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Lee, Sang-Mook,Lee, Young-Joo,Lee, Jae-Wook The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.1
This study investigated the effect of ultrasound irradiation on the blend of poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT). The blends of PLA/PBAT(50/50) (PBAT50) were prepared in a melt mixer with an ultrasonic device attached. Thermal, rheological, and mechanical properties, morphology, and biodegradability of the sonicated blends were analysed. The viscosity of the sonicated blends was increased by the ultrasound irradiation owing to the strong interaction. The morphology of the sonicated blends was significantly dependent on the duration o the ultrasound irradiation. For PBAT50, the phase size reduction was maximized when the blends were ultrasonically irradiated for 30 sec. At longer duration of ultrasound irradiation, the PBAT phase underwent flocculation. Measurement of the tensile properties showed an increased breakage tensile stress and an enhanced Young's modulus when the blends were properly irradiated. This improvement was ascribed to better adhesion between the PLA matrix and the PBAT domain and to better dispersion of the PBAT phase. However, the tensile properties were maximized after excessive energy irradiation, which was ascribed to an emulsifying effect leading to coalescence of the PBAT phase. Impact strength was increased to reach a peak with the ultrasound irradiation, and was higher than the untreated sample for all sonicated samples due to the difference of failure mechanism between the tensile test and the impact test.
웹 어플리케이션 서버 기반의 인트라넷 시스템 설계 및 구현
이형묵,윤영미 京畿專門大學 1999 京畿專門大學 論文集 Vol.- No.27
Internet has been applied to information technology business and extends to the whole industrial world. As the most effective way of information propagation in an organization, implementing an intranet system makes a distinctive progress and various implementation methodology has been introduced. Our study proposed a solution for the intranet system commanding an university administrial and educational tasks making a comparison and an analysis among various intranet system implementation technologies, identified business requirements processes, implemented the intranet system based on this framework, and applied the system to our college.
위암 환자의 복강내 투여를 위한 Activated Charcoal-Alginate Bead 제형으로부터 Mitomycin C의 용출 거동
이진호,최선웅,서중기,김동민,정경수,오정연,김진향,노승무,민병무,김용백,김창식,박근성,강대영,송규상,양준묵,조준식,정현용,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
Locoregional recurrence is the most common type of recurrence in surgical operation of gastric adenocarcinoma, and peritoneal dissemination is one of the most difficult problems in advanced gastric adenocarcinoma treatment. Because the peritoneal cavity is the most common site of the first recurrence after gastric cancer resection, intraperitoneal chemotherapy seems a logical choice for cancer chemotherapy. In this study, Mitomycin C (MMC)-activated charcoal (CH)-alginate (ALG) beads were prepared by the mixtures of CH particles adsorbed with MMC as an anti-cancer drug and aqueous alginate solution. The alginate is recognized as biodegradable, nontoxic, and biocompatible. The release of MMC from the beads in 0.1 M Tris buffer was stable and continuous until about 1 week. The MMC-CH-ALG beads can be applied in the peritoneal cavity for intraperitoneal chemotherapy since they provide a good adhesiveness on the tissue and controlled release pattern of the drugs.
오차 역전 기법을 이용한 인터넷 트래픽의 분석 및 예측
이경묵,이희춘,정영준 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-
An interest in traffic analysis has been increasing to evaluate the internet performance and stability between ISPs(Internet service Providers) In general, two parameters such as delay and packet loss are used for performance analysis Existing studies only discuss traffic measurement and simple performance test to check if measured values exceed their thresholds In this paper, we present a BP(Back Propagation) based evaluation scheme for performance estimation. The BP is a neural network, which can estimate the target performance continuously applying supervised learning patterns We have collected real data by measuring delay and loss over a commercial ISP line last two months and performed the BP computation using these data Then we show that the estimation mapping formula obtained between loss and delay can be used for performance evaluation metrics.