Historic Sites Archaeology on the Western American Frontier: Theoretical Perspectives and Research Problems

1981 ◽  
Vol 2 (1) ◽  
pp. 67-82 ◽  
Author(s):  
Donald L. Hardesty
Keyword(s):  
Island Biogeography ◽  
Ad Hoc ◽  
Cultural Resource Management ◽  
Western United States ◽  
Historic Sites ◽  
American Frontier ◽  
Integrative Research ◽  
Theoretical Perspectives ◽  
Research Problems ◽  
New Framework

Historic sites archaeology in the western United States is booming but continues to be conducted ad hoc. The demands of assessing significance for cultural resource management purposes suggests that integrative research problems must be identified. One set of such problems emerge from the frontier concept. The use of synecological models from general ecology is proposed as a new framework within which to better understand frontier phenomena. As an illustration, one aspect of Frederick Jackson Turner's “frontier thesis” — the homogenization of frontier behavior — is examined in this light and related to historic sites research. In addition patterns of frontier colonization are studied with models of island biogeography developed by the late Robert MacArthur and E. O. Wilson.

Power Allocation in Cognitive Radio in Energy Constrained Wireless Ad Hoc Networks

2013 ◽  
pp. 248-270
Author(s):  
Tamaghna Acharya ◽  
Santi P. Maity
Keyword(s):  
Wireless Networks ◽  
Ad Hoc Networks ◽  
Power Allocation ◽  
Wireless Ad Hoc Networks ◽  
Network Lifetime ◽  
Ad Hoc ◽  
Energy Aware ◽  
Radio Frequency Spectrum ◽  
Research Problems ◽  
Hoc Networks

The acute scarcity of radio frequency spectrum has inspired to think of a new communication technology where the devices are expected to be able to sense and adapt to their spectral environment, thereby appearing as cognitive radios (CR) who can share opportunistically the bands assigned to primary users (PUs). At the same time, low cost, increased coverage, enhanced capacity, infrastructure-less configuration, and so forth, become the essence of future wireless networks. Although the two research fields came up independently, in due time it is observed that CR has a promising future and has excellent applications in wireless networks. To this aim, this chapter explores some scope of integration in CR and ad hoc networks (called here CRAHNETs) in some specific design perspective. First, a brief literature review on CR power allocation and energy aware routing in wireless ad hoc networks (WANETs) is done that highlights the importance for the scope of their integration. Then, power allocation in CRAHNETs with extended network lifetime is considered as an example problem. More specifically, the design problem is: given a set of paths (routes) between a pair of source (S) and destination (D) nodes in CRAHNETs, how to allocate optimal power to the source and relay nodes such that outage probability for data transmission is minimized and network lifetime is enhanced, while meeting the limits of total transmit power of CRs and interference threshold to PU simultaneously. A solution for the stated problem is proposed along with performance evaluation. A few related research problems are mentioned as future research directions.

Sensing Coverage and Connectivity in Cognitive Radio Sensor Networks

2016 ◽  
pp. 608-633
Author(s):  
Ecehan Berk Pehlivanoğlu ◽  
Mustafa Özger ◽  
Özgür Barış Akan
Keyword(s):  
Cognitive Radio ◽  
Sensor Networks ◽  
Performance Measures ◽  
Ad Hoc ◽  
Sensing Coverage ◽  
Cognitive Radio Sensor Networks ◽  
Research Problems ◽  
Coverage Quality ◽  
Coverage And Connectivity ◽  
Hoc Networks

Sensing coverage of a field of interest and connectivity are two very important performance measures in Wireless Sensor Networks (WSNs). Existing design methodologies and protocols for enhanced field sensing coverage and connectivity in WSNs are not directly applicable to Cognitive Radio Sensor Networks (CRSNs) due to their cognitive nature. In this chapter, the authors first review sensing coverage and connectivity models for traditional WSNs. Then, they propose novel approaches for sensing coverage and connectivity establishment in CRSN, benefiting from useful existing models from WSN and Cognitive Radio Ad Hoc Networks (CRAHNs). Proposed approaches span a wide variety of CRSN requirements and also point out open research problems in the field to guarantee sufficient sensing coverage quality and connectivity in CRSN.

ESTIMATING VOLATILITY FUNCTIONALS WITH MULTIPLE TRANSACTIONS

2016 ◽  
Vol 33 (2) ◽  
pp. 331-365 ◽  
Author(s):  
Bing-Yi Jing ◽  
Zhi Liu ◽  
Xin-Bing Kong
Keyword(s):  
High Frequency ◽  
Ad Hoc ◽  
Asymptotic Properties ◽  
Financial Econometrics ◽  
Future Research ◽  
Simulation Studies ◽  
Recording Time ◽  
Integrated Volatility ◽  
Research Problems ◽  
Real World Problems

The phenomenon of multiple transactions at each recording time is a common occurrence for high-frequency financial data because of the heavy trading of the market and limitation of the recording mechanism. This situation has existed for many years, but has become more common in recent years because of heavier trading. Surprisingly, there have been few studies on this important issue, in spite of some ad hoc approaches to treat multiple transactions. In this paper we investigate how to handle multiple transactions, particularly in the context of estimating the integrated volatility and integrated quarticity, which are of great interest in financial econometrics. Two approaches are proposed for this purpose, and their asymptotic properties are investigated. Their performances are confirmed by simulation studies. The estimators are also applied to some real world problems. The work represents only the first step in this direction, and some future research problems are discussed.

