• Title/Summary/Keyword: environmental test

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Stability of Environmental Disposition Validated Through a Shout Term Education -The Effect of 'Interior Design History' Course on Students' Environmental Disposition- (단기교육 영향에 대한 실내환경적 성향의 안정성 규명연구 -'실내디자인 양식사' 수강경험이 실내환경적 성향에 미치는 영향-)

  • 이연숙;이선미;이경은;민지희
    • Korean Institute of Interior Design Journal
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    • no.20
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    • pp.3-9
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    • 1999
  • The purpose of this study was to verify the stability of environmental disposition through analyzing the short term effect of the 'Interior Design History' course on students environmental dispositions, especially their interior image preferences toward traditional/modern, female/masculine, and simple/complex characteristics. The pre-test post-test control group experimental design was used. The independent variable was the experience of the Interior Design History course, and the dependent variable was environmental disposition measured by IIPS(Interior Image Preference Scale). The measurements were done at both beginning and end of fall semester, 1997. Subjects were using 71 undergraduate students of Drafting course (control group) and 35 undergraduate students of Interior Design History course (experimental group) at Y University. Data were analyzed using frequency, percentage, mean, and F-test through ANOCOVA. This research revealed no effect of the Interior Design History course on students interior environmental dispositions. The stability of those environmental dispositions and also the validity of the IIPS were proved.

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A Study on the Operational Environment of Signalling System (신호시스템 운용환경에 관한 연구)

  • 정의진;이종우;황종규
    • Proceedings of the KSR Conference
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    • 2000.05a
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    • pp.164-171
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    • 2000
  • To determine operational requirement, the environmental condition for an equipment must be investigated, and to certify equipment's normalized operation, appropriate test must be carried out under the considered environmental condition. The actual environmental conditions to which equipment is likely to be exposed are normally complex and will comprise a number of environmental factors and corresponding parameters, When defining the environmental conditions for a certain application it is, therefore, necessary to list the factors involved and select the appropriate severity. For the preparation to determine operational requirement, environmental condition of equipment is investigated. The environmental condition is structured in two separate such as requirements, guidance and test specifications. For the first step, environmental requirements are considered

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A study on thermal behavior of energy textile by performing in-situ thermal response test and numerical simulation (현장 열응답 시험과 수치해석을 통한 터널에 적용된 에너지 텍스타일의 열적 거동 연구)

  • Lee, Chul-Ho;Park, Moon-Seo;Min, Sun-Hong;Jeoung, Jae-Hyeung;Choi, Hang-Seok
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.325-335
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    • 2010
  • A new geothermal energy source obtained from a tunnel structure has been studied in this paper. The geothermal energy is extracted through a textile-type ground heat exchanger named "Energy Textile" that is installed between a shotcrete layer and a guided drainage geotexitle. A test bed was constructed in an abandoned railway tunnel to verify the geothermal heat exchanger system performed by the energy textile. To evaluate the applicability of the energy textile, we measured the thermal conductivity of shotcrete and lining samples which were prepared in accordance with a common mixture design. An overall performance of the energy textile installed in the test bed was evaluated by carrying out a series of in-situ thermal response test. In addition, a 3-D finite volume analysis (FLUENT) was adopted to simulate the operation of the ground heat exchanger being encased in the energy textile with the consideration of the effect of the shotcrete and lining thermal conductivity.

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롯드 체결에 따른 에너지 전달 평가

  • Bae, Myeong-Ho;Yoon, Hyung-Koo;Kim, Ju-Han;Lee, Jong-Sub
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.03a
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    • pp.171-175
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    • 2010
  • Various soil characteristics for safe construction is necessary to understand the tests using the samples collected, and head in place an energy evaluation is conducted to evaluate the ground. In-Situ testing ground, Rod length and around the intrusive when the energy loss due to friction has been measured only in the head. Abstract The purpose of this agreement when increasing contract area of Rod agreement to transform the energy attenuation and the attenuation at the energy being delivered to evaluate. To this end, the same material used in the field test, laboratory test to apply Rod diameter and length have been considered, designed to perform the experiment was to use the Rod. Energy that raised at head of Rod, was increased and decreased by contracting type. The energy difference occurs in the head with the tip that shows the energy rating may be required at the tip is showing. Abstract The energy evaluation for the Rod field test to be at the basic sources and will be able to calculate the trusted information are measured from the tip.

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Comparison of Pluviation and Vibrating table method on the Minimum void ratio of crushed sand (인공모래의 최소간극비 산정 시 플루베이션과 진동대 시험법의 적용성 비교)

  • Cho, Youg-Soon;Kim, Rae-Hyun;Kim, Jae-Jeong;Lee, Woo-Jin
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.10a
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    • pp.1290-1295
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    • 2008
  • The relative density of soil indicate loose and dense state of sand. Because sand is low compressibility, initial relative density of sand is important effect factor of compression and shear behavior. To measure exactly relative density, the exactly maximum and minimum void ratio was determinated by laboratory tests. Generally, vibrating table method is adapted for minimum void ratio(KS F 2345). However KS F 2345 is not consider the particle break during the vibrating table test. In this study, The minimum void ratio is compared with a method of Pluviation and Vibrating table test results using the K-7(crushed sand). It is concluded that the K-7 sand particles were crushed during the vibrating table test and vibrating table test is not a suitable test for a crushed sand $e_{min}$.

