基于YouTube的视频源鉴别

在一定条件下,传感器的光电响应非均匀(PRNU)特性能够作为拍摄器材的特异性指标,用于视频图像的来源鉴别.本文利用Luká(s)等[1]定义的小波滤波器提取经过AVC方式重新编码的视频文件中的光电响应非均匀特性模式,研究调节分辨率和编码参数对拍摄器材的光电响应非均匀性模式的影响,发现部分经过重新编码的视频仍能够通过光电响应非均匀特性进行拍摄器材的鉴别.     

Rural development through the construction of new,nested, markets: comparative perspectives from China,Brazil and the European Union

This article discusses and compares the rural development processes and practices currently occurring in China, Brazil and the European Union. Although these are strongly rooted in the specificities of time and space, they also share important commonalities. We argue that rural development can be viewed as an evolving set of responses to market failures. A key element of these responses is that they are unfolding through the construction of new markets: a seemingly contradictory phenomenon that has, as yet, hardly been scrutinized or theoretically elaborated. We describe these newly emerging markets as ‘nested markets’ and support our argument with a careful reconsideration of the dynamics of long-established nested markets. We then extend this analysis, firstly, by arguing that the construction of such new markets occurs through a process of social struggle and, secondly, by exploring the strength of these newly emerging constellations in relation to the hegemony exerted by food empires. Our analysis puts common-pool resources, which underlie these new, nested markets, centre stage.     

西方霸权的竞争者:过去与现在——作为一种全球治理视角

近年来，人们常常听到对于中国何时能超过美国成为世界头号经济体的各种预测。高盛首席经济学家吉姆·奥尼尔在最近的一次评估中认为，就目前的增长率而言，中国将在2027年超过美国。就在同一年，金砖四国GDP总和将超过目前的七国集团。     

Heroin impurity profiling. A harmonization study for retrospective comparisons

Three laboratories present a harmonised system for the retrospective comparison of south west Asian heroin. It consists of an improved gas chromatographic (GC) profiling method and a computerised data retrieval. The investigations of the GC were necessary with a view to improve the reproducibility of the system. The necessity of a strict quality control is emphasized. The peaks of the GC profile were investigated for abundance, intensity, GC behaviour (reproducibility) and correlations; 16 of them were selected for describing the heroin profile in the database. The results from intra-lab profile comparisons are reported. The reproducibility of the analysis was good and the variation between the samples was large, thus, allowing conclusions with a high degree of certainty. The criteria of similarity were defined. The system is successfully running in all three labs.In connection with inter-laboratory comparison, the aspects of method harmonisation and standardisation are discussed. It appeared that the GC method is a very subtile one, urging for a strict standardisation between the three labs. Despite a long cooperation between three well-equipped and experienced labs, a more or less serious loss of reproducibility was noticed in the inter-lab results in comparison with the intra-lab results. The loss could for the greater part be attributed to the (limits of the) GC technique; a number of compounds, necessary for making the discrimination between samples, showed difficult chromatographic behaviour, leading to insufficient inter-lab reproducibility. Using the actual variables, improvements in performance can hardly be expected in the near future. The loss of reproducibilty implies that the number of false positive matches in a database search increases. This may strongly reduce the value of a relatively large, international database. The study shows that so far, the best option for international comparison is the analysis in a central laboratory. The idea of local determination at a large number of national labs and the use of a common database is not a realistic aim for this type of analysis.     

Business 2.0: Kyrgyz middlemen in Guangzhou

ABSTRACT

Among the many ‘businesspeople’ whom the promise of commercial success has drawn to southern China in recent years one can find a small number of Kyrgyz middlemen. Working mostly with Russian-speaking clients, their job is to organize buying trips, coordinate with local manufacturers, translate, and oversee cargo shipments. Based on ethnographic fieldwork since 2013, this article examines in detail the careers, work routines and business model adopted by Kyrgyz middlemen in Guangzhou. I argue that in contrast to the early bazaar or shuttle traders, who have been operating across Eurasia since the 1990s, these Kyrgyz middlemen constitute a next kind of economic actor within more diversified, service-oriented and formalized value chains across post-Socialist Eurasia (referred to here as Business 2.0). One of these middlemen’s most salient contributions is to translate between the informal and formal domains of national economies as well as within cross-border economic transactions.     

Sharing benefits of globalisation through an EU-ASEAN FTA?

In the aftermath of the stalled launch of a new WTO round in Seattle in 1999, Singapore and Japan initiated a joint study into a possible bilateral Free Trade Agreement (FTA). The resulting New-Age Economic Partnership Agreement was signed in 2002, reduced barriers in trade and investment in goods as well as services, technical standards and public procurement. Other FTAs followed including a US-Singapore FTA in 2003. In response, other ASEAN countries initiated negotiations towards bilateral FTAs, such as Thailand with India and Malaysia with Japan etc. Moreover, China declared its intention to enter into a FTA with the ASEAN by 2012. The failure at Cancun in 2003 implies that the Doha Development Agenda will not be achieved within the time-frame set. In this environment, the question of a feasibility of an inter-regional EU-ASEAN FTA is investigated. ASEANs trade policy regime is opening up and the gains of further tariff elimination will be modest, because most ASEAN countries already apply low tariffs, while those of the EU on import from ASEAN are low as well – e.g. for Singapore the tariff rate is merely 1.04 per cent (trade weighted). Nevertheless, a further reduction will benefit both EU and ASEAN because a significant share of imports is intra-firm trade, with EU firms operating from ASEAN as a production platform for the EU markets. However, for an EU-ASEAN FTA to be worthwhile, it must generate benefits on issues relating to non-tariff barriers to trade, esp. technical standards, SPS and mutual recognition of testing. Further significant benefits to EU and ASEAN may be realised by advancing liberalisation of international trade in services (e.g. banking and insurance licences, air and sea transport). Reducing restrictions on foreign direct investment in selectedservice sectors is bound to enhance investment flows from the EU to ASEAN.This article draws extensively on a study directed by the author with Dr. Paul Brenton, Prof. Ludo Cuyvers and Prof. Patrick Messerlin (van der Geest et al. 2003). Research assistance by Ms. Vanessa Sumo and Ms. Roberta Zavoretti is gratefully acknowledged. The views expressed in this article are solely those of the author and do not reflect the views of the European Institute for Asian Studies or of its sponsors. The author is solely responsible for any remaining errors or inaccuracies. All comments are welcomed at w.vandergeest@eias.org     

Electoral participation in the Netherlands: Individual and contextual influences

Abstract Research into electoral participation has produced two traditions, one focusing mainly on individual level explanations while the second concentrates primarily on aggregate level explanations. By bringing these two research approaches together, we are not only able to explain individual electoral participation more thoroughly, but we also gain additional insight into the influence of aggregate level characteristics on individual behavior. We combine eight National Election Studies held in the Netherlands between 1971 and 1994 enabling us to study variation on the individual and the contextual (aggregate) level, including interactions between these two levels. Findings show that the addition of contextual characteristics form a significant improvement to an individual level model predicting electoral participation. Findings also confirm our expectation that the influence of individual characteristics such as education or political interest is dependent upon contextual characteristics describing for instance the salience of the election.