• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.1
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• pp.79-89
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• 2023

The inventory of many materials requires a large storage space, and the longer the storage period, the higher the potential maintenance cost. When materials are stored on a construction site, there are also concerns about safety due to the reduction of room for movement and working. On the other hand, construction sites that do not store materials have insufficient inventory, making it difficult to respond to demands such as sudden design changes. Ordering materials is then subject to delays and extra costs. Although securing an appropriate amount of inventory is important, in many cases, material management on a construction site depends on the experience of the site manager, so a reasonable material inventory management plan that reflects the construction conditions of a site is required. This study proposes an economical material management method by reflecting variables such as the status of the preceding and following activities, site size, material delivery cost, timing of an order, and quantity of orders. To this end, we set the appropriate inventory amount while adjusting related activities in the activity network, using float time for each activity, the size of the yard, and the order quantity as the main variables, and applied a genetic algorithm to this process to suggest the optimal order timing and order quantity. The material delivery cost derived from the results is set as a fitness index and the efficiency of inventory management was verified through a case application.

• Food Science and Industry
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• v.53 no.1
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• pp.33-42
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• 2020

In accordance with the recent trend of environmentally friendly agricultural policy, product registration of agricultural chitosan among the organic materials has been displayed in various forms such as soil improving agent, crop growth, and pest control. Chitin production industry is expected to bring competitiveness by producing low-quality and low-cost chitin for agriculture, rather than high-quality and high-cost for food, medical products. Since there are various soil microorganisms that can decompose chitin and chitosan in farm soil where crops are produced, it can be applied usefully to agricultural sites suitably for crop growth and pest control using chitin and chitosan as substrates. The purpose of this study is to compare and analyze the registration status of organic materials companies using chitin and chitosan raw materials in the organic materials information system of the NAQS, and to provide an opportunity to further expand the agricultural use of domestic chitin and chitosan.

• Korean journal of applied entomology
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• v.45 no.2 s.143
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• pp.227-234
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• 2006

For the biological control of the greenhouse whitefly, aphids, American leaf-miners, Encarsia formosa, Aphidius coiemani, Diglyphus isaea, and Dacnusa sibirica were used as biological control factors. Otherwise, many kinds of environment friendly agricultural materials were also used in the kindly environment friendly farming. For testing the toxicity of environment friendly agricultural materials against to insect parasitoids as biological control factors, 61 environment friendly agricultural materials were selected by using methods and periods with insect parasitoids in the greenhouses. Environment friendly agricultural materials were sprayed to mummies and adults of E. formosa and A. colemani, and adults of Diglyphus isaea and Dacnusa sibirica in laboratory condition. Emergence rates were checked during 12 days after spray to mummies of E. formosa and A. colemani, and survival rates were at 24 and 48 hours after viral test for adult parasitoids, with 10% sugar solution. Emergence rates of E. formosa mummies were inhibited by sprayed the fungicidal environment friendly agricultural material (FEFAM) E and the environment friendly agricultural materials contained molybdenum (EFAMMo) G as 0.4 and 2.7%, respectively. E. formosa adults were not survived in vial for 48hours after sprayed and dried with the environment friendly agricultural materials contained plant extract (EFAMPE) J and the EFAMMo C. The environment friendly agricultural materials contained microelements (EFAMMEs) B and EFAMPE H, environment friendly agricultural materials contained useful soil microorganisms (EFAMSMs) H, FEFAM A and FEFAM D were recorded low survival rates of E. formosa adults with 6.7, 13.3, 13.3, 20.0 and 20.0, respectively. In case of the spraying environment friendly agricultural materials to mummies of A. colemani there were low emergence rate from mummies to adults as around 20s % with water spraying as control. A. colemani adults were not survived in vial with EFAMMo C. EFAMPE J, EFAMPE F, EFAMPE H, EFAMSM H were recorded low survival rates under 20% as 6.7, 13.3, 13.3 and 13.3, respectively, D. isaea and D. sibirica adults were not survived in vial with EFAMPE J. EFAMMo C was 53.3% of survival rates in 48 hours vial tests. D. isaea and D. sibirica were not affected by environment friendly agricultural materials compared with E. formosa and A. colemani.

