• Journal of the Institute of Convergence Signal Processing
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• v.16 no.3
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• pp.102-107
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• 2015

Personal information leakage is one of the great recent issues, which can be caused by hacking or censorship when a messenger program is used between user groups in Android-based smartphones, In order to solve these problems, companies generally apply complex security procedures inside the messenger, but which degrade the efficiency of work. This paper proposes a method which can improve work efficiency and strengthen security by allowing only the clients that can access a particular AP, and implementing a closed messenger group. The proposed method is validated by implementing on the Android-based smartphones.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.363-364
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• 2015

On the area which is restricted an unauthorized WiFi service, mobile WiFi hotspot causes security problems like leaking and gathering internal data. In this paper, we modify a wireless lan driver and implement a detector that periodically scans the wireless channels.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.1
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• pp.1-8
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• 2014

This paper proposed a method that prevents data leakage and modulation and detects an unauthorized device by using AP and mobile device. Most of existing method for detecting and preventing an unauthorized device are similar to type of Evil Twin. However, in previous studies can not resolve many security accident and have the problem to cope with effectively security accident on various network. In order to solve these problem, companies prepare security accident through the varies policy and guideline. but It is hard to prevent all security accident because it is consistently increasing everyday. This paper suggests technique of detecting and preventing an unauthorized device using Context Awareness and Mobile Device Management. Firstly, when mobile device go into internal network, server distinguish access permission and authorization of mobile device using acquiring the conetxt information of mobile device. By using this result, server applies the appropriate management technique to the mobile device for leakage and accident of internal network.

• KIPS Transactions on Computer and Communication Systems
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• v.3 no.11
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• pp.393-402
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• 2014

We have experienced an explosive increase of the IoT(Internet of Things) technology based devices including smart phones and the wireless communications. Also the growing power consumption in IEEE 802.11 WLANs(Wireless LANs) driven by these dramatic increases in not only mobile users and but also wireless APs(Access Points). To reduce the power consumption, this paper proposes a wireless AP power saving algorithm, which minimizes the transmission power without decrease the transmission and carrier sense ranges. A wireless AP which is use in our algorithm checks its own original coverage periodically for whether there is a new STA(Station) or not when its transmission power is decreased. Moreover, if there are no signaling message to connect the wireless AP, it changes its operation mode Wake-up to sleep. A Result shows that the proposed AP algorithm can reduce the total power consumption of the wireless AP approximated 18% and 35% compared to the conventional wireless AP with and without the existing power saving algorithm, respectively.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.5
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• pp.927-934
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• 2019

Recently, mobile devices have evolved into small computers with various functions according to user requirements. Careful attention must be paid to the design of the power supply network for the stable operation of the application processor (AP), the wireless communication modem, the high performance camera, and the various interfaces of the mobile device to implement various functions of the mobile device. In this paper, we analyzed and verified the method of optimizing the design parameters such as the position, capacity, and number of decoupling capacitors to meet the target impedance required by the driver IC chip to ensure the stability of the power supply network of mobile devices that should be designed as wiring type due to mounting density limitation. The proposed wired power supply network design method can be applied to various applications including high-speed signal transmission line in addition to mobile applications.

• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.235-236
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• 2010

본 논문에서는 블루투스 노드와 블루투스 AP(Access Point)를 이용하여 영화관, 기차역, 은행, 관공서 등의 다양한 장소의 키오스크 서버(Kiosk Server)에 모바일 기기로 원격으로 접속한다. 이때 모바일 단말기기는 사용자의 입력과 출력만을 담당하고 키오스크 서버는 전달된 데이터를 처리하여 사용자에게 전달하는 Profile의 프레임워크를 설계 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.851-853
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• 2013

Recently, location-based service as the developed continuously, interest in positioning technology is increasing. As the most famous indoor positioning technology, WPS is a positioning technology using WiFi, which can complement the limits of the indoor positioning to have a GPS. In this paper, to provide a system for monitoring the position of the inside of the user based on the position information that using the RSSI signal of the wireless AP based WPS technology, they grip the location information of the mobile nodes in the indoor. If using the method proposed, it is expected to be applied to various services it is possible to apply the WPS, this is because it is possible to estimate in real time the location distribution of mobile nodes in the indoor.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.46-48
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• 2002

본 논문에서는 임베디드 시스템과 웹서버 그리고 모바일로 구성되어지는 대형 중고자동차 관리 시스템을 설계 및 구현하는 방법을 소개하고, 임베디드 시스템 내부에서는 RFID와 서버로 연결되는 네트워크의 설계를 소개하며, 모바일 장치에서의 관리와 현장의 임베디드 시스템과의 동기화 설계에 대해 논의한다. 하드웨어는 MPC860CPU 50MHz를 갖춘 XN860Core보드 및 Access Point는 ORINOCO AP-500을 사용하였으며, 임베디드 시스템의운영체제는 HardHat Linux2.0JE를 사용하였다 중고자동차 관리시스템은 관리에서 영업까지필요한 기능을 구현할 수 있도록 설계하였으며, 향후 다른 분야로 응용할 수 있도록 설계하였다.

• Journal of KIISE:Information Networking
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• v.36 no.3
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• pp.256-262
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• 2009

In this paper, we propose a mechanism for increasing the handover performance of the IEEE 802.11 link layer. The mechanism reduces the number of scanning channels by referencing an AP map based on GPS. Also, by monitoring the SNRs of the mobile node and neighbor APs, it enables the handover to maintain a higher SNR than a given threshold. The experimental results establish that it has a disconnection ratio of 6.7% and an average SNR of 16.8 dB. It is 4.1% lower disconnection ratio and 26% higher SNR than the mechanism used by MadWifi.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11c
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• pp.1997-2000
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• 2003

오늘날 무선 LAN이 집안 또는 사무실, 산업현장, 공항 등과 같이 어디서나 무선으로 인터넷을 이용할 수 있게 설치되어 있다. 이런 무선 LAN 사용이 늘어나는 반면 보안상 결함을 해결할 보안 기능이 절실히 요구되는 실정이다. 본 논문에서는 무선 LAN환경에서 데이터를 안전하게 인증할 수 있는 효율적인 인증 Protocol을 제안한다. 여기서는 단일 Bit를 패킷에 추가하여 AP에서 확인 인증하는 방식을 채택하는데, 기존 방식과는 달리 AP에서 인증 스트림 동기화를 위한 작업을 수행한다. 컴퓨터 시뮬레이션이 최대 50%까지 기존 방식 보다 인증 스트림을 더 사용할 수 있게 하는 것을 보여주고 모바일 호스트의 전력 소모도 최소화한다.