• The Journal of Asian Finance, Economics and Business
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• 제5권4호
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• pp.45-56
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• 2018

The paper aims to examine relationships between search-based sentiment and stock market reactions in Vietnam. This study constructs an internet search-based measure of sentiment and examines its relationship with Vietnamese stock market returns. The sentiment index is derived from Google Trends' Search Volume Index of financial and economic terms that Vietnamese searched from January 2011 to June 2018. Consistent with prediction from sentiment theories, the study documents significant short-term reversals across three major stock indices. The difference from previous literature is that Vietnam stock market absorbs the contemporaneous decline slower while the subsequent rebound happens within a day. The results of the study suggest that the sentiment-induced effect is mainly driven by pessimism. On the other hand, optimistic investors seem to delay in taking their investment action until the market corrects. The study proposes a unified explanation for our findings based on the overreaction hypothesis of the bearish group and the strategic delay of the optimistic group. The findings of the study contribute to the behavioral finance strand that studies the role of sentiment in emerging financial markets, where noise traders and limits to arbitrage are more obvious. They also encourage the continuous application of search data to explore other investor behaviors in securities markets.

• Elastomers and Composites
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• 제20권1호
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• pp.13-24
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• 1985

It is generally agreed that strong linkages exist between rubber chains and reinforcing filler particles. The purpose of this study is to examine the effect of rubber-filler attachments on the various mechanical properties of the rubber. In particular, the modulus and strength will be altered by these attachments. For this study, the curing properties are examined by means of ODR (Oscillating Disk Rheometer), the physical properties by means of Instrong. The results of this study can be summarized as follows. In the ODR test, the carbon black filled stock has shorter scorch time than gum stock and, the silica and clay filled stock has longer scorch time than gum stock. In the modulus, ten sile and swelling properties, the vulcanizates filled with carbon black had higher those values than inorganic filler loaded NR vulcanizates, but the rebound rate showed that the silica filled NR vulcanizates was lower than other inorganic filler contained NR vulcanizates and the ISAF filled NR vulcanizates was lower than other carbon block contained NR vulcanizates.

• 열처리공학회지
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• 제3권2호
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• pp.32-36
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• 1990

For the accurate measurements of hardness in a material, it is necessary to have a thorough understanding of the effects of test variables on the accuracy of hardness value. For the rebound hardness test, major test variables are the radius of hammer ball tip, type of backing materials, size and roughness of the specimen. In this study, effects of these variables on Equo-Tip hardness value were investigated. Hardness measurements were carried out using WC balls with various sizes of worn-ot zone. The sample materials chosen for the experiments were commercial standard hardness blocks and SM45C steel bars subjected to either normalization or quench and temper treatments. As backing materials, aluminum, steel and rubber plates were used in all the experiments. Experimental results show that for the accurate measurements of Equo-tip hardness, it is necessary to use the hammer ball with a worn-out zone parameter of less than 0.23, and the recommended minimum thickness and width of the specimen are 25mm and 70mm, respectively. Further for the surface preparation, the specimens need to be polished with an emery paper of No. 400 or finer, and for the backing matrials, it is recommended to use steels or rubbers.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1997년도 추계학술대회논문집
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• pp.398-405
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• 1997

