检索结果-南通市图书馆

Weighted‑indexed semi‑Markov model:calibration and application to financial modeling

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Financial Innovation 2023年第1期9卷 916-931页

作者： riccardo De Blasis Department of Management Marche Polytechnic UniversityAnconaItaly

We address the calibration issues of the weighted-indexed semi-Markov chain(WISMC)model applied to high-frequency financial ***,we propose to automate the discretization of the price returns and the volatility index by using four different approaches,two based on statistical quantities,namely,the quantile and sigma discretization,and two derived by the application of two popular machine learning algorithms,namely the k-means and Gaussian mixture model(GMM).Moreover,by comparing the Bayesian information criterion(BIC)scores,the GMM approach allows for the selection of the number of states of returns and *** application to Bitcoin prices at 1-min and 1-s intervals shows the validity and usefulness of the proposed discretization *** particular,GMM discretization is well suited for highfrequency returns,whereas the quantile approach works better for low-frequency ***,by comparing the results of the Monte Carlo simulation,we show that the WISMC model,applied with the proposed discretization,can reproduce the longrange serial correlation of the squared returns,which is typical of the financial markets and,in particular,the cryptocurrency market.

关键词： Semi-Markov WISMC Bitcoin EWMA k-means GMM

Radiological findings in non-surgical recurrent hepatocellular carcinoma:From locoregional treatments to immunotherapy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第11期29卷 1669-1684页

作者： Davide Ippolito Cesare Maino Marco Gatti Paolo Marra riccardo Faletti Francesco Cortese riccardo Inchingolo Sandro Sironi Department of Radiology IRCCS San Gerardo dei TintoriMonza 20900Italy School of Medicine and Surgery University of Milano-BicoccaMilano 20121Italy Department of Surgical Sciences University of TurinTurin 10126Italy Department of Diagnostic and Interventional Radiology Papa Giovanni ⅩⅩⅢ HospitalBergamo 24127Italy Interventional Radiology Unit “F.Miulli”Regional General HospitalBari 70121Italy

Since hepatocellular carcinoma(HCC)represents an important cause of mortality and morbidity all over the ***,it is fundamental not only to achieve a curative treatment but also to manage in the best way any possible *** if the latest update of the Barcelona Clinic Liver Cancer guidelines for HCC treatment has introduced new locoregional techniques and confirmed others as well-established clinical practices,there is still no consensus about the treatment of recurrent HCC(RHCC).Locoregional treatments and medical therapy represent two of the most widely accepted approaches for disease control,especially in the advanced stage of liver *** medical treatments are now approved,and others are under *** this basis,radiology plays a central role in the diagnosis of RHCC and the assessment of response to locoregional treatments and medical therapy for *** review summarized the actual clinical practice by underlining the importance of the radiological approach both in the diagnosis and treatment of RHCC.

关键词： Carcinoma Hepatocellular Liver Ablation Catheter Radio frequency ablation Ablation techniques Medication therapy management RECIST

One or two things Restoration works about architecture： at Trajan＇s Market

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2015年第2期4卷 81-90页

作者： riccardo d'Aquino1 33 via Guido Reni 00196 Rome Italy

One of the objectives of the redevelopment project for Trajan＇s Market, which spanned from 2000 to 2002, was to rearrange the market＇s accessibility and the visiting paths that connect and cross the entire site. The purpose was to extensively expose its beauty and thus invite more tounsts into the area. The project design consisted of a series of catwalks placed at different levels and was conceived with respect to three criteria：（1） the didactic significance of forms and materials; （2） the coherence between architectural forms, techniques, and matenals with the identity of the place; and （3） the possibility of removing, if necessary, newly added elements without damaging the relics. The project also involved the rearrangement and reconstruction of the former ＂Giardino delle Mitizie＂（2002-2007） to allow public access to the archaeological stratification and to the ancient Roman street located at its bottom. Consequently, the vaults of the convent were suspended upon a system of steel beams, which, together with several wooden pillars, also support the glass roof of the space, offering a close view of the ancient Roman walls. The structure and architectural forms coincide, implying that each of these elements is necessary and genuine.

