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- 발행기관 : Kyung Hee University - Graduate School (검색결과 181 건)
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Harishkumarreddy Patnam Kyung Hee University, Graduate School 2023 국내박사
Abstract A study on designing liquid/solid ionic conductive electrode materials for high-performance and stretchable single-electrode triboelectric nanogenerators Harishkumarreddy Patnam Student ID: 2017315489 Department of Electronics and Convergence Engineering The Graduate school of Kyung Hee University Advised by Professor Jae Su Yu With the emerging science and technologies every day, the usage of the internet of things (IoT), electronic gadgets and wearable sensors are routine in a human's life and they consume a lot of power indicating trouble in fulfilling the energy demands for continuous operation. Still, the inconvenience of periodically charging these gadgets for long hours or carrying additional backup power sources all the time restricted their large-scale applications. Presently, most of the energy is generated from non-renewable sources such as fossil fuels and radioactive materials, which have affected nature by polluting the environment by dumping nuclear and fossil fuel waste causing increased carbon emission, global warming, and climate change. Thus, harvesting electrical energy from mechanical energy is a better approach for present and future needs. With the development of the electronic industry, the transition of these devices to flexible, less-weight, and durable designs depends on the use of green energy and self-powered system by storing energy to power these devices. Mechanical energy is abundantly and widely accessible in our daily environment. Thus, the transform of mechanical energy into electricity in ambient conditions is extensively advised to be a better alternative energy conversion approach. Triboelectric nanogenerators (TENG) have attracted significant interest in the present days due to the harvesting of mechanical energy from ambient sources based on the triboelectric effect. Moreover, TENGs has been the ability to harvest mechanical energy from distinct sources such as movements, rotations, flowing water, and deformations. The TENG was extensively utilized to harvest mechanical energies owing to its facile and cost-effective fabrication method, long lifetime, better power density, and fast charge-discharge ability. The TENG output performance is mainly based on the electrode materials, active dielectric layer, morphology, chemical composition, and fabrication methods. Flexible and deformable triboelectric materials such as dielectric layers and conductive electrodes attained great interest because of the demand for wearable electronic devices. Especially, highly flexible and deformable conductive electrodes are a hot research topic. Up to now, several researchers developed novel conductive materials and demonstrated their performance in practical applications. However, the electrical output of the TENG under severe circumstances such as rough weather and extreme stretching conditions without sacrificing the flexibility of the device is a challenging task. Therefore, research is still ongoing to develop better materials for wearable electronics under extreme conditions. In the process of researching the new novel conductive materials, in chapter 3, we demonstrated an easy preparation process to fabricate a highly conductive hydrogel and organogel to be utilized as an electrode for high-performance TENGs. Particularly, the hydrogel modified with additional dopants showed excellent electrical and mechanical properties. The enhanced output performance of the devices is explained by additional characterizations. The biocompatible organogel was prepared by facile method and studied their electrical properties. The organogel-based TENG exhibited outstanding results and the preparations are facile, scalable, and cost-effective for wearable TENG operated in single-electrode mode. In chapter 4, we also presented the liquid conductive electrodes based on the polyaniline polymer (PANI) and carboxymethyl cellulose sodium salt (CMC) for flexible, stretchable, and wearable TENGs. The fabricated TENG with CMC ionic conductive liquid showed desirable performance under extreme environmental conditions. Additionally, the CMC ionic conductive liquid-based TENG was used as a wearable sensor and it showed significant results. The demonstration of the TENG under extreme environmental conditions indicated that the TENG is desirable for practical applications. Besides, the PANI liquid electrode showed enhanced output performance under extremely deformable conditions. The obtained results show that the ionic conducive liquid electrodes can serve as an excellent choice for wearable electronics. Keywords: single electrode; Conductivity; Triboelectric nanogenerator; wearable sensors; Energy harvesting
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The Influence of SNS Characteristics on Travel Decision among Chinese SNS Users
Feng Han Kyung Hee University Graduate School 2016 국내석사
There has been rapid growth in the world of social networking service (as known as “SNS”). SNS is a popular and important channel for people to communicate in an easier and more convenient way with each other. Because it’s used widely and popular, SNSs, especially Weibo and WeChat in China, have become one of the most important and efficient ways for marketers to attract individuals’ attention and have an effective marketing, particularly in tourism industry. This study involves Chinese tourists’ travel decision making influenced by SNS characteristics; its purpose to make contributions to tourism marketing and travel decision research. Information quality, system quality, timing, reciprocal communication and value are five variables for analyzing SNS characteristics. Three factors, consisting of tourists’ perceived ease of use (PEOU), perceived usefulness (PU) and satisfaction toward SNS using, are used as mediators between SNS characteristics and travel decision making. This study makes an integrated research model from TAM model, D & M IS success model and extended D & M Model to analyze the influence from SNS characteristics, PEOU, PU and satisfaction to travel decision. For the purpose of the research, 302 valid survey responses were collected online by targeting Chinese tourists using Weibo and WeChat. Frequency analysis was conducted to examine the answers’ demographic and the general characteristics. Reliability and an exploratory factor analysis (EFA) was carried out to confirm the reliability of measurement items by SPSS 22.0 and a Confirmatory Factor Analysis (CFA) was utilized to assess the construct validity by AMOS 21.0. Regression analysis was carried out to test the structure relationships among the latent constructs in order to test the hypothesis. The study results show that the new combined research model has a good model fit for analyzing SNS characteristics, PEOU, PU, satisfaction and travel decision. All eight hypotheses proposed in this study were revealed to be supported by the empirical results. SNS characteristics have positive significant influence on travel decision making. What’s more, PEOU, PU and satisfaction have positive mediating effects between SNS characteristics and travel decision, except that PEOU does not have mediated effect between reciprocal communication, value and travel decision. The most important influential factor to travel decision is satisfaction, following by PU. SNS characteristics influence satisfaction strongly, and influence more on PU than PEOU; in addition, PU has stronger influence on satisfaction than PEOU. Regression results also show that tourists consider PU more influential than PEOU. Overall, this research validated the influences of SNS characteristics to travel decision with the mediating effect of PEOU, PU and satisfaction. The findings of this research could be helpful for future researchers, educators and marketers involved in the field of tourism and SNS.
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