Dear alumni of the Department of Electrical Engineering and Applied Electronics, Tsinghua University:

Time flies and life extends. In the breezy Spring in April comes the 110th anniversary of the founding of Tsinghua University.

One hundred and ten years of vicissitudes have cultivated thousands of persons of tremendous ability and strength. Generations of people of the Department of Electrical Engineering and Applied Electronics of Tsinghua University have been working hard to practice the school motto of "Self-discipline & Social-commitment" and the department motto of "Strict in learning, and upright in behaving", interpreting dreams with youth, writing chapters with struggle, and contributing wisdom and strength to the national economic and social development, which created Tsinghua's reputation today. On the birthday of the alma mater, we would like to extend our sincerest gratitude and the highest respect to the alumni and people from all walks of life who have cared and supported our development and construction for a long time!

Since 2020, the Department of Electrical Engineering and Applied Electronics has been closely following the development of the school, consciously integrating its own construction with the themes of national development and the times, promoting the connotative development of disciplines, and attaching importance to the construction of disciplines and talent training mechanisms. Especially during the pandemic period, the Department of Electrical Engineering and Applied Electronics has overcome difficulties and improved all work through persistent pandemic prevention and control, ceaseless teaching and research, andconsistentreform and development.

We take the effectiveness of establishing moral integrity in talent cultivation as the fundamental criterion to verify all our work, and follow the guideline to cultivate "high-quality, high-level, complex, and creative" talents, and a lot of new teaching deeds emerged in the past year. Facing the pandemic situation and international changes, the Department of Electrical Engineering and Applied Electronics took the lead in applying a new online/integrated teaching model in the Rain Classroom, and launched a series of "Cloud" experiments to break through the constraints of time and space in teaching; the teaching team of "Principle of Circuits" led by Professor Yu Xinjie won the title of "Outstanding Undergraduate Education Team in Beijing Universities"; Professor Zhu Guiping was invited to China International Television to share her online teaching and integrated teaching experience with teachers of Texas Agricultural and Mechanical University; Ding Qingqing and some other teachers supported the West China online and gave lessons to students in Xinjiang University.

Based on the scientific research tenet of "Cultivating persons standing between the ground and the sky", our department has made a series of globally and academically leading high-quality achievement in response to major national strategic needs. In the past year, the Department of Electrical Engineering and Applied Electronics has led the preparation and publication of the "2020 Annual Report of National Energy Internet Development" and the corresponding technology blue book; the innovative achievement of high-efficiency dielectric energy storage films, electric heating policies influencing China's carbon emission reduction, and new mechanisms for ion battery materials have been published in journals such as Nature Communications and Science Advances. The technical report of the Cigre C1.39 Working Group completed with the leadership ofProfessor Kang Chongqing was officially approved and released; the project "Key technologies and Applications for Coordinated Control of Ten-million Kilowatt Wind Photovoltaic Cluster Source Grid" participated by Associate Professor Lu Zongxiang won the second prize of National Science and Technology Progress Award.

Moreover, the Department of Electrical Engineering and Applied Electronics has amplified its academic advantages and industry influence and hosted or co-hosted more than 20 high-level academic conferences at home and abroad, including the 1st International Symposium on IGCT Technology and Application, the 7th IEEE International Conference on High Voltage Engineering and Application, the 2020 China-Italy Advanced Manufacturing Innovation Forum, and the 4th Forum on Frontier Technologies in Electrified Transport, which generated strong responses in the academic community.

When we recall the past years, never forget more glories are waiting for us to create in the future.

2021 is the first year of the "14th Five-Year Plan" and the year when the two centenary goals meet and transit. Let's take this as a new starting point, establish the ambition to lead the development of scientific research, shoulder the historical mission of educating people for the party and the country, and make unremitting efforts to build the Department of Electrical Engineering and Applied Electronics into a more innovative, more international, and more tolerant world-class department, and write another brilliant chapter worthy of the times!

The development of the Department of Electrical Engineering and Applied Electronics is inseparable from the unremitting struggle and hard work of all teachers and students, and it also benefits from the great concern and strong support of the majority of alumni. There is constant friendship which can neither be cut off by time and space, nor be diluted by flowing water. No matter if you are young, or in your late twilight years, complacent, or successful in your career, the Department of Electrical Engineering and Applied Electronics will always be your strong backing and spiritual home. Leaves are attached to branches at every corner of the earth, and we will definitely continue our wonderful songs and great chapters.

We make this appointment at peaceful world in the Spring of 2021. Tsinghua University will host a series of online celebrations for its 110th anniversary on April 25, allowing us to regain our youth dreams, retell the feelings of home and country, and celebrate the 110th birthday of our alma mater! We are going to carry forward academics and ever-bright traditions, and plan for the future together! Thus we invite you to come, and we are waiting for you!

Kang Chongqing, Dean of the Department of Electrical Engineering and Applied Electronics, Tsinghua University, Chairman of the EEA Branch of the Tsinghua Alumni Association.

Yu Xinjie, Party Secretary of the Department of Electrical Engineering and Applied Electronics, Tsinghua University, Vice Chairman of the EEA Branch of the Tsinghua Alumni Association.