1,720,962 research outputs found
Simulasi Pengaruh Penambahan CP pada Modulasi OFDM di Spesifikasi 802.11a/g yang Melewati Kanal Multipath
Full text linkWifi digunakan dimana-mana, baik di dalam gedung maupun di luar ruangan. Ketika di dalam gedung, sinyal wifi akan mengalami beberapa pantulan maupun penyerapan yang disebabkan oleh dinding maupun interior. Standar Wifi menambahkan Cyclic Prefix (CP) untuk mengatasi Multipath. Penelitian ini berusaha untuk melihat pengaruh multipath pada standar wifi 802.11a/g, yang menggunakan OFDM. Model multipath yang dipakai adalah kanal a, b, dan c dari Proakis. Hasil yang diperoleh adalah penambahan CP pada sinyal OFDM dapat mengatasi multipath pada kanal a dan b. Namun pada kanal c, gagal. Ada beberapa simbol yang keluar dari konstelasinya
Study and design of a new PHY/MAC Cross-Layer architecture for Wireless Sensor Networks Dedicated to Healthcare
No full textL’amélioration de l’accès et de la qualité des services de santé publique en Indonésie restent un grand défi. Les obstacles géographiques, la pénurie et la mauvaise répartition des spécialistes/médecins, en particulier dans les zones rurales, sont quelques-uns des défis à relever. En 2016, l’Indonésie a développé un système de télémédecine appelé "soins à domicile" pour surmonter ces défis. Ils ont créé un véhicule de santé mobile appelé "Dottoro ta" qui offre des services de santé 24 heures/jour à la communauté. Ce véhicule est équipé d’Electro- Cardio-Graphy (ECG), d’Ultra-Sono-Graphy (USG) et d’autres équipements médicaux standards. Lorsque les patients font appel à ce service, une équipe composée de médecins, d’infirmières et de chauffeurs se déplace vers l’emplacement du patient et lui prodigue un traitement approprié. Parallèlement, le développement des technologies de l’Internet des objets (IoT) offre une large opportunité d’améliorer ces services. L’IoT est un ensemble de dispositifs ou de capteurs connectés à Internet. Ici, Internet n’a pas besoin d’être une connexion globale; en effet, un réseau local (LAN) est également possible tant qu’il prend en charge les protocoles TCP/IP. La plupart des appareils IoT utilisent des connexions sans fil pour assurer la mobilité et la portabilité. Cependant, les dispositifs sans fil présentent des problèmes fondamentaux comme la consommation d’énergie, le bruit et les interférences des communications sans fil. L’IoT présente de nombreuses variantes de mise en oeuvre, notamment dans les secteurs de la santé. Aujourd’hui, les noeuds de capteurs se sont transformés en petits appareils discrets et puissants, qui peuvent être facilement intégrés dans des appareils portables tels que des montres intelligentes, des bracelets, des gants ou des boutons. Ainsi, l’IoT offre un moyen plus pratique de recueillir les données sur l’état de santé des patients à l’aide de capteurs portables, puis d’envoyer, d’analyser et de stocker les données dans le nuage. L’utilisation de l’IoT dans les secteurs de la santé est le domaine de la télémédecine, permet aux médecins et aux infirmières de récupérer des données en temps réel et d’effectuer immédiatement des diagnostics sur place, sans se préoccuper de l’installation. Cette démarche permet d’accélérer le diagnostic et aura un impact positif sur la santé du patient. En effet, le déploiement du système IoT dans le secteur de la santé présente plusieurs avantages par rapport aux systèmes filaires classiques, tels que la facilité d’utilisation, la réduction du risque d’infection, la réduction du risque d’échec, la réduction de l’inconfort des utilisateurs, l’augmentation de la mobilité, l’amélioration de l’efficacité des soins hospitaliers, et réduire les coûts d’installation. Cependant, fournir une transmission robuste sans fil est un défi dans le domaine de la santé, parce que les données de santé mises à jour en continu sont très importantes pour le traitement des patients. [....] etc.Improving access and quality of public health services in Indonesia is still a big challenge. Geographic obstacles, shortage, and maldistribution of specialist/doctors especially in rural areas are some of the challenges to be answered. In 2016, the city council of Makassar Indonesia has developed a telemedicine system called "home care" to overcome those challenges. They created mobile healthcare vehicle called "Dottoro ta" that gives healthcare services 24 hours/day to the community. This vehicle is equipped with ElectroCardioGraphy (ECG), UltraSonoGraphy (USG) and other standard medical equipment. When patients call this service, a team consisting of doctors, nurses and drivers will move to the patient's location and gives a proper treatment. Meanwhile, the development of Internet of Things (IoT) technologies offers a broad opportunity to improve these services. Changing this equipment with IoT devices will offer a lot of advantages. IoT is the recent technological term, which is a collection of devices or sensors that have connectivity to the internet. Here, the Internet does not have to be a global connection; indeed, a Local Area Network (LAN) is also possible as long as it supports TCP/IP protocols. Most IoT devices use wireless connections to ensure mobility and portability. However, wireless devices have some fundamental issues such as energy consumption, noise and interference of wireless communication. IoT