To prevent a vehicle from departing the lane in assistant or automatic steering, real-time vision-based detection of lane is studied. The system architecture, detecting principle and lane model are described. Then the...To prevent a vehicle from departing the lane in assistant or automatic steering, real-time vision-based detection of lane is studied. The system architecture, detecting principle and lane model are described. Then the detecting algorithm of the lane image is discussed in detail. In this algorithm, several proper sub-windows in one image are first selected as the processing regions. To every sub-window, by means of such steps as appropriate pre-processing, edge detection and Hough transform, etc., the lane description features are extracted. Experimental results reveal that this detection method is of good real-time, high recognition reliability and strong robustness, etc., which can provide the decision-making foundation for the following automatic or assistant steering to some extent.展开更多
目的:研究短梗五加果多酚(Acanthopanax sessiliflorus fruit polyphenols,ASFP)对大鼠动脉粥样硬化(atherosclerosis,As)的预防作用,并探讨其作用机制。方法:40只雄性SD大鼠随机平均分成4组,每组10只。采用高脂饮食结合腹腔注射VD3的...目的:研究短梗五加果多酚(Acanthopanax sessiliflorus fruit polyphenols,ASFP)对大鼠动脉粥样硬化(atherosclerosis,As)的预防作用,并探讨其作用机制。方法:40只雄性SD大鼠随机平均分成4组,每组10只。采用高脂饮食结合腹腔注射VD3的方法建立As模型,不同剂量ASFP给药组自造模开始之日起分别灌胃150、75 mg/(kg·d)的ASFP,空白组和高脂饮食组大鼠灌胃等量生理盐水,各实验组连续处理12周后,检测大鼠血清生理生化水平并计算As指数;苏木素-伊红染色观察大鼠主动脉As病变情况;Western blot检测主动脉中黏附分子和丝裂原活化蛋白激酶(mitogen-activated protein kinase,MAPK)信号通路关键基因的蛋白表达水平。结果:与高脂饮食组相比,ASFP能显著降低大鼠血清中的血脂、黏附分子和炎症因子水平,减少主动脉中的脂质沉积,改善各层结构排列紊乱,显著降低主动脉中细胞间黏附分子-1、血管细胞黏附分子-1、磷酸化p38和磷酸化细胞外信号调节蛋白激酶1/2(phospho-extracellular signal regulated kinases 1/2,p-ERK1/2)的蛋白表达量。结论:ASFP具有预防As的作用,其作用可能与其降血脂和抑制p38 MAPK和ERK1/2 MAPK信号通路,进而抑制炎症因子的表达有关。展开更多
Autoimmune pancreatitis (AIP) is a newly described entity of pancreatitis in which the pathogenesis appears to involve autoimmune mechanisms. Based on histological and immunohistochemical examinations of various organ...Autoimmune pancreatitis (AIP) is a newly described entity of pancreatitis in which the pathogenesis appears to involve autoimmune mechanisms. Based on histological and immunohistochemical examinations of various organs of AIP patients, AIP appears to be a pancreatic lesion reflecting a systemic "IgG4-related sclerosing disease". Clinically, AIP patients and patients with pancreatic cancer share many features, such as preponderance of elderly males, frequent initial symptom of painless jaundice, development of new-onset diabetes mellitus, and elevated levels of serum tumor markers. It is of uppermost importance not to misdiagnose AIP as pancreatic cancer. Since there is currently no diagnostic serological marker for AIP, and approach to the pancreas for histological examination is generally difficult, AIP is diagnosed using a combination of clinical, serological, morphological, and histopathological features. Findings suggesting AIP rather than pancreatic cancer include:fluctuating obstructive jaundice; elevated serum IgG4 levels; diffuse enlargement of the pancreas; delayed en- hancement of the enlarged pancreas and presence of a capsule-like rim on dynamic computed tomography; low apparent diffusion coefficient values on diffusion-weighted magnetic resonance image; irregular narrowing of the main pancreatic duct on endoscopic retrograde cholangiopancreatography; less upstream dilatation of the main pancreatic duct on magnetic resonance cholangiopancreatography, presence of other organ involvement such as bilateral salivary gland swelling, retroperitoneal fibrosis and hilar or intrahepatic sclerosing cholangitis; negative work-up for malignancy including endoscopic ultrasound-guided fine needle aspiration; and steroid responsiveness. Since AIP responds dramatically to steroid therapy, accurate diagnosis of AIP can avoid unnecessary laparotomy or pancreatic resection.展开更多
The ＂Pictorial＂ or ＂Iconic Turn＂ is a central issue in the contemporary theory of images and visual cultural studies. Should the theories concerning the ＂Iconic Turn＂ and formulated in the last 20 years by schol...The ＂Pictorial＂ or ＂Iconic Turn＂ is a central issue in the contemporary theory of images and visual cultural studies. Should the theories concerning the ＂Iconic Turn＂ and formulated in the last 20 years by scholars such as Gottfried Boehm, William Mitchell, Hans Belting be taken as critical theories of crisis？ Is the currently experienced ＂turn towards images＂ （and their progressive rehabilitation after a long standing philosophical and theological rejection） a sign and symptom of some crisis of people＇s relation with images, language and, generally speaking, with the representation forms of reality？ The main hypothesis of this essay envisages two sets of problems： first, the analysis of the relation between the possible idea of turning point and the concept of crisis; secondly, the thorough investigation of the relation connecting the iconic turn to the project of ＂critical iconology＂ or ＂critique of visual culture,＂ as outlined by Hans Belting and William Mitchell. From the interpretation of the ＂Iconic Turn＂ as situation of crisis and aesthetic, anthropological, and epistemological transformation follows the need for the sciences of image to provide a ＂critical iconology＂ in order to be able to theoretically reformulate the ideological and political presuppositions of some dominant contemporary forms of visual representation.展开更多
文摘To prevent a vehicle from departing the lane in assistant or automatic steering, real-time vision-based detection of lane is studied. The system architecture, detecting principle and lane model are described. Then the detecting algorithm of the lane image is discussed in detail. In this algorithm, several proper sub-windows in one image are first selected as the processing regions. To every sub-window, by means of such steps as appropriate pre-processing, edge detection and Hough transform, etc., the lane description features are extracted. Experimental results reveal that this detection method is of good real-time, high recognition reliability and strong robustness, etc., which can provide the decision-making foundation for the following automatic or assistant steering to some extent.
