Author Archives: te-bachi

Software Defined Radio (SDR)

Hands On: Cheap Software Defined Radio, AliExpress, Raspberry Pi

RTL.SDR 2832U + R820T2 0.1MHz-1.7GHz TCXO ADSB UHF VHF HF FM USB Tuner Receiver
RTL2832U+R820T2 100KHz-1.7GHz UHF VHF HF RTL.SDR USB Tuner Receiver AM FM Radio
RTL-SDR Blog RTL SDR V3 R820T2 RTL2832U 1PPM TCXO SMA RTLSDR Software Defined Radio with Multipurpose Dipole Antenna
Drop Ship&Wholesale RTL-SDR Blog V3 RTL2832U 1PPM TCXO HF BiasT SMA Software Defined Radio APR28
RTL-SDR Blog RTL SDR V3 R820T2 RTL2832U 1PPM TCXO SMA RTLSDR Software Defined Radio (Dongle Only)
RTL-SDR Blog V3 RTL2832U 1PPM TCXO HF BiasT SMA Software Defined Radio

Neox

HDC-300/ HD-M285 Manual (PDF)

HD-M330, MTB – Hydraulic Disc Brake System
MD-M300 [CN], MTB – Mechanical Disc Brake System
HD-M285 / M286, MTB – Hydraulic Disc Brake System

HDC-300/ HD-M285 calipers use A10.11 / E10.11 brake pads.

Bremsbelag Tektro E10.11 Paar mit Feder
Park Tool Bremsbelag Richtwerkzeug PP-1.2

YouTube

Ремонт . Устраняем течь калипера Tektro HDC 330
Tektro HDC-300 Bleed Instructions
Tektro Hydraulic Disc Brake Bleed Instructions
Scheibenbremse Bremsbeläge wechseln – so geht’s richtig
Wann sind BREMSBELÄGE ABGEFAHREN? – Quick Tipps – Fahrrad.org
Bremssattel am Fahrrad ausrichten – Bremsen schleiffrei einstellen – ausführlich mit Zusatzinfos

Framing / Datenpaket / Datenframe

Ethernet
Non Return to Zero (NRZ)
Datenframe
Datenpaket
Point-to-Point Protocol (PPP)
High-Level Data Link Control (HDLC)

Asynchronous framing

Instead asynchronous framing uses “control-octet transparency”, also called “byte stuffing” or “octet stuffing”. The frame boundary octet is 01111110, (0x7E in hexadecimal notation). A “control escape octet”, has the value 0x7D (bit sequence ‘10111110’, as RS-232 transmits least-significant bit first). If either of these two octets appears in the transmitted data, an escape octet is sent, followed by the original data octet with bit 5 inverted. For example, the byte 0x7E would be transmitted as 0x7D 0x5E (“10111110 01111010”). Other reserved octet values (such as XON or XOFF) can be escaped in the same way if necessary.

The “abort sequence” 0x7D 0x7E ends a packet with an incomplete byte-stuff sequence, forcing the receiver to detect an error. This can be used to abort packet transmission with no chance the partial packet will be interpreted as valid by the receiver.

FTP_TheoComp

Komplexitätstheorie
Volker Strassen
Strassen-Algorithmus
Solovay-Strassen-Test
Additionskette
Binäre Exponentiation
Russische Bauernmultiplikation
Determinante
Permanente
Permutation
Permutationsmatrix
Zyklische Permutation -> Vertauschung oder Transposition
Vorzeichen (Permutation)

Woche 13

Wikipedia

Disjunktionsterm / Klausel
Literal, (Wahrheitswerte: true, false)
Cliquenproblem

YouTube

Komplexität #05 – Polyzeit-Reduktionen
16. Complexity: P, NP, NP-completeness, Reductions
Reductions – Intro to Theoretical Computer Science
Polynomialzeit-Reduktion
Vertex Cover (Knotenüberdeckung)
CSC 333 Reductions from Ham Cycle to TSP and from Vertex Cover to Dominating Set
NP Completeness for Dummies: Reduction of NP Complete Problems
Reductions and NP-Complete Proofs (CS) (Karp Reduction)

YouTube

Leibnizformel für Determinanten
Zyklendarstellung von Permutationen

Die Chomsky-Hierarchie
Theoretische Informatik, Karsten Morisse (Playlist)
Theoretische Informatik – Kontextsensitive Sprachen
Graphen, Grammatiken und Automaten, The Morpheus Tutorials (Playlist)

Bücher / Books

Diskrete Mathematik erleben, Stephan Hußmann, Brigitte Lutz-Westphal, 2015
Fundamentals of Discrete Math for Computer Science, Tom Jenkyns, Ben Stephenson, 2018
Konkrete Mathematik (nicht nur) für Informatiker, Edmund Weitz, 2018
Konkrete Mathematik (nicht nur) für Informatiker (Playlist)

NLogSpace

Formale Sprachen
Berechenbarkeit
Komplexität
Entscheidbar, unentscheidbar, semi-entscheidbar?

Mathematik-Vorkurs – Universität des Saarlandes

Kapitel 1 – Sprachen
Kapitel 2.1 – Aussagenlogik
Kapitel 2.2 – Prädikatenlogik
Kapitel 3 – Schließen und Beweisen
Kapitel 4 – Mengen
Kapitel 5 – Relationen
Kapitel 6 – Induktion