• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.3
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• pp.282-291
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• 2011

Adaptive modulation(AM) is an important technique to increase the system efficiency, in which transmitter selects the most suitable modulation mode adaptively according to channel state in the temporary and spatially varying communication environment. Fixed modulation on channels with varying signal-to-noise ratio(SNR) is that the bit-errorrate(BER) probability performance is changing with the channel quality. An adaptive modulation scheme can be designed to have a BER which is constant for all channel SNRs. The correct as well as fast and simple SNR estimation is required essentially for this adaptive modulation. In order to operate adaptive modulation system effectively, in this paper, we analyze the effect of SNR estimation performance to it through the average BER and data throughput. Applying SNR estimation based on auto-correlation of decision feedback signal and others to adaptive modulation system, we also confirm performance degradation or improvement of its which is decided by SNR estimation error at each transition point of modulation level. Since SNR estimation based on auto-correlation of decision feedback signal shows stable estimation performance for various quadrature amplitude modulation(QAM) comparatively, this can be reduced degradation than others at each transition point of modulation level.

• Journal of Internet of Things and Convergence
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• v.10 no.4
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• pp.77-88
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• 2024

This study aims to identify the degree of the major selection motivation, self-efficacy, resilience, social support, academic stress, and college life adjustment of nursing students who experienced the COVID-19 pandemic, and to identify the correlations between variables and factors affecting college life adjustment. The data of this study was collected from May 14, 2024 to June 20, 2024 through a Google online questionnaire targeting 182 nursing students in Seoul and the metropolitan area and descriptive statistics, Student's t-test, one-way ANOVA, Pearson's Correlation, and linear multiple regression were conducted using SPSS Statistics 25.0. The results of the difference analysis by general characteristics showed that there was a significant difference in college life adjustment by age (F=10.602, p=.000) and grade (t=-2.334, p=.021). College life adjustment showed a significant positive (+) correlation with major selection motivation (r=.581, p<.010), self-efficacy (r=.551, p<.010), resilience (r=.699, p<.010), and social support (r=.557, p<.010), but a significant negative (-) correlation with academic stress (r=-.495, p<.010). The variables that affected college life adjustment were identified as resilience (𝛽=.366, p<.01), academic stress (𝛽=-.183, p<.05), motivation for choosing a major (𝛽=.168, p<.05), and age (𝛽=.117, p<.05), and the explanatory power for college life adjustment was 56.7%. The finding of this study can be used as basic data for developing strategies to enhanced the college life adjustment of nursing students.

• The Journal of the Korea Contents Association
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• v.20 no.8
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• pp.559-571
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• 2020

This study was conducted to analyze the effects of person-environment fit on the job performance in the National Assembly legislative support organization. Job performance was classified into task performance, contextual performance, and adaptive performance. Impacts of each factors on the job performance were identified through structural equation model. From the results of analysis, it was confirmed that supplementary fit of officials of legislative support organization of the National Assembly had a positive effect on task performance, contextual performance, and adaptive performance. However, complementary-fit does not directly affect task performance, contextual performance, and adaptive performance. Rather complementary-fit affects job performance by the mediating role of variable self-efficacy. The implications of this study confirm that it is important to match between organization members and jobs in order to improve the job performance of civil servants in the legislative support organization. The necessity of introducing self-efficacy enhancement program into the education and training process of the legislative support organization was proposed.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.371-373
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• 2003

웹 문서를 분류하는 목적은 특정 주제별로 중요한 문서들을 구분하려는 것과 사용자의 선호도를 바탕으로 개인화를 하려는 것으로 나누어 볼 수 있다. 특히, 웹의 효율적인 탐색을 위해 사용자가 관심 있어 할 웹 문서를 분류하는 것은 중요하다 일반적으로 하나의 웹 문서는 특징 추출방법에 의해 문서 벡터로 표시되며 사용자의 선호여부나 주제번호를 클래스로 삼는다. 사용자가 선호도를 표시한 웹 문서를 사용하여 새로운 웹 문서의 선호 여부를 예측하기 위해 자기 구성지도(SOM)를 사용하면, 시각적으로 구조를 보여주어 데이터 사이의 관계를 효과적으로 이해할 수 있다. 그러나 SOM은 노드의 개수와 구조를 자동적으로 결정하지 못하는 단점이 있기 때문에, SOM의 장점을 활용하면서 자동적으로 구조를 결정하기 위해 구조적응 자기구성지도(SASOM)를 이용한다. 보다 나은 성능과 다양한 해석을 위해, 여러 개의 SASOM을 서로 다른 특징추출 방법을 이용하여 학습시킨 후 사용자가 주관적으로 분류기의 중요도를 결정할 수 있는 퍼지적분을 사용하여 결합하였다. UCI Syskill & Webert 데이터에 대한 실험결과 기존의 DT, MLP, naive Bayes 분류기 보다 향상된 성능을 보였다.

