Prof. Jian-Kang Zhang (1960-2021)
Tribute
Dear Colleagues,
It is with great sadness that I let you know that a treasured colleague in the Department of Electrical and Computer Engineering, Jian-Kang Zhang, has passed away unexpectedly. Jian-Kang joined our department as an Assistant Professor in 2007, having previously been a post-doc, and was promoted to the rank of Professor last year. He was a profound thinker, who made a number of insightful contributions to the theory and algorithms of wireless communications. One of his papers with a co-supervised student received the Best Young Author paper award from the IEEE Signal Processing Society.
But above his achievements, it was his kindness, and his generosity with his time and insights, that made him such a treasured colleague. He was energized by the opportunities he saw to make us all better, and selflessly did the little things that moved us in that direction. He was an enthusiastic teacher, at both the undergraduate and graduate levels, engaged by the opportunity that he had to help students build themselves a platform of knowledge and insight from which they could launch their careers. Moreover, he was a truly extraordinary mentor, particularly of graduate students, both his own and those supervised by others. He was, simultaneously, their coach and their teammate; a true partner in the exploration that lies at the heart of research.
His loss leaves a hole in our department, and in our hearts, but the memory of what he did for all of us is the balm that will renew us, and will inspire our future. His family has organized a small visitation for this afternoon in keeping with the current provincial restrictions.
May he rest in peace.
Dr. Tim Davidson
Professor and Chair of Departmemt of ECE McMaster University
Jan. 22, 2021
Dr Jiankang Zhang (1960 – 2021) at McMaster – A Tribute
Jiankang came to work for me as a post-doctoral fellow at McMaster in late 1999, being highly recommended by his PhD supervisor Prof. Bao Zheng, who was one of the most eminent scholars in Signal Processing. Jiankang came to McMaster well equipped with mathematical tools and analytical techniques. I was particularly impressed with his mathematical modelling skills and his physical interpretations of mathematical operations and analytic outcomes. His ceaseless creativity quickly brought a refreshing atmosphere to my research group. While initially he was assigned to work on wavelets, very soon Jiankang also became involved with some of the on-going PhD research projects in my group. Inspired by his creative analytic approach, my research students, one after another, produced excellent results and their theses were all awarded prizes. I was amazed at how students worked so well under his influence and gradually let him carry out more and more tasks of co-supervision, meanwhile grooming him to be a possible faculty member of our department by first improving his command of the English language, both spoken and written. Jiankang responded well to my initiative by working very hard at it. Our first joint paper on adaptive filtering took multiple iterations of writing and re-writing, even though he was responsible to write one section, but it finally appeared in 2001. Like with many other things, Jiankang was a good learner. The writing of the second paper was a bit easier, and subsequent papers were easier still.
Meanwhile, Jiankang was offered a similar position at Harvard working with Alex Kavcic. I could not deny him such an opportunity and allowed him to take a leave of absence from my research group. Jiankang returned to McMaster a year later and right away dove into his old job again. Together with some of my students, we turned the prize-winning theses into a series of very good papers published in top-notched journals (two of them actually received IEEE awards). Then, it was time for me to recommend Jiangkang to become a faculty member of the department. It was not an easy job either, for there were strong competitions, but Jiankang prevailed, and joined our department as a faculty in 2007.
For a good career at McMaster, a junior faculty member must be able to show independent development of his research. Thus, the direct collaboration between Jiankang and I was greatly reduced. While he continued his relentless pursuit on MIMO wireless communications, I focused my attention on other issues of signal processing. But that did not stop us consulting with each other, nor did it curb the cross-fertilization between our two groups of students. Jiankang’s subsequent development on his own was astounding, and, after several years of persistent hard-work, he was widely recognized as an international authority in wireless communications and was invited to join the editorial board of several prestigious learned journals.
Jiankang was a scholar and a gentleman in the true sense of the words. A scholar because he was utterly dedicated to his research and teaching, and he would fiercely fight to overcome any hurdle on his way to scientific truth. A gentleman because he would carry out his duty to the utmost and would passionately defend the integrity of his work. He treated his colleagues with great respect and genuine sincerity and was ready to lend a hand of assistance whenever needed. His students to him were like his own children, on whom he showered love and care, and yet his strictness to them was unbending when it came to their work. As a co-worker, he never complained about his share of work, and as a post-doctoral fellow, he never asked for any reward, financial or otherwise, for his hard work. His sudden passing away is not only a great shock to everybody, but represents a huge loss to many of us --- the loss of a great researcher, the loss of a fatherly supervisor, the loss of an ideal collaborator, and above all, the loss of a true friend and a good person!
Early last year, I invited him to join our newly formed quantum technology research group, to which he enthusiastically agreed. We started very well, working together even through the excruciating circumstances of COVID’19, and began to see fruitful results. From now on, this group will just have to continue without Jiankang’s participation.
