A Channel Coding Perspective of Collaborative Filtering

We consider the problem of collaborative filtering from a channel coding perspective. We model the underlying rating matrix as a finite alphabet matrix with block constant structure. The observations are obtained from this underlying matrix through a discrete memoryless channel with a noisy part representing noisy user behavior and an erasure part representing missing data. Moreover, the clusters over which the underlying matrix is constant are {\it unknown}. We establish a sharp threshold result for this model: if the largest cluster size is smaller than $C_1 \log(mn)$ (where the rating matrix is of size $m \times n$), then the underlying matrix cannot be recovered with any estimator, but if the smallest cluster size is larger than $C_2 \log(mn)$, then we show a polynomial time estimator with diminishing probability of error. In the case of uniform cluster size, not only the order of the threshold, but also the constant is identified.Comment: 32 pages, 1 figure, Submitted to IEEE Transactions on Information Theor

Penerapan Perlindungan Hukum Hak Cipta terhadap Seni Batik Riau di Pekanbaru

Indonesia is an archipelago with a variety of art and culture is very rich, the overall wealth of the nation is a potential that needs to be protected. The wealth of art and culture is a source of intellectual property that are given legal protection through legislation. one of the art treasures are protected Indonesian Batik Art. Copyright law protection against Batik Art by Article 12, letter i of Law Number 19 Year 2002 on Copyright. This protection is given as batik art as an intellectual work is a work that has artistic value in the creation of images or motifs or color composition. Wealth of art and culture in every area there in this nation, in addition to useful for the formation of character and dignity of the nation, also can be used to grow the creative economy. Pekanbaru as the capital of Riau province has a variety of art that is steeped in Malay culture, is one of the artistic diversity in creating the famous batik art batik wither. Keywords: Protection, Law, Baik Ria

Pertumbuhan Bibit Generasi M-1 Tanaman Padi Gogo (Oryza Sativa L.) Varietas Lokal dengan Perlakuan Mutagen Ethyl Methane Sulfonate (Ems)

This study aimes of determine the effect of mutagen Ethyl Methane Sulfonate (EMS) on upland local rice (Oryza sativa L.) varieties at generation M-1. This research has been carried out at the Department of Agrotechnology Greenhouse, Faculty of Agriculture, University of Riau, in November to December 2013. The research used factorial Completely Randomized Design consisting of two factors, namely two local rice varieties and five concentrations of mutagens EMS and four replications. The mean deviation between treatments tested by Duncan New Multiple Range Test (DNMRT) at the level of 5%. Parameters observed were time of first tiller appeared, lamina length, midrib length, seedling height, number of leaves, number of tillers, number of life seedling, the number of variegate seedling. Results indicated that the mutagen EMS at a concentration of 1%, reduced the number of first seedling appear, decreasing plant height, number of tillers and total life seeds

Eastern Ghats tragedy: If the mines don’t get them… the dams will

“We hunt the leopard. I can show you how we track them too,” said the Konda Reddi tribal villager. We were at Villarthi village, in a remote forested stretch between the towns of Upper Sileru and Donkarayi in the northern Eastern Ghats of Andhra Pradesh’s Visakhapatnam district. Across the border lay Odisha. Historically this region supported a rich floral diversity, but in recent decades the Eastern Ghats have largely been ignored in favour of other hill regions across India. The rediscovery of the Indian golden gecko Calodactylodes aureus and the Jeypore ground gecko Geckoella jeyporensis, earlier presumed locally extinct has caused some resurgence of public interest, but not enough to make a significant difference. Several researchers have begun to study the faunal diversity of this incredible region, but the hazards confronting this landscape seem almost insurmountable

Efektivitas Pembelajaran Daring di Masa Pandemi COVID 19 Bagi Mahasiswa Universitas PGRI Yogyakarta

Wabah Corona membuat segala hal mengalami perubahan rutinitas, termasuk dalam hal pendidikan. Dulu pembelajaran di perguruan tinggi dilaksanakan secara tatap muka, akan tetapi sekarang pembelajaran harus dilaksanakan secara online. Tujuan penelitian ini adalah untuk mengetahui seberapa besar efektivitas pembelajaran secara daring dimasa pandemi covid 19 bagi mahasiswa Universitas PGRI Yogyakarta. Penelitian ini menggunakan model Kuantitatif dengan metode survei. Responden dari penelitian ini berjumlah 1.000 mahasiswa. Hasil penelitian ini menunjukan bahwa 79% mahasiswa menginginkan pembelajaran secara tatap muka, sedangkan hanya 1% saja mahasiswa yang menginginkan pembelajaran daring, sehingga dapat disimpulkan bahwa pembelajaran daring secara terus menerus selama masa pandemi ini sangat tidak efekti

Building Tolerance Attitudes Of PPKN Students Through Multicultural Education Courses

Abstract. Lately ethnocentric attitudes or understand the area in the college environment are increasing. Discrimination against Sara is still occurring. If this is continued, it will further create division between the nation's children. This research aims to build tolerance among students to create unity and unity through the provision of Multicultural Education courses. This research uses qualitative methods with technical data collection through observation, interviews, documentation, and literacy studies. The results of this study show that multicultural education courses have managed to form a tolerance attitude among students of Pancasila Education and Citizenship of PGRI University Yogyakarta. Student tolerance is reflected in the implementation of lectures in the classroom, during the work of both individuals and groups, and during the implementation of the Final Semester Exam.Keywords: Tolerance; Student; Multicultural EducationAbstrak.  Akhir-akhir ini sikap etnosentris atau faham kedaerahan di lingkungan perguruan tinggi semakin meningkat. Diskriminasi atas sara masih terjadi. Jika hal ini terus menerus dibiarkan akan semakin menimbulkan perpecahan antar anak bangsa. Penelitian ini bertujuan untuk membangun sikap toleransi dikalangan mahasiswa agar terciptanya persatuan dan kesatuan melalui pemberian mata kuliah Pendidikan Multikultural. Penelitian ini menggunakan metode kualitatif dengan tekniik pengumpulan data melalui observasi, wawancara, dokumentasi, dan studi literasi. Hasil penelitian ini menunjukan bahwa mata kuliah Pendidikan Multikultural telah berhasil membentuk sikap toleransi dikalangan mahasiswa Pendidikan Pancasila dan Kewarganegaraan Universitas PGRI Yogyakarta. Sikap toleransi mahasiswa tercermin saat pelaksanaan perkuliahan di kelas, saat pengerjaan tugas baik individu maupun kelompok, dan pada saat pelaksanaan Ujian Akhir Semester.Kata Kunci: Toleransi; Mahasiswa; Pendidikan Multikultura