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Timmerman, Marjolijn E.W.,Trzpis, Monika,Broens, Paul M.A. The Korean Society of Pediatric Gastroenterology 2021 Pediatric gastroenterology, hepatology & nutrition Vol.24 No.1
Purpose: We aimed to compare the prevalence rates and associated symptoms of constipation and fecal incontinence in children and young adults and evaluate how these patient groups cope with these disorders. Methods: A cross-sectional study was performed in which 212 children (8-17 years) and 149 young adults (18-29 years) from the general Dutch population completed a questionnaire about defecation disorders. Results: Constipation occurred in 15.6% of children and 22.8% of young adults (p=0.55), while the prevalence of fecal incontinence was comparable between groups (7%, p=0.91). The symptoms associated with constipation occurred as often in children as in young adults, while most fecal incontinence symptoms occurred more often in young adults. Approximately 43% of children had constipation for more than 5 years, while 26% of young adults experienced constipation since childhood. Only 27% of constipated children and 21% of constipated young adults received treatment (mostly laxatives). For fecal incontinence, 13% of children and 36% of young adults received treatment (mostly antidiarrheal medications or incontinence pads). Conclusion: In contrast to the general belief, the prevalence of defecation disorders and associated symptoms seem to be comparable in children and young adults. Only a few people with defecation disorders receive adequate treatment.
Modeling Agglomeration Forces in Urban Dynamics : A Multi-Agent System Approach
Theo Arentze, Harry Timmermans 서울시립대학교 도시과학연구원 2003 International journal of urban sciences (IJUS) Vol. No.
Urban dynamics is driven by the location decisions of firms and households. The preferences of households and firms for a certain location generally depend on the presence of other households or firms at the same location. In this paper, we propose and illustrate a multi-agent model that takes such agglomeration effects into account. In the model, the households or firms that are potentially interested in a candidate site for (re-)development are individually represented as agents that can indicate their interest by making a bid. In compiling a proposal based on bids of individual agents, the model takes positive and negative synergies between agents into account. Planners and developers are also represented in the model as agents playing specific roles in the process. Simulations in the area of retailing demonstrate the model and show that agglomeration effects have an impact on generated proposals. It is argued that the model can be used as a location-decision component in dynamic multiagent, land-use systems for simulation or planning support.
Examining Temporal Effects of Lifecycle Events on Transport Mode Choice Decisions
Marloes Verhoeven, Theo Arentze, Harry Timmermans, Peter van der Waerden 서울시립대학교 도시과학연구원 2007 International journal of urban sciences (IJUS) Vol. No.
This paper describes the first results of a study on the impact of events on transport mode choice decisions. An Internet-based survey was designed to collect data concerning seven structural lifecycle events. In addition, respondents answered questions about personal and household characteristics, possession and availability of transport modes and their current travel behaviour. In total, 710 respondents completed the online survey. The complexity of transport mode choice is modelled using a Bayesian Decision Network. This paper focuses only on the time influence of events on transport mode choice decisions. We assume that people change or at least reconsider their behaviour after a structural lifecycle event, at times directly after experiencing a change and at times only after a period of time. We estimated a multinomial choice model to estimate the effect of these structural events, and in particular of the length of the time elapsed, on transport mode choice.
Activity-based models of travel demand: promises, progress and prospects
Soora Rasouli,Harry Timmermans 서울시립대학교 도시과학연구원 2014 도시과학국제저널 Vol.18 No.1
Because two decades have almost passed since the introduction of activity-based modelsof travel demand, this seems the right time to evaluate progress made in the developmentand application of these models. This invited paper seeks to discuss the initial promisesof activity-based models as an alternative to four-step and tour-based models, summarizeprogress made and identify still unsolved issues that require further research.
Electrically assisted bicycles
Ph. Lataire,J. M. Timmermans,G. Maggetto,P. Van den Bossche,J. Cappelle 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.1
This paper reports on work performed at the Vrije Universiteit Brussel on Electrically assisted bicycles, first in the scope of the European E-TOUR-project, next in subsequent work in the continuation of this project. Three aspects of electrically assisted bicycles have been considered: the bicycles have been evaluated for commuting use throughout the city; the bicycles have been evaluated on a test facility developed on purpose at the university; a group of test persons out of the “ageing population” has been tested on a physiological-medical basis for evaluation of the benefits that a renewed physical activity with electric bicycles can bring. This paper focuses on the technical evaluation of the bicycles and the Human Interface.
Lara Burg,Maite Timmermans,Maaike van der Aa,Dorry Boll,Koen Rovers,Ignace de Hingh,Anne van Altena 대한부인종양학회 2020 Journal of Gynecologic Oncology Vol.31 No.5
Objective: Peritoneal metastases (PM) are a challenge in gynecological cancers, but itsappearance has never been described in a population-based study. Therefore, we describe theincidence of PM and identify predictors that increase the probability of peritoneal spread. Methods: All ovarian, endometrial and cervical cancer patients diagnosed in the Netherlandsbetween 1989 and 2015 were identified from the Netherlands Cancer Registry and stratifiedfor PM. Crude and age-adjusted incidence over time was calculated. Independent predictorsfor PM were identified using uni- and multivariable analyses. Results: The 94,981 patients were diagnosed with ovarian, endometrial or cervicalcancer and respectively 61%, 2% and 1% presented with PM. Predictors for PM in ovariancancer were: age between 50 and 74 years (odds ratio [OR]=1.19; 95% confidence interval[CI]=1.08–1.32), other distant metastases (OR=1.25; 95% CI=1.10–1.41), poor differentiationgrade (OR=2.00; 95% CI=1.73–2.32) and serous histology. Predictors in endometrial cancerwere lymph node metastases (OR=2.32; 95% CI=1.65–3.26), other distant metastases(OR=1.38; 95% CI=1.08–1.77), high-grade tumors (OR=1.95; 95% CI=1.38–2.76) and clearcell (OR=1.49; 95% CI=1.04–2.13) or serous histology (OR=2.71; 95% CI=2.15–3.42). Incervical cancer, the risk is higher in adenocarcinoma than in squamous cell carcinoma(OR=4.92; 95% CI=3.11–7.79). Conclusion: PM are frequently seen in patients with ovarian cancer. In endometrial andcervical cancer PM are rare. Histological subtype was the strongest predictive factor for PMin all 3 cancers. Better understanding of predictive factors for PM and thus the biologicalbehavior is of paramount importance.