• 한국도로학회논문집
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• 제14권5호
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• pp.93-99
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• 2012

PURPOSES: The purpose of this study is to compare the alkali-silica reactivity for mortar bar and concrete prism specimens using crushed aggregates of 5 types in Korea. And the alkali-silica reactivity for those aggregates are measured by chemical test method. METHODS: The alkali-silica reactivity for those aggregates was measured by chemical test method of KS F 2545, mortar-bar test of KS F 2546, accelerated mortar-bar test method of ASTM C 1260 and concrete prism test method of ASTM C 1293, relatively. RESULTS: The alkali-silica reactivity for those aggregates was verified by chemical test of KS F 2546 and accelerated mortar-bar test of ASTM C 1260. However, it was not by mortar-bar test of KS F 2546 and concrete prism test of ASTM C 1293. CONCLUSIONS: The above results showed that relationship among the four test methods were very low. The results from 3 types of test methods using cement-aggregate combinations appeared to be different. Because the environmental conditions of test methods for measuring the alkali-silica reactivity such as equivalent alkali content(external source), humidity, temperature, and times were different though the aggregates were same. Moreover, alkali-silica reactivity showed the biggest impact when alkalis were supplied form outside and exposed to environmental conditions. The accelerated mortar-bar test method seems to be most appropriate test method for concrete structures exposed to alkali environment.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2000년도 춘계학술대회 발표논문집
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• pp.185-191
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• 2000

A survival variable is a nonnegative random variable X with distribution function F and a survival function (equation omitted)=1－F. This variable is said to be New Better than Used of specified age $t_{0}$ if (equation omitted) for all $\chi$$\geq$0 and a fixed to. We propose the test for $H_{0}$ : (equation omitted) for all $\chi$$\geq$0 against $H_1$：(equation omitted) for all $\chi$$\geq$0 when the specified age $t_{0}$ is unknown but can be estimated from the data when $t_{0}$=${\mu}$, the mean of F, and also when $t_{0}$=$\xi_p$, the pth percentile of F. This test statistic, which is based on a linear function of the order statistics from the sample, is readily applied in the case of small sample. Also, this test statistic is more simple than the test statistic of Ahmad's test statistic (1998). Finally, the performance of this test is presented.

• 품질경영학회지
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• 제25권3호
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• pp.11-21
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• 1997

The mean residual life(MRL) function gives the expected remaining life of a item at age t. In particular F is said to be an increasing intially then decreasing MRL(IDMRL) distribution if there exists a turing point $t^*\ge0$ such that m(s)$\le$ m(t) for 0$$\le s$\le$ t $t^*$, m(s)$\ge$ m(t) for $t^*\le$ s$\le$ t. If the preceding inequality is reversed, F is said to be a decreasing initially then increasing MRL(DIMRL) distribution. Hawkins, et al.(1992) proposed test of H0 : F is exponential versus$H_1$: F is IDMRL, and $H_0$ versus $H_1$' : F is DIMRL when turning point is unknown. Their test is based on a complete random sample $X_1$, …, $X_n$ from F. In this paper, we generalized Hawkins-Kochar-Loader test to random censored data.

• 한국콘텐츠학회논문지
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• 제15권2호
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• pp.292-300
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• 2015

본 연구는 여대생의 체중조절행위와 비만스트레스를 파악하고자 2013년 9월 7일부터 9월 13일까지 경상남도 C시 소재 4개 대학에 재학 중인 여대생 213명을 대상으로 설문지를 배부하여 자료를 수집하였다. 수집된 자료는 SPSS 20.0 프로그램을 이용하여 빈도와 백분율, t-검증(t-test), 일원분산분석(ANOVA), 사후 검증(Scheffe's-test)을 실시하였다. 본 연구결과 대상자의 비만스트레스 정도는 $18.26{\pm}5.66$으로 중간정도로 나타났다. 대상자의 일반적 특성 및 체중조절행위 특성에 따른 비만스트레스와의 차이는 경제상태(F=3.99, p=.020), 체형인식(F=14.41, p<.001), 체형 체격 만족도(F=15.88, p<.001), 체중조절관심도(F=4.82, p=.001), 음식량 조절(F=2.41, p=.050), 체형 체격 강박(F=24.06, p<.001), 식이요법경험(F=6.04, p<.001), 평균수면시간(t=2.10, p=.036), 원하는 체중 감량정도(F=10.47, p<.001)에 따라 유의한 차이가 있었다. 따라서 여대생을 대상으로 올바른 체중인식과 체중조절 프로그램의 개발 시에는 비만스트레스와 관련한 다양한 특성들을 고려하여 개발하는 것이 필요하다.

