• Title/Summary/Keyword: Radio Wave Radius

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A Multi-Level Routing Protocol Based on Fixed Radio Wave Radius in Wireless Sensor Network (무선센서네트워크에서 전파범위를 기반으로 한 다단계 라우팅 프로토콜)

  • Jin, Shi-Mei;Li, Yong-Zhen;Rhee, Chung-Sei
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.8B
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    • pp.630-635
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    • 2008
  • Recently, in order to improve the energy efficiency of WSN(Wireless Sensor Network), widely research have teen carried on. But, up to the present, Majority of methods are based on direct communication between CH(cluster head) and sink node, and based on the assumption that node can regulate signal energy actively according to the distance between nodes. So it's hard to implement those methods. Based on the theory that node has fixed radio wave radius, this paper present a multi leveling routing protocol. According to the simulation of the presented protocol, we have proved the energy saving efficiency and the implementation in real WSN.

A Multi-level Energy Efficient Routing Algorithm on Fixed Radio Wave Radius in Wireless Sensor Network (고정 전파 파장 반경에 의한 무선 센서네트워크에서의 다단계 에너지 효율적인 라우팅 알고리즘)

  • Rhee, Chung Sei
    • Convergence Security Journal
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    • v.13 no.6
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    • pp.69-76
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    • 2013
  • A lot of researches have been done to improve the energy efficiency of Wireless Sensor Networks. But all the current researches are based on the idea of direct communication between cluster head and sink node. Previous results assume that node can intelligently regulate signal energy according to the distance between nodes. It is difficult to implement algorithms based on this assumption. We present a multi-level routing algorithm from the sink node to all other nodes which have fixed radio wave radius. We also show the energy saving efficiency and the implementation in real WSN using the simulation result.

A Low-Power Clustering Algorithm Based on Fixed Radio Wave Radius in WSN (WSN에서 전파범위 기반의 저 전력 클러스터링 알고리즘)

  • Rhee, Chung Sei
    • Convergence Security Journal
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    • v.15 no.3_1
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    • pp.75-82
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    • 2015
  • Recently, lot of researches on multi-level protocol have been done to balance the sensor node energy consumption of WSN and to improve the node efficiency to extend the life of the entire network. Especially in multi-hop protocol, a variety of models have been studied to improve energy efficiency and apply it in real system. In multi-hop protocol, we assume that energy consumption can be adjusted based on the distance between the sensor nodes. However, according to the physical property of the actual WSN, it's hard to establish this. In this paper, we propose low-power sub-cluster protocol to improve the energy efficiency based on the spread of distance. Compared with the previous protocols, the proposed protocol is energy efficient and can be effectively used in the wireless sensing network.

The Intensity variation of the Electromagnetic wave by Ring type Obstacles (환형 장애물로 인한 전자파 세기 변화)

  • 류수현;이재우;홍의석
    • Proceedings of the Korean Institute of Communication Sciences Conference
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    • 1988.10a
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    • pp.114-117
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    • 1988
  • In mobile radio communication system involving geostationary satellites the field intensity of electromagnetic wave varies with frequency shape and location of an obstacle between a tramamitter and a receiver. In this paper a ring type obstacle between the propagation paths is presented. On the basis of Fresnel diffraction theory, the field intensity varying with ring-type obstacle’s radius is obtained by computer simulation.]

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A Study of Radio Wave Propagation Characteristics at 900MHz Range for Urban Modelling (도시형 모델링을 위한 900MHz대 전파전파 특성에 대한 연구(I))

  • 남채우;박성교박종백
    • Proceedings of the IEEK Conference
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    • 1998.06a
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    • pp.165-168
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    • 1998
  • This paper describes the characteristics of CT-2 radio wave propagation at 900MHz range. Typical cell coverage of CT-2 based on picocellular design provides a 200m radius. The five sites of urban regions of Kwang Ju city were chosen to characterize propagation in various environments. On the basis of cell coverage data measured with field strength meter, average 75% of telepoint service was retained and it was lack 25% of overall gain. In some sites telepoint service was limited to two of four directions around a station. If specially designed collinear antenna with specific directivities are used in these shadow area, improved results will be acquired.

