Abstract For lossless data compression, an off-line encoding method which has analysis and cutting of input symbol string is proposed. The analysis is based on replacement of frequent symbol pairs appearing repeatedly. By the operation, the encoder does not cut in the symbol string which emerges more frequently in the input symbol string. The encode does not send dictionary data to the encoder directly, but send information for construction of dictionary to the encoder. Its decoding can be done fast with one-path method without deep analysis of its input. A set of efficient data structures for the encoding and the decoding such as hash table, frequency table, and bidirectional list is used. Theoritical proof that the encoding and the decoding can be executed in time O(N) is proved, where N is the size of input data and O(・) is Bachmann-Landau Big O notation. Keywords [Data compression, Most frequent symbol pair, Replacement, Concatenation, Digram ]

View full abstract

Abstract Cu(In,Ga)Se2 (CIGS) crystals were synthesized by a mechanochemical (MC) process using a crank ball mill. The molar ratios of starting materials were Cu:In:Ga:Se=1:1-x:x:2 (0≤x≤1) and Cu:In:Ga:Se=1:0.7:0.3:y (2≤y≤3). The reaction time reduced with decreasing Se and Ga molar ratios. The collection rate decreased with longer reaction times. From XRD patterns, we confirmed that the CuInSe2 and/or CuGaSe2 crystals were successfully grown when the powders reacted. Although the crystals grown with a selenium molar ration of 2 were Se-poor, those grown at a molar ratio of 3 were Se-rich. When Se increasing molar ratio, Cu, In, and Ga were away from the stoichiometric. With a molar ratio of Cu:In:Ga:Se=1:0.7:0.3:2.5~2.7, their composition became stoichiometric. Crystal morphology was varied. CIGS crystals were thus successfully synthesized using a crank ball mill. Keywords [CIGS, Mechanochemical, Crank ball mill]

View full abstract

Abstract In this work, Ag-Sn-S thin films were deposited on glass substrates by vacuum deposition method at Ag, Sn or SnS powder. The results of crystalline structure major peaks were confirmed in the obtained crystal structure of Ag8SnS6 crystal and Ag2SnS3 crystal. In addition, possible to confirm the light absorption coefficient of about 104 cm-1 over for all the films. morphological observation, the surface of the round granular shape changed to an elongated shape as the sulfurization temperature increased, and the film became coarse after 500 °C. It was also found that voids can be reduced by using SnS for the sample. It was found that the transmittance gradually decreased as the wavelength became shorter, and the transmittance sharply decreased near the wavelength of 1000 nm. It was found that the band gap is about 1.1 to 1.34 eV close to the ideal band gap of 1.4 eV of the solar cell. Keywords [ Ag-Sn-S thin film , Sulfurization method ]

View full abstract

Abstract The novel type borate adsorbents, which consist of weak cation-exchange resins and nucleosides (adenosine or cytidine) linked to each other by the amide bond, were prepared and their borate adsorability was evaluated. Two different types of resins, one porous and the other highly porous, were examined to take into account the effect of physical structure differences on nucleoside linking. Regardless of the resin structure, about 30% carboxy groups of each resin were bonding with cytidine at the optimum conditions, however, the high porous type adsorbent had 10 times higher distribution ratio of borate than porous type one. This result indicated that the borate diffusion in the resin phase was influenced by the physical structure of resins because of the electrostatic interaction between carboxy groups and borate. Keywords [Borate adsorbent, Nucleoside, Amide bond, Chemical adsorption, Electrostatic interaction]

View full abstract

Abstract The novel microcapsules, which contained methyl-β-D-ribofuranoside (MRF), were prepared and employed as a boric acid adsorbent. To protect the hydroxyl groups of MRF in the radical polymerization reaction, the borate-MRF solution was prepared in the optimum condition, where almost MRF formed the 1:2 complex, and then, the solution was lyophilized to be a salt of the 1:2 complex. The obtained salt was used as an inner solid phase of microcapsules, and frame materials (trimethylolpropane trimethacrylate: Trim and divinylbenzene: DVB) and a pH of an outer aqueous phase were considered. From the environmental point of view, the other type microcapsule were also prepared by means of the solvent evaporation method using poly(ε-caprolactam), which is well known as a biodegradable polymer. In borate adsorption experiments, the only one microcapsule, which consisted of DVB at pH 11 of the outer phase, could sorb a little amount of borate. Keywords [Borate adsorption, Microcapsule, Ribofuranoside, Frame material, Biodegradable polymer]

View full abstract

Abstract At National Institute of Technology, Miyakonojo College (Miyakonojo Kosen), students take English Communication I, English Communication II, and English Conversation class during the first two years. In each class, students use textbooks approved by the Ministry of Education, Culture, Sports, Science and Technology. The Ministry has issued Course of Study for senior high schools, in which schools are required to appropriately use linguistic materials including approximately 900 words referring to seasons, months, days of the week, time, weather, number and basic words related to daily life. Expanding vocabulary is essential part of learning foreign languages, the process of which is not necessarily pleasant experience for learners because of time and energy consumed for it. In order to make this process more positive and efficient, some knowledge of affix --prefix and suffix-- could help especially for Japanese students since affix has functions similar to radicals in Japanese Kanji. This paper describes what kinds of prefixes and suffixes are frequently found in words in one English textbook. Through this study, I reached the conclusion that prefix mainly has a function of adding some meaning to the stem, while suffix has grammatical functions. I was also able to grasp the frequency of the usage of individual affix. I hope this study would help the teaching staff expand their students’ vocabulary. Keywords [Affix, Prefix, Suffix]

View full abstract

Abstract At National Institute of Technology, Miyakonojo College (Miyakonojo Kosen), students are required to take English Composition class and English Grammar class during the first two years, through which they learn basic English grammar and grammatical expressions including English usage. In order to make this process more efficient, the teaching staff need regularly to see what grammatical items are practically used in daily lives and to prioritize those items to be appropriately presented to the students. In the precedent paper, I studied grammatical trends in newspaper articles on general topics such as political issues, cultural events, science and technology. This paper describes what kinds of grammatical items and expressions are frequently used in English news. As a conclusion, I was able to grasp some tendency with grammatical items, confirm new usage of some conventional words and understand the basic construction pattern of some idioms. I hope this study would help the teaching staff organize more learner-friendly teaching programs. Keywords [English grammar, idiom, news]

View full abstract

[in Japanese]

View full abstract

Abstract In order to achieve regional contribution and solution of problems based on needs in local communities such as agriculture and so on, Miyakonojo College who is member of NIT (National Institute of Technology) have established <glocal education and research center for agricultural engineering< in 2017 to develop an educational system that can nurture a high creative engineer having social implementation ability and internationality. This paper introduces plans o f the center in the fiscal year of 2017 and reports the progress to date including the preparation state of a telecommunication program for the international education, a practice of agricultural engineering education for nurturing social implementation ability in graduation research and a case for regional contribution activity. In addition, the results of questionnaire surveys about this project that were conducted for the people both inside and outside of the college are analyzed and the future challenges are described. Keywords [Glocal education and research center for agricultural engineering, Social implementation ability, Internationality, NIT, Miyakonojo College]

View full abstract