Tactical crew planning in railways

Tactical crew capacity planning problem in railways involves finding the minimum number of crews in a region required to operate a predetermined set of train duties satisfying the strict day-off requirement for crew. For the single-region problem, we develop two solution approaches based on a space–time network representation: the sequential approach and the integrated approach. We also study the multi-regional capacity planning problem where we minimize total system-wide capacity by simultaneously considering multiple regions within a neighborhood search algorithm based on our solution methods for the single-region problem. We present the computational study on problem instances from Turkish State Railways.     

江苏民俗类农业文化遗产的现状调查与保护对策研究

江苏民俗类农业遗产资源丰富,主要集中在生产民俗、生活民俗与民间观念。从整体特色上看,江苏民俗类农业遗产具有丰厚的地域历史内涵与地域文化特色,它是非物质文化遗产的富矿,反映了江苏和全国其他地区的文化关联性,是江苏文化具有多重文化交汇、多元共生的重要见证。从保护对策上,应该在尊重与了解的基础上,重视江苏民俗类农业遗产的全面传承与发展;重视文化重构,强化其文化内生力;文化产业介入与公共文化建设双管齐下,做好保护与开发的双重工作。     

Effectiveness of the reserve option mechanism as a macroeconomic prudential tool: evidence from Turkey

This article assesses the effectiveness of a novel macroprudential tool – the reserve option mechanism (ROM) – which Turkey’s central bank developed during the post-2008 period and has employed to control the risk associated with excessive capital flows. We assess how capital flows have affected economic variable changes since the introduction and usage of the ROM. Empirical evidence gathered from Turkey suggests that the tool decreases the effect of capital flow on capital flow (positive shock to capital flow dies out faster or becomes less persistent) and diminishes the effects of capital flow shocks on exchange and interest rates.     

氨水共沉淀法制备纳米活性NiO的研究

简述了以Ni(NO3 ) 2 ·6H2 O为原料、氨水为沉淀剂 ,通过共沉淀法得到前驱物再经后处理制备出了纳米活性NiO的方法。该法简化了操作程序、降低了加工成本 ,且原料价廉易得 ,便于实现工业化生产     

Global Crisis,National Responses: The Political Economy of Turkish Exceptionalism

With its dilatory and piecemeal fiscal activism and uncharacteristic aversion to IMF assistance, the Turkish government's response to the global economic crisis of 2008–9 diverged considerably from prevalent trends in other major emerging market countries. Underlying this intriguing pattern were Turkey's pre-existing policy and macroeconomic constraints, cognitive lapses on the part of policymakers, and the conjunctural dynamics of domestic politics. The interplay of these factors progressively narrowed the policy space for vigorous action, leading to a motley combination of reactive initiatives that neither offered sufficient protection to vulnerable social groups nor promised sustainable growth in the long run despite rapid short-term recovery.     

Informativeness of experiments for meu

The celebrated Blackwell’s theorem demonstrates the equivalence of a notion of statistical informativeness and economic valuableness for the class of preferences that are represented by the subjective expected utility. This note shows that this equivalence holds for a larger class of preferences, namely maxmin$maxmin$ expected utility.     

When does low interconnectivity cause systemic risk?

We analysed a systemic liquidity crisis by using a unique money market data-set in which the coded identity of the counterparties of each trade is known. Contrary to recent findings, we did not observe a positive relationship between interconnectivity and systemic risk. We have concluded that our conflicting findings can be related to the degree of market concentration on the borrowing side of the funding market. High level of concentration in the borrowing side led to lower interconnectivity but higher systemic risk prior to the crisis. We conclude that measures of market heterogeneity should be used to generalize the relationship between systemic risk and interconnectivity.     

Effects of US interest rates and news on the daily interest rates of a highly indebted emerging economy: evidence from Turkey

It has been widely demonstrated that asset prices react sensitively to macroeconomic news releases both in the industrialized countries and emerging markets. However, there are contradicting results on the effects of changes in interest rates of industrialized countries on asset prices of emerging markets. In heavily indebted economies, in addition to these factors, political news and announcements from international institutions that may increase or decrease concerns about debt sustainability can affect asset prices as well. This potential notwithstanding, there has been relatively limited empirical work on the effects of such variables. The objective of this study is to quantify the impact of all of these factors on interest rates of a highly indebted emerging economy. Using daily post-crisis data of the Turkish economy we show that both good and bad political news, International Monetary Fund announcements, and European Union related news significantly affected secondary market government securities yields, whereas volatility of yields was affected mainly by bad news releases. Changes in US Treasury bond rates and ‘appetite’ for risk of foreign investors did not affect government securities yields in the period analysed.     

Stochastic optimization applied to self-financing portfolio: does bequest matter?

The article studies stochastic optimization of an intertemporal consumption model to allocate financial assets between risky and risk-free assets. We use a stochastic optimization technique, in which utility is maximized subject to a self-financing portfolio constraint. The papers in literature have estimated the errors of Euler equations using data from financial markets. It has been shown that it is sufficient to test the first order Euler equation implied by the model. However, they all assume a constant consumption–wealth ratio that constrains the boundary conditions, hence influencing the coefficient of the risk premium. The main contribution of our article is that we drop the assumption of a constant consumption–wealth ratio. We have an analytical solution using a utility maximization model with a stochastic self-financing portfolio. We introduce a terminal condition of wealth with and without bequests. We also simulate the stochastic optimization with a self-financing portfolio, distinguishing risk neutral investors (γ-low) from high risk averse investors (γ-high). We show that the model with bequest has a higher level of wealth and a smoother decline of consumption over time than the model with no bequest at the end of the period. The model with no bequest has the same level of consumption and a sharp fall at the end of the period. Risk averse agents with high return assets have a higher amount of wealth than risk-neutral agents with lower return assets.     

Career advancement in large organizations in Europe and the United States: do international assignments add value?

We look at the relationship between the number of assignments, the length of international assignment experience, the type of employer commissioning the international assignment, the individual's career stage at the first assignment, and career advancement: the time that the executives took to be appointed to the CEO position from the start of their career. Our sample of 1001 chief executives, based in 23 countries and affiliated with the 500 largest corporations in Europe and the 500 largest in the United States, allows us to examine important individual- and organization-level contingencies that affect the relationship between international assignment experience and career advancement. We find that international experience slows the executives' ascent to the top, longer assignments and a larger number of assignments being detrimental to their speed of ascent to top corporate positions. Further, international assignments at corporations other than the CEOs' current employer and assignments taken at later stages of executives' careers damage career advancement.