12 results on '"E. De Cuypere"'
Search Results
2. Performance analysis of a decoupling stock in a Make-to-Order system
- Author
-
E. De Cuypere, Dieter Fiems, and K. De Turck
- Subjects
Inventory control ,Mathematical optimization ,Queueing theory ,Technology and Engineering ,Build to order ,Computer science ,decoupling point ,queueing theory ,performance evaluation ,production systems ,Markov process ,inventory control ,Inefficiency ,Stock (geology) - Abstract
In a Make-to-Order system, products are only manufactured when orders are placed. As this may lead to overly long delivery times, a stock of semi-finished products can be installed to reduce production time: the so-called decoupling stock. As performance of the decoupling stock is critical to the overall performance and cost of the production system, we propose and analyse a Markovian model of the decoupling stock. In particular, we focus on a queueing model with two buffers, thereby accounting for both the decoupling stock as well as for possible backlog of orders. By means of numerical examples, we then quantify the impact of production inefficiency on delivery times and overall cost.
- Published
- 2012
3. Markovian SIR model for opinion propagation
- Author
-
E. De Cuypere, K. De Turck, Dieter Fiems, and Sabine Wittevrongel
- Subjects
Fluid limit ,Technology and Engineering ,Computer science ,Population turnover ,Transmission rate ,Markov process ,symbols.namesake ,Variable (computer science) ,symbols ,Taylor series ,Applied mathematics ,Epidemic model ,Mathematical economics ,Approximate solution - Abstract
In this work, we propose a new model for the dynamics of single opinion propagation at a size-limited location with a low population turnover. This means that a maximum number of individuals can be supported by the location and that the allowed individuals have a long sojourn time before leaving the location. The individuals can have either no opinion (S), a strong opinion that they want to spread (I), or an opinion that they keep for themselves (R); the letters stem from the popular Susceptible-Infectious-Recovered (SIR) epidemic model. Furthermore, we consider a variable opinion transmission rate. Hence, the opinion spreading is modelled as a Markovian non-standard SIR epidemic model with stochastic arrivals, departures, infections and recoveries. We evaluate the system performance by two complementary approaches: we apply a numerical but approximate solution approach which relies on Maclaurin series expansions and we investigate the fluid limit of the system at hand. Finally, we illustrate our approach by some numerical examples.
- Published
- 2013
4. Performance Analysis of a Kitting Process as a Paired Queue
- Author
-
E. De Cuypere, K. De Turck, and Dieter Fiems
- Subjects
Engineering ,Article Subject ,business.industry ,General Mathematics ,lcsh:Mathematics ,Real-time computing ,General Engineering ,Process (computing) ,Markov process ,Manufacturing systems ,lcsh:QA1-939 ,Industrial engineering ,symbols.namesake ,Assembly systems ,lcsh:TA1-2040 ,Container (abstract data type) ,symbols ,business ,lcsh:Engineering (General). Civil engineering (General) ,Queue - Abstract
Nowadays, customers request more variation in a company’s product assortment leading to an increased amount of parts moving around on the shop floor. To cope with this tendency, a kitting process can be implemented. Kitting is the operation of collecting the necessary parts for a given end product in a specific container, called a kit, prior to arriving at an assembly unit. As kitting performance is critical to the overall cost and performance of the manufacturing system, this paper analyses a two-part kitting process as a Markovian model. In particular, kitting is studied as a paired queue, thereby accounting for stochastic part arrivals, and kit assembly times. Using sparse matrix techniques, we assess the impact of kitting interruptions, bursty part arrivals and phase-type distributed kit assembly times on the behaviour of the part buffers. Finally, a cost-profit analysis of kitting processes is conducted and an approximation for a two-part kitting process is established.