关键词： Conservation Charters Place Patimpsest .Heritage Trajan's Market

Percutaneous insertion of a novel dedicated metal stent to treat malignant hilar biliary obstruction

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2022年第9期14卷 1833-1843页

作者： Francesco Cortese Fabrizio Acquafredda Andrea Mardighian Maria Teresa Zurlo Valentina Ferraro riccardo Memeo Stavros Spiliopoulos riccardo Inchingolo Interventional Radiology Unit Miulli HospitalAcquaviva Delle Fonti 70124Italy Unit of Hepatobiliary Surgery Miulli hospitalAcquaviva Delle Fonti 70124Italy 2nd Radiology Department National and Kapodistrian University of AthensChaidari Athens 12461Greece

BACKGROUND Percutaneous bilateral biliary stenting is an established method for the management of unresectable malignant hilar biliary *** To evaluate the efficacy and safety of a novel uncovered biliary stent, specifically designed for hilar *** This, single-center, retrospective study included 18 patients(mean age 71 ± 11 years;61.1% male) undergoing percutaneous transhepatic Moving cell stent(MCS) placement for hilar reconstruction using the stent-in-stent technique for malignant biliary strictures, between November 2020 and July 2021. The Patients were diagnosed with cholangiocarcinoma(12/18;66.6%), gallbladder cancer(5/18;27.7%), and colorectal liver metastasis(1/18;5.5%). Primary endpoints were technical(appropriate stent placement) and clinical(relief from jaundice) success. Secondary endpoints included stent patency, overall survival, complication rates and stent-related *** The technical and clinical success rates were 100%(18/18 cases). According to Kaplan-Meier analysis, the estimated overall patient survival was 80.5% and 60.4% at 6 and 12 mo respectively, while stent patency was 90.9% and 68.2% at 6 mo and 12 mo respectively. The mean stent patency was 172.53 ± 56.20 d and median stent patency was 165 d(range 83-315). Laboratory tests for cholestasis significantly improved after procedure: mean total bilirubin decreased from 15.2 ± 6.0 mg/d L to 1.3 ± 0.4 mg/d L(P < 0.001);mean γGT decreased from 1389 ± 832 U/L to 114.6 ± 53.5 U/L(P < 0.001). One periprocedural complication was reported. Stent-related complications were observed in 5 patients(27.7%), including 1 occlusion(5.5%) and 1 stent migration(5.5 %).CONCLUSION Percutaneous hilar bifurcation biliary stenting with the MCS resulted in excellent clinical and technical success rates, with acceptable complication rates. Further studies are needed to confirm these initial positive results.

关键词： Malignant hilar biliary obstructions Hilar cholangiocarcinoma Self-expandable metallic stent Stent-in-stent technique Percutaneous approach Bilateral Y-stenting

Compressing deep-quaternion neural networks with targeted regularisation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2020年第3期5卷 172-176页

作者： riccardo Vecchi Simone Scardapane Danilo Comminiello Aurelio Uncini Department of Information Engineering Electronics and Telecommunications(DIET)‘Sapienza’University of RomeRoma Lazio 00185Italy

In recent years,hyper-complex deep networks(such as complex-valued and quaternion-valued neural networks–QVNNs)have received a renewed interest in the *** find applications in multiple fields,ranging from image reconstruction to 3D audio *** to their real-valued counterparts,quaternion neural networks require custom regularisation strategies to avoid *** addition,for many real-world applications and embedded implementations,there is the need of designing sufficiently compact networks,with few weights and ***,the problem of regularising and/or sparsifying QVNNs has not been properly addressed in the literature as of *** this study,the authors show how to address both problems by designing targeted regularisation strategies,which can minimise the number of connections and neurons of the network during *** this end,they investigate two extensions of ℓ1 and structured regularisations to the quaternion *** the authors’experimental evaluation,they show that these tailored strategies significantly outperform classical(realvalued)regularisation approaches,resulting in small networks especially suitable for low-power and real-time applications.

关键词： networks neural valued

Synchronous isolated splenic metastasis from colon carcinoma and concomitant splenic abscess:A case report and review of the literature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第41期13卷 5516-5520页

作者： Adolfo Pisanu Alberto Ravarino riccardo Nieddu Alessandro Uccheddu Department of Surgery Department of Pathology University of CagliariClinica ChirurgicaCagliariItaly

This study aimed to describe a case in which an isolated splenic metastasis was synchronous with the colonic primary and a concomitant splenic abscess was associated. A wide review of the literature was also performed. A 54-year-old woman with abdominal pain and fever was admitted to our department. Abdominal CT revealed two low-density areas in the spleen and wall-thickening of the left colonic flexure,which was indistinguishable from the spleen parenchyma. The patient underwent emergency celiotomy,with the presumptive diagnosis of obstructing colon carcinoma of the splenic flexure,and concomitant splenic abscess. Subtotal colectomy and splenectomy were performed. Pathological findings were consistent with mucinous colonic carcinoma,synchronous isolated splenic metastasis and concomitant splenic abscess. This paper is also a review of the existing literature on the association between colorectal cancer and splenic metastasis. Only 41 cases of isolated splenic metastasis from colon carcinoma have been reported in the literature. This report is the third described case of synchronous isolated splenic metastasis from colon carcinoma. Only one case with concomitant splenic abscess has been previously reported. When obstructing left-sided colorectal cancer is suspected,careful CT examination can allow early diagnosis of splenic involvement by the tumor. The literature review suggests that there might be a significant improvement in survival following splenectomy for a metachronous isolated splenic metastasis from colon carcinoma. Prognosis for synchronous splenic metastasis seems to be related to the advanced stage of the disease. Nevertheless,no definitive conclusions can be drawn because of the small number of cases.

