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Satellite On-board Technologies for Next Generation Mobile Satellite Communication Systems
Mitsugi, Jin,Nakasuga, Yoshinori,Imaizumi, Yutaka,Suzuki, Yoshinori,Ueba, Masazumi 통신위성우주산업연구회 2003 Joint Conference on Satellite Communications Vol.2003 No.-
Next generation mobile satellite communications systems involve various types of traffic, including telephone, satellite SCADA and mobile hot spot traffic. The traffic will be broadband up to 1Gbps. To achieve such systems in the S band at affordable cost, innovations in satellite on-board technology will be required along with the adaptive modulation application. This paper introduces the concept of next generation mobile satellite communication and outline the requirements for the on-board equipment. It also presents a multi-beam feeder with a beam-group concept and an adaptive filter as enabling technology for such systems. The multi-beam feeder technique can provide sufficient satellite antenna gain all over the coverage area while enabling power to be focused on the needed beams. The communication capacity can be significantly enhanced with a meticulous resources assignment, which entails a complicated spectrum layout on the feeder link. The on-board adaptive filter allows the feeder link to be packed while maintaining the enhanced capacity.
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( Makoto Mitsugi ) 범태평양응용언어학회 2017 범태평양응용언어학회지 Vol.21 No.1
The purpose of this study is to investigate the effectiveness of two instruction methods for teaching polysemous English prepositions (at, in, on) and to explore learners` perception on learning tools used in the instruction when learning polysemous words. The first study investigated the effectiveness of schema-based instruction (SBI), which is a form of instruction based on the insights of cognitive linguistics (CL) and is a way of teaching, which provides learners with the schematic core meaning. Whereas, translation-based instruction (TBI) is one of the conventional ways of teaching prepositions as polysemous words, which offers learners a list of several meanings of each preposition. Two tests, as pre- and post-tests were carried out to examine the effectiveness of the instruction. A second study explored how leaners perceived the learning tools in each instruction method. The methods consist of the core schema and translations in dictionary, which were analyzed with the motivation to be able to conduct more effective instruction on polysemous words in the classroom. For this study, data was collected by a questionnaire and analyzed qualitatively to extract constructs that learners have on both instructions. Based on the results of these two studies, this paper argues that the core-schema approach to teaching English propositions is more effective than the conventional approach. Furthermore, the core schema approach is practical to administer to learners; however, it was discovered that learners perceived both benefits and disadvantages in the two instruction methods and suggested the necessity of separate-use depending on the learning situation.
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( Makoto Mitsugi ) 범태평양 응용언어학회 2018 범태평양응용언어학회지 Vol.22 No.1
The purpose of this study is to explore learners' perceptions on Schema-Based Instruction (SBI) for teaching the polysemous English prepositions (in, on, and at). SBI is a form of instruction based on the insights of cognitive linguistics and is a way of vocabulary learning and teaching, which provides learners with the schematic core meaning. The SBI has been expected to contribute to polysemous word learning, which is different from conventional ways of teaching polysemous words that most often offers learners a list of several prepositions and their corresponding meanings. The present study focuses on investigating learners’ perception, which is indispensable for discussing the effectiveness of instruction. A questionnaire was conducted with 56 Japanese university students after the SBI and a practical experience to use core meaning. Data were analyzed qualitatively to extract constructs that learners possess on SBI, especially on core meaning. Based on the results, the effective points of core meaning in SBI perceived by learners consisted of applicability, efficiency as a learning method or tool, and practical for distinguishing between the use of prepositions. However, due to reasons such as insufficient understanding, there were learners who negatively perceived core meaning and learners who could not determine the effectiveness of core meaning. Although most learners in this study received a positive impression on core meaning with one-shot instruction, this research revealed that learners recognized the needs of continual training or exercise to make use of core meaning in their English using or English learning context.
