• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.6
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• pp.1491-1498
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• 2017

As the use of smartphones and the launch of various apps have increased rapidly, the number of malicious apps has also increased, and the damage is continuing. The Google Market where Android apps are registered is inevitably present at the same time as normal apps and malicious apps even though there are regulations for app registration. Especially, as social networks are activated, users are connected with social networks, and the ratings, downloads and awareness information are reflected in the number of downloaded apps. As a result, when users choose their apps by simply reflecting ratings, popularity, popular comments, and highly-categorized apps, malicious app downloads can sometimes cause significant harm. Therefore, this study first analyzed the tendency of malicious apps by directly crawling and analyzing long-term social information in the currently active Android market.

• The KIPS Transactions:PartC
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• v.18C no.3
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• pp.151-156
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• 2011

Google Android, which is one of the popular smart phone platforms, employs a security model based on application permissions. This model intends to reduce security threats by protecting inappropriate accesses to system resources from applications, but this model has a few problems. First, permission requested by an application cannot be granted selectively. Second, once the permission has been granted it is maintained until the application is uninstalled. Third, applications may acquire powerful permissions through user ID sharing without any notice to users. In order to overcome these limitations, we designed and implemented a flexible application permission management scheme. The goal of our scheme is to enhance security and user convenience while keeping compatibility to original platform. We also verified the operation of our scheme with real applications on Android emulator.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.22 no.5
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• pp.1145-1157
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• 2012

Google Android employs a security model based on application permissions to control accesses to system resources and components of other applications from a potentially malicious program. But, this model has security vulnerabilities due to lack of user comprehension and excessive permission requests by 3rd party applications. Broadcast intent message is widely used as a primary means of communication among internal application components. However, this mechanism has also potential security problems because it has no security policy related with it. In this paper, we first present security breach scenarios caused by inappropriate use of application permissions and broadcast intent messages. We then analyze and compare usage patterns of application permissions and broadcast intent message for popular applications on Android market and malwares, respectively. The analysis results show that there exists a characteristic set for application permissions and broadcast intent receiver that are requested by typical malwares. Based on the results, we propose a scheme to detect applications that are suspected as malicious and notify the result to users at installation time.

• Journal of the Korean Association of Geographic Information Studies
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• v.18 no.3
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• pp.102-112
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• 2015

In this paper we propose an application that can help you to find a school near you easily using smart phone GPS capabilities and Google map mounted on Android system. We use a shortest path algorithm to search near destinations. You can take advantage of the developed application when finding public places or destinations. Schools have usually been used as places for disaster evacuation, entrance examination, and qualifying examination. Even though you are not the young who use the smart phone easily, anyone can find a destination school easily with the proposed application of this paper.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.953-955
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• 2010

Most domestic educational mobile contents put special stress on learning foreign languages such as English, and usually the telecommunications companies and the education companies partner to provide mobile terminals with the contents such as video files. Recently the trend of mobile platforms for the educational contents have been changed because of the release the many kinds of smart phones like iPhone and Google Phone. In this paper, we design the educational contents for Korean listening education to aid to study Korean effectively as a foreign language. It carries out a detailed design to realize and run the contents based on the Android OS which is an open source platform backed by Google.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.83-86
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• 2015

기존의 스트리트 뷰 이미지들은 일일이 사용자가 검색해야 하며 이미지 파일을 하나씩 클릭해서 넘겨 봐야한다는 점과 제공되는 스트리트 뷰 이미지들이 웹페이지 형태로만 제공된다는 불편함이 있었다. 이를 개선하고자 본 논문에서는 스트리트 뷰 이미지를 동영상으로 제공하여 쉽게 길을 찾아갈 수 있는 방법을 제안한다. 본 논문에서 제안하는 어플리케이션은 사용자가 출발지와 도착지를 입력하면 Google Maps APIs를 이용해 최단경로를 받아온다. 그 후 최단경로에 해당하는 좌표값에 해당하는 이미지를 Google Maps APIs URL을 이용하여 Android 내부 DB로 받아온다. 마지막으로 DB에 저장된 이미지를 동영상으로 변환하여 제공한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.556-558
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• 2010

Most of the domestic educational mobile contents are concentrated on learning foreign languages like English and it's common to provide contents with mobile cellphone under partnership between mobile and education companies. In recently, the trend is that the mobile platform of educational contents is changing according to development of various smart phones like I-phone and Google-phone. In this paper, so, we implement listening contents for Korean education to support learning Korean as foreign language effectively. In detail, we implement the operation of contents based on android OS of Google open-type platform of smart phone.

• Journal of Korea Society of Industrial Information Systems
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• v.16 no.5
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• pp.45-54
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• 2011

Currently various applications related to bus route are used on smart devices to obtain bus arrival times, and route information. However, applications are unable to provide various ways for users to provide their destination. This study has designed an algorithm based on user's six patterns. An Android application and a server that communicate with each other have been based on the algorithm. The applications and the server use the Google Maps service and location-based information to provide users with possible routes from the starting place to the destination. They also provide user's with users' current position and any transfer information. They provide practical and efficient information, and are easy to use.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.100-101
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• 2012

According to growing the leisure boat market, safety-related and weather information have been required by different users with different electronic devices. NAVTEX messages transmitting worldwide from local stations are a kind of useful service, even for non mandatory carriage requirement vessel, such as small or fishing vessels. However, it is not easy for all users to recognize intuitively. This paper is to implement the NAVTEX message on tablet PC, indicating warning positions of message on Android-based google map.

• International journal of advanced smart convergence
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• v.5 no.3
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• pp.16-26
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• 2016

This proposed project is about a bicycle anti theft devised system which helps people protect the bicycle from theft and helps to track the stolen bicycle's location using a smart phone. Safety bike uses two main devices to keep the bicycle secured, the vibration sensor and GPS sensor. The purpose of this project is to put all these small devices into one well connected system which will help the bicycle owner have more control over the security of his own bicycle. The whole system can be divided into two main parts. The first part is about the hardware development whereby all electronics components are connected via the circuit design using wire wrapping technique. This hardware part includes, a vibrations sensor, a GPS receiver, a toggle switch, LED light, Bluetooth and a buzzer. Wireless Bluetooth signals are used as the means of communication between the smartphone and the microcontroller. The second part is the software part which is being to program and control the whole system. The program is written using MikroBasic, a full-featured Basic compiler for microcontroller based systems. In conclusion, this system is designed to enable user to have control in securing his/her bicycle also being able to find and locate it at any time using GPS receiver and mobile android application.