• 지역연구
• /
• 제40권3호
• /
• pp.95-108
• /
• 2024

본 연구는 2016년부터 2019년까지의 전국사업체조사자료를 활용해 신설 및 이동 제조업체의 입지 결정요인을 분석하였다. 제조업체의 신설과 이동 제조업체의 유입 둘 다 수도권과 충청권, 영남권과 대경권에서 활발하며, 이동 제조업체의 유입은 제조업체 신설에 비해 더 적은 수의 지역에 집중된다. 음이항 회귀모형으로 입지 결정요인을 분석한 결과, 제조업 집중도와 인구밀도, 산업구조 다양성, 그리고 낮은 임금수준은 제조업체의 신설과 이동 제조업체의 유입을 함께 촉진하는 것으로 나타났다. 고학력 취업자 비율과 생산자 서비스업 접근성, 평균 지가 수준은 제조업체의 신설 빈도에만 긍정적 영향을 미쳤으며, 인적자본 및 생산자 서비스업에 대한 의존도가 높은 생애주기 단계 초기의 기업이 토지이용에 대해 높은 지불의사가격을 보이는 것으로 해석된다. 반면 서울과의 이동소요시간 및 교통접근성의 증가는 이동 제조업체의 유입 확률을 높인다. 이는 재입지 선택 시 서울 근접성이 주는 편익보다 서울로부터의 이격에 따른 비용 절감 유인이 중요할 수 있으며, 집적경제 강화와 더불어 교통 인프라의 효율성을 개선함으로써 이동 제조업체의 비수도권 유치 가능성을 높일 수 있음을 시사한다.

• 생태와환경
• /
• 제41권4호
• /
• pp.512-518
• /
• 2008

This study were to evaluate trophic conditions, N : P ratios, and empirical relations of chlorophyll (CHL) systematically using TN, TP, and CHL values in agricultural reservoirs and drinking water supplying dams. During the study, nutrients and CHL varied depending on seasonal conditions and types of the reservoirs, but most reservoirs were diagnozed as eutrophic to hypertrophic. Mass ratios of TN : TP averaged 93.1 (range: $0.68{\sim}1342$) and about 96.6 % of the total observations (n=516) was > 17 in the N : P ratios. This result suggests that P was a potential factor limiting algal growth in the entire reservoir. Thus, TN : TP ratios were a function of phosphorus rather than nitrogen. Regression analysis of log-transformed N : P ratios against TP in DWDRs and ARs showed that ratios were linearly declined with an increase of TP ($R^2$>0.66; p<0.001). Seasonal mean CHL was minimum ($4.3{\mu}g\;L^{-1}$, range: $0.1{\sim}39.7{\mu}g\;L^{-1}$) in premonsoon, and was similar between the monsoon and postmonsoon. In contrast, one of the tremendous features was that values of CHL was greater in the ARs than DWDRs. Thus, the spatial and temporal patterns in CHL were similar to those of TP but not TN. Empirical models of CHL-TP showed that CHL variation could explain average 15.3% and 11.3% in DWDRs and ARs, respectively. Seasonal analysis of empirical models showed that CHL-TP relations were stronger in postmonsoon than those of premonsoon and monsoon.

• Journal of Ecology and Environment
• /
• 제38권4호
• /
• pp.505-515
• /
• 2015

The objectives of this study were to determine the effects of stream nutrient regime, N:P ratios and suspended solids on fish tolerance/trophic compositions and stream ecosystem health, based on multi-metric model, during 2008-2013. Also, stream ecosystem health was evaluated in relation to chlorophyll-a (CHL) as a measure of algal productivity or indicators of trophic state to water chemical parameters. Total number of sampled fish species were 50 and showed a decreasing trend from 2008 to 2013. The minnow of Zacco platypus, based on the catch per unit effort (CPUE), was the most dominant species (25.9%) among the all species. Spatial heterogeneity was evident in the fish tolerance guilds that showed the dominance of sensitive species (89%) in the headwaters (S1) and the dominance of tolerant species (57%) in the urban. These conditions were directly influenced by concentrations of nutrients and organic matter (COD). The N:P ratios, as a barometer of water pollution, had a negative linear function (R² = 0.40, P < 0.01) with CHL, and the ratios had an important role in changes of COD concentration (R² = 0.40, P < 0.01). Under the circumstances, the N:P ratio directly influenced the relative proportions of fish trophic/tolerance compositions. According to the regression analysis of omnivore (O_m) and insectivore sp. (I_n) on total nitrogen and total phosphorus, nitrogen had no significant influences (P > 0.05) to the two compositions, but phosphorus influenced directly the two guilds [slope (a) = -32.3, R² = 0.25, P < 0.01 in the I_n; a = 40.7, R² = 0.19, P < 0.01 in the O_m]. Such water chemistry and fish trophic guilds determined the stream ecosystem health, based on the multi-metric fish model.

