• 제목/요약/키워드: 분리 시험

검색결과 1,731건 처리시간 0.027초

Modulation of Human Macrophage Phagocytic Activity by C-reactive Protein (C 반응성 단백질이 사람 Macrophage 탐식 기능에 미치는 영향)

  • 김용호;강신원
    • Biomedical Science Letters
    • /
    • 제4권1호
    • /
    • pp.35-42
    • /
    • 1998
  • The effects of CRP purified from human ascites fluid on phagocytic activity of the human macrophage were investigated. CRP was purified using affinity chromatography including absorption on p-diazonium phosphocholine or C-polysaccharide coupled sepharose 4B and gel filtration on hydroxylapatite column chromatography. Macrophage was separated ficoll hypaque gradient density and absorption method, and then was confirmed phagocytic uptake test using latex method. CRP was able either to inhibit or to enhance phagocytic activity of human macrophage against bacteria in vitro. The effects of CRP on phagocytic activity of human macrophage were in time and dose-dependent manners. The additional sequence of reaction mixture against bacteria in vitro shows a threshold stimulus on the activation of phagocytic response upon the CRP.

  • PDF

Strength Characteristics of Concrete Subjected In Horizontal Continuous Vibration During Initial Curing (초기양생중에 수평연속진동을 받은 콘크리트의 강도특성)

  • 장희석;김명식;김종수;한중기
    • Journal of the Korea Concrete Institute
    • /
    • 제13권5호
    • /
    • pp.423-429
    • /
    • 2001
  • In this study, strength characteristics of concrete specimens subjected to horizontal continuous vibration during initial curing were investigated. As experimental variables, vibration velocity(0.25, 0.5, 1.0, 2.0, 4.0 kine) and vibration time(3, 6, 12, 24 hrs) were used. Density and segregation of the specimens were also investigated. Vibrating was started soon after placing, and strengths investigated consist of compressive strength, splitting tensile strength, and bond strength. Strengths decrease were hardly occurred at 0.25 kine vibration velocity regardless of vibration times and all strengths were increased for 3 hrs vibration at 0.5 kine vibration velocity. Density was increased for all specimens due to the vibration and there was no serious segregation under even 4 kine vibration velocity.

Ground Ejection Tests for the Safe Separation Analysis of a Gliding Bomb (활공탄의 안전분리 해석을 위한 지상투하시험)

  • Lee, Kidu;Lee, Inwon;Park, Youngkun;Baek, Seungwoock;Jung, Nahyeon;Jung, Sangjun
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • 제41권6호
    • /
    • pp.502-508
    • /
    • 2013
  • Various combinations of cartridge and orifice were applied for ground ejection tests of a gliding bomb model equipped with a new guidance kit. Larger diameter of orifice made larger ejection force at each of bomb racks. Normal operations of the wing deploying mechanism and the devices inside of the bomb model were confirmed. Also high speed video data showed that pitch angle of the gliding bomb varied due to the ejection force.

Experimental Study for the Safety Analysis of an External Store Separation from Fighter Aircraft (전투기 외부 무장분리 안전성 해석을 위한 풍동실험연구)

  • Yoon, Yong-Hyun;Cho, Hwan-Kee;Chung, Hyoung-Seog;Cho, Dong-Hyun;Lee, Sang-Hyun;Baek, Seung-Woock
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • 제37권3호
    • /
    • pp.232-239
    • /
    • 2009
  • The prediction of the separation trajectories of external stores carried by military aircraft is an important task in the area of aircraft design having the objective to define the operational, release envelopes. This paper presents the results obtained for safe store separation from a fighter aircraft by experimental methods in the subsonic wind tunnel. The problems associated with separation of external stores can be studied by the use of several wind-tunnel test techniques. Attention is given the two most useful techniques: 1) dynamically scaled drop-model testing, 2) grid testing. A description of each method is given and data obtained are shown to validate the similarity within acceptable limits.

Structural Test for Assembly Frame of Payload Fairing (페이로드 페어링 체결 프레임에 대한 구조시험)

  • Lee, Jong-Woong;Jang, Young-Soon;Yi, Yeong-Moo;Kong, Cheol-Won
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • 제35권12호
    • /
    • pp.1129-1134
    • /
    • 2007
  • Payload fairing protects satellites and electrical equipments from the external environment. Payload fairing is jettisoned before satellite separation. Assembly frame for the separation of payload fairing were assembled with shear bolts. The role of shear bolts is to support structural load during flight and they are cut by explosion of pyro. The assembly frame which is connected by shear bolts is separated after the cutting of shear bolts. In this paper, structural tests and analysis were done for the design of the shear bolt. Compression, bending and shear load apply to the hardware including assembly frame. Test results showed that design of the shear bolt satisfied both structural strength for the support of flight load and required low strength for the cutting of shear bolts.

