• Title/Summary/Keyword: consolidation theory

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Prediction Method of Settlement Based on Field Monitoring Data for Soft Ground Under Preloading Improvement with Ramp Loading (점증 선행 하중으로 개량하는 연약지반의 계측기반 침하량 예측방법 개발)

  • Woo, Sang-Inn;Yune, Chan-Young;Baek, Seung-Kyung;Chung, Choong-Ki
    • Journal of the Korean Geotechnical Society
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    • v.24 no.10
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    • pp.83-91
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    • 2008
  • Previous settlement prediction methods based on settlement monitoring were developed under instantaneous loading condition and have restriction to be applied to soft ground under ramp loading condition. In this study, settlement prediction method under ramp loading was developed. New settlement prediction method under ramp loading considered influence factors of consolidation settlement such as thickness of clayed layer, quantity of surcharge load and preconsolidation pressure, etc. Geometrical correction method based on hyperbolic method (1991) and correction method based on probability theory were applied to increase accuracy of settlement prediction using field monitoring data after ramp loading. Large consolidation tests for ideally controlled one dimensional consolidation under ramp loading condition were performed and the settlement behavior was predicted based on the monitoring data. New prediction method yielded good result of entire settlement behavior by using data during an early stage of ramp load. Additionally, new prediction method offered better settlement prediction which had final settlement prediction in close proximity and low RMSE(Root Mean Square Error) than previous method such as hyperbolic method did.

Analysis of Consolidation and Shear Characteristics for the Kwangyang Bay Clay (실내시험을 통한 광양만 점토의 압밀 및 전단특성분석)

  • 이영휘;김용준;김대길
    • Journal of the Korean Geotechnical Society
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    • v.15 no.1
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    • pp.151-160
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    • 1999
  • A series of laboratory tests for the marine clay sampled under the sea of Kwangyang bay have been conducted. The main types of tests are the general index property tests, the oedometer tests and the triaxial compression tests in both undrained(CIU) and drained(CID) conditions. The clayey samples, classified as CL, CH with natural water content of 38.3~84.6% and liquidity index of 0.71~0.98, are in the normally consolidated state with O.C.R. of 1.0l~l.60. The undrained stress path from CIU tests can be normalized with isotropic consolidation pressure$(p_0)$ and equal shear strain contour is linear passing through the origin in the (q, p) plot. The undrained shear strain is found to be the only function of the stress ratio($\eta$) and linear with intercept in the ($\varepsilon/\eta,\eta$) plot. The built-up pore pressure normalized with pc is also linear with respect to $\eta$. and its slope is defined by ´C´ as a pore pressure parameter. Equations to predict the undrained stress path and the shear strain are proposed. It is proved that the proposed equations give better agreements to the measured values than the Cam-clay theories. The failure points of the stress path are located on the same C.S.L. in (q, p) plot during both CIU and CID tests, which justifies the concept of critical state theory.

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Revisiting the Concept of Suture in Lacanian Film Criticism (라캉주의 영화비평에서 봉합이론의 재고찰)

  • Kim, Jiyoung
    • Journal of English Language & Literature
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    • v.58 no.4
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    • pp.565-588
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    • 2012
  • This paper aims at reconsidering 'suture,' a key concept in early Lacanian film criticism, with a view to narrowing a supposed gap between early Lacanian and later Lacanian film criticism. Early Lacanian film theorists, among whom Jean-Pierre Oudart, Jean-Louis Baudry, Laura Mulvey and Daniel Dayan, to name a few, are prominent, focus on cinematic signifying system as well as its ideological effects on shaping subjectivity of the audience. Initiated by Jacques-Alain Miller's article on suture as the logic of signifier and grafted into film as the logic of the cinematic by Oudart's writing, the concept of suture was established as a key word in early Lacanian film criticism. In their taxonomy, suture refers to the processes by which the audience are stitched into the story-world of a film. The audience are drawn into the film and take up positions as subjects-within-the-film such that they make sense of and respond to what the film represents as they are encouraged to do so by the film itself. On the other hand, later Lacanian film critics, who are much influenced by Lacan's later emphasis on the Real, focus on concepts such as gaze, petit objet a, fantasy, rather than suture. They are more concerned with the failure of suture and the disruption of the Symbolic than the ideological effects of suture and the consolidation of the Symbolic. They require a break from the previous approach of Lacanian film theory which centers around the Imaginary and the Symbolic. However, early Lacanian and later Lacanian film theory do not manifest as much disparity as they are supposed to do, for both are against the ideological manipulation of suture. Slavoj Žižek, a leading scholar of later Lacanian psychoanalysis, revives the concept of suture as a patch of the Symbolic which covers the gap, if not always successful.

