513,091 research outputs found
Search Rank Fraud De-Anonymization in Online Systems
We introduce the fraud de-anonymization problem, that goes beyond fraud
detection, to unmask the human masterminds responsible for posting search rank
fraud in online systems. We collect and study search rank fraud data from
Upwork, and survey the capabilities and behaviors of 58 search rank fraudsters
recruited from 6 crowdsourcing sites. We propose Dolos, a fraud
de-anonymization system that leverages traits and behaviors extracted from
these studies, to attribute detected fraud to crowdsourcing site fraudsters,
thus to real identities and bank accounts. We introduce MCDense, a min-cut
dense component detection algorithm to uncover groups of user accounts
controlled by different fraudsters, and leverage stylometry and deep learning
to attribute them to crowdsourcing site profiles. Dolos correctly identified
the owners of 95% of fraudster-controlled communities, and uncovered fraudsters
who promoted as many as 97.5% of fraud apps we collected from Google Play. When
evaluated on 13,087 apps (820,760 reviews), which we monitored over more than 6
months, Dolos identified 1,056 apps with suspicious reviewer groups. We report
orthogonal evidence of their fraud, including fraud duplicates and fraud
re-posts.Comment: The 29Th ACM Conference on Hypertext and Social Media, July 201
The relationship between social rank and spatial learning in pheasants, Phasianus colchicus: Cause or consequence? (article)
This is the final version. Available from PeerJ via the DOI in this record.The dataset associated with this article is in ORE: https://doi.org/10.24378/exe.143Individual differences in performances on cognitive tasks have been found to differ according to social rank across multiple species. However, it is not clear whether an individual's cognitive performance is flexible and the result of their current social rank, modulated by social interactions (social state dependent hypothesis), or if it is determined prior to the formation of the social hierarchy and indeed influences an individual's rank (prior attributes hypothesis). We separated these two hypotheses by measuring learning performance of male pheasants, Phasianus colchicus, on a spatial discrimination task as chicks and again as adults. We inferred adult male social rank from observing agonistic interactions while housed in captive multi-male multi-female groups. Learning performance of adult males was assayed after social rank had been standardised; by housing single males with two or four females. We predicted that if cognitive abilities determine social rank formation we would observe: consistency between chick and adult performances on the cognitive task and chick performance would predict adult social rank. We found that learning performances were consistent from chicks to adults for task accuracy, but not for speed of learning and chick learning performances were not related to adult social rank. Therefore, we could not support the prior attributes hypothesis of cognitive abilities aiding social rank formation. Instead, we found that individual differences in learning performances of adults were predicted by the number of females a male was housed with; males housed with four females had higher levels of learning performance than males housed with two females; and their most recent recording of captive social rank, even though learning performance was assayed while males were in a standardized, non-competitive environment. This does not support the hypothesis that direct social pressures are causing the inter-individual variation in learning performances that we observe. Instead, our results suggest that there may be carry-over effects of aggressive social interactions on learning performance. Consequently, whether early life spatial learning performances influence social rank is unclear but these performances are modulated by the current social environment and a male's most recent social rank.European Research Counci
The Development of Learning Media in Digital Technique Subject based on Computer
This paper provides the information about how to develop the learning media in Digital
Technique subject based on multimedia computer at Educational Electrical Engineering Department, Yogyakarta State University. There are four stages that should be completed to develop learning media based on computer, usually it is called software engineering, that it can described as follows: 1) user needs analysis, 2) designing of learning media, 3) implementation or coding, 4) testing and knowing the feasibility of learning media. According to software testing by using Black Box testing method, all of the function in the learning media was able to run well in accordance with program specifications on user need analysis. The feasibility of learning media was measured by 3 groups, the first is students that achieve 3.23 score in 4 scale rank, the second group is media experts that assess the learning media on 2.64 score in 3 scale rank, and the last group is material experts that provide the score 2.73 in 3 scale rank.
