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Articles by Y. Lee
Total Records ( 3 ) for Y. Lee
  M. N. Munshi , M. Hayes , I. Iwata , Y. Lee and K. Weinger
  Aims  To examine whether different aspects of executive function as measured by different assessment tools are associated with glycaemic control and other clinical characteristics in older adults with Type 2 diabetes.

Methods  We performed a cross-sectional study of older adults aged ≥ 70 years with Type 2 diabetes at a tertiary care diabetes centre. The Dysexecutive Questionnaire was used to measure self-reported executive dysfunction. Objective tests of executive functions included a modified clock drawing test (Clock-in-a-Box), Trail Making Tests (parts A and B) and verbal fluency. Demographic and clinical information was collected using questionnaires and surveys. Glycaemic control was measured by HbA1c.

Results  We evaluated 145 patients [average age 77 ± 5 years, diabetes duration 15 ± 11 years, mean HbA1c 56 ± 11 mmol/mol (7.3 ± 1.1%)]. Poor performances on objective tests (low scores on Clock-in-a-Box and verbal fluency; and high scores on Trail Making Tests A and B) but not on the subjective test (the Dysexecutive Questionnaire), were associated with poor glycaemic control (r = −0.23, P < 0.005; r = −0.17, P < 0.04; r = 0.20, P < 0.01, r = 0.22, P < 0.008, r = −0.07, P < 0.42, respectively). In a multiple regression model (r2 = 0.39), high Dysexecutive Questionnaire scores were associated with higher diabetes-related distress (P < 0.0004), depressive symptoms (P < 0.004), number of falls (P < 0.009), fear of falling (P < 0.01), less years of education (P < 0.0007) and fewer medications (P < 0.001).

Conclusions  On the one hand, in older adults, executive dysfunction detected by objective tests is associated with poor glycaemic control and may be considered before prescribing complex treatment regimens. On the other hand, self-reported executive dysfunction is associated with risk and fear of falls, and more affective symptoms, which may indicate higher awareness of subtle deficits.

  M.S. Cho , S.Y. Kim , J.D. Nam and Y. Lee
  Poly(3,4-ethylenedioxythiophene)/copper (PEDOT/Cu) composites were prepared by an in situ redox reaction of 3,4-ethylenedioxythiophene (EDOT) and copper(II) chloride. During the reaction, EDOT was oxidatively polymerized by Cu(II) chloride, while the Cu(II) ions were reduced to produce Cu metal particles. PEDOT/Cu composite films were also successfully prepared on CuCl2-coated poly(ethylene terephthalate) (PET) films by the vapor phase polymerization of EDOT. PEDOT/Cu films were characterized using UV–vis spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) to confirm the formation of PEDOT, and the presence of metallic Cu particles.
  M.S. Cho , Y.Y. Yun , J.D. Nam , Y. Son and Y. Lee
  Poly(3,4-ethylenedioxythiophene) (PEDOT) films were synthesized by electropolymerization under an applied magnetic field on ITO glass. The effects of the magnetic field on the electrochemical polymerization of EDOT and the redox behavior were examined. The cyclic voltammetry (CV) result indicated that the applied magnetic field exceedingly accelerated the polymerization rate. The effect of the conformation of the PEDOT chains under applied magnetic field was studied by Raman spectroscopy. Scanning electron microscopy (SEM) showed the morphological changes of PEDOT film in the presence of the magnetic field. The parallel applied magnetic field induced the formation of more expanded chain structure as well as sharp crystalline morphology.
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