• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 가을 학술발표회 논문집
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• pp.241-264
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• 2001

Due to the variation of equipments and test procedure, level of energy transferred to split spoon sampler varies and thus measured N value. Since the properties and parameters are estimated from empirical correlations related to N value, the correction of N value with respect to specific energy level is essential. Factors affecting N value are discussed and the results of previous studies on energy correction of SPT N value is reviewed. Part of results from joint research works with KHC are presented and the range of energy levels for the hammer and release system typically used in Korea is suggested.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 가을 학술발표회 논문집
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• pp.293-298
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• 2001

N-value is usually used to assume the displacement depth of embankment on the soft marine clay. But N-value of the soft marine clay tend to underestimate unlike overestimating of general cases. In general case, if the length of rod is more long then N-value is more large because it is under the influence of energy loss of hammer blow. So it is reasonable to correct N-value down. But in the case of soft marine clay, N-value must not be correct down. Especially to assume the displacement depth of embankment on the soft marine clay, it must be used laboratory test results or CPT, Vane Test than N-value. In this study, it is compared with two field cases that design displacement method of embankment.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.211-216
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• 2005

Resonance of railroad bridge can be broken out when natural frequency of the bridge coincides with exciting frequency of moving forces. In order to avoid aforementioned unpleasant response of the structure, exact determination of dynamic structural properties is important to understand dynamic behavior of the structure under moving train loads. In the present paper, a 25 meters long full scale IPC girder and 15m Precom girder models were fabricated as a test specimen and modal testing was carried out to evaluate modal parameters including natural frequencies and modal damping ratios. In the modal testing, a digitally controlled vibration exciter as well as an impact hammer is applied to obtain frequency response functions more exactly and the modal parameters are evaluated varying with structural status.

• 설비공학논문집
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• 제12권8호
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• pp.782-790
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• 2000

A numerical study has been conducted to characterize the transient pressure in a building water supply system with an air chamber by utilizing a commercial code that employs the method of characteristics. Some results produced for the purpose of verification in the study agree quite well with the previously reported. Several parameters are then varied. Among them are the valve closure time, the wave speed, the static pressure, the polytropic exponent, the air chamber volume, the inner diameter and the shape of orifice in the air chamber, etc, while the water temperature and velocity are kept constant at $20^P{circ}C $,/TEX> and 0.8 m/s, respectively, Results reported in this parametric study may be useful to understand the unsteady behavior of the system.

• 한국공간구조학회논문집
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• 제7권1호
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• pp.55-62
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• 2007

곡선보의 고유진동수를 측정하기 우하여 이론적인 해석과 실험 및 유한요소법해석을 실시하였다. 본 논문에서는 모우드해석을 위한 실험에서 얻어지는 결과로부터 곡선보의 동특성의 하나인 고유진동수를 구하였다 먼저, 이론식을 통해 구조물의 동특성을 파악하고, 유한요소해석과 실험에 의한 결과를 비교 검토하여 구조물의 동적해석에 있어서 모우드해석법의 적용성을 보였다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 2003년도 한국생물과학협회 학술발표대회
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• pp.205.2-205
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• 2003

No Abstract, See Full Text

• 한국지반공학회지:지반
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• 제2권3호
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• pp.15-26
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• 1986

말뚝박기에서 항타지지력을 추정하기 위하여 수많은 항타공식이 널리 사용되고 있으나 말뚝의 지지력은 해머-말뚝-지반토의 복잡한 상호작용에 의하여 변화하기 때문에 어느 공식이 현장조건에 가장 적합한 공식이라 판단하기는 매우 어렵다. 본 연구에서는 파동이론과 말뚝의 잔류응력에 의하여 항타지지력을 해석하므로서 현장에서 간편하게 추정할 수 있는 신뢰도가 높은 산출식을 유도하여 이를 고찰하였다.

• 대한병원협회지
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• 제17권1.2호통권151호
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• pp.51-55
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• 1988

현재 우리나라의 모든 산업계에서는 컴퓨터시스팀을 도입하여 사무자동화(O.A;Office Automation)와 공장자동화(F.A;Factory Automation)등을 통하여 생력화는 물론 이에 관련된 제반 정보를 축적, 활용하여 경영의사결정에 이용되고 있다. 병원의 경우, 아무리 규모가 작더라도 타산업에 비할 수 없을 정도의 많은 정보가 생산되고 있으며 이렇게 생산된 정보를 사장시키지 않고 축적, 활용하기 위해서는 전산시스팀의 도입이 불가피하다. 그러나 실제로 시스팀 도입하기까지에는 기술적, 행정적으로 많은 문제점이 따르며 따라서 시스팀도입의 성공여부는 그 접근방법에 좌우된다고 할 수 있다. 다음은 1987년 3월호 'Hospital and Heathl Services Revew'지에 실린 영 Hammer smith and Queen Charlotte's SHA*의 사례로서 시스팀의 도입, 운영, 기타사항들을 소개하기로 한다.

• International Journal of Fluid Machinery and Systems
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• 제3권4호
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• pp.332-341
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• 2010

Standard dimensionless parameters cannot simultaneously represent all operation modes of a pump-turbine. They either have singularities at E=0 and multiple values in the 'unstable' areas, or else get singular at n=0. P. Suter (1966) introduced an alternative set of variables which avoids singularity and always remains unique-valued. This works for non-regulated pumps but not so well for regulated machines. A modification by C.S. Martin avoids distortion at low load. The present paper describes further improvements for the representation of torque, and for closed gate (where Suter's concept does not work). The possibility to interpolate across all operation modes is likewise useful for representing other mechanical parameters of the machine. Practical application for guide vane torque and pressure pulsation data is demonstrated by examples.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 춘계 학술논문 발표대회
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• pp.69-70
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• 2013

This is an foundational study to adequacy the non-destruction testing for the estimation of compressive strength of high strength concrete The results are as follows, In high strength concrete, H type is NR type rebound number rather than higher. The relation between rebound number and compressive strength of high strength concrete have lower coefficient. when compressive strength estimation of high strength concrete, it consider that rebound hardness test is not applied and should be consider to combined method or addition method.