124 research outputs found

    Millimeter-Wave System for High Data Rate Indoor Communications

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    This paper presents the realization of a wireless Gigabit Ethernet communication system operating in the 60 GHz band. The system architecture uses a single carrier modulation. A differential encoded binary phase shift keying modulation and a differential demodulation scheme are adopted for the intermediate frequency blocks. The baseband blocks use Reed- Solomon RS (255, 239) coding and decoding for channel forward error correction (FEC). First results of bit error rate (BER) measurements at 875 Mbps, without channel coding, are presented for different antennas.Comment: 5 page

    Single Carrier Architecture for High Data Rate Wireless PAN Communications System

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    A 60 GHz wireless Gigabit Ethernet (G.E.) communication system is developed at IETR. As the 60 GHz radio link operates only in a single-room configuration, an additional Radio over Fibre (RoF) link is used to ensure the communications in all the rooms of a residential environment. The realized system covers 2 GHz bandwidth. Due to the hardware constraints, a symbol rate at 875 Mbps is attained using simple single carrier architecture. In the baseband (BB) processing block, an original byte/frame synchronization process is designed to provide a smaller value of the preamble missing detection and false alarm probabilities. Bit error rate (BER) measurements have been realized in a large gym for line-of-sight (LOS) conditions. A Tx-Rx distance greater than 30 meters was attained with low BER using high gain antennas and forward error correction RS (255, 239) coding.Comment: Design, Experimentation, Measurement, Performance; IWCMC '10, Caen : France (2010

    Système de Communications Sans Fil Très Haut Débit à 60 GHz

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    National audienceThis paper presents the study and the realization at IETR of a high data rate 60 GHz wireless communications system. The system uses a simple single carrier architecture. The receiver architecture is based on a differential demodulation which minimizes the intersymbol interference (ISI) effect and a signal processing unit composed of a joint frame and byte synchronization block and a conventional RS (255, 239) decoder. The byte synchronization technique provides a high preamble detection probability and a very small value of the false detection probability. First measurement results show a good communication link quality in line of sight environments with directional antennas

    Indoor Channel Measurements and Communications System Design at 60 GHz

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    This paper presents a brief overview of several studies concerning the indoor wireless communications at 60 GHz performed by the IETR. The characterization and the modeling of the radio propagation channel are based on several measurement campaigns realized with the channel sounder developed at IETR. Some typical residential environments were also simulated by ray tracing and Gaussian Beam Tracking. The obtained results show a good agreement with the similar experimental results. Currently, the IETR is developing a high data rate wireless communication system operating at 60 GHz. The single-carrier architecture of this system is also presented.Comment: 2 page

    Toward a Gigabit Wireless Communications System

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    This paper presents the design and the realization of a hybrid wireless Gigabit Ethernet indoor communications system operating at 60 GHz. As the 60 GHz radio link operates only in a single-room configuration, an additional Radio over Fiber (RoF) link is used to ensure the communications within all the rooms of a residential environment. The system uses low complexity baseband processing modules. A byte synchronization technique is designed to provide a high value of the preamble detection probability and a very small value of the false detection probability. Conventional RS (255, 239) encoder and decoder are used for channel forward error correction (FEC). The FEC parameters are determined by the tradeoff between higher coding gain and hardware complexity. The results of bit error rate measurements at 875 Mbps are presented for various antennas configurations

    60 GHz High Data Rate Wireless Communication System

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    This paper presents the design and the realization of a 60 GHz wireless Gigabit Ethernet communication system. A differential encoded binary phase shift keying modulation (DBPSK) and differential demodulation schemes are adopted for the IF blocks. The Gigabit Ethernet interface allows a high speed transfer of multimedia files via a 60 GHz wireless link. First measurement results are shown for 875 Mbps data rate.Comment: 5 pages

    BRAND ORIGIN IDENTIFICATION, BRAND EVALUATION AND ITS RELATIONSHIP TO CUSTOMERS PURCHASE INTENTION

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    The aims of this research study are to examine first the performance of consumers in identifying the correct country of origin of different brands of Laptop. Next, to investigate the factors facilitate the correct brand origin classification. Then, to identify the implication of correct or incorrect or don't know brand origin classification on the brand evaluation. And finally, to determine the relationship between purchase intention and brand evaluation. The results from the sample in Yogyakarta specify that consumers' ability to classify the laptop brands correctly according to their own origin is limited. Customers prefer misclassification or even don't know. Moreover, the degree of involvement with the product category involved impact positively on the performance of customers to well identify the correct country of origin of the brand. However there is not differences for the customer brand origin classification according the brand is from dominant nor non dominant country. Additionally, the brand evaluation really differ from correct, wrong and don't know for some brands but this difference do not apply for all brands. the last finding from this research study is that consumer purchase intention is strongly related to the brand evaluation

