• The Journal of the Acoustical Society of Korea
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• v.19 no.7
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• pp.3-6
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• 2000

Because the generally reported radiation impedance has been calculated for vibrating surface with infinite baffle, the results have difficulties to apply for design of the real transducers with finite baffle. In this paper, with assuming a vibrating surface as a set of small point sources, a new calculation method for the vibrating surface with finite baffle is suggested by considering the effect of finite baffle on the source strength of each point source. As an example, the variation of self-radiation impedance for rectangular vibrating surface is calculated according to the size of baffle. The results show that the suggested method is useful.

• Water for future
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• v.9 no.1
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• pp.101-105
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• 1976

This Study is developed in order to determine the probability of a raintall depth of short duration in Seoul as considering the profect life and the factor of safety of hydraulic structures. The raw annual maximum rainfall data are selected from 1915 to 1974 about short duration (10min-120min.) in Seoul. The selected data are treated by frequency analysis, and the hypothesis that the distribution fuction of the raw data is normal Distribution is performed by chi-square test that signifcance level has 5%. With the parameters (mean and standard deviation) of the accepted distribution function, the probabilitn of a rainfall depth can be easily determined on the graph which is made on this paper.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.5 no.1
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• pp.12-27
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• 1994

Until recently there were arguments on the existence and the definition of childhood depression. In DSM-III(1980) childhood depression was accepted as the formal psychiatric disorder in childhood. As the diagnostic criteria for childhood depression is less clearly defined than those for other psychiatric disorders as well as prominent age-related variations in depression symptomatology, informations from various sources are very important in accurate diagnosis of childhood depression. Present study reviewed various assessment methods such as self-report questionnaires, interviews, behavior rating scales, structured tests and projective techniques with discussion on the merits and limitations of each method. Also several issues on the reliability and the validity of assessment techniques for childhood depression were discussed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.3 no.3
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• pp.501-507
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• 1999

At the mobile unit for adaptation the propagation environment, it is necessity to adapt very fast the weight coefficient vector of adaptive array antenna In this paper, for the BPSK and BFSK signals with S/I=2, S/N=10 subband adaptive array signal processing method to the linear array antenna using the LMS & the Kalman filter algorithm is proposed. For the 4 elements equidistance linear array antenna systems LMS and Kalman algorithms with subband adaptive instruction principles using the subband signal processing method are adopted and the computer simulation results to the constant amplitude envelope signals such as BPSK or BFSK can be seen that the convergence characteristics of directional patterns and the signal following characteristics are more fast and stable.

• Korean Journal of Psychosomatic Medicine
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• v.26 no.1
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• pp.9-18
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• 2018

Objectives : The aims of this study were to investigate the psychopathology in adolescents with internalizing disorder using the self-report version of Strengths and Difficulties Questionnaire (SDQ-SR) and the Minnesota Multiphasic Personality Inventory for adolescents (MMPI-A), and to explore the complementarity between these two inventories for diagnostic assessment. Methods : Ninety-one patients aged 13-17 were divided into two groups by clinical diagnosis, 44 with internalizing disorder and 47 comparison group with other disorders. The data of SDQ-SR and MMPI-A completed by them were analyzed for the ability to predict internalizing disorder. Results : The logistic regression analysis revealed that diagnostic predictability increased by 2.27 times with every 1 point of SDQ-SR emotional symptom score increment. Comparison of ROC curves for internalizing disorders showed that the SE and SP of SDQ-SR emotional symptom with score over 4 was 88.94 and 78.72, respectively. For A-anx of MMPI-A with score over 56, SE and SP was 77.27 and 74.47, respectively. However, combination of these scales could not enhance the predictability of diagnostic classification more than that of SDQ-SR emotional symptom alone. Conclusions : Emotional symptom scale of SDQ-SR and A-anx, A-aln, A and INTR of MMPI-A should be important subscales for diagnosing the internalizing disorder of adolescents, however, which needs to be examined further with a larger sample size including normal control group.

• Journal of Convergence Society for SMB
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• v.3 no.2
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• pp.1-8
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• 2013

This study examine the relation between small and medium firm's stability and tax avoidance. We use some financial data of small and medium IT firms in KOSDAQ during 2001 to 2009. Following previous research(Desai and Dhamapala 2006), we estimate corporate tax avoidance. And we use quick ratio and current ratio as a short-term stability and equity ratio as a long-term stability. Empirical results follows as. First, It was not significant statistically between short-term stability and corporate tax avoidance. Second, it was significant statistically between the long-term stability and corporate. As corporate tax avoidance increases, the long-term stability(equity ratio) was low. Our analysis provides the empirical evidence between long-term stability and tax avoidance. It offers implications of corporate tax avoidance to small and medium IT firms in KOSDAQ. But this results is difficult generalization because of sample limits.

