• Journal of Environmental Impact Assessment
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• v.32 no.3
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• pp.176-186
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• 2023

Urban Heat Island (UHI) is caused by an energy imbalance in urban areas, where building design and land cover contribute to its amplification. To mitigate UHI, increasing green space is one of the well known and the most effective approach. This study aims aimed to identify specific components of green spaces that lower temperatures and demonstrate the cooling effects based on their size and composition. Forests within green spaces have had a greater impact on temperature reduction due to shading and blocking solar radiation. Although lakes also contributed to temperature reduction, the effect to cooling intensity was not significant. The cooling distance does not depended on green space size or composition. The study emphasizes that initial temperature has a strongerinfluence on cooling intensity than green space size, highlighting the importance of vegetation type within green spaces to achieve a cooling effect. These findings provide valuable insights for urban planning and the design of green spaces to mitigate the effects of the urban heat island.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.5
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• pp.492-500
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• 2015

This paper attempts to analyze the public's attitudes about the Saemangeum development project and its impact on marine environment with the data from a national survey of 1,000 households obtained by a professional survey firm with face-to-face interviews using two split samples: a sample of 400 households in on-site area (Saemangeum area) and a sample of 600 households in off-site area (the nation except for Saemanguem area). More specifically, ordered probit model is employed to investigating the factors affecting the public attitudes to the Saemanguem development project. The results show that over 70 percentage of respondents in both the samples opposed Saemanguem development project when they considered its economic gain and impacts on marine environment at the same time. Futhermore, over 90 percentage of respondents judged that environmental management of Saemanguem open sea is necessary. Therefore, making appropriate actions are required to manage marine environment of Saemanguem open sea.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.32-32
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• 2016

정부는 1999년 제정된 연안관리법에 따라 2000년부터 시행 중인 '연안정비계획' 등을 통하여 연안 침식 대응사업을 지원하고 있다. 그러나 연안의 개발은 지속적으로 일어나고 있으며 그 중 동해항 3단계 북방파제 축조공사가 내년 3월 중으로 착공할 것으로 예상된다. 동해항 3단계 개발사업은 동해항을 환동해권 물류 중심 거점 항만으로 육성하기 위해, 오는 2020년까지 대규모 항만개발과 방파제 등이 축조될 예정이다. 이에 따라 본 연구에서는 동해항 3단계 개발사업의 추진에 따른 인근해변의 해안침식 저감대책 방안으로 해안선 및 수심 변화를 예측하고자 한다. 동해항 인근의 추암 해수욕장부터 삼척 해수욕장까지 대상지역 N-line 모델 적용 및 Case분석을 실시한다. 해안선 변화는 Polar coordinate에서 개발된 One-line 모델에 회절 효과를 반영하고 해빈 경사와 쇄파고에 따라 횡단 방향으로 발생하는 표사로 인한 추가적인 해안선 변화 효과를 반영하여 입사파고 변동에 따른 단기적인 해안선 변화의 변동 폭을 제공한다. 연평균 입사 파고에 따라 형성되는 연안방향 표사로부터 해안선이 변동하며 이 해안선을 기준으로 연평균 파고에 따른 전진 폭과 최고 파고에 따른 침식 폭을 제시한다. 동해항 개발 전 변화 예측 모델링과 동해항 개발 후 변화 예측 모델링을 통해 개발에 따른 장래 해안선의 변화 예측 모델링 결과 분석 및 검토를 실시, 동해항 인근 지역에 적합한 해안선 유지관리 방법 결정 및 제안을 하는데 도움을 줄 것이라 기대된다.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.4
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• pp.661-668
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• 2023

A large amount of fuel is required for heating the agricultural facility house, and many farmhouses are experiencing the burden of heating costs due to the recent increase in fuel prices. This paper proposes a supply system that supports heating of agricultural facility houses located nearby by utilizing industrial chimney waste heat, and analyzes the application and effect of a heating cost reduction model. The system was designed based on the chimney waste heat system, and the facility house heating cost reduction model was applied and effect analysis was performed based on the proposed model. It was confirmed that the high-temperature waste heat from the chimney can be used to supply heating to facility houses in nearby farms. If heating is supplied to large-scale facility houses near industrial complexes, it is expected to contribute to improve productivity and competitiveness of domestic farms.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1483-1484
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• 2011