- Published
- 2013
5. A vitamin K antagonist rapidly reverses a blue toe syndrome in a patient with lupus anticoagulant and antiprothrombin antibodies
- Author
-
M Vanrusselt, E De Cuypere, Kathelijne Peerlinck, Jozef Vermylen, Raymond Verhaeghe, and Jozef Arnout
- Subjects
Adult ,Male ,medicine.medical_specialty ,Vitamin K ,medicine.drug_class ,Blue Toe Syndrome ,Gastroenterology ,Phenprocoumon ,Antiphospholipid syndrome ,Ischemia ,Internal medicine ,medicine ,Humans ,Autoantibodies ,Lupus anticoagulant ,business.industry ,Anticoagulant ,Anticoagulants ,General Medicine ,Vitamin K antagonist ,Toes ,medicine.disease ,Antiphospholipid Syndrome ,Thrombosis ,Surgery ,Venous thrombosis ,Lupus Coagulation Inhibitor ,Prothrombin ,business ,medicine.drug - Abstract
A 30-year old male was admitted to the hospital with extremely painful blueish discoloration of his toes. After clinical and laboratory evaluation the diagnosis of a blue toe syndrome due to primary antiphospholipid syndrome (APS) was made. Complete resolution of the blue toe syndrome occurred within 72 hours following 9 mg phenprocoumon. APS consists of the association of lupus anticoagulant or antiphospholipid antibodies with arterial or venous thrombosis, thrombocytopenia, and spontaneous abortion. The exact pathways leading to thrombosis are still unknown. Our group has previously proposed that membrane-associated immune complexes contribute towards clinical symptoms in the antiphospholipid syndrome. The case presented strengthens that concept.
- Published
- 2002
6. Robotic-Assisted Pelvic Exenteration for Cervical Cancer: A Systematic Review and Novel Insights into Compartment-Based Imaging.
- Author
-
Van Trappen P, Walgraeve MS, Roels S, Claes N, De Cuypere E, Baekelandt F, and Arentsen H
- Abstract
Background: Patients with persistent or recurrent cervical cancer, following primary treatment with concurrent chemoradiation, represent a subgroup eligible for pelvic exenteration. In light of the substantial morbidity associated with open pelvic exenterations, minimally invasive surgical techniques have been introduced. This systematic review aims to analyze and discuss the current literature on robotic-assisted pelvic exenterations in cervical cancer. In addition, novel aspects of compartment-based magnetic resonance imaging (MRI) are highlighted. Methods: This systematic review followed the PRISMA guidelines, and a comprehensive literature search on robotic-assisted pelvic exenterations in cervical cancer was conducted to assess, as main objectives, early and late postoperative complications as well as oncological outcomes. Inclusion and exclusion criteria were applied to select eligible studies. Results: Among the reported cases of robotic-assisted pelvic exenterations in cervical cancer, 79.4% are anterior pelvic exenterations. Intraoperative complications are minimal and early/late major complications averaged between 30-35%, which is lower compared to open pelvic exenterations. Oncological outcomes are similar between robotic and open pelvic exenterations. Sensitivity for locoregional invasion increases up to 93% for compartment-based MRI in colorectal cancer. A refined delineation of the seven pelvic compartments for cervical cancer is proposed here. Conclusions: Robotic-assisted pelvic exenterations have demonstrated feasibility and safety, with reduced rates of major complications compared to open surgery, while maintaining surgical efficiency and oncological outcomes. Compartment-based MRI holds promise for standardizing the selection and categorization of pelvic exenteration procedures.
