• 제목/요약/키워드: Protective Material

검색결과 460건 처리시간 0.03초

차수재(HDPE) 보호재로서 지오신세틱스의 천공에 대한 효과

  • 이광열;정진교;안용수;구태곤
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2003년도 추계학술발표회
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    • pp.64-68
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    • 2003
  • The purpose of the study is to compare the efficiency of protection as a liner protective material for geosynthetics. A series of tests were conducted in this study to analyze the effects of geosynthetics against puncture loads. Various types of geosynthetics are used as a protective material. Non-woven, Geo-composite, NaBento GCL, GCL are used to create puncture failure that caused by vertically applied loads. The results indicated that combination of geosynthetics and a protective material can be subjected to bigger loads than geosynthetics and a protective material separated each other do.

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Characteristics of Hybrid Protective Materials with CNT Sheet According to Binder Type

  • Jihyun Kwon;Euisang Yoo
    • Elastomers and Composites
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    • 제57권4호
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    • pp.197-204
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    • 2022
  • Recently, the demand has increased for protective clothing materials capable of shielding the wearer from bullets, fragment bullets, knives, and swords. It is therefore necessary to develop light and soft protective clothing materials with excellent wearability and mobility. To this end, research is being conducted on hybrid design methods for various highly functional materials, such as carbon nanotube (CNT) sheets, which are well known for their low weight and excellent strength. In this study, a hybrid protective material using CNT sheets was developed and its performance was evaluated. The material design incorporated a bonding method that used a binder for interlayer combination between the CNT sheets. Four types of binders were selected according to their characteristics and impregnated within CNT sheets, followed by further combination with aramid fabric to produce the hybrid protective material. After applying the binder, the tensile strength increased significantly, especially with the phenoxy binder, which has rigid characteristics. However, as the molecular weight of the phenoxy binder increased, the adhesive force and strength decreased. On the other hand, when a 25% lightweight-design and high-molecular-weight phenoxy binder were applied, the backface signature (BFS) decreased by 6.2 mm. When the CNT sheet was placed in the middle of the aramid fabric, the BFS was the lowest. In a stab resistance test, the penetration depth was the largest when the CNT sheet was in the middle layer. As the binder was applied, the stab resistance improvement against the P1 blade was most effective.

155mm 포탄 및 C-4 90kg 기폭에 의한 야전구축 방호자재 및 구조체용 신방호자재의 방호성능 평가 (Evaluation of Protective Performance of Protection Materials for Field and Structural Body by Ignition of 155mm Artillery Shell and C-4 Explosive)

  • 이인철;김홍섭;남정수;김석봉;홍원희;김규용
    • 한국군사과학기술학회지
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    • 제16권4호
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    • pp.493-500
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    • 2013
  • In this study, it was evaluated the protective performance of the protection material for filed of the army by impact of fragment from the explosion of 155mm artillery shell to propose the improvement items. And it was evaluated the protection materials for structural boby such as corrugated steel plate, concrete block, prevention paint of explosion, aluminum foam and concrete T-wall by impact of fragment of 155mm artillery shells and explosion-induced pressure of C-4 explosive. As a result, protective performance of the existing protective material was superior but reinforcement is necessary for secondary damage because sand is leaking. The protective performance of new protective materials was greater than existing protective materials. And it can be used for protective materials.

Study of MgSrO and MgCaO thin films as protective layers for PDPs

  • Matulevich, Y.T;Moon, Sung-Hwan;Choi, Jong-Seo;Zang, Dong-Sik
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.181-183
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    • 2009
  • Comparative study of the dependence of the firing voltage of MgSrO and MgCaO protective layers on chemical composition was carried out. It was observed that the firing voltage increases when CaO/MgO or SrO/MgO ratio increases.

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Analysis of materials for protective layers in AC PDPs.

  • Matulevich, Y. T.;Lee, Min-Suk;Kim, Suk-Ki;Choi, Jong-Seo;Zang, Dong-Sik;Kirm, Marco
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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    • pp.213-215
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    • 2007
  • To clarify processes responsible for improved characteristics of protective layers (e.g. SrCaO) the ion-induced electron emission and photoemission from these layers were analyzed. Additionally, a study of ternary Mg-, Ca-, Ba-based compounds as candidate materials for a protective layer of Plasma Display Panels has been performed as well.

