5,039 research outputs found
Job satisfaction stability increases over time: meta-analysis and fifteen-year longitudinal study
No full textI investigate the stability of job satisfaction under the hypothesis that stability increases with employee age and work experience. This idea is tested via both meta-analytic evidence and a 15-year longitudinal data set with four waves of observation. The target phenomenon—i.e., the increase in job satisfaction stability across time—is specified as a moderator effect of age or tenure on the relationship between job satisfaction at time t and job satisfaction at time t + 1. Results indicate that job satisfaction stability increases with age and tenure at both the between-persons and within-persons levels of analysis. At the between-persons level of analysis, rank-order correlations for job satisfaction increase with age and job tenure in linear and nonlinear patterns, based on meta-analysis (Study 1). At the within-persons level of analysis, results suggest that the intra-individual lagged effect of early job satisfaction on later job satisfaction also increases with age and tenure (Study 2). I further show additional moderators of job satisfaction stability, including time lag, job change, and organization change.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01The student, Gahyun Jeon, accepted the attached license on 2015-03-24 at 19:45.The student, Gahyun Jeon, submitted this Dissertation for approval on 2015-03-25 at 13:09.This Dissertation was approved for publication on 2015-03-26 at 08:31.DSpace SAF Submission Ingestion Package generated from Vireo submission #7769 on 2015-07-22 at 14:24:13Made available in DSpace on 2015-07-22T22:45:08Z (GMT). No. of bitstreams: 2
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Previous issue date: 2015-03-26Embargo set by: Seth Robbins for item 79960
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The Effect of Intraoperative Nefopam Administration on Acute Postoperative Pain and Chronic Discomfort After Robotic or Endoscopic Assisted Thyroidectomy: A Randomized Clinical Trial
No full textAcute postoperative pain and chronic discomfort are reported after robotic or endoscopic thyroidectomy. The purpose of this prospective, randomized, and double-blinded clinical trial was to investigate whether intraoperative infusion of nefopam decreases acute postoperative pain and chronic discomfort following either a robotic or endoscopic thyroidectomy via the bilateral axillo-breast approach (BABA). Patients were randomized into two groups: The control group (n = 29) or the nefopam group (n = 29). Patients in each group were infused with the same volume of saline or nefopam (0.2 mg/kg bolus, 120 mu g/kg/h continuous infusion) during surgery. Acute postoperative pain, the need for rescue analgesics, and other postoperative adverse effects were assessed at 1, 6, 24, and 48 h postoperatively. Chronic pain and discomfort was recorded at 3 months after surgery. Patients in the nefopam group reported lower pain scores in the neck, as well as the axilla and anterior chest areas at 1, 6, 24, and 48 h postoperatively, when compared with the control group (P < 0.05 at each time points). Rescue analgesics were required less in the nefopam group than in the control group (1.4 [1] vs. 2.3 [1.5]; P = 0.001). The degree of chronic pain and discomfort were relatively lower in the nefopam group (P < 0.05). We report that intravenous nefopam infusion during surgery decreased acute postoperative pain and the need for rescue analgesics, as well as chronic discomfort, following BABA robotic or endoscopic thyroidectomy without adverse events.OAIID:RECH_ACHV_DSTSH_NO:T201830465RECH_ACHV_FG:RR00200001ADJUST_YN:EMP_ID:A078159CITE_RATE:2.766DEPT_NM:의학과EMAIL:[email protected]_YN:YN
Initial formation mechanisms of (Ga(1-x)Mn(x))N nanorods grown on Al(2)O(3) (0001) substrates
No full textThe (Ga(1-x)Mn(x))N nanorods were grown oil Al(2)O(3) (0001) substrates by using rf-associated molecular beam epitaxy. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and selected-area diffraction pattern (SADP) results showed that the (Ga(1-x)Mn(x))N nanorods had (0001) preferential orientations. XRD patterns showed that the (Ga(1-x)Mn(x))N nanorods contained a small number of grains with different preferred orientations. High-resolution TEM (HRTEM) images showed that the (Ga(1-x)Mn(x))N nanorods consisted of different preferentially oriented grains. The initial formation mechanisms for the (Ga(1-x)Mn(x))N nanorods grown on Al(2)O(3) (0001) substrates are described on the basis of the XRD, the TEM, the SADP, and the HRTEM results
CROSS TALK BETWEEN BENDING, TWISTING, AND BUCKLING MODES OF THREE TYPES OF MICROCANTILEVER SENSORS
No full textMicrocantilevers generally deflect in three ways: bending, twisting, and buckling. Among these, the accurate measurement of bending is essential for atomic force microscopy imaging and sensing applications. However, it was found that the bending of certain cantilevers can be coupled with twisting and buckling of the cantilever. In this article, cross talk between bending and twisting modes of microcantilevers of three different designs such as rectangular, triangular, and piezoresistive cantilevers is described. For the experiments, a thermal stress was applied to the rectangular and triangular cantilevers, and a Lorentz force was exerted on the triangular and the piezoresistive cantilevers. While the bending of the rectangular cantilever induced a negligible amount of twisting when heated, the triangular cantilevers showed nonlinear twisting responses during bending. This nonlinear response of the triangular cantilever was attributed to the variations in the spring constants between the two legs. When a Lorentz force was exerted on the triangular cantilevers, coupling of the bending and twisting modes depended on the direction of a magnetic field. For the piezoresistive cantilevers, a Lorentz force induced the in-phase buckling which accompanied both the bending and twisting modes. (C) 2004 American Institute of Physics.open111213sciescopu
