• The KIPS Transactions:PartC
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• v.15C no.4
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• pp.297-302
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• 2008

In case of display a lot of information from mobile devices, those systems are being developed that display the information from mobile devices on remote devices such as TV using the mobile devices as remote controllers because it is difficult to display a lot of information on mobile devices due to their limited bandwidth and small screen sizes. A lot of cost is required to design and develop interfaces for these systems corresponding to each of remote display devices. In this paper, a mobile environment based remote display system for displays at real times is proposed for continuous monitoring of status data for unique 'Mote IDs'. Also, remote data are collected and monitored through sensor network devices such as ZigbeX by applying status perception based remote displays at real times through processing ubiquitous computing environment data, and remote display applications at real times are implemented through PDA wireless mobiles. The system proposed in this paper consists of a PDA for remote display and control, mote embedded applications programming for data collections and radio frequency, server modules to analyze and process collected data and virtual prototyping for monitoring and controls by virtual machines. The result of the implementations indicates that this system not only provides a good mobility from a human oriented viewpoint and a good usability of accesses to information but also transmits data efficiently.

• Journal of Broadcast Engineering
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• v.20 no.1
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• pp.110-121
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• 2015

The digital app-book is an advanced form of the electronic book (e-book), which attracts a lot of interests by the help of video, sound, sensors and a variety of interactions. As mobile devices have evolved, the demand of digital app-books is also rising substantially. However, the distribution of digital app-book contents is hard to meet the demand because the digital app-book requires a lot of programming cost for the interaction. To resolve this problem, Was verified and implementation as a library function of the interaction between device and user. The proposed library consists of three parts (user action recognition, device action, and content action) and provides various user-device interaction functions by combining methods of each part, which can support source code reusability, easy understanding and availability, and wide expandibility. The library was used in the development of natural science education app-book contents. As a result, it could reduce a lot of code lines and facilitate more rapid app-book development.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.8
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• pp.971-980
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• 2010

In this paper, we present a navigation control algorithm for mobile robots that move in environments having static and moving obstacles. The algorithm includes a global and a local path-planning algorithm that uses $D^*$ search algorithm, a fuzzy logic for determining the immediate level of danger due to collision, and a fuzzy logic for evaluating the required wheel velocities of the mobile robot. To apply the $D^*$ search algorithm, the two-dimensional space that the robot moves in is decomposed into small rectangular cells. The algorithm is verified by performing simulations using the Python programming language as well as by using the dynamic equations for a two-wheeled mobile robot. The simulation results show that the algorithm can be used to move the robot successfully to reach the goal position, while avoiding moving and unknown static obstacles.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.2
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• pp.63-72
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• 2011

Broadcast-based data dissemination has become a widely accepted approach of communication in the mobile computing environment. However, with a large set of data items, the expected delay of receiving a desired data increases due to the sequential nature of the broadcast channel. With the objective of minimizing this wait time, this paper explores the problem of data broadcast over multiple channels. In traditional approaches, data items are partitioned based on their access probabilities and allocated on multiple channels, assuming flat data scheduling per channel. If the data items allocated on the same channel are broadcast in different frequencies based on their access probabilities, the performance will be enhanced further. In this respect, this paper proposes a new broadcast scheduling scheme named two level dynamic programming(TLDP) which can reflect a variation of access probabilities among data items allocated on the same channel.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.9-11
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• 2018

Recently, door locks have become popular. However, it is often more difficult to recognize the vulnerability of the door lock than to recognize it as more convenient and secure than a mechanical key. Therefore, in this study, the function of the door lock was improved and the weak points were reinforced. Door lock is vulnerable to heat when a fire occurs, so that the door may not open. Therefore, the door is automatically opened when the internal temperature of the fire site exceeds a predetermined temperature by attaching a heat sensor. In the room, the door was automatically opened without having to press the password. Through the proposed function, it can be expected to prevent the casualties in case of fire.

