porosity | Security Analysis tool for Blockchain-based Ethereum Smart | Blockchain library
kandi X-RAY | porosity Summary
kandi X-RAY | porosity Summary
Ethereum is gaining a significant popularity in the blockchain community, mainly due to fact that it is design in a way that enables developers to write decentralized applications (Dapps) and smart-contract using blockchain technology. Ethereum blockchain is a consensus-based globally executed virtual machine, also referred as Ethereum Virtual Machine (EVM) by implemented its own micro-kernel supporting a handful number of instructions, its own stack, memory and storage. This enables the radical new concept of distributed applications. Contracts live on the blockchain in an Ethereum-specific binary format (EVM bytecode). However, contracts are typically written in some high-level language such as Solidity and then compiled into byte code to be uploaded on the blockchain. Solidity is a contract-oriented, high-level language whose syntax is similar to that of JavaScript. This new paradigm of applications opens the door to many possibilities and opportunities. Blockchain is often referred as secure by design, but now that blockchains can embed applications this raise multiple questions regarding architecture, design, attack vectors and patch deployments. As we, reverse engineers, know having access to source code is often a luxury. Hence, the need for an open-source tool like Porosity: decompiler for EVM bytecode into readable Solidity-syntax contracts – to enable static and dynamic analysis of compiled contracts but also vulnerability discovery.
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QUESTION
I'd like to create a heat map to analyze the porosity of some specimens that I have 3D-printed. the X-Y coordinates are fixed since they are the positions in which the specimens are printed on the platform.
Heatmap:
...ANSWER
Answered 2021-Apr-08 at 09:20If you want to assign color to the "black parts" you will have to interpolate the porosity over a finer grid than you currently have.
The best tool for 2D interpolation over a uniformly sampled grid is griddata
First you have to define the X-Y grid you want to interpolate over, and choose a suitable mesh density.
QUESTION
I need some help for feature extraction in time series, maybe using the TSFRESH package.
I have circa 5000 CSV files, and each one of them is a single time series (they may differ in length). The CSV-time-series is pretty straight forward:
Example of a CSV-Time-Series file: | Date | Value | | ------ | ----- | | 1/1/1904 01:00:00,000000 | 1,464844E-3 | | 1/1/1904 01:00:01,000000 | 1,953125E-3 | | 1/1/1904 01:00:02,000000 | 4,882813E-4 | | 1/1/1904 01:00:03,000000 | -2,441406E-3 | | 1/1/1904 01:00:04,000000 | -9,765625E-4 | | ... | ... |
Along with these CSV files, I also have a metadata file (in a CSV format), where each row refers to one of those 5000 CSV-time-series, and reports more general information about that time series such as the energy, etc.
Example of the metadata-CSV file: | Path of the CSV-timeseries | Label | Energy | Penetration | Porosity | | ------ | ----- | ------ | ----- | ----- | ----------- | | ... | ... | ... | ... | ... | ... | | ... | ... | ... | ... | ... | ... | | ... | ... | ... | ... | ... | ... |
The most important column is the "Label" one since it reports if a CSV-time-series was labeled as:
- Good
- Bad
I should also consider the energy, penetration, and porosity columns since those values have a big role in the labeling of the time series. (I already tried a decision tree by looking at only the features, now I would like to analyze the time series to extract knowledge)
I intend to extract features from the time series such that I can understand what are the features that make one time series be labeled as "Good" or "Bad".
How can I do this with TSFRESH? There are other ways to do this?
Could you show me how to do it? Thank you :)
...ANSWER
Answered 2020-Dec-20 at 21:52I'm doing something similar currently and this example jupyter notebook from github helped me.
The basic process is in short:
- Bring time series in acceptable format, see the tsfresh documentation for more information
- Extract features from time serieses using
X = extract_features(...)
- Select relevant features using
X_filtered = select_features(X, y)
withy
being your label, good or bad being e.g. 1 and 0. - Put select features into a classifier, also shown in the jupyter notebook.
QUESTION
I had a look around but couldn't find any answers. I have a slight issue - I have an abstract base class with a few abstract methods but also with several methods that are generic to all subclasses. Yet, in order to use these methods, I need to pass an subclass-specific attribute. This works fine, but I, of course, get warnings that the base class doesn't have the specific attribute:
...ANSWER
Answered 2020-Dec-15 at 06:32So, if I do something like this, my linter stops complaining:
QUESTION
I have little experience in developing UI in Python and right now working with tkinter I ran into an issue where I have a number of checkboxes, which are all assigned to different variables, yet for some reason clicking on one of the checkboxes activates all of them.
