• Journal of the Korean Society of Marine Environment & Safety
• /
• v.23 no.5
• /
• pp.447-454
• /
• 2017

Using two large coast guard ships at sea, we created four encounter situations ($000^{\circ}$, $045^{\circ}$, $090^{\circ}$, $135^{\circ}$) with high possibility of collision, from 3 NM up to 0.25 NM. As relative distance was gradually decreased, the subjects were measured at 0.25 NM intervals and perceived ship collision risk (PSCR) was determined by looking at the opponent ship. Characteristics were statistically analyzed using the obtained data. The purpose of this study was to analyze the characteristics of collision risk values obtained from twelve intervals, from 3 NM to 0.25 NM relative to encounter situations by curve fitting with appropriate polynomials, to determine the distance from which the change in perceived collision risk is greatest. As a result, an optimal regression equation for each distance interval was derived from each analysis direction. The greatest variation in average collision risk value was over the range 1.25 ~ 1 NM, and the collision risk value was largest at 1 NM. The maximum change in perceived collision risk was at 1 NM. These results can contribute to preventive guidelines to minimize human error in close proximity situations with a high probability of ship collision.

• International Journal of Advanced Culture Technology
• /
• v.11 no.4
• /
• pp.302-309
• /
• 2023

Wearable devices, attached to the human body, track and enhance users' activities, health, and communication. Therefore, considering ergonomic factors in product design is crucial. However, previous research has somewhat overlooked the importance of integrating ergonomic design elements into a broad spectrum of design factors. This study aims to examine the impact of physical attributes inherent in smart wristbands and smartwatches on the perceived functional value, specifically, perceived usefulness, ease of use, and fit. A survey was conducted among 289 US adults who had experience using smart wristbands or smartwatches. The collected data were analyzed using descriptive statistics, factor analysis, Cronbach's alpha, t-test, MANOVA, and regression analysis in SPSS version 29. The results showed that the shape of the front display significantly influenced perceived ease of use, and the product's weight had a substantial impact on both perceived ease of use and fit. Furthermore, distinct technical features on the front display had varied effects on perceived usefulness, ease of use, and fit. Notably, the presence of activity tracking, alarm, and calendar functionalities led to distinct differences in ease of use and fit. Features such as distance tracking, phone call, social media notifications, text messaging, and time display functions showed significant influences on the perception of fit. These findings provide insights into the physical values of smart wristbands and smartwatches as perceived by users.

• Journal of Digital Convergence
• /
• v.17 no.11
• /
• pp.97-104
• /
• 2019

Consumers possess their own psychological distance towards products. Based on the construal-level theory, this study aims to analyze which type of advertising appeal is more effective according to psychological distance. Also this study conducts neurophysiology experiment through eye-tracker. By using eye-tracking methods, participants' responses to products was measured and analyzed accordingly. Results revealed that consumers prefer rational appeals when the psychological distance is perceived near, while emotional appeals are preferred when the psychological distance is perceived far. In addition, eye movements measured in Visit Count(VC), Fixation Count(FC), and Total Fixation Duration(TFD) showed significant difference when participants are viewing preferred and non-preferred appeals.

• The Journal of Information Systems
• /
• v.15 no.3
• /
• pp.35-53
• /
• 2006

Distance teaming systems have become popular tools for teaching and learning. The purpose of this study is to analyze influence of instructor factors and media richness on student's intention th use and performance in distance teaming. We used TAM as a theoretical foundation to explain student's behavior. The model was tested using LISREL analysis on the sample of 246 users rho have experience with the distance teaming systems. The results show that instructor factors such as luぉ style and attitude have partial effects on perceived usefulness, ease of use and media richness. In addition, results also show that both TAM variables and media richness strongly predict intention In use of the distance loaming system Finally, the usage intention has a positive effect on teaming performance. Implications of these findings are discussed for researchers and practitioners.

• Nuclear Engineering and Technology
• /
• v.49 no.5
• /
• pp.1090-1094
• /
• 2017

The determinants of the public's nuclear power acceptance have received considerable attention as decisive factors regarding nuclear power policy. However, the contingency of the relative importance of different determinants has been less explored. Building on the literature of psychological distance between the individual and the object, the present study demonstrates that the relative effects of different types of perceived risks regarding nuclear power generation differ across acceptance targets. Using a sample of Korea, our results show that, regarding national acceptance of nuclear power generation, perceived risk from nuclear power plants exerts a stronger negative effect than that from radioactive waste management; however, the latter exerts a stronger negative effect than the former on local acceptance of a nuclear power plant. This finding provides implications for efficient public communication strategy to raise nuclear power acceptance.

• Korean Journal of Cognitive Science
• /
• v.34 no.3
• /
• pp.181-196
• /
• 2023

Size, velocity, and time equivalence are mechanisms that allow us to perceive objects in three-dimensional space consistently, despite errors on the two-dimensional retinal image. These mechanisms work on common cues, suggesting that the perception of motion distance, motion speed, and motion time may share common processing. This can lead to the hypothesis that, despite the spatial nature of visual stimuli distorting temporal perception, the perception of motion speed and the perception of motion duration will tend to oppose each other, as observed for objects moving in the environment. To test this hypothesis, the present study measured perceived speed using Müller-Lyer illusion stimulus to determine the relationship between the time-perception consequences of motion stimuli observed in previous studies and the speed perception measured in the present study. Experiment 1 manipulated the perceived motion trajectory while controlling for the retinal motion trajectory, and Experiment 2 manipulated the retinal motion trajectory while controlling for the perceived motion trajectory. The result is that the speed of the inward stimulus, which is perceived to be shorter, is estimated to be higher than that of the outward stimulus, which is perceived to be longer than the actual distance traveled. Taken together with previous time perception findings, namely that time perception is expanded for outward stimuli and contracted for inward stimuli, this suggests that when the perceived trajectory of a stimulus manipulated by the Müller-Lyer illusion is controlled for, perceived speed decreases with increasing duration and increases with decreasing duration when the perceived distance of the stimulus is constant. This relationship suggests that the relationship between time and speed perceived by spatial cues corresponds to the properties of objects moving in the environment, i.e, an increase in time decreases speed and a decrease in time increases speed when distance remains the same.

