• 한국컴퓨터정보학회논문지
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• 제19권11호
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• pp.183-192
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• 2014

휴대폰 보급의 활성화와 모바일 광고의 확산으로 인해 새로운 광고 채널로 부상하고 있는 모바일 광고에 대한 다국적 소비자들의 태도나 행동의지를 이해하는 작업이 중요한 요소가 되었다. 모바일 광고의 특정 영역은 여전히 추가적인 연구가 필요하며, 특히, 모바일 광고에 대한 고객의 태도는 많은 관심을 받고 있는 영역이다. 본 연구는 기존의 기술수용모형을 바탕으로 모바일 광고 특성과 구매의도간의 관계를 조사하고, 국적에 따른 조절효과를 분석하였다. 본 연구의 결과는 모바일 광고의 효과성을 향상시키기 위해 노력하고 있는 연구자들이나 광고 실무자들이 관심을 가져야할 요소들을 이해하는데 유용한 정보를 제공할 것이다.

• Advances in aircraft and spacecraft science
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• 제9권5호
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• pp.433-447
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• 2022

This work deals with an explicit guidance and control architecture for autonomous lunar ascent and orbit injection, i.e., the locally-flat near-optimal guidance, accompanied by nonlinear reduced-attitude control. This is a new explicit guidance scheme, based on the local projection of the position and velocity variables, in conjunction with the real-time solution of the associated minimum-time problem. A recently-introduced quaternion-based reduced-attitude control algorithm, which enjoys quasi-global stability properties, is employed to drive the longitudinal axis of the ascent vehicle toward the desired direction. Actuation, based on thrust vectoring, is modeled as well. Extensive Monte Carlo simulations prove the effectiveness of the guidance, control, and actuation architecture proposed in this study for precise lunar orbit insertion, in the presence of nonnominal flight conditions.

• 융합정보논문지
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• 제10권10호
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• pp.183-195
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• 2020

본 연구에서는 대학수학 메이커수업 특성의 요인인 강사역량, 교육프로그램, 교육서비스, 물리적 교육환경 요인과 대학생들의 수학에 대한 흥미 및 태도 간의 영향관계를 검증하는 것을 목적으로 하였다. 부산권 소재 대학교에 재학 중인 이공계열 남녀 대학생 228명을 대상으로 설문조사를 실시하였고, SPSS 26.0 프로그램을 활용하여 실증분석을 수행하였다. 연구결과 첫째, 대학수학 메이커수업 특성 요인 중 강사역량(β=.349, t=6.380, p<.001), 교육프로그램(β=.361, t=5.650, p<.001), 물리적 교육환경(β=.196, t=3.281, p<.01) 요인이 대학생의 수학에 대한 흥미에 유의미한 정(+)의 영향을 미쳤다. 둘째, 대학수학 메이커수업에 대한 흥미(β=.349, t=6.380, p<.001) 요인은 대학생의 수학에 대한 태도에 유의미한 정(+)의 영향을 미치는 것으로 나타났다. 셋째, 대학수학 메이커수업 특성 요인 중 강사역량(β=.340, t=6.365, p<.001), 교육프로그램(β=.352, t=5.559, p<.001), 물리적 교육환경(β=.226, t=3.537, p<.01) 요인이 대학생의 수학에 대한 태도에 유의미한 정(+)의 영향을 미치는 것으로 나타났다. 본 연구의 결과를 통해 대학수학 메이커수업의 교육프로그램 수준과 강사역량이 높고, 물리적 교육환경이 뛰어날 때, 대학생의 수학에 대한 태도 뿐 아니라 궁극적으로 수학에 대한 태도에도 긍정적인 영향을 미칠 수 있다는 결론에 도달하였다.

• Journal of Astronomy and Space Sciences
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• 제19권2호
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• pp.107-122
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• 2002

Multi-body spacecraft attitude and configuration control formulations based on the use of collaborative control theory are considered. The control formulations are based on two-player, nonzero-sum, differential game theory applied using a Nash strategy. It is desired that the control laws allow different components of the multi-body system to perform different tasks. For example, it may be desired that one body points toward a fixed star while another body in the system slews to track another satellite. Although similar to the linear quadratic regulator formulation, the collaborative control formulation contains a number of additional design parameters because the problem is formulated as two control problems coupled together. The use of the freedom of the partitioning of the total problem into two coupled control problems and the selection of the elements of the cross-coupling matrices are specific problems ad-dressed in this paper. Examples are used to show that significant improvement in performance, as measured by realistic criteria, of collaborative control over conventional linear quadratic regulator control can be achieved by using proposed design guidelines.

• Journal of Biosystems Engineering
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• 제35권5호
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• pp.302-309
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• 2010

Aerial application using an unmanned agricultural helicopter would allow precise and timely spraying. The attitude of a helicopter depends on a number of dynamic variables for roll-balanced flight. Laterally tilting behavior of a helicopter is a physically intrinsic phenomenon while hovering and forwarding. In order to balance the fuselage, the rotor should be counter-tilted, resulting in the biased down-wash. The biased spraying toward right side causes uneven spray pattern. In this study, a raised tail rotor system for the roll-balanced helicopter was studied. Thrust of the tail rotor system was measured and theoretically estimated for the fundamental database of the roll-balanced helicopter design. The estimated tail thrust and roll-moment would be used to design the raising height of tail rotor and roll balancing dynamics. The unmanned agricultural helicopter required the tail rotor thrust of about 39.2 N (4.0 kgf) during hovering with a payload of 235.4 N (24 kgf). A raised tail rotor system would compensate for the physical tilt phenomena. A further attitude control system of helicopter would assist roll-balanced aerial spray application.