• Journal of Korea Multimedia Society
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• v.21 no.11
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• pp.1305-1316
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• 2018

Graphical user interface(GUI) has a very important role to interact with software users. However, designing and coding of GUI are tedious and pain taking processes. In many studies, the researchers are trying to convert GUI elements or widgets to code or describe formally their structures by help of domain knowledge of stochastic methods. In this paper, we propose the GUI elements detection approach based on object detection strategy using deep neural networks(DNN). Object detection with DNN is the approach that integrates localization and classification techniques. From the experimental result, if we selected the appropriate object detection model, the results can be used for automatic code generation from the sketch or capture images. The successful GUI elements detection can describe the objects as hierarchical structures of elements and transform their information to appropriate code by object description translator that will be studied at future.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.5-8
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• 2018

Recently, global warming and tropical nights have caused the use of electric fans to explode. Under these circumstances, running the fan for long periods of time is not only a risk of explosion due to overloading the power but also a small amount of electricity and environmental pollution. Therefore, the research was conducted to develop devices that automatically turn fans on and off according to room temperature, reducing the risk of explosion as well as saving energy. This study suggested that electric fans turn on and off automatically and display temperature in mobile applications. The ability to turn on and off allows the fan to turn on itself if the indoor temperature rises above a certain level. Conversely, if the indoor temperature drops below a certain level, the fan should be turned off. Second, the temperature display function checks indoor temperature through mobile applications. The automatic on/off capabilities proposed in this study could contribute to reducing the risk of explosion and saving energy. However, if the indoor temperature rises above a certain temperature even though there is no one inside, the fan can be turned on. The expectation from this study is that the ability of fans to operate and turn off at appropriate temperatures can reduce the risk of explosion, electrical charges, and environmental pollution.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.149-150
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• 2017

웹 프로그래밍을 공부하는 학생들이 본인들이 만든 웹 페이지를 서버에 호스팅하여 관리하기는 쉽지 않다. 본 논문에서는 스프링 프레임워크를 기반으로 반응형 웹을 개발하고 개발한 웹 페이지를 아마존 웹 호스팅 서비스를 이용하여 호스팅하는 과정을 다룬다. 스프링 프레임워크는 POJO(Plain Old Java Object) 방식의 프레임워크로써 특정한 인터페이스를 구현하거나 상속을 받을 필요가 없어 기존에 존재하는 라이브러리 등을 지원하기에 용이하고 객체가 가벼우며, CSS를 사용한 반응형 웹은 모바일에서도 접근하기 쉬우므로 높은 접근성을 제공한다. 이렇게 개발한 웹 페이지를 호스팅 하여 관리하는 것은 특히 입문단계의 개발자에게 큰 도움이 될 것이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.831-834
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• 2007

유비쿼터스 환경에 대한 관심이 높아짐에 따라 모바일에 관련된 하드웨어 개발은 물론 소프트웨어에 대한 관심도 마찬가지로 높아지고 있다. 소프트웨어에 대해 높아지고 있는 관심 중에서도 자원의 공유 혹은 접근에 대한 보안은 매우 중요한 이슈로 떠오르고 있다. 본 논문에서는 유비쿼터스 소프트웨어를 개발하기 위한 더 나은 프로그래밍 환경을 제공할 수 있는 정책 기술 언어로 작성된 정책 명세에 포함되는 권한의 제어를 위한 접근 제어 규칙(Access Control Rule)과 변화되는 상황을 감지하기 위한 상황 적응 규칙(Adaptation Rule)을 검사하여 규칙 사이의 안전성을 검사하기 위한 방법을 제시한다. 또한 규칙 사이의 안전성을 말하기 위해 사용되는 타입 시스템에 대해서도 설명한다.

• The KIPS Transactions:PartC
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• v.10C no.5
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• pp.585-594
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• 2003

Java card is one of promising smart card platform with java technology. Java card defines necessary packages and classes for Embedded device that have small memory such as smart card Jana card is compatible with EMV that is Industry specification standard and ISO-7816 that is international standard. However, Java card is not offers user authentication protocol. In this paper, We design and implement an user authentication protocol applicable wireless devices based on Java Card using standard 3GPP Specification (SMS), Java Card Specification (APDU), Cryptography and so on. Our Java Card user authentication techniques can possibly be applied to the area of M-Commerce, Wireless Security, E-Payment System, Mobile Internet, Global Position Service, Ubiquitous Computing and so on.