- Published
- 2024
- Full Text
- View/download PDF
7. Primary leiomyosarcoma of the uterine cervix: an unusual case and critical appraisal.
- Author
-
Lebbe I, De Cuypere E, Claes N, Loccufier A, Ghysel C, and Van Trappen P
- Abstract
Leiomyosarcomas of the uterine cervix are rare, mostly occurring in perimenopausal women. Diagnosis is based on pathology and immunohistochemistry. Surgery with a total abdominal hysterectomy and bilateral salpingo-oophorectomy remains the standard. A female patient in her 60s presented with heavy postmenopausal bleeding. Vaginal ultrasound scan and magnetic resonance imaging showed a large strongly vascularized cervical mass with features suspicious of sarcomatous degeneration. Positron Emission Tomography-Computed Tomography (PET-CT) did not reveal any evidence of metastases nor lymphadenopathy, but presence of right hydronephrosis. An abdominal hysterectomy with bilateral salpingo-oophorectomy, and end-to-end anastomosis of the right ureter, was performed. Pathology showed an International Federation of Gynecology and Obstetrics (FIGO)-stage 1B leiomyosarcoma of the uterine cervix. No adjuvant treatment was given. Adjuvant radiotherapy reduces the risk of recurrence but no survival impact. The benefit of adjuvant chemotherapy is questionable given the lack of randomized trials. Multidisciplinary research concerning molecular alterations of the disease is required to determine optimal management strategies with potential novel molecular therapies., Competing Interests: None declared., (Published by Oxford University Press and JSCR Publishing Ltd. © The Author(s) 2023.)
- Published
- 2023
- Full Text
- View/download PDF
8. Case report: a robotic-vaginal approach for total vaginectomy and hysterectomy with pelvic sentinel lymph node dissection in primary vaginal melanoma: a 10-step technique and literature review.
- Author
-
Van Trappen P, Lebbe I, De Cuypere E, and Claes N
- Abstract
Introduction: Primary vaginal melanoma is extremely rare, has a poor prognosis, and occurs mostly in elderly women. The diagnosis is based on histology and immunohistochemistry of a biopsy. Given the rarity of vaginal melanoma, no standardized treatment guidelines are established; however, surgery is the primary treatment modality in the absence of metastatic disease. Most reports in the literature are retrospective single cases, case series, and population-based studies. The open surgical approach is the main modality reported. Here, we report for the first time a 10-step combined robotic-vaginal technique, with en bloc resection of the uterus and total vagina, for treating clinically early-stage primary vaginal melanoma. In addition, the patient in our case underwent a robotic pelvic bilateral sentinel lymph node dissection. The literature on the surgical approach for vaginal melanoma is reviewed., Case Presentation: A 73-year-old woman was referred to our tertiary cancer center and was clinically staged according to the 2009 International Federation of Gynaecology and Obstetrics (FIGO) staging for vaginal cancer as FIGO-stage I (cT1bN0M0) and according to the American Joint Committee on Cancer (AJCC) for (cutaneous) Melanoma Staging as clinical stage IB. Preoperative imaging with magnetic resonance imaging, FDG-positron emission tomography-computed tomography, and ultrasound of the groins did not reveal any adenopathy nor metastases. The patient was planned for a combined vaginal and robotic en bloc total vaginectomy and hysterectomy, as well as a pelvic bilateral sentinel lymph node dissection., Results: The surgical procedure was performed in 10 steps described in this case report. The pathology revealed free surgical margins and negative test results for all sentinel lymph nodes. The postoperative recovery process was uneventful, and the patient was discharged on day 5., Conclusion: The main surgical approach reported for primary early-stage vaginal melanoma is open surgery. A minimally invasive surgical approach, described here as a combined vaginal-robotic en bloc total vaginectomy and hysterectomy, for the surgical treatment of early-stage vaginal melanoma enables precise dissection, low surgical morbidity, and fast recovery for the patient., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (© 2023 Van Trappen, Lebbe, De Cuypere and Claes.)
- Published
- 2023
- Full Text
- View/download PDF
9. Robotic surgery in early and advanced ovarian cancer: Case selection for surgical staging and interval debulking surgery.
