• 월간 기계설비
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• s.311
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• pp.52-60
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• 2016

21세기에 기업의 운명을 결정짓는 것은 기업문화이다. 바람직한 기업문화는 훌륭한 일터를 만들기 위한 전제조건이다. 그런 까닭에 오늘날 대부분의 기업들이 각사 특성에 적합한 바람직한 기업문화 정착에 많은 관심을 기울이고 있다. 성마기업(주)이 그렇다. 성마기업은 투명경영을 통해 임직원 모두 주인의식으로 무장하고 있으며 소통하는 기업문화를 갖고 있다. 또 매년 전직원이 모여서 교육을 실시한다. 성마기업은 지난 1월 13일 오후 1시부터 15일 오후 6시까지 인천광역시 소재 건설기술교육원에서 60여명의 전 직원이 참석한 가운데 2박 3일간 직무능력 향상 교육을 실시했다. 이 교육에 예외란 없다. 본사를 비롯, 전국에 있는 현장의 모든 직원들이 참석하여 교육을 받는다. 2박 3일간 일정 중 교육시간은 약 20~24시간이며 1인당 30만원 정도(강사교, 교재, 숙식비 포함) 비용이 든다. 이 중 1인당 10만원 정도는 고용보험료로 환급받을 수 있다. 단, 교육 내용이 업무와 연관없는 과목은 환급에서 제외된다. 본지는 지난 2월호에 게재된 '2016년 성마기업 직무능력 향상 교육'에 이어 이번호에는 성마기업이 지난해 실시한 경영컨설팅의 주요 결과에 대해 게재한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.237-237
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• 2016

전세계적으로 기후변화에 따른 가용 수자원의 부족과 물 재해가 증가하고 있으며, 이에 따른 수자원 및 물산업의 중요성이 강조되고 있다. 또한 세계 수자원 시장이 점차 확대될 것으로 전망되어 공공기관 및 국내기업은 해외 시장 진출을 위한 다양한 사업을 진행하고 있다. 해외 수자원산업의 진출을 위해서는 해당 국가의 수자원 현황파악과 수자원개발 계획에 대한 면밀한 분석이 필요하며, 물수지 영향을 검토하기 위한 타당성 조사가 요구된다. 본 연구에서는 아시아 개발도상국의 수자원개발 계획과 특성을 비교하고 물수지 분석을 위한 자료의 가용성을 평가하고자 한다. 대상지역은 아시아 개발도상국인 3개 국가(베트남, 이란, 파키스탄)를 선정하였으며, 각 국가의 수자원개발 계획의 특징을 분석하였다. 우리나라 사례와 비교하기 위해 국가수자원 장기종합계획과 국가 간 이수 및 치수부문별 계획의 차이점과 특성을 분석하였으며, 국가별 수자원계획에 활용한 수요 및 공급부문별 자료 특성을 비교하였다. 본 연구결과는 해외 수자원산업 진출을 위한 기초자료로 활용될 수 있을 것으로 기대되며, 물수지 분석 및 평가를 통해 수자원개발 가능성을 정량적으로 제시하고자 한다.

• Journal of the Korean institute of surface engineering
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• v.55 no.6
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• pp.383-389
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• 2022

Natural(outdoor) and accelerated(artificial) weathering tests were performed to investigate their influence on polycarbonate. The polycarbonate materials were prepared of various formulations divided into three batches, with existing, development materials1, development materials2, containing mixture of UV additives. Weathering tests were carried out as outdoor weathering(Seosan, South Korea) and accelerated weathering(xenon-arc), and the results analysis were evaluated based on yellow-index(YI), scanning electron microscope(SEM/EDS), energy dispersive x-ray spectroscopy(XRD), and gel permeation chromatography(GPC). Among the three materials, processing method development materials1 with UV stabilizer was excellent in weathering. This study can provide basic data for standardization of development and performance evaluation on livestock barn roof.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.217-217
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• 2020

인간 물이용 중심의 하천 관리로 하천에 인위적으로 설치되는 횡단구조물은 물의 흐름을 막아 수질환경을 악화시킬 뿐 아니라 하천의 연속성을 단절하여 생물의 이동을 차단하여 생태계에 악영향을 미친다. 이러한 인위적인 구조물로서 약 34000여개의 농업용 보와 약 16000여개로 추정되는 낙차공이 다수 존재하고 있다. 이러한 구조물은 유수에 의하여 하상으로 전달되는 유수에너지를 저감하기 위하여 다양한 형태의 하상보호공을 설치하여 하천횡단구조물을 보호하도록 되어있다. 그러나 하상보호공에 사용되는 기술 중 사석 및 돌망태와 같은 기술은 시공비용이 적고 빠른 시간에 시공 할 수 있지만 급격한 홍수에 쉽게 파괴 및 유실이 되는 단점이 있으며, 콘크리트 소재 공법은 세굴방지에 좋은 효과를 발휘하는 장점을 지니지만, 시간이 지남에 따라 마모/변형되거나 포락/유실되어 하상을 지속적으로 보호하지 못하게 되며 과도한 세굴은 구조물의 안전성에도 영향을 미친다고 할 수 있다. 최근 기후변화로 인하여 돌발호우 및 강우량의 증가로 돌변하는 하천환경에 대한 적용기술은 미비한 실정이기 때문에, 많은 연구자들은 이에 대한 해결책을 찾기 위하여 자연친화적 생태복원 기술을 개발하고 있다. 본 연구에서는 바이오폴리머를 다층다공성 하상보호기술에 대하여 에너지 저감 효율, 고유속에서 한계 소류력, 소재 이탈 실험을 최대유량 10 ㎥/s, 유속 8m/s를 재현할 수 있는 실규모 하천실험장에서 진행하여 과학적인 안전성을 확인하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.1-8
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• 2018

