• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.67-72
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• 2006

Questionnaire survey on performance requirement of ship’s speed such as not only accuracy but also response and robustness were carried out, and the experiments to survey the GPS performances of static and dynamic characteristics were carried out simultaneously. In this paper, the questionnaire survey focusing on docking maneuvering, some analytic results of the survey, the results of GPS performance, and the possibility of adaptation for docking maneuvering on SDME and GPS are discussed. Consequently, from the results of questionnaire survey the performance requirement of ship’s speed in docking/anchoring maneuvering have need under 1cm/sec on the standard deviation, and speed information from GPS was adopted to use maneuvering information in docking/anchoring.

• 대한물리의학회지
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• 제4권4호
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• pp.241-247
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• 2009

Purpose：The purpose of this study is to investigate the effect of transcutaneous electrical stimulation on autonomic nervous system using heart rate variability analysis. Methods：31 subjects were evaluated with HRV before and after a single high-frequency TENS for 15minutes treatment. The standard deviation of all the normal RR-interval(SDNN) and lower frequency/high frequency ratio(LF/HF ratio) were recorded with TAS-9. Results：After single TENS treatment, autonomic adaptation as analyzed by SDNN was increased from $42.47\pm12.96$ to $4.43\pm16.76$(p>0.05) and autonomic balance as analyzed by LF/HF ratio was increased from $1.4\pm0.45$ to $1.45\pm0.41$(p>0.05). Conclusion：In this study, SDNN and LF/HF ratio changed in health young students as a result of single TENS treatment. But there is no significant difference between pre-treatment and post-treatment of SDNN and LF/HF ratio.

• 한국군사과학기술학회지
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• 제10권1호
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• pp.5-13
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• 2007

The trajectory of an current artillery munition is subject to a variety of different error sources resulting in more or less big deviation from the nominal predicted flight path. The 1D CCM(Course Correction Munition) has appeared to solve this problem and the mechanism of 1D CCM is a simple and low cost one using the influence of drag to range behavior of an artillery munition. In the paper 1D CCM concept has been simulated using wind tunnel experiment results of the specified Korean munition with CCF(Course Correction Fuze) and calculated the performance of its rang error reduction. From the simulated results it can be numerically explained that the possibility of adaptation of 1D CCM concept to Korean artillery munitions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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• pp.351-354
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• 1987

In this paper, an adaptive control scheme is applied to the speed control system of a synchronous AC servo motor. The adaptive control system using Ioannou's modified adaptation law is shown to be robustly stable in the presence of current control error and load torque disturbance. The computer simulation demonstrates the rapid compensation of rotor speed deviation due to load torque disturbance.

• 문화기술의 융합
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• 제9권2호
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• pp.99-104
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• 2023

본 연구는 목적은 아동의 학업 스트레스가 학교 적응에 미치는 영향을 살펴보고, 학업 스트레스와 학교 적응 간의 관계에서 자아탄력성이 매개 역할을 하는지 검증해 보고자 하였다. 한국아동패널 12차년도(2019년) 자료를 토대로 기초통계분석으로 주요대상자의 일반적 특성, 주요변인의 평균, 표준편차, 왜도 및 첨도를 확인하였고 변인 간 상관분석을 실시하였다. 또한 학업 스트레스가 학교 적응에 미치는 영향에서 자아탄력성이 매개하는지 살펴보기 위해 Baron과 Kenny의 절차를 따라 3단계 걸친 회귀분석을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 아동의 학업 스트레스, 학교적응, 자아탄력성은 모두 유의미한 상관이 있는 것으로 나타났다. 학업 스트레스가 높을수록 자아탄력성과 학교적응력이 낮아졌다는 것을 의미한다. 둘째, 아동의 학업 스트레스와 학교적응 간의 관계에서 자아탄력성은 부분 매개 효과가 있는 것으로 확인 되었다. 학업 스트레스 상황에서 자아탄력성은 스트레스 상황을 객관적으로 파악하고 잘 대처하게 해 줌으로써 학교생활에 유연하게 적응해 나가게 하는 중요한 매개변인으로 작용한다는 것을 의미한다. 이에 우리는 아동이 학업 스트레스를 줄이고 학교생활에 잘 적응할 수 있도록 융통성 있는 탄력적인 개인의 특성이 필요함을 인식하고 적극적인 관심과 개입방안 마련을 모색할 필요가 있겠다.

