• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.8
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• pp.1818-1826
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• 2014

Time-variant sea surface causes a forward scattering and Doppler spreading in received signal on underwater acoustic communication system. This results in time-varying amplitude, frequency and phase variation of the received signal. In such a way the channel coherence bandwidth and fading feature also change with time. Consequently, the system performance is degraded and high-speed coherent digital communication is disrupted. In this paper, quadrature phase shift keying (QPSK) performance is examined in two different sea surface conditions. The impact of sea surface scattering on performance is analyzed on basis of the channel impulse response and temporal coherence using linear frequency modulation (LFM) signal. The impulse response and the temporal coherence of the rough sea surface condition were more unstable and less than that of the calm sea surface condition, respectively. By relating these with time variant envelope, amplitude and phase of received signal, it was found that the bit error rate (BER) of QPSK are closely related to time variation of sea surface state.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.6180-6189
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• 2015

The purpose of this study is to clarify the factors that affects smartphone addiction of elementary school students. The subjects were 263 students, from 4 elementary schools located in G-city. Data were collected from July, 2014 and analyzed using SPSS 19.0 program. The prevalence of addiction risk group and non-addicted group were 16.0% and 84.0%, respectively. The variables which had statistically significant differences with smart phone addiction of general characteristics are grade, living together family, economic status, school record, motivation for usage, advantage of usage and using time (p<.05). There was pure correlation between the smartphone addiction and impulsivity (r=.496, p<.001), daily stress (r=.471, p<.001). However, perceived parental attitude (r=-.375, p<.001) and self-esteem (r=-.444, p<.001) were inverse correlation with smartphone addiction. Higher using time, higher impulsivity and higher daily stress were all associated with increased of smartphone addiction level. These results suggest that more attentions should be given to early adolescents and could be effectively used as fundamental data to develop intervention programs, which can prevent the smartphone addiction.

• The Journal of the Korea Contents Association
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• v.19 no.10
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• pp.463-471
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• 2019

This study examined the spirituality of dental hygiene and students and examined whether it affects the stress that may occur during clinical practice. The research tool consisted, clinical practice stresses, and general characteristics. It was held from March to July 2019 for 280 dental hygienists and students in K area. T-test and ANOVA were conducted for differences in spirituality and clinical practice stress according to general characteristics. The correlation between spirituality and clinical stress was analyzed by Pearson corrlation coefficients. As a result, dental hygiene and clinical practice stress of students were negatively correlated with spirituality, major satisfaction, and academic performance. If the motivation to apply to the department was grade, the clinical practice stress was higher. The limitation of this study is that it is impossible to make a concrete comparison because previous studies on the spirituality of dental hygiene and students are insufficient. Therefore, various studies on spirituality and clinical practice stress for dental hygienists are needed, and strategic search will be needed.

• The Korean Journal of Applied Statistics
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• v.24 no.2
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• pp.411-424
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• 2011

The studies of congruence in organizational research have explored the concepts such as person-job fit person-organization fit, or person-environment fit. The relevant studies dealt with the fit level as an important influencing factor on the performance. In particular, researchers have agreed that employees can be motivated by the high level fit of person-organization. However, few research developing an alternative methodological approach has been done. For the purpose mentioned above the statistics like D, |D| or $D^2$ and the Q values such as Q(the correlation between two sets of interval measures) or $Q_r$(the correlation between two rankings) have been conventionally adopted in spite of numerous methodological problems. In general, these traditional indices such as difference scores, or Q values, are nondirectional and add an extra weight to differences of lager magnitude. Therefore, Edwards (1993) introduced the polynomial regression and the response surface analysis to overcome flaws with conventional approaches. However, the method-ological approaches did not reflect the profile characteristics of person-organizational value fit and wouldn't be a proper solution for the fit level of person-organization value maximizing performance. Hence, this paper investigates alternative methodological approaches, the multivariate polynomial regression and the multiple response surface analysis, to avoid the problems issued from conventional ways.

• Korean Journal of Social Welfare Studies
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• v.44 no.2
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• pp.141-168
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• 2013

The purpose of this study is to substantially understand and identify experienced social exclusion of the disabled in Korea. For this, the 8 times in focus interview implemented on 31 of the disabled with regard to disability type, gender, age, education, job etc. The results, firstly it found that participants experienced material deprivation due to inequality on economic distributions, and the multi-deprivation of social rights overall social systems and scopes resulted from the disability discrimination against the organization of society. Nextly, it represented that they got the exclusion from social participation and isolation and alienation in social relationships in the dimension of society. In that, particularly, a sort of invisible type of social exclusion such as an intolerant and double social norm and values is found, which has been impacted on their impairment or disability in the participants. This founded results contribute on applying fundamental data for political and practical implementations for social inclusion of the disabled, as well as theoretical building for conception of social exclusion of the disabled.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.1
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• pp.546-554
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• 2018

