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초등학교 태권도 수련생의 사회적 친밀성이 학교생활적응에 미치는 영향
박해원,손원일 대한무도학회 2022 대한무도학회지 Vol.24 No.4
이 연구는 초등학교 태권도 수련생의 사회적 친밀성이 학교생활적응에 미치는 영향을 검증하는데연구의 목적이 있다. 초등학교 태권도 수련생을 연구대상으로 선정하였으며, 사회적 친밀성과 학교생활적응을 측정할 수 있는 척도를 본 연구에 맞게 수정하여 설문조사를 실시하고 자료를 수집하였다. 수집된 자료는 탐색적 요인분석과 크론바흐 알파 계수를 이용하여 적합도와 신뢰도를 검증하였다. SPSS 26.0 프로그램을 이용하여 사회적 친밀성이 학교생활적응에 미치는 영향을 검증하였다. 통계분석은 상관관계분석과 회귀분석을 실시하였으며, 모든 통계적 유의수준은 .05로 설정하였다. 연구 결과첫째, 사회적 친밀성은 학교생활적응과 통계적으로 유의한 상관이 있는 것으로 나타났다. 둘째, 사회적 친밀성은 학교생활적응에 통계적으로 유의한 영향을 미치는 것으로 나타났다.
박해원 한국식품유통학회 2023 食品流通硏究 Vol.40 No.4
The purpose of this study was to analyze chicken consumption behavior in COVID-19 and inflation era using fixed effect panel regression and negative binomial regression. Two kinds of data were used, viz. the agricultural food consumer panel data of the Rural Development Administration(RDA) and consumer price survey of Statistics Korea. The result of the analysis revealed that several factors including covid, first difference of CPI, bok-nal dummy, household income, adult child dummy, age dummy are significantly correlated with chicken purchases per month. And covid, first difference of CPI, bok-nal dummy, household income, age are significantly correlated with number of chicken purchases per month. Thus mitigation policies in a pandemic could lead to decreasing chicken consumption. chicken farm should be aware to changing environment due to post COVID-19. Also To promote chicken consumption, It is important that promotion need to consider seasonal demand and social statistics.
박해원,문기훈,서진석,이찬희,정진훈 한국도로학회 2019 한국도로학회논문집 Vol.21 No.4
PURPOSES : It is well known that low temperature cracking is one of the most serious distresses on asphalt pavement, especially for northern U.S. (including Alaska), Canada and the northern part of south Korea. The risk of thermal cracking can be numerically measured by estimating thermal stress of a given asphalt mixture. This thermal stress can be computed by low temperature creep testing. Currently, in-direct tensile (IDT) mixture creep test mentioned in AASHTO specification is used for measuring low temperature creep properties of a given asphalt mixture. However, IDT requires the use of expensive testing equipment for performing the sophisticated analysis process, however, very few laboratories utilize this equipment. In this paper, a new and simple performance test (SPT) method: bending beam rheometer (BBR) mixture creep testing equipment is introduced, and the estimated experimental results were compared with those of conventional IDT tests. METHODS: Three different asphalt mixtures containing reclaimed asphalt pavement (RAP) and roofing shingles were prepared in the Korea Expressway Corporation (KEC) research laboratory. Using the BBR and IDT, the low temperature creep stiffness data were measured and subsequently computed. Using a simple power-law function, the creep stiffness data were converted into relaxation modulus, and subsequently compared. Finally, thermal stress results were computed from relaxation modulus master curve using Gaussian quadrature approach with condierations of 24 Gauss number. RESULTS: In the case of the conventional asphalt mixture, similar trends were observed when the relaxation modulus and thermal stress results were compared. In the case of RAP and Shingle added mixtures, relatively different computation results were obtained. It can be estimated that different experimental surroundings and specimen sizes affected the results. CONCLUSIONS: It can be said that the BBR mixture creep test can be a more viable approach for measuring low temperature properties of asphalt mixture compared to expensive and complex IDT testing methods. However, more extensive research and analysis are required to further verify the feasibility of the BBR mixture creep test.
