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Combined Endoscopic/Microscopic Cochlear Implantation Through the Oval Window
Cantore Italo 대한청각학회 2022 Journal of Audiology & Otology Vol.26 No.2
Standard round window (RW) cochlear implantation is a well-described technique. Implantation might be difficult in patients with inner and middle ear anomalies, in some cases because of not achieving adequate exposure to the RW, with a related higher risk of complications such as facial nerve injury. It is proposed a combined microscopic/endoscopic oval window approach in a 63 year old man affected by bilateral Menière disease, with bilateral severe sensorineural hearing loss, speech discrimination score for bysillabic words under 40% and a hidden RW by anomalous facial nerve course. All electrodes entered the cochlear with good freefield thresholds and auditory ability results. A partial marginalis nerve palsy occurred at the second postoperative day and completely reversed at 2 months from surgery. Endoscopicassisted oval window cochlear implantation may be a safe alternative surgical technique in cases where surgeons are not able to access RW.
CFD OPTIMIZATION OF A 2-STROKE RANGE EXTENDER ENGINE
E. MATTARELLI,C. A. RINALDINI,G. CANTORE 한국자동차공학회 2015 International journal of automotive technology Vol.16 No.3
A very promising concept for small range extenders (peak power less than 40 kW) is represented by the 2- stroke, direct injection spark ignition engine, with scavenging and exhaust ports controlled by the piston, and an external pump. The most important issue to be addressed on this type of engines is the compliance with stringent rules on pollutant emissions, which depends on combustion patterns and the quality of the scavenging process. The latter is generally hindered by the symmetry of ports timings, but this handicap can be canceled by adopting a patented rotary valve, controlling the flow through a set of auxiliary transfer ports, and using a piston pump for delivering air to the power cylinder and enhancing the balance of the crankshaft. The paper reviews the design of a virtual engine, rated at 35 kW at 5600 rpm, and developed according to the above mentioned concepts. Design has been driven by CFD simulation, using, whenever possible, experimentally calibrated numerical models, or experimental information derived from similar projects. Particular care has been devoted to characterize the scavenging process and the flow patterns within the cylinder and through the ports, analyzing the influence of the rotary induction valve. Engine performance parameters have been predicted by using a well-established commercial software (GT-Power, by Gamma Technologies), while CFD-3D analyses have been carried out by means of a customized version of the KIVA-3V code. The whole study is conceived as the basis for the construction of a physical prototype. The power target has been virtually achieved with a very light and compact engine (estimated weight without the close-coupled electric motor: 35 kg). A three-way catalyst allows the engine to comply with the most stringent emission regulations, without relevant penalizations on fuel efficiency. Furthermore, the engine can work with lean mixtures, achieving a minimum specific fuel consumption comparable to a current automotive Diesel engine (223 g/kWh). This excellent result is due to the low friction and pumping losses of the 2-Stroke engine, as well as to the compactness of the combustion chamber and the capability to stratify the charge.
Francesco Esposito,Adele Noviello,Nicola Moles,Nicola Cantore,Mario Baiamonte,Enrico Coppola Bottazzi,Antonio Miro,Francesco Crafa 한국간담췌외과학회 2018 Annals of hepato-biliary-pancreatic surgery Vol.22 No.2
Backgrounds/Aims: Partial splenectomy (PS) is a surgical option for splenic mass, in order to reduce postoperative complications and preserve the splenic function. Despite this, data in literature is still scarce. The present study aimed to reveal our recent experience and provide a comprehensive overview of the feasibility and complications related to various surgical approaches. Methods: Data of patients who underwent PS, between 2014 and 2017 were retrospectively reviewed. Literature was searched for studies reporting all types of PS in adult or adolescent patients. Results: Five PS were performed in our department: two (40%) by laparoscopy and three (60%) by laparotomy. Two (40%) postoperative complications were detected, and in one of them, total splenectomy (TS) by laparotomy was finally required. There were no deaths or complications at last follow-up. Twenty studies including 213 patients were identified in the literature search. The rate of conversion from laparoscopic to open surgery was 3% (range, 5-50%) and in 3% of cases (range, 7-10%) PS was converted into total TS and the overall morbidity rate was 8% (range, 5-25%). In comparison to laparotomy, the conversion rate of laparoscopic approach to TS was 3.5% (vs. 1.4%) and a morbidity rate of 9.8% (vs. 4.3%). Conclusions: The present review shows that PS is a viable procedure in selected cases. The mini-invasive approach seemed to be feasible despite the presence of higher rate of complications than the open technique. In future, further studies on this topic are needed by involving more patients. Furthermore, it is proposed that the development of robotic surgery could make this approach the new gold-standard technique for spleen-preserving surgery.