has many variations for implementation including healthcare sectors. Today, sensor nodes have changed into small, unobtrusive and powerful devices, which can be easily accommodated into wearable devices such as smart watches, bracelets, gloves or buttons. Thus, it gives more convenient way to collect the health condition data of patients using wearable sensors and then send, analyzed and stored the data in the cloud. For example, by using heart rate sensors, the conditions of the patients such as heart attacks, anxiety and stress can be continuously monitored. Another potential of using IoT on health sectors is telemedicine field, enabling doctors/nurses to perform retrieval of data in real-time and immediately perform diagnostics on the spot, without preoccupied with the installation of conventional medical devices. This will speed up diagnosis and give a positive impact on the health of the patient. Indeed, deploying IoT system in the health sector has several advantages over conventional wired systems such as ease of use, reducing the risk of infection, reducing the risk of failure, reducing user discomfort, increasing mobility, improving the efficiency of hospital care, and lower installation costs. However, providing the robust transmission in the wireless communication is a challenge in the healthcare domain, because continuous updated health data is very important for the treatment of the patients. In this research activity, we propose a new cross layer protocol to overcome this problem. The proposal takes advantages of beacon power measurements in the node’s PHY layer to determine whether there is interference from the human body or not. This information is used by the MAC layer to decide the transmission of packets. Our results show that there are significant improvements of the PER while maintaining the throughput relatively the same as the conventional protocol. We analytically show the effect of body pathloss on 802.11ah network and its effects in terms of power consumption for the healthcare sensors. We compare the standard pathloss of 802.11ah with body pathloss. We see that body pathloss increase PER and decrease throughput because the body absorbs the electromagnetic signal. We also propose a novel cross-layer algorithm to counter the effect of body pathloss. The idea is to defer the data transmission if there is a high probability of body pathloss by detecting the received power of beacon
Integrasi Jaringan Telepon Analog dengan Jaringan Komputer di Politeknik Negeri Batam
Full text linkSaat ini TCP/IP secara de facto sudah menjadi standar jaringan telekomunikasi di dunia. Politeknik Batam juga menggunakan TCP/IP untuk jaringan data. Untuk kebutuhan suara (voice), Politeknik Batam menggunakan jaringan telekomunikasi yang berbeda. Memelihara dua jaringan yang berbeda, mau tidak mau pasti menambah biaya pemeliharaan. Sehingga kita harus mulai menggabungkan dua jaringan ini (voice dan data). Komunikasi voice, data dan video menjadi satu. Apalagi, dalam beberapa tahun mendatang Politeknik Batam akan melakukan pembangunan gedung baru, yang berarti instalasi jaringan baru. Oleh karena itu, network convergence sangat diperlukan. Penelitian ini berhasil menggabungkan dua jaringan tersebut dengan memanfaatkan voice card yang dipasang di server Asterisk. Jaringan komputer Politeknik Negeri Batam dan jaringan PABX dapat saling berkomunikasi. Kualitas percakapan yang diperoleh masih dapat dipahami dengan delay rata-rata di bawah 30 ms, jitter rata-rata di bawah 10 ms dan packet loss rata-rata di bawah 1%
Etude et conception d'une nouvelle architecture transversale PHY/MAC pour les réseaux de capteurs sans fils dédiés à la télémédecine
No full textImproving access and quality of public health services in Indonesia is still a big challenge. Geographic obstacles, shortage, and maldistribution of specialist/doctors especially in rural areas are some of the challenges to be answered. In 2016, the city council of Makassar Indonesia has developed a telemedicine system called "home care" to overcome those challenges. They created mobile healthcare vehicle called "Dottoro ta" that gives healthcare services 24 hours/day to the community. This vehicle is equipped with ElectroCardioGraphy (ECG), UltraSonoGraphy (USG) and other standard medical equipment. When patients call this service, a team consisting of doctors, nurses and drivers will move to the patient's location and gives a proper treatment. Meanwhile, the development of Internet of Things (IoT) technologies offers a broad opportunity to improve these services. Changing this equipment with IoT devices will offer a lot of advantages. IoT is the recent technological term, which is a collection of devices or sensors that have connectivity to the internet. Here, the Internet does not have to be a global connection; indeed, a Local Area Network (LAN) is also possible as long as it supports TCP/IP protocols. Most IoT devices use wireless connections to ensure mobility and portability. However, wireless devices have some fundamental issues such as energy consumption, noise and interference of wireless communication. IoT has many variations for implementation including healthcare sectors. Today, sensor nodes have changed into small, unobtrusive and powerful devices, which can be easily accommodated into wearable devices