• Explosives and Blasting
• /
• v.40 no.2
• /
• pp.25-34
• /
• 2022

Recently, there has been an increasing number of cases of improving constructability by using electronic detonators with precise delay time in tunnel blasting sites. This case is a case of conducting test blasting using with non-electric detonator and electronic detonator at the site of 『Seoul Metropolitan Area Express Railroad Route A Private Investment Project Section 00』 that requires careful management of vibration and noise. Although this site was designed with a non-electric detonator, it was attempted to improve the advance rate and control vibration and noise by mixing the non-electric detonator and the electronic detonator due to the decrease in the advance rate. As a result of the blasting, the target value was achieved with an advance rate of about 85% and a maximum measured value of vibration and noise is 0.215cm/sec and 73.22dB(A) which were measured below regulatory standards. As blasting works in downtown areas, it is necessary to designate measurement and management objects to continuously manage vibration and noise.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 1991.04a
• /
• pp.53-56
• /
• 1991

산업구조의 급속한 발전과 공업화는 사회구조의 변화 및 대도시로의 인구집 중, 고밀도화, 교통량의 증가를 초래하여 이로부터 기인한 도시지역의 환경 오염 문제는 쾌적한 인간생활을 위협하는 단계에까지 이르렀다. 그중에서 소 음에 관한 문제도 대기 및 수질의 오염과 동시에 도시생활 환경에 많은 영 향을 미치게 되었다. 도시 소음의 주 원인은 주로 도로교통소음이며 이는 기 하급수적으로 늘어가는 자동차의 양에 의해 더욱 심해지고 있다. 따라서 현 재 우리나라에서도 주거지역 및 준주거지역 등의 지역별 소음도 규제 및 신 설되는 공동주택 단지에서의 소음레벨규제등이 있긴 하나 이들은 상당히 소 극적이며 미온적일 뿐 아니라 실제 거주하는 주민들의 반응과는 상당한 차 이를 보이고 있으며 더욱이 주민의 소음에 대한 주관적 반응을 적절히 표현 할 수 있는 지표마저 명확하지 않은 실정이다. 이러한 관점에서 본 고찰에서 는 피험자들의 주관적 반응을 실험할 때 발생하는 변수요인들을 통제 할 수 있는 실험 실시행 청감실험을 실시하기에 앞서 대상지역의 도로교통소음을 여러가지 평가척도에 의해 평가한 후 그 현장에서 이 소음에 노출된 피험자 들의 반응을 파악하여 청취자들이 인지하는 소음레벨을 적절히 평가하는 지 표를 찾고자 한다.

• 월간 기계설비
• /
• s.285
• /
• pp.100-102
• /
• 2014

대한설비건설협회는 지난해 7월 개정된 도시가스사업법 시행규칙 제20조의2 '특정가스사용시설' 규정과 관련 코드기준(KGS FU551 등) 등 세부기준이 건설업계와 설비시공업계에 규제 강화로 적용됨에 따라 민원이 속출하고 있어, 이를 제외 및 폐지하여 줄 것을 지난 3월 14일 산업자원통상부와 한국가스안전공사에 건의했다. 현재까지 단 한건의 가스누출사고도 없었던 매립(매몰) 배관에 대해 안전성을 강화한다는 명분으로 고가의 다기능가스안전계량기를 설치토록 하고, 추가로 한국가스안전공사의 완성검사 및 기술검토까지 받도록 하는 것은 이중규제로 지적되고 있다. 또한 점검구의 경우 천정높이와 현장여건에 따라 설치 개수도 달라지며, 설치 후 실질적인 수리 보수를 할 수 없는데다 미관상 많은 민원을 초래할 수 있어 무용지물이 될 수 있다고 업계는 지적하고 있다. 이에따라 대한설비건설협회는 ${\triangle}$건축물 내 도시가스 매립(매몰)배관 특정가스사용시설 제외 ${\triangle}$가스용 금속플렉시블배관용호스 은폐(천정) 설치 시 점검구 또는 다기능가스안전계량기 설치 의무화 Code기준의 개선을 촉구했다. 또한 지난 3월 13일 제도 홍보를 위해 개최된 '건축물내 매립배관 제도개선 현황과 과제' 세미나에서도 대한설비건설협회는 이같은 문제점을 지적하고 보완책 마련을 건의했다.

