Assimilation of GPS Radio Occultation Data for an Intense Atmospheric River with the NCEP Regional GSI System

2011 ◽  
Vol 139 (7) ◽  
pp. 2170-2183 ◽  
Author(s):  
Zaizhong Ma ◽  
Ying-Hwa Kuo ◽  
F. Martin Ralph ◽  
Paul J. Neiman ◽  
Gary A. Wick ◽  
...  
Keyword(s):  
Western Europe ◽  
Radio Occultation ◽  
Single Case ◽  
Horizontal Structure ◽  
Observation Operator ◽  
Gps Radio Occultation ◽  
Phase Observation ◽  
Excess Phase ◽  
The Impact

Abstract This paper uses a case study to explore the potential of Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) and Challenging Minisatellite Payload (CHAMP) global positioning system (GPS) radio occultation (RO) satellite data over the eastern Pacific Ocean to improve analyses and mesoscale forecasts of landfalling atmospheric rivers (ARs) along the U.S. West Coast. The case study is from early November 2006 and was a very high-impact event in the Pacific Northwest where it created torrential rainfall and severe flooding. Recent studies have shown that the COSMIC data offshore have the ability to better define the vertical and horizontal structure of the strong AR. This paper extends the earlier work by assessing the impact of assimilating the COSMIC data into the Advanced Research Weather Research and Forecasting (ARW-WRF) mesoscale numerical model (using a nested mode with 36-, 12-, and 4-km grid sizes) on a key 24-h forecast. The data are assimilated using NCEP’s Gridpoint Statistical Interpolation (GSI), and impacts are evaluated using Special Sensor Microwave Imager (SSM/I) satellite observations over the ocean and precipitation observations over land. The assimilation of GPS RO soundings made use of a local refractivity observation operator as well as an advanced nonlocal excess phase observation operator that considers the effects of atmospheric horizontal gradients. The results show that the assimilation of GPS RO soundings improved the moisture analysis for this AR event. This result supports conclusions from earlier observing systems simulation experiment (OSSE) studies, but in a real event. The use of a nonlocal excess phase observation operator can produce larger and more robust analysis increments. Although this is a single case study, the results are likely representative of the potential impacts of assimilating COSMIC data in other extreme AR and precipitation events and in other regions affected by landfalling ARs, for example, western Europe, western South America, and New Zealand.

Parallelization Strategies for the GPS Radio Occultation Data Assimilation with a Nonlocal Operator in the Weather Research and Forecasting Model

2014 ◽  
Vol 31 (9) ◽  
pp. 2008-2014 ◽  
Author(s):  
Xin Zhang ◽  
Ying-Hwa Kuo ◽  
Shu-Ya Chen ◽  
Xiang-Yu Huang ◽  
Ling-Feng Hsiao
Keyword(s):  
Data Assimilation ◽  
Radio Occultation ◽  
Weather Prediction ◽  
Weather Research And Forecasting ◽  
Forecasting Model ◽  
Observation Operator ◽  
Gps Radio Occultation ◽  
Phase Observation ◽  
Excess Phase ◽  
Weather Research

Abstract The nonlocal excess phase observation operator for assimilating the global positioning system (GPS) radio occultation (RO) sounding data has been proven by some research papers to produce significantly better analyses for numerical weather prediction (NWP) compared to the local refractivity observation operator. However, the high computational cost and the difficulties in parallelization associated with the nonlocal GPS RO operator deter its application in research and operational NWP practices. In this article, two strategies are designed and implemented in the data assimilation system for the Weather Research and Forecasting Model to demonstrate the capability of parallel assimilation of GPS RO profiles with the nonlocal excess phase observation operator. In particular, to solve the parallel load imbalance problem due to the uneven geographic distribution of the GPS RO observations, round-robin scheduling is adopted to distribute GPS RO observations among the processing cores to balance the workload. The wall clock time required to complete a five-iteration minimization on a demonstration Antarctic case with 106 GPS RO observations is reduced from more than 3.5 h with a single processing core to 2.5 min with 106 processing cores. These strategies present the possibility of application of the nonlocal GPS RO excess phase observation operator in operational data assimilation systems with a cutoff time limit.

