• 한국농촌건축학회논문집
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• 제24권4호
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• pp.1-8
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• 2022

This study aims to investigate the gap in accessibility to urban planning facilities between living spheres in local small and medium-sized cities. In this study, OD data between administrative dongs of public transportation users was constructed to analyze the living shpere, and community analysis was conducted based on cohesion between data. As a result of the analysis, it was confirmed that a total of 10 clusters (mid-living areas) were formed, and the topographical difference between the 11 middle living areas established in the existing Jinju City Basic Plan and the single living areas were actively exchanged to form a community with other administrative dongs. Next, the analysis of the service area of urban planning facilities for mid-living areas was conducted based on the road network. As a result of analyzing the area accessible within 5, 10, and 15 minutes, educational facilities, public facilities, cultural facilities, tourism, and green facilities could be reached within 15 minutes in most mid-living areas. On the other hand, there were many areas where access to transportation facilities, medical facilities, and cultural facilities was difficult within 15 minutes. In particular, the accessibility of the outer living area and the central living area were different. To improve the quality of life of citizens, using urban planning facilities in Jinju-si and establishing related plans in urban basic plans, it is necessary to conduct a study on service areas through network analysis.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권12호
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• pp.5669-5684
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• 2018

The new mobile edge network architecture has been required for an increasing amount of traffic, quality requirements, advanced driver assistance system for autonomous driving and new cloud computing demands on highway. This article proposes a hierarchical cloud computing architecture to enhance performance by using adaptive data load distribution for buses that play the role of edge computing server. A vehicular dynamic cloud is based on wireless architecture including Wireless Local Area Network and Long Term Evolution Advanced communication is used for data transmission between moving buses and cars. The main advantages of the proposed architecture include both a reduction of data loading for top layer cloud server and effective data distribution on traffic jam highway where moving vehicles require video on demand (VOD) services from server. Through the description of real environment based on NS-2 network simulation, we conducted experiments to validate the proposed new architecture. Moreover, we show the feasibility and effectiveness for the connected car media service on highway.

• 한국정보통신학회논문지
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• 제17권3호
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• pp.740-746
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• 2013

사물통신은 사람 대 사물, 사물 대 사물간 지능통신 서비스를 언제 어디서나 안전하고 편리하게 실시간으로 이용할 수 있는 융합 ICT 기반이다. 사물통신 플랫폼은 다양한 장치와 센서를 통해 사물의 정보를 취득 또는 생성하는 M2M 현장 네트워크, 이를 전달하는 광대역 무선 통신망, 수집된 정보를 가공, 활용하는 응용서비스들의 3요소로 구성된다. 본 논문에서는 WCDMA 기반의 M2M 통신망과 지그비 또는 Wi-Fi 기반의 USN을 상호 연동하는데 현실적으로 걸림돌이 되는 두 가지 문제, 즉 WCDMA 망의 요금 문제와 게이트웨이 문제를 해결하기 위한 PWW(Person Wide Web) 기반의 M2M 플랫폼을 설계하고 개발하였다. 개발한 USN 게이트웨이를 통해 USN 기반 현장 네크워크와 응용서비스 단말로써의 스마트폰을 직접 연동시킴으로써 WCDMA 무선망 접속을 최소화하여 위에서 언급한 두 가지 현실적 문제를 회피할 수 있음을 보였다.

• 한국비블리아학회지
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• 제29권2호
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• pp.35-56
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• 2018

본 연구는 공공데이터 포털을 통해 개방된 도서관 관련 데이터의 현황을 다각도로 살펴보며, 공개된 데이터의 수준과 공개 주체에 따라 데이터의 활용 정도에 어떠한 차이가 나타나는지 분석하였다. 또한 데이터의 공개주체를 지방자치단체와 국가 및 공공기관으로 구분하여 데이터에 부여된 키워드를 활용해 PathFinder Network 분석을 수행함으로써 양 주체가 공개한 데이터의 주제 군집과 중심성에 어떠한 차이를 보이는지 분석하였다. 그 결과 국가 및 공공기관이 공개한 데이터로부터는 연구자료 등을 중심으로 4개의 주제군집이, 지방자치단체가 공개한 데이터로부터는 소장자료, 평생교육프로그램 등을 중심으로 8개의 주제 군집이 형성되었으며, 국가 및 공공기관이 공개한 데이터가 학교 및 공공도서관의 단순 현황을 주로 공개하고 있는 지방자치단체 공개 데이터보다 높은 활용도를 나타냈다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권12호
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• pp.4643-4660
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• 2014

Integrity authentication of biometric data in Wireless Body Area Network (WBAN) is a critical issue because the sensitive data transmitted over broadcast wireless channels could be attacked easily. However, traditional cryptograph-based integrity authentication schemes are not suitable for WBAN as they consume much computational resource on the sensor nodes with limited memory, computational capability and power. To address this problem, a novel lightweight integrity authentication scheme based on reversible watermark is proposed for WBAN and implemented on a TinyOS-based WBAN test bed in this paper. In the proposed scheme, the data is divided into groups with a fixed size to improve grouping efficiency; the histogram shifting technique is adopted to avoid possible underflow or overflow; local maps are generated to restore the shifted data; and the watermarks are generated and embedded in a chaining way for integrity authentication. Our analytic and experimental results demonstrate that the integrity of biometric data can be reliably authenticated with low cost, and the data can be entirely recovered for healthcare applications by using our proposed scheme.

