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Geographic Object-Based Image Analysis of Changes in Land Cover in the Coastal Zones of the Red River Delta (Vietnam)  [PDF]
Simona Niculescu, Chi Nguyen Lam
Journal of Environmental Protection (JEP) , 2019, DOI: 10.4236/jep.2019.103024
Abstract: The majority of the population and economic activity of the northern half of Vietnam is clustered in the Red River Delta and about half of the country’s rice production takes place here. There are significant problems associated with its geographical position and the intensive exploitation of resources by an overabundant population (population density of 962 inhabitants/km2). Some thirty years after the economic liberalization and the opening of the country to international markets, agricultural land use patterns in the Red River Delta, particularly in the coastal area, have undergone many changes. Remote sensing is a particularly powerful tool in processing and providing spatial information for monitoring land use changes. The main methodological objective is to find a solution to process the many heterogeneous coastal land use parameters, so as to describe it in all its complexity, specifically by making use of the latest European satellite data (Sentinel-2). This complexity is due to local variations in ecological conditions, but also to anthropogenic factors that directly and indirectly influence land use dynamics. The methodological objective was to develop a new Geographic Object-based Image Analysis (GEOBIA) approach for mapping coastal areas using Sentinel-2 data and Landsat 8. By developing a new segmentation, accuracy measure, in this study was determined that segmentation accuracies decrease with increasing segmentation scales and that the negative impact of under-segmentation errors significantly increases at a large scale. An Estimation of Scale Parameter (ESP) tool was then used to determine the optimal segmentation parameter values. A popular machine learning algorithms (Random Forests-RFs) is used. For all classifications algorithm, an increase in overall accuracy was observed with the full synergistic combination of available data sets.
Online Identities: National and Cultural Expression Online, an Australian Perspective
Celia Lam
Studies in Media and Communication , 2013, DOI: 10.11114/smc.v1i1.29
Abstract: Over the last decade the genesis and use of Social Networking Sites (SNS) has steadily gained traction with the almost instant popularity of sites such as Youtube, Facebook, Cyworld and Twitter to name a few. In Australia, as in the rest of the developed and developing world, Social Media (SM) use has become an integral part of the communication, entertainment and media practices of large sections of the population, with participation in online communities often employing the same social capital and patterns of communication that occur in offline encounters. Online interaction in SNS necessitates the creation of an individual’s online identity, and with it notions of representation and group-affiliation come to the fore. The policy of multiculturalism in Australia encourages the interaction of minority (ethnic) Cultural identities with the dominant (national) Australian identity. This study examines the role online interaction plays in an individual’s engagement with these two notions of identity by focusing on the SM use of students at a University in Australia. Results reveal a highly nuanced expression of self-hood where National and Cultural identities are enacted as minor components of a holistic Personal online identity.
Forging a Socialist Homeland from Multiple Worlds: North American Finns in Soviet Karelia 1921-1938
Kitty Lam
Revista Romana de Studii Baltice si Nordice , 2010,
Abstract: In the early 1930s, the Soviet Union recruited an estimated 6,000 Finns from North America to augment the number of skilled workers in the recently established Karelian Autonomous Republic. Using migrants' letters and memoirs held at the Immigration History Research Center, this essay examines how these North American Finns adapted and responded to fluctuating policies in the Soviet Union that originally flaunted the foreign workers as leaders in the Soviet modernization drive and as the vanguard for exporting revolution, but eventually condemned them as an enemy nation to be expunged. It also analyzes the extent to which these immigrants internalized 'building socialism' as part of their encounter with Soviet Karelia. Such an exploration requires assessing how these settlers’ ideological adaptation affected their experiences. This paper argues that by placing the North American Finns’ experience in the wider context of Soviet state building policies, these migrants’ identity formation involved participation in, avoidance of, and opposition to the terms of daily life that emerged within the purview of building socialism.
Factores psicosociales y depresión antenatal en mujeres gestantes. Estudio multicéntrico en tres hospitales de Lima, Perú. Abril a junio de 2008.
