• Corrosion Science and Technology
• /
• 제6권4호
• /
• pp.147-153
• /
• 2007

This study sought to investigate the reaction of Co-binder containing tungsten with molten zinc. Four kinds of Co-W alloys (pure, 10%W, 20%W, 30%W) were prepared using the powder metallurgy method. The specimens were immersion-tested in molten pure zinc baths at $460^{\circ}C$. To evaluate the corrosion property in molten zinc, the weight loss of the specimen was measured after the immersion tests at different immersion times (10~300 min.). Co-10%W alloys, compared with pure cobalt, showed no effect of tungsten addition on the reaction rate in molten zinc. The relationship between the weight loss and the square root of immersion period represents a straight line in both pure cobalt and Co-10%W alloy. The Co-Zn reaction layer in Co- 1O%W alloy consists of $\gamma2$, $\gamma1$, $\gamma$ and ($\beta1$ phases. The rate of weight loss significantly increases and the weight loss behavior is not well accord with the linear relationship as the tungsten content in the Co-W alloy increases. The $\beta1$ layer was not formed on the Co-20%W alloy and neither was a stable Co-Zn intermetallic compound layer found on the Co-30%W alloy. The main cause of increase in reaction rate with increasing tungsten content is related with the instability of the Co-Zn reaction phases as seen on micro-structural analysis.

• 한국엔터테인먼트산업학회논문지
• /
• 제14권5호
• /
• pp.103-114
• /
• 2020

본 연구의 목적은 성인골프참여가 운동몰입을 통한 운동지속에 미치는 영향의 차이 분석하여 지속적으로 골프 운동하도록 제시하는데 주된 목적이 있다. 이러한 연구 목적을 달성하기 위하여 2020년 1월에 경남에 소재한 성인 골프동호인 40~70세 대상을 선정하고 유층집락 무선 표집법(Systematic cluster random sampling)으로 표본 추출을 이용한 설문지로 시행하였다. 첫째, 타당도와 신뢰도를 확보하기 위해 요인분석과 신뢰도 분석을 실시하였다. 둘째, 응답자의 일반적 특성을 알아보기 위해 빈도분석 평균(M)과 표준편차(sd)를 실시하였다. 셋째, 일반적 특성에 따라 운동몰입과 운동지속의 차이를 규명하기 위해 t-test와 One-way ANOVA 분석을 실시하였다. 넷째, 변수들 간의 상관분석 및 다중회귀분석(Multiple Regression Analysis)을 실시하였다. 이와 같은 방법과 절차를 통하여 본 연구에서 얻어진 결과는 다음과 같다. 첫째, 일반적 특성의 운동몰입과 운동지속에 유의한 차이가 없는 것으로 나타났다. 둘째, 운동몰입은 운동지속에 높은 차이가 나타났다. 셋째, 운동몰입은 운동지속에 높은 영향이 미치는 것으로 나타났다.

• 한국심리학회지 : 문화 및 사회문제
• /
• 제18권2호
• /
• pp.153-167
• /
• 2012

본 연구는 서두름 행동의 5요인의 특성에 초점을 맞추어, 서두름 행동과 A형 행동의 관계를 바탕으로 서두름 행동의 5요인의 특성을 밝히고자 진행되었다. 이를 위해, 만 18세 이상 59세 이하 성인 207명이 서두름 행동 질문지와 A형 행동 질문지에 응답하였다. A형 행동 질문지는 A형 행동 및 성격을 측정하는 기존 문항을 바탕으로 총 136개 문항을 수집하였다. 그리고 요인분석을 통해 6개 요인으로 이루어진 29개 문항으로 축소되었다. A형 행동의 구성요인으로 성공추구, 인내부족, 실패불안, 과제몰입, 활동성, 민첩성이 나타났다. 서두름 행동요인분석 결과, 서두름 행동은 기존 연구와 동일한 5가지 요인으로 이루어져 있었다. 서두름 행동과 A형 행동의 상관분석 결과, 시간압력에서 나타나는 서두름 행동은 성공추구, 실패불안, 과제몰입, 민첩성과 정적상관을 보였다. 불편함에서 나타나는 서두름 행동과 고립에서 나타나는 서두름 행동은 인내심부족과 정적상관을 보였다. 지루함에서 나타나는 서두름 행동은 성공추구와 활동성 및 민첩성과 정적 상관이 있었다. 보상기대에서 나타나는 서두름 행동은 성공추구, 인내부족, 실패불안, 민첩성과 정적상관을 가지는 것으로 나타났다.

