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  1. Book ; Conference proceedings ; Online: HotOS XIV

    Maniatis, Petros

    14th Workshop on Hot Topics in Operating Systems ; May 13 - 15, 2013, Santa Ana Pueblo, New Mexico

    2013  

    Institution USENIX Association
    Event/congress HotOS (14, 2013.05.13-15, SantaAnaPuebloNM) ; Workshop on Hot Topics in Operating Systems (14, 2013.05.13-15, SantaAnaPuebloNM)
    Author's details USENIX Association. Program chair: Petros Maniatis
    Language English
    Size Online-Ressource (PDF-Datei)
    Publisher USENIX Association
    Publishing place Berkeley, Calif
    Document type Book ; Conference proceedings ; Online
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  2. Article: Parastomal Gallbladder Herniation as an Incidental Preoperative Computed Tomography Finding.

    Smarda, Magdalini / Manes, Konstantinos / Fagkrezos, Dimitrios / Argiropoulos, Dimitrios / Laios, Konstantinos / Triantopoulou, Charickleia / Maniatis, Petros

    Case reports in radiology

    2021  Volume 2021, Page(s) 8864347

    Abstract: A 65-year-old woman with a long surgical history was referred to our hospital's Colorectal Unit for ileostomy management. The patient retained an ileostomy for almost a decade after a series of complicated operations she had undergone, which had several ... ...

    Abstract A 65-year-old woman with a long surgical history was referred to our hospital's Colorectal Unit for ileostomy management. The patient retained an ileostomy for almost a decade after a series of complicated operations she had undergone, which had several side effects such as electrolyte imbalances, high output, weight loss, and a parastomal hernia. Our hospital's colorectal surgeon proposed to replace the ileostomy with a permanent sigmoidostomy and asked for an imaging evaluation of the parastomal hernia content before the surgery. A computed tomography of the abdomen was performed using our Computed Tomography Department's 64-detector row CT scanner after oral administration of contrast media, without intravenous contrast media injection due to allergy. Concerning the parastomal ileostomal hernia, besides small bowel loops with intraluminal gastrografin, inside the parastomal hernial sac, there also was an almost rounded cystic lesion. Absence of the gallbladder at its typical position and no record of cholecystectomy raised suspicion for gallbladder projection inside the sac. Our suspicion was confirmed during the surgery. Nonexisting acute cholecystitis allowed easy reduction of the gallbladder along with the small bowel loops inside the peritoneal cavity, without proceeding to cholecystectomy at the same time. Finally, ileostomy was annulated and an end colostomy was established. Four days after the surgery, the patient was discharged from the hospital and was happy to live an almost normal life thereafter.
    Language English
    Publishing date 2021-02-11
    Publishing country United States
    Document type Case Reports
    ZDB-ID 2627655-0
    ISSN 2090-6870 ; 2090-6862
    ISSN (online) 2090-6870
    ISSN 2090-6862
    DOI 10.1155/2021/8864347
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Stentless Aortic Bioprosthetic Valves and Placement of Radiopaque Markers.

    Lama, Niki / Patris, Vasileios / Maniatis, Petros / Argiriou, Michalis

    The Annals of thoracic surgery

    2018  Volume 105, Issue 6, Page(s) 1864

    MeSH term(s) Animals ; Aortic Valve ; Bioprosthesis ; Heart Valve Prosthesis ; Swine
    Language English
    Publishing date 2018-05-18
    Publishing country Netherlands
    Document type Letter ; Comment
    ZDB-ID 211007-6
    ISSN 1552-6259 ; 0003-4975
    ISSN (online) 1552-6259
    ISSN 0003-4975
    DOI 10.1016/j.athoracsur.2017.10.052
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 252: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Book ; Online: A Library for Representing Python Programs as Graphs for Machine Learning

    Bieber, David / Shi, Kensen / Maniatis, Petros / Sutton, Charles / Hellendoorn, Vincent / Johnson, Daniel / Tarlow, Daniel

    2022  

    Abstract: Graph representations of programs are commonly a central element of machine learning for code research. We introduce an open source Python library python_graphs that applies static analysis to construct graph representations of Python programs suitable ... ...

