• 제목/요약/키워드: Preliminary experiment

검색결과 582건 처리시간 0.024초

자동변형율 측정장치를 이용한 자동차용 실판넬의 문제점해결 방안 (A problem solving plan in automotive panel forming using the automated strain analysis and measurement environment)

  • 서만석;김형준
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1994년도 박판성형기술의 진보
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    • pp.119-128
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    • 1994
  • Until recently, Stamping tool manufacturing depend on skilled designers and technicians, because it has many parameters. So, Try-out time not controlled. We now apply CAE, preliminary experiment, material database and automated stain measurement in stamping tool manufacturing for concurrent engineering that decreases product development circle time, saves cost, improves product reliability. Automated strain analysis and measurement environment gives very accurately informations to technicians of stamping tool manufacturing. They analysed the part in problem and appled to results in Try-out step.

초음파 센서기반 추적 알고리즘을 이용한 자동 수술 조명 로봇 시스템 (Implementation of Auto Surgical Illumination Robotic System Using Ultrasonic Sensor-Based Tracking Algorithm)

  • 최동걸;이병주;김영수
    • 대한의용생체공학회:의공학회지
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    • 제28권3호
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    • pp.363-368
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    • 2007
  • Most surgery illumination systems have been developed as passive systems. However, sometimes it is inconvenient to relocate the position of the illumination system whenever the surgeon changes his pose. To cope with such a problem, this study develops an auto-illumination system that is autonomously tracking the surgeon's movement. A 5-DOF serial type manipulator system that can control (X, Y, Z, Yaw, Pitch) position and secure enough workspace is developed. Using 3 ultrasonic sensors, the surgeon's position and orientation could be located. The measured data aresent to the main control system so that the robot can be auto-tracking the target. Finally, performance of the developed auto-illuminating system was verified through a preliminary experiment in the operating room environment.

Kansei Evaluation by a Remote-Controlled Robot Designed for Viewing Art Exhibits

  • Akira, Lkazaki;Hiroya, Igarashi;Shoichi, Maeyama;Akira, Harada
    • 한국감성과학회:학술대회논문집
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    • 한국감성과학회 2000년도 춘계 학술대회 및 국제 감성공학 심포지움 논문집 Proceeding of the 2000 Spring Conference of KOSES and International Sensibility Ergonomics Symposium
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    • pp.301-305
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    • 2000
  • The present study is part of the Special Research Project for the Construction of a Kansei Sensory Evaluation Model that is currently underway at the University of Tsukuba. In this study, a robot was operated by remote control at an actual art museum as part of a preliminary experiment. The results obtained therefrom were used to consider how people might view exhibits. In a previous study, a standard lens and s wide-angle lens were used to analyze differences in sensory-based movements, while VRML was used to analyze differences in these movements between a virtual and an actual museum. In the present study, the time delay in remote operation, which is currently unavoidable, placed some restrictions on the degree of freedom with which exhibits could be viewed, but it was apparent that sensory evaluation could be possible depending on the search behavior and viewing time. Furthermore specific viewing behaviors using the robot were observed, suggesting that new Kansei sensory perceptions were derived from these behaviors.

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알팔파의 생리활성물질 분리 및 동정 (SEPARATION, IDENTIFICATION OF BIOACTIVE COMPOUNDS FROM ALFALFA PLANT)

  • 정일민;김기준
    • 분석과학
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    • 제7권3호
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    • pp.403-411
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    • 1994
  • 본 실험은 알팔파의 Allelopathy와 Autotoxicity에 관련되는 생리활성 물질의 분리, 정제, 동정하기 위하여 실시되었다. 알팔파 생잎 1kg을 80% MeOH로 추출하여 silica gel TLC와 DCCC의 분리와 정제과정을 거쳐 HPLC로 동정하였다. HLPC 분석결과 4개의 phenolic 물질(salicylic acid, rutin, quercetin, scopoletin) 등이 동정되었다. 이들 물질을 이용한 발아실험에서도 모두 알팔파의 발아와 생육에 억제적으로 작용하였으며, 이 중 quercetin의 처리가 가장 억제적이었다. 따라서 최소한 이들 물질이 알팔파의 Allelopathy와 Autotoxicity에 관련하는 것으로 생각되었다.

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자세 균형 측정을 위한 디지털 경사계 설계 (A Design of Digital Inclinometer for Measuring Postural Balance (Preliminary Study))

  • 명현석;이효기;이경중;권오윤
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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    • pp.238-240
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    • 2006
  • In this study, we designed a digital inclinometer to measure the angle and acceleration signals. Digital inclinometer consists of a tilt sensor, accelerometer, one-chip micro controller and BlueTooth module. Using the developed system, we made an experiment with Roll. The subject is laid on the Roll and rises each foot $90^{\circ}$ and $45^{\circ}$ up, and measures angle and acceleration signals with 100Hz sampling frequency. Through several tests, we could find the possibilities and usefulness which can evaluate normality / abnormality of body posture objectively.