• 전기화학회지
• /
• 제17권1호
• /
• pp.26-29
• /
• 2014

The corrosion behavior of stainless steel 304 (SS 304), titanium, nickel and aluminium is studied by immersion and anodic polarization tests in non-aqueous electrolytes. Tetraethyl ammonium tetrafluoroborate is used as a supporting electrolyte in the three kinds of solvents. The immersion test shows that chemical corrosion rate in propylene carbonate-based electrolyte is lower than those in acetonitrile- or ${\gamma}$-butyrolactone-based electrolytes. Surface analyses do not reveal any corrosion product formed after the immersion test. In the anodic polarization tests, a higher concentration of supporting electrolyte gives a higher current density. In addition, a higher temperature increases the current density in the active region and reduces the potential range in the passive region. SS 304 shows the highest corrosion potential while Al shows the lowest corrosion potential and the highest current density in all studied conditions. Based on the conducted corrosion tests, the corrosion resistance of metal substrates in the organic solvents can be sorted in descending order as follows: SS 304 - Ti - Ni - Al.

• 한국도로학회논문집
• /
• 제18권4호
• /
• pp.47-53
• /
• 2016

PURPOSES : The objective of this study was to evaluate the results of the dynamic immersion test (DIT) through digital image analysis (DIA). METHODS : The asphalt binder retained post DIT was inspected visually by more than three investigators. However, because visual observations can be subjective, depending on the inspector's skills and knowledge, DIA was also performed. The threshold value for the DIA was determined by a mesh analysis, in which the digital image to be analyzed is divided into very small meshes. In addition, the bitumen bond strength (BBS) test was also performed to the compare the visual results with the mechanical values. RESULTS AND CONCLUSIONS : Depending on the materials used, various methods can be used to predict the behavior of retained asphalt. However, the increasing ratio in the trend of retained asphalt shows different behaviors among the evaluation methods. In this study, the results of the visual observations were significantly different from those of the DIA, the mesh analysis, and the BBS tests. Thus, DIA is an appropriate method for evaluating the results of the DIT. However, in order to use this technique in the field, it is necessary to determine a more reasonable threshold value by performing DIA on various materials.

• 한국재료학회지
• /
• 제17권4호
• /
• pp.192-197
• /
• 2007

The effects of immersion time in the liquid nitrogen on the behavior of aluminum alloys used for the hydrogen storage tank of auto-mobile at cryogenic temperature were investigated. With increasing immersion time in the liquid nitrogen, the elongation of AI 5083 alloy at cryogenic temperature decreased because of non-uniform fracture of precipitates on the grain boundary, and the serration also occurred because of discontinuous slip due to rapid decreasing of the specific heat. The mechanical properties of AI 6061 alloy at cryogenic temperature were characterized by uniformed yield strength, tensile strength and elongation regardless of the immersion time in the liquid nitrogen. These mechanical properties of aluminum alloys at cryogenic temperature were interpreted by the strength of grain boundary and the slip deformation behavior.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2005년도 추계학술대회 논문집
• /
• pp.256-259
• /
• 2005

Analysis of behavior pattern and thermal response during bathing and showering provides important fundamental data when developing an automatic bathing/showering system. The behavior pattern and physiological changes during bathing/showering were measured und analyzed for the aged male group. We recorded the volunteers showering at front, back, left and right view using four CCTV cameras in order to study the behavior pattern during showering. The photographic data were analyzed by counting the frequencies of body contact and identifying zones where hands could reach. In order to study the thermal response, we measured the blood pressure (B.P), heart rate (H.R), body temperature (B.T.), breathing rate (B.R) for the different water temperatures and the locations of immersion for the young and old age groups. The results showed that the frequencies of body contacts were varied for different body sections. Also there were some body sections where hands could not be reached because of reduced pliability and muscular strength of the aged group. But we observed rather uniform body contact frequencies when a towel was used. In partial immersion bath experiments, we observed the changes of B.P. H.R and B.T in the case of young and old age groups, and the changes were more significant in the young age group.

