• Korean Journal of Child Studies
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• v.15 no.2
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• pp.55-68
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• 1994

A survey analysis of home video games was carried out for 1,018 elementary school children. Children responded to a questionnaire consisting of sociodemographic variables, degree of game participation(frequency and mean time), control behavior(eg. resting during games, lightening interior), and physical symptoms(eg. eyestrain, headache, trembling, paralyses) during and/or after playing games. Statistical analysis was done by frequency, percentile, and chitest. The results showed that many children enjoyed video games frequently and played continually, that few children did control behavior during games. Main variables related to degree of game playing and control behavior were sex, game experience, parent's education, and mother's activity. In particular, the results implied that the level of physical symptoms during and/or after game differed by lighting factors.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.11
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• pp.1347-1352
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• 2009

Magnetic force driven six degree-of-freedom active vibration isolation system is developed. The velocity sensor using an electromagnetic principle that is commonly used in the vibration control is investigated since its phase lead characteristic causes an instability problem for a low frequency vibration. A lag-type compensator is adopted to reduce the phase lead and the stability test is performed by using a Bode analysis. The performance of the AVIS is validated by comparing with the passive isolation system by using the frequency responses.

• International Commerce and Information Review
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• v.10 no.4
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• pp.3-21
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• 2008

This study analyzed the effect of degree of using online trade process services provided by e-Trade companies on the degree of user satisfaction and the online export performance in Korean small and medium-sized exporting firms(SMEs). According to the empirical survey results based on 130 sample firms, there were positive relationship among the frequency of using e-Trade companies' services, the degree of user satisfaction and the online export performance. Furthermore, the results of the moderated regression analysis showed that there were significant moderation effect of the organizational characteristics on the relationships between the degree of user satisfaction and the SMEs' online export performances. This study provides several useful implications to Korean SMEs, e-Trade companies and government policy makers.

• International Journal of Contents
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• v.18 no.1
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• pp.56-64
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• 2022

To improve the cooperation ability of emergency entities, in this research, the emergency activities model, skill contribution degree, entity-relationship strength, activity continuity, and emergency entity cooperation degree were defined. Emergency entity cooperation degree and emergency activity continuity table were constructed with emergency cases, emergency plans, and emergency drill plans, and factors were further excavated which affected them. In this paper, we focus on the factors which affect the cooperation ability of emergency entities, the relationship between the emergency cooperation ability and the number of cooperation, entity-relationship intensity, emergency activity frequency, and skill contribution of fire entities and medical entities were obtained. These data results are of great significance to decision-makers in formulating emergency rescue and emergency plans.

• Journal of Families and Better Life
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• v.9 no.2
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• pp.323-343
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• 1991

The purpose of this study is to examine the relationship among stressor(role conflict), coping strategy, and psychological well-being toward dual-career wives. For this purpose data were collected form 117 dual -career wives. The statistical methods used for data analysis were frequency distribution. percentile, Pearson's correlation and multiple regression. The results were as follows; 1)The general tendency of the stressor level of dual-career wives was slightly over the mid-point scores, 2.5 and the level of psychological well-being was relatively high. Also, the degree to which dual-career wives used coping strategies was relatively high. 2)Role conflicts were negatively related to psychological well-being. 3)Coping strategies were positively related to psychological well-being. 4)The degree of the negative influence which role conflicts had on psychological well-being was lower int he group using a high degree of coping strategies than in the group using a low degree of coping strategies.

• Journal of electromagnetic engineering and science
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• v.12 no.1
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• pp.37-44
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• 2012

This paper describes a compact and novel wireless vital sign sensor at 2.4 GHz that can detect heartbeat and respiration signals. The oscillator circuit incorporates a planar resonator, which functions as a series feedback element as well as a near-field radiator. The periodic movement of a human body during aerobic exercise could cause an input impedance variation of the radiator within near-field range. This variation results in a corresponding change in the oscillation frequency and this change has been utilized for the sensing of human vital signs. In addition, a surface acoustic wave (SAW) filter and power detector have been used to increase the system sensitivity and to transform the frequency variation into a voltage waveform. The experimental results show that the proposed sensor placed 20 mm away from a human body can detect the vital signs very accurately.

• Economic and Environmental Geology
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• v.19 no.3
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• pp.219-224
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• 1986

Spectral induced polarization (IP) responses for 20-degree dipping body are obtained by both numerical and scale models. The IP responses for the dipping body vary not only with current frequencies but also with resistivity ratios between the body and the surrounding medium. If the ion concentration related to polarizable reaction is constant, the resistivity of polarizable body depends only on the current frequency. This implies that the IP responses to the resistivity ratio are qualitatively equivalent to those to the current frequency. The numerical results with wide-range resistivity ratios, therefore, can be used as standard curves for the interpretation of spectral IP data.

• Journal of Families and Better Life
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• v.4 no.2
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• pp.119-136
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• 1986

To survey the intensities of housewives perception on savings-goods and to suggest them some guiding direction for reasonable saving behavior, a total of 392 questionaires was distributed to housewives in Seoul. The data were analyzed in terms of frequency, percentage, x2-test, F-test and Pearson's Correlation. The Results were as follows; 1) Housewives awareness degree on savings-goods scored total average marks of 37/100 which was in the relatively low level. 2) Housewives interest degree on saving-goods scored total average marks of 70/100 which was in the fairly high level. 3) The correlation between awareness and interest degree on savings-goods was very highly significant. 4) The major information source of savings-goods was from pamphlet, TV, radio and newspaper, namely, public information. 5) Housewives perception of public information on savings-goods was very weak.

• Journal of Families and Better Life
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• v.14 no.2
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• pp.201-214
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• 1996

The purpose of this study was to investigate the social-psycholigcal marital conflict contents and marital conflict degree and find out how socio-demographic variables had an effect on marital conflict. For these pourposes 265 couples in the early marriage stage in seoul were randomly selected. The data were analysed through statistical methods such as frequency percentile paired t-test F-test Scheffe-test factor analysis. The major finding of this study were as follows: First the main social-psychological marital conflict contents was the attitude or habit of life communication sexual life personality and intimacy. Second the degree of marital conflict was relatively low. Taking a look at each conflict fact wives was higher than husbands in the degree of the conflict in intimacy factor. Third among socio-demographic variables level of family income wife's education and marriage style had influences on the the marital conflict degree.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.146-153
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• 2009

One dimensional site response analysis is widely used in prediction of the ground motion that is induced by earthquake. Equivalent linear analysis is the most widely used method due to its simplicity and ease of use. However, the equivalent linear method has been known to be unreliable since it approximates the nonlinear soil behavior within the linear framework. To consider the nonlinearity of the ground at frequency domain, frequency dependent algorithms that can simulate shear strain - frequency dependency have been proposed. In this study, the results of the modified equivalent linear analysis are compared to evaluate the degree of improvement and the applicability of the modified algorithms. Results show the novel smoothed curve that is proposed by this study indicates the most stable prediction and can enhance the accuracy of the prediction.