• Current Photovoltaic Research
• /
• v.8 no.1
• /
• pp.33-38
• /
• 2020

Single-phased SnS thin films have been prepared by RF magnetron sputtering at various deposition pressures. The effect of deposition pressure on the structural and optical properties of polycrystalline SnS thin films was studied using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible-near infrared (UV-Vis-NIR) spectrophotometer. The XRD analysis revealed the orthorhombic structure of the SnS thin films oriented along the (111) plane direction. As the deposition pressure was increased from 5 mTorr to 15 mTorr, the intensity of the peak on the (111) plane increased, and the intensity decreased under the condition of 20 mTorr. The binding energy difference at the Sn 3d_5/2 and S 2p_3/2 core levels was about 324.5 eV, indicating that the SnS thin film was prepared as a pure Sn-S phase. The optical properties of the SnS thin films indicate the presence of direct allowed transitions with corresponding energy band gap in the rang 1.47-1.57 eV.

• Clean Technology
• /
• v.22 no.2
• /
• pp.82-88
• /
• 2016

The loss of activity by coke is an important cause of catalyst deactivation during industrial operation. In this study, hydrogen ratio of reaction condition, which has influenced on coke formation over Pt-Sn catalyst, and regeneration of catalysts activity by coke burning, Pt sintering of coke burning as coke contents, effects of coke formation and deactivation with different Sn contents were confirmed. Pt-Sn-K catalyst supported on θ-alumina and γ-alumina was prepared progressively. Activity of regenerated catalyst for propane dehydrogenation was compared with fresh catalyst by coke burning, after propane dehydrogenation was carried out with different hydrogen ratio at 620 ℃ on fresh catalyst. Regenerated catalyst’s physical characterization such as BET, coke analysis and XRD was investigated. Through catalytic activity test and characterization, Sn contents of catalyst and hydrogen ratio in feed stream could affect coke formation on catalyst surface. Excessive coke makes loss of activity and Pt sintering during air regeneration process.

• Management & Information Systems Review
• /
• v.38 no.4
• /
• pp.137-157
• /
• 2019

Companies are trying to use enterprise SNS for collaboration and speedy decision-making. This study verified the mediating effect of communication between enterprise SNS and job performance, and proved the moderating effect of nationality between enterprise SNS and communication. This study collected survey data of 81 Korean and 81 Chinese from employees who have used enterprise SNS in Korea and China. As results of data analysis, first, enterprise SNS improved job performance through speedy information sharing and error reduction. Second, communication mediated the effect of enterprise SNS on job performance. Third, enterprise SNS increased the level of organizational communication through decreasing the burden of offline face-to-face communication. Compared with Chinese corporate organizations, Korean corporate organizations have high power distances, centralized control, and high superior authority. Therefore, in the off-line communication situation, the subordinate feels the social pressure to follow the command of the superior. Thus communication is one-way and closed. In this Korean organizational situation, corporate SNS can be used as a means to bypass rigid offline communication. In the online communication environment of non face-to-face corporate SNS, anxiety and stress of face-to-face communication can be reduced, so communication between the upper and lower sides can flow more smoothly. The contribution of this paper is that it proved that enterprise SNS promotes communication and improve job performance by reducing the anxiety or stress of offline communication, while according to prior research successful adoption of many types of information systems requires the fit between an organization and its organizational culture.

• Journal of Digital Convergence
• /
• v.18 no.5
• /
• pp.441-453
• /
• 2020

This study conducted a questionnaire survey on SNS users who are conducting K-POP record collection activities using SNS and verified factors affecting the intention to continue K-POP record collection activities. The main methods of analysis were exploratory factor analysis, confirmatory factor analysis, correlation analysis, and path analysis using SPSS 21.0 program and AMOS 21.0 program. The results are summarized as follows. First, compatibility for K-POP record collection activities through SNS has a positive effect on perceived usefulness, and observability also has a positive effect on perceived usefulness and perceived ease of use. Second, perceived ease of use for K-POP records collection using SNS has a positive effect on perceived usefulness. Third, perceived usefulness and perceived ease of use for K-POP records collection using SNS have a positive effect on continuous intention of K-POP records collection activity through SNS. As a result of this study, it suggests that the intention to continue the collection activities of K-POP records using SNS can be explained through the integration of innovation diffusion theory and technology acceptance model.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.2
• /
• pp.548-553
• /
• 2012

The purpose of this study is to explore how use motivation of SNS influences communication activity and SNS media engagement. The major findings are as follows. First, three Factors are identified from the result of scale purification through exploratory factor analysis(EFA) on use motivation of SNS. Three factors of SNS use motivation are information/knowledge acquisition motivation (IKAM), communication/relationship maintaining motivation(CRMM), opinion/information presenting motivation(OIPM). It is found that a significant difference on CRMM between sex. Second, CRMM and OIPM are statistically significant to communication activity. Third, IKAM and CRMM are statistically significant to SNS media engagement.