• Journal of the Korean Society for Library and Information Science
• /
• v.34 no.1
• /
• pp.243-264
• /
• 2000

It is the aim of this study to attain general knowledge of Intellectual freedom which provides the philosophical principle of our library activities. Also, this study seeks to develop the principia of intellectual freedom as the policy and guide of public libraries in Korea. In order to research the operational circumstances of intellectual freedom In our public libraries, the researcher visited 20 public libraries in the Seoul district. The results clearly confirmed the self-censorship of the librarians in selecting materials. Also, it confirmed the reality of external interventions and restrictions as well as restrictive sources originating from internal ignorance and habitual practices in our public libraries. Ultimately, such results provided a solid basis for the aim of this study to develop intellectual freedom principle as the basic ideology for public library activities in Korea.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2022.05a
• /
• pp.70-70
• /
• 2022

도시화와 산업화, 그리고 인구 증가 등은 우리사회에 기후변화라는 재앙으로 다가오고 있다. 그리고 이러한 기후변화는 기업에 영향을 미치어 경영환경의 불확실성을 높이고 있다. 즉, 기후변화는 기업이 경영함에 있어 물 공급의 부족 등과 같은 물리적 리스크를 제공하는가 하면 요구 기술의 변화, 시장의 변화 등 전환 리스크(transition risk)로 작용하여 기존 제품 및 서비스의 생존을 어렵게 하는가 하면 기업의 자산 가치에 변화를 주고 있다. 이에 본 연구는 기후변화로 인한 시장환경 변화에 글로벌 기업들이 어떻게 대응하고 있는가를 검토·시사점을 제시하였다. 기후변화가 기업에 미치는 영향은 단순히 위기로만 다가오지 않는다. 기후변화는 기업에게 물부족 등의 물리적 위험과 사회적 규제, 새로운 기술 수요 등 리스크로써 영향을 미치는 한편 탄소 시장 형성 등의 기회로도 작용하고 있다. 이에 글로벌 기업들은 위기이자 기회인 환경의 변화에 대응하여 'ESG 성과 측정'을 도입, 대응하는 사례가 증가하고 있다. 사례로는 투자기관인 골드만삭스에서 기후변화 대응을 정부규제, 이해관계자, 경쟁환경 변화 등 3가지 관점에서 대응하는가 하면 독일계 화학회사인 BASF는 기업의 사회적 가치를 ESG 요소의 관점에서 평가하여 매년 발표하고 있다. 한편 국내 기업으로는 SK그룹이 대표적인데, 동사는 사회적 가치 평가 결과를 임직원 핵심성과지표(KPI)에 반영함으로써 경영현장에서도 사회적 가치를 고려하도록 시스템화하고 있다.

• Journal of the Korean Institute of Gas
• /
• v.27 no.3
• /
• pp.91-97
• /
• 2023

Aging construction machinery and vehicles with old diesel engines usually have a long life span, so they continue to emit harmful emissions. Therefore, replacing these older diesel engines with engines that meet the latest emisstion standard is expected to help improve air quality, and engines with propane fuels, which are easily available at construction sites, can be an appropriate alternative. In this study, a propane fueled engine was developed based on a 6.8-liter CNG engine, and technologies such as gas injectors, exhaust gas recirculation (EGR), and enhanced catalysts were applied. As a result, nitrogen oxides achieved half of the emission performance at the Stage-V level, the latest emission standard, while securing diesel engine output and torque in the same class.

