a b s t r a c t 26 Transfer learning aims to provide a framework to utilize previously-acquired knowledge to solve new 27 but similar problems much more quickly and effectively. In contrast to classical machine learning 28 methods, transfer learning methods exploit the knowledge accumulated from data in auxiliary domains 29 to facilitate predictive modeling consisting of different data patterns in the current domain. To improve 30 the performance of existing transfer learning methods and handle the knowledge transfer process in 31 real-world systems, computational intelligence has recently been applied in transfer learning. This paper 32 systematically examines computational intelligence-based transfer learning techniques and clusters 33 related technique developments into four main categories: (a) neural network-based transfer learning; 34 (b) Bayes-based transfer learning; (c) fuzzy transfer learning, and (d) applications of computational 35 intelligence-based transfer learning. By providing state-of-the-art knowledge, this survey will directly 36 support researchers and practice-based professionals to understand the developments in computational 37 intelligence-based transfer learning research and applications.38

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Mechanical tuning method using sapphire and copper rods for high temperature superconducting filters is presented. A three‐pole microstrip filter and a two‐pole patch filter were fabricated and tuned. Results show that the center frequency shifts toward lower end in dielectric tuning and toward either lower end or higher end in metallic tuning depending on the local electromagnetic field distribution.© 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1565–1568, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22561

This paper presents the field test of our first demonstration cluster with five base stations (BTS) on code division multiple access (CDMA) wireless communication in China, while each BTS was installed with a high temperature superconductor (HTS) receiver. The HTS receivers have the same centre frequency of 830 MHz, a bandwidth of 13 MHz, and a noise figure (NF) of 0.9 dB. After the conventional receivers in the BTSs were replaced by the HTS receivers, a consequent drive test was carried out. A 2.35 dB decrease of the mean mobile transmit power was observed in the demonstration cluster.HTS filter, demonstration cluster, HTS receiver, CDMA, field test Microwave filters made up of high temperature superconductor (HTS) thin films are widely studied in many countries. Due to the very low surface resistance of HTS thin film in microwave frequency, HTS filter shows an excellent performance with both sharp skirt and very low insertion loss [1,2] . Therefore, it can be used to greatly improve the sensitivity and selectivity of wireless receiver systems. Many applications of HTS filters have been reported, such as in wireless communication system [3] , astronomical telescope [4] , digital Television system [5] , and so on. The Superconductor Technologies Inc. (STI), a company in United States, has reported their applications of a large amount of HTS filters in wireless communication base station (BTS) systems.We have reported our first HTS filter for GSM communication system [6] and our first field trial of HTS receiver on a single code division multiple access (CDMA) BTS [7,8] . In this paper, we present the field test of our first demonstration cluster with five CDMA BTSs of China Unicom Corporation, which is one of the largest wireless communication operators in China. Each BTS of the demonstration cluster was installed with an HTS receiver. After the installation of HTS receivers in the demonstration cluster, a consequent drive test was conducted, and an obvious decrease of mobile handset's mean transmit power was observed. Thus far, all the HTS receivers in the demonstration cluster have been operating stably for more than 18 months.We manufactured five HTS receivers with the same performance and installed them on the five BTSs in the demonstration cluster. The drive tests were carried out by Tsinghua University with support of China Unicom, Beijing Branch. HTS filter systemThe HTS receiver for the CDMA BTS consists of six HTS channels, a vacuum cavity, a mini-type stirling cooler, and electrical controller circuits. Each channel in the HTS receiver includes an HTS filter and a cryogenic low noise amplifier (Cryo-LNA), which both operate at a temperature of about 70 K. The HTS band-pass filters, the key component of the HTS receiver, were designed and manufactured using YBCO thin films on 2-inch MgO or sapphire substrates individually. Each HTS filter has the characteristics of center frequency of 830