• 디지털융복합연구
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• 제11권10호
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• pp.549-556
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• 2013

본 연구는 만성 뇌졸중으로 인한 편마비 환자를 대상으로 런지자세에서 자가신장과 움직임을 동반한 가동술을 적용후에 하지근육 근활성도와 안정성한계에 미치는 영향을 알아보는데 있다. 대상자 16명을 무작위 추출하여 실험군과 대조군으로 분류하였다. 실험군은 런지자세에서 자가신장을 중재하였고, 대조군은 런지자세에서 움직임을 동반한 가동술을 중재하였다. 중재는 8주 동안 주 5회, 1회 20분의 중재를 시행하였다. 통계학적 처리는 반복 측정분산분석을 이용하여 실시하였다. 결과는 실험군과 대조군의 그룹간 하지근육 근활성도(%MVIC)와 안정성 한계(LOS)는 통계학적 유의성이 없었다(p>.05). 하지만 실험군과 대조군의 그룹 내의 근활성도와 안정성 한계는 통계학적으로 유의하였다(p<.05). 따라서 뇌졸중으로 인한 편마비 환자들에게 런지자세에서 자가신장이 근력 및 균형에 긍정적인 영향을 줄 수 있을 것으로 생각된다.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2021년도 학술논문집
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• pp.239-245
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• 2021

한국교육방송공사에서 초등학생을 대상으로 4주간 실시한 학습 멘토링의 교육적 효과를 분석하기 위해, 학습 멘토링에 참여한 27명의 학생을 대상으로 자기주도적 학습능력과 정서적 안정감의 변화를 사전사후 검사를 통해 분석하였다. 그 결과, 학생들의 자기주도적 학습능력과 정서적 안정감이 모두 향상된 것으로 파악되었다. 또한, 학생들은 학습을 지도해준 멘토에 대한 만족도가 높게 나타났다. 따라서 원격 수업 상황에서 소외계층 학생들의 학습 격차를 줄이려면, EBS 학습 멘토링 사업을 지속적으로 추진하고, 멘토링 기간과 멘토링에 참여하는 학생과 교사의 수도 크게 증가시켜야 한다.

• 약학회지
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• 제38권6호
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• pp.637-645
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• 1994

The effect of various drugs on the stability of the liposomal membrane of phosphatidylcholine and cholesterol was studied, employing the fluorescence self-quenching method. Calcein was entrapped into the phospholipid small unilamellar vesicles and the leakage of the fluorescence probe was monitored on adding the drug to the system. The results of the experiments showed that phenothiazine derivatives, some potent local anesthetics and surface active agents were very effective in inducing the leakage of calcein from the liposome. The leakage-inducing activity of these drug substances has been ascribed to their surface activity and the perturbation of the liposomal membrane by these substances. On the other hand drug substance with low surface activity or without amphiphilic moieties did not show any effect or only small effect on the leakage of calcein from the liposomes. The effect of lipid concentration on the stability of the liposomes was also investigated to show that the higher concentrations of lipid more drug was required to induce the leakage. The effect of surface charges of vesicles was also studied, and the results showed that the charge on the liposomes enhanced the stability of the liposomes against the leakage-inducing activity of these drug substances.

• 대한수학회지
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• 제39권4호
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• pp.559-577
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• 2002

It is known that the analytic operator-valued Feynman integral exists for some "potentials" which we so singular that they must be given by measures rather than by functions. Corresponding stability results involving monotonicity assumptions have been established by the author and others. Here in our main theorem we prove further stability theorem without monotonicity requirements.

• 대한기계학회논문집A
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• 제33권3호
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• pp.210-217
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• 2009

This paper presents the analytical prediction of stability lobes in milling. The stability lobes are obtained by measuring the frequency response function (FRF) of a machining center at the cutting point of the end mill cutter, identifying cutting constants, and approximating cutting force coefficients. The stability lobes are experimentally verified through cutting tests.

• Journal of Korean Dental Science
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• 제8권2호
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• pp.49-56
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• 2015

Purpose: The effect of accelerated aging on color stability of various dual-cured self-adhesive resin cements were evaluated in this study. Materials and Methods: Color stability was examined using three different brands of dual-cured self-adhesive resin cements: G-CEM LinkAce (GC America), MaxCem Elite (Kerr), and PermaCem 2.0 (DMG) with the equivalent color shade. Each resin cement was filled with Teflon mold which has 6 mm diameter and 2 mm thickness. Each specimen was light cured for 20 seconds using light emitting diode (LED) light curing unit. In order to evaluate the effect of accelerated aging on color stability, color parameters (Commission Internationale de l'Eclairage, CIE $L^*$, $a^*$, $b^*$) and color differences (${\Delta}E^*$) were measured at three times: immediately, after 24 hours, and after thermocycling. The $L^*$, $a^*$, $b^*$ values were analyzed using Friedman test and ${\Delta}E^*$ values on the effect of 24 hours and accelerated aging were analyzed using t-test. These values were compared with the limit value of color difference (${\Delta}E^*=3.7$) for dental restoration. One-way ANOVA and Scheff's test (P<0.05) were performed to analyze each ${\Delta}E^*$ values between cements at each test period. Result: There was statistically significant difference in comparison of color specification ($L^*$, $a^*$, $b^*$) values after accelerated aging except $L^*$ value of G-CEM LinkAce (P<0.05). After 24 hours, color difference (${\Delta}E^*$) values were ranged from 2.47 to 3.48 and $L^*$ values decreased and $b^*$ values increased in all types of cement and MaxCem Elite had high color stability (P<0.05). After thermocycling, color change's tendency of cement was varied and color difference (${\Delta}E^*$) values were ranged from 0.82 to 2.87 and G-CEM LinkAce had high color stability (P<0.05). Conclusion: Color stability of dual-cured self-adhesive resin cements after accelerated aging was evaluated and statistically significant color changes occurred within clinically acceptable range.

