• 대한안전경영과학회지
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• 제19권4호
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• pp.301-307
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• 2017

The planing hull is characterized by a large change in the posture according to the speed, and the shape of the propeller varies, so that the hull resistance varies greatly depending on the propeller used. Especially, the Savitsky system, which is widely used for estimating the resistance of planing hull, does not consider the characteristics of these propeller and ship bottom spray rails. In this paper, in order to investigate the difference in resistance characteristics between the propeller and the bottom of the propeller of 6m and 12m class propeller using propeller such as outboard or stern drive, A comparative test was conducted on resistance and attitude posture changes in the Circulating Water Channel of Institute of Medium & Small Shipbuilding. As a result of comparison test, it was confirmed that there is a clear difference in the attitude change due to the presence of the bottom floor spray rail and the change in resistance characteristics due to the installation of the propeller. However, attitude change with the propeller was found to be insignificant.

• 간호행정학회지
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• 제5권3호
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• pp.463-475
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• 1999

This study investigated the relationship between nurses' Career Commitment and Organizational Commitment, and the moderating effect of individual career-related characteristics (age, tenure, position, number of department change, number of hospital change) on the relationship between career commitment and organizational commitment. The sample for this study consisted of 594 nurses from 8 large Korean hospitals. And the factor analysis, Cronbach's alpha, multiple regression analysis and two-way ANOVA were used for the statistical methods. Research was found that (1) career commitment and the two dimensions of organizational commitment(affective and transactional) were validated as distinct concepts for Korean nurses. (2) career commitment showed positive influence on the two dimension of organizational commitment, (3) all individual career-related characteristics did not moderated the effect of career commitment on affective commitment, but (4) number of career department change and of hospital change among career-related characteristics moderated the effect of career commitment on transactional commitment. Theoretical and practical implication of these result were discussed in the conclusion.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1316-1317
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• 2011

This paper presents analysis of temperature and light intensity characteristics of PV modules with solar cell type. Taking the effect of sunlight irradiance on the cell temperature, the first experiment takes ambient temperature as reference input and uses the solar insolation as a unique varying parameter. Then taking the effect of the cell temperature on sunlight irradiance, the second experiment takes 1000W/$m^2$ as reference input and uses the cell temperature as a unique varying parameter. As a result, varying sunlight irradiance, the Cell-Type with the smallest change in output is HIT and the Cell-Type with the biggest change in output is a-Si. Varying the cell temperature, the Cell-Type with the smallest change in output is a-Si and the Cell-Type with the biggest change in output is Single-Si. And considering both temperature and light intensity characteristics, the Cell-Type with the smallest change in output is HIT.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2008년도 추계 학술논문 발표대회
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• pp.89-92
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• 2008

This research analyzed the basic characteristics of unhardened concrete and the compression strength characteristics of hardened concrete according to liquidity retention agent mix rate change to improve the liquidity fluidity retention performance of high performance concrete, and produced the following results. The moment fluidity retention agent is added according to fluidity retention agent mix rate change, which increased fluidity retention agent mix rate, slump flow decreased, and in the case of slump flow according to the progress time change by the fluidity retention agent mix rates, the more fluidity retention agent mix rate increased, the lower slump flow change rate became. The moment fluidity retention agent is added according to fluidity retention agent mix rate change, fluidity retention agent mix rate increased compared to non-mixture of fluidity retention agent, and the air amount by progress time change by the fluidity retention agent mix rates slightly increased, however target range is still met and unit volume mass is inversely proportional to air amount. Compression strength according to age progress by the fluidity retention agent mix rates was shown to increase slightly with increase in fluidity retention agent mix rate, and yet the difference was not significant.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제27권1호
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• pp.129-150
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• 2024

This study utilized South Korean elementary and middle school student data to examine the longitudinal change trajectories of learning motivation types according to the longitudinal change trajectories of mathematics academic achievement. Growth mixture modeling, latent growth model, and multiple indicator latent growth model were used to examine various change trajectories for longitudinal data. As a result of the analysis, it was classified into 4 subgroups with similar longitudinal change trajectories of mathematics academic achievement, and the characteristics of the mathematics subject, which emphasize systematicity, appeared. Furthermore, higher mathematics academic achievement was associated with higher self-determination and higher academic motivation. And as the grade level increases, amotivation increases and self-determination decreases. This study suggests that teaching and learning support using this is necessary because the level of learning motivation according to self-determination is different depending on the level of mathematics academic achievement reflecting the characteristics of the student.

