• 제목/요약/키워드: HPC method

검색결과 82건 처리시간 0.025초

측방충돌시 휠체어 탑승자의 위험도 분석에 의한 안전성평가 (A safety assessment by Risk Analysis Method on wheelchair occupant in side impact)

  • 김성민;김성재;강태건;전병호;김경훈;문무성;홍정화
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 추계학술대회 논문요약집
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    • pp.16-16
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    • 2003
  • In this study, for a safety assessment of wheelchair occupant in side impact, we used a dynamic sled impact test results. The test was carried out total 6 times and impact speed was 13g$\pm$0.43/28km/h$\pm$0.95, By using EURO SID-1 dummy, head performance criteria(HPC), abdominal peak force, etc. were measured. We evaluated wheelchair occupant safety by motion criteria(MC) which was measured by head, trunk and side deformation change of wheelchair and Head & Neck injury criteria(HNI) measured by using head and neck deformation angle and time relation. When we assumed that the maximum injury value in side impact was 100%, the results of motion criteria(MC) of wheelchair occupant were max 80.3, mim 32.3 and average 60.3%, Head & Neck injury criteria(HNI) value were max 118.4, min 14.5 and average 59.7%.

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상압증기양생방식에 의한 PHC PILE의 제조기술 연구 (An Experimental Study on Manufactural Technics of PHC Pile Using Low Pressure Steam Curing Method)

  • 김종흡;안상기;이동근;심흥섭
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1994년도 가을 학술발표회 논문집
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    • pp.405-414
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    • 1994
  • The High Strength Concrete REsearch Team of the Dong-Ah Construction R&D Institute has achieved the preactical use of the PHC pile manufacture technique at the Dong-Ah Chang-dong PC Plant. Components of the high strength concrete are used high strength cement, admixtures(water reducing high range admixture, micro silion fume, fly ash, gypsum). The design strength required 800kg/$\textrm{cm}^2$ was developed raging from 870kg/$\textrm{cm}^2$ to 1010kg/$\textrm{cm}^2$. The new manufacture procedure of HPC pile which include placing, molding, steam curing is able to apply a current PC pile manufacture procedure easily without using the high pressure steam curing.

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Analytical Rapid Prediction of Tsunami Run-up Heights: Application to 2010 Chilean Tsunami

  • Choi, Byung Ho;Kim, Kyeong Ok;Yuk, Jin-Hee;Kaistrenko, Victor;Pelinovsky, Efim
    • Ocean and Polar Research
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    • 제37권1호
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    • pp.1-9
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    • 2015
  • An approach based on the combined use of a 2D shallow water model and analytical 1D long wave run-up theory is proposed which facilitates the forecasting of tsunami run-up heights in a more rapid way, compared with the statistical or empirical run-up ratio method or resorting to complicated coastal inundation models. Its application is advantageous for long-term tsunami predictions based on the modeling of many prognostic tsunami scenarios. The modeling of the Chilean tsunami on February 27, 2010 has been performed, and the estimations of run-up heights are found to be in good agreement with available observations.

Sol-Gel법으로 제조된 TiO2 전극의 광전기 화학적 특성 (Photoelectrochemical Properties of TiO2 Electrode Prepared by the Sol-Gel Method)

  • 김진희;이재훈;설용건;이태희
    • 에너지공학
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    • 제3권1호
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    • pp.36-43
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    • 1994
  • 광전기화학전지의 전극으로 TiO2 반도체 전극을 선택하여, sol 용액을 dip-coating 방법으로 티타늄 금속위에 입혀 만든 TiO2 필름의 광전기화학특성을 연구하였다. Dipping 횟수와 TiO2 필름의 두께간에는 선형적인 비례관계가 나타났으며, 15회 코팅하여 얻은 5.5$\mu\textrm{m}$에서 가장 큰 광전류값을 얻을 수 있었다. 전극의 최종열처리를 50$0^{\circ}C$에서 20분간 행하였을 때 광전류값이 가장 컸고, 열처리시간을 증가시키고, 열처리 온도가 50$0^{\circ}C$ 이상이 되면 광전류는 감소하였다. 유기첨가제로 HPC를 사용한 경우 sol 용액의 점도 및 제조된 전극의 광전류값이 가장 크게 나타났다.

