杜甫《登高》诗中的乐观主义精神探微

杜甫写于唐大历二年(767年)秋天的《登高》诗,虽是其晚年凄凉与孤独生活状态的真实写照,但诗中却充满着令人激动的气势.这种气势不仅源于杜甫对登高文学传统的继承,亦是其晚年面对迁逝之感时昂扬生命意识的展现.除了感时伤事,诗中还深刻蕴含着杜甫晚年的壮阔情怀以及乐观主义精神,这种精神与夔州相对安定的生活有着密切关联,更是其儒家思想的重要体现.     

黑格尔《逻辑学》中的"坏无限"与"真无限"

"无限"概念在黑格尔的哲学中,乃至在整个德国观念论思想中都处于至关重要的地位,深入理解无限的意义内涵、显现形态和达到方式,对理解黑格尔哲学的结构、动力和目的来说非常关键.在作为科学之形式的《逻辑学》中,无限及其两个核心形态——坏的无限与真的无限——最早在实有的部分得到了专题的讨论.依据对这部分文本的解读,梳理和总结两种无限的结构特点,并揭示其背后理性的运作机制.     

A quadratic time exact algorithm for continuous connected 2-facility location problem in trees

This paper studies the continuous connected 2-facility location problem (CC2FLP) in trees. Let \(T = (V, E, c, d, \ell , \mu )\) be an undirected rooted tree, where each node \(v \in V\) has a weight \(d(v) \ge 0\) denoting the demand amount of v as well as a weight \(\ell (v) \ge 0\) denoting the cost of opening a facility at v, and each edge \(e \in E\) has a weight \(c(e) \ge 0\) denoting the cost on e and is associated with a function \(\mu (e,t) \ge 0\) denoting the cost of opening a facility at a point x(e, t) on e where t is a continuous variable on e. Given a subset \(\mathcal {D} \subseteq V\) of clients, and a subset \(\mathcal {F} \subseteq \mathcal {P}(T)\) of continuum points admitting facilities where \(\mathcal {P}(T)\) is the set of all the points on edges of T, when two facilities are installed at a pair of continuum points \(x_1\) and \(x_2\) in \(\mathcal {F}\), the total cost involved in CC2FLP includes three parts: the cost of opening two facilities at \(x_1\) and \(x_2\), K times the cost of connecting \(x_1\) and \(x_2\), and the cost of all the clients in \(\mathcal {D}\) connecting to some facility. The objective is to open two facilities at a pair of continuum points in \(\mathcal {F}\) to minimize the total cost, for a given input parameter \(K \ge 1\). This paper focuses on the case of \(\mathcal {D} = V\) and \(\mathcal {F} = \mathcal {P}(T)\). We first study the discrete version of CC2FLP, named the discrete connected 2-facility location problem (DC2FLP), where two facilities are restricted to the nodes of T, and devise a quadratic time edge-splitting algorithm for DC2FLP. Furthermore, we prove that CC2FLP is almost equivalent to DC2FLP in trees, and develop a quadratic time exact algorithm based on the edge-splitting algorithm. Finally, we adapt our algorithms to the general case of \(\mathcal {D} \subseteq V\) and \(\mathcal {F} \subseteq \mathcal {P}(T)\).     

基于数量柔性契约的双源应急物资采购定价模型

针对灾害事件发生的不确定性以及灾害发生后应急物资需求量的爆发式增长，本文设计了一个政府主导的基于数量柔性契约的双源应急物资采购模型。在存在一个现货市场的情况下，政府除了常规采购外，还会与供应方签订一份数量柔性契约，用以建立政企联合储备应急物资的合作关系。通过数理推导，本文发现灾害事件发生概率，政府自身储备量，现货市场采购价格会对双方决策产生重要影响，并给出三个影响因素在满足不同条件时政企双方的最优决策，同时进一步分析了这三个因素对政府采购成本与供应方利润的影响。最后，通过数值模拟的方式对所得结论进行了验证。本文的研究为政府与企业构建联合储备应急物资的合作关系提供了指导与依据。     