• 대한조선학회논문집
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• 제48권4호
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• pp.357-362
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• 2011

It has been often reported that a water-jet propelled high speed vessel lost the course keeping ability in seaway. In this study, model tests of a high speed vessel were performed to measure the running attitude and to check the course keeping ability. The model ship may lose the course keeping ability due to bad running attitudes such as bow drop. So model tests were carried out to improve the running attitude by changing the position of longitudinal center of gravity and using appendages at the bow and the stern of a model. The position of lateral center of pressure moved toward stern and the course keeping ability was improved by modifying the transom wedge angle.

• 한국환경과학회지
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• 제13권10호
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• pp.955-963
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• 2004

This study was conducted to find and explain characteristics of diverse social groups' attitudes toward nuclear power plant. 7 hypotheses were constructed and statistically tested. In order to test 7 hypotheses, both Nuclear Energy Attitude Scale and Environmental Attitude Scale were distributed and field surveyed on 839 respondents representing a diverse range of subject groups. The results showed that 6 hypotheses were statistically accepted while 1 hypothesis statistically rejected. Contrary to the first hypothesis, this test found that people in close proximity to the nuclear power plant had more positive attitudes toward nuclear power than those living in distance from the nuclear power plant. Males had more positive nuclear energy attitudes than females. Academic backgrounds were not related to nuclear energy attitudes. Environmental attitudes showed negative relationship with nuclear energy attitudes. While anti-nuclear citizen action groups had the most negative attitudes, nuclear power plant workers had the most positive attitudes among responding groups. Finally, university students majoring in nuclear engineering had more positive attitudes than those of religious studies.

• 한국지구과학회지
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• 제36권5호
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• pp.484-499
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• 2015

This study explores the impact of a STEM integration teacher professional development program focusing on teachers' perception of engineering and their attitudes toward integrating engineering into teaching. A total of sixty-eight teachers from ten schools participated in the program for five days. Data are collected from three main sources including (1) pre and post concept maps probing teachers' perceptions about the engineering discipline, (2) a pre and post survey measuring teachers' self-efficacy of teaching science/mathematics within the engineering context, and (3) engineering integrated science and (or) mathematics lesson plans and teaching reflections. This study utilizes both qualitative and quantitative research methods depending on the data we have collected. The results show that both science and math teachers thought that integrating engineering into teaching provided valuable outcomes, i.e., promoting students' learning about engineering and improving their interest in science or math through real-world problem solving exercises. Participants also felt more comfortable about integrating engineering in their teaching after the program. The results also imply that the teachers' understandings of engineering become more concrete after the program. This study also provides an overview of the challenges and advantages of teaching engineering in K-12 science and mathematics classrooms.

• 한국학교ㆍ지역보건교육학회지
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• 제16권2호
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• pp.89-100
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• 2015

Objectives: This study was carried out to measure knowledge, attitude, and practice and related factors of low-salt diet among university students. Methods: Data from a convenience sample of 251 nursing and engineering students of two universities in south-western part of Korea were collected during March 16~20, 2015 using a self-reporting questionaire and urine test. The instruments developed by Lee and Song(1999) were used to measure knowledge and practice, and Ahn(2013) for attitude toward low-salt diet. A spot urine salt stick($SaltSinal^{(R)}$) was also used to evaluate practice of low-salt diet. Data were analyzed using SPSS 21.0, and t-tests, ANOVA, Pearson correlation, and Scheffe test were used. The study was IRB approved. Results: Knowledge, attitude, and practice of low-salt diet was low and spot urine salt level was high among university students. Knowledge and attitude were higher and spot urine salt level was lower among nursing students. Knowledge and attitude were related to gender and drinking. Living arrangement, monthly allowance, smoking, frequency of eating-out, frequency of breakfast were shown not to be related to knowledge and attitude. None of the variable investigated were significantly related to practice of low-salt diet. However, spot urine salt was related with gender, living arrangement, and smoking. Conclusions: A rigorous health education is necessary in order to lower dietary salt among university students. Considering frequent eating-out among university students, it is also very important to lower salt amount in foods sold on- and off-campus.

• 산업융합연구
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• 제21권4호
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• pp.1-12
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• 2023

디지털 전환은 금융, 물류 등을 포함한 산업계, 학계에서 급부상하고 있으며, 디지털 전환 분야에 관한 컨설팅 시장도 함께 성장하고 있다. 선행연구에 따르면, 컨설팅 기관의 디지털 전환에 관한 필요성이 제기되고 있다. 이 과정에서 컨설턴트의 역할은 시대에 맞게 변화되어야 하며, 고객관계관리, 고객에 대한 태도가 강조되고 있다. 하지만 컨설팅 연구는 이에 관한 연구가 심도 있게 연구되지 않은 점이 있다. 따라서 본 연구는 디지털 전환 분야의 컨설턴트 태도에 초점에 맞춰 태도의 요소를 개발하는 것이 목적이다. 문헌분석과 수정된 델파이 기법을 활용하여 연구한 결과, '고객지향성', 성취지향성', 전문가 품위', 전문성 유지', 그리고 '윤리성' 등이 핵심 태도 요소인 것으로 도출되었다. 본 연구는 디지털 전환 시대에 맞게 디지털전환 분야의 컨설턴트 태도 요소를 탐색적이며, 내용타당도를 검증하여 개발했다는 것에 의의가 있으며, 디지털 전환 분야의 컨설턴트는 실무적으로 태도의 중요성을 인식하고 역량 향상의 기초 도구로 활용할 수 있을 것이다.