We propose the Concept Keyword Term Frequency/Inverse Document Frequency (ckTF/IDF) method as a novel technique to efficiency mine concept keywords from identifiers in large software projects. ckTF/IDF is suitable for mining concept keywords, since the ckTF/IDF is more lightweight than the TF/IDF method, and the ckTF/IDF's heuristics is tuned for identifiers in programs.We then experimentally apply the ckTF/IDF to our educational operating system udos, consisting of around 5,000 lines in C code, which produced promising results; the udos's source code was processed in 1.4 seconds with an accuracy of around 57%. This preliminary result suggests that our approach is useful for mining concept keywords from identifiers, although we need more research and experience.
We propose the Concept Keyword Term Frequency/Inverse Document Frequency (ckTF/IDF) method as a novel technique to efficiency mine concept keywords from identifiers in large software projects. ckTF/IDF is suitable for mining concept keywords, since the ckTF/IDF is more lightweight than the TF/IDF method, and the ckTF/IDF's heuristics is tuned for identifiers in programs.We then experimentally apply the ckTF/IDF to our educational operating system udos, consisting of around 5,000 lines in C code, which produced promising results; the udos's source code was processed in 1.4 seconds with an accuracy of around 57%. This preliminary result suggests that our approach is useful for mining concept keywords from identifiers, although we need more research and experience.
The aza-Wittig reaction of 2-methylthio-N-triphenylphosphomnylidcneaniline (2) with acid chlorides (3) in refluxing benzene or toluene afforded 2substituted 1,3-benzothiazoles (6)In recent years aza-Wittig reactions have emerged as a powerful method for the synthesis of heterocyclic compounds. 1 However, most of compounds prepared by this method are nitrogen heterocycles. In connection with our interest in development of sulfur-containing building blocks for heter0c~cles.2 we searched the l~terature about sulfur-containing iminophosphoranes and found that they are a rather unknown class of compounds; annulation of 1,3,4-thladiazole ring Into a 1,2,4-tnazlne ring was achieved by the intramolecular reactlon between a thloam~de group and carbodiimide funct~ons wh~ch were derived from imin0~hos~horanes.3 N-(Alkylth~omethyl)iminophosphoranes were prepared and applied to the synthesis of functionallzed N, Sacetals.4 Thus, we focused our attention to the compounds which would serve as building blocks for both sulfur and nitrogen-containing heterocycles.A simple iminophophorane, 2-methylthio-Ntriphenylphosphoranylideneaniline (2) bearing an active methylthio group seemed to be suitable for this purpose.We would like to report a new aza-Wittig reaction of 2 with acid chlorides (3) to 2-substituted 1,3-benzoth~azoles (6).5We planned to synthesize 1,4-benwthlazines (7) by cychzat~onof imidoyl chlorides (4) on treatment with bases,
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