• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.724-730
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• 2004

본 연구에서는 GIS와 연계되는 SWAT 모형을 이용하여 소양강댐 유역의 일 유출량을 모의하였으며, 모형에서 제공하는 단일 지점을 이용하는 기본 방법과 다지점 강우를 이용하기 위한 방법으로 나누어 비교하였다. 모형의 민감도 분석을 통해 매개변수를 최적화 하였고, 잠재 증발산량을 산정하기 위하여 Penman-Monteith 방법을 이용하였다. 과거의 관측 수문곡선을 SWAT 모형에 의해 모의된 일 유출 수문곡선과 비교한 결과, 두 가지 방법 모두 총 유출체적은 물수지에 기본을 둔 모형의 특성상 잘 일치 하였다. 그러나 갈수기와 홍수기의 일 유출 수문곡선은 다지점의 강우자료를 이용한 경우가 더 적합함을 알 수 있었다. 또한 SWAT 모형이 장기 일 유출량 모의에 적용 가능함을 확인하였다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1996.04a
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• pp.162-162
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• 1996

70년대 두 차례의 유류파동은 에너지자원의 중요성에 대한 기존의 인식을 급속도로 변화시켰으며, 이와 아울러 신대체에너지를 중심으로 한 신기술의 개발여부와 관련하여 에너지 기술평가모형의 수요를 급증시켰다. 이에 지난 십여년간 구미제국을 중심으로 다양한 에너지신기술을 평가하기 위해 다양한 분석기법들이 개발되어 왔으며 이러한 평가기법들을 총괄적으로 지칭하는 에너지기술평가모형(Energy Technology Assessment Models)은 에너지신기술의 경제적, 기술적 특성과 에너지시스템내에서 신기술의 잠재적 역할을 사전 평가하면서 국가적 차원에서의 에너지연구개발 정책을 수립하는데 널리 이용되어 왔다. 본 연구는 국내 에너지 연구개발 관련자들의 이해부족과 데이터베이스의 미비 등 여러 가지 제약요인들로 에너지기술 평가모형이 널리 실용화되지 못하고 있는 현실을 감안하여 경제/에너지/환경/기술개발정책에 있어서의 에너지부문의 역할을 장기적으로 재평가하고 특히 기존 에너지문제의 제약요인인 환경문제 해결을 위한 에너지 수요관리 평가의 개발 필요성에 부응하기 위하여 기존의 거시 경제적 에너지공급모형과 최근 미국, EU등에서 발전시켜 나가고 있는 경제/에너지/환경/기술개발의 통합모형을 문헌조사를 통해 비교,분석하였다.

• Journal of Animal Science and Technology
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• v.46 no.2
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• pp.137-144
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• 2004

Algorithms for estimating breeding values on several categorical data by using latent variables with threshold conception were developed and showed. Thresholds on each categorical trait were estimated by Newton’s method via gradients and Hessian matrix. This algorithm was developed by way of expansion of bivariate analysis provided by Quaas(2001). Breeding values on latent variables of categorical traits and observations on linear traits were estimated by preconditioned conjugate gradient(PCG) method, which was known having a property of fast convergence. Example was shown by simulated data with two linear traits and a categorical trait with four categories(CE=calving ease) and a dichotomous trait(SB=Still Birth) in threshold animal mixed model(TAMM). Breeding value estimates in TAMM were compared to those in linear animal mixed model (LAMM). As results, correlation estimates of breeding values to parameters were 0.91${\sim}$0.92 on CE and 0.87${\sim}$0.89 on SB in TAMM and 0.72~0.84 on CE and 0.59~0.70 on SB in LAMM. As conclusion, PCG method for estimating breeding values on several categorical traits with linear traits were feasible in TAMM.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.1
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• pp.468-476
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• 2020