- Author
-
Van Trappen P, de Cuypere E, and Claes N
- Subjects
- Humans, Female, Cytoreduction Surgical Procedures methods, Retrospective Studies, Cohort Studies, Prospective Studies, Neoplasm Staging, Chemotherapy, Adjuvant, Carcinoma, Ovarian Epithelial pathology, Neoadjuvant Therapy, Robotic Surgical Procedures, Ovarian Neoplasms pathology, Peritoneal Diseases pathology
- Abstract
Objective: During the last decade several case series have been published on robotic surgery in early and advanced stage ovarian cancer. Although most studies lack a significant oncological follow-up, more importantly criteria for patient selection for both robotic surgical staging (R-SS) and robotic interval debulking surgery (R-IDS) are not well defined. The objective of this study was to assess the surgical and oncological outcomes, using well-defined selection criteria, between robotic and open surgery in early and advanced stage ovarian cancer., Study Design: Single-center retrospective case cohort study including 96 ovarian cancer patients. For early stage ovarian cancer, patients were selected for R-SS after laparoscopic salpingo-oophorectomy of a suspicious adnexal mass. For advanced stage ovarian cancer, only patients receiving neoadjuvant chemotherapy and IDS were included in the study. Exclusion criteria were the presence of residual peritoneal disease after NACT and/or patients requiring additional complex surgical procedures., Results: For early stage ovarian cancer, similar median operative times were seen between R-SS and open surgical staging (O-SS), 132 min and 120 min respectively. Pelvic/para-aortic lymph node yield was similar between R-SS and O-SS, 22/11 nodes and 18/8 nodes respectively. Surgical upstaging occurred in 11.5% in the R-SS group and in 27.6% in the O-SS group. In advanced stage ovarian cancer, the BMI was significantly higher in the R-IDS group compared to the O-IDS group (27.8 vs 23.5; p =.006). The median follow was 52 months in the R-IDS group and 31 months in the O-IDS group. Recurrent disease occurred in 42.9% of the R-IDS group and in 45% of the O-IDS group. The length of hospitalization was significantly longer in the O-SS and O-IDS group (p <.00001)., Conclusion: Patients with clinically early stage ovarian cancer, confirmed after laparoscopic removal of a suspicious adnexal mass, are candidates for R-SS whilst maintaining similar surgical and oncological outcome measures as O-SS. In advanced ovarian cancer, suitable candidates for R-IDS are those who receive NACT with good response and no residual peritoneal disease, especially in patients with a high BMI, but large prospective randomized trials with well-defined criteria are needed., Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: PVT is Proctor for Intuitive Surgical, Inc. (Sunnyvale, CA, USA). EDC and NC declare that they have no conflict of interest., (Copyright © 2022 Elsevier B.V. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
10. Robotic Staging of Cervical Cancer With Simultaneous Detection of Primary Pelvic and Secondary Para-Aortic Sentinel Lymph Nodes: Reproducibility in a First Case Series.
- Author
-
Van Trappen P, De Cuypere E, Claes N, and Roels S
- Abstract
Objective: Discrepancies exist among international guidelines on the surgical staging of para-aortic lymph nodes in locally advanced cervical cancer (LACC), varying from considering a para-aortic lymph node dissection, at least up to the inferior mesenteric artery, to a complete para-aortic lymph node dissection. In this study, we aim to assess the reproducibility of our recently reported robotic technique using indocyanine green for identifying besides primary pelvic sentinel lymph nodes (SLNs), secondary para-aortic SLNs in a first case-cohort of cervical cancer patients., Methods: A retrospective case series of LACC patients with/without suspicious pelvic lymph nodes (LNs) on imaging (including two patients with an additional suspicious para-aortic LN) is reported. All patients underwent a robotic pelvic SLN and para-aortic sentinel/nonsentinel LN dissection using the da Vinci Xi platform. Indocyanine green was used as a fluorescent tracer, at a concentration of 1.9 mg/mL, and injected as 0.5 mL in each quadrant of the cervix., Results: In a total of 10 cases, primary pelvic SLNs (90% bilateral) with subsequent secondary para-aortic SLNs were identified in all cases. Lower para-aortic SLNs were present in all cases, and upper para-aortic SLNs were found in 9 out of 10 cases. The mean age of the cervical cancer patients was 49.8 years (SD ± 6.89), and the mean body mass index (BMI; kg/m
