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환기횟수 및 환기시간에 따른 교육연구시설 라돈 수치변화 평가
신윤석,안재승,김성빈,박민영 한국재난정보학회 2023 한국재난정보학회 학술대회 Vol.2023 No.11
최근 환경에 대한 관심이 지속적으로 증가함에 따라 실내 공기질에 대한 관심 역시 증폭되었다. 이에 따라 실내 공기질을 결정 짓고 흡연에 이어 폐암 사망률이 높은 라돈에 대한 관심 역시 증가하였다. 따라서 본 연구에서는 실내 라돈가스의 농도를 낮추기 위한 방법을 찾기 위해 RADON EYE RD200을 이용하여 교육연구시설에서의 세 강의동을 대상으로 라돈 방출량을 측정하고, 환기를 통해 라돈의 감소량을 측정한다. 세 강의동 모두 현재 기준치인 148Bq/㎥을 초과하는 수치를 기록하였고, 강의실을 10 분간 환기한 결과 1회 환기 시 평균 77Bq/㎥만큼 감소하였고, 2회 환기 시 평균 56Bq/㎥만큼 감소하였다. 본 연구를 통해 라돈 의 실태 및 위험성을 인지하고 라돈에 관련된 시설물 지침 및 환기를 강조하는 방안에 대한 마련이 필요하다고 판단된다.
양중작업 자동화를 위한 부재진동에 따른 타워크레인의 작업가능 기준 연구
신윤석,조훈희,안성훈,강경인,진일권 한국건설관리학회 2008 한국건설관리학회 논문집 Vol.9 No.2
현재 건설현장에서는 인력수급의 어려움과 숙련공의 노령화의 해법으로 건설 자동화가 추진되고 있다. 특히, 건축물의 대형화 및 고층화에 따라 양중작업의 중요성이 높아지면서 작업의 효율성을 향상시킬 수 있도록 타워크레인을 대상으로 한 많은 자동화연구가 진행 중이다. 타워크레인을 이용한 양중작업의 자동화를 위해서는 부재의 관성과 풍하중에 의한 진동을 제어해야 하는데, 제어하기에 앞서 진동을 예측하는 것은 매우 어렵다. 따라서 본 연구에서는 타워크레인과 부재를 대상으로 동적 모델링을 실시하고 시뮬레이션을 통해 부재의 동적 진동을 분석하였다. 그 결과, 작업조건에 따른 발생하는 부재의 최대진동폭과 특징을 분석하였다. 그리고 분석자료를 바탕으로 부재의 특성에 따라 양중작업 자동화가 가능한 풍속기준을 판단할 수 있는 방안을 제시하였다.
One pot production of Co core/carbon shell materials and their electrocatalytic properties
신윤석,박성진 대한화학회 2024 Bulletin of the Korean Chemical Society Vol.45 No.1
The oxygen reduction reaction (ORR) is a kinetically sluggish reaction because it requires the transfer of four electrons. In this work, one‐pot process involving thermal treatment of Co(II) acetylacetonate is developed. The resulting core–shell material (Co@C‐800) consists of metallic Co cores encapsulated by carbon‐based layered shells. Morphological analysis reveals the core–shell structures, with core particles surrounded by carbon networks. Chemical characterization using various spectroscopic techniques indicates the presence of metallic Co as the major component in Co@C‐800, with minor Co species exhibiting higher oxidation states. Raman spectroscopy confirms the formation of sp2‐hybridized carbon shells. Co@C‐800 displays efficient electrocatalytic ORR performance, evidenced by high onset and half‐wave potentials. The excellent durability and stability of Co@C‐800, demonstrated through resistance to methanol poisoning and cyclic testing, suggest the potential of core–shell materials as a practical electrocatalyst. The oxygen reduction reaction (ORR) is a kinetically sluggish reaction because it requires the transfer of four electrons. In this work, one-pot process involving thermal treatment of Co(II) acetylacetonate is developed. The resulting core– shell material (Co@C-800) consists of metallic Co cores encapsulated by carbon-based layered shells. Morphological analysis reveals the core–shell structures, with core particles surrounded by carbon networks. Chemical characterization using various spectroscopic techniques indicates the presence of metallic Co as the major component in Co@C-800, with minor Co species exhibiting higher oxidation states. Raman spectroscopy confirms the formation of sp2-hybridized carbon shells. Co@C-800 displays efficient electrocatalytic ORR performance, evidenced by high onset and half-wave potentials. The excellent durability and stability of Co@C-800, demonstrated through resistance to methanol poisoning and cyclic testing, suggest the potential of core–shell materials as a practical electrocatalyst.
양중작업 자동화를 위한 부재진동에 따른 타워크레인의 작업가능 기준 연구
신윤석,진일권,안성훈,조훈희,강경인,Shin, Yoon-Seok,Jin, Il-Guan,An, Sung-Hoon,Cho, Hun-Hee,Kang, Kyung-In 한국건설관리학회 2008 건설관리 : 한국건설관리학회 학회지 Vol.9 No.2
At present, construction automation is a critical solution for the shortage of labor and the aging of skilled workers. Especially, researches for transportation automation are achieved to improve the efficiency as the construction of tall-building construction. Transportation automation needs to control the swung member by the inertia and/or the wind-force at the end of cable. However, previous to control, the presupposition of the swing is heavily difficult work because the inertia and the wind force are irregularly changable according to work condition. Therefore, in this study, dynamic modeling of crane and simulation was performed to find the characteristic of the swing. In the result, the maximum displacement of the swung material was analyzed. And, on the basis of analysis, the criteria to decide workability of automated transportation considering the material size and the wind force onsite was proposed.