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모빌 디바이스의 무선데이터통신을 활용한 엑스트라넷 구축연구 (A Study on construction of extranet using wireless data communication of mobile device)

  • 유우식
    • 산업경영시스템학회지
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    • 제22권51호
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    • pp.139-149
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    • 1999
  • Developed in this paper is a prototype extranet using mobile device such as Personal Digital Assistance(PDA) or Handheld PC(HPC). Especially an adjustment transaction system for auto insurance using wireless data communications is described. Using infrastructures such as PCS, Cellular, Private Radio, wireless communications offers tremendous applications in Korea. A survey of such applications is presented in this paper. Also an analysis of currently available infrastructures of wireless communications is described in this paper. The scheme of an adjustment transaction consists of seven steps: (1) get list of adjustment, (2) obtain insurance information, (3) check police record, (4) get an accident record, (5) get bluebook value, (6) examine the car, (7) file report. Comparing with the previous on-line method that spends much time on gathering data, the proposed system guarantees more rapid transaction using wireless communications.

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분산 컴퓨팅 환경에서 효율적인 암호 키 탐색 기법 (An Efficient Key Searching Method on Distributed Computing Networks)

  • 이창호;강주성;박태훈;최장원
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2007년도 추계학술발표대회
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    • pp.1278-1281
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    • 2007
  • 초고속 인터넷망이 발달됨으로써 분산 컴퓨팅 시스템 구축이 용이해졌다. 분산 컴퓨팅 시스템은 저비용과 유휴 계산 자원의 활용으로 기존의 슈퍼컴퓨터와 유사한 능력을 발휘할 수 있다는 장점을 지닌다. 암호 알고리즘의 실질적인 안전성 요소인 키의 길이는 전수조사 계산량에 의존한다. 키 전수조사를 위한 대용량 계산은 슈퍼컴퓨터, 클러스터, 분산 컴퓨팅 등의 환경에 따라 세부적인 메커니즘에 차이를 보인다. 본 논문에서는 분산 컴퓨팅 시스템을 소개하고, 이러한 환경 하에서 암호 알고리즘의 키 전수조사 작업을 수행하기 위한 세부적인 절차에 대해서 논하고, 구체적으로 키 전수조사 작업을 효율적으로 수행하기 위한 방법을 제안한다.

Roofline-based Data Migration Methodology for Hybrid Memories

  • Jongmin Lee;Kwangho Lee;Mucheol Kim;Geunchul Park;Chan Yeol Park
    • Journal of Internet Technology
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    • 제21권3호
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    • pp.849-859
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    • 2020
  • High-performance computing (HPC) systems provide huge computational resources and large memories. The hybrid memory is a promising memory technology that contains different types of memory devices, which have different characteristics regarding access time, retention time, and capacity. However, the increasing performance and employing hybrid memories induce more complexity as well. In this paper, we propose a roofline-based data migration methodology called HyDM to effectively use hybrid memories targeting at Intel Knight Landing (KNL) processor. HyDM monitors status of applications running on a system and migrates pages of selected applications to the High Bandwidth Memory (HBM). To select appropriate applications on system runtime, we adopt the roofline performance model, a visually intuitive method. HyDM also employs a feedback mechanism to change the target application dynamically. Experimental results show that our HyDM improves over the baseline execution the execution time by up to 44%.

고성능 콘크리트를 활용한 교량 교면포장 기술 (Bridge Deck Overlay Technology Using High Performance Concrete)

  • 박해균;원종필
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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    • pp.1113-1116
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    • 2008
  • 실리카퓸, 플라이애쉬, 고로슬래등 미분말 혼화재가 포함된 고성능 콘크리트(High Performance Concrete) 교량 바닥판 보호공법은 1980년 초부터 북미를 중심으로 사용되어 왔다. 본 보고서에서는 교량 바닥판 보호를 위한 고성능 콘크리트 적용사례와 고성능 콘크리트를 이용한 두 가지 공법(고성능 콘크리트 교면포장공법, 노출 바닥판 공법)에 대해 소개한다. 위 두 공법은 이미 북미에서 많은 실적을 보유하고 있으며 특히, 실리카퓸과 PVA섬유가 포함된 고성능 콘크리트 교면포장공법은 국내에서도 성공적으로 적용되고 있다. 따라서 본고에서는 기존 아스팔트 재료를 대체할 수 있고, 최근 국내에서도 그 적용성에 대한 관심과 실 시공이 이루어지고 있는 고성능 콘크리트를 이용한 교면포장 (Overlay) 공법 및 노출 바닥판(Full depth) 공법에 대해 소개하고자 한다.

