• Journal of Korean Society for Atmospheric Environment
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• v.19 no.E2
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• pp.75-81
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• 2003

Variational data assimilation, which is recently introduced to the air quality modeling, is a promising tool for obtaining optimal estimates of initial conditions and other important parameters such as emission and deposition rates. In this paper. two advanced techniques for variational data assimilation, based on the adjoint and quasi-inverse methods, are tested for a simple air quality problem. The four-dimensional variational assimilation (4D-Var) requires to run an adjoint model to provide the gradient information in an iterative minimization process, whereas the inverse 3D-Var (I3D-Var) seeks for optimal initial conditions directly by running a quasi -inverse model. For a process with small dissipation, I3D-Vu outperforms 4D-Var in both computing time and accuracy. Hybrid application which combines I3D-Var and standard 4D-Var is also suggested for efficient data assimilation in air quality problems.

• Journal of Environmental Impact Assessment
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• v.28 no.1
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• pp.35-48
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• 2019

Long term flow measurement and water quality analysis data need to determine the target and allowable load for each basin in Total Water Pollution Load Management System (TWPLMS). The Load Duration Curve (LDC) is analyzed the relationship between flow data and water quality, and evaluates the pollutant load characterization by flow conditions. LDC of Kyeongancheon is created by the Flow Duration Curve (FDC) that was analyzed 8-day interval measured flow data from 2006 to 2015 and numeric water quality target in Kyeongancheon. As a result of this study, it is necessary to manage the point source pollutant because the numeric water quality target is not satisfied in the low flows. Also the numeric water quality target has been exceed for four months from March to June of the year and continuous and systematic watershed management is required to satisfy the numeric water quality target.

• Journal of Digital Convergence
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• v.10 no.10
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• pp.353-362
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• 2012

The purpose of this study tried to find ways to improve service quality for customers and effective program of organizational support to increase the hotel employees' job satisfaction to empirically analyze causatively impacted relationship between the perceived organizational support, job satisfaction, and service quality in the hotel industry staff recognize. Data were collected from 217 and surveyed from 1 to 30 in November 2011 in hotel. To summarize the results of the study, first, satisfaction of individual job environment, satisfaction of work environment support concerned in support for personal values both was not affected significantly. Second, support for work environment was also affecting more than support for personal worth to improve the quality of customer service and in support for the organization Third, satisfaction of the individual's work environment affected adaptability, conviction, and corporality in job satisfaction variables while support satisfaction for working conditions effected conviction and adaptability without corporality. In order to enhance adaptability to customers who employees serve, it should be created work environment to make employees feel satisfaction in individual's work environment. Therefore, hotel managers have to entertain feelings of loyalty for their hotel and make employees satisfaction with their job and their duty by enhancing support for work environment of hotel employees in order to increase business performance by improving service quality for customers.

• The Journal of the Korea Contents Association
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• v.16 no.5
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• pp.533-547
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• 2016

The goal of this study is to analyze the effect of the working environment of elderly care facility employees on the care service quality and the mediation effect of social support. The results of the research were as follows: First, it has been confirmed that a high level of average monthly salary and the salary satisfaction theref have a positive correlation with an improvement in care service quality in the working environment variables of elderly care facility employees. Second, it has been confirmed that the average monthly salary and the salary satisfaction level among the working environment variables of elderly care facility employees have a positive correlation on the parameter of social support. Third, a partial mediation effect of social support has been confirmed in the effect that average monthly salary and the salary satisfaction level variables have on the quality of care service in the working environment of elderly care facility employees. Thus, this study actively reflects the social situation of an aged society and uses "Self-checking Management Measures" capable of suggesting the management direction for the elderly care facility to measure its service quality and proposes a method to improve the working environment of the elderly care facility employees.

• Journal of Korean Society on Water Environment
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• v.16 no.4
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• pp.533-539
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• 2000

A bench-scale reactor using SBR process was experimented with an synthetic wastewater. The main purpose of this investigation was to evaluate applicability in the field and process removal efficiencies in terms of BOD and T-P and its corresponding kinetic parameters. Removal rate of phosphorus was 77% in terms of total phosphorus. Effluent concentrations were $9.8mg/{\ell}$ BOD and $1.1mg/{\ell}$ T-P. Effluent quality was maintained consistently stable by controlling decant volume and operating cycles. The efficiency for phosphorus removal was increased due to decrease in BOD-SS loading value in the range of $0.25{\leq}$aeration time ratio${\leq}0.52$.

• Journal of Korean Society on Water Environment
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• v.23 no.5
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• pp.620-627
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• 2007

In this study a general analysis method for watersheds with the entire runoff conditions and corresponding water quality is proposed and its applicability based on the currently available information is investigated. Using the 8-day-interval data set of runoff and water quality observed by Nakdong River Environment Research Center, the flow duration curve and discharge-load relation curve for each unit watershed are established, then the load duration curve is finally constructed. This paper discusses how the load duration curve can be used in the assessment of TMDL. The entire Nakdong river watershed is also divided into prior managing areas of point sources or non-point sources in a way of general management. It is thought that LDC can be a great tool for visualizing overall probabilities of current water quality and thus for the TMDL management.

• International Journal of High-Rise Buildings
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• v.6 no.2
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• pp.197-205
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• 2017

The conflict between indoor environmental quality and energy consumption has become an unneglectable problem for highrise office buildings, where occupants' productivity is highly affected by their working environment. An effective Façade, therefore, should play the role of an active building skin by adapting to the ever-changing external environment and internal requirements. This paper explores the energy-saving and indoor environment-improving potential of a phase-change material (PCM) integrated Façade. Building performance simulations, combined with parametric study and sensitivity analysis, are adopted in this research. The result quantifies the potential of a PCM-integrated Façade with different configurations and PCM properties, taking as an example a south-oriented typical office room in Shanghai. It is found that a melting temperature of around $22^{\circ}C$ for the PCM layer is optimal. Compared to a conventional Façade, a PCM-integrated Façade effectively reduces total energy use, peak heating/cooling load, and operative temperature fluctuation during the periods of May-July and November-December.

• Journal of the Korean Society of Food Culture
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• v.21 no.1
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• pp.51-56
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• 2006

This research suggests critical and specific decisive variables that affect general service quality of the products in family restaurants, considering features of services in which consumption and production happens simultaneous by collecting the raw data through point of sales. It also analyses the factors and helps to offer them practical strategies by providing managers of the restaurants and marketers with empirical viewpoints based on the research. Generally, family restaurants need their own physical environment and are required to encourage customers to revisit themselves by maintaining pleasant environment as well as, considering space for customers and for employees' working routes and effective maintenance of the facilities. The result of the study also tells that even if the unimportant factors did not affect much on the restaurants, management over these factors can be a differentiated strategy for competitive advantage over the other businesses.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2005.11a
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• pp.296-297
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• 2005

• Journal of Korean Society for Atmospheric Environment
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• v.14 no.3
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• pp.251-260
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• 1998