Alessia Chini,Michele Manigrasso,Grazia Cantore,Rosa Maione,Marco Milone,Francesco Maione,Giovanni Domenico De Palma 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.2
Colorectal cancer is an important cause of morbidity and mortality worldwide. Optical colonoscopy (OC) is widely accepted as thereference standard for the screening of colorectal polyps and cancers, and computed tomography colonography (CTC) is a validalternative to OC. The purpose of this review was to assess the diagnostic accuracy of OC and CTC for colorectal lesions. A literaturesearch was performed in PubMed, Embase, and Cochrane Library, and 18 articles were included. CTC has emerged in recent years asa potential screening examination with high accuracy for the detection of colorectal lesions. However, the clinical application of CTCas a screening technique is limited because it is highly dependent on the size of the lesions and has poor performance in detectingindividual lesions <5 mm or flat lesions, which, although rarely, can have a malignant potential.
급냉응고시킨 Al-Li 합금에서 준결정상의 형성에 관한 연구
이호인,김도향,Cantor,B. 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.9
The formation of quasicrsatals in rapidly solidified Al-Li alloys have been investigated by detailed transmission electron microscopy, including a combination of bright and dark field imaging, selected area diffraction pattern analysis and energy dispersive X-ray microanalysis. Al-Cu-Li, Al-Cu-Li-Mg and 2024-2Li alloys rapidly solidified by melt spinning consist of various types of solidification microstructure, ranging form a fine columnar grain structure near the chilled ,surface to a coarse cellular structure near the unchilled surface, depending upon the wheel rotation speed during melt spinning and the local cooling rate through the thickness of the ribbon. Fine scale δ' precipitates during melt spinning in Al-Cu-Li, Al-Cu-Li-Mg and 2024-2Li alloys. The intercellular particles in as-melt spun Al-Cu-Li alloys are the T_8, Θ or T_2 icosahedral phases, depending upon the alloy composition, but in as-melt spun Al-Cu-Li-Mg and 2024-2Li alloys are always the icosahedral phase. Addition of Mg is effective in stabilizing the icosahedral phase in Al- Cu-Li alloys. The icosahedral phase forms as a second solidification product and is located at primary α-Al cell or dendrite boundaries, with strong dependence of icosahedral particle size upon the melt spinning wheel speed and local cooling rate. The composition of the icosahedral phase in rapidly solidified Al-Li alloys is not stoichiometric. Thus, the composition of the icosahedral phase in as-rapidly solidified Al-Cu-Li-Mg and 2024-2Li alloys can be expressed as (Al, Si)_6 (Cu, Fe, Mn)(Li, Mg)₃, assuming Si, Mg and (Mn, Fe) replacing Al, Li and Cu respectively in the Al_6CuLi₃ icosahedral structure.
용탕단조법으로 제조한 2024/20% SiC 휘스커 복합재의 미세 구조 및 열처리 거동에 대한 연구
이호인,오규환,Cantor, B 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.8
Microstruture of squeeze cast 2024/20% SiC whisker composite was studied using transmission electron microscopy with energy dispersive spectrometry. Microstructure was oberserved at as-cast, solution treated. In as-cast condition, S', θ', S phase was observed in the matrix and at the interface Al_(15)(Fe, Mn)₃Si₂, θ, S phase was observed. After solution treatment, previous phase in the matrix were dissolved and Al_(20)Cu₂Mn₃ shape precipitate was observed in the matrix. Al_(15)(Fe, Mn)₃Si₂ phase which was formed in the casting stage was unchanged and Al_(20)Cu₂Mn₃ precipitate was observed at the interface.