• Title, Summary, Keyword: SPT

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Quality Evaluation by Automatic Recording System of SPT (표준관입시험(SPT)의 자동기록장치에 의한 품질평가)

  • Kim, Jong-Kook;Kang, In-Jung;Kim, Khi-Woong;Chae, Young-Soo
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1425-1434
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    • 2009
  • This study was aimed at comparing and assessing SPT-N values both measured by automatic and manual record devices of Standard Penetration Test. As a result, energy efficiency of hammer was approximately 62.9%, meaning SPT-N value measured by automatic recording device showed relatively accurate performance that the one done by manual device. Given the relations between hit frequency of automatic recording device and intrusion, the characteristics of stratum are expected to be proved in more accurate way. Additionally, higher confidence level seems to make it preferred and quality assessment method.

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A Comparative Study on Borehole Seismic Test Methods for Site Classification

  • Jung, Jong-Suk;Sim, Youngjong;Park, Jong-Bae;Park, Yong-Boo
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.3 no.4
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    • pp.389-397
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    • 2012
  • In this study, crosshole seismic test, donwhole seismic test, SPT uphole test, and suspension PS logging (SPS logging) were conducted and the shear wave velocities of these tests were compared. The test demonstrated the following result: Downhole tests showed similar results compared to those of crosshole tests, which is known to be relatively accurate. SPS logging showed reliable results in the case of no casing, i.e. in the rock mass, while, in the case of soil ground, its values were lower or higher than those of other tests. SPT-uphole tests showed similar results in the soil ground and upper area of rock mass compared to other methods. However, reliable results could not be obtained from these tests because SPT sampler could not penetrate into the rock mass for the tests.

Development of Protein Secretion System using Type III Secretion System of Salmonella (Salmonella Type III Secretion System을 이용한 단백질 분비시스템 개발)

  • Dinh, Le Tam Vo;Hong, Soon-Ho
    • KSBB Journal
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    • v.24 no.4
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    • pp.393-396
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    • 2009
  • New protein secretion system was developed using Type III Secretion System of Salmonella. N-terminal region of SlrP and SptP effector proteins were fused with TliA and EstA-P lipases by overlapping PCR. Lipase activity of Salmonella with SptP-TliA fusion system increased by 2.6 fold compare with wild type Salmonella strain. This result showed that lipase secretion via the T3SS would be a useful protein secretion machinery.

A Study on Beam Error Method of Coherent Interference Signal Estimation using Optimum Covariance Weight Vector (최적 공분산 가중 벡터를 이용한 상관성 간섭 신호 추정의 빔 지향 오차)

  • Cho, Sung Kuk;Lee, Jun Dong;Jeon, Byung Kook
    • Journal of the Korea Society of Digital Industry and Information Management
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    • v.10 no.4
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    • pp.53-61
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    • 2014
  • In this paper, we proposed covariance weight matrix using SPT matrix in order to accurate target estimation. We have estimated a target using modified covariance matrix and beam steering error method. We have minimized beam steering error in order to estimation desired a target. This method obtain optimum covariance weight using modified SPT matrix. This paper of proposal method is showed good performance than general method. We updated a weight of covariance matrix using modified SPT matrix. We obtain optimum covariance matrix weight to application beam steering error method in order to beam steering toward desired target. Through simulation, we showed that compare proposal method with general method. It have improved resolution of estimation target to good performance more proposed method than general method.

Evaluation of Shear Wave Velocity Profiles by Performing Uphole Test Using SPT (표준관입시험을 이용한 업홀시험에서 전단파 속도 주상도의 도출)

  • 김동수;방은석;서원석
    • Journal of the Korean Geotechnical Society
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    • v.19 no.2
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    • pp.135-146
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    • 2003
  • Uphole test is a seismic field test using receivers on ground surface and a source in depth. In this paper, the uphole test using SPT(standard penetration test) which is economical and reliable for obtaining shear wave velocity profile was introduced. In the proposed uphole test, SPT sampler which is common in site investigation, was used as a source and several 1Hz geophones in line were used as receivers. Test procedures in field and interpretation methods for obtaining interval times and for determining shear wave velocity profile considering refracted ray path were introduced. Finally, uphole test was performed at three sites, and the applicability of the proposed uphole test was verified by comparing wave velocity profiles determined by the uphole test with the profiles determined by downhole test, SASW test and SPT-N values.

Analytical Studies for Application of SPT Dynamic Signals to Estimate the Elastic Property of the Soil Deposit (표준관입시험의 동적신호를 이용한 지반 물성치 추정의 해석적 연구)

  • 이병식;김영수
    • Journal of the Korean Geotechnical Society
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    • v.18 no.4
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    • pp.167-177
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    • 2002
  • A test method has been attempted to estimate the soil stiffness by measuring and analyzing dynamic signals of stress waves reflected at the bottom end of the SPT rod contacting a soil deposit. Before conducting a real size testing, a series of parametric studies were conducted in this paper to examine the applicability and the theoretical adequacy of the test method. As a result of these studies, it has been shown that the most significant influence factor affecting the amplitude ratio of the reflected wave to the incident wave at the rod-soil interface was the variation of soil stiffness. Also, the variation of the amplitude ratio was found to be closely related with the variation of impedance ratio of the soil deposit to the SPT rod. As a result, a potential of the test method could be proved to estimate the impedance and the elastic modulus of the soil deposit interfaced with the SPT rod using the test method.

