• 지구물리와물리탐사
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• 제13권1호
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• pp.24-30
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• 2010

본 연구는 시간차 탄성파 탐사에 대한 천부지하구조의 영향을 분석하기 위해 반복적인 수치모형실험을 이용하였다. 수치 실험의 목적은 Otway 분지에 있는 Naylor 지역에서 $CO_2$ 격리를 목적으로 수행 된 현장 실험에서 관찰된 주요한 산란파들을 재생성하는 것이다. 특히, 수포화도를 변화시켜 가면서 상부토양과 심부의 주름진 점토/석회암 경계면의 탄성 성질들의 변화를 관찰하였다. 이러한 실험을 통해서 건기 빛 우기 계절에 행해진 측정치를 모사하였고, 계절의 변화가 탄성파 측정에 미치는 영향을 비반복성 관점에서 평가하였다. 이 영향들에 대한 정량화와 각각의 기여도를 측정하기 위해서 탄성파 파동방정식을 이용한 수치모델링이 수행되었다. 수치모델링 결과는 천부의 점토/석회암의 주름진 경계면에서의 상대적으로 간단한 분산 효과등이 시간차 탐사에 대한 상당한 영향을 미침을 보여주었다. 또한, 상부 토양에서의 포화도의 변화는 심지어 심부의 주름진 경계면보다도 더 탄성파 신호에 잠재적으로 영향을 미칠 수 있다. 현장에서 측정된 반복된 (시간차) 2차원 탄성파탐사 자료들 사이의 정규화원 RMS(Root-mean-square) 차이와 수치적으로 계산된 차이와의 전체적인 일치는 더 많은 연구가 필요함을 알 수 있다. 향후 진행될 연구는 micro VSP 배영과 매우 조밀한 굴절법 탐사를 이용해서 풍화 지역의 탄성 성질을 현장에서 측정하는 것이다. 본 연구의 결과는 중풍이냐 호주와 같이 카르스트 지형으로 생산에 어려움이 따르는 지역의 석유 생산 영상화와 같은 $CO_2$ 지중격리와 상관이 없는 분야에도 효과가 있을 것이다.

• Journal of Periodontal and Implant Science
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• 제29권2호
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• pp.415-433
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• 1999

Implant stability is the key to long-term successful outcome for osseointegrated implants. To evaluate the initial healing response of bone around HA-coated implants without primary bone contact. 21 HA-coated thread type implants(STERI-OSS?) were placed in the femurs of 5 mongrel dogs, about 1-year old. Implants, 8 mm in length and 3.8mm(experimental 1group), 5.0mm(experimental 2group) and 6.0mm(control group) in diameter, were inserted after 3 holes of 6.0mm in diameter and 10mm in depth were prepared in the surgical sites each dog. Implants were supported by only nonresorbable membrane($Teflon^{(R)}$), in order to prevent the ingrowth of upper soft tissue into the gap between bone and implant, and to maintain each implant to be positioned in the center of the drilled hole. 9 implants with different diameters were inserted in 3 dogs for histologic observation, and 12 implants were inserted in 2 dogs for mobility test and removal torque test. Fluorescent dyes were injected for the observation of new bone formation in order of $Terramycin^{(R)}$, Arizarin $Red^{(R)}$, and $Calcein^{(R)}$ at an interval of 2 weeks. 3 dogs were sacrificed for histologic observation at 4, 8, and 12-week after placement. Light microscopy and confocal laser scanning microscopy were used to qualitatively characterize the bone around HA-coated implant. 2 dogs were sacrificed for mobility test($Periotest^{(R)}$, Simens AG, Bensheim, Germany) and removal torque test($Autograph^{(R)}$ AGS-1000D series, Japan) at 8 and 12-week after placement The results were as follows: 1. Histologic observation showed that osseointegration occurred to both control and experimental groups as time lapse, but delayed bone healing was revealed in 3.8mm group (experimental 1group), compared to contrtol group and 5.0mm group (experimental 2group). 2. The mobility test showed that the experimental groups had no distinguishable movement during experimental periods of 8 and 12-week, and there was no difference in mobility depending on the gap between bone and implant, and time lapse. 3. The removal torque forces were increased depended on the gaps decreasing between bone and implant, and time lapse. The results suggest that HA-coated implant without primary bone contact, based on guided bone regeneration could obtain its stability in all experimental groups as time lapse, but bone healing was delayed in experimental group of 3.8mm. And the results suggested that studies on correlationship between mobility test and removal torque test for implant stability would be necessary.

