• 대한토목학회논문집
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• 제28권6C호
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• pp.379-388
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• 2008

대형말뚝기초의 양방향 재하시험에서 재하용량 기준이 정확하게 규정되어 있지 않다. 그래서 양방향말뚝재하시험을 수행함에 있어 많은 혼란이 발생하고 있으며 재하용량에서 최대 2배까지의 차이가 나타나고 있다. 본 연구에서는 양방향 말뚝재하시험 기준들을 고찰하였으며, 국내에서 수행된 양방향 말뚝재하시험 사례들에 기초하여 최대등가시험하중, 재하하중 증가비, 재하용량 증가비 및 설계하중 충족비를 분석하였다. 양방향 말뚝재하시험 기준은 1방향 재하용량으로 정의되어야 하며, 1방향 재하용량은 설계하중의 2배 이상 이어야 한다는 것을 알 수 있었다.

• 한국항공우주학회지
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• 제45권10호
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• pp.892-897
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• 2017

무기체계 SW 개발 전반에 대한 규정인 방위사업청의 무기체계 SW 개발 및 관리 매뉴얼이 개정될 때마다 SW 신뢰성 및 품질향상을 위해 SW 신뢰성 시험의 수준과 범위를 상향하는 방향으로 변경됨에 따라 SW 신뢰성 시험은 SW 개발자에게 큰 부담이 되고 있다. 특히 동적시험은 무기체계 SW를 구현하는데 필요한 일정과 인력에 육박할 정도의 비용이 소요되고 있으며, 1회성으로 그치지 않고 소스코드 형상이 변경될 때마다 수행해야 한다. 본 논문에서는 동적시험 도구인 VectorCast를 이용하여 동적시험을 최초 1회 수행한 후 소스코드 형상변경으로 인한 동적시험 회귀시험 시 사람의 개입을 최소화하여 자동으로 회귀시험을 수행하고 결과 보고서를 생성해주는 회귀시험 자동화 프로그램인 VectorCast Environment Manager 개발에 대해서 기술한다.

• 수산해양기술연구
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• 제56권2호
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• pp.172-182
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• 2020

In order to offer specific information needed to assist in operation of a ship with same type rudder through evaluating the maneuverability of training ship A-Ra with flapped rudder, sea trials based full scale for turning test, zig-zag test with rudder angle 10° and 20°, and spiral test at service condition were carried out on starboard and port sides around Jeju Island according to the standards of maneuverability of IMO. As a result, the angular velocity of port turn was higher than that of starboard turn. Therefore, the size of turning circle was longer on the starboard side. In addition, variation of the transfer due to various factors was more stable than those of the others. In the Z-test results, the mean of 1st and 2nd overshoot angles were 9.8°, 6.3° and 15.3°, 9.2° respectively when the port and starboard was 10°; the 1st overshoot angle were 18°, 13.7° when using 20°. Her maneuverability index T' and K' can be easily determined by using a computer with the data obtained from Z-test where K' and T' are dimensionless constants representing turning ability and responsiveness to the helm, respectively. In the Z-test under flap rudder angle 10°, the obtained K' value covered the range of 2.37-2.87 and T' was 1.74-3.45. Under the flap rudder angle 20°, K' and T' value showed 1.43-1.63, 1.0-1.73, respectively. In the spiral test, the loop width was unstable at +0.3° and -0.5°-0.9° around the midship of flap rudder. As a result, course stability was comparatively good. From the sea trial results, training ship ARA met the present criterion in the standards of maneuverability of IMO.

• 대한수의학회지
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• 제19권1호
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• pp.63-67
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• 1979

In order to investigate modified Hayden test for mastitis test milk Samples from 120 cows (total 470 of quarters) were tested by this method. The tests were performed by different lactation age group, different calving frequency and their total quarters. Comparision of results were made between the modified Hayden method and the California Mastitis Test. The results obtained were as follows: 1. Ratio of results of mastitis test between modified Hayden method and California Mastitis Test was 1.1:1.0. 2. Incidence rate of mastitis in different Lactation age group shown 78.5% in 7 to 9 year group, 50% in 4 to 6 year age group and 37.5% in up to 3 year age group, respectively. 3. Incidence rate of mastitis with calving frequency, were 13.5% in 1 to 2 calving frequency group, 83.3% in 3 to 4 calving frequency group and 63.6% in 5 to 6 calving frequency group respectively. 4. Mastitis ratio between rear quarters and front quaters were 1.7:1.0. 5. It is probable that modified Hayden was more sensitive than the California mastitis test in detecting subclinical and clinical mastitis.

• 한국지반신소재학회논문집
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• 제16권1호
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• pp.9-17
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• 2017

본 연구에서는 암성토의 토공량 설계에 대한 대책방안으로 현장밀도시험을 수행하였으며, 현장밀도시험결과 암성토부의 발파암 평균 체적환산계수는 1.001로서 풍화암의 체적환산계수 1.1보다 작은 값이 나타났다. 이와 같이 암성토의 경우 여러 가지 현상에 의해 토공량의 증감 원인을 제공하고 있으나, 이에 대한 조사 및 시험방법 등 구체적인 기술 등이 부족한 실정이므로 본 연구결과에서와 같이 체적환산계수를 검토하기 위한 조사방법으로 현장밀도시험방법이 매우 유용한 방법임을 확인하였다.