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Reliability Assessment Criteria of Air Quality System (자동차용 유해가스 검출기의 신뢰성 평가기준)

  • Choi, Man-Yeop;Park, Dong-Kyu;Oh, Geun-Tae;Jeong, Hai-Sung
    • Journal of Applied Reliability
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    • v.10 no.4
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    • pp.279-297
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    • 2010
  • AQS(Air Quality Control System) is the important part of a car air conditioning system. This device intercepts automatically the influx of harmful waste gas. In this paper reliability assessment criteria for AQS are established in terms of quality certification test and lifetime test. The former quality certification test comprises general performance test and environmental test. Items which pass the test undergo lifetime test which guarantees the extent of mean lifetime with certain confidence.

Use of Duckweed (Lemna gibba) Growth-Inhibition Test to Evaluate the Toxicity of Chromate in Korea (환경독성 평가를 위한 좀개구리밥(Lemna gibba)의 성장저해시험법에 관한 연구)

  • 김은주;이성규
    • Environmental Analysis Health and Toxicology
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    • v.16 no.4
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    • pp.205-209
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    • 2001
  • Lemna gibba was newly cultured and provided for toxicity tests. In this study, the chromate toxicity tests for Lemna gibba were performed according to the OECD Lemna growth inhibition test guideline. The test species was Lemna gibba, and the tests were repeated 5 times. To evaluate the toxicity test results, the average specific growth rate, EC50, 95% confidential limit, and variances were calculated. The test performance was analyzed by the doubling time and test statistics. The average values of EC50 data determined by logistic and linear interpolation curves were 25.9 ppm and 35.4 ppm respectively (by chromate concentration). The doubling time of all controls were below 2.5 day, so all tests passed the criteria for the test performance. This study introduced a new test method, Lemna growth inhibition test, which is provided for the hazard assessment of aquatic environment.

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Reliability Assessment Criteria of Differential Pressure Sensor for DPF (자동차용 DPF 차압센서의 신뢰성 평가기준)

  • Chung, Wooyoung;Min, Joonwon;Park, Dongkyu;Choi, Jungwoon;Choi, Wooseok;Kim, Sidong
    • Journal of Applied Reliability
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    • v.15 no.1
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    • pp.67-75
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    • 2015
  • Differential pressure sensor for DPF (Diesel Particulate Filter) is the important part of a automobile exhaust system. This device measures the pressure of before DOC and after DPF to determine whether the DPF regenerate. In this paper reliability assessment criteria for DPF differential pressure sensor are established on terms of quality calcification test and lifetime test. The former quality certification test comprises general performance test and environmental test. Items which pass the test undergo lifetime test which guarantees the extent of mean lifetime with certain confidence.

Reliability Assessment Criteria of Brushless Motor for Optical Disk Drive (광기기 저장매체 구동용 BLDC 모터의 신뢰성 평가기준)

  • Song, Byeong-Suk;Chan, Sung-Il;Jeong, Hai-Sung;Baik, Jai-Wook
    • Journal of Applied Reliability
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    • v.9 no.1
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    • pp.1-12
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    • 2009
  • BLDC motors are stored in the devices such as CD-RW, COMBO, DVD-ROM and CD-ROM. It is indispensable to establish reliability assessment criteria for BLDC motors, especially in the world where IT grows rapidly. In this article, reliability certification procedure is given. The reliability certification procedure consists of two separate tests such as quality certification test and lifetime test. The former quality certification test comprises general performance test and environmental test. Items which pass the test undergo lifetime test which guarantees the extent of mean lifetime with certain confidence.

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Reliability Assessment Criteria of Motorized Roller Conveyor (자체구동롤러 컨베이어의 신뢰성 평가기준)

  • Kim, Young-Joo;Go, Hee-Yang;Han, In-Sup;Kim, Yong Soo
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.5
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    • pp.521-529
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    • 2015
  • Owing to a reliance on imported products from Europe and Japan, the use of logistics equipment with poor energy efficiency coupled with high maintenance costs can lead to high operating costs for some domestic logistic centers. To lower their operating costs, the logistic centers use motorized roller conveyors. In order to commercialize this process, it is necessary to establish the test criteria and assess the reliability of the process. Currently, there exists no standard verification method to test the reliability of motorized roller conveyors. In this study, we propose reliability assessment criteria for a: i) reliability test, ii) environmental test, iii) safety test, and iv) lifetime test.