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2026-04-17 14:55:32 -04:00
commit bc3ac1d4c9
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace DTS.Common.Calculations
{
/// <summary>
/// Filtered Channel Data
/// simple class for holding generic data for calculations
/// in the future I'd like to be able to accept channels with different units and convert them
/// to a common unit, so I add support for that now
/// </summary>
public class ChannelData
{
/// <summary>
/// Engineering units of Data
/// </summary>
public string Units { get; }
/// <summary>
/// Pre-Filtered EU data
/// </summary>
public double[] FilteredEU { get; set; }
/// <summary>
/// Constructs a ChannelData object
/// </summary>
/// <param name="units">Engineering units of data</param>
public ChannelData(string units)
{
Units = units;
}
}
}

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using System;
namespace DTS.Common.Calculations
{
public class HeadInjuryCriterion
{
/// <summary>
/// Calculates the head injury criterion given a resultant channel, and a desired clip length
/// </summary>
/// <param name="resultant">Acceleration vector (x,y,z resultant)</param>
/// <param name="SPS">Actual sample rate</param>
/// <param name="clipLengthMS">Length in ms </param>
/// <returns>MAX Head Injury Criterion over the data input for the clip requested</returns>
public static HICResult GetHeadInjuryCriterion(ChannelData resultant, double SPS, int clipLengthMS)
{
System.Diagnostics.Trace.Assert(SPS > 0, "Actual sample rate must be positive");
System.Diagnostics.Trace.Assert(clipLengthMS > 0, "Clip length must be positive");
int maxHICPoint = int.MinValue;
double maxHIC = int.MinValue;
int maxHICEndPoint = int.MinValue;
int maxclip = Convert.ToInt32(Math.Ceiling(clipLengthMS * SPS / 1000D));
for (int clip = 1; clip <= maxclip; clip++)
{
System.Diagnostics.Trace.Assert(clip < resultant.FilteredEU.Length, string.Format("data must be atleast {0} ms", clipLengthMS));
double clipInSeconds = clip / SPS;
for (int i = 0; i < resultant.FilteredEU.Length - clip; i++)
{
//note we are exhaustively recalculating sums, we can do this much better without a doubt, but lets get the
//first method done (brute force)
//also note, definite integral doesn't include last point, so we have to add one point back in
double integral = Integral.DefiniteIntegral(resultant.FilteredEU, i, i + clip, SPS);
double hic = clipInSeconds * Math.Pow(integral / clipInSeconds, 2.5D);
if (hic > maxHIC) { maxHIC = hic; maxHICPoint = i; maxHICEndPoint = i + clip; }
}
}
return new HICResult(maxHIC, clipLengthMS, maxHICPoint, maxHICEndPoint);
}
/// <summary>
/// helper class for storing/handling hic results
/// </summary>
public class HICResult
{
public int StartSample { get; }
public int EndSample { get; }
public int HicLengthMS { get; }
public double HIC { get; }
/// <summary>
/// constructs a new HIC result
/// </summary>
/// <param name="hic">HIC value</param>
/// <param name="hicLength">length of HIC in ms</param>
/// <param name="endSample">start sample of HIC</param>
/// <param name="startSample">end sample of HIC</param>
public HICResult(double hic, int hicLength, int startSample, int endSample)
{
StartSample = startSample;
EndSample = endSample;
HicLengthMS = hicLength;
HIC = hic;
}
}
}
}

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using System.Collections.Generic;
using System.Linq;
namespace DTS.Common.Calculations
{
public static class Resultant
{
/// <summary>
/// generates a resultant channel given input vectors
/// Will throw an assertion if lengths of data don't match, or if
/// units don't match
/// </summary>
/// <param name="channels">List of channels to combine via
/// sum of squares
/// </param>
/// <returns>
/// resultant vector from sum of squares of inputs
/// </returns>
public static ChannelData GenerateResultantChannel(List<ChannelData> channels)
{
int length = (from ch in channels select ch.FilteredEU.Length).Max();
foreach (var ch in channels) { System.Diagnostics.Trace.Assert(ch.FilteredEU.Length == length); }
//make sure the channels are all the same units and lengths,
//we assert here since the higher level should be expected to provide clean inputs
var units = (from ch in channels select ch.Units).Distinct();
System.Diagnostics.Trace.Assert(units.Count() == 1);
var values = new List<double>();
//in a future version we can parallize this for efficiency
//values.Add will need to be replaced by an indexer when we do
for (int i = 0; i < length; i++)
{
double d = 0D;
foreach (var ch in channels)
{
d += ch.FilteredEU[i] * ch.FilteredEU[i];
}
values.Add(System.Math.Sqrt(d));
}
var cd = new ChannelData(units.First());
cd.FilteredEU = values.ToArray();
return cd;
}
}
}

