Balder W. Holst

Hello there!

My name is Balder and this is my personal website. Here i write down what i learn to maybe help others some day. For now i will just act like people are reading my articles, and make them for fun.

This website has three main sections:

I write these articles for fun, and even though i try to make sure that they are correct, i am not a perfect human and there are sure to be mistakes. Below is a list of most recent articles in all categories.

Recent Posts

Safe State
Safe State A stats is safe if the system can allocate resources to each thread in some order to still avoid deadlock.
0001/01/01 · Notes
Scrum
Scrum Scrum is an experimental approach to software development. It is hard to develop a program top-down. Meaning structuring everything from the beginning and then implementing it. Scrum is therefore a bottom-up way to develop software. Scum is used together with strategies like Extreme Programming for Unified Process. Self directed and self-organizing teams Tasks are decided at the beginning of every iteration Daily stand-up meetings Demonstrations for external stakeholders The Scrum Standup Meeting Stand up - because it should be short.
0001/01/01 · Notes
Sekant
Sekant En sekant er en linje, der går gennem to punkter på en graf, det er disse punkter det giver sekanten dens hældning. Sekantens hældning (differenskvotienten) $$a=\frac{y_2-y_1}{x_2-x_1} = \frac{f(x_0+h)-f(x_0)}{\c{x_0} + h - \c{x_0}} = \frac{f(x_0+h)-f(x_0)}{h}$$ Når $h$ går mod $0$, går sekantens hældning mod tangentens hældning. Altså er tangentens hældning dette: $$f'(x_0)= \lim_{h \rightarrow 0} \left(\frac{f(x_0+h)-f(x_0)}{h}\right)$$ Se også Linære Funktioner Tangent Differentialregning Tags #matematik
0001/01/01 · Notes
Seperation of Variables
Seperation of Variables $$u(x,y) = F(x)G(y)$$ This is not true for all $u(x,y)$. It must be linear and homogeneous. Eigen Values The special values of $\lambda$ that allow you to satisfy the boundary conditions. $$ \begin{cases} \lambda > 0: &\Rightarrow & f(x) = \sin(\sqrt{\lambda}y) + \cos(\sqrt{\lambda }y) \ \lambda < 0: &\Rightarrow & f(x) = e^{\pm\sqrt{\lambda}y} \end{cases} $$ Procedure Assume that $u(x,y) = F(x)G(y)$ Differentiate to get the derivatives your equation contains.
0001/01/01 · Notes
Sequences
Sequences The digital representation of a signal. If you laplace-transform a sequence, you will end up with an infinite amount of poles.
0001/01/01 · Notes
Serieforbindelser
Serieforbindelser “In order for elements A and B to be in series, no other path for current can be connected to the node joining A and B. Thus, all elements in a series circuit have identical currents.” The direction of current flow is IRRELEVANT. Resistance ($R$) The sum of resistances. $$R_{eq} = R_1 + R_2 + R_3 + \dots$$ $R_{eq}$ : Den ækvivalente modstand. $R_n$ : Modstanden i hver modstand der er serieforbundet.
0001/01/01 · Notes
Shannon Formula
Shannon Formula (Noisy Channel) Calculates the upper limit for the data rate for the physical transmission material. $$V_{S} = B \cdot \log_{2}(1+SNR)$$ $V_{S}$: Data rate $[\text{bit} / s]$ or $[\text{BPS}]$ $B$: Bandwidth $[\text{Hz}]$ $SNR$: Signal-to-noise ratio Note: this does not take signal levels into a count.
0001/01/01 · Notes
Signal element
Signal element The shortest unit of time that can represent a packet of bits. A signal element can reperesent more than one bit by having more levels. A signal that can only be HIGH or LOW, can only represent one bit pr. signal element, but a signal that can be 1V, 2V, 3V or 4V, can reperecent TWO, bits pr. signal element. A small number of signal levels is easier to parse the signal and lessens the effectes of distortion.
0001/01/01 · Notes
Signal Processing
Signal Processing Decibels $$A_{dB} = 20 \cdot \log_{10}(A_{\text{times}})$$ Notes list from #signalprocessing sort file.name
0001/01/01 · Notes
Signal Reconstruction
Signal Reconstruction See slides. Digital to Analog Converter (D/A) Et “holdekredsløb” bruges til at “fylde tiden ud”. Reconstruction Filter The filter that “smooths is all out”. The reconstruction filter ideally compensates for the $\text{sinc}$-function.
0001/01/01 · Notes