Security Estimates for Quadratic Field Based Cryptosystems

We describe implementations for solving the discrete logarithm problem in the class group of an imaginary quadratic field and in the infrastructure of a real quadratic field. The algorithms used incorporate improvements over previously-used algorithms, and extensive numerical results are presented demonstrating their efficiency. This data is used as the basis for extrapolations, used to provide recommendations for parameter sizes providing approximately the same level of security as block ciphers with $80,$ $112,$ $128,$ $192,$ and $256$-bit symmetric keys

Evaluation of Long-Term Care Workforce/Community Partnerships Model

CPACS Urban Research Awards Part of the mission of the College of Public Affairs and Community Service (CPACS) is to conduct research, especially as it relates to concerns of our local and statewide constituencies. CPACS has always had an urban mission, and one way that mission is served is to preform applied research relevant to urban society in general, and the Omaha metropolitan area and other Nebraska urban communities in particular. Beginning in 2014, the CPACS Dean provided funding for the projects with high relevance to current urban issues, with the potential to apply the findings to practice in Nebraska, Iowa, and beyond

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

The use of calcined kaolin (CK) as a cementitious material in construction has attracted the interest of various researchers due to its environmental, mechanical, and physical qualities, all of which contribute to the lowering of cement usage. Studies have reported numerous problems associated with its use in concrete, apart from the ecological benefit that CK can provide. For instance, there is an issue of increased water demand due to smaller particle size, which generates much more heat in concrete, which has a detrimental effect on the mechanical and physical properties of concrete. This paper presents the analysis of an investigation aimed at using gum Arabic (GA) as a biopolymer admixture and calcined kaolin as a partial replacement of cement to improve the mechanical properties and durability of concrete. GA proportions ranged from 0 to 1% by weight of cement. Calcined kaolin (CK) was used to replace 5, 10, 15, 20, 25, and 30% of the cement content, respectively. Compressive strength, splitting tensile strength, density, strength loss, and weight loss tests were all performed to validate the structural performance of the modified concrete. The compressive tests, performed after 28 days from the time the mixture was made, demonstrated that the maximum percentage of CK that could replace cement without affecting the mechanical properties of concrete was 20%. Beyond 20%, concrete does not exhibit good compressive strength properties. The results also revealed decreased compressive strength and splitting tensile strength tests as the percentage of CK increased. After 56 days, compressive strength at 5% CK and 10% CK increased slightly by 0.743% and 1.162 %, respectively, compared to the control sample. The inclusion of 0.8%GA increased the compressive strength by 8.94% compared to the control sample (0%CK + 0%GA + 100%OPC) after 56 days. The results of durability tests showed that 0.6% GA had a higher compressive strength than other percentages containing GA. Doi: 10.28991/CEJ-2022-08-05-010 Full Text: PD

Sistem Peringatan Dini Pemantauan Tanah Longsor Berbasis Teknologi Vision dan Geomatika

Makalah ini akan memaparkan pengembangan sistem peringatan dini untuk pemantauan tanah longsor berbasis teknologi spasial kebumian. sistem yang dikembangkan memanfaatkan basis data spasial dan penginderaan berbasis optik untuk secara terus menerus memantau area yang dicurigai berpotensi longsor. Jika terjadi guguran massa tanah pada area longsor, sistem akan secara otomatis dan real time mengirimkan sinyal tanda bahaya ke perangkat handphone. Sistem ini memiliki dua komponen utama, komponen penginderaan berbasis optik dan komponen sistem informasi geografis sebagai penyedia basis data spasial area longsor. Komponen penginderaan kamera CCTV dan circuit terintegrasi yang diinjeksikan dengan dengan program optical flow untuk mendeteksi pergerakan massa tanah. Jika pergerakan massa tanah yang terjadi dapat dideteksi, maka gambar yang terekam akan dianalisa secara spasial dengan komponen yang kedua yaitu sistem informasi geografis yang dibangun dengan pemotretan udara mengguakan UAV dan sistem ini yang akan menentukan apakah pergerakan tanah yang terdeteksi berpotensi pemicu tanah longsor atau tidak

Sistem Peringatan Dini Pemantauan Tanah Longsor Berbasis Teknologi Vision dan Geomatika

