THE MILITARY AND INCARCERATION: HIDDEN MECHANISMS OF RACIAL INEQUALITY IN THE U.S. LABOR MARKET, 1980-2010.

U.S. incarceration since the 1980s is increasingly concentrated among black men, reinforcing their racial inequality in the labor market. However, less attention has been paid to the fact that the military, which provided employment, income and educational opportunities to black men disproportionately, has downsized at the same time during this same period. Mass incarceration has rarely been studied in relation to military downsizing. I seek to understand how prison and the military, two crucial but often-neglected labor market institutions, have jointly influenced racial inequality in the labor market over time along with other major institutions such as higher education and long-term unemployment. The simultaneous increase in mass incarceration and decrease in the military since 1980 has resulted in a crossover of the two populations of affiliated black men in the early 1990s. As a result of institutional change at the aggregate level, I argue that young black men, in particular, who enter the current labor market face different opportunity structures from those who entered the labor market in the early 1980s. This military-penal crossover has reinforced racial inequality in the labor market, with blacks experiencing more incarceration while decreasingly enlisting in the military now than before. In the dissertation, I answer the following three questions: (1) Who enters into which institution and how are the selection process is different across race? (2) What are the consequences of the simultaneous shift of mass incarceration and military downsizing on black men’s mobility? (3) What are their subsequent labor market trajectories after military service and incarceration and how are the trajectories different for blacks and whites? This research contributes to the current literature by revealing how these traditionally unrecognized labor market institutions have shaped unequal paths for blacks and for whites

Design of 6U Nanosatellites in Formation Flying for the Laser Crosslink Mission

With a recent growth in the volume of spaceborne data, free space optical (FSO) or laser communication systems are attracting attention, as they can enable super-high data rates faster than 1 Gbps. The Very high-speed Inter-satellite link Systems using Infrared Optical terminal and Nanosatellite (VISION) is a technical demonstration mission to establish and validate laser crosslink systems using two 6U nanosatellites in formation flying. The final goal is to achieve a Gbps-level data rate at a distance of thousands of kilometers. To establish space-to-space laser communication, the payload optical axes of each satellite should be precisely aligned during the crosslink. The payload is the laser communication terminal (LCT) including the deployable space telescope (DST), which improves optical link performances. The 6U nanosatellite bus is designed with commercial off-the shelf-(COTS) components for agile systems development. For precise formation flying, the bus is equipped a with relative navigation system with a GNSS receiver and RF crosslink, star tracker, 3-axis reaction wheels (RWs), and propulsion system. This proposed concept of the laser crosslink systems will contribute to the construction of the LEO communication constellation with high speed and secure links in future

Differences in salient beliefs associated with voluntary exercise training among South Korean firefighters before and after COVID-19

Background : Participating in voluntary exercise training is important to meet occupational requirements as well as firefighters’ health and safety. The purpose of this study is to identify salient beliefs associated with voluntary exercise training among firefighters in the pandemic era by comparing outcomes with those from a previous elicitation study, which was carried out before the COVID-19 outbreak. Methods : A total of 57 firefighters are recruited to participate in an elicitation study. Participants are requested to respond to six open-ended questions related to voluntary exercise training. Content analysis is used to create categories that combine similar factors in each belief. Beliefs mentioned by more than 30% of participants are used for comparison with the results of the previous research. Results : “Improves my physical ability” (n = 44) and “cause injury” (n = 17) are identified as behavioral beliefs in the present study, whereas “makes me tired” and “takes too much time” were also elicited in Lee’s study. Normative beliefs are “family members” (n = 45) and “colleagues” (n = 27) and these results are consistent with those in Lee’s study. “Lack of time” (n = 28), “exercise facilities” (n = 19), and “COVID-19” (n = 19) are elicited as control beliefs in the present study, whereas “physical condition” (n = 21) and “exercise partners” (n = 14) were elicited as other control beliefs, and “COVID-19” was not mentioned in Lee’s study. Conclusion : This study can contribute valuable information about salient beliefs associated with exercise training behavior among firefighters, particularly under pandemic conditions. Future researchers should develop tailored exercise training programs for firefighters based on current elicited beliefs.This research was supported by the Emergency Response to Disaster sites Research and Development Program funded by National Fire Agency(20013968)

Coronary Computed Tomographic Angiography at 80 kVp and Knowledge-Based Iterative Model Reconstruction Is Non-Inferior to that at 100 kVp with Iterative Reconstruction

