• Title/Summary/Keyword: 중소건설현장

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Productivity and Economic Analysis of Sandwich Panel Construction Work by Shop Fabrication (공장가공에 따른 샌드위치 패널공사의 생산성 및 경제성 분석)

  • Cho, Dong-Ryul;Son, Jae-Ho;Lee, Seung-Hyun
    • Korean Journal of Construction Engineering and Management
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    • v.10 no.5
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    • pp.113-122
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    • 2009
  • The domestic construction market started to expand steadily since 1970s. The building market which utilizes a sandwich panel with advantages of economical construction expenses and convenient construction has grown rapidly in recent years. However, the companies which specialize in constructing sandwich panels are relatively small or medium size, compared with other construction companies. As a result, studies on the improvement of productivity have not been conducted sufficiently. In this study, the construction sites of sandwich panel are investigated, and the work processes by each team are analyzed. Additionally, the productivity and the construction cost of each work group are analyzed by constructing a model using the Web-Cyclone. It analyzed sensitivities about change of productivity and work costs following in processing place of the panel which is one of the productivity effect factors, so it assayed the optimized productivity by each work group and work costs. Analysis showed that 30% of productivity has improved compared with the factory processing work group, and analysis of work costs showed that about 15% of work costs was increased. Also sensitivity analysis of opening ratio showed that the work costs optimization will be accomplished when about 20% of opening was processed from the factory.

Analysis of Channel Changes in Mountain Streams Due to Typhoon Hinnamnor Flood - A Case Study on Shingwangcheon and Naengcheon Streams in Pohang - (태풍 힌남노 홍수로 인한 산지 중소하천의 하도 변화 분석 - 포항 신광천 및 냉천을 사례로 -)

  • Chanjoo Lee;Seong Gi An;Eun-Kyung Jang
    • Ecology and Resilient Infrastructure
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    • v.10 no.4
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    • pp.97-106
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    • 2023
  • This study analyzed morphological changes in the Singwangcheon and Naengcheon streams in Pohang caused by flooding due to Typhoon Hinnamnor. Analysis of the changes in river channel area from the past to recent times using aerial photos and drone-taken images showed that the river width had gradually decreased since the 1960s. However, after the flood, the river width increased again. Changes in the river cross-section before and after the flood show that a large amount of coarse sediment was deposited inside the river bend while the outer bank was eroded. The water levels calculated using HEC-RAS for the pre-flood cross-section based on the flood frequency discharges and estimated discharge from Oer Reservoir were significantly lower than the observed water level, which means that the cross-sectional change was not considered. The results of this study suggest that it is necessary to consider cross-sectional changes due to sediment transport when estimating the flood level of small and medium-sized mountain streams, and it is needed to investigate the geomorphic changes after floods.

Article - A Study on Activation of Occupational Safety and Health Agency for Reducing Industrial Accidents (Article - 산재저감을 위한 안전보건관리 대행기관의 활성화에 관한 연구)

  • Kim, Yun-Seon
    • Journal of the Korea Construction Safety Engineering Association
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    • s.54
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    • pp.29-35
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    • 2011
  • First of all, this paper investigated scrupulously Occupational Safety and Healthy Agencies which take care of nucleus roles as accident protection organ of industrial circles in our country. Catching hold of elaborately lots of problems that each Agency holds, we tried to action to correct that faulty custom and invalidism. On the other hand, we exhort and encourage more available measures helping practically to protect industrial accident of work place receiving vicarious execution. Furthermore, both in name and reality, we try to be reborn as a mission institution of accidental prevention of medium and small work place. Therefore, the purpose of the present paper is to suggest substantial counterproposal for activation of Occupational Safety and Healthy Agency.

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Development of Safety Management Software Related to the Safety Level of Small & Medium Size Construction Sites (중소규모 건설현장의 안전수준을 고려한 안전관리 프로그램의 개발)

  • 안홍섭;이재용;장명훈;최순주;고성석
    • Journal of the Korean Society of Safety
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    • v.14 no.2
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    • pp.170-177
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    • 1999
  • In these days, large construction companies computerize safety management function and use softwares but small and medium ones do not have any or little in Korea, although it is much mote necessary for the latter having high accident ratios than for the former to make efforts to develop computerized safety management tools. That is, a reason why no safety management program has been developed and construction accident are required to be reduced outstandingly, computerized safety management systems are much needed to be developed. Thus, safety management software named SAFETY PLUS has been developed in this research that has 4 management scopes classified by the size of construction project. The utilization of SAFETY PLUS will be able to increase both effectiveness and efficiency of safety management efforts and result in drastic decrease of construction accidents.

