• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.23-29
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• 2009

A sand-cone method is commonly used to determine the density of the compacted soils. This method uses a calibration container to determine the bulk-density of the sand for use in the test. The density of the test or compacted soil is computed on the assumption that the calibration container has approximately the same size or volume and allows the sand to fall approximately the same height as a test hole in the field. However, in most cases the size or shape of test hole is not exactly the same as the calibration container. There is certain discrepancy between sand particle settlement or arrangement in the laboratory calibration and in the field testing, which may cause an erroneous determination of in-situ density. The sand filling process is simulated in the laboratory and its effect on the determination of density is investigated. Artificially-made holes with different heights and bottom shapes are prepared to simulate various shapes of the test hole in the field. The sands with different gradations are used in the testing to examine how sand grain size influences the determination of density in the field.

• 한국전자파학회논문지
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• 제14권8호
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• pp.796-802
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• 2003

본 논문에서는 전원주파수 자계 내성시험에 사용할 개선된 EUT(Equipment Under Test) 영상 모니터링 평가 방법을 제안하고, 실시간으로 영상 모니터링이 가능한 자동화 프로그램의 개발에 대하여 서술하였다. 제안된 평가방법에서는 전원주파수 자계 내성시험에서 전자파 영향을 받지 않은 모니터와 전자파 영향을 받은 모니터 사이의 영상의 변화를 자동화된 알고리즘에 의해 검출하여 내성 정도를 판별한다. 본 방법에서 사용된 영상변화의 실시간 판정을 위한 영상변화 검출 알고리즘은 시험의 재현성을 확보함으로써 기존의 방법인 시험자 주관적인 판단에 의한 단점을 보완하여 준다. EUT 영상의 변화 검출로 PC 모니터류에 대한 내성판정이 보다 정량적으로 가능함을 제시하였다. 또한 국제규격과 국내동향에 맞추어 EUT 내성판정법에서 정량적인 값을 도출하는 방법을 제안하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.539-545
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• 2010

The field plate test has a good potential for determining since it measures both plate pressure and settlement. The deformation modulus of rock mass is differently measured for status of structures. The values of deformation modulus are obtained from laboratory test (uniaxial and triaxial test) and field test (pressuremeter test). Plate load test should be conducted by different loading plate sizes for geological structure of rock mass and scale of structures. In this paper, large plate load tests were performed to predict of structure's behavior and evaluate the ultimate bearing capacity of the foundation on soft rock. Simultaneously, deformation modulus of rock mass was estimated by back analysis of stresses measured in field test under rock mass. Finally, we verified the validation of deformation modulus of rock mass through result of large plate load test and numerical simulation.

• 한국전산구조공학회논문집
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• 제19권4호
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• pp.325-335
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• 2006

본 논문에서는 설계와 해석을 거쳐 인발성형으로 제작된 중공단면 복합소재 교량 바닥판에 대해 휨 성능시험, 바닥판-거더 연결부시험, 바닥판-방호벽 연결부시험 등을 통해 구조적 특성을 분석하였다. 휨시험체에 지간 중앙에 변위계와 상 하부판의 주요부에 변형률계를 부착하여 파괴하중 재하시까지 거동을 계측하고 그 결과를 분석하였다. 휨시험체에 대한 유한요소해석도 실시하여 시험결과와 비교분석하였으며, 휨에 대한 극한 내하력을 추정하였다. 또한, 시범시공된 복합소재 바닥판 플레이트 거더 교량에 대한 현장 재하시험결과와 현장적용사례를 기술하였다.

• 한국도로학회논문집
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• 제19권2호
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• pp.45-53
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• 2017

PURPOSES: The objectives of this study are to develop a new cold-applied crack sealant and to evaluate its properties and field applicability by comparing with other conventionally used crack sealants. METHODS : A new cold-applied crack sealant was developed by using neoprene latex to improve material properties. The fundamental properties such as viscosity, residue %, penetration, and softening point of the developed crack sealant were tested by TxDOT criteria to evaluate crack sealing capability. Moreover, the performance of the developed cold-applied crack sealant was evaluated under both laboratory and field conditions. In the laboratory, the bond property was evaluated using the developed cold-applied crack sealant and conventional hot-applied crack sealant by the bond-properties test standardized under ASTM D 6690. In the field, test sections were constructed on three areas: a trunk road, bus-only lane, and motorway, with the developed crack sealant and three conventional crack sealants. After construction, early field-inspection was performed on the test sections. RESULTS AND CONCLUSIONS : Overall, the developed cold-applied crack sealant demonstrates reasonable storage stability, durability, and bond property compared to conventional hot-applied crack sealants. From the test sections, it was established that the developed cold-applied crack sealant does not pose construction issues. Moreover, the early performance was verified through field inspection. However, as the field inspection was conducted a week after the construction, it is necessary to conduct an inspection of performance from a long-term point of view.

