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이희승,황승상,최승석,백경열,이응찬,홍순만,이종찬 한국고분자학회 2012 Macromolecular Research Vol.20 No.11
A series of high molecular weight polymethylsilsesquioxanes (PMSQs) were synthesized through polymerization of an isolated hydroxyl-substituted cyclic siloxane stereoisomer, cis-trans-cis 1,3,5,7 tetramethyl 1,3,5,7tetrahydroxyl cyclosiloxane, for interlayer dielectric (ILD) application as low dielectric materials. The molecular weights of PMSQs were controlled by varying polycondensation time. Structural analyses of the obtained PMSQs were carried out by gel chromatography (GPC), FTIR, 29Si NMR, static light scattering (SLS), solution X-ray scattering,and X-ray diffraction. The change in molecular shape of the PMSQs went from linear to branched in structure as molecular weight increased. Furthermore, thin film properties were investigated for application as interlayer dielectric materials. As structural branching increased, its properties showed isotropic tendencies, relatively high modulus (5.4 GPa), and low dielectric constant (2.74) with increase in the inter-molecular space.
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이희승 대한의사협회 2012 대한의사협회지 Vol.55 No.10
Obesity, that is, having a body mass index (BMI) >30 kg/m2, has increased dramatically and became the most single most common preventable cause of death in South Korea. In the end, obesity results in metabolic syndrome, which includes abdominal obesity, increased triglycerides,decreased high-density lipoprotein, hypertension, and impaired glucose tolerance. Nonsurgical methods for obesity treatments include dietary therapy, exercise counseling, behavioral therapy, psychiatric therapy, and pharmacotherapy. Surgical methods for obesity treatments,laparoscopic gastric banding and Roux-en-Y gastric bypass, are commonly performed for obese patients, particularly those with a BMI of 40 kg/m2 or at BMI more than 30 kg/m2 with accompanying diseases related to metabolic syndrome such as hypertension, type 2 diabetes,hypercholesterolemia, asthma, angina, other cardiopulmonary diseases, infertility, polycystic ovary, urinary incontinence, severe arthritis, or Pickwickian syndrome. Preoperative evaluation for bariatric surgery should focus on airway management, sleep apnea history, use of a continuous positive airway pressure device, and comorbid systemic diseases. Special consideration and pharmacokinetic knowledge is needed for the choice and dose of the anesthetic agents as well as postoperative pain control, patient monitoring, fluid intake, and surgical complications. Obesity is a disease. Appropriate surgical intervention and peri-operative anesthetic care for bariatric surgery will increase the safety and satisfaction of obese patients and will finally provide a better quality of life for our society.
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