• 디지털융복합연구
• /
• 제12권8호
• /
• pp.211-217
• /
• 2014

본 논문은 지오펜싱 기술을 이용하여 관광객이 이동하려는 지역을 설정하고 설정된 지오펜스 영역 안에 관광객의 스마트폰이 들어가면 스마트폰의 메일 또는 SMS로 알람을 보내고 해당지역의 상세한 지도를 표시하여 찾아 가는 가이드 역할을 한다. 목적지의 박물관 또는 전시물에 도착하면 전시물들마다 NFC 태그를 부착하여 해당 전시물에 대한 자세한 설명을 웹서버로 부터 다운받아서 기존의 단순 전시물에 대한 설명을 멀티미디어 콘텐츠를 이용하여 전시 공간의 미디어화 및 관광객 사이의 상호작용을 할 수 있는 관광안내시스템을 구축하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제7권5호
• /
• pp.1077-1093
• /
• 2013

This paper proposes a new network coordinator node design to select the most suitable wireless technology for WBANs by using fuzzy logic. Its goal is to select a wireless communication technology available considering the user/application requirements and network conditions. A WBAN is composed of a set of sensors placed in, on, or around human body, which monitors the human body functions and the surrounding environment. In an effort to send sensor readings from human body to medical center or a station, a WBAN needs to stay connected to a local or a wide area network by using various wireless communication technologies. Nowadays, several wireless networking technologies may be utilized in WLANs and/or WANs each of which is capable of sending WBAN sensor readings to the desired destination. Therefore, choosing the best serving wireless communications technology has critical importance to provide quality of service support and cost efficient connections for WBAN users. In this work, we have developed, modeled, and simulated some networking scenarios utilizing our fuzzy logic-based NCN by using OPNET and MATLAB. Besides, we have compared our proposed fuzzy logic based algorithm with widely used RSSI-based AP selection algorithm. The results obtained from the simulations show that the proposed approach provides appropriate outcomes for both the WBAN users and the overall network.

• 조명전기설비학회논문지
• /
• 제13권3호
• /
• pp.129-139
• /
• 1999

본 논문에서는 배전용변압기의 원격감시용 시스템 구축 및 운영기술을 제시하였다. 특히 이 시스템에서 사용하는 통신매체로서는 전력회사의 주요 배전선에 시설되어있는 CATV전송망을 활용하였다. 이 시스템은 배전용 변압기 2차전압, 전류를 측정하는 센서부분, 데이터의 부호와 및 해독을 담당하는 RF모뎀부분, 데이터를 송·수신하는 통신 매체부분, 그리고 모니터링된 계측데이터를 변화하는 서버부분 등 4개 주요요소로 구성되어 있다. 또 한 각 요소의 구성에 대한 기능과 개발과정을 기술하였으며, 중부지점의 실계통에 적용함으로써 본 논문에서는 제안한 시스템의 신뢰성과 효과성을 검증하였다.

• 산경연구논집
• /
• 제9권5호
• /
• pp.25-35
• /
• 2018

Purpose - The purpose of this paper is to partition a last-mile delivery network into zones and to determine locations of last mile delivery centers (LMDCs) in Bangkok, Thailand. Research design, data, and methodology - As online shopping has become popular, parcel companies need to improve their delivery services as fast as possible. A network partition has been applied to evaluate suitable service areas by using METIS algorithm to solve this scenario and a facility location problem is used to address LMDC in a partitioned area. Research design, data, and methodology - Clustering and mixed integer programming algorithms are applied to partition the network and to locate facilities in the network. Results - Network partition improves last mile delivery service. METIS algorithm divided the area into 25 partitions by minimizing the inter-network links. To serve short-haul deliveries, this paper located 96 LMDCs in compact partitioning to satisfy customer demands. Conclusions -The computational results from the case study showed that the proposed two-phase algorithm with network partitioning and facility location can efficiently design a last-mile delivery network. It improves parcel delivery services when sending parcels to customers and reduces the overall delivery time. It is expected that the proposed two-phase approach can help parcel delivery companies minimize investment while providing faster delivery services.

• 제어로봇시스템학회논문지
• /
• 제12권6호
• /
• pp.539-546
• /
• 2006

The Air Quality Sensor(AQS), located near the fresh air inlet, serves to reduce the amount of pollution entering the vehicle cabin through the HVAC(heating, ventilating, and air conditioning) system by sending a signal to close the fresh air inlet door/ventilation flap when the vehicle enters a high pollution area. The sensor module which includes two independent sensing elements for responding to diesel and gasoline exhaust gases, and temperature sensor and humidity sensor was designed for intelligent AQS in automobile. With this sensor module, AVR microcontroller was designed with back propagation neural network to a powerful gas/vapor pattern recognition when the motor vehicles pass a pollution area. Momentum back propagation algorithm was used in this study instead of normal backpropagation to reduce the teaming time of neural network. The signal from neural network was modified to control the inlet of automobile and display the result or alarm the situation in this study. One chip microcontroller, ATmega 128L(ATmega Ltd., USA) was used for the control and display. And our developed system can intelligently reduce the malfunction of AQS from the dampness of air or dense fog with the backpropagation neural network and the input sensor module with four sensing elements such as reducing gas sensing element, oxidizing gas sensing element, temperature sensing element and humidity sensing element.