“亲亲相隐”或“大义灭亲”:人伦秩序与公共秩序的关系研究

"亲亲相隐"与"大义灭亲"这一对矛盾的背后，隐藏的命题是人伦秩序与公共秩序的关系，两者既有一致的一面，也有冲突的一面。笔者的研究成果主要有：第一，通过理论研究发现，"亲亲相隐"与"大义灭亲"的立法在理论上都有其合理性；第二，通过实证研究发现，受对家庭成员的信任度、法律素质和对意识形态的认同度的影响，在现实社会生活中公民的告亲行为呈现出"亲亲相隐"与"大义灭亲"并存的状态；第三，基于理论与实证研究，并借鉴古今中外的相关立法，笔者认为在两种秩序发生冲突时，一般情况下应当维护人伦秩序，因为这是人最基本的价值需求，法律不能置之不顾，而在特殊情况下，如涉及恶性犯罪，则必须强调公共秩序维护的优先性。     

“游戏成瘾”与健康性应对——兼论健康传播在游戏中的适应性

《国际疾病分类》正式将"游戏成瘾"收录其中，在强调成瘾危害的同时，也认可其作为社会问题医学化的某种待研究领域。实际上，"游戏成瘾"已经构成了现代意义上的"疾病"认知，在与健康传播的缠绕之中既形成了独特的研究范式，也面临着自身困境。立足于此，应从游戏量级、游戏内容、游戏情境及游戏关联等方面进行相关的健康应对，并在健康支出、文本、体验及情感等传播变量中予以规制及改善。同时，以游戏"情商加油站"为个案，探讨健康传播作为一种研究视角，在游戏适应中的严肃化转向及可行性。     

Defender–Attacker Games with Asymmetric Player Utilities

The presence of strategic attackers has become an important factor in the security and protection of systems, especially since the 9/11/2001 attacks, and considerable efforts have been dedicated to its study. When defending against the strategic attacker, many existing studies assume that the attacker would seek to minimize the defender's utility, which implies that the defender and attacker have symmetric utilities. However, the attacker's objective is determined by its own valuation of the system and target of the attack, which is not necessarily consistent with the defender's utility. If the attacker unexpectedly targets a different utility, then the defense strategy might no longer be optimal. In particular, the defense strategy could be inferior if the attacker's utility is not known to the defender. This study considers a situation where the defender's utility is the system survivability and the attacker's utility is the expected number of destroyed elements in the system. We investigate possible attack strategies under these two different utilities and compare (a) the conservative defense strategy when the attack utility is unknown to the defender with (b) the optimal defense strategy when the attack utility is known to the defender. We show that the conservative protection strategy is still optimal under asymmetric utilities when the contest intensity is smaller than one.     

“一带一路”视阈下巴基斯坦向海湾地区劳务输出的影响与趋势

海湾地区是巴基斯坦最重要的海外劳务输出目的地,这是由特殊的地缘因素与经济互补性所决定的。海湾劳工给巴基斯坦经济社会提供了发展助力,也折射出巴经济社会存在的结构性问题。“一带一路”建设的推进,尤其是“中巴经济走廊”的实施为巴基斯坦提供了造血能力,将有助于巴基斯坦经济成功转型,增加就业机会,提高自身吸纳劳动力的能力,减少向海湾的劳务输出。     

陆梁油田薄层底水油藏水平井井筒模拟研究

新疆陆梁油田呼图壁河组油藏发育一类特殊的薄层底水型油藏，其特点是油层厚度薄，构造幅度低，底水能量大，利用水平井开采，表现出无水采油期短、含水率上升速度快、产量递减大的特点。针对这些问题，采用水平井数值模拟方法，建立了考虑摩擦压力损失的水平井井筒模型，明确了摩擦压力损失对水平井的压力分布以及水平段产量的影响，在此基础上，分析研究了水平井底水锥进的水脊特征，判断了水平井出水位置，提出了封堵出水井段并结合油藏工程方法确定了水平井合理产液量，从而达到抑制底水快速锥进，减小压力损失，降低含水率上升速度的目的。