• 한방재활의학과학회지
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• 제26권4호
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• pp.1-8
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• 2016

Objectives Danggwisu-san (Dangguixu-san) is a herbal prescription frequently used to treat pain or swelling caused by contusion. To determine the expiration period through scientific methodology, stability of Danggwisu-san (Dangguixu-san) water extract, a herbal medicine, was examined under various storage conditions and periods. Methods Danggwisu-san (Dangguixu-san) was stored either at room temperature ($23{\pm}2^{\circ}C$), under a refrigerating condition ($4^{\circ}C$) or under a freezing condition ($-18{\pm}2^{\circ}C$) for 0, 1, 2, 3 or 4 weeks and then freeze-dried. Total phenol and total flavonoid amounts were investigated; contents of amygdalin (Prunus persica), paeoniflorin (Paeonia lactiflora), and glycyrrhizin (Glycyrrhiza uralensis) - the marker compounds of Danggwisu-san (Dangguixu-san) - were also analyzed through high performance liquid chromatography (HPLC). Results No significant change in total phenol and total flavonoid amounts was observed under the indicated storage conditions. Moreover, the contents of marker compounds, i.e. amygdalin, paeoniflorin, and glycyrrhizin, did not alter significantly under the indicated conditions, as well. Conclusions Danggwisu-san (Dangguixu-san) was found to be stable up until 4 weeks under the indicated conditions. Further studies on efficacy and long-term stability are warranted to establish the expiration period of Danggwisu-san (Dangguixu-san).

• The Journal of Advanced Prosthodontics
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• 제1권2호
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• pp.107-112
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• 2009

STATEMENT OF PROBLEM. Macroscopic and especially microscopic properties of implant surfaces play a major role in the osseous healing of dental implants. Dental implants with modified surfaces have shown stronger osseointegration than implants which are only turned (machined). Advanced surface modification techniques such as anodic oxidation and Ca-P application have been developed to achieve faster and stronger bonding between the host bone and the implant. PURPOSE. The purpose of this study was to investigate the effect of surface treatment of titanium dental implant on implant stability after insertion using the rabbit tibia model. MATERIAL AND METHODS. Three test groups were prepared: sandblasted, large-grit and acid-etched (SLA) implants, anodic oxidized implants, and anodized implants with Ca-P immersion. The turned implants served as control. Twenty rabbits received 80 implants in the tibia. Resonance frequencies were measured at the time of implant insertion, 2 weeks and 4 weeks of healing. Removal torque values (RTV) were measured 2 and 4 weeks after insertion. RESULTS. The implant stability quotient (ISQ) values of implants for resonance frequency analysis (RFA) increased significantly (P <. 05) during 2 weeks of healing period although there were no significant differences among the test and control groups (P >. 05). The test and control implants also showed significantly higher ISQ values during 4 weeks of healing period (P < .05). No significant differences, however, were found among all the groups. All the groups showed no significant differences in ISQ values between 2 and 4 weeks after implant insertion (P >. 05). The SLA, anodized and Ca-P immersed implants showed higher RTVs at 2 and 4 weeks of healing than the machined one (P < .05). However, there was no significant difference among the experimental groups. CONCLUSION. The surface-modified implants appear to provide superior implant stability to the turned one. Under the limitation of this study, however, we suggest that neither anodic oxidation nor Ca-P immersion techniques have any advantage over the conventional SLA technique with respect to implant stability.

• 한국식품과학회지
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• 제32권2호
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• pp.246-251
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• 2000

볶음온도$(110^{\circ}C{\sim}230^{\circ}C)$에 따른 항산화성분의 변화를 조사한 결과, $170^{\circ}C$ 이상에서 백색도가 현저하게 감소하였다. 리그난변화에 있어서는 검출된 7종의 lignan들은 $170^{\circ}C$까지의 온도변화에서 일정하게 유지되다가 sesamolin은 $170^{\circ}C$ 이후 급격히 감소되었고, sesamin은 약간 감소경향을 나타내었다. sesamol, unknown1, unknown3은 $170^{\circ}C$ 이후 급격히 증가하였다. 토코페롤 함량변화에 있어서는 ${\gamma}$체만이 검출되었으며, 미가열참깨의 경우 70.59mg%, 온도상승에 따라 $170^{\circ}C$까지는 점차 증가하다가 $190^{\circ}C$이후 급격히 감소하여 $220^{\circ}C$에서는 33.87mg%이었고, $230^{\circ}C$에서는 26.73mg% 이었다. 산화안정성에 있어서는 미가열참깨의 경우 유도기간이 4.12hr로 가장 낮았고, 볶음온도상승에 따라 증가하다가 $170^{\circ}C$ 이후 현저히 증가하였다. 이상의 결과로부터 산화안정성과 백색도의 상관계수는 -0.993, $170^{\circ}C$ 이상에서 산화안정성과 sesamol의 상관계수는 0.934이었다. 따라서, 볶음온도에 따른 이러한 산화안정성의 현저한 증가는 sesamol, unknown1, unknown3 등 리그난의 증가에서 비롯됨을 알수 있었다.

