• The Korean Journal of Ecology
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• v.27 no.6 s.122
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• pp.325-333
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• 2004

Birds were censused to investigate the composition of landscape structure for bird diversity around Ulsan between May and November 2002. Associations with three main categories of habitat variables were evaluated: 1) amount and type of forest; 2) residual habitats not classified as forest or crops; 3) land-use variables. Cluster analysis of bird community shows the highest forest variables of $79.06\%$, and the others are residual habitat variables ($17.98\%$), land-use variables ($2.94\%$) in spring, and forest variables of $57.77\%$, land-use variables ($23.16\%$), residual habitat variables ($18.47\%$) in autumn, respectively. In Principal Component Analysis of a total of 196 sites, the populations are strongly correlated to Component I ($54.8\%$) based forest habitats and to Component II based on land-use. Species preferring sites were clearly separated with heterogenous forest along the first axis. In autumn, the populations are moderately correlated to Component I based land-use and to component II based forest habitats. Species preferring local habitats were also clearly separated. Fifty three species of 1,700 birds were recorded: Brown-eared Bulbul, Vinous-throated Parrotbill, Great Tit, Tree Sparrow and Black-billed Magpie accounted for over $60\%$ of the observed birds in spring and autumn. The important species were Brown-eared Bulbul, Vinous-throated Parrotbill, Great Tit and Tree Sparrow in spring and autumn. Four habitats in terms of their species richness were computed as follows: Wonhyosan has the highest an expected species number, $E[S_{59}]=19$. Moonsusan has the lowest expected species number, $E[S_{59}]=17$ in spring. In autumn, Kuenamsan has the highest expected species number, $E[S_{63}]=16$. Moonsusan has the lowest expected species number, $E[S_{63}]=12$. Pairwise similarity declined with increasing distance between recording site and recording site from Moonsusan-Wonhyosan (0.62), the same geographical regions clustered separately in a UPGMA cluster tree in spring, and in autumn from Moonsusan-ChungJoksan (0.53).

• Korea journal of population studies
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• v.29 no.2
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• pp.27-51
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• 2006

In this paper, I have tested various kinds of methods for mortality projection and chose Lee-Carter method for projection of Korean mortality by age and sex. I reviewed the trends of life tables and life expectancies by age and sex from 2005 to 2050 projected by Lee-Carter method and found that the method was very applicable for Korean mortality projection. The differences between reported and estimated data for the period of 1971-2003 were small enough for both sexes and for all of the age groups. The projected life expectancies in 2051 were 82.73 years for males and 89.41 for females, and the differences decreased from 7.06 years in 2005 to 6.68 years. Because of the limitation of Korean infant mortality rate, I adopted the Japanese estimated IMR in 2050 as Korean object level in 2051. When the time series of IMR become long enough, we can use Korean IMR directly for the mortality projection. In addition, if we can estimate the changes of the main cause of death correctly in future, the mortality projection will be more correct and reliable. This will be available when we can produce a long series of life tables by cause of deaths.

• Journal of Korea Water Resources Association
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• v.45 no.5
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• pp.481-493
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• 2012

The Uncertainty of drought events can be regarded as supernatural phenomena so that the uncertainty of water supply system will be also uncontrollable. Decision making for water supply system operation must be dealt with in consideration of hydrologic uncertainty conditions. When ultimate small quantity of precipitation or streamflow lasts, water supply system might be impacted as well as stream pollution, aqua- ecosystem degradation, reservoir dry-up and river aesthetic waste etc. In case of being incapable of supplying water owing to continuation of severe drought, it can make the damage very serious beyond our prediction. This study analyzes comprehensively sustained drought impacts on the Han River Basin Water Supply System. Drought scenarios consisted of several sustained times and return periods for 5 sub-watersheds are generated using a stochastic hydrologic time series model. The developed drought scenarios are applied to assess water supply performance at the Paldang Dam. The results show that multi-year drought events reflecting spatial hydrologic diversity need to be examined in order to recognize variation of the unexpected drought impacts.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.28 no.4
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• pp.191-201
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• 2016

A stochastic process has been used to develop a condition-based model for preventive maintenance of armor units of rubble-mound breakwaters that can make a decision the optimal interval at which some repair actions should be performed under the perfect maintenance. The proposed cost model in this paper based on renewal reward process can take account of the interest rate, also consider the unplanned maintenance cost which has been treated like a constant in the previous studies to be a time-dependent random variable. A function for the unplanned maintenance cost has been mathematically proposed so that the cumulative damage, serviceability limit and importance of structure can be taken into account, by which a age-based maintenance can be extended to a condition-based maintenance straightforwardly. The coefficients involved in the function can also be properly estimated using a method expressed in this paper. Two stochastic processes, Wiener process and gamma process have been applied to armor stones of rubble-mound breakwaters. By evaluating the expected total cost rate as a function of time for various serviceability limits, interest rates and importances of structure, the optimal period of preventive maintenance can easily determined through the minimization of the expected total cost rate. For a fixed serviceability limit, it shows that the optimal period has been delayed while the interest rate increases, so that the expected total cost rate has become lower. In addition, the gamma process tends to estimate the optimal period more conservatively than the Wiener process. Finally, it is found that the more crucial the level of importance of structure becomes, the more often preventive maintenances should be carried out.