FRP is a new material that is light, has high strength and high durability, and is emerging as a third construction material inside and outside of countries. However, very few studies have been done on curved FRP construction materials that can be used for tunnels or arched bridges. Because a small composite panel specimen is smaller than a full-size specimen, it can be used in a variety of experiments under different conditions. Therefore, in this study, experiments were performed on a void section, a solid section, a connected solid section, and a sand-coating solid section. The results of the experiment show that the connection of composite curved panels with longitudinal connections provides almost equivalent performance to that of a single panel. However, it is necessary to strengthen the connections, since the connections that are most susceptible to damage will break first.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.44 no.2
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• pp.183-190
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• 2024

An environmentally-friendly nanocoating method that effectively adds flame retardant(FR) and gas shielding properties to combustible polymeric construction materials such as flexible polyurethane (PU) foam was studied. Naturally-driven two-dimensional(2D) nanomaterials such as graphene oxide (GO) can exhibit liquid crystalline (LC) properties in aqueous solutions, enabling uniform coatings on the various substrates including 3D-porous foams. LC phase-assisted coating serves as 3D-scaffold, facilitating the introduction of small molecules having antioxidant capabilities such as dopamine which is to form uniformly stacked FR coating. Additionally, the structural characteristics of the 2D-materials can effectively hinder the migration of toxic gases and flammable substances in the gas phase generated during combustion. This LC phase flame retardant coating technology could be a new approach to provide environmentally friendly and effective flame retardant and gas barrier properties to various types of polymeric materials.

• Journal of the Korea Concrete Institute
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• v.19 no.6
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• pp.667-676
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• 2007

As the 21st century began, cement and concrete that are representatives of modem building materials became a major factor in global warming, air pollution and environmental pollution. Also, the problems that are generated while pursuing high performance and high strength became social issues. Therefore, it has become urgent to prepare counter plans. This study has aimed at the recycling of sewage sludge ash and developing it as a new concept in building material which serves the environmental considerations for long-lasting developmental purpose. Also, the study aimed to find a substitute for scarce natural resources and to secure high techniques for waste recycling. The purpose of this study was also to solve fundamentally secondary environmental pollution. The results revealed that the chemical components of sewage sludge ash are mainly $SiO_2\;and\;Al_2O_3$ which are similar to the components of pozzolan. Also, it was identified that sewage sludge ash can be utilized as a hardened specimen with an alkali activated pozzolan reaction. Considering the possibility of appropriate strength development and the advantage of drying shrinkage, compared with that of cement, it was believed that sewage sludge ash can demonstrate a function as a substitute for cement given.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.3
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• pp.236-245
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• 2021

It is very important for structure designer to understand the service life variation since a wide range of service life is evaluated with changing exposure conditions and design parameters. Recently, for zero-carbon, waste plastic has been used for fuel for clinker production and this yields increase in chloride content in cement. This study is for evaluation of changing service life in the concrete with increasing initial chloride content due to usage of plastic-SRF(Solid Refuse Fuel) considering various exposure conditions and design parameters. For this, 4 levels of initial chloride content were assumed, and the service life was assessed using LIFE 365 program considering various environmental conditions including 3 levels of surface chloride content. As for analysis parameters, critical/initial chloride content, blast furnace slag powder replacement ratio, W/B(Water to Binder) ratio, cover depth, and unit mass for binder are adopted. Service life decreases with increasing initial chloride content and a significant reduction of service life is not evaluated permitting up to 1,000ppm of initial chloride content. With increasing slag replacement ratio, a longer service life can be secured since blast furnace slag powder has the effect of reducing the diffusion of external chloride ions and fixing the free chloride. It is thought that increasing initial chloride content up to European standard is helpful for enhancing sustainability and reducing carbon emission. Though the reduction in service life due to an increase in the initial chloride content is not significant in slag-concrete with low surface chloride content, careful consideration for mixing design should be paid for the exposure environment with high surface chloride content.

• Korean Journal of Construction Engineering and Management
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• v.21 no.5
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• pp.46-54
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• 2020

The construction industry has the most safety accidents among domestic industries. Special care must be taken because disasters in the construction industry lead to social problems caused by huge property losses and casualties. As a result of this, there is a growing awareness of disasters occurring in the construction industry, and government departments are tightening regulations on safety management. In particular, the OSHA (Occupational Safety and Health Agency) focuses on the expansion of protection targets and the clarification of responsibility in the full amendment OSHA. As a result, a study that focuses on safety management by client's responsibility is needed. In this study, the project performance capability assessment of construction project management contractors, which is being carried out with uniform assessment criteria without considering the characteristics of the construction project, is considered and all the amendments to the OSHA are considered, and the factors were derived for improvement measures.

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.1
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• pp.15-22
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• 2022

In this study, the hydration reaction and strength characteristic of cement mortar with spent coffee ground(SCG) was investigated. As a result of the study, it was found that as the firing temperature of the SCG increased, the mass loss due to the combustion of organic matter increased, but the density increased. In addition, when the SCG were mixed, SCG interfered with the hydration reaction and the compressive strength was significantly lowered. On the other hand, the coffee grounds ash(SCG_Ash) calcined at 800 ℃ showed a hydration reaction and a compressive strength equivalent to or higher than that of OPC mortar.