    Abstract Graph representations of programs are commonly a central element of machine learning for code research. We introduce an open source Python library python_graphs that applies static analysis to construct graph representations of Python programs suitable for training machine learning models. Our library admits the construction of control-flow graphs, data-flow graphs, and composite ``program graphs'' that combine control-flow, data-flow, syntactic, and lexical information about a program. We present the capabilities and limitations of the library, perform a case study applying the library to millions of competitive programming submissions, and showcase the library's utility for machine learning research.

    Comment: 21 pages, 14 figures
    Keywords Computer Science - Machine Learning ; Computer Science - Programming Languages ; Computer Science - Software Engineering
    Publishing date 2022-08-15
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Book ; Online: CodeQueries

    Sahu, Surya Prakash / Mandal, Madhurima / Bharadwaj, Shikhar / Kanade, Aditya / Maniatis, Petros / Shevade, Shirish

    A Dataset of Semantic Queries over Code

    2022  

    Abstract: Developers often have questions about semantic aspects of code they are working on, e.g., "Is there a class whose parent classes declare a conflicting attribute?". Answering them requires understanding code semantics such as attributes and inheritance ... ...

    Abstract Developers often have questions about semantic aspects of code they are working on, e.g., "Is there a class whose parent classes declare a conflicting attribute?". Answering them requires understanding code semantics such as attributes and inheritance relation of classes. An answer to such a question should identify code spans constituting the answer (e.g., the declaration of the subclass) as well as supporting facts (e.g., the definitions of the conflicting attributes). The existing work on question-answering over code has considered yes/no questions or method-level context. We contribute a labeled dataset, called CodeQueries, of semantic queries over Python code. Compared to the existing datasets, in CodeQueries, the queries are about code semantics, the context is file level and the answers are code spans. We curate the dataset based on queries supported by a widely-used static analysis tool, CodeQL, and include both positive and negative examples, and queries requiring single-hop and multi-hop reasoning. To assess the value of our dataset, we evaluate baseline neural approaches. We study a large language model (GPT3.5-Turbo) in zero-shot and few-shot settings on a subset of CodeQueries. We also evaluate a BERT style model (CuBERT) with fine-tuning. We find that these models achieve limited success on CodeQueries. CodeQueries is thus a challenging dataset to test the ability of neural models, to understand code semantics, in the extractive question-answering setting.
    Keywords Computer Science - Software Engineering ; Computer Science - Computation and Language
    Subject code 005
    Publishing date 2022-09-17
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: Learning and Evaluating Contextual Embedding of Source Code

    Kanade, Aditya / Maniatis, Petros / Balakrishnan, Gogul / Shi, Kensen

    2019  

    Abstract: Recent research has achieved impressive results on understanding and improving source code by building up on machine-learning techniques developed for natural languages. A significant advancement in natural-language understanding has come with the ... ...

    Abstract Recent research has achieved impressive results on understanding and improving source code by building up on machine-learning techniques developed for natural languages. A significant advancement in natural-language understanding has come with the development of pre-trained contextual embeddings, such as BERT, which can be fine-tuned for downstream tasks with less labeled data and training budget, while achieving better accuracies. However, there is no attempt yet to obtain a high-quality contextual embedding of source code, and to evaluate it on multiple program-understanding tasks simultaneously; that is the gap that this paper aims to mitigate. Specifically, first, we curate a massive, deduplicated corpus of 7.4M Python files from GitHub, which we use to pre-train CuBERT, an open-sourced code-understanding BERT model; and, second, we create an open-sourced benchmark that comprises five classification tasks and one program-repair task, akin to code-understanding tasks proposed in the literature before. We fine-tune CuBERT on our benchmark tasks, and compare the resulting models to different variants of Word2Vec token embeddings, BiLSTM and Transformer models, as well as published state-of-the-art models, showing that CuBERT outperforms them all, even with shorter training, and with fewer labeled examples. Future work on source-code embedding can benefit from reusing our benchmark, and from comparing against CuBERT models as a strong baseline.

