22 research outputs found
Preparation of polymeric temperature sensors using fluorescence quenching by fullerene
Thesis(masters) --μμΈλνκ΅ λνμ :μ¬λ£κ³΅νλΆ,2008.8.Maste
Cooperation between ZIGBEE and WIFI for Detecting 802.11 Access Points in Smart-phones
νμλ
Όλ¬Έ (μμ¬)-- μμΈλνκ΅ λνμ : μ κΈ°Β·μ»΄ν¨ν°κ³΅νλΆ, 2012. 2. κΉμ’
κΆ.μ΅κ·Όμ μ€λ§νΈ ν° κΈ°μ μ μμ
μ , κ΅°μ¬μ , νμ μ μΌλ‘ μ΄μ©κ°μΉκ° λκΈ° λλ¬Έμ λ€μν λΆμΌμμ μμ©λμ΄ κ·Έ 보κΈμ΄ νλλκ³ μλ€.
μ€λ§νΈν°μ΄λΌλ νλ«νΌμ κ·Έ νμ₯λ₯λ ₯μ ν΅ν΄ μμ© μ΄λν΅μ μμ μ£Όλ ₯ λ€νΈμν¬ λ¨λ§κΈ°λ‘ μ리μ‘κ² λμμ λΏλ§μλλΌ, κ΅°μ¬μ λͺ©μ μΌλ‘λ μμ©λμ΄ κ΅°μ© μ μ λ€νΈμν¬μ κ°μΈ μ μ λ¨λ§κΈ°λ‘μμ μν κΉμ§ μννκ³ μλ€.
κ·Έλ¬λ μ΄λ¬ν μ€λ§νΈν°μ νμ°μ μμ°μ μΌλ‘ μ£Όνμ λ° λμν λΆμ‘±μΌλ‘ μΈν ν΅μ μ₯μ νμμ μΌμΌν€κ² λμ΄, μ¬μ©μλ‘ νμ¬κΈ λ°μ΄ν°μ μ‘μμ μ¨μ λ¨μ΄μ§κ² νλ€.
μ΄λ₯Ό ν΄κ²°νκΈ° μν΄ 802.11 μ₯λΉλ₯Ό ν΅νμ¬ νΈλν½μ λΆμ°μν€λκ²μ΄ νλμ λμμΌλ‘μ νμ¬ λ리 μ°μ¬μ§κ³ μμΌλ, λͺ¨λ°μΌ μ₯λΉμ λ°°ν°λ¦¬ μ μ½μ κ³ λ €ν μ, μ΄μ€λ§ ꡬμ±μ λ°λ₯Έ μλμ§ μλͺ¨κ° λλ€λ₯Έ λ¬Έμ λ‘ λΆμνκ³ μλ€.
μ€λ§νΈν°μ WIFI μ¬μ©μ access point (AP) λ₯Ό μ°ΎκΈ° μν΄ μ§μμ μΌλ‘ 802.11 channelμ νμνλ€. νΉν μ€λ§νΈν°μ λ€μ΄λλ―Ήν λͺ¨λΉλ¦¬ν° νΉμ±μ μ΄λ¬ν μλμ§ μλͺ¨λ₯Ό μ¦κ°μν¨λ€. APμ μ νΈ λλ¬κ±°λ¦¬κ° μκ³ , μ μμμ 컀λ²ν λ§νΌ APκ° λ°°μΉλμ΄ μμ§ μμ νκ²½μ μΈ λ¬Έμ λν ν¬λ€.
μ΄λ° μμΈλ€μ κ²°κ΅ μ€λ§νΈ ν°μ μλμ§ μ¬μ© ν¨μ¨μ λ¨μ΄λ¨λ € μ¬μ©μκ°μ κ°μμν¨λ€.