• 반도체디스플레이기술학회지
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• 제16권1호
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• pp.11-15
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• 2017

Lithium-ion batteries are widely used, from lightweight to energy-intensive, from small devices to large ESSs. However, it is sensitive to the surrounding environment and there is a change in performance depending on the temperature change. In this study, the temperature dependence of the charge / discharge characteristics of the battery is shown through simulation and the distribution of the salt concentration in the electrolyte is observed when the sudden temperature change is applied.

• 환경영향평가
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• 제25권4호
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• pp.296-306
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• 2016

기후변화에 대한 영향 및 위험은 지역적, 국지적 차원에서 더욱 확장되므로 기후변화에 따른 지역적 영향 및 특성을 반영한 기후변화 적응대책 마련의 필요성이 커지고 있다. 이에 본 연구에서는 기초지자체 적응대책의 분야별 사업 수 및 예산의 특성을 분석하고 피해사례와 비교 검토하여 기후변화 적응대책의 개선방향을 제시하고자 했다. 기초지자체 적응대책 특성 분석을 위해 군집분석을 통하여 지자체 적응대책의 유형별 특성을 파악 했다. 적응대책의 계획이 실제 기후변화로 인한 피해 내용을 잘 반영하고 있는지 검토하기 위하여 과거 24년 동안 지자체별 관측 영향 결과(신문기사 2,565건)와 비교 분석을 수행했다. 군집분석 수행 결과 군집은 4가지 유형으로 구분되었다. 전국 피해 유형으로 재난재해, 건강 부분에서 공통적으로 피해 빈도가 높은 것으로 분석되었으며, 적응계획 또한 재난재해, 건강, 농업, 물 관리 순서로 높은 비율을 보였다. 하지만 피해 사례 반영의 비중과 단기 및 장기 미래에 대한 고려 수준에 따라서 각 군집별로 피해빈도와 적응계획의 특성에서 차이를 보였다. 본 연구의 결과는 향후 기초지자체 특성 및 지역별 실질적 피해에 기반 한 적응대책 마련의 기초자료로 활용될 수 있을 것이라고 판단된다.

• 한국항공운항학회지
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• 제19권4호
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• pp.1-5
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• 2011

The free-wing tilt-body aircraft is researched in the flight performance characteristics for center of gravity (CG) change. All of speed, body tilt angle and center of gravity change are simulated to determine the flight envelope by a non-linear 3-DOF mathematical model. In flight, this aircraft configuration changes by the tiltable empennage. Then, flight dynamics distinguishes from those of a conventional fixed-wing aircraft. Though flight performance and trimmability are studied by CG change, the flight model of free-wing tilt-body aircraft is to reduce the hidden risk and to achieve the successful flight test. It is analyzed the flight characteristics by CG change that distinguishes free-wing tilt-body aircraft from the conventional aircraft.

• 한국공작기계학회논문집
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• 제13권2호
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• pp.120-126
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• 2004

This study proposed the analysis of mass position detection due to the change of the mass and strifeless of structure by using the original and modified dynamic characteristics. The method is applied to examples of the cantilevers beam and the 3 degrees of freedom system by modifying the mass. The predicted detection of the mass positions and magnitudes are in good agrement with the present study from the structural reanalysis using the modified mass.

• 한국산학기술학회논문지
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• 제16권5호
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• pp.3276-3283
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• 2015

본 연구 목적은 보건의료서비스 이용자의 사회경제적 특성이 보건의료서비스의 여건변화 지각에 미치는 영향을 파악하는 것이다. 연구대상은 우리나라 전국 표본가구원을 대상으로 설정하고, 자료는 층화비례계통추출방법을 이용하여 37,648개의 유효표본을 추출한 국가통계자료를 이용하였다. 통계분석은 인과관계를 확인하기 위하여 회귀모형을 설정하여 분석하였으며 그 결과는 다음과 같다. 첫째, 여자는 남자에 비하여 보건의료서비스에 대한 여건변화 지각이 긍정적이었다. 둘째, 연령이 증가할수록 보건의료서비스에 대한 여건변화 지각이 긍정적이었다. 셋째, 교육수준이 증가할수록 보건의료서비스에 대한 여건변화 지각이 긍정적이었다. 넷째, 가구소득이 증가할수록 보건의료서비스에 대한 여건변화 지각이 부정적이었다. 다섯째, 근로(고용)형태에서 임시근로자와 일용근로자는 상근근로자와 비교하여 보건의료서비스에 대한 여건변화 지각이 부정적이었다. 여섯째, 동부 거주자는 읍면부 거주자보다 보건의료서비스에 대한 여건변화 지각이 부정적이었다. 결론으로 사회경제적 특성은 보건의료서비스 여건변화 지각에 영향을 미친다고 할 수 있으며, 보건의료서비스 이용자의 여건변화 지각이 수혜적 측면에서 긍정적으로 작용하고 있다고 볼 수 있다.