• Cement
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• s.173
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• pp.41-45
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• 2006

본고에서는 먼저 재개발사업, 최저가낙찰제 확대, 임대형민간투자사업(BTL), 대규모 개발사업 등 2006년 건설산업 및 건설경기에 영향을 미친 주요변수들의 움직임을 중심으로 건설동향을 파악하였다. 그리고 각각의 변수들이 2007년에는 어떤 모습으로 전개될 것인지를 중심으로 2007년 건설경기를 전망하였다. 아울러 2006년 시멘트를 비롯한 주요 건설자재의 동향과 더불어 2007년 예상되는 국내 건설경기가 시멘트업계에 미칠 영향에 대해서 개괄적으로 살펴보았다.

• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.164-164
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• 2011

최근들어 교량 건설 프로젝트는 그 규모가 방대해 졌을 뿐만아니라, 건설에 사용되는 장비 및 자재, 인력의 종류 또한 다양해 지고 있다. 이에 따라 종래 구조적 안전만을 추구하던 건설현장은 이러한 제반 요소들을 효율적으로 관리하여 경제성뿐만 아니라 시공의 효율성 까지 고려할 수밖에 없게 되었다. 따라서 건설 현장의 진도 및 자재, 인력관리는 현대 건설 산업의 주요 과제라 할 수 있다. 이에 따라 본 연구에서는 현장의 시공정보를 무선으로 송신할 수 있는 단말기 및 RFID를 이용하여 종래에 시행되던 작업을 자동화함으로써 작업의 편리성을 도모하고 이를 통하여 시간과 인력의 낭비를 줄일 수 있는 시공관리 시스템에 대한 모듈을 제안 하였다. 제안된 시스템은 3D모델을 기반으로 하여 진도 및 공비를 한눈에 알아볼 수 있는 방안을 제시한다. 사용자는 현재 진행되고 있는 공정을 3차원 모델에서 확인할 수 있으며, 현재까지 사용된 비용 및 공정률을 손쉽게 확인할 수 있다. 3D모델은 공사 시작 전 공정에 맞추어 분절된 형태로 제작되어 현장에서 송신한 위치정보가 통합관리 시스템에서 수신되면 해당 새그가 화면에 나타나게 된다. 3D모델은 공정시각화의 역할을 할 뿐만 아니라 각 새그에는 사용된 자재의 종류나 수량등이 DB화 되어 있어, 실시간으로 공사에 사용된 물량을 산출 할수 있도록 한다. 시공정보의 수신은 각 자재에 부착한 RFID태그를 직접 읽어서 송신하거나, 작업자가 시공상황을 단말기를 통하여 직점 송신함으로써 이루어지게 된다. 수집된 시공정보는 3D모델과 연계됨과 동시에 통합관리 시스템에 내장된 DB와 연결되어 사용 자재 및 물량에 대한 비용산출에 중요한 역할을 하게 된다. 현재 우리나라의 교량 시공 현장에서는 기성청구시 내역서를 기준으로 비용을 산정하게 되는데, 시공관리 통합 프로그램에서는 각 공정이 DB화된 내역서와 연계되어 3D모델에서 얻어진 물량으로 공비를 산출하는 과정이 자동으로 이루어지게 된다. 이러한 과정은 단일 현장뿐만 아니라, 공구 내의 여러 교량 현장에 대하여도 적용이 가능하므로, 방대한 현장의 공사관리에 소요되던 시간과 노력을 절감 할 수 있다. 본 연구를 통하여 현장에서 이루어지는 공사관리 작업에 대해 IT기술을 접목하여 자동화 할 수 있는 방법에 대한 알고리즘을 제시하였다. 이는 모바일 오피스 및 단말기를 이용하여 현 공정까지 사용된 물량, 인력, 장비 정보를 관리하는 한편, 현재까지 진행된 공사 내용을 3D모델을 통하여 한눈에 알아볼수 있는 교량 건설현장 통합관리 시스템의 모듈을 제공한다. 이에따라 공무 작업에 소모되는 인력 및 시간을 크게 절약 할 수 있을 것이라 판단된다.

