Wood-PP composite materials were prepared by Taguchi robust design method with L9 orthogonal array to optimize experimental conditions. Tensile strength of the composite materials was considered as the main properties. Amount of wood powder and modifier of resin were chosen as significant parameters. As the result of Taguchi analysis in this study, the amount of wood powder was the most influencing parameter on the increase of tensile strength. The optimal conditions were determined and these results were good agreement with data analyzed by Taguchi robust design method.

A comparative analysis of the hindered amine light stabilizers (HALS) and UV abosrber (UVA) and their respective photostabilizing effect on wood plastic composites (WPCs) are reported in this study. The influence of accelerated weathering on the mechanical properties of the composites and the microscopic morphology of a degraded layer on the cross section and the surface were studied. UV absorbers were more efficient at preventing composite lightening than was UV stabilizer. The amount of whitening decreased with the increase of photostabilizers. With the addition of a UV absorber (Tinuvin360), the tensile modulus and strength of the composites increased slightly. However, the addition of a light stabilizer (Tinuvin770) and a UV absorber decreased the tensile modulus and strength of the composites. After 250 and 500 hr exposure, tensile modulus and strength of the un stabilized and stabilized composites decreased. The tensile strength of UV absorber (Chimassorb81)-stabilized composites was significantly greater than that of control and light stabilizer (Tinuvin770)- and UV absorber (Tinuvin360)-stabilized composites. UV absorber-stabilized samples showed less whitening and photodegradation than control and light stabilizer-stabilized samples.

산느타리버섯(Pleurotus pulmonarius (Fr.) Quelet)은 담자균문, 주름버섯목, 송이과, 느타리 버섯속에 속하며 성숙한 갓의 모양은 폐모양이며 자실체는 여름에서 초가 을 사이에 침엽수의 죽은 부위에서 발생하며 항염증, 항콜 레스테롤, 항고지혈증의 생리활성을 가지고 있는 것으로 알려져 있다. 본 실험은 새로운 유망 야생버섯을 개발하 기위하여 강원도 내·외에서 수집한 산느타리버섯 10계 통에 대하여 균사배양 특성 및 병재배시 자실체 특성을 검 정하여 수량 및 품질이 우수한 GWM-20107 등 4계통을 1차로 선발한 후 선발된 4계통의 단포자 분리 및 4계통간 교배를 하여 교배계통 600계통을 육성하고, 육성된 교배 계통에 대한 2차 선발을 하여 강원도 자생종 수집계통인 GWM20107와 GWM20148 과의 교배계통으로서 Ppm- 430 계통을 우량계통으로 선발하였다. 선발된 Ppm- 430계통의 주요 특성으로는 자실체 발생온도는 16∼ 18℃, 생육온도는 15∼17℃이며 850㎖ 병재배가 적합하 며 병재배시 군사배양기간은 32일이며 균긁기 후 초발이 소요일수는 3.4일이었다. 자실체의 발생형은 다발형, 갓 의 단면 형태는 얕은깔떼기형, 갓의 색깔은 흑갈색, 대의 색깔은 흰색, 갓에 대한 대의 부착형은 편심형, 수량은 850㎖병당 102.2g이었으며 맛과 색깔이 양호하였으며 적합한 배지조성은 미송톱밥25+면실박20+콘코브25+ 비트펄프30%이었다.

Program provider industry has grown in terms of market size volume since start of cable TV in Korea. However, it is facing a serious problem in producing quality original cable programming. The low cable TV subscription fee essentially limits the program compensation to program providers at unreasonably lower level. Since the compensation from cable TV system operator is low, most of program providers heavily depend on home shopping commission fee for survival. This study analyzes the structure of program provider industry. This study indicates that horizontal and vertical integration becomes more popular in big players at both system operator and program provider level.

The main goal of this work is to study the effects of temperature and volume fraction of fiber on the Charpy impact test with GF/PP composites. The critical fracture energy and failure mechanisms of GF/PP composites are investigated in the temperature range of 60℃ to -50℃ by impact test. The critical fracture energy increased as the fiber volume fraction ratio increased. The critical fracture energy shows a maximum at ambient temperature and it tends to decreases as temperature goes up or goes down. Major failure mechanisms can be classified such as fiber matrix debonding, fiber pull-out and/or delamination and matrix deformation.

An emulsion of octadecamidoethylaminoethyl dodecate (which provides softness) and an emulsion silicone oil KF-96 (which provides lubricity) were separately synthesized. Then PP finishing softeners (SSA-7) was prepared by blending of the synthesized emulsions with beef tallow hardened oil (a softness improving agent). PP finishing treatment was carried out with the prepared SSA-7 and PP finishing resin by a one bath method, and several physical properties were tested. As a result, crease recovery, tear strength, softness, lubricity, and bending resistance were all good, indicating that the prepared SSA-7 is a good PP finishing softener.

The main goal of this work is to study the effect of glass fiber volume fraction on the result of tensile test with respect to glass fiber/polypropylene(GF/PP) composites. The tensile test and failure mechanisms of GF/PP composites were investigated in the fiber volume fraction range from 10% to 30%. The tensile strength and the fracture strength increased with the increasing of the fiber volume fraction in the tested range. Fiber pull-out and debonding of this composites increased with the fiber volume fraction in thc tested range. The major failure mechanisms were classified into the debonding, the fiber pull out, the delamination and the matrix deformation.