May he rest in peace!
建康教授千古！
学而不厌 教而不倦
不愧為人師表
高山仰止 景行行止
永留後世哀思
黄榦 Max Wong
Professor Emeritus, McMaster University
郑州大学信息工程学院
Jan. 20, 2021
张建康老师因病于2021年1月17日凌晨7时左右不幸离世。知道这个消息后，大家都感到极度的震惊和悲伤。在过去的几天里，张老师的亲属、朋友、同事、学生从世界各地，以各种形式表达哀思。我有幸和建康共事多年，在各方面从他那里获益良多。我如今仍记得07年8月第一次在建康的办公室里聊天，一见如故，如沐春风。08年我母亲病重，我回国照看，建康在没有任何报偿的情况下主动帮我承担下一个学期的教学任务，我心存感激，却不曾说过一个谢字，往事历历在目，不想今日竟是永诀。建康历经坎坷，今又早逝，实在是堪称不幸。但他为人为学皆为楷模，得到大家广泛的、发自内心的敬重和爱戴，在我认识的人中，不作第二人想，人生一世，夫复何求。
张老师的纪念网页上，微信纪念群里，每天都会有许多真挚的留言，这是张老师人格的最好见证。由于时间限制，无法把这些感人肺腑的留言都读出来。在这里我只读一份张老师外甥女写的悼词。
亲爱的大舅：
至今我仍不敢相信您的离开，
您一直是我们小辈们崇拜的对象，
从我能听懂话时，长辈们就要求我好好学习，长大才能像大舅一样有文化，才能上大学，才能是城里；
您离开的消息我转达给了二舅和三舅，他们和我一样吃惊，问了很多我问题，可是我无从回答……我妈妈今年身体不好，严重的高血压，所以我对她隐瞒了这件事情，这样她仍会期待你回来的那天；
终究世事难料，您在本命年悄悄地离开了，人终归要走这一步，您大概是这些年太辛苦了、现在终于可以去另一个地方休息一下了，不再辛苦奔波。
亲爱的大舅，你一路走好，舅妈和晶晶回国后面我们会照顾……
很遗憾，由于疫情的原因，无法举行正式的大规模的悼念活动。但建康为人质朴，不慕繁华, 今天大家聚在这里，以极简朴的方式向他做最后的道别，想必也是合乎他本意的。
陈隽 Jun Chen
Professor, McMaster University
2021年1月22日
I was deeply saddened by the news of Jiankang's passing. Jiankang was a very dear colleague and friend of mine. He was one of the first people that I met when I came at McMaster in 2002. We were both postdocs and we had neighbouring offices. Our professional relationship grew closer in time. We both had a background in mathematics and shared a love for mathematics and mathematical rigour.
Jiankang was a passionate researcher, an enthusiastic and caring teacher and, above all, a wonderful person. Everybody who knew him could attest to that. His passing is a huge loss. I will miss him deeply!
Rest in peace, Jiankang!
Sorina Dumitrescu
Professor
ECE Department
McMaster University
Jan. 23, 2021
I was saddened to hear of Dr. Zhang’s sudden passing. I had the privilege of being one of Dr. Zhang’s first doctoral students at McMaster University. His enthusiasm, passion, and dedication to research work in wireless communications and signal processing are unparalleled. Dr. Zhang was always readily available to help both his students and colleagues. As I got to know him better he became more of a father figure to me. Although at times he was tough, he also provided me with encouragement and support throughout my time as a doctoral student. I am truly grateful to have known him and for all the opportunities he provided me.
My heart goes out to his family. Rest in peace, Dr. Zhang.
Eleanor Leung, Ph.D.
Assistant Professor
York College of Pennsylvania
Jan. 20, 2021
I am very shocked to learn the sad news that Jian-Kang had left us. My deep condolence goes to his family, his wife, and his son. I will dearly miss him, miss the time he helped me in the research projects and derived difficult math equations. Of course, I always miss the time spent with his family, we made dumplings in his apartment, and we played card games with his wife, such a good time.... although it was many years ago, yet the memories will always stay warm and fresh...
Yanwu Ding
Wichita State University
1/20/2021
I was very shocked and sad when I heard Dr. Jian-Kang Zhang suddenly passed away.
I met Dr. Zhang at McMaster University after he came back from Harvard University. We were in the same research group. What I remember most is that he was dedicated on his research and liked to share his new ideas and research progress. It is this characteristic that I got his new paper which had just been submitted to IEEE Trans. on Information Theory. Later, I obtained the best result on my thesis based on the paper. We met twice after I graduated. He was so dedicated on his work as before.
Rest in heavenly peace, Dr. Zhang.