such as smart watches, bracelets, gloves or buttons. Thus, it gives more convenient way to collect the health condition data of patients using wearable sensors and then send, analyzed and stored the data in the cloud. For example, by using heart rate sensors, the conditions of the patients such as heart attacks, anxiety and stress can be continuously monitored. Another potential of using IoT on health sectors is telemedicine field, enabling doctors/nurses to perform retrieval of data in real-time and immediately perform diagnostics on the spot, without preoccupied with the installation of conventional medical devices. This will speed up diagnosis and give a positive impact on the health of the patient. Indeed, deploying IoT system in the health sector has several advantages over conventional wired systems such as ease of use, reducing the risk of infection, reducing the risk of failure, reducing user discomfort, increasing mobility, improving the efficiency of hospital care, and lower installation costs. However, providing the robust transmission in the wireless communication is a challenge in the healthcare domain, because continuous updated health data is very important for the treatment of the patients. In this research activity, we propose a new cross layer protocol to overcome this problem. The proposal takes advantages of beacon power measurements in the node’s PHY layer to determine whether there is interference from the human body or not. This information is used by the MAC layer to decide the transmission of packets. Our results show that there are significant improvements of the PER while maintaining the throughput relatively the same as the conventional protocol. We analytically show the effect of body pathloss on 802.11ah network and its effects in terms of power consumption for the healthcare sensors. We compare the standard pathloss of 802.11ah with body pathloss. We see that body pathloss increase PER and decrease throughput because the body absorbs the electromagnetic signal. We also propose a novel cross-layer algorithm to counter the effect of body pathloss. The idea is to defer the data transmission if there is a high probability of body pathloss by detecting the received power of beacon.L’amélioration de l’accès et de la qualité des services de santé publique en Indonésie restent un grand défi. Les obstacles géographiques, la pénurie et la mauvaise répartition des spécialistes/médecins, en particulier dans les zones rurales, sont quelques-uns des défis à relever. En 2016, l’Indonésie a développé un système de télémédecine appelé "soins à domicile" pour surmonter ces défis. Ils ont créé un véhicule de santé mobile appelé "Dottoro ta" qui offre des services de santé 24 heures/jour à la communauté. Ce véhicule est équipé d’Electro- Cardio-Graphy (ECG), d’Ultra-Sono-Graphy (USG) et d’autres équipements médicaux standards. Lorsque les patients font appel à ce service, une équipe composée de médecins, d’infirmières et de chauffeurs se déplace vers l’emplacement du patient et lui prodigue un traitement approprié. Parallèlement, le développement des technologies de l’Internet des objets (IoT) offre une large opportunité d’améliorer ces services. L’IoT est un ensemble de dispositifs ou de capteurs connectés à Internet. Ici, Internet n’a pas besoin d’être une connexion globale; en effet, un réseau local (LAN) est également possible tant qu’il prend en charge les protocoles TCP/IP. La plupart des appareils IoT utilisent des connexions sans fil pour assurer la mobilité et la portabilité. Cependant, les dispositifs sans fil présentent des problèmes fondamentaux comme la consommation d’énergie, le bruit et les interférences des communications sans fil. L’IoT présente de nombreuses variantes de mise en oeuvre, notamment dans les secteurs de la santé. Aujourd’hui, les noeuds de capteurs se sont transformés en petits appareils discrets et puissants, qui peuvent être facilement intégrés dans des appareils portables tels que des montres intelligentes, des bracelets, des gants ou des boutons. Ainsi, l’IoT offre un moyen plus pratique de recueillir les données sur l’état de santé des patients à l’aide de capteurs portables, puis d’envoyer, d’analyser et de stocker les données dans le nuage. L’utilisation de l’IoT dans les secteurs de la santé est le domaine de la télémédecine, permet aux médecins et aux infirmières de récupérer des données en temps réel et d’effectuer immédiatement des diagnostics sur place, sans se préoccuper de l’installation. Cette démarche permet d’accélérer le diagnostic et aura un impact positif sur la santé du patient. En effet, le déploiement du système IoT dans le secteur de la santé présente plusieurs avantages par rapport aux systèmes filaires classiques, tels que la facilité d’utilisation, la réduction du risque d’infection, la réduction du risque d’échec, la réduction de l’inconfort des utilisateurs, l’augmentation de la mobilité, l’amélioration de l’efficacité des soins hospitaliers, et réduire les coûts d’installation. Cependant, fournir une transmission robuste sans fil est un défi dans le domaine de la santé, parce que les données de santé mises à jour en continu sont très importantes pour le traitement des patients. [....] etc
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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