Pyrolysis of polypropylene(PP) Was performed to find the effects of the pyrolysis temperature(425, 450, 475 and 500℃) and the pyrolysis time(35, 50 and 65minutes), respectively. Conversion and liquid yield obtained during PP pyrolysis continuously increased with the pyrolysis temperature( up to 500℃) and the pyrolysis time(up to 65minutes), especially these were more sensitive to the pyrolysis time at 425℃ than other pyrolysis temperatures. Each liquid product formed during the pyrolysis was classified into gasoline, kerosene, light oil and wax according to the distillation temperature based on the petroleum product quality standard of Korea Petroleum Quality Inspection Institute. The liquid products of PP pyrolysis up to 450℃ were almost same fractions(26±3wt.% gasoline, 20±2wt.% kerosene and 23±2wt.% light oil) except wax(3~13wt.%). On the other hand, the pyrolysis of PP from 475℃ to 500℃ produced 26±3wt.% wax, 24±1wt.% gasoline, 18±1wt.% kerosene and 16±1wt.% light oil. After all, the main liquid product changed from gasoline to wax with increasing pyrolysis temperature.

Isothermal pyrolysis of high density polyethylene(HDPE), polypropylene(PP) and polystyrene(PS) was performed at 450℃, respectively. The effect of pyrolysis time on yield and product composition was investigated. Conversion and liquid yield obtained during HDPE pyrolysis continuously increased with time up to 80minutes, but those of PP and PS did not largely change after 35minutes. Each liquid product formed during the pyrolysis was classified into gasoline, kerosene, light oil and wax according to the distillation temperature based on the petroleum product quality standard of Korea Petroleum Quality Inspection Institute. The major liquid product of HDPE pyrolysis was light oiH34 wt.% based on the amount of HDPE treated) and the amounts of the other liquid ingredients(gasoline, kerosene and wax) were almost the same. On the other hand, the pyrolysis of PP produced 27 wt.% gasoline, 22 wt.% kerosene, 24 wt.% light oil and 13wt.% wax, and the pyrolysis of PS produced 56 wt.% gasoline, 12 wt.% kerosene, 9 wt.% light oil and 13 wt.% wax.

A silicone softner (SS-5), a permanent press (PP) finish, was prepared by blending silicone oil KF-96 (as a lubricating component) and beef tallow hardened oil (as a softening component) which was synthesized from fatty polyamide salts. The prepared SS-5 and the PP finishing resin were applied to PP finishing cotton cloth and P/C gingham sample by one-bath method. The properties such as crease recovery, tear strength, and bending resistance were tested. The samples treated with SS-5 and PP finishing resin showed improved properties when comparing with the untreated ones, with the ones treated only with PP finishing resin, with ones treated with commercial PP finishing softners and PP finishing resin. The grades of fabric samples treated with 3% SS-5 were fifth grade in the bending resistance test.

섬유함유율이 0%, 20% 그리고 30%인 단섬유 GF/PP 복합재료를 사용하여 80℃, 50℃ 그리고 실온에서 인장시험을 통하여 온도의 변화에 대한 파괴강도의 거동을 고찰한 결과는 다음과 같다. 1) 유리섬유로 강화하지 않은 순수 PP보다 유리섬유로 강화한 복합재료의 인장강도가 높게 나타났으며 섬유함유율이 증가할수록 그 값은 높게 나타났다. 2) 동일한 섬유함유율을 가지는 GF/PP 복합재료의 온도변화에 따른 인장강도는 실온의 경우가 가장 높게 나타나고 고온으로 갈수록 그 값이 낮게 나타났다. 3) GF/PP 복합재료의 파괴기구는 온도의 변화에 따라 매트릭스의 변형이 나타났으며 섬유의 풀아웃, 섬유와 매트릭스 사이의 디본딩을 관찰할 수 있었으며, 이와 같은 파괴기구가 종합적으로 상호작용한다고 생각된다.

국제 공통평가기준(CC)은 정보보호제품의 개발. 평가. 사용을 위한 ISO 15048 국제 표준이다. 국제 공통평가기준의 제 2 부 보안기능 요구사항은 정보보호제품의 보안 기능을 11개 클래스로 분류하였고, 13개국 인증제품 상호승인 협정(MRA)에 의하여 교차 사용이 가능한 평가된 보안제품을 해설할 수 있는 공통 언어로써 사용할 수 있다. 보호프로파일(PP)은 특정형태의 제품군이 지녀야 할 보안 목적을 사용자 그룹에서 요구한 명세서이다. 보호프로파일은

인공폐는 실제 폐의 기능을 대행하는 장치이며, 주요 기능은 정맥혈에서 이산화탄소를 제거하고 산소를 첨가하여 동맥혈화하여 개심수술시 신체의 모든 조직에 충분한 양의 동맥혈을 공급한다. 또한 체외순환 생명보조장치(ECLS 또는 ECMO)는 심한 호흡부전증에 일반적으로 이용되지만 미래의 폐 이식에 사용될 것이다. 현재 미세다고엉 폴리프로필렌 중공사를 사용하고 있는 막형 인공 폐는 두 가지 문제가 있다. 환자의 체계적인 항응고가 필요하며, 오랜 기간의 사용은 막을 통하여 혈액 쪽에서 가스 쪽으로 혈청 누출을 일으킨다. 본 연구는 미세다공성 폴리프로필렌(PP)막에 폴리디메틸실록산(PDMS)을 적충한 PP/PDMS막을 제조하고, 폴리프로필렌 막에서 유발하는 혈청 누출을 최소화하는 기술에 대하여 연구하였다. Lee-White법에 의한 whole blood의 혈전형성 실험 후 사용된 막의 기체 투과도는 PP막에서는 크게 저하되었지만, PP/PDMS막에서는 거의 동일하게 유지되었다. 그러므로 PP막에서 유발되는 혈청 누출을 PP/PDMS막에서는 해결할 수 있었다. 또한, PP/PDMS막에서는 이산화탄소의 기체토과율이 산소보다 11.5배였다.