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보호복 관련 국내·외 표준에 대한 탐색적 조사 - ISO, ASTM, CEN, KS를 중심으로 - (An Exploratory Study on Domestic and International Protective Clothing Standard - Focused on ISO, ASTM, CEN, KS -)

  • 한설아;남윤자
    • 한국의류산업학회지
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    • 제10권1호
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    • pp.92-100
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    • 2008
  • When designing protective clothing, there are something to be considered such as physiological feature of human body, acting range not to restrict physical activity, and effectiveness of material. Because the primary objective of protective clothing is to protect human body from danger and it is designed through complex designing process not likely general clothing design. However, current evaluation techniques-such as the ISO, the ASTM and the CEN, and KS-provide only the standard to evaluate the primary feature of material (testing, performance requirements, material specification, selection and application, test and care, and so on). There are no standard to evaluate influence for the human body while protective clothing put on. Especially, in Korea, there is KS to evaluate protective clothing, but it is partially translated version from ISO because of lack of core technology about this field. However, developed countries recognize it is new competitive means in the time of Global Standards and they are competing to make their own standard to global standard for the protective clothing. Therefore, it can be great opportunity for Korean clothing and textile industry to revitalize if focusing on research and development for protective clothing design based on physical activity of human body, fit evaluation technique and sizing which is currently no global standard for it and developing our standard to global standard.

서지보호소자의 설치방식에 따른 기기의 뇌보호효과 검토 (Study On The Protective Effect of Lightning Surge for Electronic Equipments According to Installation Methods of Surge Protective Device)

  • 이석우;황규현;서호준;이동희
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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    • pp.616-619
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    • 2004
  • Lightning surge damages of low voltage equipments in building are increasing due to increase in electrical and communication networks in the information-oriented society. And electronic equipments contained electrical circuits with semiconductor are very weak against lightning surge. The surge protective devices for electronic circuit in electronic equipments and AC power lines are becoming more widely. To achieve effective method of surge protection, there are needs for correlation between lightning surge protective effect of electronic equipment and installation method of surge protective device. This paper describes as a result of experiments for correlation between lightning surge protective effect and installation method of surge protective device.

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보호복 상의 베이스 패턴 개발 - 여경보호복을 중심으로 - (Base Pattern Development of Protective Clothing - Focusing on Protective Clothing for Riot Policewomen -)

  • 김효숙;김지현
    • 한국의상디자인학회지
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    • 제17권3호
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    • pp.207-224
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    • 2015
  • Protective clothing for riot policewomen is worn by policewomen to protect their body at suppressing a riot. Plastic guards of Nylon 66 material are attached to the base of E.V.A. Foam material. Protective clothing for riot policewomen consists of a jacket, guards for arms and legs, upper arm braces, and thigh pads. This study was aimed to develop the base pattern of the jacket to protect the torso and to improve the body suitability and the adaptability to movements of protective clothing for riot policewomen. Since current protective clothing worn by riot policewomen is manufactured with the same design of protective clothing for riot policemen, the body suitability and the adaptability to movements are not very satisfactory for policewomen who has different body structure than from riot policemen. Therefore, the purpose of this study is to reflect the body size and characteristics of riot policewomen and develop the base pattern of protective clothing with better body suitability and adaptability to movements. In this respect, amount and place of dots on the jacket were differently designed, made and evaluated by fitting test. The base with the best evaluation was selected as the final experiment clothing to demonstrate its superiority compared with the existing protective clothing.

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복합재항공기 연료시스템의 낙뢰보호설계 및 인증 연구 (Research on Aircraft Lightning Protection Design and Certification of Fuel System in Composite Material)

  • 이영제;조원일;전정환;고진환
    • 한국항공운항학회지
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    • 제25권4호
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    • pp.130-140
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    • 2017
  • Lightning protective design of an aircraft fuel system is closely related to the safety of the flight. Recently, composite material in building an aircraft becomes more important because it can reduce the weight of the aircraft. The composite materials decrease the protection against the effect of lightning. Lightning protective design of metal material aircraft has been researched for a long time and the design technique has been announced widely. However, research on the lightning protective design using composite material aircraft is very limited. In this study, lightning protective design for fuel tank structural component, access cover, fuel filler cap and drain valve in carbon fiber composite material aircraft have been presented. To show the compliance with FAA airworthiness standard regarding the presented protection designs, three steps, including lightning strike analysis, lightning environment analysis and certification test, were conducted in accordance with FAA AC 20-53.

나노실버 투명전도소재 보호필름의 개발 및 공정 최적화와 실험 계획법을 이용한 검증 (Commercialization & Process Optimization of Protective Film on Nano Silver Transparent Conductive Substrate by Means of Large Scale Roll-to-Roll Coating and Experimental Design)

  • 박광민;이지훈
    • 한국전기전자재료학회논문지
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    • 제28권12호
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    • pp.813-820
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    • 2015
  • We have studied commercialization and process optimization of protective film on transparent conductive coated substrate, nano silver on flexible PET (poly ethylene terephthalate), by means of roll-to-roll micro-gravure coater. Nanosilver on flexible PET substrate is potential materials to replace ITO (indium tin oxide). Protective film is most important to maintain unique silver pattern on top of transparent PET. PSA pressure sensitive adhesives) was developed solely for nano silver on PET and protective film was successfully laminated. We have optimized all process conditions such as coating thickness, line speed and aging time & temperature via experimental design. Transparent conductive film and its protective film developed in this research are commercially available at this moment.