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샌드 드레인으로 개량된 점토지반의 내부거동에 대한 압밀변형 메커니즘
백원진,Baek, Won-Jin 한국농공학회 2006 한국농공학회논문집 Vol.48 No.6
In this study, the large scaled model test improved by sand drain was carried out to clarify the internal behavior of the three-dimensional consolidation under different secondary consolidation periods. From the results of model test, the void ratio in the undrained side was lager than in the drained side. In addition, the unconfined compressive strength in the long-term consolidated specimen was larger than that in the short-term consolidated one. It was also found that the unconfined compressive strength was larger in the drained side than in the undrained side. These reasons are considered to be due to the large effective stress by quick pore water pressure dissipation by the short drainage distance in the drained side. Furthermore, in order to investigate the three-dimensional consolidation behavior of clay ground improved by the vertical drain method, the numerical analysis obtained from the three-dimensional elasto-viscous consolidation theory proposed by author (2006) were compared with the test results. It was found that during the three-dimensional consolidation process not only vertical displacement but also radial displacement occurs inside the specimen.
뷰티왁싱 요법에 대한 추구혜택이 재이용의도에 미치는 영향
백원진,한채정,Baek, Won-Jin,Han, Chae-Jeong 중소기업융합학회 2020 융합정보논문지 Vol.10 No.9
본 연구는 성인 남,녀를 대상으로 소프트 왁싱, 하드 왁싱 슈가링에 대한 추구혜택이 재이용의도에 미치는 영향에 대해서 알아 보는 것에 목적이 있으며 이를 통해 왁싱을 처음 접하는 일반인들에게 유용한 정보가 되는 것에 연구의 의의가 있다. 연구방법으로는 부산과 영남권에 거주하는 17세 ~ 40대 왁싱 경험이 있는 남,녀 422명을 대상으로 연구자가 직접 설문을 진행하였으며 분석방법은 교차분석, 독릭표본 t-검정, 상관분석, 선형회귀분석, 복수응답은 Multiple response test를 이용하여 자료를 분석하였다. 연구결과에서는 왁싱 추구혜택이 재이용의도에 미치는 영향에 대한 결과를 살펴보면 부위별 왁싱 추구 점수, 왁싱 혜택 총 점수(r=0.389, p<0.001) 및 재이용의도 총 점수(r=0.214, p>0.001)와 유의한 양의 상관성을 보였으며, 부위별 왁싱추구혜택 및 재이용의도의 관련성을 보면 바디(팔, 다리)를 제외 한 항목들을 유의한 양의 관련성을 나타내었다. 왁싱 추구혜택이 재이용의도에 미치는 영향에 대한 결과를 살펴보면 페이스 왁싱, 브라질리언 왁싱 및 왁싱 혜택 총 점수 모두 재이용의도에 유의한 영향을 주는 것으로 나타났다. 연구의 내용을 통해 아직 슈가링의 인지도는 낮으나 호의적인 감정 및 재이용의도가 높고 예민한 부위일수록 추구하는 것을 알 수 있었다. 따라서, 왁싱을 접하는 소비자들에게 유용한 정보를 제공하고 향후 왁싱 관련 연구의 기초자료를 제공할 수 있을 것으로 기대한다. The aim of the study is to investigate the effect of the benefit of soft waxing, hard waxing, and sugaring waxing on intention to reuse in Korean adults, and to provide useful information to people who are new to waxing. As a research method, from May 1, 2019 to August 30 (17 weeks), we surveyed 422 subjects between 10 and 40 years old who lived in Busan and Yeongnam area and experienced waxing. In statistical analysis, Cronbach's alpha was calculated for reliability test, and Chi-squared test, independent t-test, correlation analysis and linear regression analysis were used. Multiple responses were analyzed using multiple response test. In the result of the effect of waxing benefit on intention to reuse, there was a significant positive correlation of waxing seeking score by body part, total waxing benefit score(r=0.389, p<0.001), and total score of intention to reuse (r=0.214, p>0.001) with intention to reuse. There was also a significant positive correlation between waxing benefit by body part and intention to reuse, except arms and legs. In the result of the effect of waxing benefit on intention to reuse, face waxing (β=0.106, p<0.001), Brazilian waxing (β=0.221, p<0.001) and total waxing benefit score (β=0.321, p<0.001) had a significant effect on intention to reuse. In the present study, awareness of sugaring waxing was low but favor and intention to reuse were strong, and the subjects sought sugaring waxing for sensitive body parts. Thus, would provide useful information for consumers new to waxing, and also basic information for studies on waxing.
1차압밀과정중의 크리프의 영향을 고려한 연약 점성토지반의 침하거동 해석
백원진,松田博,최우정,김찬기,송병관 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.5
This paper is performed to examine the effect of creep during the primary consolidation and the applicability of the Yin’s EVP (Elasto-Visco-Plastic) model. In ordinary consolidation theories using the elastic model, the primary consolidation process can be expressed but the secondary consolidation process cannot. It is due to the viscosity, which can express the secondary consolidation, and is sometimes related to the scale effect (difference of the thickness of clay layer between laboratory sample and field condition) such as hypotheses Type A and Type B shown by Ladd et al. (1977). Usually, the existence of the creep during the primary consolidation has been confirmed and the Type B is well acceped. On the other hand, from the large-scaled consolidation tests the intermediate characteristic between Type A and Type B was proposed as Type C by Aboshi (1973). In this study, to clarify the effect of creep on the settlement-time relation during the primary consolidation in detail, Type B consolidation tests were performed using the separate-type consolidation test apparatus for a peat and clay. Then the test results were analyzed by using Yin’s EVP Model (Yin and Graham, 1994). In conclusion, followings were obtained. At the end of primary consolidation, the compression for the subspecimens should not be the same because of the difference of the excess pore water pressure dissipation rate. And the average settlement measured by the separate-type consolidometer coincides with the analyzed one using the Yin’s EVP model. As for the dissipation of the excess pore water pressure, however, the measured excess pore water pressure dissipates faster compared with the Yin’s model.
백원진,하성호,이강일,김진영,김주현 한국지반공학회 2010 한국지반공학회논문집 Vol.26 No.8
In this study, in order to investigate the characteristics of secondary consolidation in the soft clay ground, oedometer tests were carried out in a normally consolidated condition, and the consolidation characteristics of the soft clay ground were examined by the Finite Difference Method (FDM) based on the Elasto-Viscous model proposed by Yoshikuni. The consolidation tests adjusted the consolidation load increment ratio() to 1.0 for the four cases with initial consolidation pressures of 0.8, 1.6, 3.2, and 6.4 kgf/cm2. The long-term consolidation tests were examined by the tests that changed the load increment ratio to clarify the effect of consolidation load increment. Although the numerical analysis was delayed in the primary consolidation process, from the result of the numerical analysis of the laboratory tests, the applicability of the Elasto-Viscous model was verified from the agreement of the secondary consolidation process. Based on the developing of model ground consist of general soft clay, influences of consoliation parameters on the consolidation characteristics were studied by the numerical analysis.