• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1081-1089
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• 2008

Highly plastic clays in their normally consolidated state are not linear but are concave upwards. Thus their compression index deceases with the increase in consolidation pressure. Likeness the e - log ${\sigma}\;_{\upsilon}\;'$ curves of the silts are not linear but are convex upwards. In this paper, conducted consolidation test with four undisturbed field soil and found that their e - log ${\sigma}\;_{\upsilon}\;'$ plots are not linear. And analyzed difference of settlement between computed value with compression index($C_c$) and computed value with improved compression index($\mathbb{C}$).

• 대한인간공학회지
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• 제31권2호
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• pp.337-343
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• 2012

Objective: The aim of this study was to determine the effect of abdominal-compression belt in one leg standing on balance in normal adult. Background: With the effects of increased intra-abdominal pressure, the abdominal-compression belt is contributing to a static balance control. However, specific study is still insufficient. Method: Forty subjects were randomly allocated to two groups: control(n=20) and experimental group(n=20), respectively. The experimental group used an abdominal-compression belt, whereas the control group did not that. All subjects were educated using pressure biofeedback unit and ultrasound imaging for exact application by abdominal-compression belt. Main outcome measurement was used a general stability index, fourier harmony index, weight distribution index, and fall index in tetrax balance system. Results: Experimental group improved significantly on general stability, only 2 factors(eyes closed with head turned forward and eyes closed with head turned backward) among fourier harmony index, and fall index, However, weight distribution index did not revealed significant difference. Conclusion: The findings suggest that application of abdominal-compression belt could be effective on improving balance ability in one leg standing of normal adults. Application: The results of the abdominal-compression belt might help to control balance in workers.

• 한방재활의학과학회지
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• 제27권4호
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• pp.147-154
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• 2017

The purpose of this study is to report the effectiveness of Fire needling therapy in patients with a vertebral compression fracture. Three patients with a acute vertebral compression fracture were treated using Fire needling therapy. To evaluate the effectiveness of Fire needling therapy, we checked Numerical rating scale on a daily and Oswestry disability index on admission and discharge. Numerical rating scale decreased as the number of Fire needling therapy increased. Oswestry disability index on discharge improved compared to admission. The limitation of this study is the insufficient number of cases and outcome measurements. Further studies are needed to prove effect and safety.

• 산업기술연구
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• 제25권A호
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• pp.57-65
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• 2005

In this paper, for the highly plastic marine soft clay distributed in west and southern coast of Korean peninsula of Kwangyang and Busan New Port areas, correlation between compression index and other indices representing geotechnical engineering properties such as liquid limit, void ratio and natural water content were analyzed. Appropriate empirical equations of being able to estimate the compressibility of clays in the specific areas were proposed and compared with other existing empirical ones. For analyses of the data and test results, data for marine clays were used from areas of the South Container Port of the Busan New Port, East Breakwater, Passenger Quay, Jungma Reclamation and Reclamation Containment in the 3rd stage in Kwangyang. In order to find the best regression model by using the commercially available software, MS EXCEL 2000, results obtained from the simple linear regression analysis, using the values of liquid limit, initial void ratio and natural water content as independent variables, were compared with the existing empirical equations. Multiple linear regression was also performed to find the best fit regression curves for compression index and other soil properties by combining those independent variables. On the other hands, another software of SPSS for non-linear regression was used to analyze the correlations between compression index and other soil properties.

• 한국전기전자재료학회논문지
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• 제28권11호
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• pp.748-751
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• 2015

Sound Masking System technology as by sound the same on all bands and artificially generates a constant sound shield People want to hear or recognize the people with the noise generated from the interior of the way. Prevent hearing or prevent recognition by using the technology to control the audible frequency band Continue to emit constant and uniform shielding sound audible frequency band Even the security content of speech (20 Hz~20 KHz). That interception laser eavesdropping, internal solicitations, during recording Or delay the decoding was a result of the effect of interference calculated Experience noise disturbance index is applied around the Stress Index is the average index is 10.16 was a luxury for the average index is then applied to the index 3.07 Noise is significantly lower stress level has improved noise conditions.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.446-449
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• 2002

This paper represents a improved data compression algorithm of mixed text file by 2 byte completion Hangout and 1 byte alphabet from. Original LZW algorithm efficiently compress a alphabet text file but inefficiently compress a 2 byte completion Hangout text file. To solve this problem, data compression algorithm using 2 byte prefix field and 2 byte suffix field for compression table have developed. But it have a another problem that is compression ratio of alphabet text file decreased. In this paper, we proposes improved LZW algorithm, that is, compression table in the Extended LZW(ELZW) algorithm uses 2 byte prefix field for pointer of a table and 1 byte suffix field for repeat counter. where, a prefix field uses a pointer(index) of compression table and a suffix field uses a counter of overlapping or recursion text data in compression table. To increase compression ratio, after construction of compression table, table data are properly packed as different bit string in accordance with a alphabet, Hangout, and pointer respectively. Therefore, proposed ELZW algorithm is superior to 1 byte LZW algorithm as 7.0125 percent and superior to 2 byte LZW algorithm as 11.725 percent. This paper represents a improved data Compression algorithm of mixed text file by 2 byte completion Hangout and 1 byte alphabet form. This document is an example of what your camera-ready manuscript to ITC-CSCC 2002 should look like. Authors are asked to conform to the directions reported in this document.

