A practical slotted quasi-synchronous CDMA access system for LEO micro-satellite short message transmission

Author(s):  
Zhang Zhao-yang ◽  
Lai Li-feng
2002 ◽  
Vol 14 (03) ◽  
pp. 109-114 ◽  
Author(s):  
REN-GUEY LEE ◽  
KUANG-CHIUNG CHANG

This paper presents an SMS based design in the GSM system for a portable, light weighted, and small sized TeleAlarm device. The device is composed of a transmitter and a controller. When an emergent situation such as a stroke or a fall occurs, the user only needs to push a button to trigger the controller. The controller automatically sends text messages stored in its database through the transmitter to specified mobile phone numbers for help. The SMS uses only the control channels in the GSM system to transfer the message, which enables the receiving-end user to receive it even during a call. An experimental test shows that a complete message transmission only needs 2.949 seconds in average. The design is convenient to elderly people who may live alone.


2014 ◽  
Vol 543-547 ◽  
pp. 4288-4290 ◽  
Author(s):  
Li Liu

In Opportunistic networks, mobile nodes communicate with each other through store-carry-and-forward manner by use of short message transmission technologies such as Bluetooth or WiFi. Message delivery relies mainly on cooperation among nodes. The incentive mechanism which aims to stimulate cooperation and prevent self-ish behavior is important. Reputation-based mechanism is one of the most popular motivations to tackle this problem. This paper surveys the recent reputation-based incentive mechanisms in Opportunistic Networks.


2020 ◽  
Vol 32 ◽  
pp. 03021
Author(s):  
Tanuja Sawant ◽  
Dhrupal Shah ◽  
Smita Sontakke ◽  
Prathmesh Gunjgur

Android phones being stolen is a significant problem that causes concerns to intellectual privacy and property. Always protecting smartphones from being stolen is a problem that remains. The key findings of the survey of existing systems for theft protection are, they provide various efficient functionalities but fail when the internet is unavailable or require specialized equipment to detect thefts. Most of these solutions are not free of charge, inefficient, time-consuming, or/and inflexible. This paper puts forward a system that provides an ML-based real-time anti-theft and remote access system for android devices. It detects theft using SVM-RBF model trained on feature-set extracted from the inertial sensor’s data with an accuracy of 0.76. Whereas remote access is provided using short message services (SMS). The salient feature of this system is minimal configuration without intruding human-assisted tasks. Moreover, it will be an excellent help for authentic smartphone users to realize the theft situation and utilize the remote access features.


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