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아크릴로니트릴과 스티렌계 광공중합 반응속도에 관한 연구
설수덕,최경선 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.1
The objective of this study is to investigate the kinetics of the photoinitiated(λ=365nm)copolymerization of acrylonitrile with styrene in the presence of Lewis acid and hydrogen donors-in and homogeneous reaction system at 25℃. From these experiment and discussions, we have the results as follows. 1. The reaction of AN-St successfully competes with the quenching of BP triplet by styrene. 2. The monomer reactivity ratio of AN-St was deterimined by Kelen-Tu¨do¨s method, reactivity ratios of n(AN), r₂(St), as 0.09, 0.59 respectively and their model is as follows. R_p=0.023[M]^0.48[I]^0.47[S]^0.62[H]^0.32exp^-1.38/RT
겔 투과 크로마토그라피법에 의한 페 메타크릴산메칠수지와 스티렌계열수지화합물의 열분해 메카니즘에 관한 연구
나상도,설수덕 동아대학교 환경문제연구소 1995 硏究報告 Vol.18 No.2
The mechanism of thermal degradation in blend of polymethyl methacrylate (PMIMA), styrene Copolymers such as (α-styrene-co-acrylonitrile) Copolymer(SAN), (acrylonitrile-butadiene-acrylonitri1e)terpolymer(ABS) were analyzed using the thermal analysis, gel permeation chromatography, pyrolysis gas chromatography and infra-red apectroscopy in the stream of nitrogen. · It has been shown that the depolymerization of blends were a radical chain reaction and that degradation in the region of 300-400 C is associated with initiation by scission of the polymer at random along its length to from radicals. · The dominant process in the degradation of PMMA-PS blend was main chain scission randomly due to weak link except PMMA-SAW and PMMA-ABS blend below 300 ℃ under nitrogen environment. · The aimplest depolymerization reaction is that of PMMA from which monomer is obtained 90% over is PS, SAN and ABS blends.
설수덕,왕석주,이내우 한국공업화학회 1998 응용화학 Vol.2 No.2
The thermal decomposition of low density polyethylene(LDPE) arts 25%∼48% chlorinated(CPE) were studied using a dynamic thermogravimetry in the stream of nitrogen gas with 20㎖/min. The mathmatic method, differential and Integral method were used to obtain value of activation by the above methods agree with each other very wall. The maximum average activation energy calculated was 78.1㎉/mol. The thermal decomposition of LDPE and CPE were considered to be carried out by main chain scission and the thermogravimetric trace curve agree with the theoretical equation.
설수덕,서영옥 한국공업화학회 1998 응용화학 Vol.2 No.2
We were investigated performance of pressure-sensitive acrylic adhesive that blending of acrylic adhensive by batch reactor. and we examinated viscosity, temperature, heat treatment rate and peel adhesion. when the peel adhension is 160 g_f/25㎜ we know that optimum blending ratio is 1.3:1 as acrylic adhensive/solvent, that is shown hightest generality. when viscosity range of adhensive is 1000∼2000cps, peel adhension of removal type adhensive show ahout 160g_f/25㎜. For non-volatility after drying is 30%, viscosity show the optimum property so that we know a room temperature curing adhensive. Pot life is 30 sec. as a heat treatment rate at 50m/min, therefore minimum curing time is 30 sec. Not only weathering resistance keep up peel adhension 160∼180g_f/25㎜ after 1,000hrs, but also no residual remains.
무수말레인산과 알킬메타크릴레이트의 공중합과 열분해 (2)
설수덕,서영옥,이동호,황준호,조철형 한국공업화학회 1998 응용화학 Vol.2 No.2
Due to the rising cost of energy, new separation processes based on extraction are becoming more attractive than before. Thus, the need for calculating and predicting liquid-liquid equilibria(LLE) has very much increased. The purpose of this study is to determine and to describe LLE data for the ternary or quaternary systems containing acetic acid aqueous solution at 25℃.
셀룰로오즈계 그라프트 공중합체에서 합성수지 함량결정과 물성에 관한 연구
설수덕,이동호 한국공업화학회 1998 응용화학 Vol.2 No.2
Thermal decomposition mechanism and kinectics of α-cellulose on Grafting of Acrylonitrile onto partially α-Cellulose were obtained using thermal analysis, pyrolysis gas chromatography and fourier transform-infrared spectrometer method under dynamic and isothermal condition in the stream of nitrogen. 1. the values of activation energy evaluated by Friedman's and Ozawa's method were consistent with each other very well. it was possible te determine the thermal stability of samples from these results. 2. the optimum thermal stabilization in Acrylonitrile-grafted α-cellulose was obtained in composition of 5∼10% AN.
