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See detailAirport capacity and inefficiency in slot allocation
Picard, Pierre M UL; wan, xi; Tampieri, Alessandro

in International Journal of Industrial Organization (2019), 62

This paper studies the time slot allocation of flight departures when travelers have a preference for departing on peak times and the number of available peak-time slots is constrained by airport ... [more ▼]

This paper studies the time slot allocation of flight departures when travelers have a preference for departing on peak times and the number of available peak-time slots is constrained by airport capacities. We show that, compared to public airports, private airports may restrain their supply of peak slots strictly below their capacity levels when they serve airlines that compete to the same destinations. Such an inefficiency takes place in airports that have low per-passenger charges and are not too busy. It does not occur in the absence of competition in destination markets. [less ▲]

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See detailForecasting spare part demand using service maintenance information
van der Auweraer, Sarah UL; Boute, Robert

in International Journal of Production Economics (2019), 213

We focus on the inventory management of critical spare parts that are used for service maintenance. These parts are commonly characterised by a large variety, an intermittent demand pattern and oftentimes ... [more ▼]

We focus on the inventory management of critical spare parts that are used for service maintenance. These parts are commonly characterised by a large variety, an intermittent demand pattern and oftentimes a high shortage cost. Specialized service parts models focus on improving the availability of parts whilst limiting the investment in inventories. We develop a method to forecast the demand of these spare parts by linking it to the service maintenance policy. The demand of these parts originates from the maintenance activities that require their use, and is thus related to the number of machines in the field that make use of this part (known as the active installed base), in combination with the part's failure behaviour and the maintenance plan. We use this information to predict future demand. By tracking the active installed base and estimating the part failure behaviour, we provide a forecast of the distribution of the future spare parts demand during the upcoming lead time. This forecast is in turn used to manage inventories using a base-stock policy. Through a simulation experiment, we show that our method has the potential to improve the inventory-service trade-off, i.e., it can achieve a certain cycle service level with lower inventory levels compared to the traditional forecasting techniques for intermittent spare part demand. The magnitude of the improvement increases for spare parts that have a large installed base and for parts with longer replenishment lead times. [less ▲]

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See detailTrans-corporeality und material memoirs : vergleichende Lektüre zweier Krebsblogs
Thiltges, Sébastian UL

in Pavlik, Jennifer; Bendheim, Amelie (Eds.) Figurationen von Krankheiten : Chancen und Grenzen einer Ästhetisierung (2019)

La présente contribution propose d’appliquer des concepts issus de l’écoféminisme et de l’écocritique matérielle (Iovino Oppermann, 2014), en particulier les notions de « trans-corporéalité » (Alaimo ... [more ▼]

La présente contribution propose d’appliquer des concepts issus de l’écoféminisme et de l’écocritique matérielle (Iovino Oppermann, 2014), en particulier les notions de « trans-corporéalité » (Alaimo Hekman, 2008), de « mémoire matérielle » (Alaimo, 2010) et de « cyborg » (Haraway, 2008), à l’étude de l’écriture du corps malade. Le corpus est composé de deux blogs dans lesquels les auteurs abordent leur cancer : Georges Hausemer (qui décède de sa maladie durant l’été 2018) est un écrivain, traducteur et éditeur luxembourgeois, auteur de romans et de récits de voyages, qui pendant plus de deux ans relate ses séjours hospitaliers et les traitements médicaux dans « Ich und mein Tumor » (« Moi et ma tumeur »). Élodie Malanda, docteure en littérature comparée et danseuse, fait le récit de sa maladie dans « Les cellules créatives », blog qui mêle écriture intime, chorégraphies, témoignages de patients et présentations de projets artistiques. La lecture comparative de ce corpus original permet de mettre en lumière plusieurs caractéristiques de l’écriture de la maladie sous forme de blog. D’une part, elle relève les moyens poétiques et esthétiques qu’offre ce support scriptural : temporalité singulière, ordre antéchronologique, renvois intertextuels et écriture « extime » [Tisseron, 2001] à l’ère du numérique. D’autre part, elle permet de comparer deux « graphies » corporelles, à savoir l’écriture et la danse, les deux auteurs décrivant et/ou exposant leurs corps constamment en mouvement. Finalement, les observations de G. Hausemer engagent une réflexion sur la perméabilité entre corps et environnement, entre matière organique et substances plastiques ou chimiques, alors qu’É. Malanda interroge le corps et la maladie en tant qu’objets culturels et, par conséquent, possibles sources de création. [less ▲]