• Korean Journal of Adult Nursing
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• v.15 no.2
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• pp.287-295
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• 2003

Purpose: This descriptive study was conducted to project the number of critical care APNs needed in critical care units in an acute care hospital setting, up to the year 2020. Method: Necessary data and information were collected from various funded reports, professional literature, web-sites and personal visits to national and private institutions. The demand of critical care APNs were projected based on two critical care APNs per critical care units. Result: The projected number of critical APNs for the critical care units in acute care hospital settings as follows: 1) The total projected number of critical care APNs needed for critical care units were 1,270 in 2001. 2) By the year 2020, total number of projected critical care APNs needed in critical care units will be 1,080-1,700. Conclusion: In order to match the supply to the need, the professional organization should direct their efforts toward enacting legislation. Educational systems should identify strategies in initiation of critical care APN programs in masters level as well as standardizing curriculums across the programs.

• Korean Journal of Occupational Health Nursing
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• v.12 no.1
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• pp.59-70
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• 2003

Purpose: The purpose of this study was to project the workforce of occupational health nurse-specialist(OHN-S) in Korea. Method: Ratio model and expert opinion were used for projecting the number of OHNS. Result: 1) In 2002, there are 1,405 occupational health nurses in Korea. This represents 0.93% of total available nurses and 3 occupational health nurses per 100,000 population. 2) The number of OHN-S needed to meet the demands in 2002, 2005 and 2020 was estimated at 3,318, 3,351 and 3,515 respectively. The projected number of OHN-S of the year 2002 was 2.20% of total available nurses in Korea and 7 OHN-S per 100,000 population. Conclusion: In order to match the supply to the need, the professional organizations should direct their effort toward enacting legislation. Education systems should identify strategies in initialing advanced practice nursing programs in master's level as well as standardizing curriculums across the programs.

• Water for future
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• v.28 no.2
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• pp.103-114
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• 1995

A stochastic model "STO-RIV" for the prediction of water quality variation in a river system has been developed. Extended Streeter-Phelps equation and Monte Carlo simulation are used in the model. The model is applied to the reach of Waegwan to Mulkeum in the Nakdong River to compute the probability distribution of BOD and DO concentration at Mulkeum site. As the strategies to attain the goal of the water quality, some alternatives considering the treatment effect of the Keumho river are discussed using the stochastic model. Application of stochastic analysis to water quality management is strongly recommended in this country.s country.

• Journal of Home Health Care Nursing
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• v.9 no.1
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• pp.37-45
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• 2002

Purpose: The purpose of this study was to suggest the projected workforce of home health care specialists in Korea. Method: Need model. ratio methods and expert opinion were used for projecting the number of home health care specialists. Result: 1) In 2002. there are 13 programs which offer one year home health specialist training. From those programs. they produced 3860 registered home health care specialists. 2) In 2002. there are 89 hospitalbased home health service units and 220 active home health care specialists. 3) In case of hospital- based home health service. average of 4 services per month for average of 3 months was assumed as workforce standard. 4) In case of community-based home health service. average of 4 services per month for 12 months was assumed as workforce standard. 5) The number of home health care specialists required to meet the demands for home health care population in 2000 and 2005 was estimated at minimum of 20.361 to maximum of 31.360 and 21.989 to 34.080. respectively. Conclusion: Community home health care agencies are needed to meet the demands of home health care.

• Korean Journal of Adult Nursing
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• v.15 no.4
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• pp.585-595
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• 2003

Purpose: The purpose of this study was to suggest the projected manpower of hospice and palliative care nurses & APNs(advanced practice nurses)needed in the future. Method: Need model, ratio model and expert opinion were used for projecting the number of hospice and palliative care nurses & APNs. Result: 1. The number of Korean hospice facilities was 64 in 2002. The number of hospice nurses in 2001 was 194 and that of beds was 407. 2. The number of hospice target patients was estimated at a minimum of 16,415 to a maximum of 25,254 in 2002, 12,366 to 26,389 in 2005, and 14,057 to 30,000 in 2020. 3. The number of hospice and palliative nurses needed to meet the demands in 2002, 2005 and 2020 was estimated at a minimum of 1,136 to maximum of 1,748, 1,187 to 1,826, and 1,349 to 2,076, respectively. 4. The number of hospice & palliative care APNs needed to meet the demands in 2002, 2005 and 2020 was estimated at 232, 242, and 274, respectively. Conclusion: The legalization of hospice is expected to increase demands for hospice nurses and advanced practice hospice and palliative care nurses in the future.

• Korean Journal of Adult Nursing
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• v.15 no.4
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• pp.542-550
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• 2003

Purpose: The purpose of this study was to suggest the projected workforce of certified emergency nurses in Korea. Method: The methods used in this study are 1) demand & ratio model was used for the projected workforce of CEN, 2) Index functional formula was used for the suggestion of the number of general hospitals and hospitals, 3) Experts in Emergency care were contacted to get an opinion and information about the criteria of distribution and scope of CEN, 4) National and international internet data were collected. Result: The demand of CEN were analyzed by two ways; demand of Emergency centers only and demand of emergency centers including community centers. The number of CENs needed to meet the demands in 2002, 2005 and 2010 was estimated at minimum of 1,512 to maximum1,576, 1,640 to 1,704 and 1,892 to 1,956 respectively. The projected number of CENs for the 2002 was 1% total available nurses in Korea, and 3.2 CENs per 100,000 population. Conclusion: It is really desirable that CENs not only work for hospital emergency centers but also for emergency related centers in community.