    Comment: Published in ICML 2020. This version (v.3) is the final camera-ready version of the paper. It contains the re-computed results, based on the open-sourced datasets
    Keywords Computer Science - Software Engineering ; Computer Science - Computation and Language ; Computer Science - Machine Learning ; Computer Science - Programming Languages
    Publishing date 2019-12-21
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Massive Scrotal Hematoma due to Ruptured Anastomotic Pseudoaneurysm in a Patient with Aortobifemoral Bypass Surgery: CTA Evaluation.

    Smarda, Magdalini / Fagkrezos, Dimitrios / Dodos, Ilias / Potouridis, Anastasios / Staramos, Dimitrios / Triantopoulou, Charikleia / Maniatis, Petros

    Case reports in vascular medicine

    2019  Volume 2019, Page(s) 9013697

    Abstract: A 74-year-old male patient was presented with scrotal swelling and a pulsatile mass of the left femoro-inguinal region. His medical history included hypertension, coronary artery disease, respiratory failure, and an aortobifemoral bypass surgery ... ...

    Abstract A 74-year-old male patient was presented with scrotal swelling and a pulsatile mass of the left femoro-inguinal region. His medical history included hypertension, coronary artery disease, respiratory failure, and an aortobifemoral bypass surgery performed 7 years ago. Ultrasound evaluation revealed a massive scrotal hematoma. Computed tomography angiography (CTA) was conducted, confirming the aortobifemoral graft existence and revealing bilateral anastomotic pseudoaneurysms with the left one being ruptured, resulting in extension of the hematoma to the left femoro-inguinal region and the scrotum. An emergency surgery was performed, where proximal control of the left limb of the synthetic graft as well as distal control of the iliac vessels were accomplished. After the control of the hemorrhage, an iliofemoral bypass with a Polytetrafluoroethylene (PTFE) 6 mm synthetic graft was placed. Unfortunately, the patient passed away during the first postoperative day due to myocardial infarction.
    Language English
    Publishing date 2019-11-24
    Publishing country United States
    Document type Case Reports
    ZDB-ID 2629916-1
    ISSN 2090-6994 ; 2090-6986
    ISSN (online) 2090-6994
    ISSN 2090-6986
    DOI 10.1155/2019/9013697
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Book ; Online: Neural Program Repair by Jointly Learning to Localize and Repair

    Vasic, Marko / Kanade, Aditya / Maniatis, Petros / Bieber, David / Singh, Rishabh

    2019  

    Abstract: Due to its potential to improve programmer productivity and software quality, automated program repair has been an active topic of research. Newer techniques harness neural networks to learn directly from examples of buggy programs and their fixes. In ... ...

    Abstract Due to its potential to improve programmer productivity and software quality, automated program repair has been an active topic of research. Newer techniques harness neural networks to learn directly from examples of buggy programs and their fixes. In this work, we consider a recently identified class of bugs called variable-misuse bugs. The state-of-the-art solution for variable misuse enumerates potential fixes for all possible bug locations in a program, before selecting the best prediction. We show that it is beneficial to train a model that jointly and directly localizes and repairs variable-misuse bugs. We present multi-headed pointer networks for this purpose, with one head each for localization and repair. The experimental results show that the joint model significantly outperforms an enumerative solution that uses a pointer based model for repair alone.

    Comment: ICLR 2019
    Keywords Computer Science - Machine Learning ; Statistics - Machine Learning
    Subject code 006
    Publishing date 2019-04-02
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Secondary extramedullary plasmacytoma of sigmoid colon in a patient with multiple myeloma: a case report.

    Fagkrezos, Dimitris / Manes, Konstantinos / Paraskeva, Konstantina / Lenos, Michalis / Triantopoulou, Charikleia / Apessou, Dimitra / Maniatis, Petros

    Journal of medical case reports

    2018  Volume 12, Issue 1, Page(s) 379

    Abstract: Background: Extramedullary plasmacytoma is an uncommon tumor that most often involves the nasopharynx or upper respiratory tract. Extramedullary plasmacytoma is a type of plasma cell neoplasm that can present as a primary tumor or secondary to another ... ...