This study investigated how latent groups depend on the longitudinal trajectories observed in fathers' involvement in parenting over a five year period, and the study also determined differences in children's behavioral problems and mother's parenting stress, marital satisfaction, and depression among these groups. By utilizing 1,316 sets of data from 1st to 5th Panel Survey of PSKC beginning in 2008, we examined the patterns of the latent groups and the differences among them. The results showed that, first, a changing pattern of fathers' involvement in parenting is classified into four groups: a low-stable group, a decreasing group. a middle-high changeable group, and a highest changeable group. According to the results of the latent groups, the fathers' involvement in parenting commonly started to decrease at the children's age of 4 years old. Second, problematic behaviors of children appeared more from the fathers in the decreasing group. Third, parenting stress, marital conflict, and depression were more often found in the low-stable group that in the decreasing group. the middle-high changeable group and the highest changeable group (in that order), while marital satisfaction showed a completely opposite pattern. Based on these results, political intervention and the future direction of research for fathers' involvement in parenting are needed in order to increase better behaviors of their children as well as the psychological well-being of their mothers.

• The Journal of the Korea Contents Association
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• v.17 no.10
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• pp.179-189
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• 2017

The purpose of this paper is to develop a comprehensive research model that can explain potential customers' intentions to adopt and use VPA(Virtual Personal Assistants) devices. This study proposes and validates a new theoretical model that extends the perceived value theory. Partial least squares analysis is employed to test the research model and corresponding hypotheses on data collected from 313 survey samples. Perceived value, perceived usefulness, perceived enjoyment are important factors affecting the adoption of VPA devices. To increase potential users' intention to use, VPA device manufacturers should not only focus on developing utilitarian functions but also fun features based on open development echo-system. This study is the important empirical attempt to examine user acceptance of VPA devices, as most of the prior literature has concerned analysis of usage patterns or technical features.

• Journal of Korea Water Resources Association
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• v.30 no.4
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• pp.379-387
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• 1997

This study involves field monitoring of hydrlolgic characteristics of paddy fields under common irrigation practice, statistical analysis of maximum retention storage, determination of CNs for antecedent moisture conditions. Curve numbers were estimated from observed rainfall-runoff relationship of two years data. The estimated CN for AMC-II was 78, and the CNs for AMC-I and II were 63 and 88, respectively. A water balance model was used to find the effect of ridge height changes and initial ponding depth in paddy fields on runoff. The probability distribution of initial ponding depth was also investigated. The initial ponding depth follows normal probability distribution. Initial ponding depth corresponding 10%, 50%, and 90% probability were considered to be equivalent to AMC-I, AMC-II, and AMC-III, respectively. Long-term runoff data from paddy fields were simulated by a water balance model using recorded climate data, ridge height and estimated initial ponding depth derived from probability distribution. The estimated CNs using simulated runoff were 70, 79, and 89 for CN-I, CN-II, and CN-III, respectively.

• Spatial Information Research
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• v.9 no.2
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• pp.341-352
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• 2001

This study was carried out to developed that appraisement model of Potential Productivity Index(PPI). PPI model was used Farmland Productivity Index(FPI) and Labor Productivity Index(LPI) by GIS, and PPI model applied to farm land consolidation region which has been completed recently. FPI was determined by overlapping Poly Grid of the soil properties at the analyzed project region. LPI was estimated by addition productive wages ratio of total direct productive cost. Addition productive wages determined by GIS Network analysis GIS Network analysis of working distance between farm house to paddy and each paddy. PPI variation of each the analyzed paddy of Masu and Weoncheon region was 0.967~0.780 respectively, and could be showed relative largely PPI value. PPI will provide basic element for large scaling and gathering of farm land and a substitute lot of farm land consolidation, and will be maximize productivity of paddy.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.35 no.2
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• pp.87-97
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• 2017

