Prior's three-valued modal logic Q was developed as a philosophically interesting modal logic. Thus, we should be able to modify Q as a temporal logic. Although a temporal version of Q was suggested by Prior, the subject has not been fully explored in the literature. In this paper, we develop a three-valued temporal logic Qt and give its axiomatization and semantics. We also argue that Qt provides a smooth solution to the problem of future contingents.

Verification is critical to the design of large and complex systems. SPIN is a well-known and extensively used verification tool. In this paper, we consider two tool chains, one existing, WSAT, and one introduced here, that support using SPIN to model check systems specified as Simulink Stateflow models. We present algorithms for doing the necessary translations and present empirical results that show the chain using tools introduced in this paper performs better than the one using the existing WSAT tool. We also show that these tools allow SPIN to be used for model checking nondeterministic Stateflow models in addition to deterministic ones.

SUMMARYFor the Okinawan economy to grow independently, it is essential to create new businesses; this will require the cultivation of technologies that will form the basis for those businesses, as well as the training of technicians and researchers. To promote the creation of new businesses and innovation that are "Unique to Okinawa," the Institute of Electrical Engineers of Japan set up a cooperative research committee to develop Okinawa-style robot-embedded systems. We proposed the concept of Okinawa-style robotembedded systems. To realize this concept, we organized technical meetings to promote research. Now our research focuses on developing playback-type navigation robots for use in land and air, and also on developing an underwater robot for conserving marine life in the waters around Okinawa. It is necessary to conduct proper measurements, observations, and sampling in water. To successfully perform these tasks, we needed to develop an underwater robot. We have made efforts in developing hardware, software, and applications for embedded techniques. We suggest that coarsely integrated operand scanning (CIOS) and bilateral filters (BFs) be implemented in hardware. We also developed devices to improve quality of life and to support disabled children through software. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 192(4): 44-50, 2015; Published online in Wiley Online Library (wileyonlinelibrary.com).

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The NW (Needleman-Wunsch) algorithm is a method of sequence alignment in bioinformatics. The NW algorithm can be applied for global sequence alignment, which is a way of arranging the sequences of DNA to identify regions of similarity. However, the NW algorithm requires a huge number of calculations compared with the SW (Smith-Waterman) algorithm. Many studies have focused on analyzing the output of multiple sequences quickly in three dimensions. However, such methods cannot obtain similarities for whole sequences. In this article, we extend the NW algorithm to three dimensions. The proposed method is expected to provide a fast analysis of high precision data sequences.