• 한국항해항만학회지
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• 제36권3호
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• pp.181-187
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• 2012

고소성 점토 및 소성, 비소성 실트의 정규압밀상태시의 처녀압축곡선이 항상 선형적 거동을 하는 것은 아니며, 비선형성을 가진 한국의 남해안 점토의 경우 압밀압력이 증가함에 따라 압축지수가 감소하며, $e-{\log}{\sigma}_{\upsilon}{\prime}$곡선은 아래로 오목한 형태의 거동을 하는 것으로 연구되었다. 본 연구에서는 한국 남부 해안의 점토를 대상으로 압밀시험을 수행하였고, 결과를 분석하여 초기간극비, 액성한계, 소성지수와 압축지수의 비선형성을 분석하였다. Butterfield의 기법을 이용한 ${\ln}{\upsilon}-{\ln}{\sigma}_{\upsilon}{\prime}$에서 액성한계 50~100%사이의 처녀압축곡선은 선형성을 보였으나, 초기간극비 2.24%, 액성한계 100%, 소성지수 60이상에서의 고소성 점토의 시험결과에서는 뚜렷한 비선형성이 나타났다. 비소성 실트(fly ash)를 90%이상 함유한 재성형 시료의 경우 압밀압력이 증가함에 따라 압축지수가 증가하는 경향을 보였다.

• 한국지반환경공학회 논문집
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• 제11권7호
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• pp.5-14
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• 2010

모래다짐말뚝(Sand Compaction Pile, 이하 SCP)으로 개량된 연약점토지반의 침하량 해석시, 근사법을 이용한 해석에서 응력분담비의 불확실성에 의해 발생되는 영향을 줄이고자, 유한요소해석 프로그램을 이용한 수치해석을 수행하였다. 모래다짐말뚝이 타설된 실내 모형압밀실험을 수행하였고, 이를 유한요소 프로그램으로 수치해석을 하였다. 실내실험과 같은 침하량을 도출하기 위해 역해석을 통한 혼합지반의 압축지수($C_c$)를 추정하고, 추세선을 활용하여 설계압축지수를 산정하는 식을 제시하였다. 또한, 이식을 치환율 45%인 현장에 적용하여 현장 적용성을 검증하였다.

• Journal of Korean Neurosurgical Society
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• 제65권5호
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• pp.730-740
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• 2022

Objective : Although several commercialized bone cements are used during percutaneous vertebroplasty (PVP) for patients with osteoporotic vertebral compression fracture (OVCF), there are no reports using domestic products from South Korea. In this study, we investigated the safety and efficacy of Spinofill^® (Injecta Inc., Gunpo, Korea), a new polymethyl methacrylate product. Methods : A prospective, single-center, and single-arm clinical trial of 30 participants who underwent PVP using Spinofill^® for painful thoracolumbar OVCF was performed with 6-months follow-up. Clinical and surgical outcomes included the Visual analog scale (VAS), Korean-Oswestry disability index (K-ODI), and Odom's criteria, complication rate, and recurrence rate. Radiological outcomes were evaluated by measuring the findings of postoperative computed tomography and simple radiograph. Results : The pain of VAS (from 8.95±1.05 to 4.65±2.06, p<0.001) and the life quality based on K-ODI (from 33.95±5.84 to 25.65±4.79, p<0.001) improved significantly, and successful patient satisfaction were achieved in 20 patients (66.7%) 1 day after surgery. These immediate improvements were maintained or more improved during the follow-up. There was no surgery- or product-related complications, but OVCF recurred in two patients (6.7%). Favorable cement interdigitation was reported in 24 patients (80.0%), and extra-vertebral cement leakage was reported in 13 patients (43.0%). The mean vertebral height ratio (from 60.49%±21.97% to 80.07%±13.16%, p<0.001) and segmental kyphotic angle (from 11.46°±8.50° to 7.79°±6.08°, p=0.002) improved one day after surgery. However, these short-term radiological findings somewhat regressed at the end. Conclusion : The overall outcomes of PVP using Spinofill^® were as favorable as those of other conventionally used products.

• Computers and Concrete
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• 제11권2호
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• pp.149-167
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• 2013

The complete stress-strain behavior of steel fiber reinforced concrete in compression is needed for the analysis and design of structures. An experimental investigation was carried out to generate the complete stress-strain curve of high-performance steel fiber reinforced concrete (HPSFRC) with a strength range of 52-80 MPa. The variation in concrete strength was achieved by varying the water-to-cementitious materials ratio of 0.40-0.25 and steel fiber content (Vf = 0.5, 1.0 and 1.5% with l/d = 80 and 55) in terms of fiber reinforcing parameter, at 10% silica fume replacement. The effects of these parameters on the shape of stress-strain curves are presented. Based on the test data, a simple model is proposed to generate the complete stress-strain relationship for HPSFRC. The proposed model has been found to give good correlation with the stress-strain curves generated experimentally. Inclusion of fibers into HPC improved the ductility considerably. Equations to quantify the effect of fibers on compressive strength, strain at peak stress and toughness of concrete in terms of fiber reinforcing index are also proposed, which predicted the test data quite accurately. Compressive strength prediction model was validated with the strength data of earlier researchers with an absolute variation of 2.1%.