• Title/Summary/Keyword: dismantling work

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Applicability of abrasive waterjet cutting to irradiated graphite decommissioning

  • Francesco Perotti ;Eros Mossini ;Elena Macerata;Massimiliano Annoni ;Michele Monno
    • Nuclear Engineering and Technology
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    • v.55 no.7
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    • pp.2356-2365
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    • 2023
  • Characterization, dismantling and pre-disposal management of irradiated graphite (i-graphite) have an important role in safe decommissioning of several nuclear facilities which used this material as moderator and reflector. In addition to common radiation protection issues, easily volatizing long-lived radionuclides and stored Wigner energy could be released during imprudent retrieval and processing of i-graphite. With this regard, among all cutting technologies, abrasive waterjet (AWJ) can successfully achieve all of the thermo-mechanical and radiation protection objectives. In this work, factorial experiments were designed and systematically conducted to characterize the AWJ processing parameters and the machining capability. Moreover, the limitation of dust production and secondary waste generation has been addressed since they are important aspects for radiation protection and radioactive waste management. The promising results obtained on non-irradiated nuclear graphite blocks demonstrate the applicability of AWJ as a valid technology for optimizing the retrieval, storage, and disposal of such radioactive waste. These activities would benefit from the points of view of safety, management, and costs.

Development of the Selection of Optimal Conceptual Design for the Noise-reduced Aluminum System Form

  • Hong, Jong Hyun;Yeom, Dong Jun;Seo, Jung Hoon;Kim, Young Suk
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.708-709
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    • 2015
  • In Korea, a series of noise-reduced aluminum forms are being recently used in apartment housing construction. However, their complicated and time-consuming work processes, and the noise which is still generated due to the inherent property of aluminum when especially installing and dismantling them are have been pointed out as a problem to be certainly solved for increasing their practical use in construction sites. The primary objectives of this study are to propose a conceptual design of a newly designed noise-reduced aluminum form in which the noise can be enormously decreased during form works. The conceptual design in this study improved problems of conventional system aluminum forms, and, later, a system aluminum form developed based on this conceptual design will be able to ensure noise-reduction and safety as well as excellent applicability.

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Development of Risk Breakdown Structure of Nuclear Power Plant Decommissioning Project: Focusing on Structural Damage / Work Process Risks (원전 차폐 콘크리트 구조물 제염해체공사 리스크 분류체계 구축: 구조적 / 작업 리스크를 중심으로)

  • Kim, Byeol;Lee, Joo-Sung;Ahn, Yong-Han
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.3
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    • pp.38-45
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    • 2018
  • The purpose of this study is to deduct the structural damage / work process risks factors which can be occurred during the decommissioning in the NPP containment concrete structure. To achieve these purpose, risk profile specified in the construction industry is analyzed, and the work process of NPP decommissioning and the construction project were matched based on the similarity of each works. Accordingly, human and physical risk factors are classified. Finally, the risk associated with the building structure and work process was classified as per their process activities, and risk typology explaining the disaster which put the structure, equipments, machine and workers in serious danger was developed.

Opening and Closure Body Space Expressed in the Fashion Art

  • Huh Jung-Sun;Geum Key-Sook
    • International Journal of Costume and Fashion
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    • v.5 no.1
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    • pp.14-25
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    • 2005
  • The objective of this study is to understand bodily extension and identity in contemporary fashion art through the analysis of 'the fashion acting on the body' among the fashion theory excluding body and the conspicuous works on the opening and covering images as a fashion art as a body-space'. This study also investigated identity problems where there are poles apart in opening and closure their bodies and body-space in which its clothing types were distorted by being de-bodilization out of the traditional and ideological expression method in contemporary fashion art from a opening and closure point of view. Image of opening and closure among body-space in fashion art can be classified into opposing structure of opening and closure. Destroying the boundary between bodily opening and closure for a primary function of clothing and dismantling the role and boundary between body and clothing, opening body-space in appearance as a reemergence of body image or the border between inner and outer are being ambiguous because of transparent material. Being representative work of this study opening body-space was expressed as an opening space image using transparency. On the contrary, closure body-space was isolated from external environment and confined in the certain space, which could limit or restraint body- action. Excluding boundary of body and clothing on the whole or in part, boundary of work becomes body-space. However, these were appeared to be a work inducing unlimited curiosity and meaning from the audience. The interpretation of artistic and body-space in fashion art are indicating the role and function of the fashion art exceeding the suggestible dimensions in the every day life of fashion. The body-space of fashion art showing similar aspect of body art today could be understood that it is substituted into an metaphorical, critical space by seeing it as a symbol system connected with social space. Therefore, contemporary fashion art should be interpreted as an equivocal space looking at the body-space with open mind.

