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Matsumoto, Naoko,Hirota, Tomoya,Sugiyama, Koichiro,Kim, Kee-Tae,Kim, Mikyoung,Byun, Do-Young,Jung, Taehyun,Chibueze, James O.,Honma, Mareki,Kameya, Osamu,Kim, Jongsoo,Lyo, A-Ran,Motogi, Kazuhito,Oh, C IOP Publishing 2014 ASTROPHYSICAL JOURNAL LETTERS - Vol.789 No.1
<P>We have carried out the first very long baseline interferometry (VLBI) imaging of a 44 GHz class I methanol maser (70-61A(+)) associated with a millimeter core MM2 in a massive star-forming region IRAS 18151-1208 with KaVA (KVN and VERA Array), which is a newly combined array of KVN (Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). We have succeeded in imaging compact maser features with a synthesized beam size of 2.7 milliarcseconds x 1.5 milliarcseconds (mas). These features are detected at a limited number of baselines within the length of shorter than approximate to 650 km corresponding to 100 M. in the uv-coverage. The central velocity and the velocity width of the 44 GHz methanol maser are consistent with those of the quiescent gas rather than the outflow traced by the SiO thermal line. The minimum component size among the maser features is similar to 5 mas x 2 mas, which corresponds to the linear size of similar to 15 AU x 6 AU assuming a distance of 3 kpc. The brightness temperatures of these features range from similar to 3.5 x 10(8) to 1.0 x 10(10) K, which are higher than the estimated lower limit from a previous Very Large Array observation with the highest spatial resolution of similar to 50 mas. The 44 GHz class I methanol maser in IRAS 18151-1208 is found to be associated with the MM2 core, which is thought to be less evolved than another millimeter core MM1 associated with the 6.7 GHz class II methanol maser.</P>
Matsumoto, Shuichi,Hosozawa, Osamu,Narihara, Hiroyuki,Komuro, Tsutomu,Kawamoto, Shin-ichiro Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.1
In recent years, the performance requested for which an ultra-high rise buildings is diversified. Large spans are designed in order to gain wide workspace. Column positions are shifted in middle stories to provide space different from neighboring floors. Moreover, in the bottom layers of the building, it is becoming more important to expand freedom to plan flexibility such as creating publically opened wide atria that gives attractive free space. Earthquake-proof criteria is also changing not only human life protection deign but also a design that allows functional continuity. In order to achieve thee needs, as one of technology, we have developed ultra-high strength concrete filled tubular (CFT) columns of the box section that combine ultra-high strength concrete with specified strength of $150N/mm^2$ and ultra-high strength steel material with tensile strength of $780N/mm^2$. In this paper, the outline of development of an ultra-high strength CFT column is reported. Also, the structural design of the ultra-high-rise building using the CFT columns is reported.
Devising a Training Method for Assembly Work by Employing Disassembly
Osamu Ichikizaki,Ryou Kubota,Toshikazu Komori,Toshiyuki Matsumoto,Akihiro Erikawa 대한산업공학회 2013 Industrial Engineeering & Management Systems Vol.12 No.4
Efficiency in work training is a perennial issue due to high-diversity low-volume production, particularly for manufacturers producing office machines which are manually assembled by workers. To reduce the training cost, parts used in training are usually reused; a trainer disassembles a product assembled by a worker in training. This paper proposes a training method that employs disassembly usually performed by a trainer. This method assigns both assembly and disassembly to a worker in training, in contrast to the conventional method. The effectiveness of the proposed method is experimentally discussed in terms of learning assembly motions and work procedure at each learning stage, namely, “undergoing learning,” “immediately after learning,” and “seven days after learning.” The effectiveness of the training method is confirmed. The method improves the stability of work procedure recollection immediately after training. Furthermore, at seven days after training, it improves retention of the assembly motions and work procedure, and also promotes and maintains memory related to product structure.