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namespace DTS.Common.Calculations
{
public static class Integral
{
/// <summary>
/// integrates a channel over an interval
/// </summary>
/// <param name="input">data to integrate</param>
/// <param name="start">index to start integration at (inclusive)</param>
/// <param name="end">index to end integration at (inclusive)</param>
/// <returns></returns>
public static double DefiniteIntegral(double[] input, int start, int end, double SPS)
{
//we use trapezoidal summation to get integral, there is an assumption that the input data is
//tightly time aligned (otherwise we'd have to divide each interval by the actual distance, and not 1/2)
//=(SUMPRODUCT(H25:H56,A26:A57)-SUMPRODUCT(A25:A56,H26:H57)+A57*H57-A25*H25)/2
double d = 0;
for (int i = start + 1; i < end; i++)
{
d += 2D * input[i];
}
d += input[start];
d += input[end];
return .5D * d / SPS;
}
}
}

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<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProductVersion>9.0.21022</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<ProjectGuid>{5CE6F27B-1C5B-4101-88DE-58A30B1E5F37}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>DTS.Common.Calculations</RootNamespace>
<AssemblyName>Calculations</AssemblyName>
<TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<FileUpgradeFlags>
</FileUpgradeFlags>
<UpgradeBackupLocation>
</UpgradeBackupLocation>
<OldToolsVersion>3.5</OldToolsVersion>
<TargetFrameworkProfile />
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\x86\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x86</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
<OutputPath>bin\x86\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x86</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x64'">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\x64\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x64</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
<OutputPath>bin\x64\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x64</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
</Reference>
<Reference Include="System.Xml.Linq">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
</Reference>
<Reference Include="System.Data.DataSetExtensions">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
</Reference>
<Reference Include="System.Data" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="ChannelData.cs" />
<Compile Include="HeadInjuryCriterion.cs" />
<Compile Include="Integral.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="Resultant.cs" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>

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using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("HeadInjuryCriterion")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("HeadInjuryCriterion")]
[assembly: AssemblyCopyright("Copyright © 2013")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("a83e3800-290f-4513-9756-d37168152099")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace DTS.Common.Calculations
{
/// <summary>
/// Filtered Channel Data
/// simple class for holding generic data for calculations
/// in the future I'd like to be able to accept channels with different units and convert them
/// to a common unit, so I add support for that now
/// </summary>
public class ChannelData
{
/// <summary>
/// Engineering units of Data
/// </summary>
public string Units { get; }
/// <summary>
/// Pre-Filtered EU data
/// </summary>
public double[] FilteredEU { get; set; }
/// <summary>
/// Constructs a ChannelData object
/// </summary>
/// <param name="units">Engineering units of data</param>
public ChannelData(string units)
{
Units = units;
}
}
}

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<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProductVersion>9.0.21022</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<ProjectGuid>{5CE6F27B-1C5B-4101-88DE-58A30B1E5F37}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>DTS.Common.Calculations</RootNamespace>
<AssemblyName>Calculations</AssemblyName>
<TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<FileUpgradeFlags>
</FileUpgradeFlags>
<UpgradeBackupLocation>
</UpgradeBackupLocation>
<OldToolsVersion>3.5</OldToolsVersion>
<TargetFrameworkProfile />
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\x86\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x86</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
<OutputPath>bin\x86\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x86</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x64'">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\x64\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x64</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
<OutputPath>bin\x64\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x64</PlatformTarget>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<Prefer32Bit>false</Prefer32Bit>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
</Reference>
<Reference Include="System.Xml.Linq">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
</Reference>
<Reference Include="System.Data.DataSetExtensions">
<RequiredTargetFramework>3.5</RequiredTargetFramework>
</Reference>
<Reference Include="System.Data" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="ChannelData.cs" />
<Compile Include="HeadInjuryCriterion.cs" />
<Compile Include="Integral.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="Resultant.cs" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>

