Extensive Sensor Data Preprocessing Framework for Error Detection and Correction, Reconstruction, and Redundancy Elimination
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Extensive Sensor Data Preprocessing Framework for Error Detection and Correction, Reconstruction, and Redundancy Elimination
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Extensive Sensor Data Preprocessing Framework for Error Detection and Correction, Reconstruction, and Redundancy Elimination
Description
The Wireless Sensor Network (WSN) is a network built with sensor nodes that are densely deployed in unattended environments. The data that is sensed by the sensor nodes hops to reach the requested destination. The recent advancement in technology had made a tremendous growth in the data that is produced through the WSN. This data together form the big data. The big data generated from the WSN is called big sensor data. This big sensor data is prone to many errors which may be induced either naturally or through intruders. There are many types of errors that may occur in the big sensor data but only four types of errors are considered for evaluation. The wireless trend emerged in 1980s as wireless voice networks. The concept of wireless data networks emerged in 1999. The WSN is also known as Ubiquitous Sensor Networks (USN). WSN is a group of spatially dispersed and dedicated sensor hubs for monitoring and recording the requested happenings and the recorded values are transferred to the nearest base station or the requested node for further processing. These sensor nodes are densely placed or dropped into unattended environment where human cannot intervene. The sensor nodes are deployed on land, underground and underwater.
Shipping & Processing
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Processing times
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- Supplier delays: Occasionally a supplier is delayed, or their stock information turns out to be inaccurate. We’ll keep your order open for up to 60 days. If an item hasn’t shipped or isn’t on its way to us by then, we’ll cancel that item and refund it.
How accurate is availability?
Availability is based on the stock levels our suppliers tell us they hold, and we update it regularly. If a supplier issue affects your order, we’ll let you know with an updated estimate.
Delivery
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- If your order has more than one item, we hold the in-stock items until everything is ready, so we can ship your whole order together in one parcel.
- Shipping cost: Free on orders over $100 within Australia, otherwise $9.95 flat rate per order however many items you buy. Free shipping applies to Australian addresses only; delivery to New Zealand is $14.95 per order.
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Cancellations
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- Items in transit: Once an item is on its way, either from our supplier to us or from us to you, it can’t be cancelled. If you no longer want it once it arrives, you can return it as a change of mind, with return postage at your cost. See Returns.
- Separate orders can’t be combined once they’ve been placed, and adding or swapping items can change the delivery estimate.
- Supplier delays: Occasionally a supplier is delayed, or their stock information turns out to be inaccurate. We’ll keep your order open for up to 60 days. If an item hasn’t shipped or isn’t on its way to us by then, we’ll cancel that item and refund it.
Faulty or damaged items are always covered. See Returns.
Returns
Damaged or incorrect items (within 30 days)
If an item arrives damaged or isn’t what you ordered, contact us within 30 days of delivery. We may ask for a photo, and if we need the item back we’ll send a prepaid return label, so it costs you nothing. You’ll receive a replacement or refund, as guaranteed under the Australian Consumer Law.
Change of mind (within 30 days)
We offer a refund or store credit for change of mind within 30 days of purchase when:
- you have your proof of purchase;
- the item is unused and in its original condition and packaging;
- it isn’t a sale item, special order, custom item or gift voucher.
You pay the postage to return change-of-mind items. Change-of-mind returns aren’t available for print-on-demand titles or bulk orders with special pricing.
Returned to sender
If an order is sent to an incorrect address you gave us, or isn’t collected and Australia Post returns it to us, you’ll need to pay the postage to send it again.