• Journal of Digital Convergence
• /
• v.16 no.9
• /
• pp.319-327
• /
• 2018

This study is a qualitative study using focus group interview to explore the perception regarding smartphone use for adhering to self-care in chronic heart failure patients. Eleven patients who were diagnosed with heart failure were included. Three focus groups were held with heart failure patients at an outpatient cardiac care center. The focus group discussions were transcribed verbatim and analyzed using the method of constant comparative analysis. The 12 sub-themes were categorized into 'perception of smartphone use', 'Barriers to smartphone use', and 'Facilitators to smartphone use'. We found that the need to design tailored the messages or health information based on individual preferences. Our findings will be used to develop or design a smartphone based self-care program for patients with heart failure.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.1
• /
• pp.429-437
• /
• 2015

The purpose of this study was to investigate physical activity level, sleep quality, attention control, and self-regulated learning along to smartphone addiction level among college students. The data were obtained from 269 college students by structured questionnaire, analyzed using SPSS 18.0. The results showed that significant differences with smartphone addictoin level and, gender, grade level, daily using time, physical activity level, sleep quality and attention control. Smartphone addictoin level have correlations with physical activity level, sleep quality, attention control, and self-regulated learning. To prevent the falling off of physical strength and poor school performance, it is needed a strategies for control of smartphone addiction.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.1
• /
• pp.199-207
• /
• 2018

The purpose of this study was to examine the mediating effects of resiliency on the relationship between smartphone addiction and subjective happiness among university students. Participants included 570 students attending universities in Seoul, Gyeonggi, and Chungnam areas using self-report questionnaires. Data was analyzed with SPS 23.0 using descriptive statistics, Pearson's correlation coefficient, hierarchical multiple regression, and Sobel test with SPSS 23.0. The study results were as follows: first, as smartphone addiction increased, subjective happiness decreased (${\beta}=-.17$, p<.001). Second, as smartphone addiction increased, resiliency decreased (${\beta}=-.24$, p<.001). Third, as resilience increased, subjective happiness increased (${\beta}=.36$, p<.001). Fourth, resiliency partially mediated the relationship between smartphone addiction and subjective happiness (Z=-4.645, p<.001), and explained 16% of the variance. Findings show that resiliency can play a role in improving subjective happiness of university students. Finally, the implications and limitations of findings were discussed based on the results.

• Korean Journal of Remote Sensing
• /
• v.27 no.5
• /
• pp.555-563
• /
• 2011

Nowadays, demands with respect to applications based on geo-based information on mobile device such as smartphone and those based on open platform or open source have been increasing. This trend can be regarded as significant opportunities to widen application fields and to expand industry business cases using satellite imagery. However, it needs a different approach from conventional remote sensing researches. This work focuses on SAR among many kinds of geo-based data resources. First, an application for Interferometric SAR processing based on open source was implemented. And using this, InSAR data was processed and stored into database. When smartphone users at any places request InSAR results, they can receive InSAR information and concerned metadata on their device. An smartphone application for this task was designed and implemented in this study. This provides a practical way for SAR service for smartphone, and can apply to build mobile service system of complex and compound types of remote sensing resources and their derived contents.

• The Journal of Information Systems
• /
• v.20 no.3
• /
• pp.257-277
• /
• 2011

The current study categorizes factors of smartphone into three, using KANO model: attractive factors which cause only product satisfaction, must-be factors for dissatisfaction, and one-dimensional factors for both. Based on it, it presents a new model for the effects that smartphone factors have on satisfaction or dissatisfaction. The purpose is to theoretically explain that smartphone factors on which companies and users place a high value can actually affect satisfaction or dissatisfaction. After choosing 15 factors out of 25 which had been selected through literature study, these were divided into attractive, must-be, and one-dimensional ones. 93 out of 109 questionnaires returned were used for analysis. After frequency analysis using SPSS were conducted on the surveys, the factors were grouped, based on KANO table. The grouping results are as follows. Attractive factors include 'expansion slots for external memory, battery desorption, brand awareness, mobile banking and internet telephony'. Must-be ones include 'multi-touch, information security, entertainment, information retrieval, location based service and SNS. Finally, 'screen visibility, size of internal memory, the amount of internal memory, battery life, and response to after-sales service' are classified as one-dimensional factors. A critical finding of this paper is that since the results are different depending on the operating system of smartphones, it must be taken into consideration in studies on smartphones. The wide and rapid spread of smartphones has changed people's lifestyle as well as business environment, which forces companies to compete with each other to adapt to the changed circumstances. In this competitive system, studies on smartphone factors of satisfaction and dissatisfaction are essential for firms to establish a new strategy. From this point of view, the present paper is expected to be a basic material for enterprises not only to develop goods and services that maximize customer satisfaction and minimize dissatisfaction, but also to establish the future business strategy.

