• Journal of Advanced Navigation Technology
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• v.21 no.6
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• pp.620-625
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• 2017

Recently, the solar module for charging internet devices is installed in crowded areas to offers services so that people can charge their smartphones or tablets. But this charging module can not be linked with the information related to a bus approach so people are subject to let their belongings such as smartphone, tablet pc at the bus stop while they are still charging it. This paper proposes a system to inform the smart phone when the bus is accessed by using the LPWA technology and BLE technology to resolve such under-failures. This experimental result showed that the power usage of LPWA based bus entry systems is an average of X, confirming that the long period usage of low-power can be possible for low power consumption in this results, enabling information on the bus to be transmitted to smart phones using Advertising mode of BLE.

• Journal of KIISE:Information Networking
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• v.31 no.2
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• pp.158-170
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• 2004

Mobile IP is a base protocol to support host mobility in IP-based wireless network. It is well known that the protocol contains two main delay factors on a handoff process; one is to detect a host movement, and the other is to register the host's current location to its home network. This paper examines Layer 2(L2) handoff procedure in the IEEE 802.11 Wireless LAN, and identifies these L2 triggers that can be usefully applied to Layer 3(L3) handoff. Then, the MCAA(Multiple-Casting using Anchor Agent) mechanism is proposed. It makes use of the L2 trigger and the network topology to construct an anchor agent dynamically, and the multiple-casting scheme to prevent an ongoing packet to be lost. Using a network simulator, the proposed mechanism has been evaluated the handoff delay and the packet lost point of view, in comparison with the regional registration protocol which is the most well known micro mobility support mechanism.

• Journal of Digital Convergence
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• v.13 no.5
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• pp.205-211
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• 2015

Recently, a mobile communication network and the wireless terminal is suddenly develop, mobile office service is more and more the sportlight. However, the user may receive an attack from a malicious third party if the up/download the data in the remote to perform the work in a mobile office environment. In this paper, we propose scheme to manage the information lost due to theft smartphone that contain spill prevention personal information and company information from the mobile office environment (call history, incoming messages, phonebook, calendar, location information, banking information, documents, etc.). The proposed scheme using the number of triangular fuzzy information about the state of the personal information and business intelligence to implement a pair-wise comparison matrix. In particular, the proposed scheme is to prevent the value obtained by constructing a pair-wise comparison matrix for personal information and business intelligence and pair your smartphone is lost when a third party not allow access to personal information and corporate information is leaked to the outside.

• The Korean Journal of Nuclear Medicine Technology
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• v.27 no.1
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• pp.66-70
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• 2023

Purpose It is intended to improve the management efficiency of personal dosimeters by analyzing and sharing personal dosimeter loss cases and loss prevention measures. Materials and Methods From 2017 to 2021, data on the number of lost personal dosimeters were collected at large hospitals, and the number of personal dosimeters issued and lost were investigated. Results In order to prevent loss by institution, methods such as the use of auxiliary rings, contact stickers and dosimeter necklaces were implemented. Conclusion Hospitals are a business that frequently changes clothes, such as surgical gowns and work clothes, so there is a lot of loss. In addition, it was confirmed that the loss rate increases as the number of personal dosimeters issued increases.

• Journal of Korea Multimedia Society
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• v.17 no.9
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• pp.1098-1103
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• 2014

Smartphone is very much ingrained into our lives and it has propagated rapidly. With the growing expansion of smartphone, the number of lost smartphones has proliferated all the while. Unlike common personal belongings, smartphone is a high-priced goods and has personal information. In case it gets lost or stolen, it will cause monetary damage as well as secondary damage of personal information leaks. To lesson the damage, diverse applications that prevent the loss of a smartphone have been developed. But existing applications place emphasis on providing countermeasures that tracks the missing smartphones. Therefore, this paper describes the design and implementation of a smartphone application which provides precautionary functions to prevent the loss of a smartphone and countermeasures to track the missing smartphone. The implemented application prevents the loss of a smartphone using satefy zone and movement detection. In the event we lose a smartphone, it helps us recover a lost property using location tracking and remote control functions quickly and efficiently.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2001.11a
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• pp.226-229
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• 2001

