• Journal of the Economic Geographical Society of Korea
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• v.13 no.1
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• pp.147-158
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• 2010

Knowledge spillover among firms is a crucial ingredient in realizing the benefits of agglomeration. This paper provides an overview and critical assessment of the Shihwa Industrial Complex (SIC) in Korea. In order to identify the relationships and interplay among different agents in the area, a survey was conducted on business networking of industry-academia-government collaboration in research and development. Unlike the closely knit input-output relationship, the findings suggest that the technological linkages in the SIC still have room for improvement. As the role of small and medium enterprises as catalysts of regional economic development in Korea is expected to grow in importance, more effort should be made to nurture clustering and R&D networking among them.

• Journal of the Korean Society for Marine Environment & Energy
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• v.20 no.2
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• pp.76-83
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• 2017

In order to investigate the characteristics of water quality and heavy metals in Shihwa Lake, concentration comparisons according to land use types and mass discharge through streams were carried out. Based on classification for streams according to land use types, the concentration of DO, SS, POC, $NO_3$ and Chl-a showed higher concentrations in agricultural areas than in industrial and urban areas. However, COD, DIN, DIP, TN, TP, DOC, TOC and heavy metal concentrations showed relatively high values in industrial areas. The concentrations of water qualities and heavy metals were relatively high in March to May and the concentration decreased in summer seasons (July-August). The averages of stream discharges of water qualities were 1,172 kg/d for SS, 151 kg/d for TN, 11.1 kg/d for TP and 389 kg/d for TOC, respectively. The agricultural area, Jangjunbo(S8), accounted for 47.5%(TP)~75.1%(SS) in the total stream discharges. Cu, Zn and Cd in stream waters were found to be more than 92% of the total discharges in industrial area, showing descending order of Zn>Cu>Ni>Pb>Co>Cd.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.1026-1030
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• 2005

조력발전 건설사업에서 우선적으로 고려되어야 할 사항은 조수간만에 의해 외해부와 조지부 사이를 이동하는 해수를 적절히 소통시키는 것이다. 예를 들어, 단조지 단류식 발전으로 창조시에 발전을 행할 경우, 발전을 행하면서 높아진 조지내의 수위를 다음 발전을 위해서 낮아진 외해수위를 이용하여 효과적으로 배수시키지 못하면 그 시설은 발전효율이 낮아지게 된다. 즉, 수문구조물의 목적은 주어진 조건 하에서 계획된 유량을 충분히 그리고 안전하게 배제시키는 것이다. 본 연구에서는 수문구조물에 대한 물받이의 길이와 경사의 변화에 의한 외해 조위와 시화호 수위차 조건에 따른 유량계수를 구해 배수능력을 검토하고자 하였다. 이를 위해 시화호를 실험대상으로 하여 수리모형을 1:25의 축척비로 제작하였다. 시화방조제를 기준으로 외해부의 조위와 조지부의 수위차를 8가지의 실험조건으로 한 연구를 수행하였다. 유량계수를 산정하기 위하여 8개 실험조건을 계획에서 제시된 수위-조위 조건에서 수위차 및 통수유량을 분배하여 결정하였고, 유량계수 산정식에 따라 상류 흐름 안정지점에서 유속-면적법에 의해서 유량을 측정하였다. 유속은 8개 지점에 대해서 측정하였고, 각 측정지점에서의 측선은 $3\~5$개이며, 측점은 $3\~4$점법으로 수행하였다. 시화호와 외해의 수위차가 1.011m일 때의 수문을 통과하는 유량을 비교한 결과 실험 II와 III의 통과유량은 각각 $1,571m^3/s$ 및 $1,515m^3/s$ 의서 실험 I 의 $587m^3/s$에 비해 통수능이 많이 개선되었음을 알 수 있다. 그림 1은 수위차별 유량곡선을 나타내는 것으로, 실험 II에서의 수문의 통수능이 실험 I의 통수능보다 크게 나타남을 알 수 있었다.>일 때가 밸브를 $60\%$와 $80\%$ 개폐시켰을 때보다 $0.3kg/cm^2,\;0.29kg/cm^2$ 낮게 나타나 밸브를 전체 개방 했을 때 관로내의 수압이 상수설계기준에 적합한 수압을 유지함을 알 수 있다. 상수관로 설계 기준에서는 관로내 수압을 $1.5\~4.0kg/cm^2$으로 나타내고 있는데 $6kg/cm^2$보다 과수압을 나타내는 경우가 $100\%$로 밸브를 개방하였을 때보다 $60\%,\;80\%$ 개방하였을 때가 더 빈번히 발생하고 있으므로 대상지역의 밸브 개폐는 $100\%$ 개방하는 것이 선계기준에 적합한 것으로 나타났다. 밸브 개폐에 따른 수압 변화를 모의한 결과 밸브 개폐도를 적절히 유지하여 필요수량의 확보 및 누수방지대책에 활용할 수 있을 것으로 판단된다.8R(mm)(r^2=0.84)$로 지수적으로 증가하는 경향을 나타내었다. 유거수량은 토성별로 양토를 1.0으로 기준할 때 사양토가 0.86으로 가장 작았고, 식양토 1.09, 식토 1.15로 평가되어 침투수에 비해 토성별 차이가 크게 나타났다. 이는 토성이 세립질일 수록 유거수의 저항이 작기 때문으로 생각된다. 경사에 따라서는 경사도가 증가할수록 증가하였으며 $10\% 경사일 때를 기준으로 $Ro(mm)=Ro_{10}{\times}0.797{\times}e^{-0.021s(\%)}$로 나타났다.천성 승모판 폐쇄 부전등을 초래하는 심각한 선천성 심질환이다. 그러나 진단 즉시 직접 좌관상동맥-대동맥 이식술로 수술적 교정을 해줌으로써 좋은 성적을 기대할 수 있음을 보여주었다.특히 교사들이 중요하게 인식하는 해방적

