The Relationship between College Graduate’s Dual Self-Consciousness and Job Search Clarity: The Mediating Role of Perceived Stress

The aim of the study was to explore the relationship between college graduates’ dual self-consciousness, job search clarity and perceived stress, and reveal the mediating role of perceived stress between dual self-consciousness and job search clarity. In this study, 467 college graduates were investigated using the Dual Self-Consciousness Scale, Job Search Clarity Scale, and Perceived Stress Scale. After controlling for gender, age, and region, the results revealed that: (1) private self-consciousness has a significant positive predictive effect on job search clarity; (2) perceived stress has a significant negative predictive effect on job search clarity; (3) perceived stress plays partial mediation effects between private self-consciousness and job search clarity; (4) perceived stress plays complete mediation effects between public self-consciousness and job search clarity; (5) perceived stress has suppressing effects between public self-consciousness and job search clarity.     

Robust rigid registration of retinal angiograms through optimization

Retinal fundus photographs are employed as standard diagnostic tools in ophthalmology. Serial photographs of the flow of fluorescein and indocyanine green (ICG) dye are used to determine the areas of the retinal lesions. For objective measurements of features, the registration of the images is a necessity. In this paper, we employ optimization techniques for registration with the help of 2-parameter translational motion model of retinal angiograms, based on non-linear pre-processing (Wiener filtering and morphological gradient) and computation of the similarity criteria for the alignment of the two gradient images for any given rigid transformation. The optimization methods are effectively employed to minimize the similarity criterion.

The presence of noise, the variations in the background and the temporal variation of the fluorescence level pose serious problems in obtaining a robust registration of the retinal images. Moreover, local search strategies are not robust in the case of ICG angiograms, even if one uses a multiresolution approach.

The present work makes a systematic comparison of different optimization techniques, namely the minimization method derived from the optical flow formulation, the Nelder-Mead local search and the HCIAC ant colony metaheuristic, each optimizing a similarity criterion for the gradient images. The impact of the resolution and median filtering of gradient image is studied and the robustness of the approaches is tested through experimental studies, performed on macular fluorescein and ICG angiographies.

Our proposed optimization techniques have shown interesting results especially for high resolution difficult registration problems. Moreover, this approach seems promising for affine (6-parameter motion model) or elastical registrations.     

Global bifurcation structure of chaotic neural networks and its application to traveling salesman problems

This paper studies global bifurcation structure of the chaotic neural networks applied to solve the traveling salesman problem (TSP). The bifurcation analysis clarifies the dynamical basis of the chaotic neuro-dynamics which itinerates a variety of network states associated with possible solutions of TSP and efficiently ‘searches’ for the optimum or near-optimum solutions. By following the detailed merging process of chaotic attractors via crises, we find that the crisis-induced intermittent switches among the ruins of the previous localized chaotic attractors underly the ‘chaotic search’ for TSP solutions. On the basis of the present study, efficiency of the ‘chaotic search’ to optimization problems is discussed and a guideline is provided for tuning the bifurcation parameter value which gives rise to efficient ‘chaotic search’.     

Search for coloured objects in natural surroundings by people with abnormal colour vision

Background: People with abnormal colour vision often report difficulty seeing coloured berries and flowers in foliage, which suggests they will have a diminished capacity for visual search when target objects are marked out by colour. There is very little experimental evidence of the effect of abnormal colour vision on visual search and none relating to search for objects in natural foliage. Method: We showed 79 subjects with abnormal colour vision (seven protanopes, 10 deuteranopes, 16 protanomals and 46 deuteranomals) and 20 subjects with normal colour vision photographs of natural scenes and asked them to locate clumps of red berries, to trace the length of a red string on grass and to name the season depicted in a photograph taken in the Autumn and the same scene photographed in the Summer. Colour vision was assessed using the Ishihara, the Medmont C100, the Farnsworth D15, the Richmond HRR and the Nagel anomaloscope. Results: All the subjects with abnormal colour vision located fewer clumps of red berries than those with normal colour vision. The subjects who failed the Farnsworth D15 performed significantly worse than those who passed but the distribution of scores in the two groups overlaps. The majority of subjects with abnormal colour vision could not trace the full length of the string: only 38 per cent of anomalous trichromats who passed the Farnsworth D15 test and three per cent of those who failed it were able to trace the full length of the string. Fifty‐five per cent of those classed as having a mild deficiency by the HRR test could trace the whole string. Most dichromats were unable to identify the Autumn season and those who did may have been assisted by guessing. Most (94 per cent) of those who passed the Farnsworth D15 test and all those classified as having a ‘mild’ deficiency by the HRR test could identify the season. Conclusions: All people with abnormal colour vision, even those with a very mild deficiency, have some degree of impairment of their ability to see coloured objects in natural surroundings. A pass at the Farnsworth D15 test or a ‘mild’ classification with the Richmond HRR test identifies those likely to have the least problems with visual search and identification tasks. The results have practical implications for the selection of personnel in occupations that involve visual search in natural terrain.     

