488 research outputs found
Positivity Bias in Customer Satisfaction Ratings
Customer ratings are valuable sources to understand their satisfaction and
are critical for designing better customer experiences and recommendations. The
majority of customers, however, do not respond to rating surveys, which makes
the result less representative. To understand overall satisfaction, this paper
aims to investigate how likely customers without responses had satisfactory
experiences compared to those respondents. To infer customer satisfaction of
such unlabeled sessions, we propose models using recurrent neural networks
(RNNs) that learn continuous representations of unstructured text conversation.
By analyzing online chat logs of over 170,000 sessions from Samsung's customer
service department, we make a novel finding that while labeled sessions
contributed by a small fraction of customers received overwhelmingly positive
reviews, the majority of unlabeled sessions would have received lower ratings
by customers. The data analytics presented in this paper not only have
practical implications for helping detect dissatisfied customers on live chat
services but also make theoretical contributions on discovering the level of
biases in online rating platforms.Comment: This paper will be presented at WWW'18 conferenc
Ecofisiologia da germinação de Lavandula luisieri (Roseira) Rivaz-MartĂnez
A capacidade germinativa de Lavandula luisieri (Rozeira) Rivas-MartĂnez,
espĂ©cie endĂ©mica da PenĂnsula IbĂ©rica, pertencente Ă famĂlia Lamiaceae, cujos
diĂĄsporos foram colhidas em quatro locais da Beira Interior-Portugal (Casal da Fraga,
Mata, Penamacor e Vila Velha de RĂłdĂŁo), foi avaliada durante dois anos.
Sementes conservadas durante diferentes tempos apĂłs colheita, foram ensaiadas
em condiçÔes controladas de temperatura e luz. As modalidades seleccionadas foram:
para um tempo de conservação de 40 dias a temperatura contĂnua de 25ÂșC e fotoperĂodo
de 16h e para a alternĂąncia de 8Âș/18ÂșC o fotoperĂodo de 8h que coincidiu com a
temperatura mais elevada; para um tempo de conservação de 75 dias, a temperatura
contĂnua de 25ÂșC e os fotoperĂodos de 8h e 16h; para um tempo de conservação de 110
dias a alternĂąncia de 8Âș/18ÂșC e fotoperĂodo de 8h; para um tempo de conservação de 288
dias, a alternĂąncia de 8Âș/18ÂșC e fotoperĂodo de 8h e a temperatura contĂnua de 25ÂșC e
um fotoperĂodo de 16h.
Os resultados confirmam que as condiçÔes de Outono (temperaturas alternas de
8Âș/18ÂȘC ) foram as mais adequadas para a germinação desta espĂ©cie durante os
diferentes tempos de conservação
Avaliação do curso de Engenharia de das CiĂȘncias AgrĂĄrias - Opção Engenharia Rural
O presente relatĂłrio resulta do trabalho de avaliação ao curso de Engenharia das CiĂȘncias AgrĂĄrias opção Engenharia Rural levado a cabo pela equipa de Auto-Avaliação da Escola Superior AgrĂĄria. Esta equipa, designada pelo conselho cientĂfico com a finalidade de proceder a todas as solicitaçÔes de avaliação tanto dos cursos como da instituição, Ă© basicamente composta por um coordenador e um elemento de cada unidade departamental. Conforme o curso que se estĂĄ a avaliar juntam-se Ă equipa o respectivo coordenador de curso e colaboradores na compilação do relatĂłrio. AlĂ©m destes elementos participaram tambĂ©m neste trabalho um representante dos alunos (designado pela associação de estudantes) e dois funcionĂĄrios representantes do pessoal administrativo e do pessoal nĂŁo docente. Em termos metodolĂłgicos optou-se pelo seguimento mais ou menos fiel do guiĂŁo proposto pelo CNAVES, tendo-se recolhido informação de diversos modos: pesquisa documental e bases de dados nos serviços administrativos, inquĂ©ritos auto administrados a alunos, docentes e funcionĂĄrios, inquĂ©rito postal aos diplomados e entrevistas directas (por telefone) Ă s entidades empregadoras. Uma vez recolhida e tratada a informação procedeu-se Ă sua anĂĄlise crĂtica tendo como referĂȘncia os trabalhos de avaliação que atĂ© entĂŁo decorreram relativamente na Escola
Soil cover plants on water erosion control in the South of Minas Gerais
Water erosion is responsible for soil, water, carbon and nutrient losses, turning into the most important type of degradation of Brazilian soils. This study aimed to evaluate the influence of three cover plants under two tillage systems on water erosion control in an Argisol at south of Minas Gerais state, Brazil. The cover plants utilized in the study were pigeon pea, jack bean and millet, under contour seeding and downslope tillage. Experimental plots of 4 x 12 m, with 9% slope, under natural rainfall were used for the quantification of losses of soil, water, nutrients, and organic matter. One experimental plot was kept without plant cover (reference). Higher erosivity was observed in December and January, although a great quantity of erosive rainfall was detected during the whole raining period. Contour seeding provided a greater reduction of water erosion than downslope tillage, as expected. The jack bean under contour seeding revealed the lowest values of soil, water, nutrients and organic matter losses
Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV
Results are presented from a search for a W' boson using a dataset
corresponding to 5.0 inverse femtobarns of integrated luminosity collected
during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV.
The W' boson is modeled as a heavy W boson, but different scenarios for the
couplings to fermions are considered, involving both left-handed and
right-handed chiral projections of the fermions, as well as an arbitrary
mixture of the two. The search is performed in the decay channel W' to t b,
leading to a final state signature with a single lepton (e, mu), missing
transverse energy, and jets, at least one of which is tagged as a b-jet. A W'
boson that couples to fermions with the same coupling constant as the W, but to
the right-handed rather than left-handed chiral projections, is excluded for
masses below 1.85 TeV at the 95% confidence level. For the first time using LHC
data, constraints on the W' gauge coupling for a set of left- and right-handed
coupling combinations have been placed. These results represent a significant
improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe
Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV
A search for a Higgs boson decaying into two photons is described. The
analysis is performed using a dataset recorded by the CMS experiment at the LHC
from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an
integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross
section of the standard model Higgs boson decaying to two photons. The expected
exclusion limit at 95% confidence level is between 1.4 and 2.4 times the
standard model cross section in the mass range between 110 and 150 GeV. The
analysis of the data excludes, at 95% confidence level, the standard model
Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The
largest excess of events above the expected standard model background is
observed for a Higgs boson mass hypothesis of 124 GeV with a local significance
of 3.1 sigma. The global significance of observing an excess with a local
significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is
estimated to be 1.8 sigma. More data are required to ascertain the origin of
this excess.Comment: Submitted to Physics Letters
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