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.12
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• pp.333-338
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• 2016

The purpose of this study was to understand the pollution level of the surface sediment of Sihwa Lake by assessing its geochemical characteristics and investigating the spatial distribution of trace metals and organic matter. In the surface sediment of Sihwa lake, the mean grain size was between 2.94 and 6.35 Ø and the main type of sediment was sandy silt. The concentrations of As, Co, Cr, Ni, V and Li among the metal elements in the surface sediment were correlated with the mean crust concentration (p<0.05). Based on the strong correlation between the metals (Cd, Cu, Pb and Zn) and organic matter (Ignition Loss), the concentrations of these metal elements seem to be controlled by the organic matter dilution effect. The trace metal pollution level, determined by applying the Republic of Korea Marine environmental standard and the US National Oceanic and Atmospheric Administration's sediment quality guidelines, showed the pollution level of As to be either close to or in excess of the above-mentioned standards at almost all levels. The enrichment factor and geoaccumulation index of As showed that there was an incremental increase of pollution by elements other than V, Cr, Co, Fe, Al and Mn. Moreover, the nearby industrial area and dike were more polluted than the other areas, so the surface sediments in Sihwa lake should be monitored by taking into consideration the geological variations.

• Journal of the Korean earth science society
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• v.22 no.3
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• pp.195-207
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• 2001

The variations of D.O and pH due to the inflow of seawater by sluice gates operation were observed in the Lake Shihwa, Korea. The distributions of D.O and pH were investigated at 11 stations during Feburary 1997 to July 1998. The concentration of D.O before gate operation was 10 mg/l or more all over the watershed, yet 5 mg/l or less in the water layers of 11 m or below from March to June 1997. Anoxic layer appeared in June 1997 and expanded during rainy season. The anoxic layer in the lake depleted the oxygen in seawater as seawater was inflowed. It may be interpreted that the phenomenon comes from the contact of seawater to lower fresh water. The contact of seawater in pH 7.8 to 8.2 to lower water less than pH 7.4 enhanced to oxidize. After January 1998, D.O of the lake increased over 10 mg/l and the stratification was weakened. As a result, it may be concluded that the best way to improve the water qualities is to increase the amount of seawater inflow and outflow so as not to be generated pycnocline in summer.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.29 no.5
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• pp.247-259
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• 2017