Nelly Lam
Revista Peruana de Epidemiologia , 2010,
Abstract: Objetivo: Determinar las correlaciones y asociaciones de riesgo entre sintomatología depresiva y casos probables de depresión mayor según factores psicosociales. Métodos: Estudio observacional transversal analítico en tres hospitales Lima, Perú: Instituto Nacional Materno Perinatal (INMP), Hospital Nacional Docente Madre Ni o “San Bartolomé” (HONADOMANI) y Hospital Nacional Arzobispo Loayza (HNAL). Muestra probabilística de 593 gestantes. Se utilizó la Escala de la Depresión de Edimburgo (EPDS) para medir sintomatología depresiva y casos probables de depresión mayor. Resultados: Coeficiente Alfa de Cronbach de 0.836 para EPDS. Estructura multidimensional de dos factores que explica el 54.67% de la varianza. La prevalencia de casos probables de depresión mayor de 34.1%. Según regresión logística, fueron factores asociados independientes para probable depresión mayor: antecedente de aborto (OR=1.71; IC95%:1.15-2.54; p<0.01), no planificación de embarazo (OR: 1.81; IC95%: 1.23-2.66; p<0.01), apoyo emocional (OR: 0.45; IC95%: 0.26-0.78; p<0.01), apoyo afectivo (OR: 0.29; IC95%: 0.19-0.43; p<0.05), antecedente de violencia (OR: 3.96; IC95%: 2.68-5.85; p<0.01). Conclusiones: La EPDS es un cuestionario confiable y posiblemente válido para ser utilizado en la identificación de sintomatología depresiva y de probables casos de depresión mayor en población gestante de Lima (Perú). El estudio revela una alta prevalencia de casos probables de depresión mayor y encuentra asociaciones significativas en relación a los factores psicosociales referidos por la literatura especializada.
The Pancreatic Renin-Angiotensin System: Does It Play a Role in Endocrine Oncology?
Lam KY
JOP Journal of the Pancreas , 2001,
Abstract: The characterization of a local renin-angiotensin system in the pancreas has attracted much attention because of its potential clinical applications. A pancreatic renin-angiotensin system may be present in humans and may interact with islet cells. Nevertheless, our knowledge of the renin-angiotensin system in the human pancreas is still in its infancy, especially in the field of endocrine oncology. Much of our knowledge stems from the study of the pancreas and pancreatic endocrine tumors of rodents. Thus, the direction of future research should be based on in-depth and collaborative efforts between researchers in the various disciplines in order to apply the newly acquired scientific knowledge to the patient.
Book Review: Identity Construction Among Chinese-Vietnamese Americans by Monica Trieu
Ha Lam
Journal of Southeast Asian American Education and Advancement , 2010,
Recovery of the Shape of the Mass Power Spectrum from the Lyman-alpha Forest
Lam Hui
Physics , 1998, DOI: 10.1086/307134
Abstract: We propose a method for recovering the shape of the mass power spectrum on large scales from the transmission fluctuations of the Lyman-alpha forest, which takes into account directly redshift-space distortions. The procedure, in discretized form, involves the inversion of a triangular matrix which projects the mass power spectrum in 3-D real-space to the transmission power spectrum in 1-D redshift-space. We illustrate the method by performing a linear calculation relating the two. A method that does not take into account redshift-space anisotropy tends to underestimate the steepness of the mass power spectrum, in the case of linear distortions. The issue of the effective bias-factor for the linear distortion kernel is discussed.
Line versus Flux Statistics -- Considerations for the Low Redshift Lyman-alpha Forest
Lam Hui
Physics , 2003,
Abstract: The flux/transmission power spectrum has become a popular statistical tool in studies of the high redshift ($z > 2$) Lyman-alpha forest. At low redshifts, where the forest has thinned out into a series of well-isolated absorption lines, the motivation for flux statistics is less obvious. Here, we study the relative merits of flux versus line correlations, and derive a simple condition under which one is favored over the other on purely statistical grounds. Systematic errors probably play an important role in this discussion, and they are outlined as well.
Totally Asymmetric Torsion on Riemann-Cartan Manifold
Yuyiu Lam
Physics , 2002,
Abstract: A relativistic theory constructed on Riemann-Cartan manifold with a derived totally antisymmetric torsion is proposed. It follows the coincidence of the autoparallel curve and metric geodesic. The totally antisymmetric torsion naturally appears in the theory without any ad hoc imposed on.
On Exact Solutions of the Navier-Stokes Equations for Uni-directional Flows
F. Lam
Physics , 2015,
Abstract: In the present note, we show that the uni-directional flows in a rectangular channel and in a circular pipe are exact spatio-temporal solutions of the Navier-Stokes equations over a short time interval. We assert that the classical plane Poiseuille-Couette flow and Hagen-Poiseuille flow are time-independent approximations of the exact solutions if an appropriate initial velocity distribution at starting location is specified. Conceptually, there do not exist absolute steady flows starting from unspecified initial data. The classic experimental measurements by Poiseuille can be explained in terms of the evolutional solutions. In particular, the pipe flow does not have a time-independent characteristic velocity. The orthodox notion that the parabolic profile exists for arbitrary Reynolds numbers is unwarranted.
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