College of Electrical and Information;
Northeast Agricultural University;
Harbin 150030;
China;
Key Laboratory of Pig Breeding Facilities Engineering;
Ministry of Agriculture;
Harbin 150030;
China;
Computer Department;
Harbin Finance University;
Harbin 150030;
China;
Heilongjiang Vocational College of Agricultural Engineering;
Harbin 150008;
China;
greenhouse; environmental; monitoring; remote; service; fuzzy; PID; control;