Heating performance of a ground source heat pump system installed in a school building

The heating performance of a water-to-refrigerant type ground source heat pump system is represented in this paper under the actual working conditions of the GSHP(ground source heat pump) system during the winter season of 2008.Ten heat pump equipments with the capacity of 10 HP each and a closed vertical typed-ground heat exchanger with 24 boreholes of 175 m in depth were constructed.We investigated a variety of working conditions,including the outdoor temperature,the ground temperature,and the water tempe...     

Synthesis, Characterization, and Photovoltaic Properties of Soluble TiOPc Derivatives

We have synthesized soluble TiOPc derivatives containing alkoxy groups for use as additives in dye-sensitized solar cells (DSSCs). The DSSC devices containing these TiOPc derivatives exhibited short-circuit current densities of 8.49~10.04 mA/cm² and power conversion efficiencies of 2.73~3.62 % under AM 1.5 illumination and 100 mW/cm² irradiation.     

Scrap tire/aggregate composite: Composition and primary characterizations for pavement material

A new type of pavement material using scrap rubber, the so-called elastic and permeable pavement material (EPPM), was proposed in this study. EPPM is a new material to overcome water permeability and brittleness, which are defects of the conventional rubber asphalt and cement concrete, respectively. Those problems could be solved by introduction of grounded scrap rubber and structural design of EPPM. Results showed that key factors affecting the compressive strength and the water permeability of EPPM were the size of grounded scrap rubber and aggregate, the amounts and property of the binder. The optimum level of binder was about 8 wt%. The compressive strength and water permeability of EPPM were 1.1 and 116 times higher than those of conventional porous cement concrete, respectively.     

Synthesis and rheological properties of poly(styrene-co-butyl methacrylate) as an ink vehicle

Poly(styrene-co-butylmethacrylate) as an ink vehicle was synthesized using free radical polymerization. The molecular weights and monomer ratios in copolymers were determined. According to the results, the molecular weight could be controlled by the addition of a chain transfer agent and the copolymer ratio was nearly the same as the mole ratio of the monomer feed. The effect of the copolymer ratio on the rheological property was also studied. The polymer melt resembled a very viscous Newtonian fluid at a rate above the critical shear rate. Also, it is possible to synthesize a copolymer whose activation energy value is independent of the shear rate. The viscosity and melt behavior of the copolymer can be controlled with proper blending.     

A genetic algorithm for PDA optimal path generation using GPS

Many web-sites provide a variety of electronic mapping services. Currently, many studies are underway to develop vehicle navigation software for PDA maps using GPS data. Popular among these services is one that computes the optimal route between two locations input by a user. This service of computing the optimal route plays an important role in vehicular navigation and distribution and delivery industries. The calculation and manipulation of the optimal route for navigation and vehicular delivery system improve the efficiency of vehicle use and delivery times, thereby reducing costs. The purpose of this study is to compute the optimal route by considering the direction of distribution vehicles and the delivery location and develop a genetic based algorithm that quickly generates the shortest route for delivery. The algorithm also generates the optimal route for itineraries having several destinations.     

A segment version transcoding for client-centric wireless mobile media streaming

An object segment similarity function is taken into account from the continuous media frames to measure the individual streaming profit of certain segment versions of a media object.Therefore,a new segment version-based transcoding （SVT） mechanism is derived for a quality of service （QoS） of client-centric media streaming in wireless mobile networks.The derived function utilizes the fuzzy similarity of certain segment versions of an object.This mechanism provides the effectiveness of reduction of the stream startup latency among segment versions,and the average access of each version.Thus,the proposed segment version transcoding mechanism reduces packet loss which in turn increases streaming performance and throughput.The performance of the partitioned segment versions is simulated and some segment versions are completed.The simulation results show that the proposed mechanism outperforms the other mechanisms in average cache hit ratio and in average startup latency ratio.     

Similarity measure design for high dimensional data

Information analysis of high dimensional data was carried out through similarity measure application. High dimensional data were considered as the a typical structure. Additionally, overlapped and non-overlapped data were introduced, and similarity measure analysis was also illustrated and compared with conventional similarity measure. As a result, overlapped data comparison was possible to present similarity with conventional similarity measure. Non-overlapped data similarity analysis provided the clue to solve the similarity of high dimensional data. Considering high dimensional data analysis was designed with consideration of neighborhoods information. Conservative and strict solutions were proposed. Proposed similarity measure was applied to express financial fraud among multi dimensional datasets. In illustrative example, financial fraud similarity with respect to age, gender, qualification and job was presented. And with the proposed similarity measure, high dimensional personal data were calculated to evaluate how similar to the financial fraud. Calculation results show that the actual fraud has rather high similarity measure compared to the average, from minimal 0.0609 to maximal 0.1667.     

UHMWPP／UHMWPE合金纤维非等温结晶动力学研究

运用DSC手段研究了UHMWPP／UHMWPE合金纤维的等温结晶行为，对所得的实验数据用修正Avrami方程的Jeziorny法进行处理，发现随冷却速率的提高，半结晶的时间t1/2缩短，表明冷却速率加快时，结晶速率也随之加快，纯UHMWPP主要是以三维球晶的方式进行结晶生长，UHMWPE的加入起到核剂的作用，随着成核剂含量的增加，UHMWPP的结晶维数将降低.