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Modeling Daily Average Temperatures in a Coastal Site of Central Africa: An Analysis of Seasonal Divisions

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Atmospheric and Climate Sciences 2023年第3期13卷 341-352页

作者： Jean-Pierre Bell Esther C. Modi-Mbog Nicodeme Djiedeu laurent nana Department of Physics Faculty of Science University of Douala Douala Cameroon Department of National Meteorology Ministry of Transport Yaoundé Cameroon CEPAMOQ Ecoles Doctorales University of Douala Douala Cameroon

The seasonality and day-to-day variation of near-surface temperature patterns can greatly control nearly all physical and biological processes though temperature predictions at such scales remain challenging. This paper implements a simple analytical approach in order to generate daily average temperatures which implicitly accounts for surface heating and drivers through a comprehensive representation of station-based temperature records on a universal standard calendar propagated by the earth’s dynamics features. The modeled and observed pattern of daily temperatures exhibits a close agreement with the level of strength agreement exceeding 0.56. The extreme high and low values of the observed temperature patterns are equally well captured although model underestimates the probability of temperatures around the two modal peaks (~25.6℃ and 27.5℃). Additionally, a theoretical thermal-based division led to the identification of six seasons, including two hot and cold periods along with two pairs of mixed hot-cold. The theoretical division proposed here appears to be a good approximation for the understanding of rainfall seasonality in this area.

关键词： Daily Temperature Estimates Earth’s Dynamics Seasonal Divisions

A Decision Support Framework for the Choice of Languages and Methods for the Design of Real Time Embedded Systems

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Journal of Software Engineering and Applications 2016年第7期9卷 353-397页

作者： Valéry M. Monthe laurent nana Georges E. Kouamou Claude Tangha Department of Computer Science University of Yaounde 1 Yaounde Cameroon Lab-STICC (UMR CNRS 6285) Department of Computer Science University of Brest Brest France Department of Computer Engineering National Advanced School of Engineering Yaounde Cameroon

The choice of methods or design languages is a crucial phase in the development of systems and software, also for real time and embedded systems. An open question that remains in the design of these types of systems is to build a method, or to choose one among those existing, capable to cover the life cycle of a project, and particularly the development phases. This article contributes to answer the question, by proposing an approach based on a multi-criteria comparative study, of few languages and methods dedicated to the design of real time and embedded systems. The underlying objective of this work is to present to designers a wide range of approaches, and elements that can guide their choices. In order to reach this goal, we propose different comparison criteria. Each criterion is divided into sub-criteria, so that the designers can refine their choices according to the qualities they prefer and wish to have in the method or language. We also define a rating scale which is used to assess the retained languages and methods. The scores obtained from this assessment are presented in tables, one table per criterion, followed by a summary table giving the overall scores. Graphics built from these tables are provided and intend to facilitate the judgement and thus the choice of the designers.

关键词： Design Method Modelling Language Real-Time System Embedded System Comparison Criteria

Measuring Watermarking Robustness Using Fractal Dimensions

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通讯和计算机（中英文版） 2010年第1期7卷 10-20页

作者： Abdelhamid Benhocine Lamri Laouamer laurent, Tchamnda nana Anca Christine Pascu Information System Department Business and Administration College Qassim University A1Melaidah 51452 KSA European University of Brittany University of Brest Laboratory of Computer Science for Complex Systems （LISyC） Brest 29238France

The authors present a new approach for measuring watermarking robustness in the case of color attacks of rgb-color watermarked images. This approach is applied to evaluate the robustness of our algorithm to watermark an rgb-color image by modifying pixels colors. It is based on Kolmogorov-Smirnov test and it uses fractal dimensions to quantify modified color pixels. The authors test smooth and textured images, smooth and textured marks and 6 types of attacks: JPEG, Median, Noise, PSNR, RML, ROT.