文摘目的:研究短梗五加果多酚(Acanthopanax sessiliflorus fruit polyphenols,ASFP)对大鼠动脉粥样硬化(atherosclerosis,As)的预防作用,并探讨其作用机制。方法:40只雄性SD大鼠随机平均分成4组,每组10只。采用高脂饮食结合腹腔注射VD3的方法建立As模型,不同剂量ASFP给药组自造模开始之日起分别灌胃150、75 mg/(kg·d)的ASFP,空白组和高脂饮食组大鼠灌胃等量生理盐水,各实验组连续处理12周后,检测大鼠血清生理生化水平并计算As指数;苏木素-伊红染色观察大鼠主动脉As病变情况;Western blot检测主动脉中黏附分子和丝裂原活化蛋白激酶(mitogen-activated protein kinase,MAPK)信号通路关键基因的蛋白表达水平。结果:与高脂饮食组相比,ASFP能显著降低大鼠血清中的血脂、黏附分子和炎症因子水平,减少主动脉中的脂质沉积,改善各层结构排列紊乱,显著降低主动脉中细胞间黏附分子-1、血管细胞黏附分子-1、磷酸化p38和磷酸化细胞外信号调节蛋白激酶1/2(phospho-extracellular signal regulated kinases 1/2,p-ERK1/2)的蛋白表达量。结论:ASFP具有预防As的作用,其作用可能与其降血脂和抑制p38 MAPK和ERK1/2 MAPK信号通路,进而抑制炎症因子的表达有关。
文摘Autoimmune pancreatitis (AIP) is a newly described entity of pancreatitis in which the pathogenesis appears to involve autoimmune mechanisms. Based on histological and immunohistochemical examinations of various organs of AIP patients, AIP appears to be a pancreatic lesion reflecting a systemic "IgG4-related sclerosing disease". Clinically, AIP patients and patients with pancreatic cancer share many features, such as preponderance of elderly males, frequent initial symptom of painless jaundice, development of new-onset diabetes mellitus, and elevated levels of serum tumor markers. It is of uppermost importance not to misdiagnose AIP as pancreatic cancer. Since there is currently no diagnostic serological marker for AIP, and approach to the pancreas for histological examination is generally difficult, AIP is diagnosed using a combination of clinical, serological, morphological, and histopathological features. Findings suggesting AIP rather than pancreatic cancer include:fluctuating obstructive jaundice; elevated serum IgG4 levels; diffuse enlargement of the pancreas; delayed en- hancement of the enlarged pancreas and presence of a capsule-like rim on dynamic computed tomography; low apparent diffusion coefficient values on diffusion-weighted magnetic resonance image; irregular narrowing of the main pancreatic duct on endoscopic retrograde cholangiopancreatography; less upstream dilatation of the main pancreatic duct on magnetic resonance cholangiopancreatography, presence of other organ involvement such as bilateral salivary gland swelling, retroperitoneal fibrosis and hilar or intrahepatic sclerosing cholangitis; negative work-up for malignancy including endoscopic ultrasound-guided fine needle aspiration; and steroid responsiveness. Since AIP responds dramatically to steroid therapy, accurate diagnosis of AIP can avoid unnecessary laparotomy or pancreatic resection.
文摘The ＂Pictorial＂ or ＂Iconic Turn＂ is a central issue in the contemporary theory of images and visual cultural studies. Should the theories concerning the ＂Iconic Turn＂ and formulated in the last 20 years by scholars such as Gottfried Boehm, William Mitchell, Hans Belting be taken as critical theories of crisis？ Is the currently experienced ＂turn towards images＂ （and their progressive rehabilitation after a long standing philosophical and theological rejection） a sign and symptom of some crisis of people＇s relation with images, language and, generally speaking, with the representation forms of reality？ The main hypothesis of this essay envisages two sets of problems： first, the analysis of the relation between the possible idea of turning point and the concept of crisis; secondly, the thorough investigation of the relation connecting the iconic turn to the project of ＂critical iconology＂ or ＂critique of visual culture,＂ as outlined by Hans Belting and William Mitchell. From the interpretation of the ＂Iconic Turn＂ as situation of crisis and aesthetic, anthropological, and epistemological transformation follows the need for the sciences of image to provide a ＂critical iconology＂ in order to be able to theoretically reformulate the ideological and political presuppositions of some dominant contemporary forms of visual representation.
