• Proceedings of KOSOMES biannual meeting
• /
• 2017.11a
• /
• pp.220-220
• /
• 2017

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.1
• /
• pp.249-255
• /
• 2014

This paper deals with measurement on the economic impact of tax-free oil for Agriculture in Korea. According to increasing of world oil price, the supply policy of agricultural tax-free oil, which specified to support farmers since 1986, are required to expand by farmers. But the supply quantity of tax-free oil is deceased continuously and Korean Ministry of Trade, Industry, and Energy(MOTIE) present stance of sundown policy of tax-free oil for agriculture. In this context, It is necessary and important to measure the economic impact of the supply policy of tax-free oil for agriculture. This study address a econometric method for measurement the economic impact of the supply policy of tax-free oil and suggest several policy implements. Our results show that when the supply policy of tax-free oil for agriculture is annihilated in phases over the five years. the agricultural GDP is decreased by about 3,195 billion korean won and the agricultural price level is increased by 26.6 points after 5 years.

• Journal of the Korean Society of Systems Engineering
• /
• v.7 no.2
• /
• pp.1-5
• /
• 2011

The purpose of the Environment Design (ED) for Main Control Room (MCR) of Nuclear Power Plant (NPP) is to provide and create an optimal working space to be free from physical, physiological and mental stress as well as environmental discomfort, based on the previous environment design experiences and to recommend the best ED including the color, the lighting and the interior design. Environment Design consists of three main areas: Human factor engineering design, Interior design with color design, and Lighting design. These design areas have been interactively cooperated in a way that each design specialist would share the objectives and concepts of the Environment Design for MCR. The specialists for Human Factors Engineering design had a corporative role in such a way to provide the guidelines for MCR design suitability of Interior and Lighting design considering the Human System Interface (HSI) safety concerns. This paper describes fruitful efforts to create the best fit for MCR ED among several design proposals with the design recommendations, impacts, and contributions to NPP environment.

• Journal of Korean Society on Water Environment
• /
• v.33 no.4
• /
• pp.487-493
• /
• 2017

This study was conducted to propose measures of water quality management as the water criteria for waterscape facilities which have been highlighted as alternatives to wading pools in summer season was legislated. The number of public waterscape facilities has reached 290 sites in Gyeounggi province and 971 sites in South Korea in 2017. The water tank capacity of 80.3 % public waterscape facilities was less than $100m^3$. Facilities with disinfection system were only 6.5 % and facilities with filtration function were also very low at 6.9 %. Most of the waterscape facilities, about 93%, are expected to be vulnerable to complying with revised water quality criteria because they have to be disinfected by handling. Chlorine disinfectants, which are more persistent than ozone or ultraviolet sterilization methods, are more preferred. However, care should be taken when adding disinfectans because hypochlorous acid, which is an effective component of chlorine disinfectant, remains after the disinfection, but it is easily decomposed with time. For this study, ${\bigcirc}{\bigcirc}$ park floor fountain with a capacity of $63m^3$ was selected and the amount of free residual chlorine concentration was measured by injecting a certain amount of chlorine bleach. As a result, it took 5 hours to decrease from the water quality standard of 4 mg/L to 0.04 mg/L. If the waterscape facility is operated for 7 to 8 hours, the chlorine bleach should be re-injected after 5 hours. In addition, the problem of pH increase due to the input of chlorine disinfectant is expected, and the neutralization method using vinegar was proposed.

• 제어로봇시스템학회:학술대회논문집
• /
• 2005.06a
• /
• pp.308-313
• /
• 2005

For a real-time quadruped robot running control, there are many important objectives to consider. In this paper, the running control architecture based on global states, which describe the cyclic target motion, and central pattern is proposed. The main goal of the controller is how the robot can have robustness to an unpredictable environment with reducing calculation burden to generate control inputs. Additional goal is construction of a single framework controller to avoid discontinuities during transition between multi-framework controllers and of a training-free controller. The global state dependent neuron network induces adaptation ability to an environment and makes the training-free controller. The central pattern based approach makes the controller have a single framework, and calculation burden is resolved by extracting dynamic equations from the control loop. In our approach, the model of the quadruped robot is designed using anatomical information of a cat, and simulated in 3D dynamic environment. The simulation results show the proposed single framework controller is robustly performed in an unpredictable sloped terrain without training.