Paulownia species has long been recognized in Korean traditional culture and the values of the species have been researched in various focuses. However, studies on distribution and ecological characteristics of the species are still needed. This study aimed to identify distribution trends and ecological characteristics of two Paulownia species in Busan metropolitan city using the MaxEnt model. The MaxEnt model was established based on the environmental factors such as positioning information of the Paulownia species, topography, climate and degree of anthropogenic disturbance potentiality (ADP), which was collected in the on-site research. The study verified that the accuracy of the model was appropriate as the AUC value of Paulownia coreana and P. tomentosa was 0.809, respectively. In terms of the distribution trends of the two Paulownia species in the research area depending on the distribution model, they were both mainly distributed in downtown where built-up area and bare ground were densely concentrated. The potential distribution area of the two species was identified as $137.4km^2$ for P. coreana and $135.0km^2$ for P. tomentosa. The distribution probability was high in Jung-gu, Dongrae-gu, Busanjin-gu and Yeonje-gu. As a result of the analysis on contribution of the environmental factors, it was turned out that the degree of anthropogenic disturbance potentiality (ADP) contributed to distribution of P. coreana and P. tomentosa by about 50%, and the contribution of the environmental factors had a positive correlation with the degree of ADP. The elevation had a negative correlation with both the two species, which was considered because the species must compete more with native species in natural habitats as the altitude above sea level rises. The research findings demonstrated numerically that the distribution of P.coreana and P. tomentosa depended on artificial activities, and indicated the relevance with the Korean traditional landscape. These findings are expected to provide meaningful information in using, preserving and restoring Paulownia species.

• Journal of the Korea Fashion and Costume Design Association
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• v.15 no.1
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• pp.1-19
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• 2013

본 논문은 모바일 패션 쇼핑의 소비자 행동을 설명하기 위해 모바일 패션소비자의 유행선도력(유행선도성향, 의견선도성향, 선도잠재성향)과 모바일 상거래 특성(모바일 편재성, 모바일 개인화, 모바일 위치성)을 패션 수용상황에 적합한 기술수용 관점에서 관련성을 제시하여 시사점을 도출하고자 한다. 본 조사는 모바일 인터넷 서비스 및 커머스를 1회 이상 이용해 본 경험이 있는 패션 소비자 406명을 자료 분석에 사용하였으며, 분석 결과는 다음과 같다. 첫째, 패션소비자의 유행선도력의 유행선도성향과 선도잠재성향은 지각된 가치에 유의한 영향을 미치는 것으로 나타났다. 둘째, 패션소비자의 모바일 상거래 특성의 편재성은 지각된 가치와 지각된 유용성에 유의한 영향을 미치는 것으로 나타났다. 셋째, 모바일 패션커머스에 대한 지각된 가치는 지각된 유용성과 수용태도에 유의한 영향을 미치는 것으로 나타났다. 넷째, 모바일 패션커머스에 대한 지각된 유용성은 수용태도에 유의한 영향을 미치는 것으로 나타났다. 다섯째, 모바일 패션커머스에 대한 지각된 신뢰는 지각된 유용성과 수용태도에 유의한 영향을 미치는 것으로 나타났다. 이 결과로 패션 소비자의 유행선도력과 모바일 상거래 특성이 패션 모바일 커머스를 확산하는 능력을 지녔음을 제시한다. 또한 기존 연구에서의 패션상품 구매의도 형성요인들과 통합할 경우, 보다 설명력 있는 확장된 혁신수용 모델이 개발될 것으로 예상된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.05a
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• pp.193-194
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• 2018

최근 정부의 RPS(신재생에너지 의무할당제, Renewable Energy Portplio Standard) 확대 시행과 신재생 3020 정책에 맞물려 정부뿐만 아니라 기업체의 신재생에너지 발전설비용량과 발전량의 확대가 요구되는 시점이다. 특히 조류에너지는 환경친화적이며 지속가능한 에너지원으로서 그 관심이 더욱 커지고 있다. 그러나 조류발전 후보지는 유속이 매우 빠르고, 설치가 어려워 그에 따른 제반사항들이 다른 에너지원에 비해 상대적으로 많다는 단점이 있어, 조류발전단지 구축 시에는 후보지를 선정하고 타당성 조사를 수행하는 과정이 매우 중요하다. 따라서 본 논문에서는 최대의 조류에너지를 얻을 수 있는 해역을 선정하여 조류발전단지를 설계하고 후류의 특성을 분석하였다. 먼저 전자해도의 상세 수심 자료를 추출해 상용 프로그램인 ADCIRC 프로그램에 실제 지형을 수치 모형화하였고, 잠재적 에너지 분포가 높은 해역에 1MW급 수평축 조류발전 터빈을 설계하여 적용하였다. 또한 조류발전단지 내의 터빈의 배치 방법(Centered, Staggered Layout)에 따른 후류의 특성을 분석하여 연간 전력 생산량을 계산하였다.