• 정보교육학회논문지
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• 제26권4호
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• pp.239-248
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• 2022

한국교육방송공사에서 초·중학생을 대상으로 학습 멘토링의 교육적 효과를 확인하기 위해, 학습 멘토링의 교육적 효과성 검사에 모두 참여한 425명의 학생을 대상으로 자기주도적 학습능력, 정서적 안정감, 학습효과를 분석하였다. 그 결과, 멘토링 서비스 기간, 방법, 횟수에 따른 교육적 효과는 통계적으로 유의미한 차이가 나타나지 않았고, 멘토링 시간에 따른 자기주도학습 능력에 통계적으로 유의미하게 차이가 있었다. 멘토에 대한 인식이 교육적 효과에 미치는 영향을 분석한 결과, 멘토에 대해 긍정적일수록 그리고 멘토 역할을 긍정적으로 생각할수록 자기주도학습 능력과 정서적 안정감이 높게 나타났다. 학습효과에 대해서는, 멘토링 만족도가 국어, 영어, 수학학습 효과에 모두 가장 큰 영향을 미치고 있었고. 멘토 역할은 국어와 수학에 영향을 미치고 있었다. 이러한 연구결과를 바탕으로 온라인 학습시 소외계층 학생들의 학습 격차를 줄이기 위한 더욱 효과적인 방법을 구안하고, EBS 학습 멘토링 사업을 지속적으로 추진할 수 있도록 해야할 것이다.

• 터널과지하공간
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• 제33권5호
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• pp.399-413
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• 2023

본 연구에서는 TOUGH-FLAC 연동해석 기법을 사용하여 장기분지 유망 저장소 부지에서의 CO₂ 주입을 수치적으로 모델링하고, 주변 지층과 단층에 야기되는 수리-역학적 안정성을 검토하였다. 대상부지의 현장조사와 3D 지질모델을 기반으로 3년간 32,850톤의 CO₂ 주입을 가정하여 시뮬레이션을 수행하였다. 저류층의 투수계수에 따른 CO₂ 플럼의 유동 경로를 분석한 결과, 투수계수를 10^-14 m²로 가정한 경우 방사형 유동을 보이며 2년 9개월 경과 시 단층에 도달하는 것으로 나타났다. 투수계수를 10^-13 m²로 가정한 경우에는 저류층을 따라 서쪽 방향의 유동이 우세하게 나타났으며 단층 방향으로의 유동은 거의 발생하지 않았다. 주입공 주변의 압력 변화는 3년 동안 0.6 MPa 이하로, 지층 및 단층의 역학적 안정성에 미치는 영향은 미미한 것으로 분석되었다.

• 동아시아식생활학회지
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• 제10권4호
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• pp.274-280
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• 2000

The effect of heated oil on human nutrition has recently become of great interest to nutritionists and food chemists. However, the detrimental effect of heated oil has been hardly studied extensively and many problems have still remained unsolved. This study was carried out to investigate the storage stability of the heated oils at room temperature (25$\pm$5$^{\circ}C$), with the variation in storage conditions (addition of spices and herbs) for 7 weeks period. The rancidity of the oils according to storage time and condition was measured and compared with TBA, ferric thiocyanate, and DPPH method. For fresh oil, when stored for 7 weeks at room temperature, her was no significant change in the degree of oxidation. But for the heated oil with frying materials, the degree of oxidation significantly increased at 5 weeks(p<0.05). When stored with spices and herbs, the degree of oxidation significantly decreased with storage period(p<0.05). Antioxidative activity of herbs, especially sage group was higher than that of any other group.