Role Adaptation Process of Elementary School Health Teachers: Establishing Their Own Positions (초등학교 보건교사의 역할적응 과정: 자기자리 만들어 가기)

  • Lee, Jeong Hee;Lee, Byoung Sook
    • Journal of Korean Academy of Nursing
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    • v.44 no.3
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    • pp.305-316
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    • 2014
  • Purpose: The purpose of this study was to explore and identify patterns from the phenomenon of the role adaptation process in elementary school health teachers and finally, suggest a model to describe the process. Methods: Grounded theory methodology and focus group interviews were used. Data were collected from 24 participants of four focus groups. The questions used were about their experience of role adaptation including situational contexts and interactional coping strategies. Transcribed data and field notes were analyzed with continuous comparative analysis. Results: The core category was 'establishing their own positions', an interactional coping strategy. The phenomenon identified by participants was confusion and wandering in their role performance. Influencing contexts were unclear beliefs for their role as health teachers and non-supportive job environments. The result of the adaptation process was consolidation of their positions. Pride as health teachers and social recognition and supports intervened to produce that result. The process had three stages; entry, growth, and maturity. Conclusion: The role adaptation process of elementary school health teachers can be explained as establishing, strengthening and consolidating their own positions. Results of this study can be used as fundamental information for developing programs to support the role adaptation of health teachers.

A Study on the Estimation of Loss Rate of Dredged Fills (준설토의 유실률 평가에 관한 연구)

  • Kim, Hong-Taek;Kim, Seog-Yeol;Kang, In-Kyu;Park, Jae-Eock
    • Journal of the Korean GEO-environmental Society
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    • v.1 no.1
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    • pp.57-63
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    • 2000
  • Volume change of the dredged soils is composed of loss amount of the soil particles flowing over an outflow weir with water and settlements due to both the self-weight consolidation in reclaimed layer and the desiccation at the surface of reclaimed layer. In order to estimate the amount of soil particles flowing over an outflow weir with water, the breakage theory and the results of hydrometer analyses. To verify a validity of the proposed procedure, evaluated loss ratio is compared with various estimates from the other existing methods.

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Characteristic of stress and strain of soft ground applied individual vacuum pressure (개별진공압이 적용된 연약지반의 응력과 변형 특성)

  • Ahn, Dong-Wook;Han, Sang-Jae;Kim, Byung-Il;Jung, Seung-Yong;Kim, Soo-Sam
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.467-472
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    • 2010
  • Individual vacuum pressure method is soft ground improvement technique, in which a vacuum pressure can be directly applied to the vertical drain board to promote consolidation and strengthening the soft ground. This method does not require a surcharge load, different to embankment or pre-loading method. In this study, given the inner displacement of the ground where the individual vacuum pressure is applied, this dissertation aimed to reproduce the state of stress in the ground that is subject to the constraints created by the depth of improvement area. Modified Cam Clay theory which made it possible to take into account the isotropic displacement of the ground was applied to the NAP-IVP used simulation; the conception of equivalent permeability proposed by Hird was also applied so that the 3-dimensional real construction effect of drain materials could be reflected in the analysis.