Fang Xu
@Waterloo, Canada
今晨惊悉张建康教授在加拿大家中离世，不胜哀恸，深感惋惜！
张建康教授学术成绩斐然，在通信信号处理与系统优化设计的多个领域作出了具有突破性和原创性的贡献。他身在海外，却仍心系祖国，为国家培养了众多优秀人才。他平易近人、诲人不倦，在国际通信信号处理学界享有很高的学术声誉，是活跃在我国通信信号处理学界不可多得的杰出人才。
一直以来，张建康教授对郑州大学信息工程学院信息与通信工程学科的发展给予了非常有力的支持。回想过去8年，张教授曾6次来郑开展学术交流与讲学，通过郑州大学国际暑期学校项目，将海外先进的教学理念和前沿课程引入郑州大学；通过博士研究生联合培养和访问学者项目，为郑州大学培养了一批优秀的博士研究生和出色的青年学术骨干。他的英年早逝，不仅是麦克马斯特大学电子与计算机工程系的损失，也是郑州大学信息与通信工程学科团队的损失，更是中加两国通信信号处理学界和中加学术交流领域的重大损失！
斯人已去，音容宛在！友为泪涟，学界怆然！
谨以此代表学院班子成员以及与张建康教授熟悉的各位老师沉痛哀悼张教授，并向张教授的家属致以最诚挚的慰问！
郑州大学信息工程学院
二〇二一年一月十八日
沉痛悼念健康师兄！建康与我亦友亦师，对数学工具的灵活运用是我从他身上学到的最大一点，四年同窗的岁月涌上心头，他的宽厚善良，正直纯朴的点点滴滴都如同昨日历历在目，61岁对于一个有深厚造诣和远大志向的学者而言是一个太年轻的岁数，斯人已去，风范长存。建康兄千古！！
于宏毅教授
国家数字交换中心
沉痛悼念建康！
六七年前，张建康老师访问中山大学，做了一场充满激情的学术报告，给我留下了深刻的印象。
我们上次见面是17年在德国亚琛ISIT，酒会重逢，甚是欢喜，我们最后一天一起出去吃午饭，既畅谈学术又抱怨现实，但他始终鼓励我趁年轻多作为，而我却不难感受到建康的治学理想和待人真诚。
建康回国偶有跟我通电话。
我去年开始组织ICCC 2022，邀建康帮助筹办会议，担任TPC co-chair，籍此，我们之间的联系又密切了，直至前一周我还请建康帮助我审一篇论文。
今早惊闻噩耗，悲痛难耐！友人西去，莫不惋惜，品端行正，待人真诚，故友难得，深深缅怀！
陈立教授
中山大学
2021年1月19日 于穗
张老师的突然离世，是我们无法接受的现实。我们都是与张老师有过交集的人，有的是师生关系，有的是学术同行，张老师的为人和学求上的造诣都让我们钦佩。今天我们以这样的形式来纪念，若张老师在天之灵有知，一定会欣慰，众多的人在怀念他，他在天堂一定不孤独！
穆晓敏教授
郑州大学
勤勉执着老秦人 小波通信真学者 德范常昭
斯人已逝，唯有怀念！兄弟走好!
水鹏朗教授
西安电子科技大学
印象中张建康学长精神特别好，头发又黑又旺，名字中也有建康二字，所以惊闻此噩耗难以置信。
我于2002年在麦大攻读硕士，当时有幸认识张学长，张学长数学功底极好，对我的学术帮助很大，还记得他给我讲解space-time code一眼看穿diversity order的原理，也记得我们在走廊里谈养家糊口压力时张学长认真的表情，更感谢张学长对我硕士论文附录证明的指点。张学长真是一位谦谦君子，善良淳朴，对学术有着诚挚的追求与热爱，对师弟师妹有求必应，关怀备至。我博士毕业后有幸留在了学术圈工作，还曾和张学长谈到学术研究与合作事宜，很遗憾见面次数不多，没想到上次一别成永远，深切缅怀张建康学长。
学弟高飞飞
清华大学
2021年1月21日
惊闻噩耗，让人难以置信。2002-2004在麦大读硕期间，承蒙张老师的指导和帮助，感恩于心。多年前在北京见面聚餐的画面还历历在目。张老师一路走好，深深怀念你！
学生孟芊
于北京
沉痛悼念张建康老师！
初识建康老师还是2011年秋赴加拿大访学期间。建康老师热心帮助我提前考察预定了住宿，各种事项都给我安排的妥妥当当，所以到麦马的第一感觉就是完全没有初到国外的彷徨和思乡之感，适应的非常快。在麦马的一年期间，记忆最深刻的就是我们在张老师办公室讨论问题，张老师平常不太用手机，不喜欢开车，完完全全一种醉心理论研究的学者风范。讨论过程中遇到的数学问题，张老师可以不翻看数学工具书，信手拈来，手写推导，令我非常佩服。合作取得的学术成果，建康老师功不可没。之后我回国，有幸两次请张老师来西安电子科技大学做短期交流，聆听其真诚教诲和指导，画面历历在目，犹在昨日。悲痛心情难以意表，深深缅怀张老师！
宫丰奎教授
西安电子科技大学
2021.1.21 西安
谆谆教诲音容笑貌宛如昨日，严谨治学德高望重精神永存，张老师千古!