• Asian-Australasian Journal of Animal Sciences
• /
• 제13권6호
• /
• pp.845-855
• /
• 2000

As high as 50% of pregnancies are known to fail and the majority of such losses occur during the peri-implantation period. For the establishment of pregnancy in mammalian species, therefore, implantation of the conceptus to the maternal endometrium must be completed successfully. Physiological events associated with implantation differ among mammals. In ruminant ungulates, an elongation of the trophohlast in early conceptus development is required before the attachment of the conceptus to the uterine endometrium. Moreover, implantation sites are restricted to each uterine caruncula where tissue remodeling, feto-maternal cell fusion and placentation take place in a coordinated manner. These unique events occur under strict conditions and are regulated by numerous factors from the uterine endometrium and trophoblast in a spatial manner. Interferon-tau (IFN-${\tau}$), a conceptus-derived anti-Iuteolytic factor, which rescues corpus luteum from its regression in ruminants, is particularly apt to play an important role as a local regulator in coordination with other factors, such as TGF-${\beta}$, Cox-2 and MMPs at the attachment and placentation sites.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
• /
• 제28권2호
• /
• pp.141-148
• /
• 2017

Objectives: The current study examined the effect of birth weight on the relationship between age and IQ of children, who were born preterm with very low birth weight (VLBW) or extremely low birth weight (ELBW). Methods: The study subjects were 82 children, aged between 3-5 years, who visited the neonatal intensive care unit of a university hospital located in Seoul. The children had been born prematurely with VLBW or ELBW. Their IQ was tested using the performed Korean-Wechsler Preschool and Primary Scale of Intelligence fourth edition. Results: A hierarchical regression analysis showed a significant interaction effect of birth weight and age on Full Scale IQ (FSIQ); the effect of age on FSIQ differed according to birth weight. For the group with VLBW, FSIQ was more likely to be higher with increasing age. Conversely, for the group with ELBW, FSIQ remained low regardless of the age level. In addition, birth weight and age had a significant interaction effect on the Visual Spatial Index. Birth weight had a significant main effect on Verbal Comprehension Index. Conclusion: This research suggested the possibility of predicting the cognitive developmental of premature children, by highlighting the fact that prematurely born children, with VLBW/ELBW, have different cognitive developmental trajectories.

• 지적과 국토정보
• /
• 제44권1호
• /
• pp.195-212
• /
• 2014

본 연구는 부동산 분양 및 개발 사업의 성패에 큰 영향을 미치는 부동산 마케팅 전략의 영향요인을 구축하고, 유형별 만족도의 영향요인을 PLS 회귀분석을 통해 도출하고자 한다. 자료 구축은 부동산 분양 및 개발 사업을 전문으로 하는 집단을 대상으로 실시하였으며, 부동산 유형 분류는 사업적 분류방식에 의해 주거용(residential)과 비주거용(nonresidential)으로 구분한다. 분석결과 주거유형의 경우 브랜드 신뢰, 제휴 및 협력관계 강화, 교통환경, 분양 조건 완화, 사업설명회, 미분양 특전, 납부 조건 완화 요인이 중요하게 도출되었으며, 비주거유형의 경우 납부 조건 완화, 고객지향성, 생활환경, 제휴 및 협력관계 강화, 커뮤니케이션 요인이 만족도에 영향을 주는 것으로 도출되었다.

• 대한교통학회지
• /
• 제33권3호
• /
• pp.268-275
• /
• 2015

우리사회가 초고령 사회로 빠르게 진입하면서 고령자를 고려한 교통정책에 대한 관심이 증가하고 있다. 그동안 고령자 통행에 관한 상당한 연구가 수행되었으나, 고령자 통행의 시공간적 특성을 체계적으로 분석한 연구는 많지 않았다. 이에 본 연구는 대중교통 통행유입 모형을 바탕으로, 고령자 통행의 시간적 특성은 시간대별 모형으로, 공간적 특성은 도시기반시설 자료를 독립변수에 포함하여 설명하고자 하였다. 분석결과, 고령자 통행에 주로 영향을 미치는 도시기반시설은 대중교통시설과 상업면적, 병원수로 나타났으며, 특히 09시-17시 사이에 영향이 큰 것으로 파악되었다.

