• Korean Journal of Child Studies
• /
• v.37 no.1
• /
• pp.61-71
• /
• 2016

Objective: The purpose of this study was to confirm if there are gender differences in influences of parental support, control, and school life adjustment on suicidal ideation of adolescents and to examine the mediating effect of depression on the influences of independent variables on their suicidal ideation. Methods: This study comprised a total of 671 students in seventh and eighth grades in Seoul and Gyeonggi-do. The data were analyzed for frequency, average, and standard deviation, using the t-test, Pearson's correlation analysis, stepwise regression analysis, hierarchical multiple regression analysis, and the Sobel test. Results and Conclusion: First, significant differences among adolescents' gender were shown in fathers' psychological control, mothers' behavior control, and suicidal ideation. Second, in the case of male adolescents, all independent variables were found to have a full mediating effect on their suicidal ideation. Meanwhile, in the case of female adolescents, independent variables except for mothers' psychological control were found to have a full mediating effect on their suicidal ideation. Mothers' psychological control was found to have a partial mediating effect on suicidal ideation of adolescents for both genders.

• Proceedings of the IEEK Conference
• /
• 2006.06a
• /
• pp.635-636
• /
• 2006

A self-biased CMOS current reference is described which provides supply and temperature independent bias current. The supply independency is obtained by subtracting two bias currents which have the same supply dependency. Unlike the conventional self-bias CMOS current reference, excellent supply independency can be obtained even with the minimum channel length devices and thus smaller area implementation becomes possible. The supply independent bias current is then applied to a temperature compensating circuit and as a result supply and temperature independent bias current is obtained. The current reference has been implemented in a $0.25{\mu}m$ standard CMOS technology. The active silicon area is only $45{\mu}m{\times}45{\mu}m$. The simulated temperature coefficient is 64ppm/$^{\circ}C$ in temperature range between $0^{\circ}C$ and $120^{\circ}C$. Supply voltage can be as low as 1.3V and the supply dependency of the current reference is measured to be smaller than 4500ppm/V. While providing $10.25{\mu}A$ output current, the current reference consumes $160{\mu}W$.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.30 no.6C
• /
• pp.475-480
• /
• 2005

Information of the maximum Doppler frequency enable to optimize many channel-adaptive techniques and radio resource management methods for mobile radio communication systems. In this paper, we propose two maximum Doppler frequency estimators which are based on the level crossing rate(LCR) and the covariance function (COV). To eliminate the effect of additive noise, we analyze the conditions for the estimators independent of the signal-to-noise ratio(SNR) and implement the conditions with a simple downsampling process. The proposed methods achieve good SNR-independent performance.

• The Journal of Information Systems
• /
• v.21 no.1
• /
• pp.19-46
• /
• 2012

This paper classifies the success factors of collaboration system in the shipbuilding industry. We propose the structural model that identifies the relationship between the success factors and organizational performance. To test empirically the relationship between the factors, we developed the measurement of each factors. This paper has examined the relationship between the independent variables and the mediating variables, also has examined the relationship between the parameters and a final dependent variable. The independent variables are as follows, (1) quality of system including reliability, flexibility, and accessibility, (2) the quality of information including contents, expressiveness, and (3) the partner relationship including the information sharing and the compatibility of strategies. The mediating variables are user involvement, parter trust, and user satisfaction. The final dependent variable is business performance. The hypotheses test proved that the system quality significantly affect user satisfaction, the information quality positively influence on the user participation, and the information sharing and strategic fit of partner relationship positively affect partner trust. Also, the user participation and partner trust significantly affect user satisfaction. Finally, the user participation, user satisfaction, and partner trust have a decisive effect on the organizational performance. The results of hypothesis test verified that the quality of information and system, also partner relationship are important to operate successfully the collaboration system in the shipbuilding industry. Also, the mediating variables are important to explain the structural relationship between the independent variables and organizational performance.

• Korean Journal of Child Studies
• /
• v.34 no.3
• /
• pp.59-74
• /
• 2013

The main purpose of this study was to explore the moderating effects of fathers' current psychological well-being in the relationships between fathers' experienced parenting from the family of origin and their parenting attitudes to their children. The subjects themselves consisted of 370 fifth-and sixth-grade children and their fathers from elementary schools in Seoul and Daegu. Questionnaires containing items related to experienced parenting and the current psychological well-being reported by fathers and fathers' parenting attitudes reported by their children were used. Regression analyses revealed that a fathers' 'independent encouraging' attitude to their children was predicted by a fathers' psychological well-being whereas a fathers' 'acceptance' attitudes was predicted by both a fathers' experienced 'acceptance' parenting and their psychological well-being. Further, a fathers' psychological well-being played a moderate role in the relationship between fathers' experienced 'independent encouraging' parenting from the family of origin and their 'independent encouraging' attitude to their children.

• Communications for Statistical Applications and Methods
• /
• v.26 no.3
• /
• pp.261-272
• /
• 2019

In this paper, we propose a procedure to build a prediction interval of the sum of dependent binary random variables over a graph to account for the dependence among binary variables. Our main interest is to find a prediction interval of the weighted sum of dependent binary random variables indexed by a graph. This problem is motivated by the prediction problem of various elections including Korean National Assembly and US presidential election. Traditional and popular approaches to construct the prediction interval of the seats won by major parties are normal approximation by the CLT and Monte Carlo method by generating many independent Bernoulli random variables assuming that those binary random variables are independent and the success probabilities are known constants. However, in practice, the survey results (also the exit polls) on the election are random and hardly independent to each other. They are more often spatially correlated random variables. To take this into account, we suggest a spatial auto-regressive (AR) model for the surveyed success probabilities, and propose a residual based bootstrap procedure to construct the prediction interval of the sum of the binary outcomes. Finally, we apply the procedure to building the prediction intervals of the number of legislative seats won by each party from the exit poll data in the $19^{th}$ and $20^{th}$ Korea National Assembly elections.