• 한국산학기술학회논문지
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• 제21권7호
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• pp.120-126
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• 2020

본 연구는 간호대학생의 자기효능감, 스트레스 대처 및 대학생활적응과의 관계를 알아보기 위한 서술적 조사연구이다. 본 연구대상자는 K도에 소재하는 4년제 간호대학의 학생을 대상으로 편의 추출하였으며, 자료 수집은 2018년 10월 1일부터 12월 10일까지 실시되었다. 자료분석은 SPSS 22.0 프로그램을 이용하였으며, 빈도와 백분율, 평균과 표준편차, Pearson's correlation, t-test, ANOVA, Multiple regression을 이용하였다. 본 연구결과 간호대학생의 자기효능감은 3.07±.39점, 스트레스 대처 2.15±.24점, 대학생활적응 3.32±.49점으로 나타났으며, 변수들 간에는 유의한 상관관계가 있는 것으로 분석되었다. 연구대상자의 자기효능감과 스트레스 대처가 높을수록 대학생활적응이 높은 것으로 나타났다. 또한 일반적 특성에서 전공 만족과 학과 지원동기, 음주에 따라 유의한 차이가 있었다. 대학생활 적응력은 전공 만족이 높을수록, 지원동기가 확고한 편이 보통인 경우보다, 대인관계에서 음주를 하는 경우가 높았다. 이상의 연구결과를 보아 성공적 대학생몰 및 스트레스에 대처능력 강화를 위한 지원프로그램 개발이 요구된다.

• The Journal of Advanced Prosthodontics
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• 제7권3호
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• pp.199-206
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• 2015

PURPOSE. The present study investigated the influences of various gypsum materials on the precision of fit of CAD/CAM-fabricated prostheses and analyzed their correlation with surface roughness. MATERIALS AND METHODS. The master model of the mandibular right first molar was replicated, and four experimental groups based on two types of Type IV stone (GC Fujirock EP, Die keen) and two types of scannable stone (Aesthetic-Basegold, Everest Rock) were created to include a total of 40 specimens, 10 in each group. The surface roughness of the working models for the respective experimental groups was measured. Once the zirconia cores had been fabricated, the marginal and internal fits were measured with a digital microscope using the silicone replica technique. The mean and standard deviation of the respective points of measurement were computed and analyzed through the one-way ANOVA and Tukey's HSD test. The correlation between surface roughness and the precision of fit of the zirconia core was analyzed using the Pearson correlation analysis (${\alpha}$=.05). RESULTS. The zirconia cores fabricated from the scannable stone working models exhibited a superior precision of fit as compared to those fabricated from the Type IV stone working models. The correlation analysis results showed a clear positive correlation between surface roughness and the precision of fit of zirconia cores in all of the experimental groups (P<.05). CONCLUSION. The results confirmed that the surface roughness of dental working models has a decisive influence on the precision of fit of zirconia cores.