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A Low-Power Clustering Algorithm Based on Fixed Radio Wave Radius in Wireless Sensor Networks (무선센서네트워크에서 전파범위기반의 저 전력 클러스터링 알고리즘)

  • Li, Yong-Zhen;Jin, Shi-Mei;Rhee, Chung-Sei
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.7B
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    • pp.1098-1104
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    • 2010
  • Recently, a variety of research of multi-hop routing protocol have been done to balance the sensor node energy consumption of WSN(wireless sensor network) and to improve the node efficiency for extending the life of the entire network. Especially in multi-hop protocol, a variety of models have been concerned to improve energy efficiency and apply in the reality. In multi-hop protocol, we assumption that energy consumption can be adjusted based on the distance between the sensor nodes. However, according to the physical property of the actual WSN, it's hard to establish this assumption. In this dissertation, we propose low-power sub-cluster protocol to improve the energy efficiency based on the spread of distance. Compared with the previous protocols, this proposed protocol can be effectively used in the wireless sensing networks.

[ N2H+ ] OBSERVATIONS OF MOLECULAR CLOUD CORES IN TAURUS

  • TATEMATSU KEN'ICHI
    • Journal of The Korean Astronomical Society
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    • v.38 no.2
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    • pp.279-282
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    • 2005
  • We report the millimeter-wave radio observations of molecular cloud cores in Taurus. The observed line is the $N_2H^+$ emission at 93 GHz, which is known to be less affected by molecular depletion. We have compared starless (IRAS-less) cores with star-forming cores. We found that there is no large difference between starless and star-forming cores, in core radius, linewidth, core mass, and radial intensity profile. Our result is in contrast with the result obtained by using a popular molecular line, in which starless cores are larger and less condensed. We suggest that different results mainly come from whether the employed molecular line is affected by depletion or not. We made a virial analysis, and found that both starless and star-forming cores are not far from the critical equilibrium state, in Taurus. Together with the fact that Taurus cores are almost thermally supported, we conclude that starless Taurus cores evolve to star formation without dissipating turbulence. The critical equilibrium state in the virial analysis corresponds to the critical Bonnor-Ebert sphere in the Bonnor-Ebert analysis (Nakano 1998). It is suggested that the initial condition of the molecular cloud cores/globules for star formation is close to the critical equilibrium state/critical Bonnor-Ebert sphere, in the low-mass star forming region.

An Energy Efficient Routing Algorithm based on Center of Local Clustering in Wireless Sensor Networks (무선센서 네트워크에서의 지역-중앙 클러스터 라우팅 방법)

  • He, Jin Ming;Rhee, Chung-Sei
    • Convergence Security Journal
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    • v.14 no.2
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    • pp.43-50
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    • 2014
  • Recently, lot of researches for the multi-level protocol have been done to balance the sensor node energy consumption of WSN and improve the node efficiency to extend the life of the entire network. Especially in multi-hop protocol, a variety of models have been proposed to improve energy efficiency and apply it to WSN protocol. In this paper, we analyze LEACH algorithm and propose new method based on center of local clustering routing algorithm in wireless sensor networks. We also perform NS-2 simulation to show the performance of our model.

A Thin Folded Dipole UHF RFID Tag Antenna with Shorting Pins for Metallic Objects

  • Tang, Tao;Du, Guo-Hong
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.6 no.9
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    • pp.2253-2265
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    • 2012
  • A novel folded dipole type microstrip patch antenna designed for ultrahigh frequency (UHF) band radio frequency identification (RFID) tag is presented in this paper, which can be used on the metallic objects. The presented antenna is fabricated on a very thin Rogers 5880 substrate with a thickness of 0.508 mm. The structure consists of two folded dipole and two symmetrical shorting pins placed at both sides of feed point. An adjustable frequency response can be easy obtained via modify the location and radius of the shorting pins. The antenna has been analyzed by full wave simulations soft. The simulated bandwidth is about 67.2 MHz, which covers the Europe and North America UHF RFID frequency range. A manufactured prototype has been fabricated and measured to demonstrate the antenna performances. The simulation results agree with the measurement data well. The measured maximum reading range of the prototype can be reached 4.1 m in free space, and 3.2 m on a metal plate whose size is $150{\times}150{\times}8mm^3$.

A Study on Efficient Access Point Installation Based on Fixed Radio Wave Radius for WSN Configuration at Subway Station (지하철 역사 내 WSN 환경구축을 위한 고정 전파범위 기반의 효율적인 AP설치에 관한 연구)

  • An, Taeki;Ahn, Chihyung;Lee, Youngseok;Nam, Myungwoo
    • 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.