Medical imaging plays a more important role in diagnosis and treatment of diseases with the rapid development of big data technologies and hospital information systems.It is thus quite necessary to develop the effective and accurate medical imaging retrieval systems.The key techniques for text-based, contents-based and semantic-based medical imaging retrieval methods were thus elaborated and analyzed with the prospects put forward for the future development direction of medical imaging retrieval techniques.

After a description of the background of hierarchical diagnosis and treatment in China, the total frame-work of hierarchical diagnosis and treatment system in the Internet+era was proposed by analyzing its needs in the Internet+ era, and the main functions of its data center, information system, clinical professional collaboration and public health service were elaborated in order to promote medical health actions and construction of hierarchical diagnosis and treatment system in China.

The classification of social capital involved in health information construction was proposed according to the connotation of social capital and health information construction, and the comprehensiveness, broadness, coop-erative variety, innovative technical application and good development situation of social capital involved in health information construction were dealt with.

Objective:The present study aims at setting up an evaluation index system aiming at providing a set of measurement tools for population & health informatization developing level for administrative departments. Meth-ods: Delphi method, analytic hierarchy process, Synthetic Index Method and some mathematical or statistical meth-ods were used respectively to select the primary indexes, calculate the weight and combined weight of each index, build up the synthetic evaluation mode,and test the evaluation system. Results:According to the results of this work, the evaluation index system has been established which is composed of 6 level 1 indexes, 16 level 2 indexes, and 33 level 3 indexes, and it covers 6 aspects, such as information resources construction, information infrastructure con-struction, information technology application, informatization talents and the information policy, planning, and stand-ards. The weights of these indexes were also calculated. The synthetic evaluation model has been built. Finally, the reliability, the validity and the discrimination of the evaluation system were tested. Conclusions:The evaluation index system has been established, which is able to be used in the evaluation, and to some extent guide the work of popula-tion & health informatization construction.

Objective:To analyze and evaluate population health informatization development of China. Meth-ods:Through this investigation, 8 578 copies of a questionnaire designed for all levels of health administration and parts of primary hospitals were collected. These collected data, were analyzed to evaluate the population health infor-matization development of China through the evaluation index system established for population health informatization development and comprehensive evaluation model. Results:The results of this empirical study indicate that the popu-lation &Health Informatization overall has rapid development , but still has regional differences, and total score of the top 10 provinces are Zhejiang, Shanghai, Jiangsu, Liaoning, Beijing, Chongqing, Tianjin, Hunan, Henan and Gan-su. A statistical difference (p<0. 05) exists in regional development on population & health informatization of Chi-na, therefore serval provinces have obvious weakness or advantage in the construction of informatization. Discussion& suggestions:Government of China should pay attention to evaluation during the construction of informatization;pro-mote a balanced and sustainable development by strengthening financial support and optimizing the input pattern;up-grade regional population health informatization overall according to the information resources as the core;and develop the key priorities of population health informatization depending on practical situation and developing trend.

After the concepts of electronic health records were described , the construction of service system for sharing electronic health records in some major foreign countries was analyzed in aspects of their organizations , poli-cies and laws, criteria for data sharing, data security and privacy protection, with suggestions put forward for the construction of service systems for sharing electronic health records in China, such as speeding up the transforma-tion of governmental management functions , strengthening the guidance for health information construction at macro level, establishing the criteria for data sharing, improving the legal system construction, and attaching importance to privacy protection .

Clinical guidelines,coming into being with the development of evidence-based medicine,are of great significance in reducing medical malpractice and regulating medical behaviors.However,more effective and intelligent measures should be taken for their development and application due to their low utilization and poor compliance of doctors in their implementation.The emergence and structure of clinical guidelines were elaborated with related problems summarized.The knowledge expression models of digital clinical guidelines were analyzed and compared with the challenges faced by the current knowledge expression models of clinical guidelines pointed out.

Construction of regional health information sharing in the United States, Britain and Canada is introduced and analyzed, which include organizational structure, strategic planning, technical infrastructure, operation model, implementation mode and develop-ment characteristics.According to the status of regional health information sharing construction and problems existed in China, the paper put forward relevant suggestions combined with the construction experience of these countries.

〔Abstract〕 In order to advance the comprehensive and balanced development of health and family planning informatization in Beijing on the whole, according to the theoretical method of top -level design and in combination with actual situations of health and family plan-ning informatization in Beijing , the paper studies practices on top -level design from the aspect of technical routes and organization and implementation, and elaborates achievements of top -level design.

The characteristics of public health teaching are discussed in this paper from the aspects of public health curriculum system and difficulties of public health curriculum. The application status of flipped classroom, MOOC, distance learning, online course, Elearning, UMU online education platform and other smart teaching methods in public health teaching are summarized. It is suggested that the level of smart public health teaching should be improved from the perspectives of learning autonomy, deep integration of teaching and technology and construction of smart classrooms.