• Educational Technology International
• /
• v.22 no.2
• /
• pp.111-137
• /
• 2021

Embracing the important roles of presence, this study focused on exploring how to enhance online learners' learning engagement and learning achievement in distance higher education settings. More specifically, this study examined the structural relationships among university students' teaching presence, social presence, learning engagement, and perceived learning achievement in online learning environments using structural equation modeling. Data were collected from 206 university students enrolled in online courses in the second semester of 2020 at two large universities. According to the results of the data analysis, there was a significant relationship between teaching and social presence. Teaching presence and social presence predicted learning engagement that positively affected perceived learning achievement. Teaching presence was strongly associated with perceived learning achievement while social presence had a negative impact on that. Additionally, learning engagement had a mediating effect on the relationship between teaching presence and perceived learning achievement. This study found that students who perceived higher levels of teaching and social presences tend to more engage in learning, leading to perceiving better learning achievement. The findings suggest that the design, development, and implementation of effective online instruction should be needed to promote learning engagement, which can be linked to enhancing students' learning achievement. Implications and discussion are addressed in this article.

• Journal of the Korean Society of School Health
• /
• v.29 no.3
• /
• pp.123-131
• /
• 2016

Purpose: Human Papillomavirus(HPV) vaccination is the best prevention for cervical cancer. Therefore, this study was to examine the best predictors of HPV vaccination status in female nursing university students. Methods: Five hundred and forty junior and senior female nursing students from Seoul and provinces of Kyunggi, Chungcheong and Gyungsang completed paper and pencil questionnaires. Descriptive statistics, $x^2$ test, t-test, and multiple logistic regression with dummy variables were conducted using SAS 9.2. Results: Of the total students, 56.8% were vaccinated. As a result of the analysis of the bivariate relationships, family economic status, school type, perceived susceptibility, perceived benefit and perceived barriers (cost, time, distance from hospital and side effects) were significantly related to vaccination status. After controlling for the general characteristics and the HPV related knowledge score, higher family economic status (Adjusted Odds Ratio [AOR]: 3.78, 95% Confidence Interval [CI]: 1.21~11.76), private university (AOR: 1.69, 95% CI: 1.14~2.53), higher perceived benefit (AOR: 1.80, 95% CI: 1.47~2.20), lower perceived barrier (cost) (AOR: 0.86, 95% CI: 0.74~0.99), lower perceived barrier (time) (AOR: 0.71, 95% CI: 0.61~0.84), and lower perceived barrier (side effects) (AOR: 0.82, 95% CI: 0.72~0.94) were significantly related to HPV vaccination. Perceived benefit, perceived barrier (time) and perceived barrier (side effects) were the top 3 predictors of HPV vaccination status. Conclusion: This study suggests that vaccinated female nursing students were more likely to be from higher family economic status and private universities and have a higher perception of benefit and a lower perception of barriers (cost, time, and side effects). Thus, efforts to increase HPV vaccination rates of female nursing students should focus on improving their perception of benefit while lowering their perception of barriers, particularly cost, time and side effects.

• Journal of the Korean Society of Food Culture
• /
• v.25 no.6
• /
• pp.661-670
• /
• 2010

Although many studies have suggested that introducing the distance learning method, including Web-based learning, to a practice class is effective, studies applying the distance learning method to subjects who are practicing cooking are rare. The purpose of this study was to determine the perception of the distance learning method, the degree of computer use, and the use of distance learning by college students with cuisine-related majors to practice cooking. The results showed that most students used the distance learning method, and that the method was positively perceived, as it was a great aid in learning. Most of the cooking information was obtained through the internet, and the most effective learning media for practicing cooking was "e-learning" using a computer. The most effective learning method for those who were practicing cooking was a "face-to-face learning method", because face-to-face type of teaching and learning was most universally recognized. Most of the students surveyed responded that using the distance learning method was a positive experience, indicating that cyber lectures could be applied at more universities for subjects practicing cooking.

• Journal of Practical Engineering Education
• /
• v.16 no.4
• /
• pp.577-585
• /
• 2024

This study analyzed the relationship between GPS-based physical activity patterns and mental health using Kaggle Student Life data. Data were collected over a 10-week period from 48 students at Dartmouth College through Android smartphones and included GPS, dark, and phone lock data, and measures such as the Patient Health Questionnaire-9 (PHQ-9), Loneliness Scale, the Positive and Negative Affect Schedule (PANAS), and Perceived Stress Scale. Using latitude and longitude data obtained from GPS measurements, various physical activity indicators were calculated, including the total distance traveled, average distance traveled, average distance traveled in the morning, average distance traveled in the afternoon, average distance traveled in the evening, and average distance traveled in the middle of the night. Pearson's correlation analysis was performed to explore the relationship between GPS-based physical activity patterns and mental health. The study results indicated a significant negative correlation between the average distance traveled in the afternoon and PHQ-9 scores. Results indicated that the higher the afternoon activity, the lower the depressive symptoms. There was a positive correlation be-tween the PANAS-Pos score and the average distance traveled in the evening, indicating that positive emotions tended to increase as evening activities increased. This finding suggests a relationship between physical activity at specific times and mental health.