• The Journal of Advanced Prosthodontics
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• 제3권1호
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• pp.10-15
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• 2011

PURPOSE. This study investigated the influence of bone quality and surgical technique on the implant stability quotient (ISQ) value. In addition, the influence of interfacial bone quality, directly surrounding the implant fixture, on the resonance frequency of the structure was also evaluated by the finite element analysis. MATERIALS AND METHODS. Two different types of bone (type 1 and type 2) were extracted and trimmed from pig rib bone. In each type of bone, the same implants were installed in three different ways: (1) Compaction, (2) Self-tapping, and (3) Tapping. The ISQ value was measured and analyzed to evaluate the influence of bone quality and surgical technique on the implant primary stability. For finite element analysis, a three dimensional implant fixture-bone structure was designed and the fundamental resonance frequency of the structure was measured with three different density of interfacial bone surrounding the implant fixture. RESULTS. In each group, the ISQ values were higher in type 1 bone than those in type 2 bone. Among three different insertion methods, the Tapping group showed the lowest ISQ value in both type 1 and type 2 bones. In both bone types, the Compaction groups showed slightly higher mean ISQ values than the Self-tapping groups, but the differences were not statistically significant. Increased interfacial bone density raised the resonance frequency value in the finite element analysis. CONCLUSION. Both bone quality and surgical technique have influence on the implant primary stability, and resonance frequency has a positive relation with the density of implant fixture-surrounding bone.

• 한국추진공학회지
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• 제14권5호
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• pp.92-100
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• 2010

75톤급 기술검증용 연소기의 연소안정성 시험이 저압 조건에서 수행되었다. 이 시험에 사용된 두 개의 연소기 헤드 중 하나는 631개의 분사기를 가지며, 다른 하나는 721개의 분사기를 가진다. 631개의 분사기를 갖는 연소기 헤드는 연소압력 30 bar에서 자발 불안정이 발생하였고 721개의 분사기를 갖는 연소기 헤드는 동일한 연소압력과 동일한 유량 조건에서 고주파 연소안정성이 유지됨을 보였다. 그러나 721개의 분사기를 갖는 연소기 헤드는 연소압력 20 bar에서 자발 불안정이 발생하였고 이러한 결과로부터 연소기 헤드의 형상은 안정성 경계 영역을 변화시킴을 알 수 있었다.

• 대한가정학회지
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• 제23권4호
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• pp.1-7
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• 1985

The aim of this study is to find out the relation-ship between personality and te factors for clothing selection. For the test, 396 high school girl students in Seoul were selected, respectively. The general personality test sheets by Kim Giseok and the questionnaire besed on Park Eunju's study on the factors for clothing selection were given to the sample group. RESULTS : 1. Behavior of clothing selection according to expression of individuality is sign ificantly correlated with ascendancy and sociability at the level of .001, and with emotional stability at .50. 2. Behavior of clothing selection according to utility is significantly correlated with resopnsibility and emotional stability at the level of .01. 3. Behavior of clothing selection according to economy is significantly correlated with ascendancy and self-confidence at the level of .01, and with responsibility and sociablity at .05. 4. Behavior of clothing selection according to modesty is significantly correlated with ascendancy and sociability at level of .001, and with self-confidence at .01. 5. Behavior of clothing selection according to conformity is significantly correlated with ascendancy, emothional stability, and self-confidence at the level of .001, and with sociability at .05.

• 한국안전학회지
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• 제31권3호
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• pp.102-108
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• 2016

As a range of accidents happen frequently in our society due to safety insensitivity, researches on individual psychological characteristics related to safety behavior and on safety education are increasing. However, safety behavior research that targets university students as potential employees remains rare. Therefore, this research investigates individual characteristics and psychological factors that affect safety behaviors of university students. Research participants were 131 university students (80 males, 51 females) from the Gyeonggi-do and Chungnam areas. Psychological characteristics (self-regulation, cognitive failure, conscientiousness, and emotional stability) were included as variables that may predict university students' safety behaviors (habits, compliance, mistakes, and violations). The major findings of the study are as follows. Stepwise regression analysis showed conscientiousness was a major predictor explaining safety habits and safety compliance; Cognitive failure and emotional stability were main predictors explaining safety mistakes, and self-regulation was a major predictor explaining safety violations. These findings suggest that development of proper education programs focusing on individual characteristics would allow systematic improvement of safety behaviors of university students.