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See detailForecasting spare part demand with installed base information: A review
van der Auweraer, Sarah UL; Boute, Robert; Syntetos, Aris

in International Journal of Forecasting (2019), 1

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See detailVom Sprechen zur Sprache. Versuch über die variationslinguistische Praxis des Begrenzens
Purschke, Christoph UL

in Palliwoda, Nicole; Sauer, Verena; Sauermilch, Stephanie (Eds.) Politische Grenzen – Sprachliche Grenzen? (2019)

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See detailVěci a jejich rozdělení; Prodej zboží v obchodě; Finanční služby; Unijní předpisy
Hubkova, Pavlina

in Petrov, Jan; Výtisk, Michal; Beran, Vladimír (Eds.) Občanský zákoník. Komentář. (2019)

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See detailPerzeptionslinguistik arealer Sprachvariation im Deutschen
Purschke, Christoph UL; Stoeckle, Philipp

in Herrgen, Joachim; Schmidt, Jürgen Erich (Eds.) Sprache und Raum – Deutsch. Ein internationales Handbuch der Sprachvariation (2019)

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See detailA gradualist path toward sortition
Burks, Deven UL; Kies, Raphaël UL

in Gastil, John; Wright, Erik Olin (Eds.) Legislature by Lot: Transformative Designs for Deliberative Governance (2019)

Conventional wisdom holds that building democracy takes time. Deliberative democracy will likely prove no exception. To that end, this chapter will explore one possible path towards more deliberative ... [more ▼]

Conventional wisdom holds that building democracy takes time. Deliberative democracy will likely prove no exception. To that end, this chapter will explore one possible path towards more deliberative institutions and decision-making in the form of Gastil and Wright’s proposal for a Sortition Chamber. Our thesis is that deliberative innovations, notably a sortition chamber, require a gradualist approach to implementation. While other authors in this volume may take for granted that some form of sortition chamber will be institutionalized and focus instead on design questions, we probe the necessary conditions preceding institutionalization. To support this thesis, we shall make an argument comprising four main claims. 1.) Sortition is a promising deliberative innovation. 2.) A strong, unaccountable deliberative device like sortition may delegitimize citizen deliberation and future deliberative innovations, in particular a sortition chamber. 3.) A weaker deliberative device like citizens’ consultation is effective though often blocked by a lack of institutional footing. 4.) Citizens’ consultation, once proven to be effective and regular, opens one path towards enhanced deliberative innovations like the sortition chamber. Claim 1.) will not be developed here beyond the point that a sortition chamber’s “hybrid legitimacy” may allow it to overcome critiques addressed to one-shot, single-issue consultative or 1 empowered mini-publics which may lack institutional footing1. Such mini-publics face multiple challenges: significant social or political uptake, electoral accountability, capture by interests, political redundancy, representativeness, biases, frames2. If a sortition chamber prima facie meets or precludes these different critiques, it represents a striking contribution to democratic innovations beyond mini-publics. That said, we must work out claims 2.), 3.) and 4.) in individual sections below. While examples in 3.) and 4.) will mainly be drawn from the European Union, we maintain that this argument is broadly applicable at local, regional national and transnational levels. We argue that, if institutionalizing consultative mini-publics is desirable and feasible at the EU level, it will be all the more so at other levels throughout the decision-making process’ different stages. [less ▲]

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See detailOptimization ACE inhibition activity in hypertension based on random vector functional link and sine-cosine algorithm
Abd Elaziz, Mohammed; Hemedan, Ahmed; Ostaszewski, Marek UL et al

in Chemometrics and Intelligent Laboratory Systems (2019)

Bioactive peptides from protein hydrolysates with antihypertensive properties have a great effect in health, which warrants their pharmaceutical use. Nevertheless, the process of their production may ... [more ▼]

Bioactive peptides from protein hydrolysates with antihypertensive properties have a great effect in health, which warrants their pharmaceutical use. Nevertheless, the process of their production may affect their efficacy. In this study, we investigate the inhibitory activities of various hydrolysates on angiotensin-converting enzyme (ACE) in relation to the chemical diversity of corresponding bioactive peptides. This depends on the enzyme specificity and process conditions used for the production of hydrolysates. In order to mitigate the uncontrolled chemical alteration in bioactive peptides, we propose a computational approach using the random vector functional link (RVFL) network based on the sine-cosine algorithm (SCA) to find optimal processing parameters, and to predict the ACE inhibition activity. The SCA is used to determine the optimal configuration of RVFL, improving the prediction performance. The experimental results show that the performance measures of the proposed model are better than the state-of-the-art methods. [less ▲]

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See detailMulticenter Alzheimer's and Parkinson's disease immune biomarker verification study
Brosseron, Federic; Schneider, Reinhard UL

in Alzheimer's and Dementia: the Journal of the Alzheimer's Association (2019)

Multiple immunity biomarkers have been suggested as tracers of neuroinflammation in neurodegeneration. This study aimed to verify findings in cerebrospinal fluid (CSF) samples of Alzheimer's disease (AD ... [more ▼]