许述文教授
西安电子科技大学
张老师的突然离世让我们深感悲痛，总觉得这不是真的，他的音容笑貌就浮现在眼前。
我与建康相识多年，但最近几次相见是在ISIT2017国际会议（德国Aachen），他回西电讲学，以及2018年我去麦马访问。建康平易近人，待人热情真诚。生活上简简单单，不太用手机。学术上勤勉认真，公式信手拈来，追求数学上的完美。我在麦马访问期间，张老师和陈隽老师给了我极大的照顾。建康噩耗传来，我想找一张合影才发现，在麦马都没有跟张老师一起合过影，手头只有一张我们在ISIT2017会议的照片留作纪念。斯人已去，风范永存！建康教授一路走好！
白宝明教授
西安电子科技大学
2021年1月22日
沉痛悼念建康！
初见张建康老师是我16年访问麦马的时候。17年德国亚琛ISIT，再次遇上张老师，我们一起品尝当地的风味美食，畅谈学术人生。19年再次访问麦马，与张老师一起吃饭聊天，一起游尼亚加拉瀑布，美好的时光历历在目。张老师待人真诚，乐观风趣，治学严谨，给我留下了深刻的印象。本来还曾相约有机会来杭州一聚，不想那一别之后尽成永别。
今惊闻噩耗，悲痛难耐！愿建康安息！
杨胜天教授
2021年1月22日 于杭州
前几天听到张老师的消息，我几乎无法相信是真的，心情很悲痛，很惊愕。在我的记忆里，张老师的身体一直不错的。我与张老师曾是很好的球友，虽然有很多年过去了，但往事依然历历在目。
初识张建康，是我在麦大读书的时候。张老师羽毛球水平不错，在麦大ECE系老师和研究生里可以排上名次，那时候与张老师中午在体育馆里厮杀几场羽毛球是让人最舒服的事。张老师打球很积极，有时候中午啃着几片面包就来了，虽然吃的不多，但是体力很好，中午打一个多小时羽毛球，下午还可以继续学习工作，丝毫不耽误。而我基本上下午要趴在办公桌上睡1个小时多，所以很佩服张老师的对时间充分利用。张老师脾气非常好，与他配对打双打，一点没有压力，即使是我的失误，也从来不会指责我。与他在一起，有种如沐春风的感觉，只可惜与他学术交流的甚少。去年夏天，因为工作上的事情，让我与张老师再次有了关联，本想着终于有机会可以请教张老师学术上的问题了，没想到却成了永远的遗憾。
感谢张建康在我人生中最自由的日子里陪我在球场上度过了许多快乐时光。愿Goodman-张建康一路走好 愿张老师安息愿张老师的家人平安、健康！！
冯涛
2021年1月22 于宁波
It is with profound sadness to hear the loss of a colleague Professor Jian-Kang Zhang. Rest in peace, Professor Jian-Kang Zhang! Wish his wife and son to hold up; God will be with you all!
Damu Tang, Ph.D.
Associate Professor
Department of Surgery
McMaster University
My deepest condolences.
Professor Gu Xu
Department of Materials Science and Engineering
McMaster University
It is with profound shock that I heard the passing of Professor Jian-Kang Zhang. My deepest condolences and heartfelt sympathies to his wife, son, and family. Professor Zhang was a wonderful man, amazing teacher, and passionate researcher. He was always so generous and giving of his time. He always greeted and taught us, his students, with warmth, kindness and patience. His classes were a sheer delight, he had such mathematical rigor and derived everything from scratch! Him patiently explaining every step with utmost clarity left a profound impression upon me. He was always available after class or in his office to further lend his expertise, never shying any student away. Professor Zhang holds a special place in our hearts. May God be with him in heaven, and comfort and guide his family. Rest in peace dear professor.
