In recent years, European countries have been trying to cultivate electrical scooters (e-scooters) as an alternative form of micro-mobility. The purchase and maintenance costs private e-scooters are expensive so cities collaborating with companies construct e-scooter rental network. This paper aims interpret the usage patterns suggest optimal station locations for charging parking. dataset depi...

Wireless Sensor Networks (WSN) consists of battery-powered sensor nodes which collect data and route the data to the Base Station. Centralized Cluster-based routing protocols efficiently utilize limited energy of the nodes by selecting Cluster Heads (CHs) in each round. Selection of CHs and Cluster formation is performed by the Base Station. In each round, nodes transmit their location informat...

This paper deals with secure fast handoff among access points (APs) of different IEEE 802.11r mobility domains. We leverage standard IEEE 802.11i mechanisms to let a station preauthenticate and establish a pairwise transient key with some target AP beforehand. Upon reassociation, the new AP aware of the preauthenticated station can thus complete handoff sooner than would otherwise be required. ...

The aim of this paper is to study the impact of the base station site locations and antenna orientations on UMTS radio network performance under different traffic distributions, and to find an optimum deployment strategy from 3-sectored to 6-sectored site solutions. A radio network planning tool has been used to verify the radio network system performance of different network scenarios. The res...

The construction of hydrogen refueling stations is an important part the promotion fuel cell vehicles. In this paper, a multi-period station location model presented that can be applied to planning and infrastructures. Based on demand passenger cars commercial vehicles, calculates each zone by weighting method according population, economic level education level. Then, period calculated using g...

PURPOSE When performing a laparoscopic assisted gastrectomy, a function-preserving gastrectomy is performed depending on the location of the primary gastric cancer. This study examined the incidence of lymph node metastasis by the lymph node station number by tumor location to determine the optimal extent of the lymph node dissection. MATERIALS AND METHODS The subjects consisted of 1,510 pati...