• Steel and Composite Structures
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• 제45권6호
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• pp.819-830
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• 2022

This paper presented an experimental study of the bond-slip behavior of reactive powder concrete (RPC)-filled square steel tube. A total of 18 short composite specimens were designed forstatic push-out test, and information on their failure patterns, load-slip behavior and bond strength was presented. The effects of width-to-thickness ratio, height-to-width ratio and the compressive strength of RPC on the bond behavior were discussed. The experimental results show that:(1) the push-out specimens remain intact and no visible local buckling appears on the steel tube, and the interfacial scratches are even more pronounced at the internal steel tube of loading end; (2) the bond load-slip curves with different width-to-thickness ratios can be divided into two types, and the main difference is whether the curves have a drop in load with increasing slip; (3) the bond strength decreases with the increase of the width-to-thickness ratio and height-width ratio, while the influence of RPC strength is not consistent; (4) the slippage has no definite correlation with bond strength and the influence of designed parameters on slippage is not evident. On the basis of the above analysis, the expressions of interface friction stress and mechanical interaction stress are determined by neglecting chemical adhesive force, and the calculation model of bond strength for RPC filled in square steel tube specimens is proposed. The theoretical results agree well with the experimental data.

• 한국잠사곤충학회지
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• 제32권2호
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• pp.110-112
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• 1990

The influence of the concetration of the discharging agent on some properties of silk fabric dyed with reactive dyes studied. The tensile strength, yellow index and whiteness were investigated as parameters to determine the effect of the dischanging agent. The results were summarized as follows ; 1. The tensile strength and the yellow index decreased with the increase of the concentration of the discharging agents. 2. The whiteness depended on both of the type and the concentration of the discharging agent.

• 한국보육지원학회지
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• 제9권1호
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• pp.175-200
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• 2013

이 연구는 놀이가 영유아의 발달과 학습에서 차지하는 의미와 중요성에 비추어볼 때 교사의 문제행동지도를 놀이지도와의 관련성속에서 탐색해보는 것이 필요하다는 문제의식에 기초하여 교사의 놀이성, 놀이신념, 놀이교수효능감과 문제행동지도과의 관계를 살펴보고자 하였다. 이를 위해 서울시와 충청남도에 근무하는 어린이집 교사 151명을 대상으로 교사의 놀이성과 문제행동지도전략, 놀이신념과 문제행동지도전략의 관계를 살펴보고, 이들 관계에 놀이교수효능감이 매개역할을 하는지 알아보았다. 주요 연구결과는 다음과 같다. 첫째, 교사 놀이성은 예방적 문제행동지도전략과 긍정적 반응 문제행동지도전략에 정적 영향을 미쳤다. 놀이신념은 예방적 문제행동지도전략과 긍정적 반응 문제행동지도전략에 정적 영향을 미쳤고, 부정적 문제행동지도전략에는 부적 영향을 미쳤다. 둘째 교사의 놀이성과 놀이신념은 매개변인인 놀이교수효능감에 정적 영향을 미쳤다. 셋째, 교사의 놀이교수 효능감은 놀이성과 예방적 문제행동지도전략 간의 관계, 놀이성과 긍정적 반응 문제행동지도전략 간의 관계를 매개하였다.

• Elastomers and Composites
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• 제14권2호
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• pp.83-102
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• 1979

The purpose of this dissertation is to study some of the vulcanization characteristics of rubber-bound antioxidants such as G-1, [N-(3-methacryloyloxy-2-hydroxypropyl)-N'-phenyl-p-phenylene diamine] and acryl, acrylamide & acrylester substituted hindered phenols. The influence of these antioxidants upon vulcanization characteristics in NR and SBR compounds in the presence of vulcanizing accelerators such as MSA, TT, DM, M & D was evaluated by means of Oscillationg Disk Cure Meter. The comparison was also made between the influence of rubber-bound antioxidants and that of conventional non-reactive antioxidants such as N-alkyl substituted PADA series. Regarding the influence of reactive type antioxidant G-1 mixed with accelerator TT upon vulcanization characteristics, rapid onset of vulcanization and higher degree of cross-linking were discovered, whereas in the case of accelerator M and DM, the result was slow onset of vulcanization and lesser degree of cross-linking. The comparison of vulcanizing characteristics among acrylic substituted hindered phenols as antioxidants was made under several vulcanization accelerator systems. Under such systems, MSA-S combined accelerator caused the onset of vulcanization to slow down and lowered the degree of cross-linking. Finally in the case of hindered phenol derivatives containing longer substituent, the delayed onset of vulcanization and the lowered degree of cross-linking could be discerned.

