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Ikeda, A.,Minami, Y.,Fujita, K.,Takewaki, I. Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.4
A method of smart system identification of super high-rise buildings is proposed in which super high-rise buildings are modeled by a shear-bending system. The method is aimed at finding the story shear and bending stiffnesses of a specific story only from the horizontal floor accelerations. The proposed method uses a set of closed-form expressions for the story shear and bending stiffnesses in terms of the limited floor accelerations and utilizes a reduced shear-bending system with the same number of elements as the observation points. A difficulty of prediction of an unstable specific function in a low frequency range can be overcome by introducing an ARX model and discussing its relation with the Taylor series expansion coefficients of a transfer function. It is demonstrated that the shear-bending system can simulate the vibration records with a reasonable accuracy. It is also shown that the vibration records at two super high-rise buildings during the 2011 Tohoku (Japan) earthquake can be simulated with the proposed method including a technique of inserting degrees of freedom between the vibration recording points. Finally it is discussed further that the time-varying identification of fundamental natural period and stiffnesses can be conducted by setting an appropriate duration of evaluation in the batch least-squares method.
Investigation of anti-wear additives for synthetic esters
T. HASEGAWA,I. MINAMI,Y. KIDERA,K. HIRAO,M. MEMITA 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Antiwear (AW) properties of phoshphonic acid derivatives for trimethylolpropane (TMP) esters were investigated under boundary conditions. AW effect of dialkyl phosphonates depends on polarity of base fluid. They provide good AW performance in less polar TMP esters, whereas their AW effect is not sufficient in polar TMP esters. Amine sails of phosphonic acid were developed as new AW additive system for TMP esters. They provide excellent AW performance even in polar TMP esters.
Lubricating performance of vegetable oils as environmentally friendly fluids
K. MIMURA,S. MITSUMUNE,I. MINAMI 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Although vegetable oils provide good lubricity, they still need optimization by certain additive technology for practical applications. ZDTP improve antiwear properties of vegetable oils. However the additive performance depends on quality of the base oil. Antioxidants were applied to prevent the auto-oxidation of vegetable oils. Good synergistic effect of anti-wear and anti-oxidant additives was confirmed.
TRIBOLOGICAL PROPERTIES OF BIODEGRADABLE LUBRICATING OILS IN FOUR-BALL TEST
H. NADANO,M. NAKASAKO,M. KOHNO,I. MINAMI,Y. NODA 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
To clarify the tribological properties of biodegradable lubricating oils, the four-ball tests were carried out under dip-feed lubrication using a Soda-type four-ball machine. The test balls were lubricated with soybean oil, rapeseed oil, corn oil and turbine oil. From the tests, the coefficient of friction for all the test balls lubricated with biodegradable lubricating oils was lower than that for the test ball lubricated with turbine oil. Further, from the calculation of the pV value, it was clear that the seizure resistance for all the test balls lubricated with biodegradable lubricating oils was higher than that for the test ball lubricated with turbine oil.
other Korea Acute Myocardial Infarction Registry Investigators,Li, Y.J.,Rha, S.W.,Chen, K.Y.,Jin, Z.,Wang, L.,Ramasamy, S.,Poddar, K.L.,Minami, Y.,Park, J.Y.,Choi, C.U.,Oh, D.J.,Jeong, M.H. Japanese College of Cardiology 2012 Journal of cardiology Vol.59 No.1
Background: Whether low molecular weight heparin (LMWH) enoxaparin is equivalent to unfractionated heparin (UFH) in patients with non-ST-segment elevation myocardial infarction (NSTEMI) undergoing percutaneous coronary intervention (PCI) with drug-eluting stents (DES) remains unclear. Methods: A total of 2397 NSTEMI patients who underwent PCI with DES received either LMWH [n=1178, subcutaneous enoxaparin 1mg/kg, b.i.d., initiated after the patient's arrival and continued until 3-5 days after PCI plus reduced dose of UFH (50-70U/kg) during PCI] or UFH (n=1219, 24,000U/day infusion, initiated after the patient's arrival and continued until at least 48h after PCI). The bleeding events and clinical outcomes during in-hospital and at 8 months were compared. Results: Enoxaparin group had similar incidences of cardiac death, total death, and total major adverse cardiac events (MACE) at 8 months compared with UFH group. The incidences of major and minor bleeding events were also similar between the two groups. Multivariable Cox regression analysis showed that enoxaparin group had similar incidences of cardiac death [adjusted odds ratio (OR) 1.16, 95% confidence interval (CI) 0.64-2.10, p=0.620], total death (adjusted OR 1.08, 95% CI 0.66-1.76, p=0.760), and total MACE (adjusted OR 0.94, 95% CI 0.69-1.28, p=0.692) at 8 months as compared with UFH group. Conclusions: Enoxaparin with reduced dose of UFH only during PCI as an adjunctive antithrombotic therapy in NSTEMI patients undergoing PCI with DES was safe and showed comparable 8-month clinical outcomes as compared with UFH alone.