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NGOs contribute various amounts to the retirement plans. The table below summarizes the responses: % Employer Contribution 3 4 5 6 10 10 + # NGOs 1 2 2 0 2

Code Assist follows the Builder pattern to report results as well (see Figure 3318) Code Assist performs code completions at a given textual position inside a compilation unit

centered at the reference points having radii equal to the distances from these reference points. Angulation: Alternatively, the angles from two known reference points may be used to determine the location of an unknown point, as shown in Figure 12.1b. This mechanism is known as angulation. Here, the unknown location is obtained by the point of intersection of the lines drawn from the reference point with appropriate angles. The key issue for implementing a system that employs triangulation is to measure either the distances or angles from a set of xed stations acting as reference points. We next describe the methods that can be applied for measuring these. 12.2.1 Mechanisms for Estimating Distances Some of the known methods for estimating the distance between two points are as follows: r Received Signal Strength Indicator (RSSI). This utilizes the predicted propagation characteristics of a wireless signal to determine the distance from a transmitter. If the power of the transmitted signal is known, a receiver can estimate the distance from the transmitter by measuring the power of the signal that it receives from the transmitter. Although simple and cost effective, this technique suffers from signi cant errors as the path loss characteristics of wireless signals is highly dependent on the physical environment. For instance, the path loss

characteristics in free space is modeled as 1/d 2 , whereas in terrestrial conditions it is determined as 1/d , where 25 < < 45 depending on the terrain and other environmental factors [7] The path loss factor may be obtained experimentally for the speci c environment where it is to be used This is often a cost-effective method for distance estimation r Time of Flight: A useful technique for determining the distance between an RF transmitter and a receiver is to measure the time taken for the RF signal to cover the distance Here, a receiver measures the time of arrival (ToA) of a signal transmitted from reference point to compute the distance using the velocity of propagation of the signal This requires the receiver to have accurate time synchronization with the transmitter, which is often hard to implement.

Code Assist reports its findings to the Builder ICompletionRequestor The results are reported specifically to the type of the completion element

An alternative is use an additional transmitter to act as a frame of reference, where the receiver estimates the time differences of arrivals (TDoA) between signals from multiple transmitters to determine distances These distances can be used for localization using multilateration Such a technique is fairly accurate when the distances involved are long, such as between a ground-based receiver and a system of satellites orbiting the earth, as used in GPS However, distance ranging from time of ight is hard to implement for short distances because RF signals propagate in the speed of light and it requires extremely accurate hardware to detect small time differences 1222 Mechanisms for Estimating Angles Most of the earlier methods for angle estimation were based on optical methods, such as determining the direction of stars for air and sea navigation.

Actual employee salary deferral rates varied from 2 percent up to 10 percent, with an average of approximately 6 percent.

[ Team LiB ]

Some of the more technologically advanced methods for angle estimation are as follows: r Use of Directional Antennas Large phased-array antennas have gain patterns that can be suf ciently directional to allow determination of the angle of arrival of an RF signal This technique was proposed and evaluated in reference 8 for designing a system for tracking the locations of transportation vehicles It used rotating directional antennas in each vehicle to determine the angles of arrival of RF signals from xed base stations for localization However, even the most expensive phased array antennas can produce errors in angle estimation, which is the primary drawback of the system It also involves complex and bulky instrumentation (rotating directional antenna arrays) at the receiver r Use of Angular Signatures Another example of localization using angulation is the VHS omnidirectional ranging or VOR systems that are used for aircraft navigation.

Here, speci c RF signals are transmitted from ground-based VOR stations that allow receivers on ying aircrafts to determine the angles from the stations [9] A simple implementation of this idea involves a combination of periodic transmissions of bursts of an omnidirectional signal along with a continuously rotating beam emitted from the VOR station A receiving aircraft can determine the angular orientation with respect to the VOR station from the.

[ Team LiB ]