• 대한의생명과학회지
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• 제11권3호
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• pp.253-258
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• 2005

Reactive oxygen species (ROS) and sex hormones affect the proliferation of cells and are believed to play important roles in tumorigenesis. However, little is known regarding how these two factors interact to affect cell proliferation. In this study, hepal-6 cells were treated with ROS and sex hormones (testosterone and steroidal) either separately or in combination. The sex hormones had no significant influence the cell proliferation up to a concentration of $1{\mu}M$. However, cell proliferation was inhibited when the cells were treated simultaneously with $H_2O_2$, which alone was found to promote cell proliferation at the concentrations of $15{\mu}M$. In conclusion, this study indicates that instead of promoting the cell proliferation, ROS interact with sex hormones to inhibit the Hepa 1-6 cell proliferation.

• Journal of Power Electronics
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• 제13권4호
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• pp.719-728
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• 2013

A novel hybrid active power filter (NHAPF) that can be adopted in high-voltage systems is proposed in this paper. The topological structure and filtering principle of the compensating system is provided and analyzed, respectively. Different controlling strategies are also presented to select the suitable strategy for the compensation system. Based on the selected strategy, the harmonic suppression function is used to analyze the influence of system parameters on the compensating system with MATLAB. Moreover, parameters in the injection branch are designed and analyzed. The performance of the proposed NHAPF in harmonic suppression and reactive power compensation is simulated with PSim. Thereafter, the overall control method is proposed. Simulation analysis and real experiments show that the proposed NHAPF exhibits good harmonic suppression and reactive power compensation. The proposed compensated system is based on the three-phase four-switch inverter, which is inexpensive, and the control method is verified for validity and effectiveness.

• 한국염색가공학회지
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• 제5권4호
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• pp.20-28
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• 1993

Primary amino group was introduced into cellulose by the Hofmann reaction from carbamoylethylated cotton fabrics. Cabamoylethylated cotton was prepared by treating the cotton fabrics with acrylamide and sodium hydroxide catalysts. These amino group altered physical and chemical properties of cotton fabrics. The influence of reactive dyeing, tensile strength and crease recovery was investigated. The exhaustion of reactive dye with cationized cotton fabrics was increase with acrylamide concentration. The pH value of maximum exhaustion was exchanged from 11.0 to 9.0 in cationized cotton fabrics.

• 수산해양교육연구
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• 제24권3호
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• pp.424-435
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• 2012

This study aimed to examine the influences of children's sex and the social information interpretation(intentional/incidental) on aggressions (form/function). The subjects were 363 fifth and sixth graders from 6 elementary schools in Busan and the data were analyzed with two-way ANOVA. The research findings were as follows: First, children's sex had significant influence upon their overt aggression, and children's interpretation of social information had significant influences upon their overt aggression and relational aggression alike. Second, children's sex and interpretation of social information had significant influences upon their proactive aggression and reactive aggression. Finally, children's sex had significant influences upon proactive-overt aggression, reactive-overt aggression and proactive-relational aggression.

• International journal of advanced smart convergence
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• 제11권2호
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• pp.88-94
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• 2022

The relationship between sound and vision was experimentally confirmed by physicist Ernst Florens Friedrich Chladni as early as the 18th century and formally entered into systematic research. With the development of emerging media technology, sound reactive type visual content is not limited to a single visual interaction based on the vibration of sound, and its visual content shows a diversified and scalable development trend according to different purposes in many fields. This study analyzes the development and changes of sound visual art contents from early stage to modernization, and analyzes the development characteristic of sound visual art content in different fields and scene environments influence by interactive media, new media technologies and devices by means of case analysis. Through this research, it is expected that the sound reactive type visual art content can continue to develop and extend in the existing fields, while explore the scalability of the application of sound reactive type visual art content in more fields.

• 전기학회논문지
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• 제66권3호
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• pp.593-598
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• 2017

Induction generator is always required reactive power in order to generate a rotating magnetic field as an inductive load. The reactive power must be continuously supplied to the induction generator as well as load of distribution system from the power supply side. So the power factor of the power supply side during the induction generation operation is low. Condenser is installed in order to raise the low power factor of the induction generator. Switching transients occurs when the power supply of the capacitor is turned on in order to ensure the low power factor. When using the reactor in series with the capacitor in order to reduce the influence of switching transient, it can affect the reactive power by the condenser voltage rises. In this study, we analyzed the operating characteristics for power and power factor of induction generator in accordance with the presence or absence of the application of the serial reactors for switching transients reduction of the condenser and the condenser for power factor correction.