• Human Ecology Research
• /
• v.59 no.4
• /
• pp.433-448
• /
• 2021

The purpose of this study was to analyze two subject competencies (practical problem-solving capability and independent life capability) reflected in the activity tasks included in the 'home life and safety' area of 12 middle school technology-home economics textbooks in accordance with the 2015 revised curriculum. The analysis criteria were sub-elements of two subject competencies. Seven sub-elements were derived from each competency. Frequency analysis was performed to determine how often the sub-elements were reflected in the activity tasks. The results were as follows. First, with regard to the sub-elements of 'practical problem-solving capability', 'value judgment' was reflected most frequently in the activity tasks followed by 'exemplification of solution', 'logical thinking', 'critical thinking', 'decision-making', 'practical reasoning', and 'evaluation of solutions'. Secondly, the sub-elements of 'independent life capability' were unevenly distributed in the activity tasks. The 'capability to perform conscious living' was reflected most frequently followed by 'development and self-identity', 'time, money, and leisure management', and 'reasonable consumption and resource utilization'. For teachers wanting to teach activity-oriented classes and student participatory classes, the results pinpoint the materials necessary to develop learners' subject competencies by using textbooks from different publishing companies.

• Communications for Statistical Applications and Methods
• /
• v.31 no.4
• /
• pp.409-425
• /
• 2024

Logistic regression models are commonly used to explain binary health outcome variable using independent variables such as patient characteristics in medical science and public health research. Although there is no distributional assumption required for independent variables in logistic regression, variables with severely right-skewed distribution such as lab values are often log-transformed to achieve symmetry or approximate normality. However, lab values often have zeros due to limit of detection which makes it impossible to apply log-transformation. Therefore, preprocessing to handle zeros in the observation before log-transformation is necessary. In this study, five methods that remove zeros (shift by 1, shift by half of the smallest nonzero, shift by square root of the smallest nonzero, replace zeros with half of the smallest nonzero, replace zeros with the square root of the smallest nonzero) are investigated in logistic regression setting. To evaluate performances of these methods, we performed a simulation study based on randomly generated data from log-normal distribution and logistic regression model. Shift by 1 method has the worst performance, and overall shift by half of the smallest nonzero method, replace zeros with half of the smallest nonzero method, and replace zeros with the square root of the smallest nonzero method showed comparable and stable performances.

• Journal of the Korean Society for Library and Information Science
• /
• v.30 no.1
• /
• pp.69-88
• /
• 1996

This dissertation evaluate3 the Sulmunhaejaikjing, published in 1912, by Sun-Soo Park, an ideographic scholar of the late on Korean Chosun Dynasty. This study first explores the compilation, structure andmethodology of the Chinese written characters in Sulmunhaejaikjing. Second, it studies the Sulmunhaejaikjing's distinctive features by means of a comparison with some works of Sulmunhak of the Chung Period in China. Since the motivation of writing of his work was to correct the errors of Sulmunhaeja, Sun-Soo Park attempted several independent interpretations. The interpretive stucture of Sulmunhaejaikjing exactly follows the 14 Books and 540 Parts of Sulmunhaeja, but Park's work differs in interpretation methodology and content Huh Shin made Sojun characters the subject of the investigation, Sun-Soo Park corrected Huh Shin's errors by making the Pre-Sojun older Chinese characters the object of his investigation. Sulmunhaejaju by Tan Ok-Jae, the most distinguished work of spoken literature in the Chung period, adopted Huh Shin's interpretation and added notes, sothat. Tan Ok-Jae, like Huh Shit did not take into account the Pre-Sojun old Chinese character. Therefore, Sun-Soo Park's interpretation greatly differ from Tan Ok-Jae's. Among the scholars of Sulmunhak in the Chung Dynasty, it is Oh Dae-Jing, the writer of Sulmunhaejubo, that accomplished the most noticeable achievement in Sulmunhaeja, Oh Dae-Jing aimed to collect all the Chinese characters which were confirmable in the interpretation of Sulmunhaeja. This, Oh Dae-Jing in a nut neglected the independent interpretation of characters. Sun Soo Park however, demonstrated a pregressive character in basing his independent interpretation upon reliable resesources, even though he offered fewer character in number than did Oh Dae-Jing.

• Environmental and Resource Economics Review
• /
• v.21 no.3
• /
• pp.441-464
• /
• 2012

As prices of energy resources such as oil and gas started to rise steadily in 2000, energy security has been one of the most important topics in the world. To secure more energy, most of countries which are highly dependent on imported energy resources try to occupy oversea oil or gas reserves, thereby intensifying competition for energy resources around world. Under this circumstance, we focus on independent E&P companies since they are relatively small size companies which are suitable for M&A. We analyze investment option values for these E&P companies using a real option model for depletable resources. Based on analytical model, empirical study is provided to examine rationality of investment for energy companies. The result shows sufficient profitability for independent E&P companies in both oil and gas projects in the North America during 2004 to 2008. In Particular, oil projects were more feasible than gas project due to lower price of gas and high volatility of gas price at that time.