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수록정보
수록범위 : 1권1호(2000)~23권5호(2022) |수록논문 수 : 1,190
한국환경기술학회지
23권5호(2022년 10월) 수록논문
최근 권호 논문
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KCI등재

저자 : Hyunju Park , Mooyoung Han , Tschung-il Kim

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 5호 발행 연도 : 2022 페이지 : pp. 251-257 (7 pages)

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Water demand is increasing because of population increases and industry developments as well as demands for improved living standards. Existing water treatment and supply systems cover large areas and have a centralized system; consequently, development of new water resources requires a construction of pipe infrastructure over long distances. The variability of water quantity, as climate changes, is hampering efforts to secure water resources and decide facility capacity. Therefore, a new urban water management system to address these problems is required. This study suggests such a system as well as a new index, i.e., the water self-sufficiency ratio (WSSR) for evaluating the system. WSSR is calculated by dividing the total self-provided water quantity with the total water use in a city. The current WSSR for Suwon City is 11 %, but there are plans to achieve 50 %. This would be accomplished by using rainwater (26.8 million ton/year), encouraging water conservation (31.3 million ton/year), building tunnel-type rainwater-retention facilities (2.5 million ton/year) and reusing treated sewage (1.72 million ton/year). In addition, financial incentives are expected through such as reduction of floor area proportion, tax reduction and governmental subsidies. The WSSR is expected to be useful in evaluating urban water self-reliance as well as in quantitativly establishing a sustainable water management system.

KCI등재

저자 : Gyeong Cheol Jo , Hyo Sub Lee , Chang-jun Lee , Sang-ik Suh , Seo Jin Ki

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 5호 발행 연도 : 2022 페이지 : pp. 258-263 (6 pages)

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We developed sequential deep learning models to predict time-series water quantity and quality data. The data set consisting of 10 input variables was prepared from a watershed model Hydrological Simulation Program - FORTRAN (HSPF) fine-tuned to existing conditions in the Nam River Basin on a daily time step for the simulation period 2019-2021. The whole data set was partitioned into training and test sets in the ratio 7 to 3. The predictive accuracy of four deep learning models, created differently in terms of the types of algorithms as well as the number of layers, was tested with respect to mean squared error (MSE). We found that changes in input time steps from 1 to 2 days led to a sharp reduction in prediction errors of all applied models for two target variables during the training and test phases, except for a few cases. In addition, at least 3 important variables were enough to maintain the predictive accuracy of the original deep learning model with 10 variables. The performance of the deep learning model was sensitive to output time steps rather than input time steps. In all test conditions, the MSE values were extremely low, reaching as high as 0.0056. Therefore, sequential deep learning models, regardless of their types and architectures, are most suitable for predictive modeling of time series data compiled on a daily basis or less such as remote sensing data in hydrology and agriculture.

KCI등재

저자 : Chang-in Son , Choon-ki Na

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 5호 발행 연도 : 2022 페이지 : pp. 264-270 (7 pages)

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Aqueous ammonia is a promising alternative solvent for the post-combustion CO2 capture technology due to its high CO2 removal capacity, low material costs and regeneration energy. However, its high volatility and low reactivity to CO2 limit its application. Therefore, more effort is still needed to improve ammonia-based CO2 capture process. In this work, the performance of CO2 capture in a packed tower using the ammonia solution and fibrous packing was experimentally investigated. The effects of key operating factors, such as packing type, packing height, liquid-gas (L/G) ratio, aqueous ammonia concentration and pH of absorbent, on the CO2 removal efficiency, CO2 capture capacity, and outlet gaseous NH3 concentration have been revealed. The CO2 capture efficiency was greatly improved when using the fibrous packing. Of the operating factors investigated, the one that had a greater effect on CO2 capture was the gas flow rate; the lower the gas flow rate, the higher the CO2 capture efficiency and the lower the ammonia evaporation. Considering the CO2 capture efficiency and ammonia evaporation, an L/G ratio ≤ 5 and a superficial velocity ≤ 5.1 cm/s could be recommended.

KCI등재

저자 : Hongin Kim , Sungjun Park , Gyeongho Park , Kunekwan Song

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 5호 발행 연도 : 2022 페이지 : pp. 271-277 (7 pages)

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TES system is an excellent system that can solve the problem of imbalance in energy production and consumption by fusion with renewable energy such as solar and waste heat. Now, it is time to seriously consider the efficient use of new and renewable energy using heat storage systems to achieve the 2030 Nationally Determined Contributions (NDC) of Korea. Recently, in the agricultural field, a heat storage system demonstration project to reduce fuel costs and greenhouse gases through the reuse of waste heat is attracting attention. In this study, a Latent Heat Thermal Storage system using Phase Change Material (PCM) was operated. The capacity of the heat storage system was 2 GJ, and it was possible to reduce the heating fuel cost of the 991 m2 size Greenhouse by 67.2 % through the demonstration for a total of 30 days of continuous operation.

KCI등재

저자 : Byoung-sam Kim , Woo-jin Kim

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 5호 발행 연도 : 2022 페이지 : pp. 278-285 (8 pages)

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A theoretical model was studied to describe the sound radiation created by surface vibration of in-service tires. The tire is modeled as a circular ring model. The effects of normalized frequency and the structural loss factor are included. The radiation sound power is calculated as a function of the normalized frequency and the structural loss factor though numerical integration of the sound pressure. The basic sound radiation mechanism is shown to be a damped progressive wave field on the structure in the vicinity of the applied force. The result indicates that the potential sound reduction might be obtained if the values of the normalize frequency and structural loss factor are investigated.

KCI등재

저자 : Hyeok-jung Kim , Nam-wook Kim

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 5호 발행 연도 : 2022 페이지 : pp. 286-293 (8 pages)

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Efforts are being made to efficiently utilize national resources by appropriately disposing of construction waste from construction works and promoting recycling. Until now, research has been conducted using recycled aggregates and fine powders generated in the process of destroying and upgrading concrete structures, but it is pointed out that practical applicability is still a problem due to the lack of economic feasibility due to the high processing cost. In this respect, recycling concrete, which is a concrete that can be manufactured and used as a raw material and recycled aggregate of cement, has emerged as a realistic alternative, and practical research is currently underway.
This research seeks to derive the fine powder from the basic experimental results for the eco-friendly development of recycled concrete and mortar manufactured through powder adjustment rather than high-level treatment.

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