Mapping the field of studies on social class and educational inequalities in Argentina

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Analía Inés Meo
Keyword(s):  
Social Class ◽  
Secondary Level ◽  
Sociology Of Education ◽  
Educational Inequalities ◽  
Research Traditions ◽  
Theoretical Perspectives ◽  
Wide Range ◽  
Research Problems

This paper maps the research on social class and educational inequalities at secondary level in Argentina. It offers a typology of studies according to their research problems, theoretical perspectives and methodology. It distinguishes four kinds of research traditions: the socio-structural, the socio-historical, the socioeducational and the identity and subjectivity turn. It is argued that, in the sub-field of Sociology of Education, there is coexistence of diverse and even antagonistic research traditions. Furthermore, this diversity could be understood both as a sign of the vitality of the field and of its low structuration and limitations. The vitality of the field is illustrated by the wide range of topics, questions, theories and methods used by researchers since the 1980s. Among the indicators of the low structuration of Sociology of Education, the author identifies the persistence of theoretical 'silences’ and the marginality of reflexive accounts on how, who and what for knowledge is produced.

scholarly journals A Middleware Framework between Mobility and IoT Using IEEE 802.15.4e Sensor Networks

2020 ◽  
Vol 4 (2) ◽  
pp. 90
Author(s):  
Tanweer Alam
Keyword(s):  
Sensor Networks ◽  
Internet Of Things ◽  
Sensor Network ◽  
Ad Hoc ◽  
The Internet ◽  
Efficient Simulation ◽  
Physical Objects ◽  
Ad Hoc Sensor Networks ◽  
The Internet Of Things ◽  
New Framework

In this paper, we propose a mobility framework for connecting the physical things in wireless ad hoc sensor networks. Our area of study is the internet of things by using an ad hoc sensor network. Our purpose in this study is to create a mobility framework for the internet of things. For example- how we connect many physical objects and give them a sense of sensing each other in an ad hoc environment. We can connect different physical objects in a framework of an ad hoc sensor network. Our main contribution is a new methodology for simulating mobility physical objects for the internet of things. Our methodology uses the correct and efficient simulation of the desired study and can be implemented in a framework of ad hoc sensor networks. Our study will generate a new framework for solving the issue of connectivity among physical objects. The proposed mobility framework is feasible to run among physical objects using the ad hoc sensor network.

Mobile Ad Hoc Networks

2011 ◽  
pp. 31-47 ◽  
Author(s):  
Crescenzio Gallo ◽  
Michele Perilli ◽  
Michelangelo De Bonis
Keyword(s):  
Ad Hoc Networks ◽  
Mobile Ad Hoc Networks ◽  
Communication Networks ◽  
Ad Hoc ◽  
Point Of View ◽  
Practical Implementation ◽  
Link Stability ◽  
Research Problems ◽  
Mobile Ad Hoc ◽  
Hoc Networks

Mobile communication networks have become an integral part of our society, significantly enhancing communication capabilities. Mobile ad hoc networks (MANETs) extend this capability to any time/anywhere communication, providing connectivity without the need of an underlying infrastructure. The new coming realm of mobile ad hoc networks is first investigated, focusing on research problems related to the design and development of routing protocols, both from a formal and technical point of view. Then link stability in a high mobility environment is examined, and a route discovery mechanism is analyzed, together with a practical implementation of a routing protocol in ad hoc multi-rate environments which privileges link stability instead of traditional speed and minimum distance approaches.

Sensing Coverage and Connectivity in Cognitive Radio Sensor Networks

2014 ◽  
pp. 1-26
Author(s):  
Ecehan Berk Pehlivanoğlu ◽  
Mustafa Özger ◽  
Özgür Barış Akan
Keyword(s):  
Cognitive Radio ◽  
Sensor Networks ◽  
Performance Measures ◽  
Ad Hoc ◽  
Sensing Coverage ◽  
Cognitive Radio Sensor Networks ◽  
Research Problems ◽  
Coverage Quality ◽  
Coverage And Connectivity ◽  
Hoc Networks

Sensing coverage of a field of interest and connectivity are two very important performance measures in Wireless Sensor Networks (WSNs). Existing design methodologies and protocols for enhanced field sensing coverage and connectivity in WSNs are not directly applicable to Cognitive Radio Sensor Networks (CRSNs) due to their cognitive nature. In this chapter, the authors first review sensing coverage and connectivity models for traditional WSNs. Then, they propose novel approaches for sensing coverage and connectivity establishment in CRSN, benefiting from useful existing models from WSN and Cognitive Radio Ad Hoc Networks (CRAHNs). Proposed approaches span a wide variety of CRSN requirements and also point out open research problems in the field to guarantee sufficient sensing coverage quality and connectivity in CRSN.

scholarly journals Notes from the Editor

2017 ◽  
Vol 111 (2) ◽  
pp. iii-x
Keyword(s):  
Political Science ◽  
American Political Science Review ◽  
Research Problem ◽  
General Interest ◽  
Original Research ◽  
Political Issues ◽  
Theoretical Perspectives ◽  
Research Problems ◽  
American Political Science ◽  
Important Research Problem

In this issue's Notes from the Editors, we are excited to be able to present not only our first big innovation for theAmerican Political Science Review, ourletterformat, but also articles that are concurrent with present political affairs, a difficult task due to the intricacies of peer reviewed science. We would first like to draw attention to our new publication format,letters. We hope to further the idea of publishing important insights to research problems in political science and encourage scholarly debate in the discipline. Some of these insights, however, might not fit in the traditional, longerarticleformat, which is tailored to original work advancing the understanding of political issues that are of general interest to the field of political science. Instead, letters provide an opportunity to report about original research that moves the subfields of political science forward as they develop alongside their counterparts in related disciplines, such as new theoretical perspectives, methodological progress, alternative empirical findings, as well as comments on and extensions of existing work. Moreover, our letter format attempts to increase inter-disciplinary recognition by broadening readership and eventually authorship from scholars of other disciplines that address an important research problem in political science.

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