2 ) was 23.96 (SD ± 4.60). The median total operative time was 105.5 min (range: 89-141 min). The mean numbers of primary pelvic SLNs and secondary lower and upper para-aortic SLNs were 3.10 (SD ± 1.10), 2.90 (SD ± 0.74), and 2.30 (SD ± 1.57), respectively. The median number of total para-aortic LNs (PALNs) dissected per patient was 11.5. Six patients had positive primary pelvic SLNs, and two had secondary positive para-aortic SLNs. The nonsentinel para-aortic LNs were negative in all cases. There were no intra- or postoperative complications., Conclusion: Our preliminary experience demonstrates the reproducibility of identifying, besides primary pelvic SLNs, secondary lower and upper para-aortic SLNs during robotic staging in LACC. A surgical approach limiting a complete para-aortic LN dissection could reduce the potential risks and morbidity associated with this procedure. To determine the sensitivity and negative predictive value of this new surgical approach, and whether the lower para-aortic SLNs under the inferior mesenteric artery are representative of the whole para-aortic region, large prospective observational studies are needed in LACC and/or those with suspicious pelvic LNs but apparent normal para-aortic LNs on imaging., Competing Interests: Author PVT is Proctor for Intuitive Surgical, Inc. (Sunnyvale, CA, USA). The remaining authors, EDC, NC, and SR, declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Van Trappen, De Cuypere, Claes and Roels.)- Published
- 2022
- Full Text
- View/download PDF
11. Bone scan alterations in aromatase inhibitor-treated patients.
- Author
-
De Geeter F, Van den Bruel A, De Cuypere E, and Langlois M
- Subjects
- Adult, Antineoplastic Agents therapeutic use, Aromatase Inhibitors therapeutic use, Female, Humans, Middle Aged, Radionuclide Imaging, Antineoplastic Agents adverse effects, Aromatase Inhibitors adverse effects, Bone and Bones diagnostic imaging, Breast Neoplasms drug therapy
- Abstract
We report bone scan changes in 3 patients receiving aromatase inhibitors as adjuvant treatment for postmenopausal hormone receptor-positive breast cancer. Compared with bone scans before treatment, repeated scans after at least 10 months of aromatase inhibitor treatment showed increased activity in the peripheral skeleton and the skull. In 2 patients, these alterations could be correlated with increased markers of bone turnover. They probably result from high bone turnover induced by estrogen depletion caused by aromatase inhibitors. This effect should be taken into account in the differential diagnosis of a bone scan pattern suggestive of hyperparathyroidism, which was ruled out.
- Published
- 2015
- Full Text
- View/download PDF
12. A vitamin K antagonist rapidly reverses a blue toe syndrome in a patient with lupus anticoagulant and antiprothrombin antibodies.
- Author
-
De Cuypere E, Peerlinck K, Verhaeghe R, Vanrusselt M, Arnout J, and Vermylen J
- Subjects
- Adult, Antiphospholipid Syndrome diagnosis, Humans, Lupus Coagulation Inhibitor analysis, Male, Prothrombin immunology, Anticoagulants therapeutic use, Antiphospholipid Syndrome complications, Autoantibodies analysis, Ischemia drug therapy, Phenprocoumon therapeutic use, Toes blood supply, Vitamin K antagonists & inhibitors
- Abstract
A 30-year old male was admitted to the hospital with extremely painful blueish discoloration of his toes. After clinical and laboratory evaluation the diagnosis of a blue toe syndrome due to primary antiphospholipid syndrome (APS) was made. Complete resolution of the blue toe syndrome occurred within 72 hours following 9 mg phenprocoumon. APS consists of the association of lupus anticoagulant or antiphospholipid antibodies with arterial or venous thrombosis, thrombocytopenia, and spontaneous abortion. The exact pathways leading to thrombosis are still unknown. Our group has previously proposed that membrane-associated immune complexes contribute towards clinical symptoms in the antiphospholipid syndrome. The case presented strengthens that concept.
- Published
- 2002
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.