Christopher Cabral
McMaster Undergraduate Class of 2020
Electrical Engineering
Jan. 23, 2020
张老师对郑州大学通信学科的发展给予了非常大的支持和帮助，过去几年他曾6次来郑州大学开展学术交流与讲学，还在麦大指导了多位郑大的博士生和访问学者，为郑大通信学科培养了一批优秀的博士研究生和出色的青年教师，我个人也在和张老师的交流中受益匪浅。
张老师的突然离去实在令我们一时不能接收。愿张老师一路走好！永远怀念张老师！
王宁教授
郑州大学
I was very shocked by the sudden pass away of Prof Zhang. I do not want to believe it is true. I have been working with and learning from Prof Zhang for more than 3 years. We have co-authored six papers together. However, it is unfortunate that we did not get a chance to meet each other physically. I planned to meet Prof Zhang during his visit to China in the summer 2020, which was cancelled due to the pandemic. It is a huge pity that I will not be able to meet and continue to learn from him. However, his rigorous altitude to research and deep insights into system design problems will definitely influence me throughout my career. I will continue to dig into the research area that we are both passionate about. Rest in peace, Prof Zhang.
He (Henry) CHEN
The Chinese University of Hong Kong
2021.1.20 Hong Kong
Dear Dr. Jian-Kang Zhang,
Thank you for helped me transferred from Chemical Engineering to Electrical Engineering!
Sincerely,
Haotian Zhou
McMaster University
得知张老师骤然离世的消息，悲痛万分！我在麦大读本科的时候就上过张老师的信号处理课，读研究生期间又多次担任张老师的助教。张老师在学术上给予我非常多的指导和帮助。
愿老师一路走好！永远怀念恩师！
学生李华莹
2021.1.20
敬爱的张老师，
看着照片中熟悉的办公室门，照片中您亲切的面庞，没想到变成了永久的回忆。
2019到2011在学校的时间，还记得您如沐春风般的音容笑貌，谆谆教诲为我授业解惑，再难的问题经过您的点拨都为我照亮了前方的路。谦谦君子，儒雅学者，是一直以来您留给我们的深刻记忆。
也还记得在Dr Wong的聚会，和您打麻将的场景，师生同欢的温馨让我们这些在外漂泊的学子格外温暖；毕业找工作时您毫不犹豫的帮我写推荐信；我和先生在您的课堂上相识，这是多么特别的缘分。一路走来，您用您的温暖一直帮助着我们，影响着我们，回忆过往，感激涕零。
愿您在天国安息，请师母和家人节哀。
我们会永远想念您！
学生丽莎和Jason
2021年1月21日于多伦多
至今仍然不敢相信张老师的猝然仙逝。悲痛之余， 我想也许只有真正善良，内心宁静的人，才能这样平和安详地离开。在人生的这段旅途中，我庆幸能遇见张老师，能作为他的学生，聆听过他的教诲。他和蔼的笑容犹在眼前，慈父般的声音仍回响在耳边。张老师善良的为人，淡泊的处世，严谨的治学，永远会像他的笑容一样留在我的心中，指引我人生的道路。
张老师，永远怀念您！
学生许睿
2021年1月20日于加拿大
漂泊半生含辛茹苦，一朝驾鹤悲痛万分，张老师千古！
学生韩刚涛
郑州大学
又看到张老师照片，还是忍不住潸然泪下，痛心难以抑制。张老师是一个纯粹的数学家、科学家和学者，对通信信号处理发展作出了巨大贡献，对我个人也是学术研究的启蒙，亦师亦友，受益良多！缅怀张老师！
高向川教授
郑州大学
沉痛悼念张老师。
惊闻张老师溘然长逝，甚为悲痛。2016年在张老师那里作访问博士生，张老师给我的指导无微不至。张老师数学功底深厚，经常在办公室帮我推导公式，一句一句修改我的进展报告，非常有耐心。张老师和蔼可亲，不仅在学术上给我细致严谨的指导，在生活上也多方照顾。一年的留学生活，我受益匪浅，静心看论文想问题，灵活运用数学理论和工具。全程听了张老师讲授的数字通信，有了更加深刻和科学的理解。
2019年夏天张老师回西电，来宫老师课题组交流研讨，张老师思维缜密，讨论了很多目前通信领域的前沿技术，给我们的研究非常有启发。时至今日，我们的研究依然在按照张老师的指导思路上深入。
张老师一路走好，张老师千古！
学生李果
西安电子科技大学
2021年1月19日西安
有幸在博士阶段受到张老师的教诲，在短短两年的相处时间里，张老师渊博的知识、无私悉心的指导、严谨的治学态度和高尚的品格使我受益匪浅。永远怀着感恩的心，祝张老师安息，一路走好！
I was fortunate to be a student of Prof. Zhang during my doctoral period. In just two years of getting along, I benefited a lot from Prof. Zhang's profound knowledge, selfless and careful guidance, rigorous academic attitude, and noble character. With a grateful heart, I wish Prof. Zhang rest in peace.