• 지구물리와물리탐사
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• 제17권2호
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• pp.104-113
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• 2014

간척지의 연약지반 평가를 위해 전기비저항 모니터링을 실시하여 물리탐사기법의 적용성을 알아보고자 총 3개월에 걸쳐 전기비저항 모니터링 자료를 획득하였고, 이 자료들을 독립역산, 시간경과 역산, 4D 역산법으로 해석을 실시하였다. 본 연구에서는 각 역산 방법들의 비교를 통해 연약지반의 변화 특성을 잘 나타낼 수 있는 역산방법을 파악하고자 하였다. 또한, 시추자료와 콘 관입시험(Cone Penetration Test; CPT) 자료를 이용하여 각 역산방법들이 기반암과 연약지반을 명확히 구분 하는지 알아보았다. 시간경과 역산의 경우 독립역산 보다 역산 잡음이 감소하여 연약지반을 잘 반영한다는 것을 알 수 있었다. 4D 역산은 3개월 데이터 보다 장기의 데이터를 사용하면 시간경과 역산법보다 효율적인 해석방법이 될 수 있음을 파악하였다. 연약지반에서의 전기비저항 모니터링은 지반의 시공간적 전기적 상태를 연속적으로 분석 할 수 있는 유용한 방법임을 확인하였다.

• 한국지반공학회지:지반
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• 제11권3호
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• pp.5-16
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• 1995

본 연구에서는 석탄회를 성토재로 활용시 침출 시간경과에 따른 석탄회 침출수의 성분 및 농도변화 특성을 파악하므로써 주변환경에 미치는 영향을 평가하기 위해 비회 및 혼합회를 대상으 로한 연속식 용출시험과 회분식 용출시 험을 수행하고 시험 결과를 수질기준과 비교, 검토하였다. 시험결과, 대상 석탄회는 일반 폐기물로 분류되었으며,석탄회 침출수의 농도는 시간경과에 따라 급격히 감소하여 일정시간 경과후에는 극히 미미하게 나타났다. 또한 대상석탄회 침출수의 수질은 pH를 제외한 기타 성분들이 모두 음용수 수질기준과 폐수배출 허용기준을 만족하는 것으로 나타났다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.1071-1074
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• 2008

In this study, the behavior of dredged soil was measured by repeated tide and analyzed the change of settlements and cone penetration resistance by centrifuge model about dredged soil of Kunsan-Janghang site that maximum tidal range is 7.4m. Consequently the settlements of dredged soil by repeated tide in the 2nd month was 0.489 m. After 12th month, the total settlements was 0.524 m in the model. It meaned the settlements of dredged soil by repeated tide in the 2th month was 80% of the settlements. Also, with the lapse of time, cone penetration resistance increased centrifuge model test for catching the strength change of dredged soil by repeated tide. After 10th month, there were not almost changes. cone penetration resistance in 10th month was measured more 3.5~5.6 times than that in its early stages. Also, with the lapse of time, cone penetration resistance increased almost linearly. And, when we surveyed the relation between cone penetration resistance and time, as depth increased, cone penetration resistance rose.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2011년도 학술대회 및 정기총회
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• pp.189-192
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• 2011

• 한국운동역학회지
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• 제17권2호
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• pp.61-73
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• 2007

