• The Journal of the Korea Contents Association
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• v.17 no.4
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• pp.488-499
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• 2017

This study analyzes the effects of residential satisfaction factors of small sized housing, according to the costumer groups based demographic aspects. To attain the goal of this study, we set 8 groups (male and female : 2 groups, ages : 3 group, marriage : 2 groups, including whole group : 1) and selected 6 independent variables such as the social factor, economic factor, accessibility factor. external comfort factor, physical factor, and convenience of living factor. As a result, it is found that the economic factor has the statically significant determinant in all the 8 groups, with big positive coefficient. And the convenience of living factor is another important significant determinant in 6 groups. But the physical factor shows low the significant influence or insignificant influence in the all groups. Other factors, such as the external comfort factor, the social factor, accessibility factor. and convenience factor, are different depending on the groups.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.11 no.6
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• pp.51-59
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• 2016

Recently the company is getting bigger and has many employees. Therefore, sometimes, the uniform internal marketing devices for whole employees are inappropriate because they are different demographic aspects. To find efficient internal marketing factors, this paper analyzes empirically the determinants of employee's satisfaction to their firm, by group based demographic aspects(male and female : 2 groups, ages : 3 group, employment period : 3 groups), for a insurance claim adjuster company As a result, it is found that the psychological factor has the statically significant determinant in all the 8 groups, with biggest positive coefficient in the 7 groups. Other factors, such as the organizational factor, the individual factor and spatial factor are statically significant determinant depending on the groups differently.

• Magazine of the Korea Concrete Institute
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• v.6 no.4
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• pp.161-168
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• 1994

Half-P.C. slab system is the composite structural system which utilizes precast concrete for lower portion and cast in situ concrete for upper portion slab. When the composite slab using Half P.C. slab is deformed by flexural moment, horizontal shear happened at the interface between Half P.C. slab and topping concrete. To resist horizontal shear strength a scratch method has tried. To determine ultimate interface shear strength, shear stress, and shear coefficient, high and normal strength concrete are used for topping concrete. Major variables are compressive strength of topping concrete with or without shear reinforcement, quantitative roughness of the P.C. :surface and tie or untie of the stud with welded deformed wire fabric in the P.C. member. The Icross sectional area on joints is 3,200 $cm^2$ in all specimens. Test results showed that shear stress increased, as the depth of the quantitative roughness increased. The horizontal shear strength could be resisted with safe by the quantitative roughness without shear tie. A shear coefficient determinant equation is proposed such that K = 0.025918 + 0.0068894$\cdot$R – 0.000182354${\cdot}R^2$

• Journal of the Korean Geotechnical Society
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• v.26 no.5
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• pp.37-48
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• 2010

In this study, the seepage flow monitoring method by the hydraulic head loss rate was developed for the purpose of application to offshore construction site enclosed by cofferdams in which seepage force varies periodically. The amount of the hydraulic head loss rate newly defined in this graph was in a range between 0 and 1. The zero of the rate means the existence of flow with no seepage resistance. The 1 of the rate means no seepage flow through the ground. The closer to 1 the coefficient of determinant in the hydraulic head loss graph is, the more the ground through which seepage water flows is stable. The closer to 0 the coefficient of determinant in the hydraulic head loss graph is, the more the ground through which seepage water flows was unstable and the higher the possibilities of existence of empty space or of occurrence of piping on the seepage flow pass in the ground is. The hydraulic head loss graph makes it possible to monitor sensitively the situation of seepage flow state, and the graph helps to understand easily the seepage flow state at the specific section on the whole cofferdam.

• Journal of Korea Water Resources Association
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• v.54 no.6
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• pp.395-405
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• 2021

When issuing forecasts and alerts for agricultural drought, the relevant ministries only rely on the observation data from the reservoirs managed by the Korea Rural Community Corporation, which creates gaps between the drought analysis results at the local (si/gun) governments and the droughts actually experienced by local residents. Closing these gaps requires detailed local geoinformation on reservoirs, which in turn requires the information on reservoirs managed by local governments across Korea. However, installing water level and flow measurement equipment at all of the reservoirs would not be reasonable in terms of operation and cost effectiveness, and an alternate approach is required to efficiently generate information. In light of the above, this study validates and calibrates the parameters of the TANK model for reservoir basins, divided them into groups based on the characteristics of different basins, and applies the grouped parameters to unmeasured local government reservoirs to estimate and assess inflow. The findings show that the average determinant coefficient and the NSE of the group using rice paddies and inclinations are 0.63 and 0.62, respectively, indicating better results compared with the basin area and effective storage factors (determinant coefficient: 0.49, NSE: 0.47). The findings indicate the possibility of utilizing the information regarding unmeasured reservoirs managed by local governments.

