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

A two-dimensional backward heat problem with statistical discrete data

Abstract We focus on the nonhomogeneous backward heat problem of finding the initial temperature θ = θ ⁢ ( x , y ) = u ⁢ ( x , y , 0 ) {\theta=\theta(x,y)=u(x,y,0)} such that { u t - a ⁢ ( t ) ⁢ ( u x ⁢ x + u y ⁢ y ) = f ⁢ ( x , y , t ) , ( x , y , t ) ∈ Ω × ( 0 , T ) , u ⁢ ( x , y , t ) = 0 , ( x , y ) ∈ ∂ ⁡ Ω × ( 0 , T ) , u ⁢ ( x , y , T ) = h ⁢ ( x , y ) , ( x , y ) ∈ Ω ¯ , \left\{\begin{aligned} \displaystyle u_{t}-a(t)(u_{xx}+u_{yy})&amp;\displaystyle=f% (x,y,t),&amp;\hskip 10.0pt(x,y,t)&amp;\displaystyle\in\Omega\times(0,T),\\ \displaystyle u(x,y,t)&amp;\displaystyle=0,&amp;\hskip 10.0pt(x,y)&amp;\displaystyle\in% \partial\Omega\times(0,T),\\ \displaystyle u(x,y,T)&amp;\displaystyle=h(x,y),&amp;\hskip 10.0pt(x,y)&amp;\displaystyle% \in\overline{\Omega},\end{aligned}\right.\vspace*{-0.5mm} where Ω = ( 0 , π ) × ( 0 , π ) {\Omega=(0,\pi)\times(0,\pi)} . In the problem, the source f = f ⁢ ( x , y , t ) {f=f(x,y,t)} and the final data h = h ⁢ ( x , y ) {h=h(x,y)} are determined through random noise data g i ⁢ j ⁢ ( t ) {g_{ij}(t)} and d i ⁢ j {d_{ij}} satisfying the regression models <jats:disp-formula id="j_jiip-2016-0038_eq_999

InP Heterojunction Bipolar Transistor Amplifiers to 255 GHz

Two single-stage InP heterojunction bipolar transistor (HBT) amplifiers operate at 184 and 255 GHz, using Northrop Grumman Corporation s InP HBT MMIC (monolithic microwave integrated circuit) technology. At the time of this reporting, these are reported to be the highest HBT amplifiers ever created. The purpose of the amplifier design is to evaluate the technology capability for high-frequency designs and verify the model for future development work

Bringing Xoan Singing into Music Teaching for Primary School Students in the Northern Central Region

Xoan singing is a cultural heritage of the type of folk performance associated with worshiping Hung Kings in the Ancestral Land of Phu Tho, a belief originating from the ancestor worshiping practices of the Vietnamese people. Xoan singing is recognized by UNESCO as an intangible cultural heritage of humanity. Xoan singing education for students right from elementary school age is considered an effective way to preserve and promote the value of this traditional cultural heritage. Currently, many high schools in some Provinces such as Phu Tho and Vinh Phuc in Vietnam have introduced Xoan singing into teaching for high school students, but it is still not worthy of the value and influence of Xoan singing in social life. Therefore, there needs to be solutions. specific law. The research team of the Central University of Arts Pedagogy has carried out the project "Introducing Xoan Singing into Primary School Music in the Northern central Region", specifically in the two provinces of Phu Tho and Vinh Phuc

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