• Asia pacific journal of information systems
• /
• v.27 no.1
• /
• pp.38-53
• /
• 2017

As sensor technologies and image processing technologies make collecting information on users' behavior easy, many researchers have examined automatic emotion recognition based on facial expressions, body expressions, and tone of voice, among others. Specifically, many studies have used normal cameras in the multimodal case using facial and body expressions. Thus, previous studies used a limited number of information because normal cameras generally produce only two-dimensional images. In the present research, we propose an artificial neural network-based model using a high-definition webcam and Kinect to recognize users' emotions from facial and bodily expressions when watching a movie trailer. We validate the proposed model in a naturally occurring field environment rather than in an artificially controlled laboratory environment. The result of this research will be helpful in the wide use of emotion recognition models in advertisements, exhibitions, and interactive shows.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.45 no.2
• /
• pp.7-12
• /
• 2008

In this study, the wide width effect that the increasing rate of drain current and the value of cutoff frequency decrease with larger finger number is observed. For modeling this effect, an improved SPICE MOSFET RF model that finger number-independent external source resistance is connected to a conventional BSIM3v3 RF model is developed. Better agreement between simulated and measured drain current and cutoff frequency at different finger number is obtained for the improved model than the conventional one, verifying the accuracy of the improved model for $0.13{\mu}m$ multi-finger MOSFET.

• The Journal of Pediatrics of Korean Medicine
• /
• v.33 no.1
• /
• pp.17-33
• /
• 2019

Objectives The purpose of this study is to investigate the current status of registration of interventional studies focusing on children and adolescents in South Korea and the status of Korean medicine interventional studies through Clinical Research Information Service (CRIS). Methods CRIS was used to search interventional clinical researches which were registered from May, 2010 to October, 2018. Key words of 'child', 'children', 'adolescents', 'infant', 'toddler', 'elementary school student', 'middle and high school', 'middle school student', and 'high school student' were used. Results A total of 37 intervention clinical studies were selected. To identify the trends, years of registration in the CRIS, intervention types, disease categories, recruitment status, phase, institutions responsible for the research, consent, compensation and safety investigation were analyzed. Conclusions This study shows the current state of registration of interventional studies in children and adolescents in Korea. Since interventional studies in children and adolescents are essential for providing safe and effective treatment, further interventional studies, Korean medicine interventional studies and ethical considerations are needed.

• 한국경영정보학회:학술대회논문집
• /
• 2007.11a
• /
• pp.82-87
• /
• 2007

The importance of information technology (IT) has been emphasized in developing countries recently. Despite the importance of the topic area of the productivity of IT in developing countries, the literature to date is relatively sparse. The findings of almost all these studies are based on data collected in developed countries. Few studies have been conducted to validate these results and to see if they are still applicable in developing countries. This study tries to investigate the effects of IT investment on productivity in the electronics industry of China, which is a representative developing country, with production function model. The results show that there is a positive impact of IT investment on productivity in China similar to previous studies in developed countries.

• Journal of Information Processing Systems
• /
• v.16 no.4
• /
• pp.915-934
• /
• 2020

Software refactoring is a process to restructure an existing software code while keeping its external behavior the same. Currently, various refactoring techniques are being used to develop more readable and less complex codes by improving the non-functional attributes of software. Refactoring can further improve code maintainability by applying various techniques to the source code, which in turn preserves the behavior of code. Refactoring facilitates bug removal and extends the capabilities of the program. In this paper, an exhaustive review is conducted regarding bad smells present in source code, applications of specific refactoring methods to remove that bad smell and its effect on software quality. A total of 68 studies belonging to 32 journals, 31 conferences, and 5 other sources that were published between the years 2001 and 2019 were shortlisted. The studies were analyzed based on of bad smells identified, refactoring techniques used, and their effects on software metrics. We found that "long method", "feature envy", and "data class" bad smells were identified or corrected in the majority of studies. "Feature envy" smell was detected in 36.66% of the total shortlisted studies. Extract class refactoring approach was used in 38.77% of the total studies, followed by the move method and extract method techniques that were used in 34.69% and 30.61% of the total studies, respectively. The effects of refactoring on complexity and coupling metrics of software were also analyzed in the majority of studies, i.e., 29 studies each. Interestingly, the majority of selected studies (41%) used large open source datasets written in Java language instead of proprietary software. At the end, this study provides future guidelines for conducting research in the field of code refactoring.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.12 no.12
• /
• pp.6034-6056
• /
• 2018