• Journal of Korean Society for Quality Management
• /
• v.40 no.3
• /
• pp.359-371
• /
• 2012

Purpose: Due to the explosive growth and widespread use of smartphones, new business opportunities are emerging. Despite the importance of creating customer value in using smartphone applications, past studies on have mainly focused on functions or factors and specifications that influence users to use the device. Methods: This study is intended to identify how customer dissatisfaction from the use of smartphone application services affects customer sentiment and behavior. The research model is tested via a survey of 290 smartphone application users. Results: The result of this empirical study indicates that customer dissatisfaction significantly affects the user's disappointment and regret in using a service, which are subordinate values of customer emotion. The user's anger is positively associated with 'Negative word of mouth' and 'Complaint', which are subordinate values of customer behavior, but not with an intention to switch to another service. 'Regret' and 'Disappointment' are positively associated with 'Negative word of mouth' and 'Switching intention', but not with 'Making direct complaints'. Finally, customer's negative sentiments are a significant intermediary in the relationship between customer dissatisfaction and behavioral response. Conclusion: Finally, the study offers a more systematic understanding on the phasal response process of customer dissatisfaction in relation to the provision of smartphone application services.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.8 no.5
• /
• pp.373-383
• /
• 2015

This paper proposes a decision support system to recognizing retinal diseases. This paper uses a smartphone platform and cloud computing as the base of the system. A microscopic lens is attached int' the smartphone camera to capture the user retinal image for recognizing the user's retinal condition. An application is assembled in computer and then installed in to the smartphone. The application role is to connect between the system in smartphone and system in cloud, the application will send the retinal image to the cloud system to be classified. The paper uses OCFE (optimized classifier based on feature elimination) algorithm as the classifier. The retinal image is trained using combination of two ophthalmology databases DIARETDB1 v2.1 and STARE. Therefore, this system average accuracy is 88%, while the average error rate is 12%.

• Journal of Broadcast Engineering
• /
• v.22 no.2
• /
• pp.173-181
• /
• 2017

In this paper, we propose a musical instrument conversion based music ensemble application for smartphone. If we try to create ensemble music using virtual instruments provided by the conventional smartphone application, we should know how to play each instrument. In addition, it is impossible to play the instrument in a natural way if the smartphone screen cannot show the entire part of the instrument. To solve this problem, in this paper, we propose a smartphone application that records music sound by playing an acoustic guitar, converts it to other instruments' sound, applies effect to the converted sound, and creates a final ensemble music after mixing all sounds. Using the proposed application, the user can create ensemble music only by playing the acoustic guitar.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.05a
• /
• pp.450-451
• /
• 2017

The purpose of this study was to analyze whether tourism information is influenced by information collected through smartphone. Especially, this study investigated the behavior of tourists visiting Jeju by using the information of smartphone, and analyzed the collected data to find out the marketing implications for Jeju tourist. This study analyzed how smartphone information influenced individual 's behavior after distributing direct questionnaires to tourists. The data of total 230 tourists who visited the tour in April, 2017 were collected and analyzed. As a result of the analysis, it was statistically verified that the information of the smartphone affected the behavior of the tourist. Though this analysis, this study can contribute to the establishment of diverse management strategies using the understanding of the behavior of tourists and marketing implications by investigating the effect of smartphone information on the behavior of tourists.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2014.10a
• /
• pp.394-397
• /
• 2014

Most of Koreans have smartphone. By using smartphone, they have done internet-banking, e-commerce and private scheduling. However, convenience of smart phone has been made side effect such as tool of fraud and crime. Especially, Smishing on smartphone has been increased rapidly since 2013. Smishing have utilized social-engineering technique with social issue such as Korean near-sea cruse ship, 'Sewol-Ho', Sinking and traditional thanks-giving holiday, 'Chu-Seok', etc. This paper proposed the oncoming trend of smishing on smartphone after 2014. This paper also analyzed the process and technique of smishing on internal financial fraud. It also covered smartphone forensic for using legal evidence. By discovering the connectivity of smishing and financial fraud, this paper could be reference for social security on smartphone.