현재 초소형 정밀기계(MEMS;Microelectromechanical System) 소자의 가장 큰 문제점으로 대두되고 있는 점착현상을 방지하기 위하여 불화유기박막을 증착하였다. Octafluorocyclobutane(C$_4$F$_{8}$)을 소스가스를 PECVD (Plasma Enhanced CVD)와 ICP (Inductively Coupled Plasma)를 이용하여 증착하였다. 여기에 Ar을 첨가하여 플라즈마의 반응성을 높여주었다. 형성된 불화유기박막의 나노트라이볼러지 특성을 살펴보기 위하여 AFM을 통하여 증착시킨 시편의 topography를 살펴보았다. 그리고 박막의 antiadhesion의 정도를 살펴보기 위하여 cantilever와 박막의 표면 사이에 존재하는 interaction force를 측정 하였고 AFM의 force curve mode를 이용하였다 PECVB를 이용하여 증착된 박막은 ICP를 이용한 박막보다 균일하지 못한 박막을 보였으며 attractive force가 강한 것으로 사료된다.

• The Transactions of the Korea Information Processing Society
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• v.3 no.5
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• pp.1170-1178
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• 1996

In this paper, an authentication scheme for network users using smart card is proposed. The network center generates key information and distributes the generated key to the network users safely. It also carries out the verification of the network users to prevent in-proper use caused by stolen of cards. In addition to that the net-work users can change their password in anytime they want. Therefor, we provide more secure and efficient mutual authentication methods.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.01a
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• pp.137-138
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• 2017

본 논문에서는 USB 파일을 보호하기 위한 USB 파일 보호 프로그램을 설계하고 구현한다. USB 파일 암호화 프로그램은 암복호화시 패스워드를 기반으로 하여 사용자 편의성을 고려하고, USB 저장장치의 파일 각각을 패스워드 가반으로 암호화함으로써 파일들의 외부유출을 방지하여 분실 시 보안에 취약했던 USB 저장장치의 안전성을 향상시킨다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.28-30
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• 2012

2010년 이후 국내 스마트폰 보급은 급속히 증가하여 2011년에 이미 스마트폰 가입자수가 2천만명을 넘어서면서 계속하여 증가하고 있으며, '12년 하반기에는 휴대폰 가입자중 79%가 스마트폰을 차지할 것으로 예측하고 있다(마케팅인사이트, '12.02). 이러한 스마트폰의 증가와 함께 스마트폰을 이용한 각종 서비스 및 업무의 비중도 증가하고 있으며, 이에 대한 정보보안의 문제도 이슈화 되고 있다. 특히 스마트폰의 경우 일반 PC와 비교하여 보안에 취약하며, 특히 분실/도난 등으로 인한 개인정보의 유출위험성 또한 높다. 본 연구에서는 국립방재연구원에서 추진중인 스마트 재난피해조사를 바탕으로 정보보안의 현안을 분석하였으며, 스마트폰 내 정보저장에 대한 보안취약을 해결하기 위해서는 MDM(Mobile Device Management)를 이용한 단말의 통제 뿐만 아니라 1차적으로 단말의 접근을 통제할 수 있는 얼굴인식, 지문인식 등의 인체인식기술과 저장된 정보의 해킹으로 인한 유출을 방지하기 위한 복호화 및 자동삭제 기능 등을 도입하여야 할 것으로 판단된다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.623-628
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• 2008

소프트웨어 업 데이트를 위한 업데이트 코드 전파 기법은 매우 중요한 기술 중 하나이다. 본 논문에서는 네트워크 코딩 기법을 이용한 새로운 업데이트 코드 전파 기법을 제안한다. 제안된 코드전파 기법은 기존의 파이프라이닝 방식에 비해 데이터 송수신 횟수에 있어 약 49%의 성능 향상을 보인다. 따라서 본 논문에서 제안한 코드 업데이트 기법을 사용할 경우 속도, 에너지, 네트워크 혼잡도 측면에서 효율적인 소프트웨어 업데이트를 수행할 수 있다. 뿐만 아니라 본 논문에서 제안한 방식은 네트워크 코딩의 overhearing 문제점인 원본 데이터의 분실이나 데이터의 미 수신시 발생하는 디코딩문제를 미리 정의된 메시지를 이용, 방지함으로써 신뢰성있는 데이터 전송을 가능하게 한다.