Risk Assessment of the Carbon Nanotube Group

This study assessed the health risks via inhalation and derived the occupational exposure limit (OEL) for the carbon nanotube (CNT) group rather than individual CNT material. We devised two methods: the integration of the intratracheal instillation (IT) data with the inhalation (IH) data, and the “biaxial approach.” A four‐week IH test and IT test were performed in rats exposed to representative materials to obtain the no observed adverse effect level, based on which the OEL was derived. We used the biaxial approach to conduct a relative toxicity assessment of six types of CNTs. An OEL of 0.03 mg/m³ was selected as the criterion for the CNT group. We proposed that the OEL be limited to 15 years. We adopted adaptive management, in which the values are reviewed whenever new data are obtained. The toxicity level was found to be correlated with the Brunauer‐Emmett‐Teller (BET)‐specific surface area (BET‐SSA) of CNT, suggesting the BET‐SSA to have potential for use in toxicity estimation. We used the published exposure data and measurement results of dustiness tests to compute the risk in relation to particle size at the workplace and showed that controlling micron‐sized respirable particles was of utmost importance. Our genotoxicity studies indicated that CNT did not directly interact with genetic materials. They supported the concept that, even if CNT is genotoxic, it is secondary genotoxicity mediated via a pathway of genotoxic damage resulting from oxidative DNA attack by free radicals generated during CNT‐elicited inflammation. Secondary genotoxicity appears to involve a threshold.     

Anti-racist pedagogy: from faculty’s self-reflection to organizing within and beyond the classroom

This article is a synthesis of my own work as well as a critical reading of the key literature in anti-racist pedagogy. Its purpose is to define anti-racist pedagogy and what applying this to courses and the fullness of our professional lives entails. I argue that faculty need to be aware of their social position, but more importantly, to begin and continue critical self-reflection in order to effectively implement anti-racist pedagogy, which has three components: (1) incorporating the topics of race and inequality into course content, (2) teaching from an anti-racist pedagogical approach, and (3) anti-racist organizing within the campus and linking our efforts to the surrounding community. In other words, anti-racist pedagogy is an organizing effort for institutional and social change that is much broader than teaching in the classroom.     

<文学改良刍议>考--关于文学革命

中国现代文学所迈出的艰辛的第一步,既有其充分的历史必然性,也与许多偶然因素的相叠密切关联.胡适与陈独秀的交往与共识,留美体验与文字论争,文学革命口号的变更与"八事”主张的提出,都为胡适<文学改良刍议>的产生和其后文学革命的开端提供了有效的铺垫和动力,而鲁迅<狂人日记>的发表,则标志着中国现代文学的真正诞生.     

Recent trends in humanoid robotics research: scientific background, applications, and implications

Even though the market size is still small at this moment, applied fields of robots are gradually spreading from the manufacturing industry to the others as one of the important components to support an aging society. For this purpose, the research on human-robot interaction (HRI) has been an emerging topic of interest for both basic research and customer application. The studies are especially focused on behavioral and cognitive aspects of the interaction and the social contexts surrounding it. As a part of these studies, the term of "roboethics" has been introduced as an approach to discuss the potentialities and the limits of robots in relation to human beings. In this article, we describe the recent research trends on the field of humanoid robotics. Their principal applications and their possible impact are discussed.     

A Choice Experiment Approach to the Valuation of Mortality

This paper presents an integrated framework for evaluating the reduction of several types of mortality risk using a Choice Experiment (CE) approach, a type of stated preference technique. Using this approach, we can distinguish the marginal willingness to pay (MWTP) for the amount of risk reduction from the MWTP for the opportunity of risk reduction and therefore calculate the “Quantity-based” Value of a Statistical Life. The risks in our survey include mortality risks due to accident, cancer, and heart disease. The Quantity-based VSL is calculated to be 350 million JPY (in 2002 Japanese Yen, about 2.9 million US dollars). Furthermore, we analyzed the influence of subjective risk perception and population characteristics of the respondents on their MWTP. Estimated results suggest that it is unnecessary to adjust the VSL according to the differences in the type of risk if the VSL is calculated using an adequate approach. However, adjustments for the timing of risk reduction and population characteristics are found to be significant for the execution of benefit transfer.JEL Classification: I18, D81, J17