• Geomechanics and Engineering
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• 제31권4호
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• pp.423-437
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• 2022

The objective of the study is to evaluate the feasibility of the dynamic behavior of slope through both 1 g shaking table test and numerical analysis. Accelerometers were installed in the slope model with different types of seismic waves. The numerical analysis (ABAQUS and DEEPSOIL) was used to simulate 1 g shaking table test at infinite boundary. Similar Acceleration-time history, Spectral acceleration (SA) and Spectral acceleration amplification factor (Fa) were obtained, which verified the feasibility of modeling using ABAQUS and DEEPSOIL under the same size. The influence of the size (1, 2, 5, 10 and 20 times larger than that used in the 1 g shaking table test) of the model used in the numerical analysis were extensively investigated. According to the similitude law, ABAQUS was used to analyze the dynamic behavior of large-scale slope model. The 5% Damping Spectral acceleration (SA) and Spectral acceleration amplification factor (Fa) at the same proportional positions were compared. Based on the comparison of numerical analyses and 1 g shaking table tests, it was found that the 1 g shaking table test result can be utilized to predict the dynamic behavior of the real scale slope through numerical analysis.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집A
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• pp.99-104
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• 2000

This paper describes the high temperature creep characteristics for virgin material of 9Cr1MoVNb steel using small punch creep(SP-Creep) test technique which is developing recently. In addition, the several results of SP-Creep test are compared with that of 2.25Cr- 1Mo steel which is widely used as boiler materials and that of conventional uniaxial creep test. The obtained SP-Creep curves show the creep behaviors of three regimes like that obtained from conventional uniaxial creep test, and SP-Creep properties are definitely depended on applied load and test temperature. The correlation of SP-Creep rate and creep rupture life with applied load has been determined like the correlation between creep rate/rupture life and stress in uniaxial creep test, and also is satisfied with Power law. The creep rupture times of newly 9Cr1MoVNb steel are higher than those of 2.25Cr1Mo steel at the same creep temperature and applied loading condition, and the decrease extent of creep rupture life with loads is very lower compared with 2.25Cr1Mo steel.

• 한국동물위생학회지
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• 제15권2호
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• pp.101-108
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• 1992

This study was carried out to investigate the effect of sulfamethazine and trimethoprim on TTC test in raw milk. Ten raw milks which does not contain any antibiotics were collected from milk farms and one hundred twenty raw milks which collected from three raw milk receiving stations and those milk samples were mixed up sulfamethazine and trimethoprim for TTC test. The results were as follows ; 1. Positive reactions of TTC test were shown above the concentration of 3, 000ppm for sulfamethazine and 10ppm for trimethoprim. 2. When the TTC test was conducted with trimethoprim and sulfamethazine mixture, a pair of the concentration of trimethoprim and sulfamethazine shown to positive reaction were 0.1-2, 000ppm, 0.5-1, 000ppm, 1.0-250ppm and 2.0-100ppm, respectively. 3. Of 120 raw milk samples tested, 16 samples(13%) were shown quasi-positive reaction when the trimethoprim at the concetration of 2ppm was added in the samples.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.68.5-68
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• 2002

For the performance test of rechargeable electric tools, it is necessary to test under the same condition as the actual operation condition. They are necessary to control the load torque and to acquire the test data with a computer, and it should be convenient to fix the tool on the test equipment for rechargeable electric tools. It consists of torque loading parts, sensing parts and control software. Two hysteresis brakes, connected serially with flexible coupling, were applied to control the load for the test. The sensing part consists of a torque sensor, a rpm detector and a power analyzer. The torque and the rpm were measured in order to calculate the output of the rechargeable electric...

• Toxicological Research
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• 제18권3호
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• pp.267-273
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• 2002

Fructose 1,6-diphosphate(FDP), a glycolytic metabolite, is reported to ameliorate inflammation and inhibit the nitric oxide production in murine macrophages stimulated with endotoxin. It is also reported that FDP has cytoprotective effects against hypoxia or ischemia/reperfusion injury in brain and heart, and may play a protective role in ultraviolet B (UVB, 280~320 nm)-injured keratinocyte by attenuating prostaglandin (PG)-E$_2$production and cyclooxygenase (COX)-2 expression, which are possibly through blocking the intracellular reactive oxygen species (ROS) accumulation. Therefore FDP is considered to act as a potent antioxidant especially in the skin. We conducted the several safety tests (single-dose toxicity, primary skin irritation test, eye irritation test, skin sensitization test, phototoxicity test, photosenitization test and human patch test) to see if FDP is safe in case used for the skin application. Our data obtained hitherto suggest that FDP is very safe if applied to the skin.