• 대한공업교육학회지
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• 제31권2호
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• pp.128-154
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• 2006

지식기반사회에서 학교 교육의 질은 국가 발전의 핵심 요소이다. 교육의 질을 향상시키기 위해서는 무엇보다도 교육을 실제로 담당하고 있는 교사의 자질 향상이 중요하다. 그러므로 질 높은 교육 수준을 유지하기 위해서는 유능한 교원을 선발하고 임용하려는 노력이 필요하다. 이러한 시대 변화와 질 높은 교육수준을 유지하기 위해서 교사를 선발하는 임용고시의 중요성이 강조된다. 특히 공업계고등학교의 전기 전자 통신 과목의 임용시험은 기존의 세 분야 교과가 통합되면서 임용시험 문제 출제의 기준이 모호하여 전문교과 평가의 질적 저하가 우려된다. 이에 이 연구에서는 전기 전자 통신 과목의 교원 양성기관에 대한 교육과정과 제7차교육과정 및 기출문제를 분석하였다. 분석된 결과를 기초로 출제영역 비율 및 배점과 내용요소를 추출하였다. 추출된 내용은 전문가 협의회를 통해 검증한 후 다음과 같이 제시하였다. 첫째, 전기 전자 통신 과목의 임용시험은 교과교육학과 교과내용학 영역에서 출제되며 출제 비중은 교과교육학이 20%, 교과내용학이 80%로 한다. 둘째, 교과교육학의 하위영역은 '공업교육일반', '공업교육과정', '공업교수법', '실기지도법', '실습장조직관리', '공업교육평가', '산학협동교육', '직업 및 진로지도'로 구성한다. 셋째, 교과내용학은 공통전문, 기초전문, 응용전문으로 구성하고, 공통전문분야는 출제 비중이 7.4%, 기초전문분야는 20%, 응용전문 분야는 크게 전기분야, 전자분야와 통신분야로 나누며 각 영역의 출제 비중은 21.3%, 21.3%, 10%로 한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.717-724
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• 2011

In order to commercialize the track systems including the turnouts developed in Korea, the guideline of technical and systematic performance evaluation considering local environment was established on Aug. 2010. It consists of a technical compatibility, laboratory test and in-service test. Technical compatibility and laboratory test of the domestically-developed swing-nose crossing turnout on slab track(F18.5) were evaluated according to the guideline. And then in-service test was performed for the turnout installed at the 2nd phase site of Kyung-Bu HSR. In-service test is comprised of monitoring, and field and on-board test during KTX operation, where monitoring is to check the maintainability, and field and on-board test is to confirm structural and running safety. This paper is intended to explain the requirements for the in-serve test and analyze the results of monitoring and the data measured at field and on-board. Based on the in-service test, it is proven that performance of the domestically-developed swing-nose crossing turnout on slab track(F18.5) well satisfies the requirements of the guideline.

• 한국작물학회지
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• 제41권6호
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• pp.656-664
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• 1996

광산, 진주와 밀양에서 수확된 사천006, 두산12 호와 두산2002 종자를 인위노화시켜 종자세를 조절하였다. 이들 종자로서 표준발아검사(standard germination test), 저온발아검사(cold germi-nation test), 전기전도도검사(electroconductivity test)와 Tetrazolium 검사(TZ vigor test)를 실시하여 포장출아율 및 수량과의 관계를 구명하고자 하였다. 9가지 seed lot을 이용한 맥주보리의 포장출아율 예측에는 표준발아검사에서의 발아율만으로 65%의 예측효과가 인정되었고 표준발아검사에서의 유묘세와 저온발아검사에서의 유묘세와 발아율 parameter 또한 효과적인 방법임을 다중회귀분석으로 알 수 있었다. 수량 예측에는 TZ검사에서의 종자세 지수와 표준발아검사에서의 발아율과 TZ검사에서의 예측발아율이 효과적 인 parameter임을 알 수 있었다.

• 대한한의학회지
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• 제22권3호
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• pp.129-140
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• 2001

Objectives : The aim of this study was to evaluate the effects of Punsimgi-eum(fenxingi-yin) in rat model of depression induced by chronic mild stress (CMS). Methods : The change of the consumption of sucrose solution was measured, and the open field test and passive avoidance conditioning test were performed to investigate the anti-depressive effect of Punsimgi-eum(fenxingi-yin). Results : The results were as follows; I. The consumption of sucrose solution was significantly reversed in the test group at 5, 7 and 8 weeks, but there was no significant change in the control group. 2. There was no significant change of body weight after 8 weeks in each group 3. In the open field test, there was significant increase of exploratory activity in the test group. 4. In the passive avoidance test, the test group showed differences in the maintenance of retention from the control group at the 2-week training-testing interval. Conclusions : The present results suggest that Punsimgi-eum(fenxingi-yin) has an anti-depressive effect.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.468-476
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• 2007

Generally, the strength of the field shotcrete is heavily dependent on the field mixing and spraying conditions so that it is different from the strength of the shotcrete mixed in laboratories. As a support member, the early strength of shotcrete unlike concrete as structural material is very important to the initial stabilization of the excavation face in tunnels. Therefore, the field methods to efficiently test the early strength of shotcrete have been highly required. This paper aimed to verify the pneumatic pin penetration test and the point load test for measuring the early strength of the field shotcrete. Through a series of uniaxial compression, pin penetration, and point load tests for the range of the early shotcrete strength, two equations to estimate reliably the uniaxial compressive strength by the pin penetration and the point load tests were derived. Field tests in working tunnel were carried out in order to estimate the economic efficiency. As a result, pin penetration method was proved to be the most effective method for testing the early strength of the field shotcrete.