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Case Study on Prevention of Fire/Explosion Accidents caused by Chemical Substances in Small/Medium Sized Construction Sites (중소규모 건설현장 화학물질로 인한 화재·폭발 재해예방 사례연구)

  • Shin, Woonchul;Kwon, Jun Hyuk;Lee, Yong Soo
    • Journal of the Korea Safety Management & Science
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    • v.16 no.3
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    • pp.63-70
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    • 2014
  • There has been an increase in fire/explosion accidents caused by chemical substances used in new small/medium sized construction, reconstruction, or extension sites. There is vast room for improvement, especially in safety training, safety inspection, and selection of countermeasures because training, technicality, and management systems regarding fire/explosion risks in small/medium sized construction sites are very immature in most cases. The purpose of this study is to propose a differentiated technical, educational, and management application plan for preventative management of fire/explosion accidents caused by chemical substances used in small/medium sized construction sites.

인간-로봇 협업 기술에 대한 연구동향

  • Park, Dong-Il;Gyeong, Jin-Ho;Jeong, Gwang-Jo
    • 기계와재료
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    • v.22 no.4
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    • pp.76-83
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    • 2010
  • 로봇의 발전 동향을 살펴보면, 기존의 위치 기반제어를 통하여 단순반복 재생 하는 로봇에서 인간과 로봇이 협력할 수 있는 로봇으로 그리고 궁극적으로는 독자적인 작업지능을 갖고서 독립적으로 운용되거나 인간과 공존할 수 있는 로봇으로 개발되어 나아갈 것으로 예상된다. 다만 현재까지의 로봇 기술로는 로봇 독자적으로 완전한 작업지능을 구현하기가 힘들기 때문에 그 중간 단계로써 사람과의 협력 작업을 구현하고 하는 것이다. 이처럼 인간-로봇 협업 기술은 인간의 지능과 로봇의 성능을 결합하여 고도의 작업을 구현할 수 있는 기술로써 로봇의 사용법을 모르는 현장 작업자도 로봇의 말단부를 잡고 손쉽게 로봇에 명령을 지시할 수 있다. 따라서 로봇의 응용 범위가 매우 다양해지고, 특히 로봇 전문인력이 없고 다품종 변량 생산을 주로 하는 중소기업에서의 로봇 활용을 촉진시켜 작업 환경 개선과 생산성 향상이 가능해진다. 또한 제조업용 로봇 분야에서 뿐만 아니라 범용성이 강한 기술로 개인서비스 로봇에서부터 국방, 건설, 의료 등 전문 서비스 로봇에 이르기 까지 폭넓게 적용될 수 있다. 이러한 인간-로봇 협업을 위해 필요한 기술들로는 경량형 로봇팔 기술, 인간-로봇 협조 제어 기술, 인간-로봇 안전 기술, 작업자 편이를 위한 인터페이스 기술 등이 포함되며 향후 기술의 발전에 따라 그 파급효과가 극대화될 것으로 기대된다.

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중소기업현장을 가다 - 세계 일등을 꿈구며 안전보건에 올인 _한국 몰렉스

  • Choe, Jong-Deok
    • The Safety technology
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    • no.159
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    • pp.20-21
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    • 2011
  • 우리 회사의 경영방침은 "고객을 하늘처럼", "품질을 생명처럼"입니다. 그러나 궁극적인 목적은 직원과 가족의 행복입니다. 여기에 가장 우선순위를 두고 있는 사항이 바로 안전입니다. 직원이 다치고 해치면서까지 일을 한다면 절대 행복해 질 수 없는 이유인 것입니다. 또한 우리 회사가 추구하는 "고객을 하늘처럼"과 "품질을 생명처럼"을 실천할 수 없기 때문인 것입니다. 한편으로 한국몰렉스의 안전은 기업이 존립하기 위한 기반이라고 생각합니다. 위험하고 안전하지 않은 기업에는 절대 직원들이 일을 하지 않을뿐더러 이러한 기업은 곧 사라지기 마련이기 때문입니다. 따라서 우리 한국몰렉스는 앞으로도 직원의 안전을 위해 지속적인 투자와 관심으로 보다 안전한 한국몰렉스를 추구해 나갈 것입니다. 현재 길 건너편에 새로운 공장을 건설하고 있는 것도 안전시스템이 완비한 공장과 쾌적하고 즐거운 직장을 만들어주기 위함입니다. 이러한 노력은 앞으로도 계속될 것이고 이러한 기반 위에서 직원들도 자기 자신의 안전을 위해 기준을 준수하는 생활을 해줄 것으로 믿습니다.

