Is this logarithmic expression a convex function?

More Majid Mobini's questions See All

What are the differences between PCA and SVD decomposition approaches?

Is there essentially a difference? Which one is optimal or low complexity ? is here a relation with the rank?

08 September 2019 2,246 3 View

What is the simplest way to solution of a single variable nonlinear equation?

what is the simplest way to solution of a single variable nonlinear equation?

04 May 2017 8,353 2 View

Is the Output of correlator always Gaussian?

For a channel with white Gaussian noise , is the Output of correlator always Gaussian random variable? (for different modulations and coherent or non-coherent detection, etc.)for example,...

04 May 2017 9,754 0 View

What is definition of a convex monotonic increasing function?

Hi, what is definition of a convex monotone increasing (or decreasing) function?is it possible that a convex function with a global minimum, be a monotonic increasing function? thanks

03 April 2017 338 1 View

Please consider standard hmax model and a cell array as output of the c2 layer. which of them is our feature vector for classification?

hi dear all; consider standard hmax matlab implementation:http://riesenhuberlab.neuro.georgetown.edu/hmax.html if we work with 10 images for example, this program returns c2 in the form of a 1x8...

11 December 2016 5,052 1 View

Can we measure the effect of noise on a chaotic signal using the lyapunov exponent?

hi dear all.assume that a chaotic signal is received from the two different noisy channels. can we measure the effect of noise on a chaotic signal using the Lyapunov exponent? or you prefer...

07 August 2016 5,448 4 View

Is there any mathematical demonstration for advantage of the chaotic spreading sequence compared with the gold or other spreading sequences?

07 August 2016 409 0 View

What are the today's challenges in chaotic based wireless communications researches ?(chiefly wireless communication)

what is the today's challenge in chaotic based communications ?

31 December 2014 10,111 3 View

Hi dear all; consider 5 complex nonlinear equations with 5 variables. what is the simplest method for solution?

hi dear all; consider 5 complex nonlinear equations with 5 variables. what is the simplest method for solution?

01 January 1970 4,275 6 View

How can we calculate the entropy of chaotic signals in a communication system?

Hi, How can we calculate the entropy of chaotic signals? Is there a simple method or formula for doing this?

01 January 1970 8,220 2 View

How to learn more about SPSS and its Application?

I would like to learn more about SPSS and Its application especially in regards to data analysis. Please suggest me how I can learn more about it. Thank you so much.

11 August 2024 9,101 4 View

Can I base on reverse DNA sequences to perform alignment, convert to amino acids and GenBank submission?

I have reverse sequences (AB1 format), can I base on reverse DNA sequences to perform nucleotide alignment, convert nucleotides to amino acids and deposit the sequence in GenBank database?

11 August 2024 5,138 1 View

Baseline drift in HPLC? What causes this?

Hello, Why do i see this baseline drift when i compare my blank (black) to the sample (blue)? Any suggestions as to why this happened? Thank you!

11 August 2024 3,770 4 View

What is the difference between mathematical R^4 space and physical 4D unit space?

We assume that the difference is huge and that it is not possible to compare the two spaces. The R^4 mathematical space considers time as an external controller and the space itself is immobile in...

10 August 2024 6,678 14 View

Text-Communication from the M1 Hand Area using BCI—and then there is Elon Musk?

Willett, Shenoy et al. (2021) have developed a brain computer interface (BCI) that used neural signal collected from the hand area of the motor cortex (area M1) of a paralyzed patient. The...

10 August 2024 7,180 0 View

Has anyone applied Python in the field of textile engineering for data analysis, automation, or smart textiles?

I'm currently exploring the application of Python in textile engineering, specifically in areas like data analysis, process automation, and the development of smart textiles. I'm interested in...

10 August 2024 7,429 2 View

Geotechnical Engineering (Proceedings of the ICE) time review?

Hello everyone, I recently submitted an article to Geotechnical Engineering (Proceedings of the ICE), and the current status has been listed as "EiC Pre-assessment: Ready" for the past 20 days. I...

10 August 2024 6,493 1 View

How can I use the cif data obtained from rietveld refinement extracted via gsas2, for microstructural analysis using ETEX software?

09 August 2024 7,718 0 View

How are iso-frequency contours plotted?

Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...

07 August 2024 1,937 1 View

Hello all, Looking for international reviewer to review Ph.D thesis in wireless sensor network.Can anybody help?

My name is Apurva Saoji. I am a Ph.D scholar in Computer engineering in India. I am looking for international expert in reviewing my PhD thesis, "Competitive Optimization Techniques to Minimize...

07 August 2024 4,600 2 View

Béla Vizvári

A function is convex if the second derivative is positive,

Gianluca Argentini

Dear Majid, your function has not an only positive or only negative second derivative; its second derivative has one zero at x = 0.707107, so f(x) is not a convex function in (-1/2, +infty).

Gianluca

Ibraheem Kasim Ibraheem

Check the graph the function, then find the limits where the function is convex or concave