According to the assessment from students, media experts and material experts, the learning media that was developed is feasible to use in Digital Technique subject
Group social rank is associated with performance on a spatial learning task (article)
This is the final published version. Available from the Royal Society via the DOI in this record.The dataset associated with this article is located in ORE at: http://hdl.handle.net/10871/30840Dominant individuals differ from subordinates in their performances on cognitive tasks across a suite of taxa. Previous studies often only consider dyadic relationships, rather than the more ecologically relevant social hierarchies or networks, hence failing to account for how dyadic relationships may be adjusted within larger social groups. We used a novel statistical method: randomized Elo-ratings, to infer the social hierarchy of 18 male pheasants, Phasianus colchicus, while in a captive, mixed-sex group with a linear hierarchy. We assayed individual learning performance of these males on a binary spatial discrimination task to investigate whether inter-individual variation in performance is associated with group social rank. Task performance improved with increasing trial number and was positively related to social rank, with higher ranking males showing greater levels of success. Motivation to participate in the task was not related to social rank or task performance, thus indicating that these rank-related differences are not a consequence of differences in motivation to complete the task. Our results provide important information about how variation in cognitive performance relates to an individual's social rank within a group. Whether the social environment causes differences in learning performance or instead, inherent differences in learning ability predetermine rank remains to be tested.ERC Consolidator Award (616474) to J.R.M
PENGEMBANGAN MODUL GNS3 SEBAGAI MEDIA PEMBELAJARAN UNTUK MENINGKATKAN KEMAMPUAN SISWA DALAM KONFIGURASI DHCP SERVER PADA MATA PELAJARAN ADMINISTRASI SISTEM JARINGAN
Abstrak Penelitian ini merupakan penelitian pengembangan modul aplikasi GNS3 untuk konfigurasi DHCP Server. Tujuan dari penelitian ini adalah untuk mengetahui hasil belajar siswa dari penggunaan aplikasi GNS3 dan mengetahui kevalidan modul ajar dengan menggunakan aplikasi GNS3 untuk pembelajaran dalam kelas. Metode penelitian yang digunakan dalam penelitian ini adalah Quasi Experimental Design dengan desain penelitian The Matching-Only Posttest-Only Control Group Design. The Matching-Only Posttest-Only Control Group Design menggunakan 2 kelompok yang dipilih tidak secara acak. Kelompok eksperimen diberikan perlakuan khusus dan kelompok kontrol yang diberikan pembelajaran seperti biasa. Setelah pemberian perlakuan terhadap kedua kelompok, maka kedua kelompok akan diberikan posttest untuk mengetahui hasil belajar kedua kelompok. Subjek penelitian ini dilakukan pada siswa SMK Negeri 1 Kemlagi kelas XI TKJ yang menempuh mata pelajaran Administrasi Sistem Jaringan. Berdasarkan hasil penelitian yang didapat dari uji Mann-Whitney yang digunakan dalam penelitian ini yaitu kelompok eksperimen dengan tes kognitif mendapatkan mean rank 35.04 dan kelas kontrol mendapatkan mean rank 25.00 dengan sig. 0.024 < 0.05. pada hasil tes psikomotorik kelas eksperimen mendapatkan mean rank 42.73 dan kelas kontrol mendapatkan 18.75 dengan sig. 0.000 < 0.05. Hasil validasi modul terhadap validator mendapatkan hasil 88.64%. Hal ini dapat disimpulkan bahwa kelompok eksperimen yang telah diberikan perlakuan menggunakan modul aplikasi GNS3 mendapatkan hasil belajar lebih baik dibandingkan hasil kelas kontrol dan modul aplikasi GNS3 memiliki keterbacaan modul yang sangat valid dari para validator. Kata Kunci: GNS3, DHCP Server, Quasi Experimental Design, The Matching-Only Posttest-Only Control Group Design, Hasil Belajar AbstractThis research is a research on the development of GNS3 application module for DHCP Server configuration. The purpose of this research is to determine student learning outcomes from the use of GNS3 applications and find out the validity of teaching modules by using the GNS3 application for classroom learning. The research of method design used in this research is Quasi Experimental Design with The Matching-Only Posttest-Only Control Group Design research design. The Matching-Only Posttest-Only Control Group Design uses 2 groups that are selected not randomly. The experimental group is given special treatment and the control group is given learning as usual. After giving treatment to both groups, then both groups will be given a posttest to find out the learning outcomes of the two groups. The subject of this research is conducted on students of SMK Negeri 1 Kemlagi in class XI TKJ who took Network System Administration lesson. Based on the results of the study obtained from the Mann-Whitney test used in this study, the experimental group with cognitive tests get mean rank 35.04 and control class get mean rank 25.00 with sig. 0.024 < 0.05. In the psychomotor test results the experimental class gets mean rank of 42.73 and the control class gets mean rank 18.75 with sig. 0.000 < 0.05. The results of module validation against the validator get 88.64%. It can be concluded that the experimental group that has been given treatment using the GNS3 application module gets better learning outcomes than the control class learning outcomes and GNS3 application module has a very valid module readability from the validator.Keywords: GNS3, DHCP Server, Quasi Experimental Design, The Matching-Only Posttest-Only Control Group Design, Learning Outcomes