Kyphosis Progression after Balloon Kyphoplasty Compared with Conservative Treatment
Keiichiro Iida,Katsumi Harimaya,Kiyoshi Tarukado,Osamu Tono,Yoshihiro Matsumoto,Yasuharu Nakashima 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.6
Study Design: Retrospective cohort study (level of evidence: 4). Purpose: To demonstrate the effects of balloon kyphoplasty (BKP) on prevention of kyphosis progression. Overview of Literature: Kyphoplasty can correct local kyphosis (fractured vertebra), but its efficacy is attenuated by adjacent fracture and/or disc height reduction with endplate damage. With these attenuating factors incorporated, a comparison between BKP and conservative treatment is necessary to verify the effect of BKP on kyphosis correction. Methods: This study retrospectively analyzed 129 patients treated conservatively and 95 treated with BKP in our institution. The rate of new adjacent fracture occurrence was determined using Kaplan–Meier analysis. We examined the progression of local kyphosis in patients who underwent lateral X-ray after 1 year. Local kyphosis was measured as an angle between higher end plate of the vertebra above and lower end plate of the vertebra below the fractured vertebra. The comparison included 45 patients treated conservatively and 58 treated with BKP. Results: The incidence of new adjacent fracture at 1 year was 7.3% in the conservative treatment group and 23.2% in the BKP group (p<0.001), while the progression of local kyphosis at 1 year was 5.7°±4.7° and 3.2°±4.6°, respectively (p=0.01). Relative to conservative treatment, local kyphosis did not progress after BKP, despite the higher incidence of adjacent fracture. Local kyphosis progressed in cases with adjacent fracture compared with those without adjacent fracture (6.0°±4.3° vs. 2.1°±4.3°, p=0.003), and fractured vertebral instability was found to be a risk factor for adjacent fracture in BKP. Conclusions: Compared with the conservative treatment, BKP suppressed the progression of local kyphosis. However, an adjacent fracture attenuated the BKP correction and was more frequently seen in patients with unstable vertebral fractures.
Tomoaki Yamazaki,Rui Yin,Seisuke Kawaguchi,Hirotatsu Hayasaka,Toshiyuki Matsumoto,Osamu Ichikizaki,Takashi Kanazawa 대한산업공학회 2012 Industrial Engineeering & Management Systems Vol.11 No.3
Environments surrounding production sites have changed greatly in recent years. Accommodating environmental changes calls for the design and development of information systems that center on production lines. There is a need for a training program that teaches learners to understand the particulars of an operation and apply that knowledge to an information system. In this research, we used material requirements planning (MRP) as the subject for which basic skills are to be taught and developed an MRP exercise-based training program. The program is designed for 13 lectures of 90 minutes each, and it consists of MRP exercises, modeling methods to represent them, the use of a programming language for system development, and finally, evaluation of the exercises. Lecture materials are described in 505 lecture slides using Microsoft PowerPoint to allow visualization of topics through graphs and models. The developed training program was then delivered to 86 college students, and its results were measured through quizzes to verify educational effectiveness.
Development of Wheeled Inverted Pendulum Type Personal Mobility with Pedal
Seonghee Jeong,Yuji Masuda,Yutaka Hiroi,Takayuki Takahashi,Osamu Matsumoto 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
In this paper, the mechanism and basic driving function of a wheeled inverted pendulum-type personal mobility with a pedal (Wi-PMP) are described. The mobility consists of a wheeled inverted pendulum-type mobile platform and a leg rowing mechanism, and thus it can be driven by a rider’s leg rowing motion. Moreover, to retain the merits of pivot turning of a parallel two-wheeled mobility, a differential gear box and a one-way clutch are installed between the pedal and the wheel shafts. It is designed such that a rider can ground his feet while sitting on the saddle. In addition, the Wi-PMP is compact and light-weight, and thus it can be driven and parked in a narrow space. Through experiments using three types of driving mode(motor driving, pedal driving, and assist driving), it was confirmed that mobility can realize all driving modes and pivot turning while keeping the feet of the rider on the pedals.
Yamazaki, Tomoaki,Yin, Rui,Kawaguchi, Seisuke,Hayasaka, Hirotatsu,Matsumoto, Toshiyuki,Ichikizaki, Osamu,Kanazawa, Takashi Korean Institute of Industrial Engineers 2012 Industrial Engineeering & Management Systems Vol.11 No.3
Environments surrounding production sites have changed greatly in recent years. Accommodating environmental changes calls for the design and development of information systems that center on production lines. There is a need for a training program that teaches learners to understand the particulars of an operation and apply that knowledge to an information system. In this research, we used material requirements planning (MRP) as the subject for which basic skills are to be taught and developed an MRP exercise-based training program. The program is designed for 13 lectures of 90 minutes each, and it consists of MRP exercises, modeling methods to represent them, the use of a programming language for system development, and finally, evaluation of the exercises. Lecture materials are described in 505 lecture slides using Microsoft PowerPoint to allow visualization of topics through graphs and models. The developed training program was then delivered to 86 college students, and its results were measured through quizzes to verify educational effectiveness.