    Étude Comparative des Modalités de la Price en Charge Périopératore Nutritionnelle Lors de la Chirurgie Digestive à Soissons (France) et à Tanambao (Madagascar)

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    L’état nutritionnel d’un individu influence sur sa morbi-mortalitĂ© pĂ©riopĂ©ratoire. Les complications postopĂ©ratoires sont en augmentation jusqu’à 72% chez les patients prĂ©sentant une dĂ©nutrition en pĂ©riopĂ©ratoire contre 29% chez ceux qui ne le sont pas. Le taux de mortalitĂ© en pĂ©riopĂ©ratoire de chirurgie digestive chez les sujets dĂ©nutris va jusqu’à 29%.  Objectif : Comparer les modalitĂ©s de prise en charge nutritionnelle pĂ©riopĂ©ratoire de chirurgie digestive dans les centres hospitaliers de Soissons (France) et de Tanambao (Madagascar). Patients et mĂ©thode : Il s’agit d’une Ă©tude observationnelle prospective sur douze mois (mai 2018 Ă  avril 2019). Les patients bĂ©nĂ©ficiant d’une chirurgie digestive par voie laparotomie mĂ©diane ont Ă©tĂ© inclus. Le test de Mann Whitney Ă©tait utilisĂ© pour la comparaison des variables portant sur les caractĂ©ristiques de la population d’étude, la prise en charge nutritionnelle pĂ©riopĂ©ratoire et la durĂ©e d’hospitalisation (XLSTAT® 2019.4.2). Une valeur de p infĂ©rieur Ă  0,05 Ă©tait significative.  RĂ©sultats : Quarante-sept patients âgĂ©s de 63 [32- 100] ans ont Ă©tĂ© retenus Ă  Soissons et 43 patients, âgĂ©s de 45 [18- 79] ans, Ă  Tanambao. La population d’étude Ă©tait Ă  prĂ©dominance masculine (sex ratio = 1,5 Ă  Soissons et 2,1 Ă  Toliara). La durĂ©e du jeĂ»ne prĂ©opĂ©ratoire (<2h versus ≥6h ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique prĂ©opĂ©ratoire (<25 kcal/kg/j versus sans apport ; p= 0,041 et apport protĂ©ique <1 g/kg/j versus sans apport ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique postopĂ©ratoire ([25- 30 Kcal/kg/j versus <25 Kcal/kg/j ; p<0,001 et apport protĂ©ique [1- 1,5 g/kg/j versus <1 g/kg/j ; p<0,001) et la durĂ©e d’hospitalisation (10j versus 14j ; p<0,001) Ă©taient diffĂ©rents entre les deux centres hospitaliers. Le grade nutritionnel (GN 2, p= 0,244) et la morbi-mortalitĂ© Ă©taient comparables entre les deux centres hospitaliers (absence de complications, p= 0,817). Conclusion : L’état nutritionnel pĂ©riopĂ©ratoire constitue l’un des dĂ©terminants d’une rĂ©habilitation postopĂ©ratoire optimale. La prescription du support nutritionnel et du jeĂ»ne prĂ©opĂ©ratoire devrait ĂŞtre en fonction du grade nutritionnel et doit couvrir les besoins nutritionnels quotidiens.  A Soissons (France), mais aussi Ă  Tanambao (Madagascar), cette prise en charge nutritionnelle reste Ă  amĂ©liorer suivant les recommandations. L’état nutritionnel d’un individu influence sur sa morbi-mortalitĂ© pĂ©riopĂ©ratoire. Les complications postopĂ©ratoires sont en augmentation jusqu’à 72% chez les patients prĂ©sentant une dĂ©nutrition en pĂ©riopĂ©ratoire contre 29% chez ceux qui ne le sont pas. Le taux de mortalitĂ© en pĂ©riopĂ©ratoire de chirurgie digestive chez les sujets dĂ©nutris va jusqu’à 29%.   Objectif : Comparer les modalitĂ©s de prise en charge nutritionnelle pĂ©riopĂ©ratoire de chirurgie digestive dans les centres hospitaliers de Soissons (France) et de Tanambao (Madagascar). Patients et mĂ©thode : Il s’agit d’une Ă©tude observationnelle prospective sur douze mois (mai 2018 Ă  avril 2019). Les patients bĂ©nĂ©ficiant d’une chirurgie digestive par voie laparotomie mĂ©diane ont Ă©tĂ© inclus. Le test de Mann Whitney Ă©tait utilisĂ© pour la comparaison des variables portant sur les caractĂ©ristiques de la population d’étude, la prise en charge nutritionnelle pĂ©riopĂ©ratoire et la durĂ©e d’hospitalisation (XLSTAT® 2019.4.2). Une valeur de p infĂ©rieur Ă  0,05 Ă©tait significative.  