学生李双志
郑州大学
惊闻张建康老师不幸因病去世，心情非常沉痛。
2009年，我有幸能够在张老师那里访学一年，虽然接触时间不长，但是张老师给我留下了非常深刻的印象。张老师待人和蔼可亲，事无巨细的帮忙解决生活学习中遇到的困难，让我在异乡感受到了家的的温暖，心里一直非常感激。在工作上，张老师不仅严谨认真，同时也非常勤奋刻苦，工作起来经常忘记时间，很多时候张老师的午饭就是吃面包对付一下，治学态度让我无比钦佩。
过去的音容笑貌恍如昨日，然斯人已逝，愿安息！
学生马爽
济南大学
张老师在学术上的严谨治学，以及对学生的宽厚慈爱都让我记忆犹新，张老师千古！也请张老师的家人节哀！
学生杨舵
于温哥华
想见风范空有影，欲闻教诲杳无声。感恩张老师在我访学期间的帮助和指导。才短短分别两个月竟突然变成天人永隔，仍然不愿相信这个噩耗。张老师为人师表，德泽后世。音容笑貌将永远铭刻在我的心中。
愿张老师一路走好！
学生申凌峰
郑州大学
我回国前与张老师的合影，没想到竟之后再没能见面，再也不能聆听张老师的教诲了! 在麦马期间，有幸旁听了张老师的课程，参加了张老师学生的组会，获益匪浅，也多多受到张老师以及张老师团队留学生的帮助，在麦马期间工作和生活的点滴，让我尤难忘记！
学生索龙
西安电子科技大学
鸿儒硕学，良师诤友，受益匪浅，感恩教诲，缅怀追思。愿张建康老师天堂一路走好！
学生甄吉娜
郑州大学
McMaster University
我一直觉得自己很幸运，遇到张老师这样的导师。今年是我做张老师博士生的第四年，张老师就像我的老父亲，在生活上，学习上都给予了我非常多的的帮助和关心。17年在申请麦马的过程中，张老师就热情地帮助我，积极地联系他当时的学生和学校的相关工作人员帮助我解决在申请过程中遇到的问题。我还记得，因为朋友的毕业典礼与我的助教课冲突，张老师主动提出帮我代助教课。在我生病的时候，张老师让我好好休息，叮嘱我去医院看医生，并告诉我在加拿大看病的注意事项，即使我那个假期回到国内，张老师依然不忘关心我的身体状态。疫情隔离以前，我们经常会在办公室里讨论学术，聊聊生活。在讨论我们研究的内容时，张老师都很有激情，节奏清晰明快，每天都有新的创造性的想法提出来，张老师也一直提醒我，一定要有创造性思维。在学术上面，张老师一丝不苟，严肃认真，而在聊生活琐事的时候，张老师又是那样平易近人，和蔼可亲。我喜欢分享我的生活近态给张老师，他也会把他的经历告诉我，关心着我，照顾着我。为了让我每次可以顺利通过会议，他总是会提前告诉我要注意的地方并且耐心地帮我过一遍报告内容，我为我没表现好而难过的时候，他会安慰我鼓励我。看到张老师的同学和朋友都说，这个老师看起来好慈祥啊，总是笑盈盈的。我看到的身边的同学，无论是不是他的学生，如果需要他帮忙的，他都很乐意的去帮助他们。张老师对于我的意义，不仅仅是导师。每次在我迷茫的时候，他都会指引我走向正确的道路。在我处在异国需要长辈的照顾时，他会给予我父亲般的关心。我感恩张老师对我的付出，对我的照顾，我也很幸运成为张老师的学生。张老师对我说，他打算今年回国过年，很久没有在国内过年了，正好今年休息，可以回国过个年。上周四最后一次与张老师通话的的时候，还在聊回国过年和回国打疫苗的事情，没想到，张老师就这么离开了我们。我很遗憾，我现在还不在加拿大，不能在这个时候再为张老师做点什么。事情发生得太突然，刚知道的时候还有种不真实感，我时不时还看一下Skype，看看张老师会不会上线，直到现在越来越多的人知道这件事情，我才不得不承认，张老师真的离开我了，离开我们了，但是张老师的音容笑貌却永远地留在了我们心中。感恩张老师！
学生储晓璇
McMaster University
我在博士期间曾有幸在张老师的课题组访问了一段时间，张老师对我的研究给予了很大的帮助，帮助我最终顺利完成了学业。毕业后张老师又替我写了推荐信，使得我能来到德国继续自己的科研生涯。
张老师对于学问有着非常纯粹的追求，他在研究和学术纪律上对我们的要求也非常严格。可他在生活里又是那样的和蔼。每当看到这张照片，眼前总是浮现起在McMaster和张老师相处的日子，以至于我至今仍无法相信张老师已经离开了我们。
张老师会永远活在我们的心里！
学生肖宇航
2021.01.20于德国帕德博恩
恩师溘然长逝不胜悲痛，然君子气度与谆谆教诲永记于心。愿张老师一路走好。
学生徐立瑾
2021.01.20于蒙特利尔
2017-2018年我大四上了张老师的4TK4。当时大家都觉得张老师是个可爱的艺术家，总是笑吟吟的，头发像个艺术家一样，上课也像艺术家—样充满激情。我们都笑称他是麦马ECE西北英语代表（觉得可爱）后来有幸成了张老师的研究生，他是一个生活中很温柔，但是对待学术却是一丝不苟的人。因为贪玩，总是在学习上惹张老师着急，但是他也从来没有放弃帮助我直到今年9月毕业。最近一次和张老师联系是几个月前我开始工作，张老师也非常开心的鼓励我要认真工作。