• 한국표면공학회지
• /
• 제55권5호
• /
• pp.299-307
• /
• 2022

Gold plating is used as a coating of connector in printed circuit boards, ceramic integrated circuit packages, semiconductor devices and so on, because the film has excellent electric conductivity, solderability and chemical properties such as durability to acid and other chemicals. In most cases, internal connection between device and package and external terminals for connecting packaging and printed circuit board are electroless Ni-P plating followed by immersion Au plating (ENIG) to ensure connection reliability. The deposition behavior and film properties of electroless Au plating are affected by P content, grain size and mixed impurity components in the electroless Ni-P alloy film used as the underlayer plating. In this study, the correlation between electroless nickel plating used as a underlayer layer and cyanide-free electroless Au plating using thiomalic acid as a complexing agent and aminoethanethiol as a reducing agent was investigated.

• Journal of Information Technology Applications and Management
• /
• 제30권5호
• /
• pp.83-105
• /
• 2023

The purpose of this study was to investigate the impact of investment fund attributes such as fund product characteristics, returns on fund investment (ROI), internal controls, and after service on fund investor behavior based on investment information technology. In addition, we also examined how customers reinvest through emotional immersion, company trust and company satisfaction of investment firms in the context of fund investment. First, empirical results show that fund product characteristics, returns on fund investment, and financial firms' internal controls and after service act as signals to fund investors to shape their reinvestment intentions. Second, while investors are generally perceived to be interested only in investment returns, this study also shows that they consider both fund product characteristics and fund investment returns, which are core attributes of funds, as well as financial firms' internal control and after service, which are non-core attributes. Third, we find that company trust is an important factor in investors' reinvestment intentions, showing that investors are more likely to reinvest in a fund if they perceive the financial firm to be trustworthy and reliable. Finally, these findings emphasize that investors consider not only tangible aspects of fund products, such as fund product characteristics and returns on fund investment, but also intangible factors, such as financial firms' internal control and after service, and trustworthiness. Taken together, another implication is that the more advanced the investment information technology of financial firms, the more trust, satisfaction, immersion, and reinvestment intentions of investors will increase.

• 경영정보학연구
• /
• 제12권3호
• /
• pp.117-139
• /
• 2010

온라인 게임은 그 자체를 즐기기 위한 대상이기도 하지만, 이를 통해 실생활의 시회적 관계를 강화하거나 연결하는 역할을 수행하기도 한다. 기존 연구들은 온라인 게임 경험이 실생활에 영향을 미치는, 즉 '온라인 게임 의존성'에 기초한 범람 효과에 대해서만 관성을 두어 왔다. 따라서 본 연구에서는 이전 문헌에서 간과한 '오프라인 의존성'이 온라인 행태에 영향을 미치는 범람 효과에 대해 살펴보았다. 이를 위해 경계이론 범람효과, 사회적 자본 사회적 상호작용, 충만감 중독 등의 이론에 근거하여, 충만감과 중독을 상호배타적인 구성개념으로 상정하여 종속변수로 두고, 숙련도, 도전감, 그리고 사회적 상호작용 등을 독립변수로, 그리고 오프라인 의존성을 사회적 상호작용의 조절변수로 하는 연구모델을 개발하였다. 연구모델을 실증하기 위해 온라인 게임 경험이 있는 사용자들 대상으로 온라인 설문 조사를 통해 얻은 197개의 유효한 데이터를 바탕으로 통계 분석을 하였다. 연구결과를 통해 충만감에는 숙련도, 도전감, 사회적 상호작용 모두 정의 영향을 주지만 중독에는 숙련도와 사회적 상호작용만이 정의 영향을 준다는 점을 밝혔다. 또한 오프라인 의존성에 대한 조절효과를 분석한 결과 오프라인 의존성아 낮은 집단이 높은 집단 보다 온라인 게임 중 사회적 상호작용을 활발히 하여 중독 성향이 높아지는 경향을 제시하고 있다.