• KIPS Transactions on Software and Data Engineering
• /
• v.2 no.9
• /
• pp.615-620
• /
• 2013

With the development of smartphones, the number of applications for smartphone increases sharply. As a result, users need to try several times to find their favorite apps. In order to solve this problem, we propose a recommendation system to provide an appropriate app list based on the user's log information including time stamp, location, application list, and so on. The proposed approach learns three recommendation models including Naive-Bayesian model, SVM model, and Most-Frequent Usage model using temporal and spatial attributes. In order to figure out the best model, we compared the performance of these models with variant features, and suggest an hybrid method to improve the performance of single models.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2022.10a
• /
• pp.188-190
• /
• 2022

We propose how to configure the AI education system based on the purpose of hybrid learning and the teaching-learning principle. Based on the four components of hybrid learning, we have designed the system conceptual diagram and DB configuration diagram for on-line and offline learning environments for effective AI education. The proposed AI education system model in this paper is expected to be a foundation for maximizing the effectiveness of AI education according to the level and needs of learners and building a more effective learner-centered learning environment in cultivating computational thinking in AI education.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.9 no.11
• /
• pp.1255-1266
• /
• 2014

This thesis presents MPU module, Base board and sensor module which are efficient industrial control through design and manufacture as developing S5PV210 CPU of SAMSUNG used by ARM Cortex-A8 based on Android which is Open mobile platform is installed to embedded system. Data for temperature and humidity which are received by sensor module proved the suitability and validity for the real time framework design as implementing application program employed the smart phone App with hybrid application based on DB of web server.

• Journal of the Korean Ceramic Society
• /
• v.51 no.3
• /
• pp.162-169
• /
• 2014

This paper introduces a microwave-assisted synthesis method to prepare hybrid $Bi_2Se_3-GR/TiO_2$ nanocomposites, which exhibit superior properties over single component materials. The as-prepared composites were characterized by XRD, UV-vis absorbance spectra, SEM,TEM, EDX, and BET analyses, revealing uniform covering of the graphene nanosheet with $Bi_2Se_3$ and $TiO_2$ nanocrystals. For visible light photocatalysis of Rh.B, a significant enhancement in the reaction rate was consequently observed with $Bi_2Se_3-GR/TiO_2$ composites. The degradation rate($k_{app}$) obtained for sonophotocatalysis was $6.8{\times}10^{-3}min^{-1}$, roughly 2.2 times better than that of VL photocatalysis under higher concentrations of Rh.B. The sonophotocatalysis was faster due to greater formation of reactive radicals as well as an increase of the active surface area of the $Bi_2Se_3-GR/TiO_2$ composites. The high activity is attributed to the synergetic effects of high charge mobility and red shift of the absorption edge of $Bi_2Se_3-GR/TiO_2$.

• Journal of Information Technology Services
• /
• v.12 no.4
• /
• pp.435-447
• /
• 2013

If we use a smartphone to analyze and detect falling, it is a huge advantage that the person with a sensor attached to one's body is free from awareness of difference and limitation of space, unlike attaching sensors on certain fixed areas. In this paper, we suggested effective posture analysis of smartphone users, and fall detecting system. Suggested algorithm enables to detect falling accurately by using the fact that instantaneous change of acceleration sensor is different according to user's posture. Since mobile applications working on smart phones are low in compatibility according to mobile platforms, it is a constraint that new development is needed which is suitable for sensor equipment's characteristics. In this paper, we suggested posture analysis algorithm using smartphones to solve the problems related to user's inconvenience and limitation of development according to sensor equipment's characteristics. Also, we developed fall detection system with the suggested algorithm, using hybrid mobile application which is not limited to platform.

• Proceedings of the Korea Contents Association Conference
• /
• 2015.05a
• /
• pp.441-442
• /
• 2015

현대인들의 건강관리의 인식의 변화와 노령화 인구 증가는 현대 사회의 큰 이슈이다. 몸이 불편하지만 거동이 힘든 환자, 보호자가 항상 곁에 없는 환자, 스스로의 질병관리의 방법을 모르는 환자들이 스마트 기기만 있으면 이용 가능한 만성질환관리 하이브리드 앱서비스를 제안한다. 제안한 하이브리드 앱서비스는 웹페이지를 이용하여 운영체제에 상관없는 서비스 이용이 가능하도록 연구하였다.

• International Journal of Advanced Culture Technology
• /
• v.8 no.3
• /
• pp.325-333
• /
• 2020

In the past, eating outside was usually the purpose of eating. However, it has recently expanded into a restaurant culture market. In particular, a dessert culture is being established where people can talk and enjoy. Each consumer has a different tendency to buy chocolate such as health, taste, and atmosphere. Therefore, it is time to recommend chocolate according to consumers' tendency to eat out. In this paper, we propose a chocolate recommendation application based on the tendency to eat out using data on social networks. To collect keyword-based chocolate information, Textom is used as a text mining big data analysis solution.Text mining analysis and related topics are extracted and modeled. Because to shorten the time to recommend chocolate to users. In addition, research on the propensity of eating out is based on prior research. Finally, it implements hybrid app base.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2016.10a
• /
• pp.738-741
• /
• 2016

다양한 크기의 모바일 기기가 등장함에 따라 기존 웹 어플리케이션으로는 개발자가 의도한대로 레이아웃을 구성하기 어려우며 네이티브 어플리케이션은 운영체제별로 각각 개발해야하기 때문에 많은 개발 시간을 필요로 한다는 단점이 있다. 본 논문에서는 부트스트랩을 이용하여 기기의 화면 크기에 가변적인 반응형 웹을 구축하고 모바일 운영체제의 웹뷰를 이용한 하이브리드 앱을 구현함으로써 개발과정 및 개발 시간 단축을 검증하였다.

• Journal of information and communication convergence engineering
• /
• v.20 no.4
• /
• pp.280-287
• /
• 2022

Recently, the number of mobile ransomware types has increased. Moreover, the number of cases of damage caused by mobile ransomware is increasing. Representative damage cases include encrypting files on the victim's smart device or making them unusable, causing financial losses to the victim. This study classifies ransomware apps by analyzing several representative ransomware apps to identify trends in the malicious behavior of ransomware. We present a technique for recovering from the damage, from a digital forensic perspective, using reverse engineering ransomware apps to analyze vulnerabilities in malicious functions applied with various cryptographic technologies. Our study found that ransomware applications are largely divided into three types: locker, crypto, and hybrid. In addition, we presented a method for recovering the damage caused by each type of ransomware app using an actual case. This study is expected to help minimize the damage caused by ransomware apps and respond to new ransomware apps.

• Journal of the Korea Convergence Society
• /
• v.7 no.1
• /
• pp.31-36
• /
• 2016

Recently with the wide spread smart devices and the flexible forms of work such as working from home due to changes in work practices, people are getting various information easily. Many women with a baby get to be interested in foods, health, and growth of their baby and the new task of raising a baby comes with a new burden added to taking care of their family and can develop into obsessive compulsive disorder to be a great mother. So many mothers suffer from child-rearing stress. Also, as the balance of work and life in mobile environment emerged as an important issue, the need for integrated information management applications that give infant care assistance to new mothers was increased. This study analyzed preferences on infant care information apps and developed prototype apps for infant care information management that can provide integrated customized infant care information that is actually needed.