上周天佩瑶告诉我张老师去世了，我真的没有办法相信，在我心目中他就是一个无时无刻充满活力的年轻人。好多大学的朋友知道张老师去世的消息，都打电话发消息问我是不是真的，是不是搞错了。
我们都十分挂念张老师，张老师一路走好。斯人已逝，音容永存，也希望张老师的亲人能早日走出悲伤
Chengyujin (Echo) Wang
McMaster University
得知恩师突然离世，仍不愿相信这是真的，总觉还能有机会再听到他爽朗的笑声，仍然还可以接受恩师的教诲。翻看往来的邮件、通话记录，往日情景历历如在眼前，不觉中已然泪流满面。
初与恩师相识是在2011年的12月，临近年假又毕业在即，在济南中心校区信息楼5楼的楼梯口，接到张老师的面试电话，慌乱中语无伦次的回答着张老师的问题。没想到张老师并没有介意我的表现，而是痛快地答应收我做弟子，想来真是人生一大幸运的事情。
第一次与张老师见面则是在2012年的8月25号。那是第一次出国，傍晚时分走出皮尔逊机场，坐上了去学校的车。望着夕阳中QEW上飞驰的车流，内心充满了期待与对未知的忐忑。张老师委托学生关照，吃了来到加拿大的第一顿饭。还记得那是一个闷热的晚上，躺在床上，一夜未眠，既有兴奋也有忐忑。第二天见到张老师的时候，是在他的办公室，没想到张老师的第一个问题是喜不喜欢足球，心里的紧张顿时烟消云散。在我摇头后张老师表示挺遗憾，鼓励我不仅要好好学习，还要加强体育锻炼，和张老师的缘分就这样开始了。博士的第一年在张老师的指导下，简单而快乐，张老师帮着选课，做课题，对生活上也格外照顾。还记得第一篇合作的论文是ICASSP，由于平时事务繁多，只好两个人一起在最后一天赶Deadline，记得截稿日期是11月1号的早上8点，熬了一个通宵，两个人在上午7点多的时候提交了终稿。头一天还十分温暖，风和日丽，而第二天交完论文出门的时候早已是大雪纷飞，两个人一起穿着单衣，笑着各自奔跑回家。就这样和张老师亦师亦友，一起交流思想，讨论问题，甚至是学车心得，一起搬家，帮学弟学妹找公寓，遇到烦心事都可以找他倾诉....
最后一次与张老师的分别应该是2018年的1月12日，记得那天刮着大风，两个人一起飞跑到马路对面的那个停车场，张老师开车送我回租住的公寓，没想到一别竟然是永别。之后经常电话通信，报告近况，遇到科研、教学问题经常与张老师交流。本来邀请张老师2020年暑假来青岛讲座，因几年未见，十分期待，还专门去考察了几个本地小吃，想象着一起聚餐的快乐场景。今年的圣诞节还通了电话，那时候张老师的声音还十分洪亮，一起讨论未来的规划....想到再也没法听到恩师的声音，不禁悲从中来。
张老师是一名纯粹的学者，治学严谨，对待学问一丝不苟，要求严格。在科研上，总是要求我们一定要瞄准解决有意义的问题，做出自己独到的贡献。张老师又是一名水平高超的数学家，对各种复杂问题都能妥善应对，使我们几乎不畏惧挑战任何困难的问题。在生活上，张老师总是尽力帮助我们排忧解难，可以说是无微不至。无论是做科研和工作都离不开张老师的帮助。思绪纷乱，竟语无伦次，人生路漫漫，有这样一位恩师，已是幸运至极，惟愿不负期待。
呜呼哀哉，恩师教诲，永生难忘，深切缅怀吾师！
学生董郑
2021年1月21日于济南
至今还很难接受张老师已去，和他一起讨论学术、一起谈笑的日子仿佛就在昨天。我是张老师2016届的研究生，张老师对我而言不仅是传道授业的恩师，也是和蔼可亲的长辈。刚到加拿大时，心情陌生而胆怯，是张老师热心地帮助我适应环境，给我很多关照，让在异乡求学的我感受到家一样的温暖；在学术上，张老师又是那么地认真，严谨，追求完美，对我总是严格要求，让我在两年的时间里受益良多，他一丝不苟的工作态度影响我至今。他是那样一个善良、质朴的人，总是真诚地帮助每一个人，他的离去很突然，令人难以接受，总觉得他温暖的音容笑貌就在眼前。愿张老师一路走好，我们也会好好学习，工作，以慰张老师在天之灵。
学生于杨
2021年1月21日于北京
My deepest condolences to Dr. Zhang's family. Dr. Zhang was one of my favorite professors during undergrad, and I greatly enjoyed his math courses. He had a great personality and attending his lectures was a joy. He was always very enthusiastic and passionate about everything he taught. I will always remember him fondly and wish his family all the best as they navigate this difficult time.