과거 8년간의(1985-1992) 통계에 의하면 정면과 측면 충돌시 구속 시스텡의 하나인 Airbag장착 차량의 사망자 및 중상자 수가 현저히 감소하고 있는 것으로 나타나고있다. 그 러나 최근 소비자로 부터의 Airbag에 관한 불만을 보고 받고 있다. 즉 구속효과를 발휘함에 있어 부수적으로 인체 부상을 유발하고 있다는 것이다. 사망내지는 심각한 부상은 방지하고 있으나 경미한 부상은 오히려 증가하고 또한 신체가 적은 여성 운전자나 6세 이하의 어린이 에게는 심각한 부상의 우려가 있다는 것이다. 본 연구에서는 구속시스템의 총아인 Airbag 시스템의 심각한 부수적인 부상 보고를 입증하기 위하여 우리나라 어린이 6세 신체를 기준 으로하여 구속시스템을 착용하지 않았을 경우(실제로 많은 경우), seat belt만 착용시, Airbag만 작용시, 그리고 seat belt와 Airbag을 동시에 사용할 때를 컴퓨터 Simulation Package 이용 신체 dynamic을 모의실험 하였다. 실험결과, 기존에 알려진바와 같이 구속시스템을 사용하지 않았을 경우에 부상은 매우 컸다. 신체 사이즈가 작은 어린이 혹은 여성 운전자의 경우 Seat belt만을 사용한 경우는 Airbag만을 사용한 경우보다는 부상정도가 약간 경미하였으나 두 경우 모두 인체가 구속시스템의 구속 범위를 이탈하여 구속 시스템으로써의 역할을 충분히 하지 못하고 있었다. 특히 Seat belt와 Airbag을 동시에 사용하였을시에도 Airbag이 충분히 개선된 이후라도 신체 사이즈가 작은 경우에는 흉부부위에 의한 충격 흡수가 먼저 이루어지지 못하고, 머리에 먼저 Airbag이 접촉이 되어 충격 흡수 역할보다는 반동효과가 더 커서 머리 및 몸체가 뒤로 Rebound 하는 효과로 머리, 혹은 목의 신체 부상한계를 넘고 있어 큰 부상 내지는 사망에 이르고 있음을 알 수 있었다. 사료된다.의 결과는 자전거 에르고노미터의 결과가 트레드밀의 결과에 87.60%정도 나타났다.음을 관찰하였다. 특히 vitamin C와 E의 병용투여는 상승적으로 적용하여 간세포손상을 더욱 억제시킴을 알 수 있었다.mance and on TFP(Total Factor Productivity) growth which is a pure measure of firm performance. To utilize the advantage of panel data, FEM(Fixed Effect Model) and REM(Random Effect Model) were used. The empirical result shows that the entropy index as a measurement of inter-business relatedness is not significant but technological relatedness index is significant. OLS estimates on pooled data were considerably different from FEM or REM estimates on panel data. By introducing interaction effect among the three variables for business portfolio properties, we obtained three findings. First, only VI (Vertical integration) has a significant positive correlation with ROS. Second, when using TFP growth as an dependent variable, both TR(Technological Relatedness) and f[ are significant and positively rel

• 한방안이비인후피부과학회지
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• 제33권3호
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• pp.115-124
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• 2020

Objectives : The purpose of this study is to investigate the effect and side effects of steroids on dermatitis and skin barrier through lipid metabolism. And to propose using Herbal medicine to suppress Steroid rebound and prevent side effects. Methods : We reviewed recent studies about the relationship between dermatitis, skin lipid, steroid, and herbal medicine through Google scholar. Results : In various inflammatory skin diseases, the corticosteroid is selected as the primary drug due to its strong anti-inflammatory and immunosuppressive effect. However, long-term use of steroids has a variety of side effects, especially lipid metabolism disruption, which aggravates skin barrier damage underlying various skin diseases and is more susceptible to inflammatory reactions. Conclusions : Herbal medicine is used as a comprehensive approach, and it can be used to reduce the frequency of steroid exposure by protecting against barrier damage by controlling anti-inflammatory, antioxidant, and systemic/sebaceous lipid metabolism and stratum corneum protein differentiation.

• 국제지역연구
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• 제22권1호
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• pp.41-60
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• 2018

일반적으로 생산성이 향상되면 생산을 위해 필요한 에너지소비량은 감축되는 것으로 알려져 있다. 정부의 에너지사용량 절감 정책도 기업의 생산성 향상에 초점이 맞추어져 있다. 그러나 생산성 향상이 생산량 증가를 통해 결국 에너지소비량을 증가시키는 생산성 딜레마 현상의 발생 가능성이 최근 제기되고 있다. 본 연구는 생산성 딜레마 현상이 한국의 기업에 존재하는지 여부를 Tang et al(2015)의 이론적 모형을 한국 기업에 적용하여 분석하였다. 이를 위해 2011년부터 2015년까지 한국의 715개 기업을 대상으로 실증분석을 수행하였으며 에너지변수의 특성상 동적모델을 설정하였고 시차변수를 사용함으로써 발생할 수 있는 내생성을 최소화하고자 시스템 GMM방법으로 추정하였다. 분석결과 생산성 총효과가 유의한 음의 계수로 도출되어 생산량 증가효과로 인한 에너지소비량 증가보다 생산성 자체효과를 통한 에너지소비량 감소가 더 큰 것으로 나타났다. 즉, 생산성 딜레마가 발견되지 않았으며 해외기업과 국내기업을 구분하여 분석한 결과도 마찬가지로 생산성 딜레마가 발견되지 않았다.

• Korean Journal of Acupuncture
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• 제34권2호
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• pp.82-87
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• 2017

Objectives : Recently the case of lactobacillus mixture culture fluid appliment was reported. In this study, anti-inflamation effects and anti-allergy effects were studied by stimulus of lactobacillus mixture culture fluid extracts in HaCaT cells. Methods : The atopic dermatitis were induced by TNF-${\alpha}$ and interferon-${\gamma}$ in HaCaT cells. TARC/CCL17, MDC/CCL22, RANTES/CCL5 and ROS production were investigated to explain anti-inflamation and allergy effects of lactobacillus mixture culture fluid with cell-enzyme-linked Immunosorbent assay in 450 nm, 485 nm, 535 nm with spectro-fluorometer. Results : The extracts of lactobacillus mixture culture fluid were decreased TARC/CCL17, MDC/CCL22, RANTES/CCL5 expressions and ROS production with a concentration dependent manner. Conclusions : The effects mechanism of Lactobacillus mixed culture fluid for atopic dermatitis symptoms were considered to be explain anti-inflamation and allergy effects via control of cytokine, chemokine and ROS production, and the fluid could be applied in skin cells directly. But classified AD symptom degrees reported in clinical case before as Reaction Period, Reduction Period, Effect Period, Reproduction Period and Rebound Period could not be explained. Further study will be expected.