• 한국농업기계학회:학술대회논문집
• /
• 한국농업기계학회 2017년도 춘계공동학술대회
• /
• pp.45-45
• /
• 2017

On-site monitoring of vegetable growth parameters, such as leaf length, leaf area, and fresh weight, in an agricultural field can provide useful information for farmers to establish farm management strategies suitable for optimum production of vegetables. Unmanned Aerial Vehicles (UAVs) are currently gaining a growing interest for agricultural applications. This study reports on validation testing of previously developed vegetable growth estimation models based on UAV-based RGB images for white radish and Chinese cabbage. Specific objective was to investigate the potential of the UAV-based RGB camera system for effectively quantifying temporal and spatial variability in the growth status of white radish and Chinese cabbage in a field. RGB images were acquired based on an automated flight mission with a multi-rotor UAV equipped with a low-cost RGB camera while automatically tracking on a predefined path. The acquired images were initially geo-located based on the log data of flight information saved into the UAV, and then mosaicked using a commerical image processing software. Otsu threshold-based crop coverage and DSM-based crop height were used as two predictor variables of the previously developed multiple linear regression models to estimate growth parameters of vegetables. The predictive capabilities of the UAV sensing system for estimating the growth parameters of the two vegetables were evaluated quantitatively by comparing to ground truth data. There were highly linear relationships between the actual and estimated leaf lengths, widths, and fresh weights, showing coefficients of determination up to 0.7. However, there were differences in slope between the ground truth and estimated values lower than 0.5, thereby requiring the use of a site-specific normalization method.

• 한국경제지리학회지
• /
• 제14권3호
• /
• pp.437-451
• /
• 2011

본 연구에서는 서울의 인구집중 해소와 함께 자족기능을 갖춘 도시의 개발을 목적으로 수도권 1기 신도시 건설계획이 수립된 이후 20여년이 경과한 시점에서 그간 서울시 거주자의 통근통행패턴에 어떤 변화가 있었는지 살펴보았다. 우선 통근시간에 영향을 주는 요인을 판별하기 위해 가구통행실태조사 자료를 이용하여 다중회귀분석을 실시한 후, 초과통근 실태를 분석하여 서울시의 직주 불일치 정도를 알아보았다. 분석결과에 따르면, 통근자들은 소득이 높아질수록 통근시간이 늘어나다가 일정 수준에 다다르면 통근시간이 줄어드는 양상을 보였다. 또한 서울시의 통근비용이 최소화되는 경우에 비해 상당한 수준의 초과통근이 이루어지고 있는 것으로 나타났다. 전체적으로 서울의 직주 불일치가 과거에 비해 완화된 것으로 나타나나, 행정구별로는 여전히 직주 불일치도의 격차가 심하였다. 수도권 신도시 건설 이후 서울 거주자들의 통근패턴 변화와 현재의 직주불일치 정도를 파악한 본 연구 결과를 통해 비효율적 통근 문제의 해결책을 모색하고, 지속가능한 도시개발을 가능케 하는 정책이 수립될 수 있을 것이다.

• Journal of Ecology and Environment
• /
• 제40권1호
• /
• pp.34-44
• /
• 2016

Background: Little is known about how chemical water quality is associated with ecological stream health in relation to landuse patterns in a watershed. We evaluated spatial characteristics of water quality characteristics and the ecological health of Dongjin-River basin, Korea in relation to regional landuse pattern. The ecological health was assessed by the multi-metric model of Index of Biological Integrity (IBI), and the water chemistry data were compared with values obtained from the health model. Results: Nutrient and organic matter pollution in Dongjin-River basin, Korea was influenced by land use pattern and the major point sources, so nutrients of TN and TP increased abruptly in Site 4 (Jeongeup Stream), which is directly influenced by wastewater treatment plants along with values of electric conductivity (EC), bacterial number, and sestonic chlorophyll-a. Similar results are shown in the downstream (S7) of Dongjin River. The degradation of chemical water quality in the downstream resulted in greater impairment of the ecological health, and these were also closely associated with the landuse pattern. Forest region had low nutrients (N, P), organic matter, and ionic content (as the EC), whereas urban and agricultural regions had opposite in the parameters. Linear regression analysis of the landuse (arable land; $A_L$) on chemicals indicated that values of $A_L$ had positive linear relations with TP ($R^2=0.643$, p < 0.01), TN ($R^2=0.502$, p < 0.05), BOD ($R^2=0.739$, p < 0.01), and suspended solids (SS; ($R^2=0.866$, p < 0.01), and a negative relation with TDN:TDP ratios ($R^2=0.719$, p < 0.01). Conclusions: Chemical factors were closely associated with land use pattern in the watershed, and these factors influenced the ecological health, based on the multimetric fish IBI model. Overall, the impairments of water chemistry and the ecological health in Dongjin-River basin were mainly attributes to point-sources and land-use patterns.