• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2008.04a
• /
• pp.162-163
• /
• 2008

• Journal of Korean Society on Water Environment
• /
• v.29 no.3
• /
• pp.438-442
• /
• 2013

According to Geum-River restoration project, given conditions for management of water environment in the Geum-River were changed. Because of those changes, this study was investigated the establishment of water quality standards and water quality target in the Geum-River basin. For management of water environment in the Geum-River, the sub-basins and watersheds are newly divided and the water quality and ecosystem standards in the sub-basins are reestablished. Considering the consistency of water environment policy and legal system, the legal name of sub-basins and watersheds are unified. TMDL (total maximum daily load) should be implemented in the sub-basin where exceeds the water quality standards and the number of water pollutant among the water quality parameters which exceeds the water quality standards are extremely minimized. The water quality target of water pollutant for implementation of TMDL should be established same or higher concentration of water quality standards.

• KIEAE Journal
• /
• v.13 no.1
• /
• pp.3-8
• /
• 2013

Environmental quality(EQ) is one of the most important components of the assessment of "Quality of Life(QOL)". Most EQ related research dealt with overall built environmental quality issues as represented by several clusters of factors related to occupants' satisfaction. This paper aims to identify and understand the theoretical background and the occupants' comparative standards of response to conditions of the built environment related to environmental quality(EQ). Therefore, this paper have reviewed the theoretical framework and empirical research for environmental quality in built environment. the concept of environmental quality if elaborated from diverse perspectives. Different ways of interpreting environmental quality have led to a variety of ways to conduct evaluations. A review of the theories and methods used for the analysis of perceived environmental quality provides a strong foundation for new research frameworks and environmental quality in built environment.

• Journal of Korean Society on Water Environment
• /
• v.39 no.1
• /
• pp.46-60
• /
• 2023

Climate change causes fluctuations in water quality in the aquatic environment, which can cause changes in water circulation patterns and severe adverse effects on aquatic ecosystems in the future. Therefore, research is needed to predict and respond to water quality changes caused by climate change in advance. In this study, we tried to predict the dissolved oxygen (DO), chlorophyll-a, and turbidity of the Paldang reservoir for about two weeks using long short-term memory (LSTM) and gated recurrent units (GRU), which are deep learning algorithms based on recurrent neural networks. The model was built based on real-time water quality data and meteorological data. The observation period was set from July to September in the summer of 2021 (Period 1) and from March to May in the spring of 2022 (Period 2). We tried to select an algorithm with optimal predictive power for each water quality parameter. In addition, to improve the predictive power of the model, an important variable extraction technique using random forest was used to select only the important variables as input variables. In both Periods 1 and 2, the predictive power after extracting important variables was further improved. Except for DO in Period 2, GRU was selected as the best model in all water quality parameters. This methodology can be useful for preventive water quality management by identifying the variability of water quality in advance and predicting water quality in a short period.

• Journal of Korean Society on Water Environment
• /
• v.22 no.5
• /
• pp.737-747
• /
• 2006

Ministry of Environment (MOE) of Korea has been implementing the water quality management policy to focus on the control of organic matters (BOD and COD) for 28 years since 1978 when the water quality standards had been established. However, the government and the public have begun to recognize the necessity of creating the best water environment for people and aquatic life, and also formulating the various measures of water pollution, Consequently, MOE of Korea is establishing the basic plan of water environment management, with the vision of "Clean Water, Eco River 2015." The major targets of water environment management plan are to maintain ecosystem health and to protect water quality from various hazardous substances in water bodies. In order to achieve the major targets, it is essential to amend the water quality standards, which bring about the systematic management of various pollutants and healthy ecosystem. Introduction of the new techniques of water environment assessment is also prerequisite to maintain sustainable water environment. These can be accomplished under the consideration of following suggestions in environmental quality standards. First, several criteria should be complemented in water quality standards; they include the improvement of the current water quality classification system, the strengthening and supplement of relevant parameters considering human health in the standards, the introduction of biotic indices, and management standards on eutrophication. Secondly, it should be considered to introduce the biological water quality standards using biotic indices and the management standards for sediments. Lastly, it needs to introduce or develop an ecological status classification which could be used in the assessment of the water environment as a whole.