Multiple immunity biomarkers have been suggested as tracers of neuroinflammation in neurodegeneration. This study aimed to verify findings in cerebrospinal fluid (CSF) samples of Alzheimer's disease (AD) and Parkinson's disease (PD) subjects from the network of the European, Innovative Medicines Initiative–funded project AETIONOMY. [less ▲]

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See detailLuxemburgisch zwischen Variation und Normierung. Ein Einwurf
Purschke, Christoph UL

Article for general public (2019)

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See detailSOCIAL ROLES AND PERSONALITY IN LATER LIFE
Kornadt, Anna Elena UL; Kornadt, Anna Elena UL

in Innovation in Aging (2019), 3(Supplement_1), 729-730

Despite considerable stability of the Big Five personality traits, there is evidence for personality plasticity and change across the lifespan. In younger years, the investment in social roles, such as ... [more ▼]

Despite considerable stability of the Big Five personality traits, there is evidence for personality plasticity and change across the lifespan. In younger years, the investment in social roles, such as entering worklife or starting a family has been shown to drive personality change. With regard to personality in later life, the investigation of social roles has so far been neglected. A questionnaire was developed to assess a large number of social roles that can be assumed in the second half of life. N = 306 participants aged 50 to 86 years reported on their social roles and rated their personality traits. Results show that assuming and investing in certain social roles (e.g. friend, retiree, volunteer) mediated the effects of age on the Big Five, especially for the oldest participants and in the domains openness and extraversion. The findings support the importance of social roles for personality also in later life. [less ▲]

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See detailDeploying Dynamic On-Board Signal Processing Schemes for Multibeam Satellite Systems
Joroughi, Vahid UL; Kibria, Mirza UL; Lagunas, Eva UL et al

in Deploying Dynamic On-Board Signal Processing Schemes for Multibeam Satellite Systems (2019)

This paper designs dynamic on-board signal processing schemes in a multiple gateway multibeam satellite system where full frequency reuse pattern is considered among the beams and feeds. In particular, we ... [more ▼]

This paper designs dynamic on-board signal processing schemes in a multiple gateway multibeam satellite system where full frequency reuse pattern is considered among the beams and feeds. In particular, we deploy on-board Joint Precoding, Feed selection and Signal switching mechanism (JPFS) so that the following advantages are realized, I) No need of Channel State Information (CSI) exchange among the gateways and satellite, since the performance of precoding is highly sensitive to the quality of CSI, II) In case one gateway fails, rerouting signals through other gateways can be applied without any extra signal processing, III) Properly selecting on-board feed/s to serve each user which generates maximum gain toward corresponding user, IV) Flexibly switching the signals received from the gateways to requested users where each user can dynamically request traffic from any gateway, and V) Multiple user with multiple traffic streams can be dynamically served at each beam. However, deploying such JPFS architecture imposes high complexity to the satellite payload. To tackle this issue, this study aims at deploying JPFS that can provide affordable complexity at the payload. In addition, while increasing the data demand imposes extensive bandwidth resources requirement in the feeder link, the proposed JPFS design works efficiently with available feeder link resources even if the data demand increases. The proposed design is evaluated with a close-to-real beam pattern and the latest broadband communication standard for satellite communications. [less ▲]

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See detailATTITUDES TOWARD OWN AGING AND PERSONALITY IN LATER LIFE: EXAMINATION OF BIDIRECTIONALITY OVER 20 YEARS
Kornadt, Anna Elena UL; Siebert, Jelena S.; Wahl, Hans-Werner

in Innovation in Aging (2019), 3(Supplement_1), 385-385

Big Five personality traits are assumed to be linked with attitudes toward own aging (ATOA). Both constructs have central importance for the aging process, it is thus important to comprehensively address ... [more ▼]

Big Five personality traits are assumed to be linked with attitudes toward own aging (ATOA). Both constructs have central importance for the aging process, it is thus important to comprehensively address their mutual connection over time. We used data from the ILSE study, a longitudinal study with four measurement occasions, spanning 20 years and including two participant cohorts (n = 501; born 1950-52 and n = 500; born 1930-32). Dual latent change score models showed that personality was longitudinally related to change in ATOA: Lower Neuroticism, higher Conscientiousness, and higher Openness predicted more positive attitudes; the effect for Extraversion varied by time. Furthermore, the role of personality seems to be confined to certain sensitive periods in midlife and early old age. ATOA had only marginal longitudinal impact on personality. Our results shed light on the developmental co-dynamics of personality and subjective perceptions of aging across the second half of life. [less ▲]