공항 콘크리트 포장 구조해석을 위한 3차원 유한요소 모형 개발
박해원,심차상,임진선,조남현,정진훈 한국도로학회 2017 한국도로학회논문집 Vol.19 No.6
PURPOSES: In this study, a three-dimensional nonlinear finite element analysis (FEA) model for airport concrete pavement was developed using the commercial program ABAQUS. Users can select an analysis method and set the range of input parameters to reflect actual conditions such as environmental loading.METHODS : The geometrical shape of the FEA model was chosen by considering the concrete pavement located in the third-stage construction site of Incheon International Airport. Incompatible eight-node elements were used for the FEA model. Laboratory test results for the concrete specimens fabricated at the construction site were used as material properties of the concrete slab. The material properties of the cement-treated base suggested by the Federal Aviation Administration(FAA) manual were used as those of the lean concrete subbase. In addition, preceding studies and pavement evaluation reports of Incheon International Airport were referred for the material properties of asphalt base and subgrade. The kinetic friction coefficient between the concrete slab and asphalt base acquired from a preceding study was used for the friction coefficient between the layers. A nonlinear temperature gradient according to slab depth was used as an input parameter of environmental loading, and a quasistatic method was used to analyze traffic loading. The average load transfer efficiency obtained from an Heavy falling Weight Deflectomete(HWD) test was converted to a spring constant between adjacent slabs to be used as an input parameter. The reliability of the FEA model developed in this study was verified by comparing its analysis results to those of the FEAFAA model.RESULTS : A series of analyses were performed for environmental loading, traffic loading, and combined loading by using both the model developed in this study and the FEAFAA model under the same conditions. The stresses of the concrete slab obtained by both analysis models were almost the same. An HWD test was simulated and analyzed using the FEA model developed in this study. As a result, the actual deflections at the center, mid-edge, and corner of the slab caused by the HWD loading were similar to those obtained by the analysis.CONCLUSIONS : The FEA model developed in this study was judged to be utilized sufficiently in the prediction of behavior of airport concrete pavement.
64비트 블록암호 알고리듬 HIGHT의 효율적인 하드웨어 구현
박해원,신경욱,Park, Hae-Won,Shin, Kyung-Wook 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.9
This paper describes a design of area-efficient/low-power cryptographic processor for HIGHT block cipher algorithm, which was approved as standard of cryptographic algorithm by KATS(Korean Agency for Technology and Standards) and ISO/IEC. The HIGHT algorithm, which is suitable for ubiquitous computing devices such as a sensor in USN or a RFID tag, encrypts a 64-bit data block with a 128-bit cipher key to make a 64-bit cipher text, and vice versa. For area-efficient and low-power implementation, we optimize round transform block and key scheduler to share hardware resources for encryption and decryption. The HIGHT64 core synthesized using a 0.35-${\mu}m$ CMOS cell library consists of 3,226 gates, and the estimated throughput is 150-Mbps with 80-MHz@2.5-V clock. 한국기술표준원(KATS)과 국제표준화기구(ISO/IEC)에 의해 표준으로 채택된 블록암호 알고리듬 HIGHT용 저면적/저전력 암호/복호 코어를 설계하였다. HIGHT 알고리듬은 USN, RFID와 같은 유비쿼터스 환경에 적합하도록 개발되었으며, 128 비트 마스터 키를 사용하여 64 비트 평문을 64 비트 암호문으로, 또는 그 역으로 변환한다. 저면적과 저전력 구현을 위해 암호화 및 복호화를 위한 라운드 변환 블록과 키 스케줄러의 하드웨어 자원이 공유되도록 설계를 최적화하였다. 0.35-${\mu}m$ CMOS 표준 셀 라이브러리를 이용한 합성결과, HIGHT64 코어는 3,226 게이트로 구현되었으며, 80-MHz@2.5-V로 동작하여 150-Mbps의 성능을 갖는 것으로 평가되었다.