• Journal of Environmental Impact Assessment
• /
• v.17 no.6
• /
• pp.373-380
• /
• 2008

The Ministry of Environment plans to improve quality of water which is achieved over 85% in rivers and 94% in lakes of the whole country as "Good Water" until 2015. Also, the law of evaluation of water quality and water quality goal were made newly. So, the water quality has evaluated by using new law since 2007. This study evaluated whether "Good Water" and" Water Quality Goal" were achieved or not in 22 middle-sized districts and major 10 lakes of Geum river. The achievement rates of rivers decreased and the achievement rates of lakes mostly were the same for 5 years. In 2007, the achievement rates of "Good Water" were 50% in rivers and 50% in lakes. The achievement rate of "Water Quality Goal" were 59.1% in rivers and 20% in lakes. The water quality in 2007 was evaluated worse than last year in case of rivers. The evaluations of Korea-Comprehensive Water Quality Index(K-CWQI) showed that achievement rates of "Water Quality Goal" were 81.8% in rivers and 0% in lakes. The statistical correlation analysis showed that correlations between BOD and COD were meaningful at the downstream, compared to upstream, generally. In case of lakes, correlations between COD and temperature were meaningful. Also, correlations between COD and Chl-a were meaningful. The Trophic State Index ($TSI_{KO}$) showed that the half of lakes are major over eutrophic status in lakes. These analytical methods such as K-CWQI, $TSI_{KO}$, statistical correlation analysis could be additionally helpful for evaluation of water quality and provide basis data for understanding characteristics of watershed in Geum river.

• Journal of Korean Society on Water Environment
• /
• v.28 no.1
• /
• pp.18-25
• /
• 2012

For effective watershed management, it is very important to select the tributaries through selection and concentration of targeted tributary catchments for improving water quality within the limited financial conditions. This study introduced the selection and diagnosis procedure of tributary catchments for improving water quality at Chungcheongnam-do based on water quality and flowrate monitoring, stream grouping method. The tributaries with high value of water quality and flowrate were selected for improving water quality according to stream grouping method. The diagnosis of selected tributaries for improving water quality was performed with analysis of the pollution load (generated, discharged, delivered) and point source discharged pollution load density. The plans for improving water quality of tributaries were suggested thorough various diagnosis of tributary catchments. For improving water quality of tributaries in Chungcheongnam-do, the tributary catchments in the Dangjin, Asan, Yesan, Cheonan, Hongseong area should be preferentially considered. The water quality improving plans for those tributary catchments, in accordance with the reduction of sources of pollution by population and livestock, should be established.

• Culinary science and hospitality research
• /
• v.20 no.4
• /
• pp.224-238
• /
• 2014

This study aimed to identify that the physical environment of a food service company has influenced on the perceived service quality, menu quality and customer satisfaction. To achieve the purpose of this study, it reviewed the theoretical background about the physical environment, the perceived service quality, the perceived menu quality and customer satisfaction. Moreover, this study conducted a corresponding empirical analysis. For the empirical analysis, a questionnaire was given to a total of 275 regular restaurant customers at Busan area. The results of the empirical analysis were shown as follows. 1) The components of physical environment of a service company are the attractiveness, cleanliness, space & convenience and the ambient factor of physical environment. 2) For the attractiveness of the physical environment, cleanliness and the ambience factors of the physical environment have influenced on the perceived service quality and menu quality. 3) The perceived service quality has influence on the perceived the menu quality. 4) The perceived service quality and the menu quality have influence on the customer satisfaction.

• Journal of the Korean Society of Food Culture
• /
• v.30 no.5
• /
• pp.629-643
• /
• 2015

The goal of the current study was to analyze major factors for improvement of quality of life in contract foodservice customers. This study investigated how characteristics of customers, foodservice management, and competitors differ in different contract foodservice business environments in order to understand increasing concerns over health, in-house working, and the environment, which are directly connected to work and life satisfaction and company profits. For the foodservice business environment, this study classified environmental factors reported by Duncan (1972) into three factors: customer environment, foodservice management environment, and competitor environment. Multi-regression analysis was conducted on quality of life using the Korean version of the WHO Quality of Life Scale Abbreviated Version (WHOQOL-BREF). Sub-factors of the contract foodservice business environment included foodservice management environment, customer environment, and competitor environment in the order of importance. The results indicate that the foodservice management environment of the company or organization where the customer is employed has the most substantial influence on quality of customer life.

• Journal of environmental and Sanitary engineering
• /
• v.16 no.4
• /
• pp.55-61
• /
• 2001

There are many reservoirs used as the source of water supply and they show various specific characteristics in water quality depend seasonal. Especially, there were not a little variations of water quality in summer, as a natural consequence it follows that stratification occured phenomenon and changed anaerobic condition in the bottom of reservoir, and then accumulated Fe and Mn substance in soil and sediment were resolved into water, it attributes to coloration. G purification plant located in Y gun is very small plant in which coloration occurs by Fe and Mn in every summer. Using this plant as a model, the removal methods of Fe and Mn were studied. After prechlorination plus LAS coagulation, Fe, Mn, $NH_3-N$ were decreased from 7.290 mg/l to 0.080 mg/l, from 0.480 mg/l to 0.075 mg/l, from 0.55 mg/l to 0.04 mg/l. But $THM_{s}$ was increased from 0.050 mg/l to 0.044 mg/l. It shows that the prechlorination plus LAS coagulation treatment process in purification plant is effective to remove Fe and Mn ion.