• The Journal of Korean Institute of Communications and Information Sciences
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• v.37A no.9
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• pp.762-771
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• 2012

In this paper, we propose an adaptive power control scheme employing a self-optimization concept in femtocell systems, in order to improve system capacity, thereby reducing call-drop probability. In the proposed scheme, each femto base station(FBS) controls individual channel's transmission power base on two parameters; the neighboring cell's transmission power for each individual channel which is delivered from a femto-gateway and the received power strength from neighboring cells which is periodically measured by means of a spectrum sensing. Adaptive adjustment of individual channel's transmission power in accordance with femto mobile station(FMS) mobility features can also reduce undesirable handovers and evenly distribute traffic load over all femtocells. In addition, the manipulative control of channel's transmission power is able to keep the system coverage and the call-drop probability within an acceptable range, regardless of density of femtocells. Computer simulation shows that the proposed scheme outperforms existing schemes in terms of the system coverage and the call-drop probability.

• Korean Journal of School Psychology
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• v.8 no.3
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• pp.379-403
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• 2011

This study examined coping strategies and perceived changes of the Chinese international students in South Korea. A total of 56 Chinese students participated and data was analyzed using the concept mapping method. The results showed that Chinese international students adopted developing language proficiency and using social networks as important coping strategies. They also perceived a wide range of changes including changes in the cultural and personal self. However, the perception of these coping strategies and changes differed by the length of stay. Chinese international students who stayed longer reported using specific coping strategies for mood regulation, which was distinctive from the coping strategies used by students who stayed for a shorter period of time. Students who stayed longer perceived negative changes as well as positive changes, while students who stayed for a shorter period reported predominantly positive changes. The findings indicate that university staff needs to understand and sensitively respond to the distinctive experiences of Chinese international students which vary across time.

• 대한공업교육학회지
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• v.43 no.1
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• pp.41-57
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• 2018

The purpose of this study is to help research and application about effective strategies to improve school adjustment of students by investigating the influence of specialized vocational high school students' emotional intelligence on school adjustment. A survey was conducted to 760 engineering major students at the vocational high schools from 18 vocational high schools of 5 major metroplex. A questionnaire consists of measurement tool for emotional intelligence (40 questions) and one for school adjustment (20 questions). The findings of this study are as follows: First, students with high emotional intelligence showed a higher level of school adjustment than students with lower emotional intelligence, and they also has a higher standard in all sub factors of school adjustment, Second, it is found that the explanatory power of emotional intelligence on school adjustment is 33.6%. It means the higher the emotional intelligence of the students, the higher the school adjustment, so it can be seen that emotional intelligence might be one alternative that increases school adjustment for specialized vocational high school students. Furthermore, emotional intelligence shows the greatest explanatory power to peer relationship in school adjustment sub factors. This is showed that students with high emotional intelligence have good peer relationship than students with lower emotional intelligence relatively. Also, it can be known that school adjustment is high because the better peer relationship is, the higher self-efficacy, class immersion, resilience and so on are.

• Korean Journal of Culture and Social Issue
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• v.16 no.2
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• pp.125-146
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• 2010

A total of 181 college students(61 males 121 females) with at least 5 years of living abroad (Returnee Group) and another group of 181 students (92 males and 93 females) without extended period of living abroad (Comparison Group) participated in the study by completing a questionnaire consisting of Acculturation Index, Multidimensional Acculturation Scale, Student Adaptation to College Questionnaire, Revised UCLA Loneliness Scale, CES-D, and WHOQOL. The results indicated that the Returnee Group, compared to the Comparison Group, reported as good adjustment toward college life in Korea and positive attitude toward the Korean identity, but a higher level of loneliness. When the Returnee Group were divided into 4 different groups on the basis of acculturation pattern, the Integration and Assimilation Type reported a better adjustment to college life, lower depression and loneliness and better quality of life than the Marginalization Type. The Mariginalization Type appears to be the most vulnerable group, experiencing difficulties in all areas of adjustment, and is clearly in need of interventions. Limitations of the present study and suggestions for future research were discussed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.7B
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• pp.1034-1042
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• 2010

As many researchers have been interested in Green IT, Energy Efficient Ethernet(EEE) with rate adaptation has recently begun to receive many attention. However, the rate adaptation scheme can have different energy efficiency and delay according to the characteristics of various traffic patterns. Therefore, in this paper, we analyze the impact of different traffic patterns on the energy efficiency and delay in Ethernet with rate adaptation. To do this, firstly we design a rate adaptation simulator which consists of Poisson based traffic generator, Pareto distribution based ON-OFF generator and Ethernet node with rate adaptation by using OPNET Modeler. Using this simulator, we perform the simulation in view of the total number of switching, transmission rate reduction, energy saving ratio and average queueing delay. Simulation results show that IP traffic patterns with high self-similarity affect the number of switching, rate reduction and energy saving ratio. Additionally, the transition overhead is caused due to the high self-similar traffic.