David Zhitomirsky
McMaster Undergraduate Class of 2010
(Biomedical/Electrical Engineering)
致 Goodman-张建康
2016年夏，刚来到加拿大的我开始了研究生学习。同在一个课题组，很快就认识了张老师。熟识张老师的人大概都有同样的感受，他有着亲和的笑容，真诚的性格，体贴体谅并照顾着每个人。对于我们小一辈的学生，他就像个老父亲，无论生活还是学术上的顾虑，都可以放心地倾诉。可只要面对科研，张老师就变得严肃认真。记得有一次学习小组做展示，我本以为自己准备得差不多了，直到讲的时候才知道，张老师要求每个公式都要会推导，能够讲明白。几个问题下来，我就懵了，也对科研有了新的认识和敬畏。
如此严谨是因为有着极致的热情。张老师真心爱数学，爱推公式，有时在走廊里，也会低着头边走边想问题。在白板上推导，灵感爆发时英文切换中文再切换英文。和其它同学朋友聊起来，无人不欣赏张老师对学术的热情，以及如何被这份热情感染。
所以上周天，当得知张老师在家突发心脏病离世的消息，我第一反应是不相信。这样一个精力充沛、思维活跃的学者，宽厚热情的长辈，怎么就离开了呢?去年春节加拿大新冠爆发前，我们还一起吃饺子，庆祝张老师晋升。往事仍历历在目，现在只剩回忆。
这些回忆，在告知噩耗时与朋友家人一遍遍说起。回忆牵绊着回忆，回忆诉说着回忆。刚才听朋友讲到与张老师离别的场景，又一次忍不住落泪。明天就头七了，希望您能走好。
永远有构成我的一部分的东西，其实是我不了解的，是跟他人相关的。只有当那个他人走了之后，我才发现到我有一部分永远失去了。
学生璨修
二零二—年一月二十三日，于加
在麦大读书的那几年，和张老师打球、讨论学术，无拘无束，快乐简单，惊闻教授仙逝，心情甚是沉重，直到现在都不敢接受这个事实。 张老师，安息！
薛延波
2021年2月3日
It was such a tragedy! I had been worked for him as TA for DSP course in McMaster, I can still recall how Dr Zhang was patient and generous to provide guidance to all his students and share knowledge with his colleagues! Want to express my deep sorrow and condolences for his family’s loss.
Qiuyuan Huang
McMaster University
Feb. 4, 2021
沉痛悼念张建康教授！
闻此噩耗，深表惋惜。
一路走好，师德永存。
麦克马斯特大学
电气与计算机工程系硕士
崔业欣
张老师已经离开我们整一个月了，但我似乎仍然没有走出噩耗传来时的那种震惊，悲恸和惋惜。他的音容笑貌，每每想起，不禁簌簌落下泪来。
张老师为人为师，皆为楷模。他是我和我爱人博士期间的committe member。学业上，张老师曾给了我们巨大的帮助。几年的朝夕相处，我们从师生变成了朋友。张老师为人和蔼可亲，从来不摆架子，我印象里似乎从没见过他发怒的样子。平时走廊里见面，脸上也总是挂着微笑。学术上，但凡有问题请教他，他总是知无不言言无不尽。 张老师对学术研究有一种骨子里的热爱，一旦谈起，他的眼睛似乎就会透出一道光，从厚厚的眼镜片后面闪出来。
我博士毕业大概半年以后，有一天，张老师突然联系我，问题要不要读他的博士后，我当时真是受宠若惊。只可惜当时我已志不在此。那应该是我最后一次和他通话了。很可惜。
张老师，您的善良，您的严谨以及您对生活的乐观，都深深的激励着我们。
愿您在另一个世界安息。
永远怀念。
学生 曹吉海 和 宋琳
2021年2月17日于Ottawa