the two years was as follows: 877±502 and 1243±800 individuals in the spring and summer of 2012, respectively, and 783±429 and 506±365 individuals in the spring and summer of 2014, respectively, suggesting no specific seasonal pattern. The findings of this study are expected to be useful for the conservation of the populations and habitats of L. unicolor, which are currently distributed locally due to a decrease in population size.