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Wood Flour 폴리프로필렌 복합재료의 기계적 특성: 반복적 온도 변화의 영향
이선영 ( S. Y. Lee ),전상진 ( S. J. Chun ),도금현 ( G. H. Doh ),박상범 ( S. B. Park ),최수임 ( S. I. Choi ) 한국고무학회 2011 엘라스토머 및 콤포지트 Vol.46 No.3
본 연구에서는 반복적인 온도변화가 목분(50 wt.%와 70 wt.%)이 첨가된 폴리프로필렌 WPC(Wood Plastic Composites)의 기계적 특성에 미치는 영향을 조사하였다. WPC의 휨탄성계수(flexural modulus)와 휨강도(flexural strength)는 반복 회수에 상관없이 동결·융해 시험에서 계면접착력의 약화 때문에 감소하는 경향을 보였다. 목분의 함량이 높을 때, 휨탄성계수의 감소가 비교적 높았다. WPC의 휨탄성계수와 휨강도는 고온(60 ℃)·저온(-20 ℃) 반복시험 후 고온에서 감소하고 저온에서 증가되었다. 폴리프로필렌(polypropylene, PP)의 유리전이점(glass transition temperature: -10 ℃) 보다 낮은 저온(-20 ℃)에서 WPC는 높은 강성(stiffness)과 강도(strength)를 유발시키는 유리상태(glassy state)로 존재한다. 고온에서 목분의 함량이 낮은 WPC가 연성의 증가 때문에 낮은 휨탄성계수와 휨강도를 보였다. The effect of cycled temperature change on the mechanical properties of wood flour(50 wt.% and 70 wt.%) polypropylene WPC(Wood Plastic Composites) was investigated in this study. Flexural modulus and flexural strength of the WPC showed a decrease due to the degradation of interfacial adhesion between polymer matrix and wood flour by the freeze-thaw test regardless of the cycled number. At the higher loading level of wood flour, the reduction of the flexural modulus was remarkable. After the cycled heat-freeze test, it was found that the flexural modulus and flexural strength of the WPC were lower at the high temperature (60 ℃) and higher at the low temperature (-20 ℃). At the low temperature (-20 ℃) which is below glass transition temperature of polypropylene (-10 ℃), WPC is in a glassy state which brings about the high stiffness and strength. At the high temperature (60 ℃), the flexural modulus and flexural strength of the WPC with 50 wt.% wood flour were lower because of the increase of polymer ductility.
소속감과 정서적 고갈 그리고 지각된 정의가 이직의도와 조직에 대한 부정적 구전에 미치는 영향 -파업 후 복귀한 A항공사 운항승무원을 대상으로-
김윤석 ( Y. S. Kim ),박상범 ( S. B. Park ),김기웅 ( K. W Kim ),오병철 ( B. C. Oh ),( M. A Hossan ) 한국항공운항학회 2008 한국항공운항학회지 Vol.16 No.3
Recently industries have started to recognize the importance of word-of-mouth marketing and human resource management especially for airline industries who suffer from pilot shortage. Pilots are very important component of airline company and require a lot of money and time to assession, training and maintaining certified license validity. This study is to test the effect of airline pilot`s organizational identification, emotional exhaustion and perceived justice on turnover intention and negative word-of-mouth on airline union pilots returned from the strike. This study used both literary method and empirical method. The researcher did literary study based on the previous study, designed the research model and hypothesis, did questionnaire survey to the Union member pilot from year 2005 strike for the subject of study to verify hypothesis and analysed empirically the finding using SPSS12.0 program. The major findings of this study may be summarized as follows, (1) organizational identification has a negative effect on turnover intention and negative word-of-mouth, (2) emotional exhaustion has a positive effect on turnover intention and negative word-of-mouth, (3) perceived justice has a negative effect on turnover intention and negative word-of-mouth.
공항운영기업의 브랜드 아이덴티티 구축에 관한 연구 -한국공항공사를 중심으로-
장순자 ( S. J. Chang ),김기웅 ( K. W. Kim ),박상범 ( S. B. Park ),오병철 ( B. C. Oh ) 한국항공운항학회 2007 한국항공운항학회지 Vol.15 No.4
The aviation industry is expected to grow faster and the role of it is expected to be bigger as time goes by. Airport operating company is a major part of the aviation industry. For an airport operating company to be successful, strong relationship with customers is essential. One of the methods to acquire the customer loyalty is establishing a brand. For KAC, `Skycity` should be chosen as the main brand. And along with it, harmonious modeling of CI of KAC and BI of Skycity should be devised. By doing this, KAC can gain customers` affection and loyalty.