• Korean Journal of Construction Engineering and Management
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• v.12 no.1
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• pp.33-42
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• 2011

Part of material and inventory management is one of important factor for business interests. But importance of material and inventory management in domestic construction project has been relatively devalued. The existing study of inventory has been studied with limited individual factor about inventory management. Therefore construction material management needs improvement via an accurate prediction with whole and systematic process viewpoint. and existing theory of material and inventory introduction to construction from manufacturing needs reflecting characteristics about construction project. This paper suggests material management process for economic material management. This paper to make a unit curtain wall of case construction project comparison between total cost of existing material management process and total cost of economic order quantity of proposal material management process To verify usefulness of order point and order quantity determination process.

• Journal of the Korean Institute of Gas
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• v.26 no.4
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• pp.18-26
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• 2022

The Korean government is conducting heat-using equipment(industrial boiler) inspection in accordance with the Energy Use Rationalization Act because of the heat-using equipment(industrial boiler)'s risks such as explosion and fire, and safe use and management. This paper aimed to setup the safe and performance vulnerabilities from database based on the inspection results for heat-using equipment(industrial boiler). This study surveyed the inspection results of 1,249 heat-using equipment(industrial boiler) which were failed inspection of heat-using equipment(industrial boiler) from january 2016 to december 2020. And the analysis method is to inform safety and performance vulnerability categories of heat-using equipment(industrial boiler) by statistically analyzing the failure reasons of boiler type and inspection type which are high variance in failure rate. The safety and performance vulnerability categories was abbreviated into 18 cases. And each catagory's main reason for failure was suggested by additional analyzing the opinions of inspectors. This paper would be the basic source and the comprehensive information dealing with the safety and performance vulnerability of heat-using equipment(industrial boiler).

• Journal of the Korea Concrete Institute
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• v.22 no.6
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• pp.787-796
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• 2010

The main reason of the earth global warming is $CO_2$ and the regulation about it in the whole world has been reinforced to reduce $CO_2$ emission. It is needed that we should reduce it in the process at the production of concrete generated much of $CO_2$ emission as the primary material of construction industry recognized unfriendly environment industry. Based on a concrete, this study was constructed the system to evaluate $CO_2$ emission generated in the stage of material production, transportation, manufacture and developed the program to reduce and evaluate it efficiently. As a result, most of $CO_2$ emission is generated in the stage of material and it is quantitatively evaluated $CO_2$ emission generated in the stage of materials, transportation and manufacture. Moreover, the evaluation system of the volume of $CO_2$ emission which has the friendly environment technology about reduction of $CO_2$ emission at each stage is suggested for quantitatively evaluation $CO_2$ emission generated in the process at the production of concrete and remicon production company could use it to evaluation $CO_2$ emission.

• 주택과사람들
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• s.224
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• pp.64-67
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• 2008

토지와 건축 자재를 다루며 건축 공사를 하는 건설 회사가 예뻐졌다. 집과 건물에 색과 디자인을 입히고 앞선 트렌드를 추구하면 색다른 건축물을 탄생시킨다. 바로 40년간 주택 토목 건축 등 건설 전 분야에서 풍부한 경험과 우수한 시공력을 갖춘 금호건설이다. 변화하는 주택 시장을 리드하는 금호건설의 비전과 주요 프로젝트에 대해 알아보았다.

• Magazine of RCR
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• v.9 no.4
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• pp.29-32
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• 2014