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PROPOSAL OF COOPERATIVE STUDY TOWARD ESTABLISHING ASIACATALYST
Niwa, Miki 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
Cooperative studies on $quot;Reference Catalyst$quot; in Japan have proven to be very important and useful not only for characterization of catalysts but also for standardization of characterization techniques. This recognition has motivated us to propose $quot;Asiacatalyst$quot;, an extended version of Reference Catalyst, for similar cooperative activities in Asian countries.
Recent Development in Embryo Technology in Pigs - Review -
Niwa, K.,Funahashi, H. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.6
Technologies on preimplantation porcine embryos have been developed quickly and significantly. Successful development of systems for culture of porcine zygotes to the blastocyst stage has made it possible to utilize follicular oocytes for in vitro production of embryos and thus stimulated research on various embryo technologies. Recent technological development of embryo cryopreservation, separation of X- and Y-bearing spermatozoa and non-surgical embryo transfer has also made it easy to utilize in vivo- and in vitro-produced embryos for artificial manipulation to produce clones and transgenic pigs. Further progress in overcoming various problems associated with each embryo technology will result in acceptable efficiency to utilize porcine embryos with a high or increased quality. Combining these technologies will accelerate further expansion of the swine industry not only for meat production but also for the production of therapeutic recombinant proteins and xonografts.
Ryoko Niwa,Keisuke Takai,Makoto Taniguchi 대한척추신경외과학회 2021 Neurospine Vol.18 No.1
Objective: Although a retro-odontoid pseudotumor associated with rheumatoid arthritis is a well-known clinical entity, little is known about retro-odontoid pseudotumors not associated with rheumatoid arthritis due to their rarity. Methods: Between 2006 and 2019, consecutive patients with nonrheumatoid pseudotumors were included and retrospectively compared with patients with rheumatoid pseudotumors. Results: Nineteen patients had nonrheumatoid pseudotumors (mean age, 73±6 years; male, 53%). All had cervical lesions including ossified anterior and posterior longitudinal ligaments with a history of cervical surgery in 5. The mean thickness of the pseudotumors at diagnosis was 8.1 mm (range, 4.2–17.2 mm). Pseudotumor thickness had a significant negative correlation with the atlantodental interval (p=0.008) and the subaxial range of motion (p=0.049). In comparison with 7 rheumatoid pseudotumor patients, nonrheumatoid pseudotumor patients were older (p=0.042), had a higher proportion of males (p=0.023), had a smaller atlantodental interval (p=0.007), and had larger pseudotumors at diagnosis (p=0.030). Of the 19 patients, 18 received posterior fixation with or without C1 laminectomy, while the other received C1 laminectomy alone. The percent pseudotumor thickness at follow-up to those at diagnosis was 91%, 77%, 68%, 46%, 58%, and 49% at 1, 3, 6, 12, 24, and 36 months after surgery, respectively. Conclusion: This study revealed markedly clinical and radiological differences between nonrheumatoid and rheumatoid pseudotumors. The main etiology for nonrheumatoid pseudotumors was subaxial cervical degeneration and ossified lesions. There were good outcomes following posterior fixation and time-dependent pseudotumor regression within 12 months.
Koichiro Niwa 대한심장학회 2013 Korean Circulation Journal Vol.43 No.4
Bicuspid aortic valve and/or coarctation of the aorta are consistently associated with ascending aortic and para-coarctation medial ab-normalities. Medial abnormalities in the ascending aorta are prevalent in other types of patients with a variety of forms congenital heart disease (CHD), such as single ventricle, persistent truncus arteriosus, transposition of the great arteries, hypoplastic left heart syndrome, te-tralogy of Fallot. These abnormalities encompass a wide age range, and may predispose to dilatation, aneurysm, and rupture that necessi-tates aortic valve and root surgery. This dilatation can develop in CHD patients without stenotic region. These CHDs exhibit ongoing dilatation of the aortic root and reduced aortic elasticity and increased aortic stiffness that may relate to intrinsic properties of the aortic root. The concept of aortic dilatation is shifting a paradigm of aortic dilatation, as so called post stenotic dilatation, to primary intrinsic aortopahy. These aortic dilatation and increased stiffness can induce aortic aneurysm, rupture of the aorta and aortic regurgitation, but also provoke left ventricular hypertrophy, reduced coronary artery flow and left ventricular failure. We can recognize this association of aortic pathophysiological abnor-mality, aortic dilation and aorto-left ventricular interaction as a new clinical entity: “aortopathy”.
Locomotion Control of Multi-Legged Robot based on Follow-the-Contact-Point Gait
Tomoya Niwa,Shinkichi Inagaki,Tatsuya Suzuki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a new control scheme of decentralized multi-legged robot based on Follow-the-Contact-Point(FCP) gaitcontrol. In this control scheme, the first legs contact the points allocated on the terrain and the following legs touch the foot on the point which the fore leg is contacting. By creating adequate contacting points on the environ-ment, the robot can benavigated successfully. Since the position in for mation of the contacting points is relayed based on physical in for mation of the legs, each leg does not need the global position of the contacting point. As a result, the pro-posed control scheme realizes decentralized architecture. This paper in troduces the control law for the robot walking one venter rain. Finally, the result of physicals imulation of 20-legged robot shows the availability of the proposed method.