• Science of Emotion and Sensibility
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• v.18 no.4
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• pp.119-128
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• 2015

The demand of reflective display devices are increasing by widespread of electronic books. In this study, the emotional and reading state for reading material of paper books, reflective display, and LCD display were compared to each other. In order to determine the consumers' sensibility of E-ink e-book the emotional assessment of three different types of books was evaluated following with readability assessment and preference experiment. These experiments controlled contents on the screen by using masks to hide hardware aspects of contents. The results of the sensibility reactions by emotional-vocabulary-experiment using semantic scale show that E-ink is closer to paper than LCD. The readability and preference questionnaire for the experimental results show that e-ink is preferred than LCD and paper was preferred or seem similar to E-ink. The conclusions shows that E-ink and paper has similar sensibility and E-ink e-book is expected to replace paper books.

• 한국벤처창업학회:학술대회논문집
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• 2017.11a
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• pp.113-116
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• 2017

본 연구는 창업지원사업의 효과성을 높이기 위해 창업지원사업의 분야 및 창업지원사업의 기대충족도와 경영성과와의 인과관계를 규명하고 창업기업의 경영성과에 영향을 미치는 요인이 무엇인지를 검증하는 것에 목적이 있다. 이에 따라 우리나라 창업지원사업의 분야별 인지도, 중요도, 만족도를 살펴보고, 이러한 인식도의 차이인 기대충족도를 비교분석하여 이에 근거한 문제점을 파악함으로서 현 시대에 맞는 발전방향을 도출하여 우리나라 창업지원사업의 발전방안들을 제시하며, 합리적이고 효과적인 정책방향을 탐색하고자한다. 조사대상은 충청남도와 충청북도의 창업보육센터에 위치하며, 중소기업창업지원법에 의해 사업을 개시하고 7년이 지나지 않은 개인사업자 및 법인 사업자로 한정하였다. 자료수집 방법은 창업보육 매니저에게 요청하여 10개의 창업보육센터를 대상으로 총 150개의 입주기업에 이메일 설문지가 발송되었고, 자기보고식 작성방법에 따라 설문회수된 123개의 설문지 중 불성실 하게 응답한 설문지 1부를 제외한 총 122개를 최종 설문지로 사용하였다. 연구를 위한 자료의 수집은 2017년 10월 10일부터 2017년 10월 25일까지 2주간 실시하였다. 본 연구를 수행하기 위해 수집된 자료는 IBM SPSS Statistics 22.0을 활용하여 분석하였다. 창업지원사업 분야별로 창업자들이 상대적으로 중요하게 생각하는 정도와 실제 만족하는 정도의 평균값과 그 차이에 대한 검정을 한 결과는 다음과 같다. 창업지원사업 중 가장 중요하게 인지하고 있는 분야는 자금지원(4.44점), 시설 공간(4.25점), 컨설팅(3.80점), 창업교육(3.76점) 순으로 나타났고, 자금지원과 시설 공간은 4점 이상의 높은 점수를 보였다. 창업지원사업의 만족도는 창업교육(3.39점), 시설 공간(3.48점), 자금지원(3.36점), 컨설팅(3.33점)순으로 나타났다. 창업지원사업의 창업교육, 시설 공간, 컨설팅, 자금지원 각각 분야의 중요도와 만족도의 차이에 대한 통계적 유의성을 검정한 결과 모든 분야에서 유의미한 차이가 있는 것으로 나타났다.

• Journal of Digital Convergence
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• v.14 no.8
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• pp.81-91
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• 2016

The purpose of this study is to identify childcare teachers' self-reported perception of child abuse and neglect, reporting procedures, and reporting experience in Korea. The total average score of knowledge in child abuse and neglect was relatively high and most childcare teachers consider child abuse and neglect as a highly serious problem. About eighty six percent daycare teachers perceived reporting legislation toward child abuse and neglect, and most teachers in the study population perceived themselves as mandatory reporters. As the Child Welfare Act included a clause on mandated reporters, childcare teachers' role in intervening in child abuse cases has become more critical. In order to increase childcare teachers' reporting, education program should be designed for childcare teachers to effectively involve them in reporting child abuse and neglect.

• Geophysics and Geophysical Exploration
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• v.25 no.1
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• pp.14-25
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• 2022

The passive surface wave method measures seismic signals from ambient noises or vibrations of natural phenomena without using an artificial source. Since passive sources are usually in lower frequencies than artificial ones being able to ensure the information on deeper geological structures, the passive surface wave method can investigate deeper geological structures. In the passive method, frequency dispersion curves are obtained after data acquisition, and the dispersion curves are analyzed by assuming 1D-layered earth, which is like the method of active surface wave survey. However, when computing dispersion curves, the passive method first obtains and analyzes coherence curves of received signals from a set of receivers based on spatial autocorrelation. In this review, we explain how passive surface wave methods measure signals, and make data processing and interpretation, before analyzing field application cases.