• Korean Journal of Remote Sensing
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• v.37 no.3
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• pp.615-625
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• 2021

The coastal areas around Palau Island and Tonga Island, near the Pacific equator, consist of coral reefs, mangrove and seaweed. In particular, understanding the optical properties of sea surface water in coral reef habitats helps improve the accuracy of remote sensing based habitat mapping and identify tropical ecosystem characteristics. Here, we collected spectral characteristics of sea surface water of Palau Island and Tonga Island and analyzed the concentration of suspended matters, absorption coefficient, and remote sensing reflectance to understand the seawater characteristics of the coral reef habitats. Based on the results of the suspended matter concentration analysis, we developed and verified an empirical algorithm to derive the concentration from satellite data using remote sensing reflectance of three bands, 555, 625, 660 nm, showed a high determinant coefficient, 0.98. In conclusion, coral reef habitats in tropical regions are characterized by CASE-I water in terms of the marine optics with oligotrophic properties, and require monitoring using continuous collection and analysis of field data.

• The Journal of the Convergence on Culture Technology
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• v.8 no.6
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• pp.861-866
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• 2022

Seoul introduced the shared bicycle system, "Seoul Public Bike" in 2015 to help reduce traffic volume and air pollution. Hence, to solve various problems according to the supply and demand of the shared bicycle system, "Seoul Public Bike," several studies are being conducted. Most of the research is a strategic "Bicycle Rearrangement" in regard to the imbalance between supply and demand. Moreover, most of these studies predict demand by grouping features such as weather or season. In previous studies, demand was predicted by time-series-analysis. However, recently, studies that predict demand using deep learning or machine learning are emerging. In this paper, we can show that demand prediction can be made a little better by discovering new features or ordering the importance of various features based on well-known feature-patterns. In this study, by ordering the selection of new features or the importance of the features, a better coefficient of determination can be obtained even if the well-known deep learning or machine learning or time-series-analysis is exploited as it is. Therefore, we could be a better one for demand prediction.

• The Journal of Asian Finance, Economics and Business
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• v.9 no.4
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• pp.287-298
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• 2022

Indonesia is an agrarian country with the significant development of Shariah banking. This study aimed to estimate the effect of Third Party Funds (TPF), Non-Performing Financing (NPF), Exchange Rates (ER), and Bank Indonesia Shariah Certificates (SBIS) on the Sharia Agriculture Sector Financing in Indonesia during 2014-2020. This study used the Ordinary Least Square (OLS) technique to analyze the data. The coefficient of determination test showed that 99.19% of Sharia financing in the agricultural sector was influenced by TPF, NPF, Exchange Rate, and SBIS variables. The estimation results showed that the variables of TPF and ER significantly affected Sharia Financing for Agricultural Sector (PP). Meanwhile, the NPF and SBIS variables had no significant effect on PP. This research showed the resilience and accuracy of Islamic banking in selecting financing and can support the development of other Islamic financial instruments such as SBIS. Simultaneous test results demonstrated the existence of the estimating model. Because of the character of the Indonesian nation as an agricultural country, this study advised Sharia banking to prioritize the usage of third-party funds from the public for the agricultural industry. Sharia banking also needed to produce Islamic finance products that fit the agriculture business sector's needs.

• Research in Community and Public Health Nursing
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• v.9 no.1
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• pp.21-29
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• 1998

This study was undertaken in order to examine the relationship of hardiness and health-promoting behavior and the effects of hardiness on stress-related physical symptoms. The subjects were 104 female nursing students of one college in Kongju. The instruments used for this study were a survey of general characteristics, hardiness(25 items), health-promoting behavior(44 items), and physical symptoms(35 items), Analysis of data was done by use of mean, Pearson correlation coefficient, stepwise regression and a hierarchical multiple regression with an SAS program. The results of this study are as follows. 1) Significant correlations between health -promoting behavior and subscales of hardiness, that is, control(r=-.35, P<.00l), commitment(r= -.29, P<.0l), and challenge(r= -.23, p<.05) were found. 2) Control was the highest factor predicting health -promoting behavior. 3) Main and buffering effects of hardiness on current physical symptoms were not found.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.12
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• pp.2647-2655
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• 2002

This research presents an analytical model to investigate the stability due to the ball bearing waviness i n a rotating system supported by two ball bearings. The stiffness of a ball bearing changes periodically due to the waviness in the rolling elements as the rotor rotates, and it can be calculated by differentiating the nonlinear contact forces. The linearized equations of motion can be represented as a parametrically excited system in the form of Mathieu's equation, because the stiffness coefficients have time -varying components due to the waviness. Their solution can be assumed as a Fourier series expansion so that the equations of motion can be rewritten as the simultaneous algebraic equations with respect to the Fourier coefficients. Then, stability can be determined by solving the Hill's infinite determinant of these algebraic equations. The validity of this research is proved by comparing the stability chart with the time responses of the vibration model suggested by prior researches. This research shows that the waviness in the rolling elements of a ball bearing generates the time-varying component of the stiffness coefficient, whose frequency is called the frequency of the parametric excitation. It also shows that the instability takes place from the positions in which the ratio of the natural frequency to the frequency of the parametric excitation corresponds to i/2 (i=1,2,3..).