RĂ©sultats : Quarante-sept patients âgĂ©s de 63 [32- 100] ans ont Ă©tĂ© retenus Ă  Soissons et 43 patients, âgĂ©s de 45 [18- 79] ans, Ă  Tanambao. La population d’étude Ă©tait Ă  prĂ©dominance masculine (sex ratio = 1,5 Ă  Soissons et 2,1 Ă  Toliara). La durĂ©e du jeĂ»ne prĂ©opĂ©ratoire (<2h versus ≥6h ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique prĂ©opĂ©ratoire (<25 kcal/kg/j versus sans apport ; p= 0,041 et apport protĂ©ique <1 g/kg/j versus sans apport ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique postopĂ©ratoire ([25- 30 Kcal/kg/j versus <25 Kcal/kg/j ; p<0,001 et apport protĂ©ique [1- 1,5 g/kg/j versus <1 g/kg/j ; p<0,001) et la durĂ©e d’hospitalisation (10j versus 14j ; p<0,001) Ă©taient diffĂ©rents entre les deux centres hospitaliers. Le grade nutritionnel (GN 2, p= 0,244) et la morbi-mortalitĂ© Ă©taient comparables entre les deux centres hospitaliers (absence de complications, p= 0,817). Conclusion :L’état nutritionnel pĂ©riopĂ©ratoire constitue l’un des dĂ©terminants d’une rĂ©habilitation postopĂ©ratoire optimale. La prescription du support nutritionnel et du jeĂ»ne prĂ©opĂ©ratoire devrait ĂŞtre en fonction du grade nutritionnel et doit couvrir les besoins nutritionnels quotidiens.  A Soissons (France), mais aussi Ă  Tanambao (Madagascar), cette prise en charge nutritionnelle reste Ă  amĂ©liorer suivant les recommandations.   Background: The nutritional state of a patient impacts on perioperative morbidity and mortality. Postoperative complications are up to 72% in patients with perioperative undernutrition against 29% against those who do not present undernutrition. The mortality rate in perioperative digestive surgery in malnourished subjects is up to 29%. Aim: To compare the modalities of perioperative nutritional management of digestive surgery in the hospitals of Soissons and Tanambao. Patients and methods: This is a prospective observational study over 12 months (May 2018 to April 2019). Patients undergoing digestive surgery via midline laparotomy were included. The Mann Whitney test was used to compare variables relating to the characteristics of the study population, perioperative nutritional management and length of hospital stay (XLSTAT® 2019.4.2). A p- value of less than 0,05 was considered significant. Results: Forty- seven patients aged 63 [32- 100] years old were retained in Soissons while the study population was 43 (aged 45 [18- 79] years old) in Tanambao. The study population was mostly male (sex ratio = 1,5 in Soissons and 2,1 in Toliara). The duration of the preoperative fast (<2h versus ≥6h ; p<0,001), the preoperative protein-energy intake (<25 kcal/kg/day versus no intake ; p= 0,041 and energy intake <1 g/kg/day versus no intake ; p<0,001), the postoperative protein-energy intake ([25- 30 kcal/kg/day versus <25 kcal/kg/day ; p<0,001 and and energy intake [1- 1,5  g/kg/day versus <1 g/kg/day ; p<0,001), and length of hospitalization (10 days versus 14 days ; p<0,001) were different between the two hospitals. The nutritional grade (NG 2, p= 0,244) and morbidity and mortality were comparable between the two groups (absence of complications, p= 0,817). Conclusion: Perioperative nutritional status is one of the elements of good postoperative rehabilitation. The prescription of nutritional support and preoperative fasting should be according to nutritional grade and should cover daily nutritional needs