关键词： Colon carcinoma Splenic abscess Splenic metastasis

Updates on larynx cancer epidemiology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2020年第1期32卷 18-25页

作者： riccardo Nocini Gabriele Molteni Camilla Mattiuzzi Giuseppe Lippi Section of Ear Nose and Throat(ENT) Department of Surgical SciencesDentistryGynecology and PediatricsUniversity of VeronaVerona 37134Italy Service of Clinical Governance Provincial Agency for Social and Sanitary ServicesTrento 38123Italy Section of Clinical Biochemistry Department of NeuroscienceBiomedicine and MovementUniversity of VeronaVerona 37134Italy

Objective: Laryngeal cancer is an important oncologic entity, whose prognosis depends on establishing appropriate preventive and diagnostic measures, especially in populations at higher ***: Epidemiologic information including worldwide incidence, prevalence, burden of health loss(disability-adjusted life year;DALYs) and mortality of larynx cancer was obtained from the Global Health Data Exchange(GHDx) ***: The current incidence, prevalence and mortality of laryngeal cancer are estimated at 2.76 cases/year per 100,000 inhabitants, 14.33 cases/year per 100,000 inhabitants and 1.66 deaths/year per 100,000 inhabitants,respectively, averaging 3.28 million DALYs each year. Incidence and prevalence have increased by 12% and 24%,respectively during the past 3 decades, whilst mortality has declined by around 5%. The epidemiologic burden of this malignancy is approximately 5-fold higher in males and increases in parallel with ageing, peaking after 65 years of age. Both incidence and mortality rates are higher in Europe and lower in Africa, but the ratio between deaths and incidence is the highest in Africa. Incidence has gradually declined in Europe during the past 3 decades, whilst it has increased in South-East Asia and Western Pacific. Cigarette smoking and alcohol abuse contribute for about 90% of overall worldwide mortality for laryngeal ***: Laryngeal cancer still poses a high clinical and societal burden, with an escalating temporal trend not expected to reverse soon.

关键词： Larynx laryngeal cancer larynx cancer epidemiology mortality

Capsule endoscopy in celiac disease

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第26期14卷 4146-4151页

作者： Cristiano Spada Maria Elena Riccioni riccardo Urgesi Guido Costamagna Digestive Endoscopy Unit Catholic UniversityRome 00168Italy

Video capsule endoscopy is an attractive and patient- friendly tool that provides high quality images of the small bowel. Obscure gastrointestinal bleeding is the primary and most evaluated indication to capsule endoscopy;however,indications are expanding and a small number of preliminary reports have been presented concerning the role of video capsule endoscopy in the diagnosis of celiac disease. The purpose of this review is to update the current knowledge and to hypothesize on future perspectives of the use of video capsule endoscopy in patients with celiac disease.

关键词： Capsule endoscopy Celiac disease Diagnosis of celiac disease Celiac disease complications

Gadoxetic acid magnetic-enhanced resonance imaging in the diagnosis of cholangiocarcinoma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2020年第29期26卷 4261-4271页

作者： riccardo Inchingolo Cesare Maino Marco Gatti Eleonora Tricarico Michele Nardella Luigi Grazioli SandroSironi Davide Ippolito riccardo Faletti Division of Interventional Radiology Department of RadiologyMadonna delle Grazie HospitalMatera 75100Italy Department of Diagnostic Radiology School of MedicineUniversity of Milano-BicoccaMonza 20900Italy Department of Surgical Sciences Radiology UnitUniversity of TurinTurin 10126Italy Department of Radiology Spedali CiviliUniversity of BresciaBrescia 25123Italy Department of radiology Papa Giovanni XXIII HospitalUniversity Milano-BicoccaBergamo 20110Italy

The use of liver magnetic resonance imaging is increasing thanks to itsmultiparametric sequences that allow a better tissue characterization, and the useof hepatobiliary contrast agents. This review aims to evaluate gadoxetic acidenhanced magnetic resonance imaging in the diagnosis and staging ofcholangiocarcinoma and its different clinical and radiological classificationsproposed in the literature. We also analyze the epidemiology, risk factors incorrelation with clinical findings and laboratory data.

关键词： Hepatobiliary contrast materials Gadoxetic acid Cholangiocarcinoma Magnetic resonance imaging Liver Cirrhosis