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- 저자 : Toman (검색결과 4 건)
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Approaches and Devices for Laparoscopic Liver Resections
( Toman Daniel ),( Vavra Petr ),( Ihnat Petr ),( Nowakova Jana ),( Jelinek Petr ),( Hasal Martin ),( Peteja Matus ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: In the last decades, laparoscopic liver surgery underwent a major evolution. Laparoscopic liver resections are now being performed more frequently, even for larger, malignant tumors located in challenging locations. Minimally invasive operations are associated with lower perioperative morbidity with the same oncologic outcomes. Ultrasound guidance is an important tool in the laparoscopic approach, enabling surgeons to target lesions anywhere within the liver, identify size and shape of the lesions. Methods: Minimally invasive approaches include pure laparoscopic, hand-assisted laparoscopic, and a laparoscopicassisted open hybrid approach. For a transection of liver parenchyma there are many possibilities of devices that can be used - CUSA - Cavitron Ultrasonic Surgical Aspirator, Ligasure, Staplers, Harmonic scalpel, Water Jet, Radiofrequency ablation or Bipolar coagulation. Results: Operative blood loss, postoperative morbidity and mortality also like the operative time show comperable results to open resections. Use of the hand-assisted technique may minimise the rate of conversion to open surgery. The benefit of smaller incisions, less pain and scarring is obvious. Conclusions: Laparoscopic liver resection is gaining popularity due to the availability of new laparoscopic instruments for liver transection and it looks as favourable due to fact that no reconstruction is demanded for resection. In the hands of surgical team experts in hepatobiliary and laparoscopic surgery in well selected patients laparoscopic liver resection appears to be safe and to achieve acceptable oncologic outcomes.
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Conformation changes of polysilanes during the polaron formation
P.Toman,S.Ne?p?rek,J.W.Jang,C.E.Lee 한국물리학회 2002 Current Applied Physics Vol.2 No.4
Quantum mechanical studies of polaron formation in oligo[methyl(phenyl)silane] (OMPSi) was performed. The conformationsof the neutral, positively and negatively charged OMPSi were optimized by means of B3LYP method. For the evaluation of thesubstituent eects, the conformation of the unsubstituted oligosilane chain was also calculated. The negative polaron conformationshows a signicant stretching of the chain, whereas the positive polaron conformation is shrunk. This fact is associated with changesof electron density distribution. There is also a strong inuence of thep-conjugated substituent on the conformation of the negativepolaron. On the other hand, the inuence of the substituents on the conformation of the positive polaron is small. The absorptionspectra of the defect-free and polaron oligomers are discussed.. 2002 Elsevier Science B.V. All rights reserved.
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Light-driven molecular current switch
S.Ne?p?rek,P.Toman,J.Sworakowski,J.Lipinski 한국물리학회 2002 Current Applied Physics Vol.2 No.4
A scheme of a light-driven current switch based on properties of a conducting polymer containing photochromic moietieschemically attached to the main chain is put forward. The idea is supported with results of 3D calculations of local states for chargecarriers formed in the vicinity of dipolar species in molecular materials, and with quantum chemical calculations.. 2002 Elsevier Science B.V. All rights reserved.
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