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산소도입 아크릴산 플라즈마 중합에 의한 폴리에스테르 직물의 표면개질
박준욱,김지현,Park, Joon-Wook,Kim, Ji-Hyun 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.9
For improvement of the hydrophilicity and dyeability, the plasma polymerization of acrylic acid onto polyester fabric was applied in an inductively coupled glow discharge system. During glow discharge, oxygen was added to increase the carboxyl and hydroxyl group of platoma polymerized acrylic acid (PP-AA). The surface characteristics of PP-AA/polyester fabric was investigated at various discharge power and pressure of oxygen. The chemical structure of PP-AA was similar to poly(acrylic acid). Owing to the excellent hydrophilicity of the PP-AA, the wettability of PP-AA/polyester fabric was improved. It was further improved if oxygen was introduced during the plasma polymerization. Dyeability of PP-At/polyester fabric with basic dye was improved due to the presence of the carboxyl group of PP-AA.
박준욱,선동일,조광재,조영훈,유화종,김민식 대한이비인후과학회 2010 Clinical and Experimental Otorhinolaryngology Vol.3 No.3
Objectives. The reported incidence of tongue cancer in young patients has recently increased. The aim of this study was to analyze the clinical characteristics of tongue cancer in a young group of patients, and to compare them with those of an older group of tongue cancer patients. Methods. We retrospectively reviewed the records of 85 patients who were diagnosed with squamous cell carcinoma of the tongue. They were divided into two age groups: over 45 years of age and under 45 years. To compare the prognosis of similarly staged patients in the group, each age group was divided into the early (stage I, II) and advanced stage groups (stage III, IV), and then they were compared. The young group consisted of 23 patients and the older group had 62 patients. Results. At the early stage, the clinical prognosis of the patients in both age groups was good, and no significant difference was observed. However, at the advanced stage, the overall and regional recurrence rates were significantly higher in the younger age group as compared to that in the old age group (P=0.007, P=0.001, respectively). The diseasespecific survival rate of the patients in the young group was significantly lower than that in the old age group (P=0.025). Conclusion. Tongue cancer in young subjects has significantly different clinical outcomes according to the stage. The clinical outcome of the advanced-stage tongue cancer in young subjects was poorer than that in the older subjects. Regional recurrence seemed to be the main cause of the poor prognosis.
박준욱,이성학,이희춘 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.5
A study was made of the effects of alloying elements on microstructural factors and wear properties of four high speed steel (HSS) rolls manufactured by centrifugal casting method. A simulation test was carried out using a high-temperature wear tester capable of controlling speed, load, and temperature. The test results revealed that the HSS roll containing a larger amount of vanadium showed the best wear resistance because it contained a number of hard MC carbides. However, it showed a very rough roll surface because of the cracking along cell boundaries, the preferential removal of the matrix, and the sticking of the rolled material to the roll during the wear process, thereby leading to increase in friction coefficient and rolling force. In order to improve wear resistance with consideration of the roll surface roughness, it is suggested that reduction in the vanadium content, solid solution hardening by adding alloying elements, secondary hardening by precipitation of fine carbides in the matrix, and formation of fine prior austenite grain boundaries by pre-austenitization treatment are required to strengthen the matrix which can hold hard carbides in it.
박준욱,박영민,정우진,신유섭,홍용태,최익준,김지원,우승훈,김연수,장재원,김민식,정광윤,안순현,김철호,홍기환,정필상,김영모,김세헌,백승국 대한이비인후과학회 2021 Clinical and Experimental Otorhinolaryngology Vol.14 No.2
Objectives. Head and neck squamous cell carcinomas (HNSCs) are frequently diagnosed at the locoregional advanced stage (stage IVa), but controversy remains regarding whether stage IVa HSNCs should be treated with upfront surgery or definitive chemoradiation therapy (CRT). The purpose of this study was to compare overall survival (OS) and disease-free survival (DFS) in patients with stage IVa HNSC treated primarily by surgery with curative intent with/without (neo)adjuvant treatment (surgery group) versus those treated primarily with CRT (CRT group). Methods. We reviewed data of 1,033 patients with stage IVa HNSC treated with curative intent at 17 cancer centers between 2010 and 2016. Results. Among 1,033 patients, 765 (74.1%) received upfront surgery and 268 (25.9%) received CRT. The 5-year OS and DFS rates were 64.4% and 62.0% in the surgery group and 49.5% and 45.4% in the CRT group, respectively. In multivariate analyses, OS and DFS were better in the surgery group than in the CRT group (odds ratio [OR] for death, 0.762; 95% confidence interval [CI], 0.592–0.981; OR for recurrence, 0.628; 95% CI, 0.492–0.802). In subgroup analyses, the OS and DFS of patients with oropharyngeal cancer were better in the surgery group (OR for death, 0.548; 95% CI, 0.341–0.879; OR for recurrence, 0.598; 95% CI, 0.377–0.948). In the surgery group, patients with laryngeal cancer showed better OS (OR for death, 0.432; 95% CI, 0.211–0.882), while those with hypopharyngeal cancer DFS was improved (OR for recurrence, 0.506; 95% CI, 0.328–0.780). Conclusion. A survival benefit from surgery may be achieved even in patients with stage IVa HNSC, particularly those with oropharyngeal and laryngeal cancer. Surgery led to a reduction in the recurrence rate in patients with hypopharyngeal cancer.