For the past few decades,the internet of underwater things(IoUT)otained a lot of attention in mobile aquatic applications such as oceanography,diver network monitoring,unmanned underwater exploration,underwater survei...For the past few decades,the internet of underwater things(IoUT)otained a lot of attention in mobile aquatic applications such as oceanography,diver network monitoring,unmanned underwater exploration,underwater surveillance,location tracking system,etc.Most of the IoUT applications rely on acoustic medium.The current IoUT applications face difficulty in delivering a reliable communication system due to the various technical limitations of IoUT environment such as low data rate,attenuation,limited bandwidth,limited battery,limited memory,connectivity problem,etc.One of the significant applications of IoUT include monitoring underwater diver networks.In order to perform a reliable and energy-efficient communication system in the underwater diver networks,a smart underwater hybrid softwaredefined modem(UHSDM)for the mobile ad-hoc network was developed that is used for selecting the best channel/medium among acoustic,visible light communication(VLC),and infrared(IR)based on the criteria established within the system.However,due to the mobility of underwater divers,the developed UHSDMmeets the challenges such as connectivity errors,frequent link failure,transmission delay caused by re-routing,etc.During emergency,the divers are most at the risk of survival.To deal with diver mobility,connectivity,energy efficiency,and reducing the latency in ADN,a handover mechanism based on pre-built UHSDM is proposed in this paper.This paper focuses on(1)design of UHSDM for ADN(2)propose the channel selection mechanism in UHSDM for selecting the best medium for handover and(3)propose handover protocol inADN.The implementation result shows that the proposed mechanism can be used to find the new route for divers in advance and the latency can be reduced significantly.Additionally,this paper shows the real field experiment of air tests and underwater tests with various distances.This research will contribute much to the profit of researchers in underwater diver networks and underwater networks,for improving the quality of services(QoS)of underwater applications.展开更多
Aims&Scope Asian Pacific Journal of Tropical\1edicine(APJTM).aimsto set up and provide an academic communicating platformfor internal ional physicians,medical scientisls,allied heallliscientists and public*health ...Aims&Scope Asian Pacific Journal of Tropical\1edicine(APJTM).aimsto set up and provide an academic communicating platformfor internal ional physicians,medical scientisls,allied heallliscientists and public*health vvorkem.esj jeciaLly those oftlie Asia-Pacific region and worldwide on tropical medicine,infectiousdiseases and public health,and to rneel the giwving challengesof undei’slanding,pieventing ami controlling the drarnatic globaletnergence and reeiMergence of infectious diseases in the Asia-Pacific region.展开更多
笔者经不住Internet网和调制解调器强大功能的诱惑，无奈外置Modem价格太高，于是就买了一块内置式传真卡，牌号为TOPSATR，带有Fax／Modem／Voice功能，最高传输速率为每秒14．4kb，此为上Internet网的最低速度，随卡附有英文说明书一...笔者经不住Internet网和调制解调器强大功能的诱惑，无奈外置Modem价格太高，于是就买了一块内置式传真卡，牌号为TOPSATR，带有Fax／Modem／Voice功能，最高传输速率为每秒14．4kb，此为上Internet网的最低速度，随卡附有英文说明书一本，以及Fax for Windows安装盘两张。展开更多
基金This research was a part of the project titled“Development of the wide-area underwater mobile communication systems”funded by the Ministry of Oceans and Fisheries,Korea.
文摘For the past few decades,the internet of underwater things(IoUT)otained a lot of attention in mobile aquatic applications such as oceanography,diver network monitoring,unmanned underwater exploration,underwater surveillance,location tracking system,etc.Most of the IoUT applications rely on acoustic medium.The current IoUT applications face difficulty in delivering a reliable communication system due to the various technical limitations of IoUT environment such as low data rate,attenuation,limited bandwidth,limited battery,limited memory,connectivity problem,etc.One of the significant applications of IoUT include monitoring underwater diver networks.In order to perform a reliable and energy-efficient communication system in the underwater diver networks,a smart underwater hybrid softwaredefined modem(UHSDM)for the mobile ad-hoc network was developed that is used for selecting the best channel/medium among acoustic,visible light communication(VLC),and infrared(IR)based on the criteria established within the system.However,due to the mobility of underwater divers,the developed UHSDMmeets the challenges such as connectivity errors,frequent link failure,transmission delay caused by re-routing,etc.During emergency,the divers are most at the risk of survival.To deal with diver mobility,connectivity,energy efficiency,and reducing the latency in ADN,a handover mechanism based on pre-built UHSDM is proposed in this paper.This paper focuses on(1)design of UHSDM for ADN(2)propose the channel selection mechanism in UHSDM for selecting the best medium for handover and(3)propose handover protocol inADN.The implementation result shows that the proposed mechanism can be used to find the new route for divers in advance and the latency can be reduced significantly.Additionally,this paper shows the real field experiment of air tests and underwater tests with various distances.This research will contribute much to the profit of researchers in underwater diver networks and underwater networks,for improving the quality of services(QoS)of underwater applications.
文摘Aims&Scope Asian Pacific Journal of Tropical\1edicine(APJTM).aimsto set up and provide an academic communicating platformfor internal ional physicians,medical scientisls,allied heallliscientists and public*health vvorkem.esj jeciaLly those oftlie Asia-Pacific region and worldwide on tropical medicine,infectiousdiseases and public health,and to rneel the giwving challengesof undei’slanding,pieventing ami controlling the drarnatic globaletnergence and reeiMergence of infectious diseases in the Asia-Pacific region.
文摘笔者经不住Internet网和调制解调器强大功能的诱惑，无奈外置Modem价格太高，于是就买了一块内置式传真卡，牌号为TOPSATR，带有Fax／Modem／Voice功能，最高传输速率为每秒14．4kb，此为上Internet网的最低速度，随卡附有英文说明书一本，以及Fax for Windows安装盘两张。