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See detailYOUNG PEOPLE FEEL WISE, OLD PEOPLE FEEL ENERGETIC: COMPARING AGE STEREOTYPES AND SELF-EVALUATIONS ACROSS ADULTHOOD
Kornadt, Anna Elena UL; Bowen, Catherine E.; Spuling, Svenja M. et al

in Innovation in Aging (2019), 3(Supplement_1), 787-787

Using questionnaire data from the MIDUS study (N=6.325) we examined the extent to which people in their late 20s, 40s, and 60s think that positive stereotypic “old” and “young” characteristics describe ... [more ▼]

Using questionnaire data from the MIDUS study (N=6.325) we examined the extent to which people in their late 20s, 40s, and 60s think that positive stereotypic “old” and “young” characteristics describe themselves, their age peers, and other age groups. A constellation of “old” characteristics (e.g., wise, caring, calm) was seen as more descriptive of older adults, while a constellation of “young” characteristics (e.g., healthy, energetic) was seen as more descriptive of younger adults. Self-evaluations were highly positive and largely consistent across age groups. Compared to their age peers, younger adults saw themselves as having as many positive “young” characteristics but more positive “old” characteristics whereas older adults saw themselves as having more positive “young” characteristics but fewer positive “old” characteristics. The results support the stability of the aging self despite the existence of age stereotypes and the role of negative age stereotypes as a frame of reference for making self-evaluations. [less ▲]

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See detailVIEWS ON AGING: NEW PERSPECTIVES FOR THEORY AND RESEARCH
Klusmann, Verena; Kornadt, Anna Elena UL

in Innovation in Aging (2019), 3(Supplement_1), 786-786

Over the past 20 years, research on views on aging has substantiated their importance for successful development and sustained quality of life over the full length of the life span. However, a deep ... [more ▼]

Over the past 20 years, research on views on aging has substantiated their importance for successful development and sustained quality of life over the full length of the life span. However, a deep understanding of the origins of views on aging and the underlying processes of their lifespan development and manifestation is lacking. Since 2017, the scientific network “Images of Aging” funded by the German Research Foundation (http://www.health.uni-konstanz.de/images-of-aging) assembles national and international renowned experts in the field. The network engages in empirical clarifications on both the distinctness and validity of the construct (contribution of Klusmann et al.) as well as in critically reviewing terminology and measures of views on aging (contribution of Notthoff et al.). The network aims to help clarifying the dynamic interplay of determinants and outcomes in the context of health (contribution of Wolff et al.) as well as disentangling intra- and intergenerational stereotypic perceptions (contribution of Kornadt et al.). Both of these are understudied issues with highly practical implications for two of the largest demographic challenges: shaping the coexistence of generations as well as providing adequate health care supply. Integrating both pertinent theoretical approaches and empirical findings the network regards views on aging under a lifespan perspective. Recently, it suggested three core principles of views on aging regarding lifelong bio-psycho-social development, their multidimensional nature, and their impact across life. These considerations provide a background for an integrative discussion of the symposium’s contributions. [less ▲]

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See detailSUBJECTIVE AGING: SOMETHING UNIQUE OR JUST ANOTHER EXPRESSION OF GENERAL SELF-BELIEFS?
Klusmann, Verena; Spuling, Svenja M.; Bowen, Catherine E. et al

in Innovation in Aging (2019), 3(Supplement_1), 786-787

Using data from the German Ageing Survey (adults aged 40‒85), this study tested the convergent and discriminant validity of subjective aging measures by comparing three different measures of subjective ... [more ▼]

Using data from the German Ageing Survey (adults aged 40‒85), this study tested the convergent and discriminant validity of subjective aging measures by comparing three different measures of subjective aging with one another and relating them to established measures of general self-beliefs (optimism, self-efficacy, subjective health) and subjective well-being (depression, affect). Correlations between subjective aging measures ranged from ‒.61 (amongst general self-perceptions of aging measures) to ‒.09, with subjective age being least related to the other measures. The highest overlap was observed between optimism and global self-perceptions of aging (.69) and it was for these global self-perceptions that the highest amount of variance could be explained by correlates in a regression analysis (R-square=.55). In contrast, only 10% of variance could be explained for subjective age. Our results underline the merit of taking the multidimensional nature of subjective aging into account since global measures appear less distinct from general personality traits. [less ▲]

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See detailMit Guerilla zum Prototypen
Rohles, Björn UL

Article for general public (2019)

Little money, little time and still a great user experience? That sounds too good to be true. But the Guerilla-style UX design process promises exactly that. Part 2 of my series on Guerilla-UX is ... [more ▼]

Little money, little time and still a great user experience? That sounds too good to be true. But the Guerilla-style UX design process promises exactly that. Part 2 of my series on Guerilla-UX is dedicated to exploring user needs, brainstorming, and prototyping. [less ▲]

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