• Toxicological Research
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• 제14권4호
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• pp.483-488
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• 1998

During cerebral ischemia two important factors such as hypoxia and reduction of glucose can act as modulating stressor affecting the release of amine neurotransmitters including 5-hydroxytryptamine (5-HT). This study was performed to investigate the effect of glucose deprivation on the oxygen deprivation-induced changes of [3H]-5-HT release in the rat hippocampal slices. Experimental groups were divided into 4 groups for this study: normoxic/normoglycemic group, oxygen-deprived group, glucose-deprived group, and oxygen/glucose-deprived group. The hippocampus of rat brain was sliced by 400 $\mu\textrm{m}$ thickness with manual chopper. After 30 minutes preincubation in the normal buffer, the slices were incubated for 20 min in buffer containing [3H]-5-HT (0.1 M, 74 $\mu\textrm$Ci) for uptake. To measure the release of [3H]-5-HT into the buffer, the incubation medium was drained of and refilled with fresh buffer every ten minutes through a sequence of 14 tubes. Oxygen deprivation by gassing with 95% $N_2$/5% $CO_2$ and/or glucose deprivation was done in the 6th and 7th tube. The radioactivities in each buffer and the tissue were counted using scintillation counter. The results were expressed as fractional release. When slices were exposed to oxygen-deprived media for 20 min, the diminution followed by the rebound release of [3H]-5-HT was observed during the post-oxygen deprived period. However, glucose deprivation or oxygen/glucose deprivation markedly increased the release of [3H]-5-HT. which was opposite to the pattern observed in oxygen-deprived group. These results suggested that oxygen deprivation itself inhibits [3H]-5-HT release in rat hippocampal slices during oxygen-deprived period, but additional glucose deprivation convert the inhibitory response to increase of [3H]-5-HT release.

• Elastomers and Composites
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• 제49권2호
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• pp.127-133
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• 2014

BR/PCIIR 복합체에 대한 분산상의 영향을 분석하기 위하여 예비가교된 CIIR을 BR과 함께 니더가공하여 고무복합체를 제조하였다. 분산상으로 사용된 CIIR 예비가교물을 니더에서 한번 더 가공함으로써 BR/PCIIR 복합체에서 분산상의 입자가 적어지고 균일하게 분산되었다. BR/PCIIR40의 경우 예비가교물의 니더 가공 시간이 복합체의 반발탄성 및 경도에 아무런 영향을 미치지 않았다. 예비가교된 CIIR 입자를 니더기로 가공한 후 BR에 혼합하여 복합체를 제조한 경우, 니더가공하지 않은 복합체의 인장강도에 비하여 10% 이상 현저히 향상되었다. 분산상으로 사용되는 CIIR 예비가교물을 니더로 가공함으로서 복합체의 표면마찰 특성은 그대로 유지하면서도 복합체의 내마모성 및 기계적 성질은 현저히 향상되었다.

• 한국건축시공학회지
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• 제17권2호
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• pp.127-134
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• 2017

최근 국내 아파트의 외벽 거푸집공사의 경우 대부분 갱폼 시스템을 통해 철근콘크리트 구조체를 시공하고 있다. 이러한 갱폼 거푸집을 사용한 콘크리트의 경우는 거푸집 탈형 후 외부환경에 노출되고 특히, 건조한 봄, 가을과 일사량이 높은 서중시기의 벽량이 많은 아파트 측벽에 다량의 균열이 발생되어지고 있다. 이에, 본 연구에서는 신축 아파트 건설현장 중심으로 균열량이 많은 아파트 측벽부분의 갱폼시스템에 습윤양생 자동설비장치를 적용하여 초기 콘크리트 양생에 필요한 수분을 공급함으로써 콘크리트의 품질확보와 다량의 측벽균열 저감을 통한 습윤양생 자동장치의 효율성 및 활용성을 검토하고자 하였는데, 그 결과, 양생 효과 및 낙수량 고려 시 습윤양생 자동장치에 0.3mm 사이즈의 노즐을 사용하여 살수양생을 실시할 경우, 자원낭비 없이 콘크리트의 품질향상 및 균열저감에 효과적인 것으로 판단되었다.