본 연구는 코팅 방법을 활용한 단결정 양극 소재 연구로서 Ni-rich계 다결정 양극 소재로 부터 단결정 양극 소재를 합 성하여 사이클 구동 시 양극 소재의 안정성을 향상시키고자 한다. 양극 소재에 LixCoO2와 LixSnO3 를 각각 코팅하여 이차입자 내부 혹은 외부에 코팅층이 형성된 양극 소재를 합성한 후 이를 소결하여 단결정 형성에 대한 영향을 비교 하였다. 입자 외부에 LixSnO3가 코팅되어 열처리 된 Ni0.8Co0.1Mn0.1O2(NCM811)의 경우 코팅 처리 없이 열처리된 양극 소재 보다 개선된 수명특성을 보였으나, 단결정화가 이뤄지지 않았다. 입자 내부에 LixCoO2 코팅층이 형성된 NCM811 을 열처리 한 결과 이차입자 내부에 형성된 Co 코팅층이 결정화되어 50회 사이클 후 기준 단결정 양극 소재의 방전용 량인 117.34 mAh·g-1 대비 129.11 mAh·g-1의 높은 방전용량을 나타내었고, 형상제어를 통해 이성적인 단결정화가 이뤄 졌다. 본 연구는 다결정체인 Ni-rich 양극소재의 단결정화에 대한 유요한 통찰력을 제공할 것으로 예상한다.

This study details a researcher’s self-study journey in advancing from a computational thinking (CT) novice to an expert. The researcher went through a four-stage process, with a preliminary literature review preceding the four stages. From the literature review, the computational thinking analysis (CT_AT) tool was developed for use in stage one to analyze science, technology, engineering, art, and mathematic (STEAM) modules. Although no discernable patterns were found in analyzing the five science and five engineering-based modules, the analysis revealed which CT practices were missing or weakly exposed. In stage two activities were suggested to promote these missing or weakly exposed practices. Stage three required the researcher to develop his own STEAM module from the viewpoint of exposing students to CT. The fourth stage was to validate the CT_AT through interviews with pre-service and in-service teachers. These interviews led to changes in the CT_AT tool and, as a result, the researcher produced a guidebook that could be used by teachers in their own CT studies. This guidebook can be used by teachers to develop and become competent in CT skills.

As a new entertainment and social way, online games now have a huge and increasing user group, so it is of great significance to identify the data stream of online games. Using the excellent nonlinear fitting ability of BP neural network and the advantages of global search of genetic algorithm, the initial weights and thresholds of BP neural network are optimized, and the BP neural network model optimized by genetic algorithm is established. The muti-dimensional input information is proposed to identify online game data streams. Through the experimental simulation, it shows that the selected muti-dimensional information and the established model can be well applied to online game stream recognition.

As the initial form of human civilization, games are symbolic interactive behaviors full of emotional communication. With the development of technology, mobile online games have become a new mass entertainment and social media and profoundly changed people's communication mode. Mobile online games have inherited the emotional interaction behavior in traditional games, but also opened up a new emotional interaction mode, reshaping modern people's cognition and communication. Players establish contact with other players through games to produce interactive behaviors, and the essence of interactive behaviors is the process of emotional communication. The rapid development of mobile online games has not only changed the development of social economy, but also changed the economic and social relations between people and society, as well as the emotional cognitive style. This paper holds that the essence of any interactive behavior is the process of emotional communication, which will have a far-reaching impact on society and individuals. Studying gamer and society under modern conditions from the perspective of emotional communication may better understand our life and existence. On the other hand, in the process of emotional interaction, the inevitable conflict causes one or more negative emotions to breed, which may gradually develop into serious social problems, especially adolescent health problems. Therefore, how to make better use of the positive effects of emotional communication in mobile online games in real life, work and study, and how to avoid and solve the social and personal problems that may arise in the process of emotional communication in mobile online games are practical problems that need to be further considered and solved in future research.