• 농촌계획
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• 제22권4호
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• pp.147-157
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• 2016

On the purpose to analyze the survival rate of startup companies since their establishment, the companies' survival rate was investigated by surviving period. The average and coefficient of variation(C.V.) of the startup companies' survival rate were examined with the comparison of urban and rural areas, and primary, secondary, and tertiary industries. In this study, the variation of total numbers of new-established companies, from 1998 to 2012, were analyzed with micro-data of the Statistics Korea, 'The Census on Establishments'. The results show that the survival rate of primary industry companies largely fluctuate and don't be stabled during the whole surviving periods, whereas secondary and tertiary industry companies show stabilized survival rate after fifth year from their establishment. Especially, the startup companies of primary industry located at urban areas show the largest fluctuation and the most vulnerable stability of survival rate. It is concluded that the surviving period of primary industry companies don't guarantee their survival, while survival rate of secondary and tertiary industry company became stable after five years from their establishment.

• 한국실내디자인학회논문집
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• 제38호
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• pp.108-115
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• 2003

Between 1890-1914, the fundamental changes of the housing in United Sates of America were provoked to attempt the housing developments to adapt modern social system. The worthy of notice is that F L. Wright's Prairie House had been tested and built during the period as 'the first and second era' Despite the transition period in America, this represents that Wright's Prairie House series were developed. There are possibilities that some of the reformers assertion for Housing Development, on behalf of Arts & Crafts Movement, led to Wright's early house inner space design. For this reason, this study is to examine Ideologies that Wright has been accepted between the turning point of America's Arts & Crafts Movement and Hull House Circle. In terms of the ideologies acceptance, the study is also to examine how to be represented his inner space design characteristics. As the result, between'Simplification'housing development and the traditional housing In America, F L. Wright sublimated his own architectural aesthetic as accepting all functional elements to consider inevitability in this period, such as the association between economical and rational space, the plan to led on free plane, the spatial side and the stability of family life and the community, through the unification space having the consecutiveness.

• 대한통합의학회지
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• 제8권2호
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• pp.75-88
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• 2020

Purpose : Dysmenorrhea can be caused by misalignment of the pelvis. Since pilates stabilization exercise is a methods that affects pelvic alignment by inducing contraction of abdominal muscles, the purpose of this study is to determine whether dysmenorrhea is reduced when pilates stabilization exercise is applied. Methods : 47 dysmenorrhea patients were randomly divided into experimental (n=23) and control (n=24) groups. The experimental group performed pilates stabilization exercise three times a week for 12 weeks, and the control group did not perform any intervention. Abdominal muscle thickness, lumbar pelvic alignment, and dysmenorrhea were measured before intervention, 6 weeks, and 12 weeks after intervention to determine the mean change over time and the effect of group and factor interactions (repeated measured ANOVA and contrast test for each period). Results : In the experimental group, the thickness of the transverse abdominis, internal oblique, and external oblique muscles were increased significantly by group and period (p<.05). The pelvic torsion, lordosis and dysmenorrhea were also significantly decreased by group and period. But the control group did not change significantly in any of the variables. Conclusion : Applying pilates stabilization exercise to women with dysmenorrhea may be an effective intervention that contributes to relieving dysmenorrhea by correcting the stability and alignment of the lumbar pelvis.

• Structural Engineering and Mechanics
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• 제39권4호
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• pp.465-498
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• 2011

Concrete structures are generally cracked in flexural tension at working loads. Concrete beams with asymmetric section details and crack patterns exhibit different flexural rigidity depending upon the sense of the applied flexural moment. In this paper, three different models, having the same natural period, of such SDOF bilinear dynamical systems have been proposed. The Model-I and Model-II have constant damping coefficient, but the latter is characterized by two stiffness coefficients depending upon the sense of vibration amplitude. The Model-III, additionally, has two damping coefficients as well. In this paper, the dynamical response of Model-III to sinusoidal loading has been investigated and compared with that of Model-II studied earlier. It has been found that Model-III exhibits regular and irregular sub-harmonics, jump phenomena and strong sensitivity to initial conditions, forcing frequency, system period as well as the sense of peak sinusoidal force. The constant sustained load has been found to affect the natural period of the dynamical system. The predictions of Model-I have been compared with those of the approximate linear model adopted in present practice. The behaviour exhibited by different models of the SDOF cracked elastic concrete structures under working loads and the theoretical and practical implications of the approach followed have been critically evaluated.