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Separation of Selenite from Inorganic Selenium Ions using TiO2 Magnetic Nanoparticles

  • Kim, Jongmin;Lim, H.B.
    • Bulletin of the Korean Chemical Society
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    • 제34권11호
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    • pp.3362-3366
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    • 2013
  • A simple and quick separation technique for selenite in natural water was developed using $TiO_2$@$SiO_2/Fe_3O_4$ nanoparticles. For the synthesis of nanoparticles, a polymer-assisted sol-gel method using hydroxypropyl cellulose (HPC) was developed to control particle dispersion in the synthetic procedure. In addition, titanium butoxide (TBT) precursor, instead of the typical titanium tetra isopropoxide, was used for the formation of the $TiO_2$ shell. The synthesized nanoparticles were used to separate selenite ($Se^{4+}$) in the presence of $Se^{6+}$ or selenium anions for the photocatalytic reduction to $Se^0$ atom on the $TiO_2$ shell, followed by magnetic separation using $Fe_3O_4$ nanoparticles. The reduction efficiency of the photocatalytic reaction was 81.4% at a UV power of 6W for 3 h with a dark adsorption of 17.5% to the nanoparticles, as determined by inductively coupled plasma-mass spectrometry (ICP-MS). The developed separation method can be used for the speciation and preconcentration of selenium cations in environmental and biological analysis.

대추과육과 대추잎 혼합발효추출물이 고지방식이로 유발된 고지혈증 흰쥐에 미치는 영향 (Effects of Fermented Extracts Zizyphus jujuba Fruits and Leaves Mixture on Hyperlipidemia in Rats Induced by High Fat Diet)

  • 정명수;조화은;김혜자;최윤희
    • 대한예방한의학회지
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    • 제19권1호
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    • pp.117-130
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    • 2015
  • Objective : This study was designed to investigate the effects of non fermented Zizyphus. jujuba mixture (mixed fruit and leaf : ZM) and fermented Z. jujuba mixture(FZM) on fed high-fat diet induced hyperlipidemic rats for development medicinal food. Method : The extracts prepared for Zizyphus. jujuba mixture(ZM) and fermented Z. jujuba mixture(FZM) with Lactobacillus plantarum and Saccharomyces cerevisiae. Experimental group was divided into normal control group(NC group) and high fat diet groups. The high fat diet groups fed high fat diet 2 weeks after was sub-divided into high fat diet control group(HC group), high fat diet positive control group(HPC group), non fermented Z. jujuba mixture extract group(ZM group) and fermented Z. jujuba mixture extract group(FZM group). NC and HC group was orally administerd of 0.9% saline, HPC group administerd lovastatin diluted in 0.9% saline at a dose of 10 mg/kg BW, ZM and FZM groups was administerd each extracts diluted in 0.9% saline at a dose of 300 mg/kg BW once a day on a fixed time for 4 weeks. In the present study we measured organ weight, epididymal fat tissue weight, concentration of serum lipids, hepatic lipids, MDA contents in liver tissue and metabolic variables in serum. Results : ZM and FZM suppressed testis weight loss and FZM decreased epididymal fat tissue weight to level of NC group in high-fat diets. ZM and FZM did not influence on serum cholesterol level, but prominently decreased serum triglyceride concentration compared with HC group, and FZM diminished hepatic triglyceride same as serum. ZM and FZM did not impair liver and kidney function and influence positive effects through by suppression of elevation lipid level. Conclusion : These results suggested that Z. jujuba mixture(ZM, FZM) should be useful developing medicinal food for prevention and improvement of hyperlipidemia and FZM is more suitable agent than ZM.