상용 뮤-메탈, 방향성 및 무방향성 규소강판을 출발 재료로 하여 두께 0.1 mm의 차폐재 3 종류를 제조하여 전력 케이블 인근자계 차폐 효과를 조사하였다. 3상 전류일 때, 차폐재 위치의 자기장이 100 ${\mu}T$ 정도이면 뮤-메탈이(SF < 0.1) 가장 효과적이었고, 500 ${\mu}T$ 이상이면 규소강판이(SF 0.3~0.4) 더 효과적이었다. 또한, 안쪽에 방향성 규소강판, 바깥쪽에 뮤-메탈을 함께 둘러쌀 경우 500 ${\mu}T$까지도 SF를 0.1 이하로 할 수 있었다. 한편, 단상 전류에서는 고투자율 소재의 적용은 오히려 자기장을 증가시키는 결과를 보였다. 이상의 결과는 자기장 강도 H의 크기에 따라 각 소재의 투자율 우열이 서로 다른 점과 이로 인해 차폐재 내에 유도되는 자기장 벡터와 원래의 자기장 벡터의 상호 상쇄 및 중첩 작용으로 설명할 수 있었다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.14 no.4
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• pp.247-256
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• 2002

Most of fishing ports on the east coast of Korea have constructed around sand beach. Such fishing port structure had caused important effect in erosion of neighborhood sand beach. In order to solve the problems, we have to understand the mechanism through estimations and accurate reproduction beach erosion. Simulataneously, we have to devise a suitable countermeasure for beach erosion to the object coast. This study suggests economically substantial countermeasure for beach erosion around the fishing port and investigates, the preventive effects using a numerical simulation technique.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.7 no.4
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• pp.321-328
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• 1995

The FIT(fully implicit tidal) model which adopts PCGCS (preconditioned conjugate gradient squared) method is developed and is applied to near Mokpo Harbor. Comparing computational results with observed velocities and elevations for the M$_2$ tidal constituent, agreeable correspondence is detected. The validity of the model is also proven by applying it to such areas which have narrow width (therefore showing rapid velocity), irregular topography and complex geometry. Tidal amplification phenomenon according to the constructions of seadike and sea-walls is considered by analyzing the 'filter effect' of Mokpo-ku using the model.

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1618-1619
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• 2003

개방형 스페이서(barrier)가 적용된 가스 절연개폐장치(GIS)에 외장형 부분방전(PD) 센서를 적용 하고 센서장착부, 인근 스페이서 또는 부싱으로 유입되는 광대역 잡음신호의 투과율을 10 - 2000 MHz의 극초단파 영역에서 측정하였다. 또한 간단한 금속 차폐체에 의한 잡음신호의 감쇄효과도 측정 하였다. 스페이서 또는 부싱을 통하여 인근센서에 유입되는 잡음의 크기는 차폐시와 대비하여 약 25 dB 증가하였다.

• Korean Journal of Ecology and Environment
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• v.45 no.4
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• pp.392-402
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• 2012

In this study, to analyze the stream health using fish assemblage and make effective management, we conducted fish monitoring in the Hoeya River basin and neighboring streams. A total of 33 species classified into 12 families were collected from 29 sites in 2007. Dominant species was Zacco platypus (Relative abundance, RA: 24.8%), and subdominant species was Rhynchocypris oxycephalus (RA: 16.2%). Eight Korean endemic species and 4 exotic species were identified. Moreover, two species (Opsariichthys uncirostris amurensis and Hemiculter eigenmanni) were translocated from other basin. To evaluate stream health of the study sites, Index of Biological Integrity (IBI) was applied, based on fish assemblages. Overall, IBI values were "C (Fair)" or "D (Poor)" condition, according to the grade except two sites which recorded "B (Good)". The correlation between land use pattern of surrounding watershed and IBI was analyzed to verify impact of development on stream health using fish assemblage. As a result, when percentage of the developmental groups increased, IBI values were decreased (Pearson correlation, r=-0.425, p=0.022). In contrast, increment of percent forest and grass land was positively correlated with IBI (r=0.556, p=0.002). The agricultural group and IBI did not significantly correlate with each other (r=-0.231, p=0.333). In this study, we identified a relationship between land use of surrounding watershed and stream health using fish data (i.e. IBI). These results could be provided useful fundamental information to establish management and restoration plan in the Hoeya River basin and other rivers distributed in Korea.

• Journal of Korean Society of Transportation
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• v.25 no.2 s.95
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• pp.17-26
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• 2007

Because the prime objective of the current preemption methods at signalized intersections near highway-railroad grade crossings(IHRGCs) is to clear the crossing, secondary objectives such as safe pedestrian crossing time and minimized delay often are given less consideration or are ignored completely during the preemption. Under certain circumstances state-of-the-practice traffic signal preemption strategies may cause serious pedestrian safety and efficiency problems at IHRGCs. An improved transition preemption strategy(ITPS) that is specifically designed to improve intersection performance while maintaining or improving the current level of safety was developed by Cho and Rilett. Even if the new transition preemption strategy improved both the safety and efficiency of IHRGCs, the performance of the strategy is affected by train speed. Understanding the impact of this factor is essential in order to implement ITPS. In this paper, the effects of train speed were analyzed using a VISSIM simulation model which was calibrated to field conditions. It was concluded that the delay is affected more by train speed than the transitional preemption strategy and the safety of the intersection is not affected by train speed once an advanced preemption warning time(APWT) is equal to or greater than 90 seconds.