Expressive Characteristics of Subversive Appropriation in Kim kwang soo's Architectural Design (김광수 건축디자인의 전복적 전유 표현특성)

  • Park, Young-Tae
    • Korean Institute of Interior Design Journal
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    • v.27 no.1
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    • pp.97-108
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    • 2018
  • This study is based on the way Kim Kwang Soo works, which reveals a strong expressive tone that is rare in Korean architecture. His work is not decorative and symbolic representation of the intention of positive amusement. Therefore, the following noteworthy points will arise. The various phenomena associated with architecture and society are researched and analyzed in a critical manner. So, it creates and expresses its own formal logic. In this study, the theory of the subversive appropriation theory was identified by using the expressive characteristics of engagement. The study was based on a conceptual framework for the overturning of the mimesis, which Benjamin and Adorno have described. From this, this study summarizes Kim Kwang Soo's nihilistic attitude, finding boundaries and crack points, and subversive expression as a new form of architectural formal logic as main characteristics of interpretation of works. The characteristics of subversive expression of Kim Kwang Soo architecture derived from this are as follows. It does not take an ideological approach to the dismantling of the internalization of traditional Korean architecture. Popular culture and social phenomena are used as materials for expression. These are structured sensibly with appropriated formal logic. Finally, the architectural position adhered to the limit of performativity was recognized as the dimension of new meaning generation.

Worker Safety in the Rare Earth Elements Recycling Process From the Review of Toxicity and Issues

  • Shin, Seo-Ho;Kim, Hyun-Ock;Rim, Kyung-Taek
    • Safety and Health at Work
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    • v.10 no.4
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    • pp.409-419
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    • 2019
  • Although the rare earth elements (REEs) recycling industry is expected to increase worldwide in hightech industry, regulations for worker safety have yet to be established. This study was conducted to understand the potential hazard/risk of REE recycling and to support the establishment of regulations or standards. We review the extensive literature on the toxicology, occupational safety, and health issues, and epidemiological surveys related to the REEs, and propose suitable management measures. REE recycling has four key steps such as collection, dismantling, separation, and processing. In these processes, hazardous substances, such as REEs-containing dust, metals, and chemicals, were used or occurred, including the risk of ignition and explosion, and the workers can be easily exposed to them. In addition, skin irritation and toxicities for respiratory, nervous, and cardiovascular systems with the liver toxicity were reported; however, more supplementary data are needed, owing to incompleteness. Therefore, monitoring systems concerning health, environmental impacts, and safety need to be established, based on additional research studies. It is also necessary to develop innovative and environment-friendly recycling technologies, analytical methods, and biomarkers with government support. Through these efforts, the occupational safety and health status will be improved, along with the establishment of advanced REE recycling industry.

A study on the operation method of safety device of rotating quick coupler (회전 퀵커플러 안전장치 동작방법 연구)

  • Song, Jong-Won;Song, Chil-Sung
    • Design & Manufacturing
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    • v.15 no.1
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    • pp.8-13
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    • 2021
  • Excavators are construction machines used for digging soil, transporting soil, dismantling buildings and clearing the ground at construction sites. There are various attachments attached to the arm end of the excavator and used for various operations. There are the most common types of buckets attached for excavation and other types of attachments used for foresting, road cleaning, snow removal, and waste disposal. When multiple types of work are done at the same time, several attachments must be replaced and a device called a quick coupler is used to reduce replacement time. Although a quick coupler reduces the replacement time of the Attachment, it is necessary to attach safety devices to prevent unintentional detachment of attached attachments during the operation. To prevent the attachment from leaving or falling regardless of the operator's intention, support is installed in the hook of the bucket pin and controlled through a separate hydraulic cylinder to ensure safety. When attaching an attachment, it shall be attached without any action. This study is intended to verify the design validity of safety devices to prevent falls of attachments occurring at construction sites.

