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박혁,유호선,Park, Hyeok,Yoo, Ho-Seon 한국플랜트학회 2013 플랜트 저널 Vol.9 No.1
본 연구에서는 국내 P복합발전소에서 실제 운전 중인 순환수계통 수직펌프를 대상으로 고유진동수를 측정하고, 유체와 구조가 연성된 경우의 진동이론으로부터 고진동의 원인을 파악하였다. 현장 상황에 가장 적합하며 경제적인 공진방지 대책을 선정하여 수치해석을 통해 실효성을 미리 확인한 후 실제 시스템에 적용하는 실증시험을 실시하였다. In this study, the natural frequency of the actual operating vertical pump in the P combined cycle power plant is measured and the cause of high vibration is determined by using fluid-structure coupled vibration theory. Choosing the vibration reduction plan suited for field conditions and using the numerical analysis verify effectiveness of the plan. The plan is applied to the actual pump and the empirical experiments are conducted.
박혁,정충렬,엄안흠 한국균학회 2019 韓國菌學會誌 Vol.47 No.2
We isolated endophytic fungal strains from the roots of three medicinal crops, Ligusticum chuanxiong, Angelica gigas, and Cnidium officinale, cultivated at Yeongju, Korea. The fungal strains were identified based on their morphological characteristics and molecular analyses of their internal transcribed spacer, large subunit rDNA, and beta-tubulin regions. Thereby, we identified three previously unrecorded endophytic fungal species, Dactylonectria pauciseptata, Rhizopycnis vagum, and Sistotrema sernanderi, in Korea. In this report, we describe the morphological characteristics and phylogenetic analyses of these three fungal species.
12주간 체중기반 복합운동이 여성노인들의 신체구성과 심혈관 요인들에 미치는 영향
박혁,김대열,김도형,국두홍,조성채,김석환,김동현 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.11
본 연구는 12주간 여성노인이 체중을 이용한 복합운동(저항운동 30분, 유산소운동(30)) 참여가 그들의 신체구성(체중, 체지방률, 제지방, 신체질량지수, 근육량)과 심혈관요인(상완-발목 맥파속도, 동맥협착도)에 미치는 영향을 연구하였다. 연구의 목적을 달성하기 위해 연구에 참여한 대상자는 총 32명으로 운동그릅 16명, 통제그룹 16명으로 무선할당하였다. 운동집단은 주3회 60분씩 복합운동을 실시 하였으며, 통제그룹은 같은 기간 동안 평소와 동일한 환경에서 생활하였다. 본 연구의 통계분석은 동질성을 확보하기 위해서 모든 사전 변인들에 t-검증을 실시하였고 동질성이 확보되서 분산분석방법을 사용하였으며 유의수준은 0.05로 하였다. 연구결과 복합운동에 참여한 운동그룹과 통제그룹간에 신체구성에 대한 것은 통계적으로 유의한 차이를 보이지 않았다. 하지만 심혈관계 요인 중 복합운동 그룹의 상완-발목맥파속도 오른쪽(baPWV-Right(p=.001)), 상완-발목맥파속도 왼쪽(baPWV-Left(p=.001))은 통계적으로 유의한 감소를 나타냈고, 통제그룹은 통계적으로 유의한 차이를 보이지 않았다. 이상의 결과를 살펴보면 65세이상 여성노인이 12주간 체중을 이용한 복합운동에 참여하면 맥파속도(baPWV-Right)가 감소하고 심혈관 질환을 예방하여 노인들의 삶의 질을 높일 수 있을 것이다. This study examined effects of 12 weeks of body weight based combined exercise training (resistance training for 30 min, aerobic training for 30min) on body composition (% body fat, lean body mass, fat mass and BMI (body mass index)) and cardiovascular factors (ankle-brachial index (ABI) and brachial-ankle pulse wave velocity (baPWV)) in elderly women. A total of 32 subjects participated in this study, and were randomly divided into either exercise group (n = 16, EG) or control group (n = 16, CG). All variables at pre-test were analyzed by independent t-test for baseline test, and all data post the study period were analyzed by two-way repeated measures ANOVA with contrast testing (α = 0.05). Our results indicate that body composition (% body fat, lean body mass, fat mass and BMI) in both EG and CG do not differ significantly. However, the right and left sides of baPWV in EG was significantly reduced, as compared to CG. Taken together, these results indicate that combined exercise training for 12 weeks positively influences the cardiovascular factors, and may prevent cardiovascular diseases in elderly females (over 65 years), thereby resulting in increased quality of life for the elderly.
박혁,배선학,박선일 한국임상수의학회 2016 한국임상수의학회지 Vol.33 No.5
Epidemiological studies have shown the association between transportation of live animals and the potentialtransmission of infectious disease between premises. This finding was also observed in the 2014-2015 foot-and-mouthdisease (FMD) outbreak in Korea. Furthermore, slaughterhouses played a key role in the global spread of the FMDvirus during the epidemic. In this context, in-depth knowledge of the structure of direct and indirect contact betweenslaughterhouses is paramount for understanding the dynamics of FMD transmission. But the social network structureof vehicle movements to slaughterhouses in Korea remains unclear. Hence, the aim of this study was to configurea social network topology of vehicle movements between slaughterhouses for a better understanding of how they arepotentially connected, and to explore whether FMD outbreaks can be explained by the network properties constructedin the study. We created five monthly directed networks based on the frequency and chronology of on- and offslaughterhousevehicle movements. For the monthly network, a node represented a slaughterhouse, and an edge (orlink) denoted vehicle movement between two slaughterhouses. Movement data were retrieved from the national KoreanAnimal Health Integrated System (KAHIS) database, which tracks the routes of individual vehicle movements usinga global positioning system (GPS). Electronic registration of livestock movements has been a mandatory requirementsince 2013 to ensure traceability of such movements. For each of the five studied networks, the network structureswere characterized by small-world properties, with a short mean distance, a high clustering coefficient, and a shortdiameter. In addition, a strongly connected component was observed in each of the created networks, and this giantcomponent included 94.4% to 100% of all network nodes. The characteristic hub-and-spoke type of structure wasnot identified. Such a structural vulnerability in the network suggests that once an infectious disease (such as FMD)is introduced in a random slaughterhouse within the cohesive component, it can spread to every other slaughterhousein the component. From an epidemiological perspective, for disease management, empirically derived small-worldnetworks could inform decision-makers on the higher potential for a large FMD epidemic within the livestock industry,and could provide insights into the rapid-transmission dynamics of the disease across long distances, despite a standstillof animal movements during the epidemic, given a single incursion of infection in any slaughterhouse in the country.