A submucosal tumor of the esophagus was enucleated by a thoracotomy. A microscopic examination showed the tumor to be composed of spindle-shaped cells showing mild nuclear atypia with vague nuclear palisading and scarce mitotic figures. The tumor was surrounded by peripheral lymphoid cuffs. An immunohistochemical study demonstrated diffuse positive staining for S-100 protein in the tumor cells. The lesion was diagnosed to be an esophageal schwannoma based on these pathological features. Benign schwannoma of the esophagus has been described in five cases in four reports in the English literature. This is the sixth case diagnosed by immunohistochemical studies.

No abstract

We propose an on-line writer recognition method for Thai hased on velocity of harycenler of pewpoint movement. The harycenter is determined from the center point of script and two adjacent pen-point [wsitiuns with respect lo time in handwriting process. In this paper, the Fourier coefticients V I the velocity and trajectory of the barycenter are considered as the input antl output of PlR(finite impulse response) system. rcslicctively. In this case. the impulse response of the FIR system is interpreted as the feature of handwriting. The K-L expansion of the impulse response is used for writer recognition. Writer recognition experiments are performed on datahae cnnsistinp of 6.642 Thai scripts written by 81 writers. As the result. Type I(false rejection) and Type Il(fa1se acceptance) C R O~ rates were 1.50% and O.fjS%, respectively.

No abstract

No abstract