• 응용통계연구
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• 제35권6호
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• pp.703-724
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• 2022

다변량 경시적 자료 분석은 반복 측정된 자료에 존재하는 상관관계를 올바르게 추정하면서 자료를 분석해야 한다. 경시적 연구에서는 다변량 경시적 자료가 주로 생성되지만, 기존 통계적 모형은 대부분 단변량으로 분석되어 다변량 경시적 자료에 존재하는 복잡한 상관관계를 제대로 설명하지 못하게 된다. 따라서 본 논문에서는 복잡한 상관관계를 설명하기 위해 공분산 행렬을 모형화하는 다양한 방법에 대해 고찰한다. 그 중 수정된 콜레스키 분해, 수정된 콜레스키 블록분해와 초구분해를 살펴본다. 그리고 일반화 자기회귀모수 행렬이 가지는 희박성 문제를 해결하기 위해 베이지안 방법을 이용하여 청소년 패널 데이터를 분석한다. 청소년 패널 데이터는 다변량 경시적 자료이며, 반응 변수로는 학교 적응도, 학업 성취도, 휴대전화 의존도를 고려한다. 자기 상관 구조와 혁신 표준 편차 구조를 달리 가정하여 여러 모형을 비교한다. 가장 적합한 모형에 대해 학교 적응도와 학업 성취도에 대해 모든 설명 변수가 유의미하며, 휴대전화 의존도가 반응 변수일 때 사교육 시간을 제외한 모든 설명 변수가 유의미한 것으로 나타난다.

• 대한통합의학회지
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• 제10권4호
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• pp.251-259
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• 2022

Purpose : This study was conducted to check the effect on nursing college students' major satisfaction, adjustment to college life and nurse's image nursing students before clinical practical education. Methods : The study surveyed 209 college students majoring in nursing science in the city of B for the period of April through May 2022. The collected data were analyzed using SPSS/WIN 22.0 to determine the frequency, percentage ratio, average, and standard deviation. Statistical analyses included the t-test, analysis of variance, pearson's correlation coefficients. Results : As a result of this study, the average degree of satisfaction with majors was 3.88±.50, the average of college life adaptation was 3.26±.47, and the average of the nurse image was 3.90±.51. The major satisfaction according to the general characteristics of the study subjects showed a statistically significant difference in the motive for choosing a department (F=3.70, p=.003) and the thought of a nursing job (F=2.95, p=.004). The adjustment to college life according to the general characteristics of the study subjects showed a statistically significant difference in grade (F=3.50, p=.001), department selection motivation (F=2.69, p=.022) showed a statistically significant difference. The nurse image showed a statistically significant difference in residence type (F=6.00, p=.001) and nursing job thinking (F=2.11, p=.036). The correlation between the variables of the study subjects showed that major satisfaction was found to have a positive correlation with adjustment college life (r=.51, p<.001) and nurse image (r=.54, p<.001). It was found that adjustment college life had a positive correlation with the nurse image (r=.32, p<.001). Conclusion : The higher the degree of satisfaction with the major of nursing students prior to clinical practice education, the higher the degree of adaptation to college life. It is need to intervention studies that can improve the image of positive nursing.

• 대한물리의학회지
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• 제9권1호
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• pp.63-68
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• 2014

PURPOSE: The purpose of this study was to examine the position changes with tilt table on autonomic nervous system using heart rate variability analysis. METHODS: Fourty healthy adult males volunteered in this study. The low frequency, high frequency and low frequency/high frequency ratio and mean heart rate, standard deviation of all normal R-R intervals, root mean square of successive differences, heart rate variability index were measured at the tilt table angle of $0^{\circ}$, $45^{\circ}$ and $90^{\circ}$ with pulsoximeter. Data were analyzed one-way ANOVA and LSD post hoc test. RESULTS: The mean heart rate, low frequency and low frequency/high frequency ratio increased significantly at higher angle of tilt table(p<.05). The root mean square of successive differences, heart rate variability index decreased significantly at lower angle of tilt table(p<.05). The standard deviation of all normal R-R intervals, high frequency decreased at higher angle of tilt table did not show significant difference. CONCLUSION: The symphathetic activity increased significantly at higher angle of tilt table. The parasymphathetic activity decreased at higher angle of tilt table, but the difference were not significant. The autonomic adaptation, balance and heart rate variability decreased significantly at higher angle of tilt table. Based on these results, in the treatment of patients with a change in posture precedence should be carefully treated. Further studies are necessary to determine the most safety and effective methods.