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1
Experimental verification of the linear and non-linear versions of a panel code

Grigoropoulos, G.J.,Katsikis, C.,Chalkias, D.S. The Society of Naval Architects of Korea 2011 International Journal of Naval Architecture and Oc Vol.3 No.1
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In the proposed paper numerical calculations are carried out using two versions of a three-dimensional, timedomain panel method developed by the group of Prof. P. Sclavounos at MIT, i.e. the linear code SWAN2, enabling optionally the use of the instantaneous non-linear Froude-Krylov and hydrostatic forces and the fully non-linear SWAN4. The analytical results are compared with experimental results for three hull forms with increasing geometrical complexity, the Series 60, a reefer vessel with stern bulb and a modern fast ROPAX hull form with hollow bottom in the stern region. The details of the geometrical modeling of the hull forms are discussed. In addition, since SWAN4 does not support transom sterns, only the two versions of SWAN2 were evaluated over experimental results for the parent hull form of the NTUA double-chine, wide-transom, high-speed monohull series. The effect of speed on the numerical predictions was investigated. It is concluded that both versions of SWAN2 the linear and the one with the non-linear Froude-Krylov and hydrostatic forces provide a more robust tool for prediction of the dynamic response of the vessels than the non-linear SWAN4 code. In general, their results are close to what was expected on the basis of experience. Furthermore, the use of the option of non-linear Froude-Krylov and hydrostatic forces is beneficial for the accuracy of the predictions. The content of the paper is based on the Diploma thesis of the second author, supervised by the first one and further refined by the third one.
2
Experimental verification of the linear and non-linear versions of a panel code

G.J. Grigoropoulos,C. Katsikis,D.S. Chalkias 대한조선학회 2011 International Journal of Naval Architecture and Oc Vol.3 No.1
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  DBpia
  
  KCI
In the proposed paper numerical calculations are carried out using two versions of a three-dimensional, timedomain panel method developed by the group of Prof. P. Sclavounos at MIT, i.e. the linear code SWAN2, enabling optionally the use of the instantaneous non-linear Froude-Krylov and hydrostatic forces and the fully non-linear SWAN4. The analytical results are compared with experimental results for three hull forms with increasing geometrical complexity, the Series 60, a reefer vessel with stern bulb and a modern fast ROPAX hull form with hollow bottom in the stern region. The details of the geometrical modeling of the hull forms are discussed. In addition, since SWAN4 does not support transom sterns, only the two versions of SWAN2 were evaluated over experimental results for the parent hull form of the NTUA double-chine, wide-transom, high-speed monohull series. The effect of speed on the numerical predictions was investigated. It is concluded that both versions of SWAN2 the linear and the one with the non-linear Froude-Krylov and hydrostatic forces provide a more robust tool for prediction of the dynamic response of the vessels than the non-linear SWAN4 code. In general, their results are close to what was expected on the basis of experience. Furthermore, the use of the option of non-linear Froude-Krylov and hydrostatic forces is beneficial for the accuracy of the predictions. The content of the paper is based on the Diploma thesis of the second author, supervised by the first one and further refined by the third one.
3
Undifferentiated embryonal sarcoma of the liver in a young female

Dimitrios E. Giakoustidis,Athanasios A. Gargavans,Evangelia D. Katsiki,Nikolaos T. Salveridis,Nikolaos A. Antoniadis,Vasileios Papanikolaou 한국간담췌외과학회 2016 한국간담췌외과학회지 Vol.20 No.3
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Undifferentiated Embryonal Sarcoma of the Liver (UESL) is a tumor highly malignant, of mesenchymal origin. It is a rare finding in adults, though less rare in children. The strategy to be followed and the therapeutic targets to be reached for this tumor, in adult cases, remain ambiguous and controversial. Herein we report the case of a 29 year old female patient with a massive UESL and we describe our therapeutic approach. A 29 year-old female patient was referred to our center with severe intermittent epigastric pain and fever due to a voluminous liver tumor: Needle biopsy was of no specific findings and surgical excision was decided. Right portal vein embolization and selective embolization of the segment’s IV branch was performed in order to achieve adequate future liver remnant (FLR). Right trisectonectomy was then performed, with uneventful post operative period and the patient was discharged at the 11<SUP>th</SUP> post operative day. UESL is a rare tumor that needs aggressive surgical approach and multidisciplinary team management is of paramount importance.