• Journal of Digital Convergence
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• v.15 no.5
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• pp.401-409
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• 2017

The purpose of this study was to identify the relationship of self-esteem, self-efficacy and ego-resilience of nursing students and to evaluate the effect of self-esteem and self-efficacy to ego-resilience. In this study, 247 data was collected from nursing students of G-city in South Korea from Sep. 2016 to Nov. 2016, and the collected data was analyzed with SPSS 22.0 Statistics Program. The result showed that self-esteem had positive correlation with both of self-efficacy and ego-resilience, and self-efficacy had positive correlation with self-efficacy. Both of self-esteem and self-efficacy were significant to ego-resilience with the explanation power of 59.2%. It is necessary for nursing students to improve their self-esteem and self-efficacy from college education to cope and adapt to various stress situations experienced in the clinical field, and it is required to develop the ego-resilience improvement program using self-esteem and self-efficacy.

• Journal of the Korean Society of Radiology
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• v.84 no.2
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• pp.345-360
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• 2023

In Korea, the number of institutions providing breast MRI, as well as the number of breast MRIs, has recently increased. However, MRI-guided procedures, including biopsy and needle localization, are rarely performed compared to ultrasound-guided or stereotactic biopsy. As breast MRI has high sensitivity but limited specificity, lesions detected only on MRI require pathologic confirmation through MRI-guided biopsy or surgical excision with MRI-guided needle localization. Thus, we aimed to review MRI-guided procedures, including their indications, techniques, procedural considerations, and limitations.

• The Journal of the Korea Contents Association
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• v.17 no.3
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• pp.633-642
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• 2017

The purpose of this study was to examine the effectiveness that group counselling by transactional analysis influence on personal competence and communication for maladaptive soldier. 8 participants were assigned to an experimental group and pre and post test was performed. Experimental group were given group counselling program by Transactional Analysis(TA) sessions during 4day, which one session offered for 240 minutes' 8 hour a day. To verify the effectiveness of the group counselling Wilcoxon Matched-Pairs Signed-Ranks Test was performed. The result revealed that group counselling by transactional analysis positively influence on personal competence(self-efficacy, positive character) for maladaptive soldier. This study has a meaning and great achievements to present the possibility of using this program in practical and clinical field, which significant improvement in personal competence, self-efficacy, positive character.

• Journal of the Korea Convergence Society
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• v.11 no.2
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• pp.323-330
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• 2020

This study is to identify the types and meaning of 'Good Leisure' that married immigrant women perceived. 32 Q samples were extracted from the interviews and questions and 40 immigrant women were selected as P samples. The conclusion are as follows; First, the types of 'Good Leisure' were classified as 4 types. Second, the type 1, 'Psychological Stability Pursue Type' recognizes 'Good Leisure' when they feel comfort and relaxed through activities. The type 2, 'Emotional Stability and Self-development Type' recognized 'Good Leisure' when they are pleased, or engaged in self-development activities. The type 3, 'Practical Use Pursue and Information Acquisition Type', recognizes 'Good Leisure' when they learn things necessary for living with less cost, and type 4, 'Acculturation and Exchange Type' recognizes 'Good Leisure' when they learn Korean culture or interact with Korean people. Third, regardless of each type, married immigrant women perceived in having a good time with people as 'Good Leisure'.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.1
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• pp.28-35
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• 2014

In this paper, we propose a SSD(simultaneous single band duplex) system with turbo equalizer for full-duplex over harsh ISI(inter symbol interference) channel. The proposed system uses RF(radio frequency) cancellation and digital cancellation to cancel self-interference caused by simultaneous single band duplex communication. Also, using turbo equalizer, the proposed system equalizes signal after digital cancellation. In this paper, we design SSD system with turbo equalizer. And then we evaluate BER(bit error rate) performance of the proposed system comparison with SSD system with adaptive equalizer. We use simulink program to confirm BER performance of the proposed system. The simulation results shows that the proposed system equalizes received signal effectively over harsh ISI channel and BER performance of the proposed system is better than BER performance of SSD system with adaptive equalizer.