关键词：彩色图像水印分形维数测量 Kolmogorov 稳健性鲁棒性水印峰值信噪比纹理图像

Challenges and opportunities in remote sensing-based crop monitoring: a review

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National Science Review 2023年第4期10卷 203-219页

作者： Bingfang Wu Miao Zhang Hongwei Zeng Fuyou Tian Andries B Potgieter Xingli Qin nana Yan Sheng Chang Yan Zhao Qinghan Dong Vijendra Boken Dmitry Plotnikov Huadong Guo Fangming Wu Hang Zhao Bart Deronde laurent Tits Evgeny Loupian State Key Laboratory of Remote Sensing Science Aerospace Information Research Institute Chinese Academy of Sciences School of Resources and Environment University of Chinese Academy of Sciences Executive Committee of Group on Earth Observations Global Agricultural Monitoring (GEOGLAM) Queensland Alliance for Agriculture and Food Innovation The University of Queensland Department of Remote Sensing Flemish Institute of Technological Research Department of Geography and Earth Science University of Nebraska-Kearney Department of Satellite Monitoring Technologies Space Research Institute of Russian Academy of Sciences

Building a more resilient food system for sustainable development and reducing uncertainty in global food markets both require concurrent and near-real-time and reliable crop information for decision ***-driven crop monitoring has become a main method to derive crop information at local, regional,and global scales by revealing the spatial and temporal dimensions of crop growth status and ***, there is a lack of quantitative, objective, and robust methods to ensure the reliability of crop information, which reduces the applicability of crop monitoring and leads to uncertain and undesirable consequences. In this paper, we review recent progress in crop monitoring and identify the challenges and opportunities in future efforts. We find that satellite-derived metrics do not fully capture determinants of crop production and do not quantitatively interpret crop growth status; the later can be advanced by integrating effective satellite-derived metrics and new onboard sensors. We have identified that ground data accessibility and the negative effects of knowledge-based analyses are two essential issues in crop monitoring that reduce the applicability of crop monitoring for decisions on food security. Crowdsourcing is one solution to overcome the restrictions of ground-truth data accessibility. We argue that user participation in the complete process of crop monitoring could improve the reliability of crop *** users to obtain crop information from multiple sources could prevent unconscious ***, there is a need to avoid conflicts of interest in publishing publicly available crop information.

关键词： crop monitoring crop condition crop production Ground data Remote Sensing

Chronic Lymphoedema and Bone Infarction: Rare Complications of Multiple Segmental Fractures of the Lower Limb in a Young Adult

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Open Journal of Orthopedics 2022年第3期12卷 79-84页

作者： Ngo Yamben Marie-Ange nana Chunteng Theophile Nseme Etouckey Eric Muluem Kennedy Olivier Tsiagadigui Tsiagadigui Jean Gustave Ndongo Mvela laurent Stephane Manga Alexandre Guifo Marc Leroy Faculty of Medecine and Biomedical Sciences Department of Surgery and Specialities University of Yaounde 1 Yaounde Cameroon National Center of Rehabilitation of Disabilities Persons Yaounde Cameroon Faculty of Health Sciences Department of Surgery University of Buea Buea Cameroon Teaching Hospital of Yaounde Yaounde Cameroun

Multiple segmental fractures of the lower limbs, common in developing countries, are the prerogative of Road Traffic Accidents (RTA) involving two-wheeled vehicles. Their management is difficult, associated with complications, and is most often based on a two-stage strategy: Damage Control Orthopaedics, followed by delayed internal osteosynthesis. The aim is to allow early functional rehabilitation and rapid recovery of patients. We report the case of a 39-year-old man, bike rider, after his RTA, presented with segmental homolateral fractures of the femur and two bones of the left leg. Short-term evolution was marked by the appearance of significant lymphedema and bone infarctions of the lower left limb necessitating a transfemoral amputation. Through this observation, the authors highlight the problems related to the complexity of the management of multiple segmental fractures of the lower limb by emphasizing two post-traumatic complications rarely described but to be feared: chronic lymphedema and bone infarction.

关键词： Lymphœdema Multiple Fractures Bone Infarction Amputation Damage Control Orthopaedic