    Étude Comparative des Modalités de la Price en Charge Périopératore Nutritionnelle Lors de la Chirurgie Digestive à Soissons (France) et à Tanambao (Madagascar)

    Get PDF
    L’état nutritionnel d’un individu influence sur sa morbi-mortalitĂ© pĂ©riopĂ©ratoire. Les complications postopĂ©ratoires sont en augmentation jusqu’à 72% chez les patients prĂ©sentant une dĂ©nutrition en pĂ©riopĂ©ratoire contre 29% chez ceux qui ne le sont pas. Le taux de mortalitĂ© en pĂ©riopĂ©ratoire de chirurgie digestive chez les sujets dĂ©nutris va jusqu’à 29%.  Objectif : Comparer les modalitĂ©s de prise en charge nutritionnelle pĂ©riopĂ©ratoire de chirurgie digestive dans les centres hospitaliers de Soissons (France) et de Tanambao (Madagascar). Patients et mĂ©thode : Il s’agit d’une Ă©tude observationnelle prospective sur douze mois (mai 2018 Ă  avril 2019). Les patients bĂ©nĂ©ficiant d’une chirurgie digestive par voie laparotomie mĂ©diane ont Ă©tĂ© inclus. Le test de Mann Whitney Ă©tait utilisĂ© pour la comparaison des variables portant sur les caractĂ©ristiques de la population d’étude, la prise en charge nutritionnelle pĂ©riopĂ©ratoire et la durĂ©e d’hospitalisation (XLSTAT® 2019.4.2). Une valeur de p infĂ©rieur Ă  0,05 Ă©tait significative.  RĂ©sultats : Quarante-sept patients âgĂ©s de 63 [32- 100] ans ont Ă©tĂ© retenus Ă  Soissons et 43 patients, âgĂ©s de 45 [18- 79] ans, Ă  Tanambao. La population d’étude Ă©tait Ă  prĂ©dominance masculine (sex ratio = 1,5 Ă  Soissons et 2,1 Ă  Toliara). La durĂ©e du jeĂ»ne prĂ©opĂ©ratoire (<2h versus ≥6h ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique prĂ©opĂ©ratoire (<25 kcal/kg/j versus sans apport ; p= 0,041 et apport protĂ©ique <1 g/kg/j versus sans apport ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique postopĂ©ratoire ([25- 30 Kcal/kg/j versus <25 Kcal/kg/j ; p<0,001 et apport protĂ©ique [1- 1,5 g/kg/j versus <1 g/kg/j ; p<0,001) et la durĂ©e d’hospitalisation (10j versus 14j ; p<0,001) Ă©taient diffĂ©rents entre les deux centres hospitaliers. Le grade nutritionnel (GN 2, p= 0,244) et la morbi-mortalitĂ© Ă©taient comparables entre les deux centres hospitaliers (absence de complications, p= 0,817). Conclusion : L’état nutritionnel pĂ©riopĂ©ratoire constitue l’un des dĂ©terminants d’une rĂ©habilitation postopĂ©ratoire optimale. La prescription du support nutritionnel et du jeĂ»ne prĂ©opĂ©ratoire devrait ĂŞtre en fonction du grade nutritionnel et doit couvrir les besoins nutritionnels quotidiens.  A Soissons (France), mais aussi Ă  Tanambao (Madagascar), cette prise en charge nutritionnelle reste Ă  amĂ©liorer suivant les recommandations. L’état nutritionnel d’un individu influence sur sa morbi-mortalitĂ© pĂ©riopĂ©ratoire. Les complications postopĂ©ratoires sont en augmentation jusqu’à 72% chez les patients prĂ©sentant une dĂ©nutrition en pĂ©riopĂ©ratoire contre 29% chez ceux qui ne le sont pas. Le taux de mortalitĂ© en pĂ©riopĂ©ratoire de chirurgie digestive chez les sujets dĂ©nutris va jusqu’à 29%.   Objectif : Comparer les modalitĂ©s de prise en charge nutritionnelle pĂ©riopĂ©ratoire de chirurgie digestive dans les centres hospitaliers de Soissons (France) et de Tanambao (Madagascar). Patients et mĂ©thode : Il s’agit d’une Ă©tude observationnelle prospective sur douze mois (mai 2018 Ă  avril 2019). Les patients bĂ©nĂ©ficiant d’une chirurgie digestive par voie laparotomie mĂ©diane ont Ă©tĂ© inclus. Le test de Mann Whitney Ă©tait utilisĂ© pour la comparaison des variables portant sur les caractĂ©ristiques de la population d’étude, la prise en charge nutritionnelle pĂ©riopĂ©ratoire et la durĂ©e d’hospitalisation (XLSTAT® 2019.4.2). Une valeur de p infĂ©rieur Ă  0,05 Ă©tait significative.  