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박정우,마정화 한국세무학회 2006 세무학 연구 Vol.23 No.4
Park Jeong-woo*Ma Jeong-hwa** 박정우**마정화***
박정우,정영도,임진선,정진훈 한국도로학회 2009 한국도로학회논문집 Vol.11 No.4
콘크리트 슬래브는 타설 후 온도와 수분 변화를 통해 체적이 변화한다. 수분증발에 의하여 발생한 건조수축은 슬래브의 자중이나 하부층과의 마찰 등에 의하여 구속되어 슬래브 내부에 응력이 유발된다. 선행 연구에 의하면 건조수축에 의하여 발생된 실제 인장응력은 이론적으로 예측된 값보다 작은 것으로 보고되었다. 이는 부분적으로 구속된 슬래브에서 발생하는 초기 재령 콘크리트의 점탄성에 기인한 응력감소 현상이다. 본 연구에서는 재령에 따른 콘크리트의 응력감소 현상을 조사하기 위하여 구속된 원주형, 구속되지 않은 자유건조 원주형, 그리고 자유건조 각주형 콘크리트 시편의 변형률을 측정하였다. 재령 1, 3, 7, 14, 28일에 콘크리트의 탄성계수를 측정하였으며 관입저항 실험을 실시하였다. 실험결과를 기존 연구자들이 제안한 이론식에 대입하여 구속된 원주형 콘크리트 시편의 응력감소를 계산할 수 있었다. 향후 본 연구의 결과를 바탕으로 구속된 콘크리트 시편의 응력감소 현상을 콘크리트 포장의 설계에 적용할 예정이다. Volume of concrete slab changes by variations of temperature and moisture after its placement. Shrinkage due to evaporation causes tensile stress in the slab when contraction of the slab is restrained by its self weight, friction with subbase, and etc. Actual tensile stress caused by the shrinkage was less than theoretically predicted stress according to previous studies. It was the stress reduction due to visco-elastic property of the early-age concrete slab partially restrained. In this study, strains of restrained circumferential, unrestrained circumferential, and unrestrained square pillar concrete specimens were measured to investigate stress reduction of the specimens with age of concrete. Elastic modulus of the concrete was measured at the age of 1, 3, 7, 14, 28 days and penetration test was performed. The stress reduction was calculated by input the test results into theoretical equations suggested by previous researchers. The stress reduction of the restrained concrete specimens will be applied to design of concrete pavements based on results of the study.
High-Speed Traveling-Wave Photodetector with a 3-dB Bandwidth of 410 GHz
박정우,한상필,이동훈,류한철,신준환,김남재,윤영종,고현성,박경현 한국전자통신연구원 2012 ETRI Journal Vol.34 No.6
A high-speed traveling-wave photodetector (TWPD) with an InGaAs absorber is designed and realized. The bandwidth of the TWPD is measured using electro-optic sampling techniques. The bandwidth is 410 GHz, which shows that the RC limitation is overcome. While the TWPD shows a low responsivity of 0.06 A/W at 1,550 nm, this value can be improved through further optimization of the structure without a sacrifice in bandwidth.
감정노동자들이 제공하고 있는 직업 이미지 및 직업선호도가 직업선택에 미치는 영향
박정우 관광경영학회 2018 관광경영연구 Vol.83 No.-
In these days, emotional labor's problem is well known over the society. Emotional labors are couldn't protected by labor industry and it is cause from low-customer recognition and manpower shortage. As a result, emotional labors are often change there jobs and company can not hire well-mastered employees. In this study, researcher try to find out relationship among emotional labor's job image, job preference and job choice for help company to stabilizing there employment. To figure out casual relationship, 192 data are collected from related major students and job applicants for empirical analysis. Result of empirical study is that emotional labor's job image has positive effect on job preference and job preference has positive effect on job choice. And also result show us that job image which is 'service providing' has more possitive effect on job preference. Base on this results, researcher provide a managerial implications for labor stabilizing of company.