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The concept of data aggregation rate (DAR) is introduced to denote the compressing capability of a sensor node in the sensor networks. The traditional assumption conditions about sensor capabilities include perfect data aggregation (PDA) and not using data aggregation (NDA). DAR breaks through the traditional assumption conditions and presents a new(More)
The efficient subdivision of a sensor network into uniform clusters of physically close nodes is an important building block in the design of efficient upper layer network functions such as routing, broadcast, data aggregation, and query processing. This paper analyzes a low energy adaptive clustering hierarchy (LEACH) in terms of the optimum number of(More)
In the wireless sensor networks, prolonging network lifetime is an important aim. Unbalanced energy consumption influences greatly the network lifetime. Therefore, it introduces hybrid transmission mechanism for cell-based wireless sensor network. The sensor node forwards data either by one-hop direct transmission or by multiple small hops. This mechanism(More)
This paper analyzes the current status of curriculum teaching process in the current operating system curriculum. Considering teaching content, teaching methods, and course construction and so on, this paper proposes some resolutions for teaching reform with the work experience. Furthermore, it is a key resolution to introduce multi-core technology and(More)
Limited bandwidth capacity and battery power are the unique characters of Underwater Sensor Networks (UWSNs). First this study introduces a competition scheme based on delay time. This scheme provides a selection method of relay nodes considering the limited bandwidth capacity. Then a heterogeneous nodes distribution strategy is proposed to balance the(More)
Lifetime prolonging is one significant research issue in underwater acoustic sensor networks (UASNs). First this paper analyzes the relationship between the receiving energy consumption and the transmission energy consumption in the acoustic communication of UASNs. The routing tree is built up on the factor of optimal transmission range. Then a hybrid data(More)
The severe energy constraints of sensors and the unique characteristics of underwater sensor networks (UWSNs) present major challenges for the long-term monitoring applications. This paper proposes two novel adaptive transmission algorithms for UWSNs to prolong lifetime. When a message becomes available for propagation at a node, the node will propagate(More)