• 대한조선학회 특별논문집
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• 대한조선학회 2005년도 특별논문집
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• pp.144-150
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• 2005

The size of ship is being larger than the past in the shipping industry thanks to the increased quantity of goods transported by ship. Therefore, HHIC (Hanjin Heavy industries & Construction co., LTD) invented innovative construction method, so called 'DAM', to build a ship which is longer than the length of the HHIC's dry dock. On Erection at the sea by the application of DAM Method, Squeezing & Detachment of A/F film may occur as a result of the wave and the constriction between A/F film pre-applied on the side shell and DAM's Rubber Packing. Thus, the test for finding the minimum curing time of A/F film was performed to protect Squeezing & Detachment of A/F film on the hull. To verify the soundness of paint and to find the optimum condition during the erection period of the DAM, laboratory test was carried out under no immersion condition through the application of various coatings on the Rubber Packing. And two methods were selected from the results of laboratory test for actual MOCK-UP Test. In addition, the test for the film profile per temperature of silicone A/F coat and the film Squeezing was performed.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.31-31
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• 2000

In this paper, Ive design and test the V/F converter for KSR-III INS using commertial INC, VFC110, AD652. The test result shows that performance of AD652 is better than that of VFC110. Through the calibration of V/F converter, we show that the designed V/F converter has a good performance and is usable for KSR-III.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.679-684
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• 1997

In this study, compressive strengths of reinforced concrete compression members rehabilitated with C.F.L. were analyzed from the test. Test parameters are spacing, spliced length, and section area of rehabilitation material. Displacement, failure load were measured during test. The failure mode and ultimate load were analyzed from these measured data. Test result shows that closer spacing of C.F.L. is more effective. strengthening with 1-ply C.F.L. is more effective than that of specimen with 2-ply C.F.L. The compressive capacity of specimen spliced ($\pi$.D)/2 shows almost similar strength to that of non-spliced specimen. The ultimate load carrying capacity of specimen strengthened with C.F.L. is increased to 1.11~1.68 times of that of non-rehabilitation specimen.

• The Journal of Korean Physical Therapy
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• 제24권5호
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• pp.325-333
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• 2012

Purpose: The purpose of this study was to determine the concurrent validity between Figure-of-8 Walking Test (F8W), Berg Balance Scale (BBS), Four Squared Step Test (FSST), and Timed UP and GO Test (TUG) in patients with stroke. Methods: Forty two participants (26 men, 16 women, $55.0{\pm}11.72$) with at least three months post stroke who were able to walk at least 10 m without walking aid participated in this study. Assessment of concurrent validity between the F8W (time and steps) and BBS was performed using Spearman rank order correlation and between the F8W (time and steps), FSST and TUG assessed using Pearson correlation. Results: The time of the F8W showed correlation with BBS (r=-0.46, p<0.01), FSST (r=0.64, p<0.01), and TUG (r=0.81, p<0.01), and steps of the F8W showed correlation with BBS (r=-0.43, p<0.01), FSST (r=0.47, p<0.01), and TUG (r=0.51, p<0.01). Conclusion: The F8W is a valid measure of balance and walking skill among patients with stroke and may provide complementary information with regard to dynamic balance and functional walking for the real life of stroke patients.

• 응용통계연구
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• 제24권1호
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• pp.45-59
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• 2011

시계열에는 1년 주기의 계절변동이 포함되어 있다. 시계열의 기조적 움직임을 살펴보기 위해서는 시계열에서 계절 변동을 제거하는 계절조정이 필요하다. 계절조정 프로그램 X-12-ARIMA에서는 F검정과 Kruskal-Wallis검정으로 시계열에 존재하는 계절변동(계절성)을 식별하고, 스펙트럼 그래프로 계절조정후 불규칙변동에 계절변동이 남아 있는 지 점검한다. 본 연구에서는 평활 검정을 계절성 검정에 적용한 평활 계절성 검정을 제안하고, 그 특성을 모의실험과 실제 시계열에 대한 계절성 검정을 통해 살펴보았다. 모의실험 결과를 보면 평활 계절성 검정이 X-12-ARIMA의 스펙트럼 분석을 계량화하고, 계절성 검정인 F검정과 Kruskal-Wallis검정을 보완할 수 있을 것으로 판단된다.

• 한국산학기술학회논문지
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• 제12권7호
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• pp.3296-3301
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• 2011

배수성포장은 다양한 장점을 가지고 있어 점차 보편화되고 있는데, 주요 효과로는 수막현상 최소화, 빗물에 의한 미끄럼저항값을 일정하게 유지하고, 차량과 포장체 사이에서 발생하는 소음을 저감시켜준다. 도로소음 및 수막현상 감소효과에 대한 많은 연구가 수행되었다. 본 연구의 목적은 배수성 포장 표층의 역학적 특성(강도 및 탄성계수)을 평가하는 것이다. 시험에 사용된 시편은 선회다짐기를 이용하여 제작하였다. 배수성포장의 상부표층 및 하부표층용 시편을 실험에 이용하였다. 마샬안정도시험(KS F 2377), 자유단공진주시험(KS F 2730), 일축압축시험(KS F 2314), 슈미트햄머시험 등을 수행하였다. 일축압축강도 및 슈미트햄머를 이용한 강도값을 비교 분석하였다.