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Search Results: 1 - 10 of 792 matches for " Keisuke Hanaki "
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Influential Factors on Pro-Environmental Behaviors—A Case Study in Tokyo and Seoul  [PDF]
Hyunsook Lee, Kiyo Kurisu, Keisuke Hanaki
Low Carbon Economy (LCE) , 2013, DOI: 10.4236/lce.2013.43011
Abstract:

To develop the low-carbon society, in addition to the efforts by industrial and commercial sectors, promotion of people’s pro-environmental behaviors (PEBs) has become one of the key issues. Some PEBs have been investigated in previous studies, however, the targets were limited to particular behaviors (i.e., recycling, water saving, electricity saving). The holistic view of understanding the characteristics of PEBs has remained insufficient. In this study, we selected 58 daily PEBs from various fields and investigated people’s practice rates and attitudes in Seoul and Tokyo. The questionnaire surveys were conducted and 2393 (Seoul) and 2220 (Tokyo) valid responses were analyzed. Most PEBs had significantly different practice rates between Seoul and Tokyo. It can be concluded that the surrounding conditions, such as policy and infrastructure, have some influences on these differences. The positions of the reasons to practice or not to practice PEBs were visualized using multiple correspondence analyses. The results indicated that the monetary reason was the common factor for many PEBs, while some PEBs showed different reasons. The socio-demographic effects were not significantly

Application of LCA by Using Midpoint and Endpoint Interpretations for Urban Solid Waste Management  [PDF]
Sora Yi, Kiyo H. Kurisu, Keisuke Hanaki
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.512107
Abstract: Life cycle assessment (LCA) is one of the most widely used methods of decision support. However, few studies have examined whether stakeholders prefer midpoint or endpoint approaches. In this regard, the present study examines the attitudes toward urban solid waste management, environmental issues, and scenario evaluations by using midpoint and endpoint interpretations of LCA results. This study introduces three types of social groups that typically respond to environmental conflicts: the individualist, hierarchist, and egalitarian groups. Although residents are likely to recognize global impacts as the most important issue, their view is likely to change depending on system and avoided emissions. Consistent with the Seoul Metropolitan Area’s new policy designed to increase the incineration ratio, almost half of all respondents preferred the scenario. Noteworthy is that the respondents’ preference for midpoint and endpoint decision-making tools is not consistent with that in previous studies. Most of the respondents indicated that the midpoint approach would be better in evaluating environmental systems.
The Effect of Information Provision on Pro-Environmental Behaviors  [PDF]
Hyunsook Lee, Kiyo Kurisu, Keisuke Hanaki
Low Carbon Economy (LCE) , 2015, DOI: 10.4236/lce.2015.62005
Abstract: To reduce the environmental load of the household sector, it is important to enhance people’s pro-environmental behaviors (PEBs). Information provision has been considered as one of the possible methods for fostering PEBs. However, previous studies have seldom discussed what type of information is most appropriate for the target behavior. Effective media through which to provide such information should be also discussed. In order to identify the most effective such information, as well as the effectiveness of free papers as media through which to disseminate it, environmental information regarding two behaviors—“My Cup” and “Carbon Cashbag”—was provided through online questionnaires and free papers. Even though the same information was provided in both sources, it was found that the effectiveness of the content depended on the target behavior and region. As lack of information was one of the barriers to “Carbon Cashbag” behavior, it was found that the provision of very basic information improved the intention and practice of the behavior. Higher scores for intention and practice were observed when information was provided through free papers, which could therefore be considered as effective media through which to deliver information about PEBs.
Evaluation of Rice Husk Use Scenarios Incorporating Stakeholders’ Preferences Revealed through the Analytic Hierarchy Process in An Giang Province, Vietnam  [PDF]
Pham Thi Mai Thao, Kiyo H. Kurisu, Keisuke Hanaki
Low Carbon Economy (LCE) , 2014, DOI: 10.4236/lce.2014.53010
Abstract:

To process biomass energy successfully, it is necessary to incorporate a number of criteria that can be assessed either quantitatively or qualitatively for various biomass scenarios. It is also important to take into account the local people’s preferences and interests in the decision-making process. In this study, preferences of various stakeholders on rice husk use, such as urban households, rural households, rice mill owners, brick kiln owners, government officials, and scientists, were investigated using the Analytic Hierarchy Process. The results were incorporated with objective evaluation that was derived from Life Cycle Assessment. A holistic evaluation of rice-husk use scenarios was conducted. The results showed that rural households, rice mill owners, and brick kiln owners still want to use rice husk in conventional ways, while urban households, government officials, and scientists prefer to use rice husk with new technologies. The results reveal the aspects that each stakeholder thinks important and the conflicts between stakeholders. These can help government officials grasp the preferences of the local people which is important information for decision-making.

Spillover Effect on Families Derived from Environmental Education for Children  [PDF]
Ai Hiramatsu, Kiyo Kurisu, Hiroshi Nakamura, Shuichi Teraki, Keisuke Hanaki
Low Carbon Economy (LCE) , 2014, DOI: 10.4236/lce.2014.52005
Abstract:

Facing the challenge of global warming, greater importance has been placed on learning energy and environment in schools and the energy-saving behaviors of children and their families are encouraged. The authors implemented energy environmental education programs with visualization in elementary and junior high schools, and surveyed changes in the awareness and behavior of children and their families. As for children, the results showed that the programs increased the awareness of effectiveness, while almost no change was observed in other factors. The psychological factors impacting intention and behavior in children were attitude, expectations from parents and expansion of interest. Indicating spillover effect on families derived from education of children, psychological factors and behavior of parents were improved. Awareness of effectiveness and behavior of children had significant effects to the most psychological factors of parents, leading to intentional and behavioral change. Furthermore, behavior of parents got influenced by expectations from children. It was also indicated that the higher the awareness of the child is, the greater the spillover effect on the family as a result of education is.