This paper describes two user studies in remote collaboration between two users with a video conferencing system where a remote user can draw annotations on the live video of the local user's workspace. In these two studies, the local user had the control of the view when sharing the first-person view, but our interfaces provided instant control of the shared view to the remote users. The first study investigates methods for assisting drawing annotations. The auto-freeze method, a novel solution for drawing annotations, is compared to a prior solution (manual freeze method) and a baseline (non-freeze) condition. Results show that both local and remote users preferred the auto-freeze method, which is easy to use and allows users to quickly draw annotations. The manual-freeze method supported precise drawing, but was less preferred because of the need for manual input. The second study explores visual notification for better local user awareness. We propose two designs: the red-box and both-freeze notifications, and compare these to the baseline, no notification condition. Users preferred the less obtrusive red-box notification that improved awareness of when annotations were made by remote users, and had a significantly lower level of interruption compared to the both-freeze condition.

• Transactions of the Society of Information Storage Systems
• /
• v.9 no.2
• /
• pp.32-35
• /
• 2013

Nowadays, function related to anti-vibration and anti-shock of storage devices is required because of portability. Therefore, many hard disk drive (HDD) studies about external shock and vibration have been performed. Especially, many studies are performed with non-operational shock. Most studies have used the fixed condition between spindle system and base when they wanted to analyze dynamic behavior of inner parts in simulation. But spindle system has actually stiffness and damping coefficient. Maybe difference of value would be happened between fixed condition and spring condition. So, we measured FRF of spindle system to know stiffness and damping coefficient in HDD. And we studied on dynamic behavior of inner parts by using calculated stiffness and damping coefficient. As a result, we confirmed the difference as boundary condition of spindle system.

• Korean Journal of Acupuncture
• /
• v.40 no.4
• /
• pp.149-155
• /
• 2023

Objectives : Hapgok (LI4) is one of the most widely used acupoints in clinical practice. This study aims to investigate the trend of clinical studies including LI4 acupoint stimulation in Korea. Methods : Papers of clinical researches including LI4 acupoint stimulation in Korean journals were searched in Korean databases of Korean Traditional Knowledge Portal, Korean Studies Information Service System, Korea Citation Index, DBpia, Research Information Sharing Service, and ScienceON. The papers were then analyzed focusing on the number of publications by year, the types of the clinical research, interventions, research topics, institutes, and journals. Results : A total of 154 publications were included in this study. The first paper was published in 1981, and the number of papers has gradually increased since the 1990s. Although LI4 acupoint stimulation was included, most of the papers had additional acupoints and interventions. Diseases of the nervous system were the most common, followed by diseases of the digestive system and diseases of the circulatory system. Kyung Hee University is the institution that published the most papers, and the journal that published the most papers is The Journal of Korean Oriental Internal Medicine. Conclusions : Since the 1990s, the number of clinical studies on LI4 acupoint has increased. However, the results of the studies are insufficient to prove the efficacy of LI4 acupoint because most of the studies were case reports using additional acupoints and interventions. Therefore, more rigorous studies are needed to prove the efficacy of LI4 acupoint.

• Journal of the Korea Society of Computer and Information
• /
• v.28 no.5
• /
• pp.57-66
• /
• 2023

In this paper, a research trend of attack graph studies for Cyber-Physical System (CPS) environments is surveyed, and we analyse the limitations of previous works and prospect the future directions. 35 among around 150 attack graph studies conducted within 5 years target CPS, and we inspect key features of CPS environment in the security aspect. Also, we categorize and analyze target studies in the aspect of modelling physical systems and considering air gaps, which are derived as key features of the security aspects of CPS. Half of 20 research that we surveyed do not reflect those two features, and other studies only consider one of the two features. In this circumstance, we examine challenges that attack graph studies on CPS environment face. Finally, we expect state-led studies or studies targeting open-spec commercial CPS will dominate.

• 한국경영정보학회:학술대회논문집
• /
• 2007.06a
• /
• pp.488-493
• /
• 2007

The main goal of this study is to propose a model of simplicity and interactivity effect on usability in the blog services. As web-based applications become increasingly complicated, the need for simplicity in user interface design has grown for better usability. Also, interactivity has been known to influence on usability. Previous studies argued that usability is a key factor for system success. Usability is concerned with attributes of an application that makes it understandable, learnable, easy to use, and attractive. For the complicated technology, perceived control, related to direct manipulation of an object, is important. In this regard, we posit that simplicity, interactivity, and perceived control makes important antecedents to usability. Finally, we tested that the effect of usability on user s loyalty with the blog services along with trust and satisfaction. Future studies will empirically examine the proposed model, emphasizing the importance of simplicity and interactivity for the user interface design.