799 research outputs found

    Application of FLACS to develop a standard for explosion venting of empty vessels

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    Master's thesis in Offshore technologyExplosion venting is the most commonly used method to mitigate consequences of gas explosions. Therefore, research has been ongoing to establish adequate venting criteria for gas explosion. The existing standards are based on analytical models and empirical correlations. However, there are conflicts between the recommendations because of different factors influencing the peak overpressure that have been considered into such criteria or not. Therefore, in this thesis work, a modified recommendation of venting criteria in gas explosion was proposed under assumption that one of the factors giving significant impact on overpressure was controlled. To obtain a wide range of data to support the proposed modification, various cases of vented gas explosions were simulated by using a CFD tool, FLACS. Furthermore, turbulence generation at equipment inside the enclosure and acoustic resonance were not taken into consideration to meet the assumption. Accordingly, FLACS which does not take into account the effect of acoustic resonance was used as the main tool to run the vented gas explosion simulations. The proposed recommendation based on acquired results from FLACS simulations is less conservative than the existing recommendation suggested by Bradley & Mitcheson [1978], which has made reference to the aforementioned factors. Hence, it is expected that this work might help develop a guideline for explosion venting by proposing a modified safe recommendation in vent areas. However, the guideline shall specify that proper measures have to be implemented to eliminate the factors mentioned above

    Persuasive Impact Of Fit Between Regulatory Focus And Message Framing On Consumer Responses: Message Strength And Choice For Others

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    Previous research on message framing has argued that fit between message framing and consumer regulatory focus influences consumer response. That is, positive frames are more persuasive for promotion-focused individuals, while negative frames are more persuasive for prevention-focused individuals. This research aims to expand the scope of previous research on message framing and argues that the match-up effect between message framing and regulatory focus, an effect established in previous research, is dependent on the strength of the message. This research further argues that the match-up effect patterns between message framing and regulatory focus differ based on whether or not consumers are making a purchase for themselves or for others. Specifically, this research hypothesizes that prevention-focused individuals tend to focus on uncertainty or risks related to choice for others and exhibit low levels of purchase intention regardless of message framing under the condition of making a purchase for others. This research also proposes that promotion-focused individuals tend to focus more on potential positive outcomes rather than negative risks when making a choice for others, resulting in a higher purchase intention regardless of message framing. That is, under the condition of making a purchase for others, the match-up effect of message framing and regulatory focus is rendered void. This research expands the scope of existing research on message framing and provides practical implications for marketing practitioners

    Recommendations for Interpreter Training for Asylum Interview Settings: The South Korean Case

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    The growing number of asylum applications submitted in South Korea and the recent passage of the Refugee Act (2013) call for a system for the provision of professional interpreting service and the training of interpreters for the asylum process. Although a few ad hoc training initiatives have been implemented in recent years, there is currently no training course that fulfills the requirements of the Act. This article thus aims to propose an appropriate training program for the certification of interpreters to be engaged in asylum interviews. To ensure the effectiveness of the training, the proposed training framework begins with prescreening of training candidates based on an examination of their bilingual and basic interpreting skills. In order to accommodate the specific conditions of South Korea, under which it is difficult to find candidates proficient in Korean among rare-language speakers, a separate track of intensive Korean-language training for speakers of in-demand rare languages was appended as a preparatory course to precede the main body of the training, so that those who lack Korean proficiency have training opportunities to improve their language skills prior to interpreter training. The main training program is focused on the development of interpreting skills through autonomous learning

    Self-consistent predictions for LIER-like emission lines from post-AGB stars

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    Early type galaxies (ETGs) frequently show emission from warm ionized gas. These Low Ionization Emission Regions (LIERs) were originally attributed to a central, low-luminosity active galactic nuclei. However, the recent discovery of spatially-extended LIER emission suggests ionization by both a central source and an extended component that follows a stellar-like radial distribution. For passively-evolving galaxies with old stellar populations, hot post-Asymptotic Giant Branch (AGB) stars are the only viable extended source of ionizing photons. In this work, we present the first prediction of LIER-like emission from post-AGB stars that is based on fully self-consistent stellar evolution and photoionization models. We show that models where post-AGB stars are the dominant source of ionizing photons reproduce the nebular emission signatures observed in ETGs, including LIER-like emission line ratios in standard optical diagnostic diagrams and Hα\alpha equivalent widths of order 0.1-3 angstroms. We test the sensitivity of LIER-like emission to the details of post-AGB models, including the mass loss efficiency and convective mixing efficiency, and show that line strengths are relatively insensitive to post-AGB timescale variations. Finally, we examine the UV-optical colors of the models and the stellar populations responsible for the UV-excess observed in some ETGs. We find that allowing as little as 3% of the HB population to be uniformly distributed to very hot temperatures (30,000 K) produces realistic UV colors for old, quiescent ETGs.Comment: ApJ accepted. 20 pages, 8 figure

    A Review of the Korean Cultural Syndrome Hwa-Byung: Suggestions for Theory and Intervention

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    The purpose of this paper is to review Hwa-Byung, a cultural syndrome specific to Koreans and Korean immigrants. Hwa-Byung is a unique diagnosis and differs from other DSM disorders. However, Hwa-Byung has frequent comorbidity with other DSM disorders such as anger disorders, generalized anxiety disorder, and major depressive disorder. There are several risk factors for Hwa-Byung including psychosocial stress caused by marital conflicts and conflicts with their in-laws. Previous interventions of the Hwa-Byung syndrome were based primarily on the medical model. Therefore, based on previous research, we present a new ecological model of Hwa-Byung. We also recommend some areas of future research as well as present some limitations of our ecological model. Finally, we discuss some treatment issues, particularly for Korean women in the United States