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  1. Article ; Online: Soft Sensing of LPG Processes Using Deep Learning.

    Sifakis, Nikolaos / Sarantinoudis, Nikolaos / Tsinarakis, George / Politis, Christos / Arampatzis, George

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 18

    Abstract: This study investigates the integration of soft sensors and deep learning in the oil-refinery industry to improve monitoring efficiency and predictive accuracy in complex industrial processes, particularly de-ethanization and debutanization. Soft sensor ... ...

    Abstract This study investigates the integration of soft sensors and deep learning in the oil-refinery industry to improve monitoring efficiency and predictive accuracy in complex industrial processes, particularly de-ethanization and debutanization. Soft sensor models were developed to estimate critical variables such as the C2 and C5 contents in liquefied petroleum gas (LPG) after distillation and the energy consumption of distillation columns. The refinery's LPG purification process relies on periodic sampling and laboratory analysis to maintain product specifications. The models were tested using data from actual refinery operations, addressing challenges such as scalability and handling dirty data. Two deep learning models, an artificial neural network (ANN) soft sensor model and an ensemble random forest regressor (RFR) model, were developed. This study emphasizes model interpretability and the potential for real-time updating or online learning. The study also proposes a comprehensive, iterative solution for predicting and optimizing component concentrations within a dual-column distillation system, highlighting its high applicability and potential for replication in similar industrial scenarios.
    Language English
    Publishing date 2023-09-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23187858
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Development and Potential of a Digital out of Home Food Environment Monitoring Platform.

    Hetz, Kathrin / Weerasinghe, Nuwan / Rippin, Holly / Wickramasinghe, Kremlin / Zhiteneva, Olga / Usman, Muhammad Arslan / Politis, Christos / Galea, Gauden

    Nutrients

    2023  Volume 15, Issue 18

    Abstract: The rapidly growing field of digital meal delivery platforms has transformed the out of home (OOH) food environment, presenting both opportunities and challenges for public health. This paper introduces the development and potential of a novel digital ... ...

    Abstract The rapidly growing field of digital meal delivery platforms has transformed the out of home (OOH) food environment, presenting both opportunities and challenges for public health. This paper introduces the development and potential of a novel digital platform designed for monitoring the OOH food environment. Drawing on publicly available data from meal delivery applications, this platform provides valuable insights into the landscape of digital food offerings, such as the most common restaurants per region, average caloric content per meal type, and energy value per monetary unit. This research addresses the current void in regulations for this digital environment, particularly around food labeling and provision of nutrition information. Even though the platform has significantly improved our understanding of the digital food ecosystem, it highlights gaps, primarily due to the lack of publicly available individual data and inconsistencies in provided information. Despite these challenges, the proposed digital platform holds considerable promise for better understanding the digital food environment, supporting healthier food choices, and informing future policy interventions aimed at regulating the online food environment. This research advocates for mandatory regulations in the digital food sector to ensure comprehensive, comparable, and transparent nutrition information and equality in access to nutritious foods.
    MeSH term(s) Ecosystem ; Meals ; Nutritional Status ; Food Labeling ; Health Status
    Language English
    Publishing date 2023-09-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2518386-2
    ISSN 2072-6643 ; 2072-6643
    ISSN (online) 2072-6643
    ISSN 2072-6643
    DOI 10.3390/nu15183887
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Book ; Online: Adaptive and Secure Routing Protocol for Emergency Mobile Ad Hoc Networks

    Panaousis, Emmanouil A. / Ramrekha, Tipu A. / Millar, Grant P. / Politis, Christos

    2010  

    Abstract: The nature of Mobile Ad hoc NETworks (MANETs) makes them suitable to be utilized in the context of an extreme emergency for all involved rescue teams. We use the term emergency MANETs (eMANETs) in order to describe next generation IP-based networks, ... ...

    Abstract The nature of Mobile Ad hoc NETworks (MANETs) makes them suitable to be utilized in the context of an extreme emergency for all involved rescue teams. We use the term emergency MANETs (eMANETs) in order to describe next generation IP-based networks, which are deployed in emergency cases such as forest fires and terrorist attacks. The main goal within the realm of eMANETs is to provide emergency workers with intelligent devices such as smart phones and PDAs. This technology allows communication "islets" to be established between the members of the same or different emergency teams (policemen, firemen, paramedics). In this article, we discuss an adaptive and secure routing protocol developed for the purposes of eMANETs. We evaluate the performance of the protocol by comparing it with other widely used routing protocols for MANETs. We finally show that the overhead introduced due to security considerations is affordable to support secure ad-hoc communications among lightweight devices.

    Comment: 17 Pages, IJWMN
    Keywords Computer Science - Networking and Internet Architecture
    Subject code 000
    Publishing date 2010-05-11
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Laparoscopic retroperitoneal lymph node dissection in the management of testis cancer.

    Correa, José J / Politis, Christos / Rodriguez, Alejandro R / Pow-Sang, Julio M

    Cancer control : journal of the Moffitt Cancer Center

    2007  Volume 14, Issue 3, Page(s) 258–264

    Abstract: Background: The surgical approach to management of testis cancer has been traditionally through an open incision, but in the last decade, several centers have reported their experience with laparoscopic retroperitoneal lymph node dissection (LRPLND).: ...

