Zhang Y.,Tangshan College
Journal of Networks | Year: 2012
Based on the security of information transmission through network in the information society, the paper puts forward covert communication technology which is more reliable than the prior encryption algorithm, analyzes channel covertness and information hiding of covert communication technology based on spread-spectrum communication technology, and establishes a covert communication system including image steganalysis, Arnold transformation and scrambling of carrier image, embedding of secret information, generation of encrypted image and recovering of carrier image by image-based covert communication technology. The simulation result shows: in order to ensure there is no serious degrading problem after embedding the secret information, the carrier image must have a large capacity; the larger the scrambling times is, the better the scrambling and encrypting effect is. Therefore, the airspace covert communication algorithm based on spread-spectrum communication technology well achieves safe transmission of information and has good application prospect. © 2012 ACADEMY PUBLISHER.
Wu S.L.,Tangshan College
Zhonghua xin xue guan bing za zhi | Year: 2010
To observe the prevalence, blood pressure change in prehypertensive population and associated cardiovascular risk factors. Data from a prehypertensive cohort defined with the JNC-7 prehypertension diagnostic criteria were obtained in the employees of kailuan group during the health examination between 2006 to 2007 and the same population was revisited between 2008 to 2009 to observe the change of blood pressure and the associated determinants for blood pressure change. (1) There were 25 474 prehypertensive during the 1(st) visit and 8361 subjects developed hypertension during the 2(nd) visit (35.3% in men and 23.3% in women, 27.2% with baseline blood pressure 120 - 129/80 - 84 mm Hg (1 mm Hg = 0.133 kPa) and 43.8% with baseline blood pressure 130 - 139/85 - 89 mm Hg, 34.3% with risk factors and 19.9% without risk factors). (2) Multiple logistic regression analysis showed that the baseline SBP, waist circumference, age, BMI, gender (male), DBP, TC, FBG, TG, LDL-C were the risk factors of blood pressure progression with a RR (95%CI) of 1.052 (1.048 - 1.056), 1.009 (1.006 - 1.013), 1.023 (1.021 - 1.026), 1.063 (1.052 - 1.074), 1.554 (1.442 - 1.675), 1.036 (1.029 - 1.043), 1.064 (1.037 - 1.093), 1.043 (1.024 - 1.062), 1.041 (1.021 - 1.062) and 1.035 (1.000 - 1.072), respectively. A third (32.8%) prehypertensive population progressed into hypertension after two years, baseline SBP, waist circumference, age, BMI, gender (male), DBP, TC, FBG, TG, LDL-C were the risk factors of predicting blood pressure progression.
Wang J.,Tangshan College
International Journal of Pattern Recognition and Artificial Intelligence | Year: 2013
Subspace analysis is an effective approach for face recognition. In this paper, a novel subspace method, called kernel supervised discriminant projection (KSDP), is proposed for face recognition. In the proposed method, not only discriminant information with intrinsic geometric relations is preserved in subspace, but also complex nonlinear variations of face images are represented by nonlinear kernel mapping. Extensive experiments are performed to test and evaluate the new algorithm. Experimental results on three popular benchmark databases, FERET, Yale and AR, demonstrate the effectiveness of the proposed method, KSDP. © 2013 World Scientific Publishing Company.
Guo Y.H.,Tangshan College
Applied Mechanics and Materials | Year: 2014
A granary parameter wireless monitoring system based on Internet is introduced, in which the wireless sensor network is built by using the temperature and humidity sensor and the CC2430 wireless chip, the embedded gateway and the Web server are built by using the embedded ARM chip S3C2410, the system overall structure and hardware circuit and software design are detailed described. In the system, the remote wireless monitoring of grain parameters is realized, users can perform data transmission and monitoring by Internet. The whole system is stable, reliable, low power consumption and it can meet the measurement requirements. © (2014) Trans Tech Publications, Switzerland.
Li S.,Tangshan College
World Information on Earthquake Engineering | Year: 2016
The compressive strength test was proceeded of different concrete test block. The block contained three strength grade C20, C25 and C30, two replacement ratio 50% and 70%, three fiber content 1.0, 1.5 and 2.0 kg/m3. And the block was standard cured. The compressive strength data showed that the compressive strength of recycled aggregate concrete was enhanced with the increasing of fiber content. For concrete of the three strength grade, when the fiber content is 1.5 kg/mm3, the compressive strength was improved to the strength of ordinary concrete without recycled aggregate. © 2016, Science Press. All right reserved.