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박재학,이학모,김창환,박종환 한국수의병리학회 2001 한국수의병리학회지 Vol.5 No.1
We examined the stomaches of slaughtered pigs to evaluate the gastric lesions. Gastric ulcer accompanying parakeratosis and hyperkeratosis were most frequently observed in the mucosa layer of pars oesophagea. Diffuse congestion and focal necrosis was also frequently seen on the fundus. Pierce wounds by toothpick were seen from 3 stomaches.
대칭 Galerkin 경계요소법을 이용한 유한체 내에 존재하는 임의의 삼차원 균열의 해석
박재학,김태순 한국안전학회 2004 한국안전학회지 Vol.19 No.1
Many analysis methods, including finite element method, have been suggested and used for assessing the integrity of cracked structures. In the paper, in order to analyze arbitrary three dimensional cracks, the finite element alternating method is extended The crack is modeled by the symmetric Galerkin boundary element method as a distribution of displacement discontinuities, which is formulated as singularity-reduced integral equations. And the finite element method is used to calculate the stress values for the uncracked body only. Applied the proposed method to several example problems for planner cracks in finite bodies, the accuracy and efficiency of the method were demonstrated.
청소년의 또래애착과 다문화수용의 관계에서 공격성의 매개효과와 자아탄력성의 조절된 매개효과
박재학,윤춘모 숭실대학교 영재교육연구소 2018 Global Creative Leader Vol.8 No.4
The purpose of this study was to examine whether the peer attachment of adolescents would affect their multicultural acceptance through the medium of aggression, and whether their ego-resilience would produce any protective effects to act as a buffer of the influential relationship. The 7th-year data of Korean Children and Youth Panel Survey (KCYPS) for the panel of fourth-grade elementary school students who were in the first-grade in high school as of 2016 were utilized. Out of all the data from 2,378 students, the data from 1,979 students were analyzed except some that didn't serve the purpose of the study or were uncompleted. The findings of the study were as follows: First, it's ascertained that the peer attachment of the teenagers exerted a direct influence on multicultural acceptance. In other words, the adolescents who were more attached to their peers were found to be more receptive to multiculture. Second, the peer attachment of adolescents was found to have had an impact on multicultural acceptance through the partial medium of aggression. Third, it's discovered that the ego-resilience of the teenagers buffered the relationship between aggression and multicultural acceptance and even moderated the partial mediating effect that peer attachment had on multicultural acceptance through aggression at the same time. As the findings of the study confirmed that ego-resilience produce buffering effects as a protective factor, the roles of it is of great importance, and various programs and psychoemotional support are necessary to bolster the ego-resilience of teenagers to improve their multicultural receptivity. 본 연구는 청소년의 또래애착이 공격성을 매개로하여 다문화수용에 미치는 영향을 검증하고, 그 영향관계 안에서 청소년의 자아탄력성이 이를 완충할 수 있는 보호효과성이 있는지 파악하고자 한다. 이를 밝히기 위하여 ‘한국아동·청소년패널조사(KCYPS)’중 초등학교 4학년 패널 7차년도 데이터(2016년, 고등학교 1학년)를 활용하였다. 본 연구의 대상 전체 2,378명중 무응답을 제외한 1,979명을 연구의 대상으로 분석에 활용하였다. 연구결과를 살펴보면 첫째, 청소년의 또래애착은 다문화수용에 직접적인 영향을 주는 것으로 확인되었다. 즉, 또래애착이 높은 청소년일수록 다문화수용이 높은 것으로 나타났다 둘째, 청소년의 또래애착은 공격성을 부분매개로 다문화수용에 영향을 주는 것으로 나타났다. 청소년의 또래애착은 다문화수용에 직접적인 영향을 줄 뿐만 아니라 공격성을 매개로 하여 간접적인 영향을 미치고 있는 것으로 나타났다. 셋째, 청소년의 자아탄력성은 단순히 공격성과 다문화수용 간의 관계를 완충할 뿐만 아니라 또래애착이 공격성을 거쳐 다문화수용에 미치는 부분매개효과까지 조절할 수 있는 것으로 나타났다. 즉, 청소년의 자아탄력성은 또래애착이 다문화수용에 미치는 부정적인 영향을 완화해주는 것으로 나타났다. 이러한 결과에 따라 청소년의 자아탄력성을 통해 다문화수용력을 높이기 위한 실천전략이 요구된다. 본 연구결과 자아탄력성이 보호요인으로 완충작용을 하는 것으로 확인되었으므로 자아탄력성 역할이 중요하며 청소년의 다문화수용력을 높이기 위해 자아탄력성을 높일 수 있는 다양한 프로그램과 심리·정서적인 지원이 필요하다.
박재학,석승혁,박종환,조선아 대한수의학회 2005 JOURNAL OF VETERINARY SCIENCE Vol.6 No.1
We report idiopathic intranuclear inclusion bodies in the renal tubular epithelia of two cases of among the 960 Japanese quail (Coturnix coturnix japonica) in the course of the acute oral toxicity and dietary toxicity test. Basophilic inclusion bodies were seen only in the nuclei of renal tubular epithelia. We could not classify our case into any adenovirus infection by clinical signs and lesions. The inclusion bodies were only identified as adenovirus-like particles based upon the electronmicroscopical features.
다수의 직선 다중균열이 존재하는 등방성 무한판의 교호법을 이용한 해석
박재학,Park, Jai-Hak 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.12
A method is proposed to obtain the stress intensity factors of multiple cracks lying on many straight llnes in an infinite isotropic plate. In this mehtod, analytical solutions for collinear multiple cracks subject to surface point forces are obrained and used as Green functions. For the multiple cracks lying onmany straight lines, the equivalent crack surface tractions are obtained by using the alternating method and the stress intensity factors are calculated. By using the proposed method several useful problems are solved and discussed.