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Three Cytotoxic compounds isolated from the seeds of Pharbitis nil

  • Lee, J.E.;Byun, S.J.;Son, J.K.;Lee, J.S.;Lee, S.H.;Woo, M.H.
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.368.3-369
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    • 2002
  • Pharbitis nil Choisy (convolvulaceae) is an annual vine plant and grows at the wayside of Korea. Japan. China and India. The seeds of blue or red Pharbitis nil Choisy. Pharbitidis Semen, is black or red-brown. This seeds have been used as a purgative. From a preliminary experiment. Pharbitidis Semen exhibited anti-cancer activity. MeOH extract of this seeds was subsequently fractionated into four parts: methylene chloride, ethylacetate, n-butanol and water fractions. (omitted)

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A Study on Characteristics of Flux-offset-type Fault Current limiter according to Initial fault current

  • Jung, Byungik;Hwang, Junwon;Choi, Hyosang
    • International Journal of Internet, Broadcasting and Communication
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    • 제7권2호
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    • pp.117-122
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    • 2015
  • Our research team proposed a flux-offset type fault current limiter as a new limiter. The flux-offset type fault current limiter uses a fault current limit technology based on the flux offset principle of the primary and secondary windings of a transformer. Stable fault current limit characteristics were achieved through a preliminary study. However, it was discovered that the initial fault current was not limited. Therefore, in this paper, a high-speed interrupter and a superconducting element were separately applied to the secondary winding of the flux-offset type fault current limiter and the operating characteristics were comparatively analyzed. In the experiment, when the superconducting element was applied to the secondary winding of the transformer, the initial fault current was limited while the limitation in the operation time was further shortened.

Effects of Dietary Fructan on Cecal Enzyme Activities in Rats

  • Kang, Soon-Ah;Chun, Uck-Han;Jang, Ki-Hyo
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제10권6호
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    • pp.582-586
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    • 2005
  • In this Study, we have attempted to determine the effects of dietary fructose polymers (fructan), high molecular-weight ${\beta}-(2,6)-linked$ levan, and low-molecular-weight ${\beta}-(2,1)-linked$ inulin, on two intestinal enzymes $({\beta}-glucuronidase\;and\;{\beta}-glucosidase)$. As a preliminary experiment, when intestinal microflora were cultured in anaerobic media harboring levan or its oligosaccharides, bacterial cell growth was observed in the levanoligosaccharide-supplemented media, but not in the levan-supplemented media, indicating that levan's size is important for the utilization by intestinal bacteria of levan as an energy Source. In our animal study, the intake of a levan-rich diet was determined to significantly attenuate the activity of the harmful enzyme $({\beta}-glucuronidase$, but d id not affect the activity of ${\beta}-glucosidase$.

PPT 기반 MPPT 컨버터에 의한 태양광 발전시스템의 효율 개선 (An Efficiency Improvement of the Photovoltaic Generation System by Using the PPT based MPPT Converter)

  • 이은철;이성룡
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권4호
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    • pp.216-223
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    • 2006
  • In this paper, a methodology for the efficiency improvement of the photovoltaic system without adding some elements or increasing the cost comparing with the conventional system is discussed. It is suggested the optimal photovoltaic module configuration through its performance analysis, and also the suitable maximum power point tracking (MPPT) voltage considered the system cost and the efficiency of the converter. The high efficiency photovoltaic system by using the parallel power transfer (PPT) based MPPT converter is proposed and analyzed theoretically comparing with the conventional Buck type MPPT converter. Finally, it is designed and implemented the proposed photovoltaic system for supplying DC 48V by using the PPT based MPPT converter. And the effect of the efficiency improvement and the usefulness of the proposed system is proved through some preliminary simulation and experiment results.

Foodborne Pathogen Reduction을 위한 항균제의 새로운 Delivery System인 Aerosolization

  • 오세욱;강동현
    • 식품기술
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    • 제18권1호
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    • pp.91-98
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    • 2005
  • Aims: As a preliminary experiment on new sanitizer delivery tools, the efficacy of aerosolizedsanitizer on foodborne pathogens was investigated in larger model chamber system.Methods: Peroxyacetic acid and hydrogen peroxide were aerosolized in a model system againstartificially inoculated target microorganisms on laboratory media. Cultures of 4 different foodborne pathogens were inoculated and affixed onto 3 different heights (bottom, wall, and ceiling), and 3different orientations (face-down, vertical, and face-down) inside a commercial semi-trailer cabinet(14.6 x 2.6 x 2.8 m). Sanitizer was aerosolized into 2 m droplet size fog and treated for 1 h atambient temperature.Results: Populations of Bacillus cereus, Listeria innocua, Staphylococcus aureus, and Salmonellatyphimurium were reduced by an average of 3.09, 7.69, 6.93 and 8.18 log units per plate, respectively.Interestingly, L. innocua, Staph. aureus, and Salm. typhimurium showed statistically not different (P$\leq$ 0.05) reduction patterns relative to height and orientation that were never expected in a sprayingsystemConclusion and significance: Aerosolized sanitizers diffuse like gaseous sanitizers, so it has greatpotential for use in commercial applications.

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