Effect of normal vibration on friction in the atomic force microscopy experiment
No full textWe studied the effect of periodic normal (out-of-plane) surface vibrations on friction in an atomic force microscope experiment. Vibration frequency was varied in the range of 1-100 kHz, and vibration amplitude was varied in the range of a few nanometers. We observed a reduction of a few orders of magnitude in friction coefficient due to the periodic vibrations. Friction reduction is over a wide range of vibration frequencies and amplitudes. Very low values (of the order of 0.01) of friction coefficient were measured. Our numerical simulation based on a minimalist modeling qualitatively agrees with the experimental results. Based on numerical simulations, a mechanism of friction reduction and/or increase with normal vibrations is proposed. (c) 2006 American Institute of Physics.open112628sciescopu
TORSIONAL SPRING CONSTANT OBTAINED FOR AN ATOMIC FORCE MICROSCOPE CANTILEVER
No full textIn this letter, a method to measure the torsional spring constant of a microcantilever is described. The cantilever was twisted laterally without any normal load by inducing the Lorentz force. An electrical current was applied to the cantilever in a magnetic field, and the torsional resonance frequency of the cantilever was obtained. Based on the observation that the torsional resonance frequency is the same as the second resonance peak of the thermally vibrating cantilever, the ratio of deflection spring constant to torsional spring constant is easily obtained from a simple relationship. For the cantilever used here, the torsional spring constant is 11.24 N/m, 28 times greater than the deflection spring constant. (C) 2004 American Institute of Physics.open1122sciescopu
Electrochemical properties of ceria-based intermediate temperature solid oxide fuel cell using microwave heat-treated La0.1Sr0.9Co0.8Fe0.2O3-delta as a cathode
No full textThe temperature dependence of the chemical diffusion coefficient and the surface exchange coefficient of LSCF1982 is successfully determined from the D.C. conductivity relaxation in the temperature range of 500 <= T/degrees C <= 700 and an oxygen partial pressure of 0.21 atm. The kinetic values of chemical diffusion coefficient (D) and surface exchange coefficient (k) are 1.85 x 10(-5) cm(2) s(-1) and 2.42 x 10(-4) cm s(-1) at 650 degrees C, respectively. The electrochemical properties of La0.1Sr0.9Co0.8Fe0.2O3-delta (LSCF1982) as a cathode for ceria based IT-SOFC are successfully characterized by I-V performance measurement and electrochemical impedance spectroscopy (EIS) in terms of cathode microstructure effects by using microwave heat treatment. The cell with microwave heat-treated cathode shows the higher performance than conventional heat treated cathode. At 650 degrees C the open circuit potential (OCP) and maximum power density are respectively 0.753 V and 1.79 W cm(-2) under 150 sccm of wet hydrogen and air gas flow conditions, and the ohmic and electrode area specific resistance (ASR) are 0.037 and 0.014 Omega cm(2), respectively. (C) 2012 Elsevier B.V. All rights reserved.
Clinicopathologic and Genetic Features of Primary T-cell Lymphomas of the Central Nervous System
No full textPrimary central nervous system lymphoma (PCNSL) of peripheral T-cell lineage (T-PCNSL) is rare, and its genetic and clinicopathologic features remain unclear. Here, we present 11 cases of T-PCNSL in immunocompetent individuals from a single institute, focusing on their genetic alterations. Seven cases were subject to targeted panel sequencing covering 120 lymphoma-related genes. Nine of the eleven cases were classified as peripheral T-cell lymphoma, not otherwise specified (PTCL-NOS), of which one was of gamma delta T-cell lineage. There was one case of anaplastic lymphoma kinase-positive anaplastic large cell lymphoma and another of extranodal natural killer (NK)/T-cell lymphoma (ENKTL) of alpha beta T-cell lineage. The male to female ratio was 7 : 4 and the age ranged from 3 to 75 years (median, 61 y). Most patients presented with neurological deficits (n=10) and showed multifocal lesions (n=9) and deep brain structure involvement (n=9). Tumor cells were mostly small-to-medium, and T-cell monoclonality was detected in all nine evaluated cases. PTCL-NOS was CD4-positive (n=4), CD8-positive (n=3), mixed CD4-positive and CD8-positive (n=1), or CD4/CD8-double-negative (n=1, gamma delta T-cell type). Cytotoxic molecule expression was observed in 4 (67%) of the 6 evaluated cases. Pathogenic alterations were found in 4 patients: one PTCL-NOS case had a frameshift mutation in KMT2C, another PTCL-NOS case harbored a truncating mutation in TET2, and another (gamma delta T-cell-PTCL-NOS) harbored NRAS G12S and JAK3 M511I mutations, and homozygous deletions of CDKN2A and CDKN2B. The ENKTL (alpha beta T-cell lineage) case harbored mutations in genes ARID1B, FAS, TP53, BCOR, KMT2C, POT1, and PRDM1. In conclusion, most of the T-PCNSL were PTCL-NOS, but sporadic cases of other subtypes including gamma delta T-cell lymphoma, anaplastic lymphoma kinase-positive anaplastic large cell lymphoma, and ENKTL were also encountered. Immunophenotypic analysis, clonality test, and targeted gene sequencing along with clinicoradiologic evaluation, may be helpful for establishing the diagnosis of T-PCNSL. Moreover, this study demonstrates genetic alterations with potential diagnostic and therapeutic utility in T-PCNSL.Y
Dynamic push-pull operational amplifier for AMLCD common voltage driver using minimum current limiting circuit
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