• Journal of the Korean Wood Science and Technology
• /
• v.44 no.5
• /
• pp.617-621
• /
• 2016

On-site survey on glue-laminated board (GLB) manufacturers of Malaysia, Indonesia, and China was conducted to identify the cause of interception of regulated pest from imported GLBs from those countries, and to suggest optimal manufacturing processes of GLB for preventing quarantine risk associated with imported GLBs. The cause of pest interception was improper manufacturing processes, such as air drying or inadequate kiln drying of green laminae, improper storage of dried laminae before finger jointing and edge gluing, and/or incomplete packing of GLBs. In particular, Paulownia GLB manufacturing processes used in China, including air drying of laminae, were mostly poor in terms of preventing quarantine risk associated with imported GLBs. From now on, for preventing quarantine risk associated with imported GLBs, importers have to ask foreign manufacturers spontaneously to use proper manufacturing processes (adequate kiln drying of green laminae, proper storage of dried laminae, and complete packaging of final GLBs).

• Explosives and Blasting
• /
• v.37 no.2
• /
• pp.22-30
• /
• 2019

On sites where explosives are used, the effects of noise and vibration produced by the blast wave are subject to a number of operational restrictions. Recently, the number of civil complaints has increased and the standard of environmental regulations on secure goods has been greatly tighten. Therefore, work is generally carried out by machine excavation in case of close proximity of safety thing. Machine excavation methods have the advantage as reducing noise and vibration compared to blasting methods, but depending on the conditions of rock intended to be excavated, they are sometimes less constructive than planned. In general, the closer a rock type is to hard rock, the less constructible it becomes. In this paper, we are going to explain the construction of a construction section with a close proximity to a safety thing using electronic detonators. While the project site was designed with a machine excavation methods due to the close(9.9m) proximity of safety thing(the railroad), construction using electronic detonators was reviewed as an alternative method for improving rate of advance time and construction efficiency when expose to hard rock. Through blasting using electronic detonators, construction and economic efficiency were maximized while minimizing impact on surrounding safety things. Because $HiTRONIC^{TM}$, which is produced by Hanwha, has innovative stability and high explosion reliability, it is able to explode with high-precision accuracy. Electronic detonators are widely used in construction sites of railway or highway, other urban burrowing areas and large limestone mines.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
• /
• v.19 no.3
• /
• pp.139-141
• /
• 2013

In respect of environmental hazard or human safety, the use of the chloride-based packaging materials like polyvinyl chloride (PVC) blister and film, Polyvinylidene chloride (PVDC) laminated film has been restricted with national regulations. In this study, I intended to develope the reagent solution for identifying the chloride-based packaging materials, so that it was made by mixing methanol ($CH_3OH$) saturated with sodium hydroxide (NaOH) and pyridine as solvent with same ratio. The efficacy of this reagent solution was verified by the analysis of chemical mechanism and experiments that showed the color change (brown) of the specimens. This analysis methode using reagent solution is so simple, convenient, inexpensive and immediate that I expect it will be useful in the field of packaging.

• Korean Journal of Construction Engineering and Management
• /
• v.8 no.4
• /
• pp.128-136
• /
• 2007

As the international-level concern has been focused on the environmental sustainability in recent years, many researches emphasized the needs for methods and techniques that would facilitate sustainability assessment at the various project level interfaces. As part of methods and techniques to facilitate sustainability assessment, this paper provides 'Computerized Waste Management Performance Evaluation Tool' for the purpose of assessing the level of management system in dealing with the onsite construction wastes. This tool applies twenty-three waste management performance factors for the purpose of evaluating the level of waste management performance by scoring those factors which were identified in the previous research. These twenty-three factors are classified into four categories: manpower, material, method, and management based on their characteristics. In order to quantitatively evaluate the effectiveness of waste management performance, the levels of actions executed in a site by each waste management performance factor were identified and their weight were analyzed throughout the expert interview and survey. Furthermore, an excel-based computerized tool was developed in order to facilitate the evaluation process. If this tool can be developed in more detail and be used as the method to control waste management at a project level for the future, it is expected that this tool can play an important role in the body of knowledge of environmental management in construction industry.