Solar energy has been recognized as an alternative energy source that can help address fuel depletion and climate change issues. As a renewable energy alternative to fossil fuels, it is an eco-friendly and unlimited energy source. Among solar cells, thin film Cu2ZnSn(S,Se)4 (CZTSSe) is currently being actively studied as an alternative to heavily commercialized Cu (In,Ga)Se2 (CIGS) thin film solar cells, which rely upon costly and scarce indium and gallium. Currently, the highest efficiency achieved by CZTSSe cells is 14.9 %, lower than the CIGS record of 23.35 %. When applied to devices, CZTSSe thin films perform poorly compared to other materials due to problems including lattice defects, conduction band offset, secondary phase information, and narrow stable phase regions, so improving their performance is essential. Research into ways of improving performance by doping with Germanium and Cadmium is underway. Specifically, Ge can be doped into CZTSSe, replacing Sn to reduce pinholes and bulk recombination. Additionally, partially replacing Zn with Cd can facilitate grain growth and suppress secondary phase formation. In this study, we analyzed the device’s performance after doping Ge into CZTSSe thin film using evaporation, and doping Cd using chemical bath deposition. The Ge doped thin film showed a larger bandgap than the undoped reference thin film, achieving the highest Voc of 494 mV in the device. The Cd doped thin film showed a smaller bandgap than the undoped reference thin film, with the highest Jsc of 36.9 mA/cm2. As a result, the thin film solar cells achieved a power conversion efficiency of 10.84 %, representing a 20 % improvement in power conversion efficiency compared to the undoped reference device.

The purpose of this study is to analyze the effects of English learning through social media on the perception and affective factors of college students. To this end, researchers examined whether the educational use of YouTube and KakaoTalk, popular among college students in Korea, differs according to English improvement, affective factors, and English level. The subjects of this study were 63 freshmen majoring in Medical Convergence, who were taking college English at C University located in Gangwon-do. An online questionnaire was used for data collection. The collected data were analyzed using Jamovi, a statistical program. The results are as follows. First, the participants positively changed the perception that the use of social media had on the overall improvement of English. Second, the affective domains such as self-confidence, attitudes, values, beliefs, and interests of the participants also changed positively. Finally, it was confirmed that social media has educational value regardless of English level.

The purpose of this research study is to identify the perceptions of both primary ELL(English Language Learner)s and English teachers on MMP(Multimodal Media Production)-embedded English instruction at a primary English class. In order to answer this question, 182 primary ELLs and 2 English teachers participated in this research. A questionnaire survey was administered to the focal participants and an open-ended interview was conducted with the teachers. The results show that overall perceptions on MMP were comparably high among ELLs, and there was significant difference between genders, grades and English levels in terms of learning interest. The teachers’ interview revealed that MMP would trigger deeper understanding of the lesson and ELLs’ voluntary active class participation by heightening motivation, self-confidence and interest in learning English. In sum, the implementation of MMP-embedded English instruction has positive pedagogical effects for young ELLs since it may promote essential literacy skills in the 21st century as well as help in affective domains.

β-phenylethyl isothiocyanate(PEITC) is a component derived from cruciferous vegetables and has been demonstrated to fight many types of cancers through various molecular pathways. In the present study, we focused on its effect on the induction of apoptotic cell death to inhibit cell growth and its molecular mechanism in HSC-4 human oral cancer cells. A colorimetric MTS assay was used to examine cell viability. The apoptotic effect and was investigated using DAPI staining and the molecular target and mechanism of PEITC-mediated apoptosis were determined by Western blotting. The result showed that PEITC inhibited oral cancer cell growth and induced apoptosis via extrinsic signaling pathway evidenced by the activation of caspase 8, truncation of bid protein and induction of death receptor(DR) 5. DR5 protein level was increased through the activation of p38 and c-Jun N-terminal kinase(JNK). These results from this study strongly suggest that DR5 is a potential molecular target for PEITC-induced apoptosis in oral cancer via p38 and JNK.

According to the preceding survey on insect pests of the green perilla, Perilla frutescens var. japonica HARA, The major pests were Aphis egomae Shinji, Pyrausta panopealis (Walker), Tetranychus urticae Koch, Polyphagotarsonemus latus Banks, Tetranychus kanzawai Kishida at Guemsan, Chungnam, 2004. Aphis egomae causes nearly 100% injury of the green perilla in uncontrolled green houses. A field study was conducted to estimate economic injury levels (ElLs) and control thresholds (CTs) for A. egomae injuring green perilla in green houses. Different densities of A. egomae ranged from 1 to 80 aphids per 100 plants in early inoculation. The mean injurying rate of plant was 2.4% to 40.5% at the end of June at differently inoculated levels. The economic loss time calculated by the ratio of cost managing aphid to market price (C/V) (C: cost managing aphid, V: Market price) in early season (from May to 13. June) was 5.8% and in peak season (from 13. June to 30. June) was 9.3%. Economic injury level in early and peak season was 5.3 aphids per plant and economic injury levels in peak season were 0.6 aphids per plant and 7.6% injured rate of plant. The control thresholds calculated by 80% level of economic injury level in peak season were 0.5aphids per plant and 6.1% injury rate of plant, respectively.

The increasing numbers of ELLs (English Language Learners) in U.S. classrooms has prioritized into building quality teacher education programs for teachers so that they have the pedagogical tools necessary to support their students. A continued focus with professional development at the local, state, and national level has gained momentum to ensure that mainstream teachers have appropriate cultural competence skills and research-based practices to meet students’ diverse linguistic and academic needs. This mixed method study on 144 PK-12 teachers with five or less years of experience highlighted the importance of teachers’ perceptions and efficacy beliefs in working with ELLs. Five in-depth cases illustrated a support for professional development in creating high efficacious behaviors for teaching ELLs. Additionally, a quantitative finding augmented teacher narratives to reveal a statistical significance in efficacy beliefs for teachers who received adequate inservice professional development as opposed to teachers who were not afforded those opportunities.