The impact of business networks on foreign subsidiaries development

IMP Journal ◽  
2018 ◽  
Vol 12 (3) ◽  
pp. 427-443
Author(s):  
Enrico Baraldi ◽  
Francesco Ciabuschi ◽  
Olof Lindahl ◽  
Andrea Perna ◽  
Gian Luca Gregori
Keyword(s):  
Single Case ◽  
Foreign Market ◽  
Business Networks ◽  
International Expansion ◽  
Content Type ◽  
Fine Grained ◽  
Automatic Control Systems ◽  
Industrial Networks ◽  
The Impact

Purpose The purpose of this paper is to explore two specific areas pertaining to industrial networks and international business (IB). First, the authors look at how business relationships influence the internationalization in time, from the establishment of the first subsidiary in a foreign market to the following ones, and in space, that is, across different markets. Second, the authors investigate how an increasing external network dependence of subsidiaries in their internationalization may cause a detachment of a subsidiary from the mother company as its knowledge becomes insufficient to guide a subsidiary’s internationalization. Design/methodology/approach This paper utilizes an exploratory, longitudinal, single-case study of Loccioni – a manufacturer of measuring and automatic control systems for industrial customers – to illustrate the specific dynamics of the influences of industrial networks on the internationalization of subsidiaries. Findings The case study helps to elucidate the roles, entailing also free will and own initiative, of small suppliers’ subsidiaries which operate inside several global factories, and how “surfing” on many different global factories, by means of several local subsidiaries, actually supports these suppliers’ own international developments. This notion adds to our understanding of the global factory phenomenon a supplier focus that stresses how the role of suppliers is not merely that of being passive recipients of activities and directions from a focal orchestrating firm, but can also be that of initiative-takers themselves. Originality/value The paper contributes to the IMP tradition by providing a multi-layered and geographically more fine-grained view of the network embedding companies that operate on internationalized markets. This paper thereby sheds light on a less investigated area of research within the IMP tradition: the link between internationalization in different countries and the interconnectedness between the industrial networks spanning these countries. At the same time, this paper contributes to IB theories by showing how a late-internationalizing SME can enter highly international markets by “plugging into” several established “Global Factories” as a way to exploit further opportunities for international expansion.

Sanctioned to Survive: How Foreign Firms Perform when Economic Sanctions Affect their Business Relationships—A Study of Contemporary Economic Sanction Actions and their Impact

2017 ◽  
Vol 16 (5) ◽  
pp. 501-538
Author(s):  
Blaine Stout
Keyword(s):  
Single Case ◽  
Economic Sanctions ◽  
The United States ◽  
Study Strategies ◽  
Foreign Firms ◽  
Case Study Methodology ◽  
Exxon Mobil ◽  
Historical Accounts ◽  
The Impact

Abstract The intent of this study is to examine the effects of economic sanctions on companies with significant fdi operating in the sanctioned country. Using case study methodology, we consider the impact of sanctions imposed on the Russian Federation (rf) by the United States of America for its intrusion into the sovereign rights of Ukraine. Past sanction events in South Africa and pre-rf formation are reviewed. Two measurable frameworks are developed to study strategies based on ‘divestment and non-divestment’ (Malone and Goodin 1997) dimensions and coupled with variables related to ‘direct and indirect’ effects on financial performance, forgone potential, (Losman 1988) and foreign direct investment (Biglaiser and Lektzian 2011). This research also relies on the historical accounts of Hufbauer et al. (2007) for the compilation of facts related to economic sanctions. Through literature review, the study asks: 1) Strategically, how does a company respond to the economic sanctions imposed by its home country on the sanctioned country in which it has significant fdi? 2) Financially, how do economic sanctions affect the company’s performance and fdi? and 3) Organizationally, how do economic sanctions affect the relationships with those recipient companies of fdi? The study focus is on the energy industry in which the rf economy relies upon for 40 percent of its sustainability and the company of focus is Exxon Mobil (xom). The author readily acknowledges that a single case study may not provide the degree of conclusiveness found in a cross-case study format. However, the outcome of the study does provide a template for use in future case reviews.