• 한국환경과학회지
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• 제25권1호
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• pp.181-190
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• 2016

Regional air quality regulation is a system that allows the Minister of Environment to designate the local area as air quality control region where the concentrations of air pollutants are exceeding the environmental standards, and the local governments that administrate the regulated area have to develop and practise a plan for reducing the air pollutants. From the data observed yearly by the monitoring stations in 8 provincial cities with more than 0.5 million people was judged the compliance with air quality standards in each municipality for the period of 2003 to 2013. As the result of investigation on air pollutants concentrations of each city, it was found that there was no station that exceeds the ambient air quality standards of CO, $SO_2$ and 24-hour $NO_2$. But all municipalities exceeded the standards of 8-hour $O_3$, annual and 24-hour $PM_{10}$, and therefore 8 municipalities can be designated to be under the local air regulation. For the annual $NO_2$ were the monitoring sites necessary requirements for designation of the air quality regulation region in Cheongju, Cheonan, Daejeon and Gwangju area. Incase of 1-hour $O_3$, some of stations in Pohang, Cheongju, Cheonan and Changwon area were over the designation standards for the air quality control region.

• 대기
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• 제29권2호
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• pp.183-196
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• 2019

High-quality and high-resolution meteorological information is essential to reduce damages due to disastrous weather phenomena such as flash flood, strong wind, and heat/cold waves. There are many meteorological observation stations operated by Korea Meteorological Administration (KMA) in Seoul Metropolitan Area (SMA). Nonetheless, they are still not enough to represent small-scale weather phenomena like convective storm cells due to its poor resolution, especially over urban areas with high-rise buildings and complex land use. In this study, feasibilities to use additional pre-existing networks (e.g., operated by local government and private company) are tested by investigating the effects of network density on the gridded horizontal distribution of two meteorological variables (temperature and precipitation). Two heat wave event days and two precipitation events are chosen, respectively. And the automatic weather station (AWS) networks operated by KMA, local-government, and SKTechX in Incheon area are used. It is found that as network density increases, correlation coefficients between the interpolated values with a horizontal resolution of 350 m and observed data also become large. The range of correlation coefficients with respect to the network density shows large in nighttime rather than in daytime for temperature. While, the range does not depend on the time of day, but on the precipitation type and horizontal distribution of convection cells. This study suggests that temperature and precipitation sensors should be added at points with large horizontal inhomogeneity of land use or topography to represent the horizontal features with a resolution higher than 350 m.

• 전기전자학회논문지
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• 제25권4호
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• pp.762-765
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• 2021

본 논문에서는 자동차의 위치 및 자세 추정에 사용되는 칼만 필터 가속기를 내장한 차량용 ECU(electronic control unit)를 설계하고 구현하였다. 프로세서 코어는 RISC-V를 사용하였으며 칼만 필터의 행렬 연산을 수행하는 가속기, 차량 내 통신에 사용되는 CAN(controller area network) 제어기, 센서 연결에 사용되는 LIN(local interconnect network) 제어기를 내장하였다. 칼만 필터 연산은 시간 업데이트와 측정 업데이트의 두 단계로 나뉘며 시간 업데이트 단계에서는 현재 상태변수와 오차 공분산을 예측하고 측정 업데이트 단계에서는 입력값을 받아 칼만 이득을 계산하여 값을 보정한다. 보통 소프트웨어에서는 곱셈에 부동소숫점 연산을 사용하지만 본 논문에서는 하드웨어 면적을 줄이기 위해 정밀도 분석을 고려한 고정소숫점 곱셈기를 사용하였다. 설계된 ECU는 Verilog HDL을 이용하여 검증하였으며 28nm 실리콘 공정으로 구현하였다. 28nm 실리콘 공정으로 구현하였을 때 동작 주파수는 100MHz, 면적은 0.37mm², 게이트 수는 76만 게이트였다.

• 한국수자원학회논문집
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• 제40권4호
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• pp.287-297
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• 2007

DEM을 이용하여 국부경사와 기여면적 사이의 규모에 따른 거동특성을 조사하여 면적한계기준과 경사-면적한계 기준이 상호보완적인 형태의 수로망 추적절차를 제시하였다. 상기방법과 현장자료에 대한 적용을 통하여 유역의 경사는 공간적으로 대규모의 산포경향을 갖는 지형인자임을 확인할 수 있었다. 양자의 규모에 따른 거동특성권역에 따라 지면의 형상은 발산지형과 수렴지형으로 분류될 수 있었다. 본 연구에서 제시한 수로망 동정 절차를 설마천 시험 유역에 대하여 수행한 결과 유역의 동적 거동을 확인할 수 있었다. 또한 이로부터 지형도를 이용한 수작업에 기초한 방법에 비하여 하천두부의 거동과 수로망의 동적특성을 잘 표현하고 있음을 볼 수 있었다.

• 대한전기학회논문지:시스템및제어부문D
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• 제52권8호
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• pp.443-451
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• 2003

Many attempts have been made for the health and lives of patients at a remote site. but little attention has been given to emergency system using wireless or other intelligent networks. In this paper, shown is a remote emergency system which can be used in an ambulance. It possibly gives a great help to the patients who may lose their lives, in other words, gives pre-hospital cure to them being sent to the hospital. Doctors or specialists are able to give a quick help which may give a new life to patients. This system deal with very important patient's data-ECG, SpO$_2$, blood pressure, biomedical signal data etc. - as other emergency system. A good performance better than other system is many but shortly spoken as follows. First, this system is user friendly system activated in windows 2000 environment. Second, MPEG4 and ECG data sent to the other station for specilists can give a pre-hospital cure to patients in advance. Third, there exist effective algorithms to operate this system. Fourth, this system has been made with software mostly, so this system can be easily embedded in IBM compatible computer. In addition to this performance, for the better and reliable system, various tests were proceeded and recursively tested. Tests were made in EV-DO wireless network and Local Area Network. This mobile-fixed remote emergency system using wireless network like EV-DO network will give a great usage to needed area.