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Université de Fribourg

It Takes Two : Instrumenting the Interaction between In-Memory Databases and Solid-State Drives

Lerner, Alberto ; Kwak, Jaewook ; Lee, Sangjin ; Park, Kibin ; Song, Yong Ho ; Cudré-Mauroux, Philippe

In: CIDR 2020, 10th Conference on Innovative Data Systems Research, Amsterdam, The Netherlands, January 12-15, 2020, Online Proceedings, 2020, p. 1-8

In-memory databases rely on non-volatile storage devices for services such as durability and recovery. SSDs can provide the high-performance these services require. When performance problems occur, however, SSDs offer no mechanism to help analyze them. The only alternative is to instrument the database side of the problem and conjecture about what might be the cause of performance...

Université de Fribourg

Networking and Storage : The Next Computing Elements in Exascale Systems?

Lerner, Alberto ; Hussein, Rana ; Ryser, André ; Lee, Sangjin ; Cudré-Mauroux, Philippe

In: IEEE Data Engineering Bulletin, 2020, vol. 43, no. 1, p. 60-71

Many large computer clusters offer alternative computing elements in addition to general-purpose CPUs. GPU and FPGAs are very common choices. Two emerging technologies can further widen the options in that context: in-network computing (INC) and near-storage processing (NSP). These technologies support computing over data that is in transit between nodes or inside the storage stack,...

Université de Fribourg

In situ deprotection of polymeric binders for solution‐processible sulfide‐based all‐solid‐state batteries

Lee, Jieun ; Lee, Kyulin ; Lee, Taegeun ; Kim, Hyuntae ; Kim, Kyungsu ; Cho, Woosuk ; Coskun, Ali ; Char, Kookheon ; Choi, Jang Wook

In: Advanced Materials, 2020, p. 2001702

Sulfide‐based all‐solid‐state batteries (ASSBs) have been featured as promising alternatives to the current lithium‐ion batteries (LIBs) mainly owing to their superior safety. Nevertheless, a solution‐based scalable manufacturing scheme has not yet been established because of the incompatible polarity of the binder, solvent, and sulfide electrolyte during slurry preparation. This...

Université de Fribourg

Microphysics and dynamics of snowfall associated with a warm conveyor belt over Korea

Gehring, Josué ; Oertel, Annika ; Vignon, Étienne ; Jullien, Nicolas ; Besic, Nikola ; Berne, Alexis

In: Atmospheric Chemistry and Physics, 2020, vol. 20, no. 12, p. 7373–7392

On 28 February 2018, 57 mm of precipitation associated with a warm conveyor belt (WCB) fell within 21 h over South Korea. To investigate how the large-scale circulation influenced the microphysics of this intense precipitation event, we used radar measurements, snowflake photographs and radiosounding data from the International Collaborative Experiments for Pyeongchang 2018 Olympic and...

Université de Fribourg

A new species of baenid turtle from the Early Cretaceous Lakota Formation of South Dakota

Joyce, Walter G. ; Rollot, Yann ; Cifelli, Richard L.

In: Fossil Record, 2020, vol. 23, no. 1, p. 1–13

Baenidae is a clade of paracryptodiran turtles known from the late Early Cretaceous to Eocene of North America. The proposed sister-group relationship of Baenidae to Pleurosternidae, a group of turtles known from sediments dated as early as the Late Jurassic, suggests a ghost lineage that crosses the early Early Cretaceous. We here document a new species of paracryptodiran turtle, Lakotemys...

Université de Fribourg

The Korea discount and chaebols

Ducret, Romain ; Isakov, Dušan

(Working Papers SES ; 511)

Finance practitioners frequently claim that stocks of Korean firms are undervalued and trade at a discount relative to foreign firms. This phenomenon is commonly called «the Korea discount». It is based on anecdotal evidence comparing either the price- earnings ratios of different market indexes or those of different individual stocks. This paper provides empirical evidence on the existence...

Université de Fribourg

Colloidal dynamics and elasticity of dense wax particle suspensions over a wide range of volume fractions when tuning the softness by temperature

Yoon, Jiwon ; Scheffold, Frank ; Ahn, Kyung Hyun

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019, vol. 576, p. 1–8

We report on the colloidal dynamics and rheology of liquid droplet emulsions and solid particle suspensions over a wide range of volume fractions. Diffusing wave spectroscopy and rheometry were utilized to study the micro/macroscale properties of 1-eicosene wax particles dispersed in water. By changing the temperature, the wax droplets change their properties from soft to hard or vice versa,...

Université de Fribourg

A systematic review on the possible relationship between bilingualism, cognitive decline, and the onset of dementia

Noort, Maurits Van den ; Vermeire, Katrien ; Bosch, Peggy ; Staudte, Heike ; Krajenbrink, Trudy ; Jaswetz, Lars ; Struys, Esli ; Yeo, Sujung ; Barisch, Pia ; Perriard, Benoît ; Lee, Sook-Hyun ; Lim, Sabina

In: Behavioral Sciences, 2019, vol. 9, no. 7, p. 81

A systematic review was conducted to investigate whether bilingualism has a protective effect against cognitive decline in aging and can protect against dementia. We searched the Medline, ScienceDirect, Scopus, and ERIC databases with a cut-off date of 31 March 2019, thereby following the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) protocol....

Université de Fribourg

Advances in porous organic polymers for efficient water capture

Byun, Yearin ; Je, Sang Hyun ; Talapaneni, Siddulu Naidu ; Coskun, Ali

In: Chemistry – A European Journal, 2019, vol. 25, no. 44, p. 10262–10283

Desiccant driven dehumidification for maintaining the proper humidity levels and atmospheric water capture with minimum energy penalty are important aspects in heat pumps, refrigeration, gas and liquid purifications, gas sensing, and clean water production for improved human health and comfort. Water adsorption by using nanoporous materials has emerged as a viable alternative to...

Université de Fribourg

Highly elastic polyrotaxane binders for mechanically stable lithium hosts in lithium‐metal batteries

Yoo, Dong‐Joo ; Elabd, Ahmed ; Choi, Sunghun ; Cho, Yunshik ; Kim, Jaemin ; Lee, Seung Jong ; Choi, Seung Ho ; Kwon, Tae‐woo ; Char, Kookheon ; Kim, Ki Jae ; Coskun, Ali ; Choi, Jang Wook

In: Advanced Materials, 2019, vol. 31, no. 29, p. 1901645

Despite their unparalleled theoretical capacity, lithium‐metal anodes suffer from well‐ known indiscriminate dendrite growth and parasitic surface reactions. Conductive scaffolds with lithium uptake capacity are recently highlighted as promising lithium hosts, and carbon nanotubes (CNTs) are an ideal candidate for this purpose because of their capability of percolating a conductive...