Production of B-doped reduced graphene oxide using wet-process in tetrahydrofuran
신윤석,박성진 한국탄소학회 2021 Carbon Letters Vol.31 No.5
Graphene-based materials show excellent properties in various applications because of their electrical properties, large surface areas, and high tolerance for chemical modifcation. The use of wet-process is a promising way for their mass production. Heteroatom doping is one of the common methods to improve their electrical, physical, and electrochemical properties. In this work, we develop a new route for the production B-doped graphene-based materials using low-temperature wet-process, which is the reaction between graphene oxide suspensions and a BH3 adduct in tetrahydrofuran under refux. Elemental mapping images show well-dispersed B atoms along the materials. Various spectroscopic characterizations confrm the reduction of the graphene oxide and incorporation of B atoms into the carbon network as high as ~2 at%. The materials showed electrocatalytic activity for oxygen reduction reactions.
사례기반추론을 활용한 건설현장 안전사고 조기 경보 모델
신윤석,유위성 한국방재학회 2015 한국방재학회논문집 Vol.15 No.6
In these days, the accidents on construction site are continuously increasing in spite of the managerial efforts and financial investments. This trend encourage safety managers or decision makers to enhance existing approaches and to develop innovative and proactive management aids. In this study, we propose an early warning model, called the Early Warning Model (hereafter EWM), for the potential types and causes of an accident as a project is progressive, using Case-Based Reasoning technique. The EWM was tested with illustrative cases, and the results showed a few possible cases with high likelihood for a specific situation randomly selected in the construction field. It is expected that the EWM is useful for furnishing safety managers and field supervisors with warning signals during the construction and helpful for assisting them in responding preactively and minimizing the ripple effect of construction site accidents. 최근 5년간 국내 건설현장에서 발생하는 건설 안전사고는 다양한 노력과 투자에도 불구하고 점차 증가하고 있는 추세이다. 이는 건설현장 안전관리에 혁신적인 관리 및 예방 기법의 개발이 시급함을 의미한다. 따라서 본 연구에서는 데이터마이닝 기법 중 하나인 사례기반추론 기법을 이용하여 사전에 발생가능한 건설 안전사고 유형을 예측할 수 있는 안전사고 조기 경보 모델을 제안하였다. 실제 건설안전사고 사례 데이터를 이용하여 모델의 유효성을 검증해 본 결과, 임의로 선택된 테스트데이터에 대하여 매우 유사한 안전사고 유형을 조회하여 제시해주었다. 본 연구의 조기 경보 모델은 건설현장 안전관리자가 발생가능한 안전사고 유형을 예측할 수 있도록 지원하여 건설 안전사고 감소에 기여할 수 있을 것으로 기대된다.
신윤석,조훈희,강경인 한국건축시공학회 2009 한국건축시공학회지 Vol.9 No.2
Recently, maintenance of public rental housing becomes a critical issue because its expenditure possesses the majority proportion of life cycle cost. The countries, such as USA and Singapore, have introduced the approaches for advanced property management, which are cost-effective in the maintenance management. However, as maintenance management system becomes advanced, risks associated with its application are also increased. Therefore, it is needed to assess the appropriate applicability of public rental housing maintenance management considering the constrains in domestic construction industry. The main objective of this study are to investigate international cases and systems and to propose strategic introduction, which satisfies the regulations and policies for domestic public rental housing. In order to evaluate the suitability of the investigated systems, practitioners' opinions were reviewed through the questionnaire surveys using analytic hierarchy process (AHP). The surveys indicate that advanced asset management was the suitable process for managing efficiently domestic public rental housing. Moreover, the results showed each weights of considerable criteria for assessing the effective application of maintenance management, and would contribute to further detailed and systematic management.
신윤석,김대원,김태용,김광희 한국건축시공학회 2016 한국건축시공학회지 Vol.16 No.2
The daily report includes the most detailed information and various daily planning and performance data recorded ata site, and includes work types, the number of workers, and the equipment and materials used. However, in the dailyreporting process, some information can be omitted or distorted or even made redundant due to there being severalsteps of manual input. For this reason, the daily report is utilized for a simple report rather than for an appropriatepurpose. Thus, to resolve the issues of the existing daily report system mentioned above, a daily report system usinga digital pen was developed and then applied to an actual construction site to verify its applicability. As a result, itwas found that 96.610% recognition accuracy of handwritten letters could be achieved. In addition, it was no longernecessary to enter the same information multiple times and no additional training or education for using a mobiledevice was needed. The digital pen-based daily report program developed in this study is expected to contribute to animprovement of information management efficiency and site document management work by addressing the problemsof the existing report system. 작업일보는 일일 단위로 계획과 실적이 기록되는 문서로 작업내용, 출력인원, 장비 및 자재 현황 등 다양한 정보를 포함한다. 하지만 작업일보가 여러 단계를 거쳐 수기작성되는 과정에서 정보의 누락 및 왜곡될 수 있고 업무의중복 문제가 발생하여 단순 보고에 이용되고 있다. 따라서본 연구에서는 기존의 작업일보시스템의 문제를 해결할수 있는 디지털펜 기반의 작업일보시스템을 개발하고 그적용성 평가를 위해서 실제 건설 현장에 적용해보았다. 그결과 높은 문자 인식 정확도(94.610%)를 보여주었다. 그리고 정보를 입력하는 추가 업무가 제거되고 휴대 및 이동이 편리하며 사용을 위한 별도의 교육이 필요 없는 장점이있었다. 본 연구에서 개발한 시스템은 현행 작업일보시스템의 문제를 해결하여 건설현장 문서업무 및 정보관리 효율 개선에 기여할 수 있을 것으로 기대된다.