    Abstract Background: Extramedullary plasmacytoma is an uncommon tumor that most often involves the nasopharynx or upper respiratory tract. Extramedullary plasmacytoma is a type of plasma cell neoplasm that can present as a primary tumor or secondary to another plasma cell neoplasm, such as multiple myeloma. Secondary extramedullary plasmacytoma is usually noted in the advanced stages of the disease. Involvement of the gastrointestinal tract occurs in approximately 10% of cases.
    Case presentation: A 71-year-old Caucasian woman with known diverticular disease of the colon and multiple myeloma diagnosed 3 years previously, with monoclonal bands of immunoglobulin A, lambda light chains, and multiple osteolytic lesions, presented to our hospital with abdominal pain, abdominal discomfort, and pneumoperitoneum. She underwent left colectomy for diverticulitis with perforation, and an extramedullary secondary colonic plasmacytoma was found in histopathological examination of the sigmoid colon.
    Conclusions: Plasmacytoma is known to occur in extraosseous sites. The stomach and small intestine are the most commonly involved sites in the gastrointestinal tract. Secondary extramedullary plasmacytoma of the colon is rare. Colonic plasmacytoma may have varying clinical presentations, such as inflammatory bowel disease and multiple colonic strictures. Although these cases are rare, treating physicians as well as radiologists, pathologists, and surgeons should be aware of this entity.
    MeSH term(s) Abdominal Pain ; Aged ; Colectomy ; Colon, Sigmoid/pathology ; Diverticulitis/pathology ; Diverticulitis/surgery ; Female ; Humans ; Intestinal Perforation/surgery ; Multiple Myeloma/drug therapy ; Multiple Myeloma/pathology ; Plasmacytoma/pathology ; Plasmacytoma/surgery ; Pneumoperitoneum/diagnostic imaging ; Pneumoperitoneum/pathology ; Radiography, Abdominal ; Tomography, X-Ray Computed ; Treatment Outcome
    Language English
    Publishing date 2018-12-25
    Publishing country England
    Document type Case Reports ; Journal Article
    ZDB-ID 2269805-X
    ISSN 1752-1947 ; 1752-1947
    ISSN (online) 1752-1947
    ISSN 1752-1947
    DOI 10.1186/s13256-018-1888-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Post-traumatic pulmonary pseudocyst with hemopneumothorax following blunt chest trauma

    Fagkrezos Dimitris / Giannila Maria / Maniatis Petros / Papailiou John / Triantopoulou Charikleia

    Journal of Medical Case Reports, Vol 6, Iss 1, p

    a case report

    2012  Volume 356

    Abstract: Abstract Introduction Post-traumatic pulmonary pseudocyst is an uncommon cavitary lesion of the lung and develops after blunt chest trauma and even more rarely following penetrating injuries. It is generally seen in young adults presenting with cough, ... ...

    Abstract Abstract Introduction Post-traumatic pulmonary pseudocyst is an uncommon cavitary lesion of the lung and develops after blunt chest trauma and even more rarely following penetrating injuries. It is generally seen in young adults presenting with cough, chest pain, hemoptysis, and dyspnea. Post-traumatic pulmonary pseudocyst should be included in the differential diagnosis of cavitary pulmonary lesions. We describe the case of a 60-year-old Caucasian Greek woman who sustained traumatic pulmonary pseudocyst with hemopneumothorax due to a blunt chest trauma after a traffic accident. Case presentation After a traffic accident, a 60-year-old Caucasian Greek woman sustained a hemopneumothorax due to a blunt chest trauma. There was evidence of an extensive contusion in the posterior and lateral segments of the right lower lobe, a finding that was attributed to an early sign of a cavitation, and the presence of a thin-walled air cavity was detected on the anterior segment of the right lower lobe in the control computed tomography taken 24 hours after admission. Our patient was treated by catheter aspiration, and the findings of computed tomography evaluation about one month later showed complete resolution of one of the two air-filled cavitary lesions. The second pseudocyst also disappeared completely, as shown by the control computed tomography scan performed six months later. Conclusions Traumatic pulmonary pseudocyst is a rare complication of blunt chest trauma, and computed tomography is a more valuable imaging technique than chest radiograph for early diagnosis.
    Keywords Traumatic pulmonary pseudocyst ; lung cyst ; blunt chest trauma ; pulmonary contusion ; Medicine ; R
    Language English
    Publishing date 2012-10-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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