• 대한토목학회논문집
• /
• 제39권3호
• /
• pp.431-439
• /
• 2019

여의도 샛강은 1997년 국내최초 생태공원으로 조성된 이후 이용 활성화를 위한 다양한 노력이 투입되었음에도 불구하고 현재의 이용 현황은 인근 한강 공원과 비교했을 때 현저히 저조한 상황이다. 본 연구에서는 샛강 방문자 1,000명을 대상으로 면접 설문조사를 진행하였으며, 이용자들의 샛강에 대한 인식과 활동 패턴 등에 대해 조사하였다. 그 결과 전체 이용자 중 약 60 %가 도보를 이용한 인근 주민이었고, 대부분 가벼운 운동이나 산책을 하며 시간을 보내는 등 일반 서울시내 도시공원과 유사한 특성을 갖는 것으로 나타났다. 또한 다양한 통계분석을 통해 응답자 특성에 따른 샛강에 대한 인식과 활동 패턴 차이를 분석하였으며, 샛강에서의 활동 패턴이 샛강에 대한 만족도, 애착심, 참여의식 등에 미치는 영향에 대해 분석하고 고찰하였다.

• 상하수도학회지
• /
• 제33권4호
• /
• pp.299-309
• /
• 2019

Waterworks facilities inevitably experience some amount of leakage even if there is a lot of investment or state-of-the-art technology that is applied such as DMA(District Metered Area) system construction, leakage detection, repair, pipe rehabilitation, etc. The primary reason is the leakage is naturally restored over time. In the UK, this restoration characteristic is defined as NRR(Natural rate of rise of leakage) and used to decision making for prioritizing active leakage control of DMAs. However, this restoration characteristic is well recognized, but researches on NRR in the water distribution system are insufficient in Korea. In this study, the estimation method of NRR was developed suitable for applicating in Korea considering of SCADA data, water infrastructure, and water usage patterns by modification of the UK's NRR method. The proposed method was applied to 9 DMAs and verified it's applicability by comparing with the other water loss performance indicators. It is expected that the proposed method can be used to support decision making for sustainable NRW(Nor-revenue water) management in the water distribution system.

• 한국기계기술학회지
• /
• 제13권1호
• /
• pp.57-64
• /
• 2011

Recently, all-electrified houses have constructed and some tasks are being carried out to monitor energy consumption patterns. The energy monitoring includes various elements such as temperature, pressure, water flow, $CO_2$, and electricity. In this monitoring, electricity consumption is one of the essential factors because the performance and energy saving levels are described by this physical quantity. This quantity depends on materials, structure, operation of the house, which operation means consumer's life style and usage patterns of home appliances furthermore. Firstly, this paper shows a control simulation method which were developed a few years ago. And some different methods are proposed considering flexible experimental condition.

• 한국지열·수열에너지학회논문집
• /
• 제14권4호
• /
• pp.61-67
• /
• 2018

Solar energy depends on the altitude and azimuth of the sun, and the amount of energy collected on the slope depends on the latitude of the area being installed. However, since most solar heating systems are fixed to the ground, it is necessary to analyze the optimal installation angle from the early design stage. However, problems arise when energy consumption is not considered together because heating systems are not used in the summer In this study, the optimum installation angles of the solar collectors according to the latitude of the installation area are not simply determined by the amount of energy collected, but because the system is overheated due to climate change or energy usage patterns, And the amount of additional energy input.

• 생명과학회지
• /
• 제16권4호
• /
• pp.579-583
• /
• 2006

수돗물에서 생성된 탄소강관위의 생물막에 유리잔류염소와 모노클로라민을 처리하여 세균농도 변화와 그에 따른 탄소원 이용능을 조사하였다. 소독제 농도를 단계적으로 올렸을 때 종속영양세균의 농도는 모노클로라민과 유리잔류염소의 농도가 각 1.5, 1.0 mg/l까지는 대조구에 비해 감소가 없었지만 (P = 0.56, ANOVA) 모노클로라민 2.0 mg/l, 유리잔류염소 1.5 mg/l 일때 감소되었다 (P < 0.01, ANOVA). 소독제의 농도를 단계적으로 높일때 세균활성의 증가 후 감소 그리고 세균농도의 감소가 관찰되었다. 세균농도가 유사하더라도 각 탄소원에 대한 정량적, 정성적 이용도가 서로 달라 군집구조가 상이할 것으로 생각되었다.

• Ecology and Resilient Infrastructure
• /
• 제6권4호
• /
• pp.250-257
• /
• 2019

최근 4대강사업을 통해 국가 주요하천 인근에 약 357개소의 친수공원을 조성하여 국민의 휴식 및 레저공간으로 활용하고, 하천 환경 및 생태적 건강성을 높이고자 하였으나 실제 활용도가 저조하여 친수지구의 수를 297개소로 축소하고, 친수지구 계획 및 관리를 위한 노력을 많이 하고 있다. 특히 이용객 수 조사 및 예측을 좀 더 과학적이고 체계적으로 하기 위해 통신 빅데이터를 활용하는 시도가 이루어지고 있다. 하지만 기존 사람이 현장 조사를 하는 방식과 비교하여 통신 빅데이터를 활용할 경우 공간적인 이용객 이동 패턴을 간편하게 파악할 수 있지만 실제 이용객 수와는 차이가 있기 때문에 이를 해결하기 위한 다양한 검증이 필요하다. 이에 본 연구에서는 낙동강 하구에 위치한 삼락생태공원을 대상으로 통신 빅데이터를 활용한 이용객 이동 패턴과 무인기를 활용한 이용객 수를 비교하여 통신 빅데이터를 활용한 이용객 수 추정의 정확도를 평가하였다. 그 결과 하천 친수지구의 경우 pCELL의 정밀도가 낮아 시설물별 이용 패턴을 정밀하게 추정하기 어려웠으며, 도로 및 주차장 등에 멈춰 있는 신호들 때문에 공원 내 이용 패턴이 왜곡될 수 있음을 확인하였다. 따라서 향후 통신 빅데이터 처리에 있어서 친수지구 내 pCELL 수를 확충하고 도로 및 주차장 등의 시설물을 제외한 이용객 수 추정할 수 있도록 개선이 필요한 것으로 나타났다.