The Role of Socio-Economic Factors on Household Waste Generation: A Study in a Waste Management Program in Dhaka City, Bangladesh
Rafia Afroz,Keisuke Hanaki,Rabbah Tuddin
Research Journal of Applied Sciences , 2012, DOI: 10.3923/rjasci.2010.183.190
Abstract: Information on waste generation, socio economic characteristics and willingness of the households towards waste separation of waste were obtained from interviews with 402 respondents in Dhaka city. Ordinary Least Square (OLS) regression was used to determine the dominant factors that might influence the waste generation of the households. The results showed that the waste generation of the households in Dhaka city was significantly affected by household size, income, concern about the environment and willingness to separate the waste. These factors are necessary to effectively improve waste management, growth and performance as well as to reduce the environmental degradation of the household waste.
Low level ?-lactamase production in methicillin-resistant staphylococcus aureus strains with ?-lactam antibiotics-induced vancomycin resistance
Yuriko Hirao, Yurika Ikeda-Dantsuji, Hidehito Matsui, Masaki Yoshida, Seiji Hori, Keisuke Sunakawa, Taiji Nakae, Hideaki Hanaki
BMC Microbiology , 2012, DOI: 10.1186/1471-2180-12-69
Abstract: Five randomly selected laboratory stock BIVR strains showed an undetectable level of ?-lactamase activity and were blaZ-negative. Five non-BIVR stock strains showed an average ?-lactamase activity of 2.59?±?0.35 U. To test freshly isolated MRSA, 353 clinical isolates were collected from 11 regionally distant hospitals. Among 25 BIVR strains, only 16% and 8% were blaZ positive and ?-lactamase-positive, respectively. In contrast, 95% and 61% of 328 non-BIVR strains had the blaZ gene and produced active ?-lactamase, respectively. To know the mechanism of low ?-lactamase activity in the BIVR cells, they were transformed with the plasmid carrying the blaZ gene. The transformants still showed a low level of ?-lactamase activity that was several orders of magnitude lower than that of blaZ-positive non-BIVR cells. Presence of the ?-lactamase gene in the transformants was tested by PCR amplification of blaZ using 11 pairs of primers covering the entire blaZ sequence. Yield of the PCR products was consistently low compared with that using blaZ-positive non-BIVR cells. Nucleotide sequencing of blaZ in one of the BIVR transformants revealed 10 amino acid substitutions. Thus, it is likely that the ?-lactamase gene was modified in the BIVR cells to downregulate active ?-lactamase production.We concluded that BIVR cells gain vancomycin resistance by the elimination or inactivation of ?-lactamase production, thereby preserving ?-lactam antibiotics in milieu, stimulating peptidoglycan metabolism, and depleting free vancomycin to a level below the minimum inhibitory concentration of vancomycin.
Autonomy, Conformity and Organizational Learning
Nobuyuki Hanaki,Hideo Owan
Administrative Sciences , 2013, DOI: 10.3390/admsci3030032
Abstract: There is often said to be a tension between the two types of organizational learning activities, exploration and exploitation. The argument goes that the two activities are substitutes, competing for scarce resources when firms need different capabilities and management policies. We present another explanation, attributing the tension to the dynamic interactions among search, knowledge sharing, evaluation and alignment within organizations. Our results show that successful organizations tend to bifurcate into two types: those that always promote individual initiatives and build organizational strengths on individual learning and those good at assimilating the individual knowledge base and exploiting shared knowledge. Straddling the two types often fails. The intuition is that an equal mixture of individual search and assimilation slows down individual learning, while at the same time making it difficult to update organizational knowledge because individuals’ knowledge base is not sufficiently homogenized. Straddling is especially inefficient when the operation is sufficiently complex or when the business environment is sufficiently turbulent.
A modular absolute bound condition for primitive association schemes
Akihide Hanaki,Ilia Ponomarenko
Mathematics , 2007,
Abstract: The well-known absolute bound condition for a primitive symmetric association scheme (X,S) gives an upper bound for |X| in terms of |S| and the minimal non-principal multiplicity of the scheme. In this paper we prove another upper bounds for |X| for an arbitrary primitive scheme (X,S). They do not depend on |S| but depend on some invariants of its adjacency algebra KS where K is an algebraic number field or a finite field.
Analysis of Dose Calculation Accuracy in Cone Beam Computed Tomography with Various Amount of Scattered Photon Contamination  [PDF]
Keisuke Usui, Koichi Ogawa, Keisuke Sasai
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2017, DOI: 10.4236/ijmpcero.2017.63022
Abstract: Cone-beam computed tomography (CBCT) images have inaccurate CT numbers because of scattered photons. Thus, quantitative analysis of scattered photons that affect an electron density (ED) curve and calculated doses may be effective information to achieve CBCT-based radiation treatment planning. We quantitatively evaluated the effect of scattered photons on the accuracy of dose calculations from a lung image. The Monte Carlo method was used to calculate CBCT projection data, and we made two calibration curves for conditions with or without scattered photons. Moreover, we applied cupping artifact correction and evaluated the effects on image uniformity and dose calculation accuracy. Dose deviations were compared with those of conventional CT in conventional and volumetric intensity modulated arc therapy (VMAT) planning by using γ analysis and dose volume histogram (DVH) analysis. We found that cupping artifacts contaminated the scattered photons, and the γ analysis showed that the dose distribution was most decreased for a scattered photon ratio of 40%. Cupping artifact correction significantly improved image uniformity; therefore, ED curves were near ideal, and the pass rate results were significantly higher than those associated with the scattered photon effect in 65.1% and 78.4% without correction, 99.5% and 97.7% with correction, in conventional and VMAT planning, respectively. In the DVH analysis, all organ dose indexes were reduced in the scattered photon images, but dose index error rates with cupping artifact correction were improved within approximately 10%. CBCT image quality was strongly affected by scattered photons, and the dose calculation accuracy based on the CBCT image was improved by removing cupping artifacts caused by the scattered photons.
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