• Journal of Digital Convergence
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• v.16 no.1
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• pp.117-124
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• 2018

The purpose of this study was to evaluate the effects of PAIR leadership program which can make one's own for solving problems of conflicts through understanding of self and the environmental. For this, the PAIR leadership were administered in 10 sessions for 60 minutes with 16 of the adjustment soldiers and 20 of the maladjustment soldiers of the military alternative social workers. The pre-post on the behavioral change will, interpersonal efficacy and the self-regulation level were assessed. The results were as the PAIR he maladjustment soldiers group reported significantly higher score on level of the behavioral change will, interpersonal efficacy and the self-regulation. Also the adjustment soldiers reported significantly on interpersonal efficacy and the self-regulation. This results suggest that the PAIR readership program can be applied effectively for promotion of the behavioral change will, the self-regulation.

• Journal of Music and Human Behavior
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• v.6 no.1
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• pp.1-31
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• 2009

This study aims to conduct a music psychotherapy program on North Korean child defectors, who are experiencing acculturative stress, and to discover the effects of the program on the participants' acculturative stress. This study targeted four North Korean child defectors, who belonged to an H afterschool class in Seoul and performed the program in individual sessions for about 40 minutes per session, totaling 14 sessions. The research results include the following. First, after comparing the results of acculturative stress score that measured before and after the execution of the music psychotherapy program, the mean of the score was significantly decreased from 32.75 to 23 average. Furthermore, as a result of conducting a qualitative analysis of the lingual responses that the participants demonstrated in musical activity, in relation to acculturative stress, the participants were found to experience a positive change. These results imply that the music psychotherapy program offers consistent support through music to North Korean Child Defectors, who are cowering psychologically and experiencing difficulty in adaptation, and reinforces inner resources through their positive self-perception, which indicates that it can be an effective mediation in reducing their acculturative stress.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.7
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• pp.4459-4466
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• 2015

This study was conducted to identify the factors that influence nursing students' adjustment to college life. Self-report questionnaire surveys were conducted toward 333 South Korean nursing students to measure emotional intelligence, perfectionistic self-presentation, and clinical stress. Data were collected from October 20th to December 8th, 2014. The collected data were analyzed by using t-test, one way ANOVA, Pearson correlation coefficient, and multiple linear regression analysis. The results indicated that emotional intelligence, religion, perfectionistic self-presentation significantly influenced on the adjustment to college life and the explanatory power of the model was 27.2%. Based on the study results, we suggest that it is necessary to develop and apply the educational strategy to improve the emotional intelligence for the adjustment to college life.

• The Journal of the Acoustical Society of Korea
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• v.13 no.3
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• pp.16-24
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• 1994

A single channel adaptive noise canceling (ANC) technique is presented for removing effects of additive noise on the speech signal. The conventional method obtains a reference signal using the pitch estimated on a frame basis from the input speech. The proposed method, however, gets the reference signal using the delay estimated recursively on a sample by sample basis. To estimate the delay, we derive recursion formula of autocorrelation function and average magnitude difference function. The performance of the proposed method is evaluated for the speech signals distorted by the additive white Gaussian noise. Experimental results with normalized least mean square (NLMS) adaptive algorithm demonstrate that the proposed method improves the perceived speech quality quite well besides the signal-to-noise ratio.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.04a
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• pp.506-509
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• 2004

생물과 같이 외부 환경의 변화에 적응하는 능력을 갖도록 하기 위한 시스템을 다치오토마타를 사용하여 모델화하고 이들에 대하여 도태, 교배, 돌연변이 둥의 유전적 조작을 반복함 적용에 의해 유한 상태 전이 과정을 해석하고 응용할 수 있는 방법을 제안한다. 이러한 해석과 방법에 대한 모델을 기초로 자기 갱신할 수 있는 자율 오토마타와 환경에 적응할 수 있는 적응 오토마타를 실현하는 기초 단계로 적용할 수 있는 가능성을 제안한다.

• The Korean Journal of Elementary Counseling
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• v.7 no.2
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• pp.131-140
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• 2008

The purpose of this study is to develop a teacher's encouragement response and to prove its effect. In order to do so, this study includes three sub-studies. First study is to identify the categories of teacher's encouraging verbal response. second study is to examine whether a teacher's encouraging verbal response can be developed, and third study is to identify how a teacher's encouragement has an effect on school adjustment of elementary children. The results of the study are followings: First, listening, asking, supporting, accepting, and describing are established as teacher's encouraging verbal responses. Second, a teacher can develope his encouraging response through self-discipline. Third, teacher's encouragement is effective on the enhancing of children's school adjustment.