Three stages of entrepreneurial orientation: the founder’s role

2019 ◽  
Vol 26 (2) ◽  
pp. 285-306 ◽  
Author(s):  
Torbjörn Ljungkvist ◽  
Börje Boers ◽  
Joachim Samuelsson
Keyword(s):  
Entrepreneurial Orientation ◽  
Single Case ◽  
Annual Reports ◽  
Structured Interviews ◽  
Theoretical Understanding ◽  
Content Type ◽  
Five Dimensions ◽  
The Impact ◽  
Over Time

Purpose The purpose of this paper is to understand the development of the five dimensions of entrepreneurial orientation (EO) over time by taking a founder’s perspective. Design/methodology/approach The paper draws on an in-depth single-case study. It combines semi-structured interviews in the company with archival data, such as annual reports, press clips and interviews in business magazines. Findings The results indicate that the EO dimensions change from being personalized and directly solution-oriented to being intangible value-creation-oriented. Originality/value By suggesting ownership-based EO configurations, this study contributes insights into how different ownership forms propel EO. These configurations – that is, personal, administrative based and intangible focused – show the impact of the EO dimensions and provide a systematic and theoretical understanding of EO change over time.

scholarly journals A phygital approach to cultural heritage: augmented reality at Regaleira

2020 ◽  
Vol 11 (22) ◽  
pp. 15 ◽  
Author(s):  
José Gabriel Andrade ◽  
Patrícia Dias
Keyword(s):  
Augmented Reality ◽  
Cultural Heritage ◽  
Technological Development ◽  
Single Case ◽  
Physical World ◽  
Creative Industries ◽  
Contemporary Society ◽  
Alternative Conceptualization ◽  
The Impact

<p>In the last two decades, contemporary society has been conceptualized and discussed around the assumption that digital technologies are its most defining feature. Jean Baudrillard’s take on the Fable of Borges suggests a replacement of the physical world by a virtual experiencing life, setting the tone for a pessimistic and somewhat fearful attitude towards technological development. On the verge of the dissemination of disruptive innovations that can be described under the “umbrella” of Internet of Things (IoT), we observe not a replacement, but a deep and complex intertwining of online and offline experiences, sketching the contours of what can become a phygital society. This alternative conceptualization of our contemporary society, combined with the possibilities of technological development, affords new opportunities for the expression and experiencing of culture, and also for the creative industries. In our research, we explore the impact of one augmented reality (AR) app designed for one of the landmarks of the Portuguese cultural heritage, Quinta da Regaleira. We explored this single-case study using qualitative data collection techniques, aiming to discuss the positive and negative outcomes of this innovation, both for the dynamizing of cultural heritage, and for the visitors. The article provides useful information for heritage spaces that wish to follow this path. It describes the main steps to be taken in the production of content and provides examples of the narrative model that helps people to visit the space and obtain information, knowing stories relevant to the past and present of the cultural heritage. The objective is to clarify, finally, due to the research developed in the Quinta da Regaleira case study, what kind of stories and experiences can be narrated, the strengths of this application, its limitations, and paths for future investigations.</p>

scholarly journals Educational Response to a Student with Psychosis at the Secondary Level: A Non-Experimental Single-Case Study

2020 ◽  
Vol 10 (4) ◽  
pp. 1080-1094
Author(s):  
Juan Pedro Martínez-Ramón ◽  
Inmaculada Méndez ◽  
Cecilia Ruiz Esteban
Keyword(s):  
Cognitive Abilities ◽  
Single Case ◽  
Personal Characteristics ◽  
Secondary Level ◽  
Quantitative Information ◽  
Educational Systems ◽  
Single Case Study ◽  
Teaching Learning ◽  
The Impact

