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Arima, N.,Kim, S.,Kojima, M. Springer Science + Business Media 2016 Journal of optimization theory and applications Vol.168 No.3
<P>We propose the moment cone relaxation for a class of polynomial optimization problems to extend the results on the completely positive cone programming relaxation for the quadratic optimization model by Arima, Kim and Kojima. The moment cone relaxation is constructed to take advantage of sparsity of the polynomial optimization problems, so that efficient numerical methods can be developed in the future. We establish the equivalence between the optimal value of the polynomial optimization problem and that of the moment cone relaxation under conditions similar to the ones assumed in the quadratic optimization model.</P>
Kojima Tsukasa,Yamasaki Yuzo,Kamitani Takeshi,Yabuuchi Hidetake,Shirasaka Takashi,Shimomiya Yamato,Kondo Masatoshi,Hamasaki Hiroshi,Kato Toyoyuki,Nagao Michinobu,Honda Hiroshi 아시아심장혈관영상의학회 2019 Cardiovascular Imaging Asia Vol.3 No.1
Objective: The smallest diagnostically sufficient amount of contrast media (CM) should be used for coronary computed tomography angiography (CCTA) to minimize the risk of contrast- induced nephrotoxicity in elderly patients with coronary artery disease. The purpose of this study was to propose dynamic-CCTA using a low dose of CM and temporal maximum intensity projection (TMIP) and to investigate its image quality compared to standard-CCTA. Materials and Methods: Participants comprised 30 patients with coronary artery disease who underwent dynamic-CCTA and standard-CCTA using 320-row CT. Dynamic-CCTA was continuously performed at mid-diastole throughout 15–25 cardiac cycles after bolus injection of CM [103 mg iodine/kg body weight (mgI/kg)]. TMIP-CCTA was reconstructed from three-phase dynamic-CCTA data, including a phase with peak enhancement of the ascending aorta. Standard-CCTA was performed using a standard CM dose (259 mgI/kg). Image quality of both TMIP-CCTA and standard-CCTA was analyzed. Results: The amount of CM used in TMIP-CCTA and standard-CCTA was 16.2±2.6 mL and 40.1±7.3 mL, respectively. The mean effective radiation dose was not significantly different between the two methods. Mean coronary attenuation was significantly lower for TMIP-CCTA than standard-CCTA [346.9±82.8 Hounsfield units (HU) vs. 455.4±75.3 HU, p<0.05]. Image noise was significantly lower for TMIP-CCTA than standard-CCTA (20.0±3.2 HU vs. 28.1± 3.6 HU, p<0.05). There were no differences in signal-to-noise ratio and visual assessment scores between the two methods. Conclusion: TMIP-CCTA can be performed using more than 50% less CM with the same image quality as standard-CCTA.
Designing matching mechanisms under constraints: An approach from discrete convex analysis
Kojima, Fuhito,Tamura, Akihisa,Yokoo, Makoto Elsevier 2018 JOURNAL OF ECONOMIC THEORY Vol.176 No.-
<P><B>Abstract</B></P> <P>We consider two-sided matching problems where agents on one side of the market (hospitals) are required to satisfy certain distributional constraints. We show that when the preferences and constraints of the hospitals can be represented by an M<SUP>♮</SUP>-concave function, (i) the generalized Deferred Acceptance (DA) mechanism is strategyproof for doctors, (ii) it produces the doctor-optimal stable matching, and (iii) its time complexity is proportional to the square of the number of possible contracts. Furthermore, we provide sufficient conditions under which the generalized DA mechanism satisfies these desirable properties. These conditions are applicable to various existing works and enable new applications as well, thereby providing a recipe for developing desirable mechanisms in practice.</P>
AGING IN JAPAN : POPULATION POLICY IMPLICATIONS
KOJIMA, HIROSHI Institute for Social Development and Policy Resear 1995 Korea Journal of Population and Development Vol.24 No.2
This paper describes the trends in population aging in Japan and its demographic determinants and consequences. It discusses the sociocultural contexts of aging with special reference to the family. Then, it presents the results of multinomial logit analysis of data from the National Opinion Survey on Population Issues conducted by the Institute of Population Problems in 1990 to explore the possible acceptance of alternative population policies to slow populating aging.
Kojima, Takahiko,Inui, Yuji,Miyazaki, Soushi,Shiro, Motoo,Fukuzumi, Shunichi Royal Society of Chemistry 2009 Chemical communications Vol.2009 No.43
<P>A novel tetranuclear Ir(<SMALL>III</SMALL>) complex involving unprecedented coordination modes of alloxazine formed a closed π-space by intermolecular hydrogen bonding and the counter anions encapsulated in the space could be exchanged <I>via</I> self-assembly.</P> <P>Graphic Abstract</P><P>A novel tetranuclear Ir(<SMALL>III</SMALL>) complex involving unprecedented coordination modes of alloxazine formed a closed π-space by intermolecular hydrogen bonding; counter anions encapsulated in the space could be exchanged <I>via</I> self-assembly. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b911033j'> </P>
Economic Evaluation of A CGS with Energy Storage Systems
Kojima, Yoshihide,Kato, Masakazu The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.1
Problems such as global warming and resource depletion are becoming more and more serious. End consumers are required to reduce CO2 emissions and to make effective use of energy. As measures, cogeneration systems (CGSs) and energy storage systems including heat storage and battery are considered. In this paper, optimum facility planning and economy evaluation has been performed by linear programming for a CGS with energy storage systems.