Makalah ini akan memaparkan pengembangan sistem peringatan dini untuk pemantauan tanah longsor berbasis teknologi spasial kebumian. sistem yang dikembangkan memanfaatkan basis data spasial dan penginderaan berbasis optik untuk secara terus menerus memantau area yang dicurigai berpotensi longsor. Jika terjadi guguran massa tanah pada area longsor, sistem akan secara otomatis dan real time mengirimkan sinyal tanda bahaya ke perangkat handphone. Sistem ini memiliki dua komponen utama, komponen penginderaan berbasis optik dan komponen sistem informasi geografis sebagai penyedia basis data spasial area longsor. Komponen penginderaan kamera CCTV dan circuit terintegrasi yang diinjeksikan dengan dengan program optical flow untuk mendeteksi pergerakan massa tanah. Jika pergerakan massa tanah yang terjadi dapat dideteksi, maka gambar yang terekam akan dianalisa secara spasial dengan komponen yang kedua yaitu sistem informasi geografis yang dibangun dengan pemotretan udara mengguakan UAV dan sistem ini yang akan menentukan apakah pergerakan tanah yang terdeteksi berpotensi pemicu tanah longsor atau tidak

PEMANFAATAN LIMBAH ABU TERBANG YANG RAMAH LINGKUNGAN SEBAGAI BAHN STABILISASI TANAH DASAR

ABSTRAK Salah satu penaganan lingkungan yang dapat diterapkan adalah memanfaatkan limbah abu terbang batu bara dan kapur untuk keperluan material infrastruktur bidang jalan. Berdasarkan Peraturan Pemerintah no. 85 Tahun 1999  tentang Perubahan Atas Peraturan Pemerintah no. 18 Tahun 1999 Tentang Pengelolaan Limbah Bahan Berbahaya dan Beracun (B3), abu terbang dikategorikan sebagai limbah B3, sehingga dalam pemanfaatannya perlu diperhatikan disamping aspek teknis juga dari aspek lingkungan. Pengujian Laboraturium yang meliputi pengujian laboraturium fisik stabilisasi tanah dengan abu terbang dan pengujian laboraturium Analisis Kandungan Kimia dan Uji TCLP (Toxicity Characteristic Leach at Procodure) dari abu terbang. Metode pengujian kimia dan TCLP dengan metode uji alat AAS (atomic absorbtion speactrofotometric). Penambahan abu terbang dapat meningkatkan nilai CBR tanah. Peningkatan maksiumum terjadi pada penambahan abu terbang 20% dan penambahan 5% kapur dapat meningkatkan nilai CBR campuran tanah dan abu terbang. Hasil kajian lingkungan terhadap pemanfaatan limbah abu terbang adalah : berdasarkan aturan yang berlaku, tempat penimbunan untuk pengelolaan abu terbang di Landfill kategori II (Secure Landfill Single Liner). Hasil Uji TCLP menunjukan bahwa untuk semua kandungan logam beratnya masih dibawah baku mutu standar Lingkungan Hidup dan masih dikategorikan tidak berbahaya (non hazardous materials).Kata kunci : Lingkungan Hidup, limbah B3, abu terbang, stabilisasi tanah, material tidak berbahay

Lean and CSR, contradictions and complementarities: Toward an effective managerial solution

International audienceLean management is a way for companies to improve their productivity and bring down their costs. Corporate Social Responsibility (CSR) aims to meet the expectations of stakeholders concerning a company’s impact on the environment and society. Despite their importance, and sometimes their coexistence, companies tend to tackle these two approaches separately. In this study, which employs a qualitative survey of seven companies, we attempt to understand the synergies and possible contradictions between Lean and CSR approaches. Firstly, it is clear that Lean, like CSR, concerns the economy, the environment, and stakeholder relations. Secondly, when combined, these two approaches compensate for their respective shortfalls: Lean management makes it possible to justify CSR on economic and financial levels, and provides CSR with a rigorous methodology in terms of operational management. CSR brings Lean management a way to consolidate its social and environmental benefits, and brings meaning that fosters employee engagement and extends the intervention scope of Lean to external stakeholders. This study also highlights a common key success factor, i.e., a corporate culture aimed at excellence. On this basis, the study recommends the combined implementation of both approaches in order to maximize their respective benefits. Seen from this perspective, CSR could be considered as continuous improvement of the company’s overall performance, the first step of which would be Lean