Structured sparsity-inducing norms through submodular functions
Sparse methods for supervised learning aim at finding good linear predictors
from as few variables as possible, i.e., with small cardinality of their
supports. This combinatorial selection problem is often turned into a convex
optimization problem by replacing the cardinality function by its convex
envelope (tightest convex lower bound), in this case the L1-norm. In this
paper, we investigate more general set-functions than the cardinality, that may
incorporate prior knowledge or structural constraints which are common in many
applications: namely, we show that for nondecreasing submodular set-functions,
the corresponding convex envelope can be obtained from its \lova extension, a
common tool in submodular analysis. This defines a family of polyhedral norms,
for which we provide generic algorithmic tools (subgradients and proximal
operators) and theoretical results (conditions for support recovery or
high-dimensional inference). By selecting specific submodular functions, we can
give a new interpretation to known norms, such as those based on
rank-statistics or grouped norms with potentially overlapping groups; we also
define new norms, in particular ones that can be used as non-factorial priors
for supervised learning
ROUND TABLE COOPERATIVE LEARNING TOWARDS STUDENTS’ CONCEPT MASTERY AND SCIENCE ANXIETY IN LEARNING GLOBAL WARMING
Government choose cooperative learning as the strategy to gain concept mastery because of its student-centered activities. However, cooperative learning affect students’ anxiety because they should have some interactions. There are so many types of cooperative learning, but Round Table is only used to learn language. So, this research investigated the effect of Round Table to students’ concept mastery and science anxiety in learning global warming. In line with this objective, for the research, 48 7th grade students from one junior high school in Bandung were chosen into 2 groups, 24 students into experiment group with implementing Round Table and 26 students into control group with lecturing method. Pretest, post test, and science anxiety questionnaire were used as the data collection tools. The data analysis indicated that the students in the experiment groups showed greater gain of concept mastery than control group with N-Gain score from experiment group is 40.03 which categorized as medium improvement and control group is 18.2 which categorized as low improvement. But there is no significant difference between two group in science anxiety. Experiment group had an average rank of 25.56, while control had an average rank of 25.44. Therefore, Round Table is recommended to be used in learning global warming especially had a good implementation in grouping and writing stage to gain students’ concept mastery, but there is needed continues research to decrease science anxiety
Peran Kelompok Tani Terhadap Produksi Durian di Desa Kaligono Kecamatan Kaligesing Kabupaten Purworejo
This study aims to: (1) Determine the role of farmer groups on durian production in Kaligono village, Kaligesing sub-district, Purworejo district. (2) Determine the relationship of the role of farmer groups to durian production in Kaligono village, Kaligesing sub-district, Purworejo district. The research design used in the study is a survey method. The study population of all durian farmers who are members of farmer groups in the village of Kaligono, Kaligesing district, Purworejo district, amounting to 262 farmers. The sample of respondents studied was 73 durian farmers determined using the Simple Random Sampling method. Data collection instruments using questionnaires, analysis using Likert scale, and Rank Spearman. The results showed that based on the results of the analysis using the Likert scale, the overall role of farmer groups in durian production obtained an average score of 25.58, which means it was included in the medium category, where the role of each farmer group in durian production was the role of farmer groups as learning units and cooperation units fall into the medium category with percentages of 35% and 37%, while the role of farmer groups as production units falls into the low category with a percentage of 28%. The results of the analysis with Rank Spearman, it is known that there is a significant relationship between the role of farmer groups as a unit of cooperation with the close relationship that is quite strong and there is no significant relationship between the role of farmer groups as learning units and production units
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