大邱大学

Engineered hydrophobic–hydrophilic regions tune catalyst wettability to control the triple-phase boundary, promoting N 2 adsorption while limiting proton transport. This enhances NRR selectivity and suppresses competing HER.

BACKGROUND:While bariatric surgery (BS) is an effective treatment for gout in patients with morbid obesity, little is known about how BS influences subsequent use of gout medications. We investigated the impact of BS on gout medication use. METHODS:This retrospective nationwide cohort study used data from South Korea, including all patients who underwent BS in 2019-2020. A control group was created using propensity score matching. The primary outcome was the change in the proportion of patients using gout medications, categorized as urate-lowering therapy (ULT) or acute medications. We assessed hazard ratios for discontinuation and reinitiation of medications after BS using Cox regression. RESULTS:The study included 3804 participants in the BS group and 15,240 propensity score-matched controls. Over the 3 years after surgery, ULT use in the BS group declined to rates comparable to those in controls from month 13 onward, and discontinuation was more likely in the BS cohort (adjusted hazard ratio, 1.80; 95% confidence interval, 1.37-2.37). In contrast, although acute medication use also decreased after BS, its rate remained higher than in controls, and discontinuation did not differ significantly. Similarly, the 3-year rate of gout medication reinitiation did not differ significantly between groups. CONCLUSIONS:Over 3 years after BS, overall gout medication use in the BS group declined to a level comparable to that in controls, with a significantly higher ULT discontinuation rate. Discontinuation of acute gout medications did not differ significantly.

This study investigates a novel nondestructive testing (NDT) method for evaluating the compressive strength of concrete by analyzing impact force response signals. The objective of this research is to determine whether a parameter derived from these signals-total impact force signal energy (TIFSE)-can serve as a reliable and quantifiable indicator of uniaxial compressive strength. Motivated by the limitations of existing NDT methods, such as the rebound hardness test and the ultrasonic pulse velocity test, this study introduces TIFSE, which is defined as the time integral of the squared impact force measured during both the initial and subsequent rebound impacts. This formulation reflects the energy attenuation behavior of the material, which is inherently linked to its mechanical strength. To validate this approach, experiments were conducted on concrete specimens with different sizes and mix designs, as well as six on-site field model structures. The results demonstrated a strong, direct, and consistent correlation between TIFSE and measured compressive strength across all conditions tested. These findings indicate that TIFSE provides a reliable, practical, and noninvasive method for assessing concrete compressive strength in both laboratory and field conditions.

Although health literacy is critical for determining the quality and outcomes of healthcare, research on the health literacy competencies (HLCs) of healthcare professionals tasked with identifying and educating vulnerable populations remains limited. This study aimed to validate and refine a previously developed HLCs instrument for use among healthcare professionals in Korea. The original instrument was based on the conceptualization of HLCs, and included four domains: knowledge, attitudes, skills, and practices. Following translating and back-translating, a three-round Delphi survey was conducted with 20 health literacy experts from diverse fields between October 2022 and September 2023. The experts rated each item on a four-point Likert scale to compute the content validity index (CVI) and content validity ratio (CVR), and provided written feedback and recommendations, retaining 61 items for field testing. After expert panel review, a web-based survey was administered from October to December 2023 to physicians, registered nurses, pharmacists, and dietitians with ≥ 6 months of experience and routine direct patient contact. Of the 391 respondents, 359 were included in the final analysis. Validity and reliability were assessed using confirmatory factor analysis (CFA), Cronbach’s alpha, and test–retest reliability. Most participants were female (79.7

PurposeThis study examines the self-regulatory mechanisms underlying servant leadership. Grounded in the resource allocation perspective (Kanfer et al., 1994) and the cognitive appraisal theory of emotions (Lazarus, 1991), we propose that goal orientation influences servant leadership through its impact on affect spin, a measure of intraindividual affect variability.Design/methodology/approachThe study employs a matched-sample design involving 89 supervisors and 259 subordinates. Supervisors reported their goal orientation and daily affect states using the Day Reconstruction Method (Kahneman et al., 2004) over three non-consecutive days, while subordinates provided ratings of their supervisors' servant leadership.FindingsResults indicate that learning goal orientation (LGO) is positively associated with servant leadership. Furthermore, affect spin mediates this relationship, suggesting that leaders with higher LGO experience have lower affect spin, thereby conserving self-regulatory resources necessary to sustain servant behaviors. In contrast, both performance-prove and performance-avoid goal orientations exhibited only marginal or nonsignificant relationships with affect spin and servant leadership.Originality/valueThis study contributes to the servant leadership literature by shifting the focus from static individual characteristics to dynamic self-regulatory processes. In doing so, it provides a more nuanced understanding of how servant leadership emerges and is sustained over time.