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( Sugie S. ),( Mitsugi M. ) 범태평양응용언어학회 2014 범태평양응용언어학회지 Vol.18 No.2
The Information and Communication Technology (ICT) utilization in Chinese as a "second" foreign language has mainly been focused on Learning Management System (LMS), digital material development, and quantitative analysis of learners`` grammatical knowledge. There has been little research that has analyzed the effectiveness of cross-cultural distance learning by the mixed methods. In this study, Chinese classes were instructed with blended learning which has three phases such as classroom teaching, Web-Based Training, and Cross-Cultural Distance Learning. This practice was based on an instructional design and a motivational design. This study aimed to explore the outcome of learning and learners`` experiences with the mixed methods. A quantitative analysis shows that Japanese students have already had high motivation from the beginning, and that learners who are anxious about communication skills have gained confidence through the interaction practices. As a qualitative analysis result, learners failed to communicate with Chinese students and felt that they lacked vocabulary, but experienced the use of Chinese in authentic contexts through the synchronous face-to-face interaction. They also improved in aggressiveness and motivation for learning Chinese. They fixed words and sentences which were learned in the classroom in the process of talking to different partners. All participants enjoyed the rare chance of interaction between young native speakers, and formed a positive impression of them.
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A proposal on the configuration of AFC applicable to a wide range of frequency offset
Yamashita, Fumihiro,Nakasuga, Yoshinori,Mitsugi, Jin,Ueba, Masazumi 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
Future mobile satellite communications systems will provide services to fast vehicles. Thus, the signal received by the user terminals may experience a wide frequency shift away from the assigned frequency that is caused by the Doppler shift and insufficient precision of the Oscillator. This paper presents a new auto-frequency control (AFC) configuration that is capable of removing a large amount of frequency offset (about ${\pm}$0.6 fs, where fs means symbol rate of signal). The operational principle of the AFC is described, and its BER performance and initial acquisition time are evaluated via computer simulation.
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Satomi Fujii,Makoto Mitsugi,Kaeko Nakamura,Yoshiyasu Ono,Toru Yamagami,Norihiko Takeuchi,Hiroki Ishizuka,Ronald Kibler 범태평양 응용언어학회 2022 범태평양응용언어학회지 Vol.26 No.2
This article reports on a mixed method study that investigated the differences in Japanese EFL (English as a foreign language) learners’ satisfaction toward two different online teaching formats incorporated in universities during the COVID-19 situation: synchronous online courses (n = 324) and asynchronous on-demand courses (n = 323). Applying the items of the previously developed online satisfaction scale in the literature of online learning to EFL learning contexts, this study examined learner satisfaction from three main factors, engaged learning, agency, and assessment, as a quantitative inquiry. According to the Mann-Whitney U test, there were significantly higher results of engaged learning and assessment in synchronous online courses than in asynchronous ondemand courses, indicating a higher level of learner satisfaction in synchronous online courses. In addition, based on the qualitative textmining analysis of learner comments on their perceptions of the online courses they had taken, findings suggest that synchronous online courses accounted for higher percentages of positive comments compared to those in the asynchronous on-demand courses. This study shows that synchronous online teaching ensured higher satisfaction among Japanese EFL learners than asynchronous on-demand courses.
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波多野智之,高木博己,稻垣三次 한국주조공학회 2004 한국주조공학회지 Vol.24 No.1
Die casting is “a process in which molten metal is injected at high velocity and pressure into a mold(die) cavity”. Casting with smooth surfaces, high dimensional precision, complicated shapes, and reduced weight can be obtained using this process. But this process is susceptible to casting defects such as porosities, scattered chilled layers, hard spots, etc. For preventing casting defects, we developed “low-velocity high pressure die casting technology”, “squeeze die casting technology”, “heat insulating sleeve lubricant technology”, and “direct pouring technology”. The “direct pouring technology”is useful for producing molten metal without oxide contamination. It consists of a pumping system which supplies pure molten metal to the die casting machine. By using this technology, we have successfully reduced oxide contamination in castings to 1/20 of that of our previous castings.
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