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Comprehensive Aeromechanics Predictions on Air and Structural Loads of HART I Rotor

  • Na, Deokhwan;You, Younghyun;Jung, Sung N.
    • International Journal of Aeronautical and Space Sciences
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    • v.18 no.1
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    • pp.165-173
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    • 2017
  • The aeromechanics predictions of HART I rotor obtained using a computational structural dynamics (CSD) code are evaluated against the wind tunnel test data. The flight regimes include low speed descending flight at an advance ratio of ${\mu}=0.151$ and cruise condition at ${\mu}=0.229$. A lifting-line based unsteady airfoil theory with C81 table look-up is used to calculate the aerodynamic loads acting on the blade. Either rolled-up free wake or multiple-trailer wake with consolidation (MTC) model is employed for the free vortex wake representation. The measured blade properties accomplished recently are used to analyze the rotor for the up-to-date computations. The comparison results on airloads and structural loads of the rotor show good agreements for descent flight and fair for cruise flight condition. It is observed that MTC model generally improves the correlation against the measured data. The structural loads predictions for all measurement locations of HART I rotor are investigated. The dominant harmonic response of the structural loads is clearly captured with MTC model.

Fast analytical estimation of the influence zone depth, its numerical verification and FEM accuracy testing

  • Kuklik, Pavel;Broucek, Miroslav;Kopackova, Marie
    • Structural Engineering and Mechanics
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    • v.33 no.5
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    • pp.635-647
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    • 2009
  • For the calculation of foundation settlement it is recommended to take into account so called influence zone inside the subsoil bellow the foundation structure. Influence zone inside the subsoil is the region where the load has a substantial influence on the deformation of the soil skeleton. The soil skeleton is pre-consolidated or over consolidated due to the original geostatic stress state. An excavation changes the original geostatic stress state and it creates the space for the load transferred from upper structure. The theory of elastic layer in Westergard manner is selected for the vertical stress calculation. The depth of influence zone is calculated from the equality of the original geostatic stress and the new geostatic stress due to excavation combined with the vertical stress from the upper structure. Two close formulas are presented for the influence zone calculation. Using ADINA code we carried out several numerical examples to verify the proposed analytical formulas and to enhance their use in civil engineering practice. Otherwise, the FEM code accuracy can be control.

Enhanced Stabilization of Carcasses by Retrofitting Burial Sites to Bioreactor (매몰지 생물반응조 개조를 통한 사체의 안정화 촉진)

  • Kim, Geonha;Jeon, Haeseong
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.10
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    • pp.679-684
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    • 2014
  • Many burial sites were constructed to suppress the spread of foot and mouth disease during outbreak. Defected burial sites were removed when leachate leak is presumed and carcasses were moved to the circular storage tanks. However, carcasses were not decomposed possibly due to low water content, low microbial activities, and poor mixing. In this research, storage tank containing carcasses in it was modified to bioreactor to accelerate stabilization. Liquids with nutrients were added and circulated to maintain the optimum water content while extraneous microorganisms were augmented. Settlement was used as the primary index for assessing stabilization rate, and the consolidation theory was utilized to estimate the expected final settlement. 30% of carcasses is expected to be decomposed and removed from the storage tank for five years of bioreactor operation.

A Case Study on the Improvement of General Hospital Outpatients Waiting Time using TOC Methodology (제약이론(TOC)을 이용한 종합병원 외래 환자 대기시간 개선에 대한 연구)

  • Park, Chan-Seok;Koh, Seok-Ha
    • Korea Journal of Hospital Management
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    • v.16 no.1
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    • pp.77-100
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    • 2011
  • The purpose of this study is to the improvement of general hospital outpatients waiting time using Theory Of Constraints(TOC) methodology and to the development of a Reception Desk in general hospital. This study is to provide decision-making guidelines for hospital managers and to provide feedback for the efficiency of job process. The target people of the study are outpatients and Cashiers on Chungnam national university hospital in Daejeon. The methods of study are summarized as follows. First, The team managers from a Reception Desk group were appointed. This team managers have the adjustment authority to the Outpatients schedule of doctor and Cashier members. Second, The consolidation of the general Reception desk and special inspection the Reception Desk. A movement line and waiting time of patients were simple and fast to accept. As a result of study, it shows that the TOC is the method for a job process and waiting time improvement, patients' satisfaction increase and we need an objective measurement indexes in the medical treatment industry.

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