설수덕,서영옥,최경선 한국공업화학회 1998 응용화학 Vol.2 No.2
Kinetics of solution photopolymerization of Acrylonitrile(AN) with inorganic salt for sensitizer such as, NaSCN, KSCN, Ba(SCN)₂, NH₄SCN, ZnCl₂, Na₂SeO₃ was studied using the UV crosslinker at various monomer concentration(1.8∼7.58 mol/1), salt concentration(10∼60%), reaction temperature(10∼70℃), energy intensity(1000∼9900 μ J/cm²) under isothermal condition in the stream of nitrogen. Under irradiation of high-pressure mercury lamp( λ =365nm) AN was polymerized to high conversion and uniform average molecular weight as compared thermal polymerization with the reaction temperature of 50℃, reaction time of 3hr and 50% NaSCN without any initiator.
신장 ; 혈액투석 환자에게서 Biohole(TM) 쐐기를 이용한 Buttonhole 천자법의 임상적 유용성
최수정 ( Soo Jeong Choi ),이설형 ( Seol Hyoung Lee ),조은희 ( Eun Hee Cho ),오혜란 ( Hye Ran Oh ),김은정 ( Eun Jung Kim ),박무용 ( Moo Yong Park ),김진국 ( Jin Kuk Kim ),황승덕 ( Seung Duk Hwang ) 대한내과학회 2012 대한내과학회지 Vol.82 No.3
Background/Aims: Buttonhole cannulation has been popular because it provides an easy puncture, is less painful, and requires less time for hemostasis. However, the technique requires a skilled staff and a long time to form the tract. A new buttonhole technique using Biohole(TM), which shortens the time needed for tract formation, has been introduced in Europe, North America, and Japan. Methods: We prepared a cannulation tract using the buttonhole technique and Biohole(TM) over a two-week period and compared the 12-week outcomes between patients who underwent the rope-ladder versus buttonhole techniques. Results: The 40 patients (27 males) had a mean age of 49.1±14.2 years. Thirteen and 27 patients were cannulated with the rope-ladder and buttonhole techniques, respectively. Patients who underwent the buttonhole technique had more initial pain than did those who received the rope-ladder technique (p=0.044). The Biohole(TM) procedure improved puncture pain (5.6 vs. 3.4, p=0.003) and shortened hemostasis time (1.8 vs. 1.3, p=0.001). Over a two-week period, patients using Biohole(TM) experienced dislocation (20.8%), bleeding at peg sites (8.6%), and pain during peg change (2.4%). Over the 12 week study period, patients who underwent the buttonhole technique had insignificantly less pain than did those who received the rope-ladder technique (p=0.088), but the former had less bleeding time than the latter (p=0.000). One patient who received the buttonhole technique experienced one episode of infection (p=0.327). Conclusions: The new buttonhole technique using Biohole(TM) is safe and useful in the short term. A long-term, larger, multicenter study is required to confirm these results. (Korean J Med 2012;82:307-312)
Prevalence of endoparasite infection on stray dogs in Chungbuk province
( Kyung Duk Min ),( Dang Young Kim ),( Bong Su Kang ),( Ja Seon Yoon ),( Ja Kyung Seol ),( Ji Young Yoon ),( Jae Hwang Jeong ),( Sang Yoon Nam ),( Young Won Yun ),( Jong Soo Kim ),( Beom Jun Lee ) 한국예방수의학회(구 한국수의공중보건학회) 2013 예방수의학회지 Vol.37 No.1
As the companion animal industry has shown rapid development in Korea, the number of stray animals has increased. This phenomenon has become a social issue in terms of animal welfare, as well as public health-related problems. However, the authoriries have difficulty in coping with the problems, because the number of research studies on stray animals is insufficient. In this study, 49 feces of stray dogs were examined in three animal shelters located in Chung-buk province, in order to establish baseline data for parasite distributions on stray dogs. The zinc-sulfate flotation and formalin-ether sedimentation methods were used for parasite isolation. The examined dogs consisted of 26 males and 23 females, and they were categorized as three groups, including puppies (<1y), juveniles (1~3y), and adults (>3y). On microscopic examination, 28 feces were considered as infected (57.14%). The isolated parasite eggs were composed of 11 different species. The most frequent species was Ancylostoma caninum (28.57%), followed by lsospora canis (24.49%), Trichuris vulpis (10.20%), Toxocara leonina (6.12%), etc. The older dogs had a higher prevalence rate however, no significant relevance were observed between sex and prevalence. All cases of Toxocara leonina infection (n=3) belonged to the male group, and all cases of Trichuris vulpis infection (n=5) belonged to the juvenile group. Infection of A. caninum and 1. canis were identified as the most frequent case of co-infection. A. caninum and 1.canis were the parasites showing the greatest infestation in Chungbuk. In addition, as zoonotic parasites were identified, a proper surveillance system should be required.