• 한국농공학회논문집
• /
• 제62권6호
• /
• pp.73-83
• /
• 2020

Agricultural drought is a natural phenomenon that is difficult to observe and quantitatively express, and agricultural water use is high and usage patterns are diverse, so even if there is a lack of rainfall. The frequency and severity of agricultural drought are increased during the irrigation period where the demand for agricultural water is generated, and reasonable and efficient management of agricultural water for stable water supply is required. As one method to solve the water shortage of agricultural water in an unstructured method, it is necessary to analyze the appropriate supply amount and supply method through simulation from the intake works to the canals organization and paddy field. In this study, irrigation efficiency was analyzed for irrigation systems from April to September over the past three years from the Musu Reservoir located in Jincheon-gun, Chungcheongbuk-do and Pungjeon Reservoir located in Seosan-si, Chungcheongnam-do. SWMM (Storm Water Management Model) was used to collect agricultural water, and irrigation efficiency analysis was conducted using adequacy indicators, and water supply vulnerability. The results of the agricultural water distribution simulation, irrigation efficiency and water supply vulnerability assessment are thought to help the overall understanding of the agricultural water supply and the efficient water management through preliminary analysis of the methods of agricultural water supply in case of drought events.

• 상하수도학회지
• /
• 제37권6호
• /
• pp.363-373
• /
• 2023

Numerous studies have established a correlation between sociodemographic characteristics and water usage, identifying population as a primary independent variable in mid- to long-term demand forecasting. Recent dramatic sociodemographic changes, including urban concentration-rural depopulation, low birth rates-aging population, and the rise in single-person households, are expected to impact water demand and supply patterns. This underscores the necessity for operational and managerial changes in existing water supply systems. While sociodemographic characteristics are regularly surveyed, the conducted surveys use aggregate units that do not align with the actual system. Consequently, many water demand forecasts have been conducted at the administrative district level without adequately considering the water supply system. This study presents an upward water demand forecasting model that accurately reflects real water facilities and consumers. The model comprises three key steps. Firstly, Statistics Korea's SGIS (Statistical Geological Information System) data was reorganized at the DMA level. Secondly, DMAs were classified using the SOM (Self-Organizing Map) algorithm to consider differences in water facilities and consumer characteristics. Lastly, water demand forecasting employed the PCR (Principal Component Regression) method to address multicollinearity and overfitting issues. The performance evaluation of this model was conducted for DMAs classified as rural areas due to the insufficient number of DMAs. The estimation results indicate that the correlation coefficients exceeded 0.9, and the MAPE remained within approximately 10% for the test dataset. This method is expected to be useful for reorganization plans, such as the expansion and contraction of existing facilities.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2023년도 학술발표회
• /
• pp.182-182
• /
• 2023

Since China adopted Public Private Partnerships (PPPs) in the 1980s, China has relied on water PPPs to expand appropriate water facilities.. According to the World Bank data from 1994 to 2020, the top five provinces hosted over 40 percent of total PPPs, with four of them located in the Huadong area and one in the Henan area. A vast gap exists between the group attracting the most PPPs and the group hosting the least. This study explores Guangdong and Shandong provinces, which have led most PPPs in China. Coincidently, these areas are also famous for the typical areas to show the Chinese economic policy after the open-door policy. They have achieved economic development and rapid urbanization rates based on the large scale of Foreign Direct Investment inflow and export-oriented manufacturing industry, as well as their active participation in PPPs over the last thirty years. An economic approach can provide valuable insights into the development of water infrastructure. Adequate urban infrastructure has been shown to impact local economic development positively. Water infrastructure also provides a basic and sustainable environment for economic activities by satisfying more water usage, improving the efficiency of the water supply, and reducing water pollution caused by industrial activities. However, it remains only partially understood without inclusive research on the issues related to water resources in each province. For instance, existing studies have been limited to explaining slightly different patterns of water PPPs between Guangdong and Shandong at the beginning of the PPP era. This study aims to elucidate the development pattern of water PPPs in each province from multi-dimensional aspects. Therefore, the study will help understand why China boosted the development of the private water market.

• 설비공학논문집
• /
• 제27권9호
• /
• pp.455-462
• /
• 2015

Residential buildings account for a significant portion of the total building-energy usage in Korea, and a variety of research studies on the domestic boiler have therefore been carried out; however, most of these studies examined the boiler itself, whereby the part-load ratio characteristics and the corresponding gas-energy consumption patterns were not analyzed. In this study, the part-load ratio and operating characteristics of a domestic gas boiler were analyzed within a residential building equipped with a radiant floor-heating system; in addition, the energy consumption between condensing and conventional boilers was comparatively analyzed. Our results show that significant portions of the total operating hours, heating load, and energy consumption are in the part-load ratio range of 0 through 40%, whereby the energy consumption was significantly affected by the boiler efficiency under low part-load conditions. These results indicate that the part-load operation of a boiler is an important factor in residential buildings; furthermore, replacing a conventional boiler with a condensing boiler can reduce annual gas-energy usage by more than 20%.