The purpose of this study was to investigate the influence of the muscular endurance on the kinematic factors during a prolonged run. Subjects, 12 males, who were divided into three groups(lower group, general group, and in higher group) after measuring the lower limb's muscular endurance previously. They were asked toe run on the treadmill at 7.4km/h of speed. To analyze the kinematics parameters of the trunk during running, the ProReflex MCU Camera(Qualisys, Sweden) were used. All parameters were sampled from 5 minute, 40 minute, and 60 minute moments during running. An ANOVA with Repeated Measure was used to test the statistic significance between and within groups for all parameters determined with SPSS 11.0. Significance was defined as p<.05. The conclusions were as follows; There was significantly difference within(lapse of running time) groups in the take-off and minimum knee angle event of swing phase of the trunk flexion and extension. In conclusion, the muscular endurance affected on movement of the trunk during a prolonged run. In addition, it showed that there was significant difference in the energy consumption by lapse of running time. Therefore, it seems to be relationships between the muscular endurance and running efficiency.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2007년도 공동학술대회 논문집
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• pp.173-178
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• 2007

Time-lapse electrical resistivity measurements have been made in a scale model experiment for geological $CO_2$ sequestration in aquifer. Three types of $CO_2$ injection are tested in a water tank filled with glass beads. These are $CO_2$ dissolved into filtered tap water, $CO_2$ gas, and mineral oil. The mineral oil is a substitute for liquid phase of supercritical $CO_2$. For reconstructing three-dimensional resistivity images, we measure potential differences at 32 potential dipoles on the top surface of the tank due to two current dipoles on the front and back sides. The resultant resistivity images clearly show the movement of injected $CO_2$ in aquifer.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2007년도 특별 심포지엄 논문집
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• pp.15-25
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• 2007

Gravity method could be one of the most effective tool for evaluating the soundness of basement which is directly correlated with density and its variations. Moreover, Gravimeter is easy to handle and strong to electromagnetic noises. But, gravity anomaly due to the target structures in engineering and environmemtal applications are too small to detect, comparing to the external changes, such as, elevation, topography, and regional geological variations. Gravity method targeting these kinds of small anomaly sources with high precision usually called microgravity. Microgravimetry with precision and accuracy of few ${\mu}Gal$, can be achieved by the recent high-resolution gravimeter, careful field acquisition, and sophisticated processing, analysis, and interpretation routines. This paper describes the application of the microgravity, such as, density structure of a rock fill dam, detection of abandoned mine-shaft, detection and mapping of karstic cavities in limestone terrains, and time-lapse gravity for grout monitoring. The case studies show how the gravity anomalies detect the location of the targets and reveal the geologic structure by mapping density distributions and their variations.

• 대한물리치료과학회지
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• 제27권3호
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• pp.45-55
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• 2020

Background: The purpose of this study was to investigate the effects of WBC (whole-body cryotherapy)on the MVIC (maximal voluntary isometric contraction)and active ROM (range of motion) recovery of after EIMD (exercise-induced muscle injury). Design: Randomized Controlled Trial. Methods: Thirty subjects who are student in their 20s at a university participated in this study, these subjects were assigned into three groups, a control group (n=10), experiment group I(n=10), and experiment group II (n=10). The subjects in the experimental group II were intervened by WBC (-130℃, 3 minutes) before induced EIMD, the experimental group were intervened by WBC (-130℃, 3 minutes) after induced EIMD, and the control group weren't by any intervened after induced EIMD. Results: First, In the comparison of the MVIC, there were significant variations with the lapse the time in three groups (p<.001) and there was a significant interaction of time and group (p<.001). In the among group comparison, the MVIC of experimental group II was significantly larger than those of other groups (p<.001). Second, In the comparison of the active extension angle, there were significant variations with the lapse the time in three groups (p<.001) and there was a significant interaction of time and group (p<.001). In the among group comparison, the active extension angle of experimental group II was significantly smaller than those of other groups (p<.001). Third, In the comparison of the active flexion angle, there were significant variations with the lapse the time in three groups (p<.01) and there was a significant interaction of time and group (p<.001). In the among group comparison, the active flexion angle of experimental group II was significantly larger than those of other groups (p<.05). Conclusion: The above results revealed that the WBC intervention after an exercise had a positive effect of muscle function after EIMD. Therefore we can consider the WBC as a considerable intervention method to prevent or reduce an exercise injury.