μ΄ λ¬Έμ λ₯Ό μ μ λ ₯ μ₯λΉλ₯Ό μ΄μ©ν νμ λ°©μμΌλ‘ 극볡νκ³ μνλ μ°κ΅¬κ° λ€μν λ°©μμΌλ‘ μ§νλμλ€. νΉν, ZIGBEEλ₯Ό μ΄μ©ν νμλ°©μμ μ체 μκ³ λ¦¬μ¦μ ν΅ν΄ false alramμ κ°μμν€λ λ°©μμΌλ‘ λ°μ λμλ€. κ·Έλ¬λ, λ³Έ λ
Όλ¬Έμμλ μ΄λ¬ν λ°©μμ νκ³κ° μμΌλ©°, κ°λ³ νλμ¨μ΄μ 쑰건 λ° μνμ λ°λΌ λ€λ₯΄λ€λ κ²μ μνμ λΆμμ ν΅ν΄ μ¦λͺ
νμλ€. λν, μ μ¦λͺ
μ ν΅νμ¬ κ°λ³ μ₯λΉκ° νΉμ±μ μ΄μ©ν νμ μκ³ λ¦¬μ¦μ μ μνμλ€. μ°λ¦¬μ λ°©μμ μ¬μ©μκ° APκ° μλ ꡬμμ μλ€κ³ νλ¨λ μ μλμ§ μλͺ¨κ° λ§μ 802.11 λλ°μ΄μ€λ₯Ό μ μ§μν€κ³ μλμ μΌλ‘ μλμ§ μλͺ¨κ° μ μ ZIGBEEλ‘ νμ¬ μ±λμ μ νΈλ₯Ό μ΅μνμΌλ‘ μνλ§ νμ¬, κ²°κ³Όλ₯Ό μ€λ§νΈ ν°μ μ λ¬νλ€. μ€λ§νΈν°μ μ΄ λ°μ΄ν°λ₯Ό λ°νμΌλ‘ λ¨μν νν°λ§ μκ³ λ¦¬μ¦μ ν΅ν΄ APμ beacon signalμ νμ§νλ€. λ§μ½ APκ° μ‘΄μ¬νλ€κ³ νλ¨λ μ, WIFI NICλ₯Ό μλνμ¬ μ±λμ μ€μΊ νλ€. μ΄λ κ°κ°μ μ₯λΉλ€μ κ°λ³μ μΌλ‘ μ¬μ©νμ¬ APλ₯Ό νμ μ λ°μλ μ μλ μλμ§ μλͺ¨λ³΄λ€ λ μ μ μλμ§λ₯Ό μλͺ¨νλλ‘ κ³ μνμλ€. μ΄ λ
Όλ¬Έμ contributionμ λ€μκ³Ό κ°λ€.
1) WIFI λλ ZIGBEE λ₯Ό λ¨λ
μΌλ‘ μ¬μ©νμ¬ 802.11 APλ₯Ό νμμ λ°μλλ μλμ§ μλͺ¨ λ° false alarm μ λν΄ λΆμνμλ€.
2) false negativeλ₯Ό μ΅μν νκΈ° μν΄, APμ beacon signalμ κΈΈμ΄λ₯Ό κΈ°λ°μΌλ‘ ν counter filterλ₯Ό μ€κ³νμλ€.
3) μλμ§ ν¨μ¨μ λμ΄κΈ° μν΄ ZIGBEEμ WIFIμ νμ μμμ μκ°μ κ²°μ νλ νμ μ₯λΉ μ€μΌμ€λ§ κΈ°λ²μ κ³ μνμλ€.
4) μ΄λ¬ν μμ€ν
μ νμ©ν μμ
μ , κ΅°μ¬μ μ΄μ©λ°©μμ μ μνμλ€.Presently, smartphone users widely use WiFi hotspots to obtain a better data transmission rate. In addition, mobile network operators (cellular network providers) deploy these to reduce the traffic load of the cellular network. However, the deployment density of WiFi hotspots is smaller than that of cellular networks. Therefore, smartphone users normally use the cellular network to access the internet, and change to WiFi when they detect an 802.11 access point (AP). In this situation, a lot of energy is consumed in finding a new AP. One of the solutions to this problem is the use of low-power devices like ZIGBEE. Previously researched detection methods that use ZIGBEE are complicated because they focus on reducing the number of false positives. Therefore, their energy efficiency is very low. In this paper, we use the cooperation between ZIGBEE and the WiFi network interface card (NIC) to solve this problem. We minimize false negatives and energy consumption from the detection process, and solve the problem of false positives using the CPU and WiFi NIC in the smartphoneMaste
λΈλΌμ΄μΈ 배리(Brian M. Barry)μ μ μλ‘ κ³ μ°° : `μνΈ μ΄λμΌλ‘μμ μ μ(Justice as Mutual Advantage)`μ `λΆνΈλΆλΉμ±μΌλ‘μμ μ μ(Justice as Impartiality)`λΆμνμ μ€μ¬μΌλ‘
νμλ
Όλ¬Έ(μμ¬)--μμΈλνκ΅ λνμ :μ μΉνκ³Ό,2006.Maste
ι ζΉε ηΉζ§ ζΉεμ μν SOI ζ°΄εΉ³ε½’ ι»ε νΈλμ§μ€ν°
Thesis (doctoral)--μμΈλνκ΅ λνμ :μ 기곡νλΆ,1999.Docto