Estimation of the Hurst and the stability indices of a HH-self-similar stable process

In this paper we estimate both the Hurst and the stable indices of a H-self-similar stable process. More precisely, let $X$ be a $H$-sssi (self-similar stationary increments) symmetric $\alpha$-stable process. The process $X$ is observed at points $\frac{k}{n}$, $k=0,\ldots,n$. Our estimate is based on $\beta$-variations with $-\frac{1}{2}<\beta<0$. We obtain consistent estimators, with rate of convergence, for several classical $H$-sssi $\alpha$-stable processes (fractional Brownian motion, well-balanced linear fractional stable motion, Takenaka's processes, L\'evy motion). Moreover, we obtain asymptotic normality of our estimators for fractional Brownian motion and L\'evy motion. Keywords: H-sssi processes; stable processes; self-similarity parameter estimator; stability parameter estimator

From "land to the tiller" to the "new landlords"? The debate over Vietnam's latest land reforms

Between Vietnam’s independence and its reunification in 1975, the country’s socialist land tenure system was underpinned by the principle of “land to the tiller”. During this period, government redistributed land to farmers that was previously owned by landlords. The government’s “egalitarian” approach to land access was central to the mass support that it needed during the Indochinese war. Even when the 1993 Land Law transitioned agricultural land from collectivized to household holdings with 20-year land use certificates, the “land to the tiller” principle remained largely sacrosanct in state policy. Planned amendments to the current Land Law (issued in 2013), however, propose a fundamental shift from “land to the tiller” to the concentration of land by larger farming concerns, including private sector investors. This is explained as being necessary for the modernization of agricultural production. The government’s policy narrative concerning this change emphasizes the need to overcome the low productivity that arises from land fragmentation, the prevalence of unskilled labor and resource shortages among smallholders. This is contrasted with the readily available resources and capacity of the private sector, together with opportunities for improved market access and high-tech production systems, if holdings were consolidated by companies. This major proposed transition in land governance has catalyzed heated debate over the potential risks and benefits. Many perceive it as a shift from a “pro-poor” to “pro-rich” policy, or from “land to the tiller” to the establishment of a “new landlord”—with all the historical connotations that this badge invokes. Indeed, the growing level of public concern over land concentration raises potential implications for state legitimacy. This paper examines key narratives on the government-supported land concentration policy, to understand how the risks, benefits and legitimacy of the policy change are understood by different stakeholders. The paper considers how the transition could change land access and governance in Vietnam, based on early experience with the approach.This research was partially supported the Australian Research Council’s Discovery Projects funding scheme (project DP180101495)

A STUDY ON THE DIFFICULTIES IN WRITING ARGUMENTATIVE ESSAYS OF ENGLISH-MAJORED SOPHOMORES AT TAY DO UNIVERSITY, VIETNAM

The research entitled “A study on the difficulties in writing argumentative essays of English-majored sophomores at Tay Do University” was conducted with the purpose of pointing out some common difficulties of sophomores in writing argumentative essays. The participants of this study were 90 English-majored sophomores of course 13, and two teachers who teach English language at Tay Do University. In this study process, questionnaire and interview were used as two instruments to collect the data. The results of the research would show that English majored sophomores met difficulties in term of linguistic competence (vocabulary, grammar and coherence), organization and development of an argumentative essay, and the lack of critical thinking. Article visualizations

The problem of longitudinal shock of two spherical end elastic bars with visco-elastic resistance force

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Optimization of Main Factors Affecting Construction Waste by the Supply Chain Management

A survey report of the Vietnam Urban Environment and Industrial Zone Association reveals that every day in 2009, about 1,000 tons of construction waste were generated in Hanoi and 2,000 tons Ho Chi Minh City in Vietnam. It is forecasted that the coming years would see a vigorously growing amount of construction waste as a result of the plan to dismantle and renovate old apartment buildings in major cities. So, in this research we developed a supply chain management strategy for the waste controlling in the construction industry. While the bulky volume of construction wastes poses a great environmental threat to urban areas, response to it remains meager. Hence, this paper presents four primary factors affecting the management of construction wastes in Vietnam using fuzzy logic