• Journal of the Korean housing association
• /
• v.26 no.6
• /
• pp.115-126
• /
• 2015

Using the 2013 Korea Housing Survey, this research analyzed factors influencing residential satisfaction of low-income households concerning the economic condition, satisfaction about interior and exterior environments in dwelling, recognition of housing welfare policy. The economic condition showed that if there are less living expenses and more ordinary income, it brought about more positive effects in the ownership of a detached house, row and multi-family house. Most variables about satisfaction with the interior environment in dwelling have a significant influence on a detached house, apartment, row and multi-family house. The following factors played a significant role: accessibility to commercial facilities, neighborhood relationship and natural environment in the satisfaction with the exterior environment in dwelling about most types. Specifically, from an institutional perspective of housing welfare policy, the effect of the housing expenses support and the intention about remodeling were factors influencing residential satisfaction in cheonsei and monthly rent, free of a detached house and free of an apartment. These results will utilize preliminary data to establish housing welfare policy for low-income households.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.29 no.10
• /
• pp.799-804
• /
• 2018

In this paper, a method for measuring the dielectric constant of a planar dielectric substrate using the free space material constant measurement method in a general measurement environment is proposed. Two horn antennas and a network analyzer were used for S-parameter measurement and the transmission and reflection coefficients of a planar dielectric substrate were calculated from the measurement results. To obtain a reliable dielectric constant in a low-precision-measurement environment, only the magnitude of the transmission coefficient, which has a small error due to the measurement environment, is used for dielectric constant estimation. Finally, the dielectric constant is determined by comparing the measured results at different frequencies.

• The Journal of Korean Medicine
• /
• v.38 no.2
• /
• pp.1-6
• /
• 2017

Objectives: Natural environment therapy is considered as an option for atopic dermatitis. This study was aimed to examine the beneficial effects of natural environment therapy among patients with atopic dermatitis who have moved in an atopy-free village. Methods: The questionnaire-based survey was conducted from parents of 20 children with atopic dermatitis (12 male and 8 female, median age 8 years, ranging from 6 to 13 years). The questionnaire consisted of 10 questions for the changes of two typical symptoms of pruritus and sleeping difficulty after moving into an atopy-free village. Results: 75.0% and 88.9% of patients have a family history (at least one parent and one of siblings respectively) of allergic disorders. The median staying period of patients was 27.6 months (ranging from 2 to 55 months). The score indicating pruritus was significantly improved from $6.2{\pm}2.8$ into $4.8{\pm}1.8$ (p<0.05), and sleeping difficulty was also improved from $5.7{\pm}2.9$ into $4.3{\pm}2.1$ (p<0.05) too. Conclusions: This study suggests that the natural environmental therapies could be a choice for patients with atopic dermatitis, which should be studied further for their scientific evidence and mechanisms.

• Journal of Korean Society on Water Environment
• /
• v.27 no.6
• /
• pp.769-775
• /
• 2011

An experimental study of biofilm nitritation system for high-strength ammonium wastewater has been carried out to examine the temperature effect on different organic and solid concentration. Operating temperature varied from $35^{\circ}C$ to $15^{\circ}C$. The influent N concentration of identical three reactors was adjusted to about $300mg\;NH_4-N/L$. A control unit fed with a synthetic wastewater, while the others were fed with reject water which is consisted of the supernatant of both digester and thickener. The results indicated that nitrite accumulation was stable in temperature range of $35^{\circ}C$ to $25^{\circ}C$. However, nitritation was significantly reduced at below $20^{\circ}C$. Free ammonia (FA) and free nitrous acid (FNA) were major inhibitors to the nitrite oxidizer for nitrite accumulation in lower temperature. From the estimation of temperature coefficient (${\Theta}$) of biofilm and suspended nitritation system, biofilm nitritation system could absorb the negative temperature effect compared with suspended nitritation system.

• Steel and Composite Structures
• /
• v.46 no.4
• /
• pp.553-563
• /
• 2023

In the current research, the nonlinear free vibrations of curved pipes made of functionally graded (FG) carbon nanotube reinforced composite (CNTRC) materials are investigated. It is assumed that the FG-CNTRC curved pipe is supported on a three-parameter nonlinear elastic foundation and is subjected to a uniform temperature rise. Properties of the curved nanocomposite pipe are distributed across the radius of the pipe and are given by means of a refined rule of mixtures approach. It is also assumed that all thermomechanical properties of the nanocomposite pipe are temperature-dependent. The governing equations of the curved pipe are obtained using a higher order shear deformation theory, where the traction free boundary conditions are satisfied on the top and bottom surfaces of the pipe. The von Kármán type of geometrical non-linearity is included into the formulation to consider the large deflection in the curved nanocomposite pipe. For the case of nanocomposite curved pipes which are simply supported in flexure and axially immovable, the motion equations are solved using the two-step perturbation technique. The closed-form expressions are provided to obtain the small- and large-amplitude frequencies of FG-CNTRC curved pipes rested on a nonlinear elastic foundation in thermal environment. Numerical results are given to explore the effects of CNT distribution pattern, the CNT volume fraction, thermal environment, nonlinear foundation stiffness, and geometrical parameters on the fundamental linear and nonlinear frequencies of the curved nanocomposite pipe.