A Study on Partial-Load Performance Experiment & Analysis for Dynamic Transient Effect of Free Shaft Gas Turbine Engine (분리 축 가스터빈엔진의 동역학적 천이효과에 의한 부분부하성능 시험 및 해석에 관한 연구)

  • 김경두;이원중;양수석
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 한국추진공학회 2003년도 제20회 춘계학술대회 논문집
    • /
    • pp.183-188
    • /
    • 2003
  • The present work was conducted to build a propulsion system for an airship. For this purpose, free shaft gas-turbine was modified to produce electrical power. he experiments were carried out to analyze the driving rotor condition at various power shaft loads. From this analysis, an appropriate damping device was required, and the changeable inertial moment from the fly-wheel was applied. Without the appropriate damping device, instability was found, and it was resulted as power loss. Also the amount of inertial moment was certified by the performance of dynamic transient effects from the engine test results. Knowledge gained from this research could benefit the propulsion and power conversion community by increasing the better understanding of shaft loads and inertial effects.

  • PDF

A Study on the Designation of Standard Solid Test Particles for Marine Centrifugal Purifier Performance Test (선박용 정유기 고형분 분리 성능시험 표준시료 지정에 관한 연구)

  • Jeong, Sang-Hu
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제31권6호
    • /
    • pp.804-809
    • /
    • 2007
  • In order to provide reliability. reproducibility. objectivity of solid particle separation performance test on marine centrifugal purifier, an investigation had been done on solid test dusts. test standards and designation of a definite standard test dust In test specifications or standards. ISO 121031-1 A2 test dust is the best test particle to meet commercial and military fuel oil and lube oil requirements on marine standards.

Studies on the Evaluation Method of Strength Comparison for Application in Joint Separation Test Body to Structural Concrete (구조체 콘크리트에 접합분리 시험체의 적용을 위한 강도비교에 관한 실험적 연구)

  • Kim, Seong-Deok;Lee, Seon-Ho;Jung, Kwang-sik;Paik, Min-su;Lee, Young-Do;Jung, Sang-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 한국건축시공학회 2008년도 춘계 학술논문 발표대회
    • /
    • pp.79-82
    • /
    • 2008
  • It has been reported that destruction test by core collection is the most reliable of the structural concrete strength in present building construction field. But it causes low efficiency by damage and cutting in structure due to the core collection. It also has some problems in repairing. Additionally in case of strength test with management specimen, different environment compared to the structure environment cause problems about estimation precise structure strength. Therefore, it is required to develop structure direct strength test that has test values and credibility above the ones obtained by core specimen collection strength test and seasonal specimen test to suggest a reasonable and practical management method of structural concrete.

  • PDF

Operation of Sum River Experimental Watershed in 2003 (2003년 섬강 시험 유역의 운영)

  • Kim, Sung Hoon;Choi, Hung Sik;Kim, Sang Ho;Lee, Pil Jin
    • Proceedings of the Korea Water Resources Association Conference
    • /
    • 한국수자원학회 2004년도 학술발표회
    • /
    • pp.578-583
    • /
    • 2004
  • 수자원 계획 및 관리에서 가장 중요한 요소는 우량, 하천 수위, 유량 등과 같은 기포 수문자료이다. 이들 자료는 신뢰성을 바탕으로 지속적인 관측에 의한 장기적인 수문자료로 축적되어야 한다. 본 연구에서는 강원도 횡성군의 남한강 제1지류인 섬강의 상류에 위치한 계천 유역과 같은 산지지형에 대한 시험유역의 운영을 통하여 신뢰성 있는 고품질의 산간유역 수문자료를 지속적으로 확보하고자 한다 이를 위해 우량자료는 지점별로 10분 및 1시간 간격으로, 수위자료는 10분 간격으로 관측을 실시하고 있다. 또한 수위관측소에 대한 정기적인 유량측정을 실시하였으며, 이에 대한 불확실도 분석을 실시하여 자료에 대한 신뢰도를 검증하였다. 이를 토대로 각 지점별 수위-유량관계곡선을 개발하였으며, 이때 홍수로 인한 하상변화를 고려하여 자료에 대한 기간분리와 저수위 및 고수위에 대한 구간분리를 실시하였다. 이와 같이 축적된 수문자료들은 산간유역의 물 순환 해석을 위한 기초자료로 활용될 것으로 기대한다.

  • PDF

Impact Characteristics of Garphite/Epoxy Composite Materials with Non-wowen Tissue (부직포를 삽입한 Graphite/Epoxy 복합재료의 충격 특성)

  • 정성균;서유원;이승환
    • Korean Journal of Crystallography
    • /
    • 제9권2호
    • /
    • pp.125-130
    • /
    • 1998
  • 본 논문에서는 부직포를 삽입한 Gr/Ep 복합재료의 충격 흡수 특성을 연구하였다. 계면(interface) 층에 유리 부직포 또는 탄소 부직포를 삽입하여 복합적층판을 제작하였다. 저속충격 시험을 수행하였으며, 충격에 의한 층간분리(delamination)를 C-Scan과 현미경을 사용하여 관찰하였다. 실험결과 계면에 부직포를 삽입함으로써 충격에 의한 층간분리 면적이 감소함을 알 수 있었다.

  • PDF