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Two new (1 and 2) meroterpenoids were isolated from the bark of Cinnamomum cassia. Their structures were determined by spectroscopic analyses and chemical methods. Antioxidant activities of 1 and 2 were evaluated by the ORAC and DPPH radical scavenging assays, and the results revealed that compound 2 displayed oxygen radical absorbance capacity. The discovery of compounds 1 and 2 added new members of this kind of natural product.

Introduction: High-tension electricity can cause devastating injuries that may result in abdominal wall loss, visceral damage, and sometimes major threat to life. The visceral organ may be exposed after debridement and require flap cover, but the tensile strength of abdominal wall may be lack even if flap transplanted. Methods: From April 2007 through May 2015, 5 patients with severe abdominal electrical injury were treated at our hospital. Exploratory laparotomy was performed based on their clinical manifestations and debridement findings of abdominal wall at early stage, and decision regarding technique for reconstruction of abdominal wall was based on an assessment of the location and extent of the defect. Medical records were reviewed for these data. Results: Clinical evaluation and debridement findings of the abdomen revealed 4 patients with suspicious visceral damage. Laparotomy was performed in 4 cases, and revealed obvious lesion in 3 cases, including segmental necrosis of small intestine, partial necrosis of diaphragm, left liver and gastric wall, and greater omentum. Five patients underwent abdominal wall reconstruction using island retrograde latissimus dorsi myocutaneous flap or free/island composite anterolateral thigh myocutaneous flap. All flaps survived, abdominal bulging occurred in 3 cases after follow-up of 12 to 36 months. Conclusions: The clinical manifestations and wound features of abdomen collectively suggest a possible requirement of laparotomy for severe abdominal electrical burns. Retrograde latissimus dorsi myocutaneous flap or composite anterolateral thigh myocutaneous flap is an effective option for reconstruction of abdominal wall loss, the long-term complication of abdominal bulging, however, remains a significant clinical challenge.

The hand gesture shape is the most remarkable feature for gesture recognition system. Since hand gesture is diversity, polysemy, complex deformation and spatio-temporal difference, the hand gesture shape descriptor is a challenging problem for gesture recognition. This paper presents a hand gesture shape describing method based on energy-ratio and normalized Fourier descriptors. Firstly, the hand gesture contour of the input image is extracted by YCb’Cr’ ellipse skin color model. Secondly, the Fourier coefficients of the contour are calculated to transform the point sequence of the contour to frequency domain. Then the Fourier coefficients are normalized to meet the rotation, translation, scaling and curve origin point invariance. Finally, the items of normalized Fourier coefficients are selected by calculating energy-ratio information as the hand shape descriptors. For validating the shape descriptors performance, the hand gestures 1-10 are recognized with the template matching method and the shape descriptor method, respectively. The experiment results show that the method can well describe the hand shape information and are higher recognition rate.

OER(Open Educational Resources)is no longer strange to us. It is developed rapidly and had many achivements. It has attracted a great attention by UNESCO and many countries. The research in OER is deepend gradually. Many scholar have been attracted by OER. In this paper, we will present four aspects of analyzing the influential factors in learner's using of OER. They are performance factor, difficulty expectation, resource conditions and group influence. There are some ideas for the OER's future development and construction. These will be a reference to the further research.