The aims of this study were to compare the image noise and quality of coronary computed tomographic angiography (CCTA) at 80 kVp with knowledge-based iterative model reconstruction (IMR) to those of CCTA at 100 kVp with hybrid iterative reconstruction (IR), and to evaluate the feasibility of a low-dose radiation protocol with IMR. Thirty subjects who underwent prospective electrocardiogram-gating CCTA at 80 kVp, 150 mAs, and IMR (Group A), and 30 subjects with 100 kVp, 150 mAs, and hybrid IR (Group B) were retrospectively enrolled after sample-size calculation. A BMI of less than 25 kg/m2 was required for inclusion. The attenuation value and image noise of CCTA were measured and the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated at the proximal right coronary artery and left main coronary artery. The image noise was analyzed using a non-inferiority test. The CCTA images were qualitatively evaluated using a four-point scale. The radiation dose was significantly lower in Group A than Group B (0.69 ± 0.08 mSv vs. 1.39 ± 0.15 mSv, p < 0.001). The attenuation values were higher in Group A than Group B (p < 0.001). The SNR and CNR in Group A were higher than those of Group B. The image noise of Group A was non-inferior to that of Group B. Qualitative image quality of Group A was better than that of Group B (3.6 vs. 3.4, p = 0.017). CCTA at 80 kVp with IMR could reduce the radiation dose by about 50%, with non-inferior image noise and image quality than those of CCTA at 100 kVp with hybrid IR

Stretchable and transparent electrodes based on in-plane structures

Stretchable electronics has attracted great interest with compelling potential applications that require reliable operation under mechanical deformation. Achieving stretchability in devices, however, requires a deeper understanding of nanoscale materials and mechanics beyond the success of flexible electronics. In this regard, tremendous research efforts have been dedicated toward developing stretchable electrodes, which are one of the most important building blocks for stretchable electronics. Stretchable transparent thin-film electrodes, which retain their electrical conductivity and optical transparency under mechanical deformation, are particularly important for the favourable application of stretchable devices. This minireview summarizes recent advances in stretchable transparent thin-film electrodes, especially employing strategies based on in-plane structures. Various approaches using metal nanomaterials, carbon nanomaterials, and their hybrids are described in terms of preparation processes and their optoelectronic/mechanical properties. Some challenges and perspectives for further advances in stretchable transparent electrodes are also discussed. &amp;#169; 2015 The Royal Society of Chemistry.open0

How Does Family Involvement Affect Environmental Innovation? A Socioemotional Wealth Perspective

The purpose of this study was to examine how family involvement affects the environmental innovation of firms. While prior studies have shown that family involvement can enhance environmental performance, these environmental performances have been portrayed as firm activities to prevent environmental issues, such as air pollution, CO2 emissions, etc. We maintain that environmental performance should be more proactive and enable firms to transform their activities more fundamentally towards environmental protection. In this sense, we consider environmental innovation, i.e., technological development to address environmental issues, as a proactive measure enacting firm activities to address environmental issues. Furthermore, we determine whether and how family involvement can motivate firms to develop technologies for environmental performance. To illuminate this relation, we utilized a socioemotional wealth perspective, which provides useful insights into how family-controlled firms behave differently in comparison to non-family firms. Building on this socioemotional wealth approach, we suggest that family involvement helps firms engage in environmental innovation. In this study, we also explore how the positive link between family involvement and environmental innovation is dependent on family interlocks&mdash;the circumstance wherein a firm&rsquo;s family directors are affiliated with the boards of directors of other firms. Specifically, we suggest that an increase in a firm&rsquo;s family interlocks would strengthen the positive relationship between family involvement and environmental innovation. To test our ideas, we used a sample of 623 US public firms ranging from 1996 to 2010, which yielded 5047 firm-year observations. We find that family involvement facilitates the environmental innovation of firms. We also find that family interlocks intensify the positive effect of family involvement on environmental innovation. Finally, we discuss the theoretical and empirical implications of our results

How Does Family Involvement Affect Environmental Innovation? A Socioemotional Wealth Perspective

The purpose of this study was to examine how family involvement affects the environmental innovation of firms. While prior studies have shown that family involvement can enhance environmental performance, these environmental performances have been portrayed as firm activities to prevent environmental issues, such as air pollution, CO2 emissions, etc. We maintain that environmental performance should be more proactive and enable firms to transform their activities more fundamentally towards environmental protection. In this sense, we consider environmental innovation, i.e., technological development to address environmental issues, as a proactive measure enacting firm activities to address environmental issues. Furthermore, we determine whether and how family involvement can motivate firms to develop technologies for environmental performance. To illuminate this relation, we utilized a socioemotional wealth perspective, which provides useful insights into how family-controlled firms behave differently in comparison to non-family firms. Building on this socioemotional wealth approach, we suggest that family involvement helps firms engage in environmental innovation. In this study, we also explore how the positive link between family involvement and environmental innovation is dependent on family interlocks—the circumstance wherein a firm’s family directors are affiliated with the boards of directors of other firms. Specifically, we suggest that an increase in a firm’s family interlocks would strengthen the positive relationship between family involvement and environmental innovation. To test our ideas, we used a sample of 623 US public firms ranging from 1996 to 2010, which yielded 5047 firm-year observations. We find that family involvement facilitates the environmental innovation of firms. We also find that family interlocks intensify the positive effect of family involvement on environmental innovation. Finally, we discuss the theoretical and empirical implications of our results