RĂ©sultats : Quarante-sept patients âgĂ©s de 63 [32- 100] ans ont Ă©tĂ© retenus Ă  Soissons et 43 patients, âgĂ©s de 45 [18- 79] ans, Ă  Tanambao. La population d’étude Ă©tait Ă  prĂ©dominance masculine (sex ratio = 1,5 Ă  Soissons et 2,1 Ă  Toliara). La durĂ©e du jeĂ»ne prĂ©opĂ©ratoire (<2h versus ≥6h ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique prĂ©opĂ©ratoire (<25 kcal/kg/j versus sans apport ; p= 0,041 et apport protĂ©ique <1 g/kg/j versus sans apport ; p<0,001), l’apport protĂ©ino-Ă©nergĂ©tique postopĂ©ratoire ([25- 30 Kcal/kg/j versus <25 Kcal/kg/j ; p<0,001 et apport protĂ©ique [1- 1,5 g/kg/j versus <1 g/kg/j ; p<0,001) et la durĂ©e d’hospitalisation (10j versus 14j ; p<0,001) Ă©taient diffĂ©rents entre les deux centres hospitaliers. Le grade nutritionnel (GN 2, p= 0,244) et la morbi-mortalitĂ© Ă©taient comparables entre les deux centres hospitaliers (absence de complications, p= 0,817). Conclusion :L’état nutritionnel pĂ©riopĂ©ratoire constitue l’un des dĂ©terminants d’une rĂ©habilitation postopĂ©ratoire optimale. La prescription du support nutritionnel et du jeĂ»ne prĂ©opĂ©ratoire devrait ĂŞtre en fonction du grade nutritionnel et doit couvrir les besoins nutritionnels quotidiens.  A Soissons (France), mais aussi Ă  Tanambao (Madagascar), cette prise en charge nutritionnelle reste Ă  amĂ©liorer suivant les recommandations.   Background: The nutritional state of a patient impacts on perioperative morbidity and mortality. Postoperative complications are up to 72% in patients with perioperative undernutrition against 29% against those who do not present undernutrition. The mortality rate in perioperative digestive surgery in malnourished subjects is up to 29%. Aim: To compare the modalities of perioperative nutritional management of digestive surgery in the hospitals of Soissons and Tanambao. Patients and methods: This is a prospective observational study over 12 months (May 2018 to April 2019). Patients undergoing digestive surgery via midline laparotomy were included. The Mann Whitney test was used to compare variables relating to the characteristics of the study population, perioperative nutritional management and length of hospital stay (XLSTAT® 2019.4.2). A p- value of less than 0,05 was considered significant. Results: Forty- seven patients aged 63 [32- 100] years old were retained in Soissons while the study population was 43 (aged 45 [18- 79] years old) in Tanambao. The study population was mostly male (sex ratio = 1,5 in Soissons and 2,1 in Toliara). The duration of the preoperative fast (<2h versus ≥6h ; p<0,001), the preoperative protein-energy intake (<25 kcal/kg/day versus no intake ; p= 0,041 and energy intake <1 g/kg/day versus no intake ; p<0,001), the postoperative protein-energy intake ([25- 30 kcal/kg/day versus <25 kcal/kg/day ; p<0,001 and and energy intake [1- 1,5  g/kg/day versus <1 g/kg/day ; p<0,001), and length of hospitalization (10 days versus 14 days ; p<0,001) were different between the two hospitals. The nutritional grade (NG 2, p= 0,244) and morbidity and mortality were comparable between the two groups (absence of complications, p= 0,817). Conclusion: Perioperative nutritional status is one of the elements of good postoperative rehabilitation. The prescription of nutritional support and preoperative fasting should be according to nutritional grade and should cover daily nutritional needs
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