So in the __init__
I declare variables that should respond to clicking on checkbox:
ANSWER
Answered 2020-Dec-14 at 07:21You need to initialize your checkbox "variables" (self.minerology
, etc.) to tk.IntVar
or, probably more appropriately in your case, tk.BooleanVar
objects, not plain Python integers, like 0
.
QUESTION
ANSWER
Answered 2020-Oct-01 at 12:33You can specify the color of the violin plot in the following ways.
QUESTION
I'm trying to build a LINQ expression for fetching data from my cosmosdb container using the CosmosClient SDK. It looks something like this:
...ANSWER
Answered 2020-Sep-01 at 01:45You can use the ToQueryDefinition() extension method and get the text of SQL query from QueryText property.Then you can test that SQL using the explorer and get the SQL query which works as expected.
QUESTION
I have created the following custom query to sort documents in the 'posts' collection by the order of 'Priority' that I have defined in the kinda temp table thing that I have created inside the join clause. Now, the query itself works fine, but as soon as I order by Priority, it throws an error. So basically, order by using a variable that doesn't belong to the document doesn't work. Is there a work around for this? The reason I want to order by priority is so that I can get the documents in order and can use the continuation token to fetch paginated data from cosmos.
Do note that the inner query is dynamically generated by me in my web app code so I cannot pre-assign the priority in documents in the 'posts' container.
...ANSWER
Answered 2020-Aug-18 at 02:37It seems that the remarks section of the docs indicates the issue:
The ORDER BY clause requires that the indexing policy include an index for the fields being sorted. The Azure Cosmos DB query runtime supports sorting against a property name and not against computed properties.
Given that weights.Priority
isn't a property in the document, it can't be indexed. This suggests that the ordering value must be incorporated into the persisted data model somehow.
QUESTION
I have a binary image with black particles and white pore space. I am trying to observe the porosity variation across the image. To do this I have originally been using a square grid and measuring the porosity (ratio of black to white pixels) in each grid. I have then been uploading these values to matlab as XYZ coordinates, with X and Y being the centres of each grid and Z being the porosity value. I have then interpolated between these values to produce a porosity map.
However, when using a single square grid, the porosity map is not very representative of the binary image because the grids are coarse. However, I cannot reduce the grid size due to theoretical reasons in what I am trying to do.
However, I have found that if I overlay multiple grids, but which are shifted to the right or downwards incrementally, then I can upload these new XYZ values to matlab and interpolate between them which produces a much better porosity map.
The issue is that I can't find any reference to this method anywhere and so does anyone know if this technique is used at all or in any literature?. Also would interpolating between overlapping squares cause any issues because the porosity map produced using the overlapping squares looks good?
I have been searching the literature for what feels like an age looking for the answer to this question so I'd really appreciate any help.
...ANSWER
Answered 2020-Jul-02 at 20:56Instead of using a coarse grid and interpolating between the values, I would use a sliding window (the same size as the cells your coarse grid) and compute the porosity at every position. The multigrid approach will probably produce artifacts (aliasing issues) and is difficult to interpret.
QUESTION
I am trying to merge sort a on a key of a fairly large doubly-linked list in C, which has about 100,000 elements. Here is the structure for the DLL elements:
...ANSWER
Answered 2020-Jun-16 at 02:39@VladfromMoscow suggested using a non-recursive sorting algorithm because recursive ones are not good for long lists. Therefore, I tried to adapt for my doubly linked list an iterative version of merge sort here. Works like a charm. At least in this case it seems that the recursion really was too deep for a list this long.
QUESTION
I'm having difficulty to set X axis specific limits when I plot two curves on the same graph.
My data has two curves (PERMEABILITY and POROSITY) and DEPTH will work like an index. So I managed to plot them on the same graph and to fill the areas between them with some help. Here is my code:
...ANSWER
Answered 2020-May-09 at 04:13Your calculation of nz
converts between the two x axis scales. When you change the two scales by different amounts, you have to change your calculation of nz
. You'll need to work out how to do that precisely, but here I just eyeballed the slope and offset until it matched.
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Install porosity
First you can either compile your own Ethereum contract or analyze public contract from Etherscan.
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