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Analysis of the relationship between satisfaction and use value of the amount of construction technology information provided (건설기술정보 제공물량의 만족도 및 사용 가치 간의 관계 분석)

  • Seong Yun Jeong;Jin Uk Kim
    • Smart Media Journal
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    • v.12 no.11
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    • pp.154-164
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    • 2023
  • The Construction Technology Information System collects, processes, and provides the public with free of charge 16 types of construction technology-related texts or index information, such as construction standards, construction practices, and construction reports, required at construction sites to enhance domestic construction technology. This study judged that user satisfaction could be increased if the budget was allocated first to the most effective construction technology information DB establishment. For each type of construction technology information, the level of satisfaction felt by the population for the quantity provided and the value of use according to the acquisition and utilization of information were investigated. Reliability between independent variables and dependent variables through a multiple regression analysis process to identify how the demographic characteristics of the population affect user satisfaction and the factors that affect the use value of information for each type of construction technology information. and the correlation was analyzed. The correlation between the demographic characteristics of respondents and users' satisfaction with the provided quantity was generally low, but construction experience, age, etc. were found to have an effect on satisfaction with the provided quantity. In particular, among the demographic measurement items of respondents, the more construction experience they had, the higher their satisfaction level with the quantity provided of low-level technical standards, and it was analyzed that older age had an impact on satisfaction with the quantity provided for small and medium-sized business support information.

An Analysis on the Educational Needs for the Smart Farm: Focusing on SMEs in Jeon-nam Area (중소·중견기업의 스마트팜 교육 수요 분석: 전남지역을 중심으로)

  • Hwang, Doo-hee;Park, Geum-Ju
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.1
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    • pp.649-655
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    • 2020
  • This study determined effective educational strategies by investigating and analyzing the related educational demands for SMEs (small and medium-sized enterprises) in the 4th Industrial Revolution based area of smart farms. In order to derive the approprate educational strategies, Importance-Performance Analysis (IPA) and Borich's Needs Assessment Model were conducted based on the smart farm technological field. As a result, the education demand survey showed high demand for production systems and intelligent farm machinery. In detail, Borich's analysis showed the need for pest prevention and diagnosis technology (8.03), network and analysis SW linkage technology (7.83), and intelligent farm worker-agricultural power system-electric energy hybrid technology (7.43). In contrast, smart plant factories (4.09), lighting technology for growth control (4.46) and structure construction technology (4.62) showed low demands. Based on this, the IPA portfolio shows that the network and analysis SW linkage technology and the CAN-based complex center are urgently needed. However, the technology that has already been developed, such as smart factory platform development, growth control lighting technology and structure construction technology, was oversized. Based on these results, it is possible to strategically suggest the customized training programs for industrial sectors of SMEs that reflect the needs for efficiently operating smart farms. This study also provides effective ways to operate the relevant training programs.

Development of Impact Factor Response Spectrum with Tri-Axle Moving Loads and Investigation of Response Factor of Middle-Small Size-RC Slab Aged Bridges (3축 이동하중을 고려한 충격계수 응답스펙트럼 개발 및 중소규모 RC 슬래브 노후교량 응답계수 분석)

  • Kim, Taehyeon;Hong, Sanghyun;Park, Kyung-Hoon;Roh, Hwasung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.23 no.2
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    • pp.67-74
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    • 2019
  • In this paper the response factor is investigated for middle and small size-RC slab aged bridges. The response factor consists of static and dynamic response factors and is a main parameter in the frequency based-bridge load carrying capacity prediction model. Static and dynamic response factors are determined based on the frequency variation and the impact factor variation respectively between current and previous (or design) states of bridges. Here, the impact factor variation is figured out using the impact factor response spectrum which provides the impact factor according to the natural frequency of bridges. In this study, four actual RC slab bridges aged over 30 years after construction are considered and their span length is 12m. The dynamic loading test in field using a dump truck and eigenvalue analysis with FE models are conducted to identify the current and previous (or design) state-natural frequencies of the bridges, respectively. For more realistic considerations in the moving loading situation, the impact factor response spectrum is developed based on tri-axle moving loads representing the dump truck load distribution and various supporting conditions such as simply supported and both ends fixed conditions. From the results, the response factor is widely ranged from 0.21to 0.91, showing that the static response factor contributes significantly on the results while the dynamic response factor has a small effect on the result. Compared to the results obtained from the impact factor response spectrum based on the single axle-simply supported condition, the maximum percentage difference of the response factors is below 3.2% only.