Students with psychosis in school within the ordinary education system are a reality in the classroom. To study their correct adaptation at school, it is necessary to consider numerous factors such as the personal characteristics of the student, environmental variables, educational measures put in place as well as emotional and cognitive aspects. The aim of this research was to monitor the teaching–learning process of a student diagnosed with psychosis and enrolled in a public school at the secondary level in the ordinary modality with support during an academic year, with the usual resources provided by a guidance department to assess the impact of the educational measures and plans on his emotional and academic fields. This was a single case study in which both qualitative and quantitative information was collected (N = 1). The participant was a student with special needs at the secondary level. An analysis of the results of psychometric tests, plan for diversity, observational analysis, academic file, scholastic history, and multiple interviews were carried out. The findings show how the educational curriculum can be adapted to improve the competences of a student with psychosis by encouraging an increase in social abilities and potential cognitive abilities through the counseling department. The conclusions of this research can provide a guideline for comparison of different educational systems, paying greater attention to the development of emotional aspects, and opting for inclusive measures. In this line, this study shows that students with psychosis can share classrooms and studies with their peers, thus fulfilling the principle of educational inclusion.

Lean Six Sigma in higher education institutes: an Irish case study

2019 ◽  
Vol 10 (4) ◽  
pp. 948-974 ◽  
Author(s):  
Seamus J. O’Reilly ◽  
Joe Healy ◽  
Tom Murphy ◽  
Rónán Ó’Dubhghaill
Keyword(s):  
Higher Education ◽  
Six Sigma ◽  
Single Case ◽  
Lean Six Sigma ◽  
Research Approach ◽  
Content Type ◽  
Training Programmes ◽  
The Impact

Purpose This paper aims to contribute to a developing literature on continuous improvement (CI), enabled by Lean Six Sigma (LSS), in higher education institutions (HEIs). It reports on the key learning points arising from the initial steps taken by an Irish university on its CI journey. Design/methodology/approach A case study strategy was adopted following a participatory research approach. This approach supports reflexivity and also provides access to all relevant documentation and staff within the case university. Thematic analysis was supported by data reduction and display techniques. Findings The introduction of a LSS approach rather than a reliance on lean alone introduced a structured methodology (DMAIC) that supported simplification of a number of administrative processes. A number of specific improvements were achieved including: Cycle time and cost reduction; customer or employee satisfaction; and rework and error reduction. The findings support the importance of the Readiness Factors as identified by Antony (2014), with particular insight into the role of senior and middle management, the impact of training and deployment of expertise. Research limitations/implications This paper is based on an ongoing, longitudinal, empirical study of a single case study in Ireland. Originality/value This paper tracks the development of CI in a HEI in a longitudinal manner and adds to the emerging the literature in this area. The paper evaluates the role of management at various levels, analyses the use of LSS tools and techniques and evaluated the role of training and capacity building. Implications for Management are shared including: design and role of training programmes, role of champions at various organisational levels, including key functional areas and sustaining momentum.

Enabling integrated business planning through big data analytics: a case study on sales and operations planning

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Alexander Schlegel ◽  
Hendrik Sebastian Birkel ◽  
Evi Hartmann
Keyword(s):  
Big Data ◽  
Information Processing ◽  
Data Analytics ◽  
Single Case ◽  
Big Data Analytics ◽  
Business Planning ◽  
Operations Planning ◽  
Content Type ◽  
The Impact

