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Elliot K. Blau,Sarah A. Adelstein,Katherine A. Amin,Sharon J. Durfy,Alvaro Lucioni,Kathleen C. Kobashi,Una J. Lee 대한비뇨의학회 2020 Investigative and Clinical Urology Vol.61 No.-
Purpose: To identify demographic and clinical characteristics of patients with symptomatic pelvic floor mesh complications who underwent mesh removal at our academic medical center. The secondary goal was to determine patient-reported outcomes after mesh removal. Materials and Methods: We conducted a retrospective review of consecutive patients from 2011–2016 undergoing removal of mesh graft for treatment of symptomatic mesh-related complications. Patient demographics, comorbidities, symptoms, and mesh factors were evaluated. Outcomes after explant were determined by the Patient Global Impression of Improvement and a Likert satisfaction scale. Results: One hundred fifty-six symptomatic patients underwent complete or partial pelvic floor mesh removal during the study period. Mid-urethral slings comprised 86% of explanted mesh grafts. Mesh exposure or erosion was identified in 72% of patients. Eighty-one percent of patients presented with pain, and 35% reported pain in the absence of exposure or erosion. Pre-operative comorbidities included psychiatric disease (54.5%), chronic pain (34.0%), irritable bowel syndrome (20.5%) and fibromyalgia (9.6%). Forty-three percent of patients reported current or past tobacco use. At mean follow-up of 14 months, 68% of responding patients reported improvement on the Patient Global Impression of Improvement after surgery. Conclusions: This research identified tobacco use, and psychiatric, immunosuppressive, and chronic pain conditions as prevalent in this cohort of patients undergoing mesh removal. Surgical removal can improve presenting symptoms, including for patients with pain in the absence of other indications.
New anti-wear alloy development & Biomass-caused equipment wear issues & mitigation strategy
Kyungjun Lee,Peter Blau,Jeffrey A. Lacey,George R. Fenske,Jun Qu 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.5
Quasicrystals have been used in various applications to improve wear resistance as well as friction. It is known that quasicrystal (i-phase) content and microstructure in alloys have a decisive effect on the mechanical properties, tribological performance, and corrosion behavior. In this research, four (β+i)-dual-phased quasicrystal alloys with different i-phase content and grain size were developed to alleviate the brittleness of the i-phase with the help of the soft β-phase. The influences of the i-phase content and grain size were investigated through impact test, wear test, and corrosion analysis. Through the annealing process, the amount of the i-phase was increased by about 38% (59.24% → 81.75%), and, besides, the grain size of the i-phase was simultaneously increased from 3.47 ㎛ up to 9.98 ㎛. As the amount of i-phase increased, it was possible to increase the hardness from 712 HV to 763HV. Meanwhile, the increased grain size (i-phase) reduced the contact stress of the grain during wear testing; thus, the specific wear rate could be decreased from 2.21×10<sup>-4</sup>mm³/Nm to 0.5×10<sup>-4</sup>mm³/Nm. Not only that, but an experimental wear equation was obtained using empirical data to predict the wear behavior of the dual phased alloys. As the second topic, the cutting tools’ material and working conditions are one of the most critical factors that directly affect the economic efficiency of the biomass size reduction process. Various biomass and accompanying extrinsic inorganic compounds like sand particles cause severe wear on the cutting tools. The generated wear modes varied, such as abrasive, erosive, and impact wear. In particular, the degree of wear of the blade cutting edge determines the cutting efficiency. Thus, by investigating the worn blades, we revealed the wear mechanism and measured the cutting edge’s rounding radius. Based on the results, candidate materials were selected, and a two-body and three-body abrasion test (ORNL) was conducted to compare and evaluate with the conventional blade. This study will provide a great indicator of the wear mechanism analysis and the material selection for diverse biomass comminution equipment.
Oh, In‐,Sue,Blau, Gary,Han, Joo Hun,Kim, Seongsu Wiley Periodicals, Inc. 2017 Human Resource Management Vol.56 No.2
<P><B>Abstract</B></P><P>Human resource (HR) managers’ commitment to their occupation (HR) leads to the proper delivery and implementation of HR practices and, therefore, is deemed as a critical factor for the success of HR practices. Based on sociocognitive, human capital, and signaling theories, this study examines: (a) HR managers’ own and their chief HR officer's (CHRO) HR‐specific human capital as antecedents of their commitment to HR, and (b) the mediating mechanism through which the CHRO’s HR‐specific human capital positively influences HR managers’ commitment to HR. Based on 146 HR managers from 146 organizations in South Korea, the findings of the current study suggest that HR managers with higher levels of HR‐specific human capital and those working with CHROs with higher levels of HR‐specific human capital tend to have higher levels of commitment to HR. In addition, CHROs with higher levels of HR‐specific human capital positively influence HR managers’ commitment to HR by signaling to them that HR and its function are valued and cared about by their organizations. Theoretical and practical implications of this study are discussed along with study limitations and further research directions. © 2015 Wiley Periodicals, Inc.</P>
Wavelength-selective switch with direct few mode fiber integration.
Marom, D M,Dunayevsky, J,Sinefeld, D,Blau, M,Ryf, R,Fontaine, N K,Montoliu, M,Randel, S,Liu, C,Ercan, B,Esmaeelpour, M,Chandrasekhar, S,Gnauck, A H,Leon-Saval, S G,Bland-Hawthorn, J,Salazar-Gil, J R,S Optical Society of America 2015 Optics express Vol.23 No.5
<P>The first realization of a wavelength-selective switch (WSS) with direct integration of few mode fibers (FMF) is fully described. The free-space optics FMF-WSS dynamically steers spectral information-bearing beams containing three spatial modes from an input port to one of nine output ports using a phase spatial light modulator. Sources of mode dependent losses (MDL) are identified, analytically analyzed and experimentally confirmed on account of different modal sensitivities to fiber coupling in imperfect imaging and at spectral channel edges due to mode clipping. These performance impacting effects can be reduced by adhering to provided design guidelines, which scale in support of higher spatial mode counts. The effect on data transmission of cascaded passband filtering and MDL build-up is experimentally investigated in detail.</P>