Search

Determining how to achieve sustainable development and protection of historical districts is a worthwhile research topic. As a vital way to update urban space, tourism development in historical districts is an effective tool for redistributing urban functions and increasing urban vitality. This paper takes the Insa-dong in South Korea as a case study for the evaluation of tourist satisfaction in historical districts, based on 550 questionnaires. The questionnaire contains 33 evaluation indicators, and the subjects′ subjective judgment and satisfaction with Insa-dong are measured in the form of the Likert scale. Using SPSS to analyze tourists' satisfaction with historical districts, this studyfinds that: (1) The tourist satisfaction evaluation of Insa-dong includes six dimensions in total: “Embodiment of historical elements”, “The blend of tradition and modernity”, “Industry distribution and type”, “Consumer demand”, “Street layout and function” and “Landscaping”. (2) “The blend of tradition and modernity” has the highest weight while “Industry distribution and type” has the lowest one in the analysis of factors influencing overall satisfaction. (3) The analysis of the common factor weights and the common factor satisfaction levels shows that “The blend of tradition and modernity” and “Street layout and function” are the parts that need to be improved. “Consumer demand” also has a lot of room for promotion. The research results will be beneficial for enhancing the tourist experiences of historical districts and they provide a theoretical basis and practical experience reference for effective protection and sustainable development of historical districts.

This paper proposes a distributed power control scheme based on the constrained model predictive control (MPC) for the underlay cognitive satellite terrestrial networks (CSTNs), where the primary satellite communication network coexists with the secondary terrestrial mobile network. We model this power control problem as a closed-loop dynamic control system with the inner loop and outer loop. On the basis of combining target power control (TPC) algorithm in the inner loop and tracking of flexible target signal to interference plus noise ratio (SINR) in the outer loop, we develop a corresponding state space expression of the problem where the fluctuation of each channel power gain is formulated as the exogenous disturbance input so that we do not need the accurate instantaneous channel state information (CSI). Then we design a SINR regulator in the outer loop, which is a constrained model predicted controller with rolling optimal operation subject to the interference temperature constraint obtained by calculating a linear matrix inequality. Finally, we obtain our constrained model predictive power control algorithm. In contrast to the previous static power control schemes based on the optimization theory that highly depend on the known instantaneous CSI and large signalling exchanges, the proposed scheme only needs locally measured information and outdate feedbacks. The performance of the proposed algorithm is shown to be effective through computer simulations.

With a comparatively mature state of country park development for China, Hong Kong serves as a model that is emulated by many cities in Mainland China. In contrast, Beijing started to establish country parks relatively late, but along with the nascent “Country Park Loop”, achieving scientific and reasonable operation management is now the major challenge facing Beijing. By comparing the differences between Hong Kong and Beijing country park management in terms of positioning, management organization, legal guarantees, supporting facilities and education, this paper explores the factors of social development stage, urban developmental history and planning, the wilderness concept and financial support which are responsible for those differences. In order to achieve sustainable development, this paper shows that Beijing country parks should seek corresponding solutions according to their own characteristics.

The location of the homestay agglomeration is closely related to its proximity to the resources environment and the humanities and social environments. From the macroscopic and microscopic aspects, this study uses the analytic hierarchy process and the expert consultation method to construct a relatively comprehensive evaluation system including economic and environmental factors, tourism development factors, geographical environment factors, supporting facilities and operating conditions. The evaluation index system consists of 20 evaluation indexes and 35 evaluation factors. Taking the Baileqiao in Hangzhou and Qianjiadian Town in Beijing as examples, the evaluation indexes are verified and applied. The results show that the main factors affecting the location of the homestay agglomeration are the economic and environmental factors. The evaluation index system is composed of a target layer, a comprehensive evaluation layer, a factor evaluation layer and an index layer. The target layer takes reasonable location of the homestay agglomeration as the overall objective; the comprehensive evaluation layer includes economic and environmental factors (0.4396), tourism development (0.3039), geographic and environmental factors (0.1405), and supporting facilities (0.0545). The comprehensive evaluation scores of Baileqiao and Qianjiadian homestay agglomerations are 92.644 and 88.734, respectively, indicating that both are reasonable homestay sites. This study is helpful for promoting the understanding of the homestay agglomeration location selection and the development and construction of homestay agglomeration sites.

Proceedings Of The 6Th International Bci Meeting: Bci Past, Present, And Future

Geochemical characteristics of scandium are described with respect to its source, evolution and correlation with REE as observed in Late Sinian and Early Cambrian phosphorites and tuffs in Guizhou. Comparison of chondrite-normalized REE patterns and some other parameters between the phosphorite and tuff shows that scandium and REE are most likely to have been derived from earlier or contemporaneous marine volcanics or tuffs, with no indication of genetic link to the purple shales, siltstones and dolomites in the area. The conditions under which the Sc-bearing phosphorites were formed are discussed in the light of sulfur isotopes and Eh-Ph constrains.

The system with flexible rotor supported by magnetic bearings is set up, in which the locations of the radial magnetic bearings can be changed. Influence of the bearing locations on dynamic characteristics of the system is studied by theoretical analysis, experimental modal analysis and actual operation of the system. The results show that the bending modal damping of the system varies obviously with the bearing locations. When the locations of the radial magnetic bearing are far from the nodes of the bending mode shapes, the vibration of the rotor can be effectively restrained when it operates on the bending modal frequencies.

Some valuable records of seismic profiling at the West Pacific Ocean have been obtained by using DDC1‐1 geosonar. A significant discovery is that a layer of sediment, the thickness of which is more than 500 m, exists at the area of Ryn‐Kyn Ocean Trench, where the water depth is over 6700 m. The DDC1‐1 geosonar consists mainly of a 30 000‐J sparker as a strong wideband sound source and a 50‐m‐long streamer, including 20 equally separated hydrophones and an echo‐processing system. Several new techniques have been developed for the improvement of both penetration and resolution of seismic profiling, such as: (1) time‐varying filtering—the frequency band of the sonar receiver can be varied in real time with the variation of the echo travel time according to an adjustable pattern depending on the acoustic attenuation of marine sediments; and (2) synthetic‐aperture processing—an exponential accumulator is used for stacking a series of echoes from some certain subsurfaces of sediments in real time corresponding ...