    Abstract Background: The surgical approach to management of testis cancer has been traditionally through an open incision, but in the last decade, several centers have reported their experience with laparoscopic retroperitoneal lymph node dissection (LRPLND).
    Methods: We reviewed the English literature, summarized the outcomes, and included our initial experience with the LRPLND procedure.
    Results: Improvements in operative time, complications, and morbidity have occurred as surgical experience has increased. The procedure is more challenging in postchemotherapy patients. Outcomes at our institute are comparable to reported series from other institutions, and LRPLND is our current procedure of choice for RPLND.
    Conclusions: LRPLND has been shown to be a safe, effective, minimally invasive procedure in the management of testicular cancer patients who require surgery to address the retroperitoneal lymph nodes.
    MeSH term(s) Humans ; Laparoscopy/methods ; Lymph Node Excision/methods ; Male ; Minimally Invasive Surgical Procedures ; Retroperitoneal Space/surgery ; Testicular Neoplasms/surgery ; Treatment Outcome
    Language English
    Publishing date 2007-07
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1328503-8
    ISSN 1526-2359 ; 1073-2748
    ISSN (online) 1526-2359
    ISSN 1073-2748
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4467: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article ; Online: Bladder cancer: a review of non-muscle invasive disease.

    Sexton, Wade J / Wiegand, Lucas R / Correa, José J / Politis, Christos / Dickinson, Shohreh Iravani / Kang, Loveleen C

    Cancer control : journal of the Moffitt Cancer Center

    2010  Volume 17, Issue 4, Page(s) 256–268

    Abstract: Background: Bladder cancer is one of the most common cancers affecting men and women and thus has a profound impact on health care. The majority of patients (75%) with newly diagnosed urothelial tumors have non-muscle invasive disease confined to the ... ...

    Abstract Background: Bladder cancer is one of the most common cancers affecting men and women and thus has a profound impact on health care. The majority of patients (75%) with newly diagnosed urothelial tumors have non-muscle invasive disease confined to the bladder mucosa or the lamina propria.
    Methods: The authors review the literature as well as recently published clinical guidelines regarding the bladder cancer risk and causative factors, diagnostic and pathologic evaluation, prognostic variables, and management strategies for patients with non-muscle invasive bladder cancer.
    Results: Recurrence and progression remain problematic for many patients and are dependent on multiple clinical and pathological features, the most important of which are tumor stage, grade, multifocality, size, recurrence patterns, and the association with carcinoma in situ. Accurate assessment of clinical stage and tumor grade is critical in determining management and surveillance strategies. Intravesical therapies positively influence tumor recurrence rates. Disease progression rates may be impacted in high-risk patients who receive both induction bacille Calmette-Guérin (BCG) and a maintenance BCG regimen. Cystectomy still plays a pivotal role in patients with high-risk tumors and in patients who fail more conservative attempts to eradicate non-muscle invasive disease.
    Conclusions: Non-muscle invasive bladder cancers represent a broad group of tumors with varying biologic potential. Successful treatment depends on the careful integration of diagnostic and surveillance tests, macroablation through transurethral resection, accurate assessment of clinical stage, and the timely and appropriate delivery of intravesical chemotherapeutic and immunomodulatory agents.
    MeSH term(s) Administration, Intravesical ; Antineoplastic Agents/therapeutic use ; Combined Modality Therapy ; Disease Progression ; Humans ; Neoplasm Invasiveness ; Neoplasm Recurrence, Local ; Neoplasm Staging ; Risk Factors ; Urinary Bladder Neoplasms/diagnosis ; Urinary Bladder Neoplasms/pathology ; Urinary Bladder Neoplasms/therapy
    Chemical Substances Antineoplastic Agents
    Language English
    Publishing date 2010-10
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1328503-8
    ISSN 1526-2359 ; 1073-2748
    ISSN (online) 1526-2359
    ISSN 1073-2748
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.A 4467: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  6. Book ; Online: A Testbed Implementation for Securing OLSR in Mobile Ad hoc Networks

    Panaousis, Emmanouil A. / Drew, George / Millar, Grant P. / Ramrekha, Tipu A. / Politis, Christos

    2010  

    Abstract: Contemporary personal computing devices are increasingly required to be portable and mobile enabling user's wireless access, to wired network infrastructures and services. This approach to mobile computing and communication is only appropriate in ... ...

    Abstract Contemporary personal computing devices are increasingly required to be portable and mobile enabling user's wireless access, to wired network infrastructures and services. This approach to mobile computing and communication is only appropriate in situations where a coherent infrastructure is available. There are many situations where these requirements are not fulfilled such as; developing nations, rural areas, natural disasters, and military conflicts to name but a few. A practical solution is to use mobile devices interconnected via a wireless medium to form a network, known as a Mobile Ad-hoc Network (MANET), and provide the services normally found in wired networks. Security in MANETs is an issue of paramount importance due to the wireless nature of the communication links. Additionally due to the lack of central administration security issues are different from conventional networks. For the purposes of this article we have used the "WMN test-bed" to enable secure routing in MANETs. The use of cryptography is an efficient proven way of securing data in communications, but some cryptographic algorithms are not as efficient as others and require more processing power, which is detrimental to MANETs. In this article we have assessed different cryptographic approaches to securing the OLSR (Optimised Link State Routing) protocol to provide a basis for research. We conclude the paper with a series of performance evaluation results regarding different cryptographic and hashing schemes. Our findings clearly show that the most efficient combination of algorithms used for authentication and encryption are SHA-1 and AES respectively. Using this combination over their counterparts will lead to a considerable reduction in processing time and delay on the network, creating an efficient transaction moving towards satisfying resource constraints and security requirements.

    Comment: 20 pages, 13 figures
    Keywords Computer Science - Networking and Internet Architecture
    Subject code 303
    Publishing date 2010-10-24
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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