A method for generating a structured representation from an unstructured description includes receiving, by a computer, an unstructured description, and generating, by the computer, a structured representation based upon the unstructured description. A housing unit includes a cover having a first fastener part and a base having a second fastener part. The PASS-Tracker utilizes a plurality of small microphones to detect the acoustic signal from the PASS device. The DPF is placed such that a length direction thereof follows a width direction of a vehicle body. A method of optimizing speculative address load processing by a microprocessor includes identifying a speculative load, marking the speculative load, inserting the marked speculative load into a load miss queue, determining whether a miss occurs for the speculative load, and preventing the load miss queue from committing the marked speculative load to cache if a miss occurs.