• Journal of Digital Convergence
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• v.17 no.10
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• pp.13-21
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• 2019

The restricted network or the unbalanced distribution of spectrum is causing the problems of lack of spectrum resources and deterioration of the service quality. In addition, the existing centralized radio sharing method has not been a fundamental solution for radio sharing and is inefficient in terms of cost, convenience, and security. In this paper, we propose a blockchain-based spectrum sharing as a low-cost, trustworthy, high-efficiency platform that can distribute and share spectrum resources, and propose policies to realize this. In the spectrum sharing platform, spectrum information about Wi-Fi AP and LTE mobile hotspot is registered in the blockchain, and spectrum sharers and users can conclude peer-to-peer spectrum sharing contract quickly and efficiently through smart contract. The pay for the shared spectrum resources and reward for spectrum quality management open platform ecosystem to activate the circulation-sharing and it can provide a convenient and efficient public wireless infrastructure.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.835-838
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• 2013

국토해양부에서는 전국 도로표지의 효율적인 관리를 위해 국내 300여개 도로표지 관리기관에서 도로표지업무에 활용할 수 있도록 2001년 웹 기반의 도로표지전산관리시스템을 구축하였고, 2003년 도로표지종합관리센터를 설립하여 지속적으로 운영해오고 있다. 이는 네트워크 기반의 도로망도 상에서 전국 도로표지를 연계하여 관리할 수 있어 도로표지의 안내 연결성 확보 등 국내 도로표지 관리업무에 많은 부분 기여해 왔다. 최근 들어서는 모바일 환경이 구축되면서 인터넷이 연결된 사무공간 외에 현장에서도 시스템을 활용하고자 하는 요구가 증가하게 되었다. 따라서 도로표지종합관리센터에서는 도로표지전산관리시스템 이용자들의 편의를 증진하기 위하여 현장지원을 위한 도로표지 모바일 어플리케이션을 개발하였다. 모바일 어플리케이션은 스마트폰, 스마트패드 등 3G/4G/Wi-Fi 등 무선통신이 가능한 다양한 모바일 스마트 기기를 활용하여 도로표지전산관리시스템의 기능을 현장에서 활용할 수 있도록 하였으며, 현장이라는 공간 특성을 반영하여 쉽고 간단하게 기능을 구현하였다는 데 특징이 있다. 이를 통해 도로표지 담당자들은 언제 어디서든 도로표지 정보의 조회가 가능하고, 현장조사 시 표지 사진과 관련 정보를 수집하여 현장에서 즉시 도로표지전산관리시스템에 표지정보를 입력하거나 수정 할 수 있다. 현재는 모바일 어플리케이션 버전 1.0이 개발된 상태이며, 향후 다양하고 반복적인 사용자 활용 패턴을 면밀히 분석하여 보다 사용하기 쉽게 도로표지전산관리시스템 기능을 사무공간에서와 같이 모바일 어플리케이션도 사용할 수 있도록 지속적으로 개선해 나가고자 한다.

• KIPS Transactions on Computer and Communication Systems
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• v.12 no.6
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• pp.197-208
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• 2023

In the coming future, anyone using the Internet will have more than one NFT. Unlike FT, NFT can specify the owner, and tracking management is easier than FT. Even in the 2022 survey, WPA2 is the most widely used wireless protocol worldwide to date. As it is a protocol that came out in 2006, it is a protocol with various vulnerabilities at this time. In order to use WPA2-EAP or WPA3 (2018), which were released to compensate for the vulnerabilities of WPA2, additional equipment upgrades are required for STA (station) and AP (access point, router), which are connected devices. The use of expensive router equipment solves the security part, but it is economically inefficient to be introduced in Small Office Home Office (SOHO). This paper uses NFT as a means of authentication and uses the existing WPA2 as it is without equipment upgrade, defend crack tools of WPA2 that have been widely used so far and compared to the existing WPA2, it was shown that it was not difficult to actually use them in SOHO.

• Journal of Cadastre & Land InformatiX
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• v.48 no.2
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• pp.109-119
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• 2018

Point of interest (POI) of the city is a special place that has what importance to the user. For example, it is such landmark, restaurants, museums, hotels, and theaters. Because of its role in the social and economic life of us, these have attracted a lot of interest in location-based applications such as social networks and online map. However, while it can easily be obtained through the Web, the basic information of POI such as geographic location, another effort is required to obtain detailed information such as Wi-Fi, accepting credit cards, opening hours, romper room and the assessment and evaluation of other users. To solve these problems, a new method for correcting position error is required to link location-based social network service (LBSNS) data and POIs. This paper attempts to propose a position error correction method of POI and LBSNS data to enrich POI information from the vast information that is accumulated in LBSNS. Through this study, we can overcome the limitation of individual POI information via the information fusion method of LBSNS and POI, and we have discovered the possibility to be able to provide additional information which users need. As a result, we expect to be able to collect a variety of POI information quickly.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.740-748
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• 2016

IT and communication technologies has contributed significantly to the convenience of passengers and the financial management of stations in accordance with the task automation in the field of the urban railway system. The foundation of the above development is based on the large amounts of data from various sensors installed in railways, trains, and stations. In particular, the sensor network that is installed in the station and train has played an important role in the railway information system. The performance of AP is affected by the number of APs and their locations installed in the station. In the installation of APs in stations, the intensity of the radio wave of the AP on its underlying position is considered to determine the number and position of APs. This paper proposes a method to estimate the number of APs and their position based on the structure of the underlying station and implemented a simulator to simulate the performance of the proposed method. The implemented simulator was applied to the decision of AP installation at Busan Seomyeon station to evaluate its performance.