Numerical model with LPT (Lagrangian Particle Tracking) module was used to understand the variation of residence time in the outer sea of the Sihwa lake result operating from the Sihwa tidal power plant. Numerical model was composed in order to investigate the spatial distribution characteristics, the average residence time in each area was calculated by dividing the outer sea area of Sihwa lake into 4 areas. The average residence time of the areas appeared to be increase as it entered the areas located in the inner bay (13 days) from the area located in most outer sea (3 days) both before and during operation. Variation of average residence time by areas were increased in the area that was located in the most outer sea of during operation compared to before operation, and decreased in the other area. Artificial discharges from tidal power plant induces particle traps in the formation of vortex in the area located in the most outer seas, entrainment in the remaining areas, which affects variation in residence time. In other words, the jet flow generated during drainage and the change in the residence time due to the vortex and entrainment action indicate the increase horizontal mixing of water in the outer sea and in the inner bay.

• (The)Study of the Eastern Classic
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• no.56
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• pp.9-33
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• 2014

This paper aims to look into text of Toegye Lee Hwang's poem Cheongryangsan (Mt. Cheongryang). For that, the poetic aspects of experiences in staying in mountains presented in the poem were classified into materialistic aspect, a method of subject proposal, subject recognition and orientation to examine such aspects, and their respective meanings and limits were considered. First, from the materialistic aspect, the poem about Mt. Cheongryang can be divided into a case of materializing acts in Mt. Cheongryang and a case of materializing an individual scenery of Mt. Cheongryang itself. Second, from an aspect of methods of subject proposal, the poem can be divided into a case in which the space of Mt. Cheongryang is proposed syntagmatically and abstractly and a case in which each scenery is proposed by it being divided partially. Third, from an aspect of subject recognition and orientation, in case Mt. Cheongryang is realized as a solitary space separated far from the world, poetic self aims at reflection. However, in case Mt. Cheongryang is realized as a space for staying with friends and disciples, poetic self aims at communication. The above-mentioned difference is caused by the fact that Toegye had such an experience in Mt. Cheongryang twice at the interval of 10 years. This study is significant in that it intensively looked into Toegye' experience in Mountains and the poetic text which have not been studied and that Toegye's recognition and orientation of a space were discriminatively revealed.

• Journal of the Korean Society for Marine Environment & Energy
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• v.14 no.1
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• pp.40-50
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• 2011

We study the characteristic and total flux of non-point pollutants such as total suspended solids (TSS), chemical oxygen demand (COD), dissolved nutrients, total phosphorus (TP) and total nitrogen (TN) in the storm water runoff from urban streams and sewer outlets of Banweol Industrial Complex around Shihwa Lake. The concentrations of non-point pollutants were generally increased with increasing of the duration and intensity of rainfall. Mean TSS concentration of Ansan stream was higher than that of sewer outlets but mean concentrations of COD, TP and TN were approximately 2~5 times higher of sewer outlet than of urban stream. TSS showed statistically positive relationships with COD and TP but it had negative correlation with dissolved nutrients. There was a significant correlation between total flux of non-point pollutants in the storm water runoff and total basin area of each sewer outlet, showing that the highest runoff flux was observed at 3rd sewer outlet which represents the largest basin area from Banweol industrial complex. Total runoff fluxes for TSS, COD, TP and TN in this study were 187,536 kg, 17,118 kg, 922 kg, 13,519 kg, respectively. Given the basin area of sewer outlet in Banweol industrial complex which corresponds only 3% from total catchment area around Shihwa Lake, enormous amount of non-point pollutants will be entered into Shihwa Lake without any treatment. It is necessary to manage and reduce of various non-point sources and pollutants because the runoff of nonpoint pollutants during storm events should be deteriorating the water quality of Shihwa Lake. Our results provides useful informations on the development of best managements practices (BMPs) for effective implementation of total pollution loads management system of Shihwa Lake.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1994.04a
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• pp.29-42
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• 1994

• Corrugated packaging logistics
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• no.52 s.10
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• pp.76-77
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• 2003