• 지역연구
• /
• 제14권1호
• /
• pp.91-107
• /
• 1998

Waste disposal problem is one of the most important social welfare indicators in urban area, because the volume of waste generated from urban area is remarkable. So far most waste of Seoul has been disposed at landfills. However, this landifill disposal method is confronted with several difficulties in recent. As public concern on environmental problem increases and autonomy system is settled down, local community people of the landfills refuse to receive the waste produced other places any more. It brought reginal confliction problem between waste sending and receiving by refusing to accept waste from certain region. Furthermore, it is difficult to find another place to fill up the waste, while the existing landfiis is reached at the limit in the near future. In terms of environmental aspects landfill method is not the best way to dispose waste. It contaminates the soil and ground/underground water by leaking water containing many serious pollutants as well as offensive oder. In terms of equity, this waste disposal method is not fair. Environmental pollution causes damage to residence near to the landfills, while the waste produced other places. In order to satisfy the equity aspect, the waste generated a region should be disposed within the region. Incineration of Waste has been provided as the alternative. Government plans to construct waste incinerator in every anatomy, so the waste produced by local community is disposed within their local autonomous area. However, the location decision is not easy, since waste incinerator is one of the facilities to the community people. We can not apply the existing location models for this problem, because they show strong NIMBY phenomenon for the location. The location of waste incinerator should be determined very carefully with consideration of various location factors and criteria. This study proposes a methodology for determining the location of the waste incinerators by utilizing GIS, which is a power research tool for location decision where various geographical factors related. We drive the location factors which should be considered in the determination of waste incinerators. They involve environmental, socio-economic, and institutional factors. In first, we eliminate the area which is located within the environmental location criteria such as slope, fault line, distance to river, and then eliminate ares which is conflict with the social and institutional criteria.

• 한국컴퓨터정보학회논문지
• /
• 제25권1호
• /
• pp.109-115
• /
• 2020

어깨는 인간의 몸통과 양팔을 연결하는 부위를 말하며, 양팔을 움직이는데 핵심적인 역할을 한다. 특히 양손을 머리의 뒤쪽으로 보내거나 우리 몸으로부터 멀리 보내는데 가장 중요한 역할을 수행한다. 본 논문에서는 어깨에서 팔의 안쪽 돌림과 가쪽 돌림에 대하여 각도를 측정하고, 이상 유무와 관련된 증상을 파악하며, 이러한 증상을 예방하는 방법까지 제시하도록 한다. 어깨에서 팔의 안쪽돌림과 가쪽 돌림의 각도는 70°~90°가 일반적이다. 그리고 각도가 이에 못 미치거나 통증을 느끼면 어깨에 이상이 생긴 것이다. 또한 일반인 남녀 각각 50명씩 총 100명을 대상으로 실험을 수행하여 이상이 있는 환자를 판별하였다.

• 디지털산업정보학회논문지
• /
• 제12권3호
• /
• pp.75-85
• /
• 2016

MANET is a network composed only mobile network having limited resources and has dynamic topology characteristics. Therefore, every mobile node acts as a route and delivers data by using multi-hop method. In particular, group communication such as multicast is desperately needed because of characteristics such as battery life of limited wireless bandwidth and mobile nodes. However, the multicast technique can have different efficient of data transmission according to configuring method of a virtual topology by the movement of the nodes and the performance of a multicast can be significantly degraded. In this paper, the region based security multicast technique is proposed in order to increase the efficiency of data transmission by maintaining an optimal path and enhance the security features in data transmission. The group management node that manages the state information of the member nodes after the whole network is separated to area for efficient management of multicast member nodes is used. Member node encrypts using member key for secure data transmission and the security features are strengthened by sending the data after encrypted using group key in group management node. The superiority of the proposed technique in this paper was confirmed through experiments.

• Journal of Chest Surgery
• /
• 제15권2호
• /
• pp.222-229
• /
• 1982

The aneurysmal dilatation of ascending aorta with the aortic regurgitation presents typical surgical problems. Over the years, various surgical procedures had been used for the management of the dilated segment of sending aorta and the aortic regurgitation. The surgical technique Is still in the state of evolution. The one method is the super coronary replacement of the ascending aorta with vascular graft and replacement of the aortic valve with preservation of the coronary ostia as advocated by Miller and his colleague at Stanford University, so called conventional technique". The other is the replacement of aortic valve and the dilated segment of the ascending aorta using a composite graft and transplantation of the coronary ostia as described by Bentall and DeBono in 1968. The controversy appears to evolve around 3 technical problems. One is bleeding from the grafted area. Two is later development of the aneurysmal dilatation of the subcoronary aortic wall when non-composite graft is employed. Three is a management of the coronary arteries. The purpose of this article is to present our experience with 7 cases of annuloaortic ectasia in whom both of these surgical techniques at that employed and to review some of the problems that encountered during the management of these patients .

• 한국멀티미디어학회논문지
• /
• 제13권6호
• /
• pp.901-910
• /
• 2010

$IP^2$, as an extended concept of the next generation IMT network, is a concept of basically supporting mobility using two steps of IP address (i.e. IPha (IP Host address) and IPra (IP routing address)) in IP backbone network. Current $IP^2$system has a shortcoming of excess usage of network resources caused by sending paging messages to all cells in LA (Location Area) in paging procedure. Considering the evolving direction of network, which is taking mobility with various speed and integration of devices into consideration, this shortcoming must be overcome. In this paper, we proposed a method to reduce time and memory for paging by maintaining current information of MN (Mobile Node) not in Active state with proxy server. Performance evaluation based on NS-2 simulations has shown that the efficiency of network resources is improved in the proposed method.