PurposeThe purpose of this study is to investigate how big data analytics capabilities (BDAC) enable the implementation of integrated business planning (IBP) – the advanced form of sales and operations planning (S&OP) – by counteracting the increasing information processing requirements.Design/methodology/approachThe research model is grounded in the organizational information processing theory (OIPT). An embedded single case study on a multinational agrochemical company with multiple geographically distinguished sub-units of analysis was conducted. Data were collected in workshops, semistructured interviews as well as direct observations and enriched by secondary data from internal company sources as well as publicly available sources.FindingsThe results show the relevancy of establishing BDAC within an organization to apply IBP by providing empirical evidence of BDA solutions in S&OP. The study highlights how BDAC increase an organization's information processing capacity and consequently enable efficient and effective S&OP. Practical guidance toward the development of tangible, human and intangible BDAC in a particular sequence is given.Originality/valueThis study is the first theoretically grounded, empirical investigation of S&OP implementation journeys under consideration of the impact of BDAC.

scholarly journals A modification to the standard ionospheric correction method used in GPS radio occultation

2015 ◽  
Vol 8 (8) ◽  
pp. 3385-3393 ◽  
Author(s):  
S. B. Healy ◽  
I. D. Culverwell
Keyword(s):  
Impact Parameter ◽  
Radio Occultation ◽  
Order Term ◽  
Weather Prediction ◽  
Implicit Assumption ◽  
Ionospheric Correction ◽  
Gps Radio Occultation ◽  
Uncertainty Estimates ◽  
The Impact ◽  
Bending Angles

Abstract. A modification to the standard bending-angle correction used in GPS radio occultation (GPS-RO) is proposed. The modified approach should reduce systematic residual ionospheric errors in GPS radio occultation climatologies. A new second-order term is introduced in order to account for a known source of systematic error, which is generally neglected. The new term has the form κ(a) × (αL1(a)-αL2(a))2, where a is the impact parameter and (αL1, αL2) are the L1 and L2 bending angles, respectively. The variable κ is a weak function of the impact parameter, a, but it does depend on a priori ionospheric information. The theoretical basis of the new term is examined. The sensitivity of κ to the assumed ionospheric parameters is investigated in one-dimensional simulations, and it is shown that κ &amp;simeq; 10–20 rad−1. We note that the current implicit assumption is κ=0, and this is probably adequate for numerical weather prediction applications. However, the uncertainty in κ should be included in the uncertainty estimates for the geophysical climatologies produced from GPS-RO measurements. The limitations of the new ionospheric correction when applied to CHAMP (Challenging Minisatellite Payload) measurements are noted. These arise because of the assumption that the refractive index is unity at the satellite, made when deriving bending angles from the Doppler shift values.

Stock keeping unit rationalization: a cross-functional, cross-firm perspective

2019 ◽  
Vol 30 (4) ◽  
pp. 994-1015
Author(s):  
Matias G. Enz ◽  
Matthew A. Schwieterman ◽  
Douglas M. Lambert
Keyword(s):  
Single Case ◽  
Theoretical Perspective ◽  
Product Variety ◽  
Success Factor ◽  
Supplier Relationships ◽  
Content Type ◽  
Critical Success ◽  
Functional Involvement ◽  
The Impact

Purpose Although managers have struggled with SKU proliferation for decades, research has provided inconsistent guidance, and the cross-functional and cross-firm aspects of the problem were not considered. The purpose of this paper is to explore the factors that favor successful and sustainable SKU rationalization. Design/methodology/approach A single case study was used to investigate the implementation of an SKU rationalization project by a national restaurant chain in collaboration with its food distributor. Qualitative data analysis techniques were used to understand managers’ perceptions about the SKU rationalization problem and the financial results that were achieved. Findings The findings include seven propositions that begin to formalize theory for SKU rationalization. Cross-functional involvement was both a challenge and a critical success factor, and the supplier was an important resource for managing product variety and complexity. Research limitations/implications Seven propositions are provided that increase the likelihood of successfully dealing with SKU proliferation. Practical implications SKU proliferation increases supply chain complexity and leads to higher costs. The research reports on an SKU rationalization project that saved a company and its supplier $6.7m. Originality/value A previously unexplored theoretical perspective on SKU rationalization was employed that emphasizes cross-functional alignment, buyer–supplier relationships and the impact on financial performance of a firm.

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