In this paper, we propose an infrastructure-free precise positioning system by utilizing a variation of received radio broadcast signal strength against vehicle travel as fingerprints of road segments. Use of broadcast wave is considered advantageous in deployment cost and sample density that affects measurement reliability, compared to communication medium such as 802.11p-based V2X radio used in our previous paper. We also present preliminary experimental results that indicate potential of positioning at 20cm accuracy by using reception information of two FM radio channels broadcast from a station about 20km away from the test track

We Propose an integrated design and test assistance method for pipelined processors. Our approach generates behavioral-level test environments for pipeline control mechanisms from a machine-readable specification. It includes automatic generation of test programs and behavioral descriptions. Verification can be done by applying logic simulation to both the designers' descriptions and the behavioral descriptions, and then comparing the results. We have implemented an experimental system that enumerates all hazard patterns--instruction patterns that cause pipeline hazards--from the specifications, and generates the test programs and the behavioral descriptions for the pipeline controllers. The test programs cover all of the hazard patterns. The behavioral descriptions can manipulate any instruction stream. Experimental results for several RISC processors show that actual hazard patterns are too numerous to be easily enumerated by hand. Using workstations, our system can generate the test programs that cover all of the patterns, taking a few minutes. Results suggest that the system can be used to evaluate pipeline design.

We present a symbolic language emptiness check algorithm based on forward state traversal. A verification property is given by a set of error traces written in ω-regular expression and is manipulated explicitly as a non-deterministic state transition graph. State space of the design model is implicitly traversed along the explicit graph. This method has a large amount of flexibility for controlling state traversal on the property space. It should become a good framework of incremental or approximate verification of ω-regular properties.