A Study on the Body Image in Surrealistic Art Characteristics - Centering on William Forsyth's Choreography (초현실주의 예술 특성에서 나타나는 신체이미지 연구 - 윌리엄 포사이드의 안무방법을 중심으로)

  • Yoo, Min-Hee;Choe, Sang-Cheul
    • The Journal of the Korea Contents Association
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    • v.22 no.8
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    • pp.227-234
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    • 2022
  • This study identified the characteristics of surrealistic art and examined the choreography method based on the representative work of choreographer William Forsythe. Forsyth developed into a ground breaking performing art through surrealistic characteristics and his own method, and sought to find a new body image based on this original choreographic approach. Through this, it was found that the destruction and dismantling of forms, which are surrealistic art characteristics, appeared as separate movements, space reconstruction, and special objects in the choreography method of Forsythe. Therefore, the purpose of this paper is to investigate the characteristics and forms of surrealism and to identify the surrealistic elements that appear in William Forsythe's.

Study on the meaning of Edi-curation in Trans-media era - Based on the comic(webtoon) and publishing content - (트랜스미디어 시대에서 에디큐레이션의 의미에 대한 연구 - 출판 및 만화 콘텐츠를 중심으로 -)

  • Park, Se-Hyeon
    • Cartoon and Animation Studies
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    • s.44
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    • pp.235-261
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    • 2016
  • Media consumers in the context of the Internet and digital media are using the same content to a variety of platforms. As such, the content of various genres is converted to the form of a new content through the process of fusion, combination, transformation, differentiation, reproduction, etc on the basis of digital media. That is referred to as trans-media. In order to create the successful content in trans-media era, it requires the work of Edi-curation. Edi-curation work is the act of editing and adding meaning to the curation work of curators. In that sense, this paper analyzed the definition and meaning for Edi-curation of publishing and comic(webtoon) content in trans-media era. Edi-curation process induces the changing role of consumers and producers of content in the digital media experience. In process of Edi-curation, consumers(producers) will soon lead to a media producer(consumer), namely proconsumer / produser. Diversification of digital platforms and devices, digital 1 person (or SNS) appeared in the media, etc. are also required to Edi-curation of content and comic(webtoon) published in a variety of ways. Depending on the intention of media producers (or consumers), content through the process of replication, montage, disassembly, dismantling, hypertext, compression, and reconstruction births to new content. The work of Edi-curation has the significance that it affects the way the media producers work in creative process, as well as the reading content of the media consumers. In the publishing content, Edi-curation work is the logicality destruction of a chapter or a paragraph, a sentence of colloquialisms, card news, the deformation of the utilization of video and media content. Meanwhile in the comic(webtoon) content, we mention the destruction of cut(frame), the various modifications of speech bubbles, onomatopoeia, and mimetic word.

Feasibility Analysis for Introduction of Scaffolding with Advanced Guardrail System to Prevent Falls (비계작업의 추락재해예방을 위한 선행 안전난간 공법의 도입 타당성 분석)

  • Park, J.D.;Moon, S.O.;Lee, H.S.;Jeong, S.C.;Kwon, Y.J.;Jung, K.
    • Journal of the Korean Society of Safety
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    • v.35 no.4
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    • pp.23-31
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    • 2020
  • In the construction sector, there were 99 fatalities from falls associated with steel tube and system scaffolds for three years from 2016 to 2018 and out of which 27.3 percent (27 workers) were found to have occurred during installing and dismantling procedure. To erect scaffolding which is installed for the work at height, the work platforms are generally installed first and the safety guardrails are installed and vice versa to dismantle. As a result, workers are exposed to the risk of falling because they erect and dismantle scaffolding without guardrails. To minimize the risk of falling, it is necessary to study a new construction method that can erect or dismantle scaffolding while guardrails are installed (called advanced guardrail system). This study analyzed advanced guardrail system in terms of safety regulation, workability and economic efficiency by investigating the domestic situation on the use of scaffolding, reviewing domestic and foreign standards for guardrails and conducting economic feasibility study. The results of this study is expected to greatly contribute to preventing falls in scaffolding installation and dismantlement procedure. As a follow-up study, empirical research is required including physical test of scaffolding with advanced guardrail system and effectiveness analysis after trial applications.