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감시ㆍ단속적 근로자 문제점에 대한 고찰:시설경비업 중심으로
박용구,김동제,박수현 한국민간경비학회 2017 한국민간경비학회보 Vol.16 No.4
Study based on grounded theory through literature review and investigation on preceding studies and drew out problems and directions for improvement through related articles, cases and in-depth interviews with experts. Study classified drawn-out problems into 4 categories, which are salary, working hours, security work and recognition; First, intermittent security workers are afraid to be dismissed although their salary is gradually rising, which they perceive may make their employment unstable. This problem of salary basically comes from the bidding method called ‘the lowest-bidding price system.’ Second, security guards are working longer hours than other jobs, which causes various problems. Long working hours lowers work efficiency and causes health problems for the security guards and they do not have proper free time to take rest and have meals. As a measure to solve these problems, various methods of work shift can be utilized. Third, security guards are spending longer hours and making more efforts on cleaning and taking care of door-to-door packages than security works, which can lead to confusion of occupational identity and negligence of security responsibilities. Fourth, owing to the negative images of ‘employed hooligans’ or ‘servicemen’, residents are not aware of the importance of security guards and verbally abuse or even assault them and have them do what they are not supposed to do as if it were natural. Residents simply do not consider them as professionals to keep the facilities safe.
삼차원 T형강체를 이용한 편심코어를 가진 전단벽-골조 구조물의 효율적인 지진해석모델 개발
박용구,이동근,김현수,Park, Yong-Koo,Lee, Dong-Guen,Kim, Hyun-Su 한국전산구조공학회 2013 한국전산구조공학회논문집 Vol.26 No.1
전단벽-골조 구조시스템의 구조적인 거동은 휨거동하는 전단벽과 전단거동하는 골조의 상호작용에 의하여 결정된다. 이러한 전단벽-골조 구조물의 거동특성을 효과적으로 고려하기 위하여 선행 연구에서는 2차원 T형 강체를 사용한 단순 해석모델을 제안하였다. 본 논문에서는 이를 바탕으로 편심코어를 가진 전단벽-골조 구조물에 대한 효율적인 해석모델을 제안한다. 2차원 등가모델을 3차원으로 확장하여 비틀림 거동을 고려할 수 있도록 하였고, 그 결과 제안하는 등가모델이 편심코어를 가지는 전단벽-골조 구조물에도 적용가능 하도록 하였다. In a shear wall-frame structural system, the structural response is determined by the interaction between the shear wall in bending mode and the frame in shear mode. In order to effectively consider these characteristics of a shear wall-frame structure, the simplified numerical model using the T-shape rigid body was suggested in the previous study. Based on the previously proposed model, an efficient numerical model for a wall-frame structure with an eccentric core has been proposed in this study. To this end, the previously proposed 2D model is extended to the 3D model and it is enhanced by considering torsion effects. As a result, the enhanced model can be applied to the analysis of a wall-frame structure with an eccentric core as well as a centric core.
몇가지 삼림수종 (森林樹種) 종자발아에 (種子發芽) 대한 낙엽송엽 (落葉松葉) 추출물의 Allelopathic 효과
박용구,강군수,신동일 ( Young Goo Park,Goon Su Kang,Dong Ill Shin ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.1
Inhibitory effect of L. leptolepis fallen leaf extracts on the germination of Pinus densiflora, × Pinus rigitaeda, Pinus rigida, Pinus thunbergii and Larix leptolepis was investigated. Germination of those seeds in culture room and in pot at field showed the highly significant inhibitory effects by the aqueous extracts from L. leptolepis fallen leaves. Among them L. leptolepis was the most severely inhibited by the aqueous extracts used. To identify allelopathic substances, thin-layer chromatography was employed. Gallic, ferulic, t-cinnamic and vanillic acids were identified from fallen leaves of L. leptolepis. From the results, it is assumed that autotoxicity of L . leptolepis may act as inhibitory factors on germination of the species in natural stands.
현사시나무 기내배양 엽육조직에서 분리된 원형질체 배양 및 식물체 재분화
박용구,손성호 ( Young Goo Park,Sung Ho Son ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.2
The leaf mesophyll protoplasts of Populass alba × glandrdosa were isolated from leaf of plantlet in vitro and cultured for plant regeneration. The MS medium (minus NH₄NO₃) with 0.5 ㎎/ℓ BAP and 2.0 ㎎/ℓ 2, 4-D showed the moderate frequency of dividing protoplasts cultured by the lipuid plating method during the first week of culture. The percentage of colony formation was revealed the highest frequency by the gauze contained semi-solid agar plating method after 5 weeks cultured. Ridding out the gauze, the micro-callus was formed on the same semi-solid medium in 8 weeks after protoplasts culture. For proliferation of callus, mini-callus was transferred on the MS solid medium with 0.5 ㎎/ℓ 2, 4-D and 0.1 ㎎/ℓ BAP 12 weeks after culture. Shoot regeneration occurred when the calli derived from protoplasts were cultured on MS medium with 1.0 ㎎/ℓ zeatin and such shoots could be readily rooted on the one half strengthen MS medium with non-phytohormone. Rooting shoots were planted in green-house 22 weeks after protoplast culture.