A Design of Solar Proton Telescope for Next Generation Small Satellite

  • Sohn, Jongdae;Oh, Suyeon;Yi, Yu;Min, Kyoung-Wook;Lee, Dae-Young;Seon, Jongho
    • Journal of Astronomy and Space Sciences
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    • v.29 no.4
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    • pp.343-349
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    • 2012
  • The solar proton telescope (SPT) is considered as one of the scientific instruments to be installed in instruments for the study of space storm (ISSS) which is determined for next generation small satellite-1 (NEXTSat-1). The SPT is the instrument that acquires the information on energetic particles, especially the energy and flux of proton, according to the solar activity in the space radiation environment. We performed the simulation to determine the specification of the SPT using geometry and tracking 4 (GEANT4). The simulation was performed in the range of 0.6-1,000 MeV considering that the proton, which is to be detected, corresponds to the high energy region according to the solar activity in the space radiation environment. By using aluminum as a blocking material and adjusting the energy detection range, we determined total 7 channels (0.6~5, 5~10, 10~20, 20~35, 35~52, 52~72, and >72 MeV) for the energy range of SPT. In the SPT, the proton energy was distinguished using linear energy transfer to compare with or discriminate from relativistic electron for the channels P1-P3 which are the range of less than 20 MeV, and above those channels, the energy was determined on the basis of whether silicon semiconductor detector (SSD) signal can pass or not. To determine the optimal channel, we performed the conceptual design of payload which uses the SSD. The designed SPT will improve the understanding on the capture and decline of solar energetic particles at the radiation belt by measuring the energetic proton.

Rod Energy Ratio Measurement of SPT (표준관입시험의 동적효율 측정)

  • Lee, Ho-Chun;Kim, Byeong-Il;Park, Yong-Won
    • Geotechnical Engineering
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    • v.13 no.1
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    • pp.169-182
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    • 1997
  • It is known that some amount of loss in impact energy takes place due to some limitations and problems during the performance of the field SPT. Actual energy level tractsferred to the rod should be measured to correct the SPT-N values tested in the field In this paper, the ratio of energy transferred to the rod through the anvil to impact energy is measured by using sharpy impact test equipment and also analysed by using GRL-WEAP This result is certified and compared with that of field SPT As the results of this study, the average rod energy ratio of the R-P hammer and the Trip hammer is calculated at 0.726 and 0.728 respectively, but it is suggested that 0.72 should be used. By using the hammer energy ratio 64.2% and 75.0% obtained from field measurement, the average energy ratio of the SPT for the R-P hammer is calculated at 46.7% and 54.5% for the Trip hammer.

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Shear Strength and Compressibility of Oyster Shell-Sand Mixtures for Sand Compaction Pile (SCP공법 적용을 위한 굴패각-모래 혼합토의 전단과 압축특성)

  • Yoon Gil-Lim;Yoon Yeo-Won;Chae Kwang-Seok;Kim Jae-Kwon
    • Journal of the Korean Geotechnical Society
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    • v.20 no.9
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    • pp.17-23
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    • 2004
  • Strength and deformation characteristics of oyster shell-sand mixtures were investigated to utilize waste oyster shell being treated as a waste material. Standard penetration test (SPT) is a common method to obtain in-situ strength in sand. However, in case of oyster shell-sand mixtures, there was no information between SPT N-value and internal friction angle of mixture soils. In this paper SPT experiments from several large scaled model chamber tests and large scaled direct shear tests were carried out with varying unit weight of oyster shell-sand mixtures. Appropriate correlations were in tile study observed among N-value, unit weight and internal friction angle, which make it possible to estimate in-situ strength from SPT and the coefficient of volume compressibility from the confined compression tests to compute the settlement of oyster shell-sand mixtures.

Standard Penetration Test Performance in Sandy Deposits (모래지반에서 표준관입시험에 따른 관입거동)

  • Dung, N.T.;Chung, Sung-Gyo
    • Journal of the Korean Geotechnical Society
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    • v.29 no.10
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    • pp.39-48
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    • 2013
  • This paper presents an equation to depict the penetration behavior during the standard penetration test (SPT) in sandy deposits. An energy balance approach is considered and the driving mechanism of the SPT sampler is conceptually modeled as that of a miniature open-ended steel pipe pile into sands. The equation consists of three sets of input parameters including hyperbolic parameters (m and ${\lambda}$) which are difficult to determine. An iterative technique is thus applied to determine the optimized values of m and ${\lambda}$ using three measured values from a routine SPT data. It is verified from a well-documented record that the simulated penetration curves are in good agreement with the measured ones. At a given depth, the increase in m results in the decrease in ${\lambda}$ and the increase in the curvature of the penetration curve as well as the simulated N-value. Generally, the predicted penetration curve becomes nearly straight for the portion of exceeding the seating drive zone, which is more pronounced as soil density increases. Thus, the simulation method can be applied to extrapolating a prematurely completed test data, i.e., to determining the N value equivalent to a 30 cm penetration. A simple linear equation is considered for obtaining similar results.