Location Technologies

 Existing Location System
  A location system is composed of a transceiver and the related network. Those currently available on the market either feature transmitters or are applied in the far-reading frequency range only. The former types of products provide the service of warning through remote control detection to protect missing children and prevent loss of articles, however, with low accuracy and inefficient expandability. The latter is a location system using the GPS or CDMA, which comes with a wide tracking range, however, at a high price. Since RF signal reflection causes a huge error indoors or in urban areas, this system is used for general purposes, such as car navigation systems, rather than for industrial purposes. Despite its similarity to CDMA, which uses a mobile communication base station, it features its own unique network with a terrestrial location system providing location services, which has been commercialized in certain areas such as Austrilia and the U.K. only. It is expected to take a great deal of time for Korea to apply this system nationwide.

 Foreign Indoor Location Solutions
  Unfortunately, there is no indoor location system available in Korea, but international companies, such as AT&T, Active Wave, and Axcess, have realize indoor location systems. AT&T¡¯s Active Badge System transmits infrared-ray (IR) signals of active badges through a sensor network to track locations. IR signals come with interference, which prevents light from penetrating even a small object. Active Wave¡¯s ID Badge and Access Control System and Axcess¡¯s Wireless Automatic ID System are Zone-Based Systems (ZBS) which check the IDs saved in tags to identify locations once RF signals come within the transmission range of the reader with fixed RF signals. Although it is easy to apply them in small indoor areas, it requires a number of readers and gateways, and it is still difficult to apply them in large factories or amusement parks.

 SLS Location Technology
  The Smart Location System is an indoor/outdoor location system used in a ubiquituous environment, mounted with a programmable artificial-intelligence wireless RF Receiver-Transmitter. Two-way communication with the wireless Receiver-Transmitter, which can perform detection and communication at the same time, reduces network load. Using the internal program in the wireless Receiver-Transmitter allows independent decisions and performance, which, in turn, can help make security system programs simpler. As well, it can easily operate with other networks and systems. We have developed and applied our own mesh network to reduce network traffic and create a ubiquitous distributed environment, and applied a patent as well. This system composed of Smart Tag, S-Locator, S-Pointer, S-Gateway, and S-Sensor, has been designed so that Smart Tag can operate within different dual frequency bands between S-Locator and S-Pointer. This dual frequency band technology minimizes interference during transmission, improves location sensitivity, increases the data transfer distance, and ultimately reduces the number of S-Locators installed per unit area, thus covering up the weaknesses of the existing ZBS. We adopted the MZBT (Multi Zone-Based Triangulation) technique, which allows the S-Locator to perform outdoor location using an RSSI (Received Signal Strength Indicator), instead of using GPS and CDMA, which drastically improved the positioning accuracy and the system expandability outdoors.


Strengths of SLS

Smart Location System

 Real-time location management
 access control, theft prevention, and reducing costs for facility and inventory management.
 Link management between personnel & equipment
 Only the authorized person can access and carry out the designated research facilities or laptops

Network Security Reinforcement

 Before: Only the authorized person can use the PC and access the network
 Ubiquitous: Performs PC authentication through the user¡¯s location; network access authentication through the location of the user¡¯s PC

System Expandability and Stability

 With the distributed digital network, excellent stability; easy to add various devices, such as sensors

Low-Cost System Maintenance

 Existing wired/wireless networks can be used; real-time management and distributed control reduce maintenance costs


Ubiquitous Security System

 Smart Location System, a Ubiquitous Security System Using Location Information

 What is Ubiquitous?
   An environment in which all objects are given intelligence and are connected through networks, which enables computing any time anywhere

  Key Elements of Ubiquitous Computing
  - Intelligent Chip : Smaller, lower power consumption
  - Distributed Network : Wireless and independent network
  - Context Awareness : Compare locations, sensing, and conditions

  What is Smart Location System?
  - Introducing a ubiquitous environment into the existing access control system begins with location technology
  - Existing System¢¡ Who came and went when? (Who and When)
  - Ubiquitous System ¢¡ Who is now where, and in what state? (Where and What)


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