This cross-sectional correlational study investigated factors affecting career planning of nursing students, focusing on the associations between satisfaction of academic major, perceived professional competence, and job expectations. Data from 255 nursing students were collected through self-administered questionnaire surveys on 2016 January 4 and 7 and analyzed using descriptive statistics, Pearson's correlation coefficients, t-tests, bootstrapping SPSS macro and path analysis using AMOS. There were significant correlations between major satisfaction, professional competence, and job expectations. Both major satisfaction and professional competence were significant factors influencing job expectations, but their effects on job expectations were significantly different depending on whether there was a role-model, which support a moderating effect of having a role-model. Major satisfaction had a significant direct effect on career planning, but its indirect effect on career planning through job expectations was not significant. Professional competence did not have a significant direct effect on career planning, but its indirect effect on career planning through job expectations was significant. Overall, the results highlight the importance of providing educational support and opportunities for nursing students to explore their own motivation and to have a role-model during pursuit of a nursing career.

• Journal of Korea Society of Industrial Information Systems
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• v.29 no.5
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• pp.157-171
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• 2024

Recently, empowering leadership, which leads to psychological motivation by giving members authority, responsibility, and autonomy for decision-making and instilling a sense of ownership in their work, as well as the suitability between individual members and their jobs, has been emphasized as determining the success of an organization in a rapidly changing environment. In addition, jobcrafting is attracting attention as an action that proactively readjusts the physical, cognitive, and relational scope of work by changing beliefs and attitudes toward a given task. Therefore, this study examines the structural relationship between empowering leadership, person-job fit, jobcrafting, knowledge-sharing behavior, and innovation behavior. A survey was conducted on members of travel agencies in Busan and Gyeongnam, and the results showed that first, empowering leadership had a positive (+) significant effect on jobcrafting, and person-job fit had a positive (+) significant effect on jobcrafting. Second, it was found that jobcrafting had a positive (+) significant effect on knowledge-sharing behavior and innovation behavior, and finally, knowledge-sharing behavior had a positive (+) significant effect on innovation behavior, so all hypotheses were adopted. This study shows that in order to induce knowledge-sharing behavior and innovation behavior of members, it is necessary to create an environment in which jobcrafting can take place, increasing the level of empowering leadership, person-job fit, and increasing jobcrafting.

• Korean Journal of School Psychology
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• v.18 no.1
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• pp.31-48
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• 2021

The purpose of this study was to determine whether the retention of university freshmen could be predicted using their peer relationships in a specific department. In this study, retention was defined as a student staying enrolled in their university for a certain period of time. Social relationships are formed through interaction between people, so both students' self-perceptions and others' perceptions of them must be accounted for, so we used a social network analysis that did so. We examined social networks visualizations that allowed for a rich interpretation of numerical information. Participants in this study were freshmen who enrolled in an undergraduate program in 2017, 2018, or 2019. We used the name generator method to determine how quantitative friendship network variables predicted the academic retention up to the first semester of 2020. Cox proportional hazard model analysis showed that the weighted indegree centrality with intimacy positively predicted retention. The results of this study can be used to identify and conduct interventions for students who may be likely to disenroll. However all of the students did not participate in the department, it was difficult to examine their entire peer networks. Thus, this study's results cannot be generalized because the participants are students of a specific major, so further research is needed to produce more generalizable results.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.329-337
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• 2019

This study is a descriptive research designed to determine the effects of nurses' image and major satisfaction on nursing students' career identity. For this purpose, the study made a questionnaire survey of 117 nursing students attending at K college located B city. Data collected from the survey were analyzed using SPSS 22.0 program. The findings of this study can be summarized as follows. First, participants showed significant differences in nursing students' career identity on grade and motivation of entrance. Second, there were correlations between nurses' image and nursing students' career identity and also between their major satisfaction and career identity. Third, nursing students' career identity was influenced by their relationship satisfaction between professors and students, which are sub-factors of major satisfaction, but nurses' image did not influenced their career identity. Therefore it is needed to provide nursing students with educational and interventive programs that help their better their relationship satisfaction between professors and students, continuous attention and guidance are necessary to facilitate communication and career guidance between professors and students.

• Korean Journal of School Psychology
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• v.17 no.3
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• pp.243-261
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• 2020

Fear of missing out (FoMO) refers to the desire to stay continually connected with what others are doing because they are afraid of missing the flow or not being included. Although FoMO has been recently proposed as a widespread phenomenon within social media, there has been few empirical research by which mechanism FoMO leads to social networking service (SNS) addiction. Therefore, this study examined whether FoMO mediated the relationship between adolescents' attachment and SNS addiction proneness. A total of 517 middle and high school students participated in the study and completed self-report questionnaires. Results showed that FoMO partially mediated the relationship between adolescents' parental attachment and SNS addiction proneness, whereas the relationship between adolescents' peer attachment and SNS addiction proneness was fully mediated by FoMO. These results suggest that unstable attachment might contribute to SNS addiction through FoMO, especially in case of peer attachment. Lastly, we discussed theoretical and practical implications of this study and suggestions for future research.