• Journal of the Korean Society for information Management
• /
• v.29 no.3
• /
• pp.145-167
• /
• 2012

The purpose of this study is to examine the causal relationships among self-efficacy, perceived usefulness, perceived ease of use, perceived playfulness, and reuse intention of SNS. The results of data analysis by structured equation model(SEM) indicate that self-efficacy significantly influences individual's perceived ease of use, perceived usefulness and perceived playfulness. Both perceived playfulness and perceived ease of use affects perceived usefulness on SNS. Individual's self-efficacy, perceived playfulness and perceived usefulness affect reuse intention of SNS. Based on the results, the theoretical and practical implications of this study are discussed.

• Journal of Digital Convergence
• /
• v.6 no.4
• /
• pp.123-135
• /
• 2008

본 논문은 사회네트워크(social network system, SNS)에 대한 사용자의 추가적 사용의도를 개인정보보호의 관점에서 고찰하였다. SNS에서 사용자는 SNS의 운영 시스템과 사용자간 정보의 교류가 이루어지는 SNS사이트라는 서로 다른 두 주체와의 상호작용을 통하여 개인정보의 보호 정도를 인지하게 되고, 이러한 인지정도는 사회네트워크시스템과 SNS사이트에 대한 신뢰에 각각 영향을 미치고, 이 신뢰는 사용자의 사용의도를 증가시킨다는 연구모델을 설정하고 가설을 검정하였다. 주요 연구 결과는 SNS 시스템과 SNS 사이트에 대해 사용자가 인지하는 개인정보보호의 수준은 SNS시스템과 SNS사이트에 대한 신뢰 수준에 통계적으로 유의한 영향을 미치는 반면, 사용자의 추가적 사용의도는 단지 SNS 시스템의 신뢰에 의해서만 영향을 받는 것으로 나타났다.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2009.11a
• /
• pp.44.1-44.1
• /
• 2009

본 연구에서는 Sn과 Mg를 Cu-Fe-P 합금계에 첨가 하였을 때 합금의 미세조직과 물리적 특성에 미치는 영향을 조사하였다. Cu-Fe-P 합금에 Sn과 Mg를첨가 함으로써 생성된 석출상과 합금의 미세조직, 기계적 성질 및 전기전도도를 조사하였다. 합금성분은 OES로 분석하였으며 SEM 및 EDX로 미세 석출상이생성됨을 확인하였다. 본연구를 통하여 Cu-Fe-P 합금계에 Sn과 Mg를 적절히 첨가 함으로써 고강도-고전도도의 동합금 제조가 가능함을 확인하였다.

• The Journal of the Korea Contents Association
• /
• v.16 no.8
• /
• pp.508-516
• /
• 2016

With the rapid development of Social Network Service and with the diversification of user needs, new types of image-based SNS have emerged. Image-based SNS provides customized service to meet users' specified contents needs that have yet to be satisfied in conventional relation-based SNS like Facebook, leading the trend of service diversification. Unlike text-based SNS that has inconvenient view on a small mobile screen, image-based SNS provides the communication way focused on simple text message and image, and thus the main users of the image-based SNS are young people in their 20s who get accustomed to images, rather than text messages. Accordingly, the functions and roles of SNS UI have varied, and usability has been more important. With the users in their 20s who use image-based SNS, this study tried to look into the usability of the image-based SNS. To do that, heuristic evaluation method was applied to find UI problems. The main factors constituting usability were extracted, and user evaluation method was redesigned. Aside from the satisfaction measurement, this study conducted and analyzed a questionnaire survey with users in their 20s who used actual image-based SNS. This study analyzed usability factors that influenced of image-based SNS users. The analysis results are considered to be used as a fundamental material to improve usability in the process of developing social media service.

• Culinary science and hospitality research
• /
• v.19 no.1
• /
• pp.121-138
• /
• 2013

The purpose of this study was to examine the structural relationships among the motives on Social Networking Service(SNS) of restaurants customers, attitude toward SNS, and intention to use. Using a quota sampling method, data were collected from 273 residents of the whole country who were in their 10~50s. The PASW Statistics 18.0 and AMOS 17.0 statistical package were used for the analysis. The hypothesized relationships of the model were tested simultaneously using a structural equation model(SEM). The proposed model provided an adequate fit to the data, ${\chi}^2$=287.558(df=155) p<.000, CMIN/df=1.855 GFI=0.905 NFI=0.887, IFI=0.944, TLI=0.931, CFI=0.943, RMSEA=0.056, RMR=0.025. The results showed that recreational motive(${\beta}$=0.238) and functional motive(${\beta}$=0.467) had a positive effect on the attitude toward SNS. Attitude had a positive effect on the intention of using SNS. The results enable the marketers of restaurants to develop SNS marketing strategies that motivate customers.