Immunoglobulin mimicry by Hepatitis C Virus envelope protein E2

Hepatitis C virus (HCV) establishes persistent infection in the majority of infected individuals. The currently accepted hypothesis of immune evasion by antigenic variation in hypervariable region 1 (HVR1) of glycoprotein E2 does not however, explain the lack of subsequent immune recognition. Here, we show that the N-terminal region of E2 is antigenically and structurally similar to human immunoglobulin (Ig) variable domains. E2 is recognized by anti-human IgG antibodies and also possesses common amino acid (aa) sequence features of the conserved v-gene framework regions of human Ig light chains in particular but also heavy chains and T cell receptors. Using a position specific scoring system, the degree of similarity of HVR1 to Ig types correlated with immune escape and persistence in humans and experimentally infected chimpanzees. We propose a unique role for threshold levels of Ig molecular mimicry in HCV biology that not only advances our concept of viral immune escape and persistent infection but also provides insight into host-dependent disease patterns.     

Attention to Color: An Analysis of Selection, Controlled Search, and Motor Activation, Using Event-Related Potentials

In this study the organization of information processing in a selective search task was examined by analyzing event-related potentials. This task consisted of searching for target letters in a relevant (attended) color. The ERPs revealed two different effects of attention: an early occipital negativity (+/- 150 ms) reflecting feature-specific attention, and a later, central N2b component (+/- 240 ms) reflecting covert orienting of attention. A later, prolonged negativity (search-related negativity) (+/- 300 ms), maximal at Cz, was related to controlled search to letters in the attended color. Detection of relevant targets resulted in a parietal P3b component. Depending on stimulus presentation conditions an earlier response to both attended and unattended targets was found: an N2 component (+/- 250 ms). In these same conditions, C'3-C'4 asymmetries (Corrected Motor Asymmetries--CMA) suggested motor activation at +/- 300 ms, in the same time range as search-related negativity. It was argued that N2 and CMA suggest the existence of a preattentive target detection system, operating in parallel with a slower serial attentive system, as reflected by N2b and search negativity.     

二维视觉搜索的计算机模拟

视觉搜索的模拟算法考虑两个交互作用的过程:覆盖过程(“看”)和视觉过程(“看见”)。搜索场景包含有靶,假目标和背景噪声;一个视力角模型按一定的搜索策略去覆盖场景。对模拟程序的输入是场景和靶的空间大小,随机分布的靶和假目标的数目。靶探测几率和识别几率均为物体在场景中对比度和物体离视力角中心的距离的函数。本模拟程序的目的是比较系统搜索和随机搜索的性能,验证关于计算最佳视窗宽度的公式,进而鉴别影响靶探测和识别能力的覆盖过程和视觉过程的参数,阐明它们之间的相互作用。     

大学生就业效能量表的编制

目的编制适用于我国大学生的就业的效能量表。方法在深入访谈和文献综述的基础上，编制出大学生就业效能量表，运用探索性和验证性因素分析技术对568名全日制在校本科生的就业效能的内在结构进行了探讨。结果大学生就业效能主要有3个因素组成：个性自我了解、就业信息与技能和就业应对信心，问卷的各项测量指标良好。结论本问卷可以作为测量大学生就业效能的工具。     

新型冠状病毒肺炎的流行及公众关注度研究

目的 通过对北京市2020年6月11日—7月20日新型冠状病毒肺炎(简称新冠肺炎)疫情流行情况及网络关注点进行分析,为疫情防控提供参考。 方法 利用北京市卫生健康委员会官方网站新冠肺炎疫情通报和互联网搜索引擎,回顾性搜集整理疫情数据和网络搜索指数数据,并采用描述性统计和Spearman秩相关分析方法进行数据分析。 结果 6月11日—7月20日北京市新冠肺炎累计确诊335例,累计发病率为1.56/10万;累计确诊病例主要集中在丰台区(230例,占68.66%)。网络搜索指数研究显示,“北京疫情最新情况”和“新发地”搜索指数均与疫情数据存在相关关系(r=0.711,P＜0.05;r=0.861,P＜0.05); “北京疫情”搜索指数最高,并与日新增确诊病例数呈高度正相关(r=0.919,P＜0.05)。 结论 北京市新型冠状病毒肺炎疫情已取得阶段性成效。网络搜索指数与疫情发展高度相关,应加强网络搜索指数在疫情防控中的应用。     

水飞蓟宾构象的理论研究

目的 水飞蓟宾RRRR对映体分子中存在多个可变的二面角，可以产生许多立体构象，旨在从理论上寻找其合理构象。方法 采用二面角系统搜索后，结合AM1方法确定主要构象，以B3LYP／6—31G*方法优化构型后，在B3LYP／3—21G水平计算了振动频率和热力学参数。结果 得到了各二面角的分布情况，找出了主要的局部构象，明确了C9-C11和C18-C22旋转主要引起分子构象变化，4种主要构象能量差异较小，都有存在的可能性，二面角C19-C18-C22-C32和C8-C9-C11-C16变化的能量曲线表明，C9-C11旋转的能垒很小，受C19的羟甲基影响，C18-C22旋转能垒较大。结论 水飞蓟宾RRRR对映体主要以4种构象的形式存在。