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using System;
namespace DTS.Common.Calculations
{
public class HeadInjuryCriterion
{
/// <summary>
/// Calculates the head injury criterion given a resultant channel, and a desired clip length
/// </summary>
/// <param name="resultant">Acceleration vector (x,y,z resultant)</param>
/// <param name="SPS">Actual sample rate</param>
/// <param name="clipLengthMS">Length in ms </param>
/// <returns>MAX Head Injury Criterion over the data input for the clip requested</returns>
public static HICResult GetHeadInjuryCriterion(ChannelData resultant, double SPS, int clipLengthMS)
{
System.Diagnostics.Trace.Assert(SPS > 0, "Actual sample rate must be positive");
System.Diagnostics.Trace.Assert(clipLengthMS > 0, "Clip length must be positive");
int maxHICPoint = int.MinValue;
double maxHIC = int.MinValue;
int maxHICEndPoint = int.MinValue;
int maxclip = Convert.ToInt32(Math.Ceiling(clipLengthMS * SPS / 1000D));
for (int clip = 1; clip <= maxclip; clip++)
{
System.Diagnostics.Trace.Assert(clip < resultant.FilteredEU.Length, string.Format("data must be atleast {0} ms", clipLengthMS));
double clipInSeconds = clip / SPS;
for (int i = 0; i < resultant.FilteredEU.Length - clip; i++)
{
//note we are exhaustively recalculating sums, we can do this much better without a doubt, but lets get the
//first method done (brute force)
//also note, definite integral doesn't include last point, so we have to add one point back in
double integral = Integral.DefiniteIntegral(resultant.FilteredEU, i, i + clip, SPS);
double hic = clipInSeconds * Math.Pow(integral / clipInSeconds, 2.5D);
if (hic > maxHIC) { maxHIC = hic; maxHICPoint = i; maxHICEndPoint = i + clip; }
}
}
return new HICResult(maxHIC, clipLengthMS, maxHICPoint, maxHICEndPoint);
}
/// <summary>
/// helper class for storing/handling hic results
/// </summary>
public class HICResult
{
public int StartSample { get; }
public int EndSample { get; }
public int HicLengthMS { get; }
public double HIC { get; }
/// <summary>
/// constructs a new HIC result
/// </summary>
/// <param name="hic">HIC value</param>
/// <param name="hicLength">length of HIC in ms</param>
/// <param name="endSample">start sample of HIC</param>
/// <param name="startSample">end sample of HIC</param>
public HICResult(double hic, int hicLength, int startSample, int endSample)
{
StartSample = startSample;
EndSample = endSample;
HicLengthMS = hicLength;
HIC = hic;
}
}
}
}

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namespace DTS.Common.Calculations
{
public static class Integral
{
/// <summary>
/// integrates a channel over an interval
/// </summary>
/// <param name="input">data to integrate</param>
/// <param name="start">index to start integration at (inclusive)</param>
/// <param name="end">index to end integration at (inclusive)</param>
/// <returns></returns>
public static double DefiniteIntegral(double[] input, int start, int end, double SPS)
{
//we use trapezoidal summation to get integral, there is an assumption that the input data is
//tightly time aligned (otherwise we'd have to divide each interval by the actual distance, and not 1/2)
//=(SUMPRODUCT(H25:H56,A26:A57)-SUMPRODUCT(A25:A56,H26:H57)+A57*H57-A25*H25)/2
double d = 0;
for (int i = start + 1; i < end; i++)
{
d += 2D * input[i];
}
d += input[start];
d += input[end];
return .5D * d / SPS;
}
}
}

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using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("HeadInjuryCriterion")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("HeadInjuryCriterion")]
[assembly: AssemblyCopyright("Copyright © 2013")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("a83e3800-290f-4513-9756-d37168152099")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

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using System.Collections.Generic;
using System.Linq;
namespace DTS.Common.Calculations
{
public static class Resultant
{
/// <summary>
/// generates a resultant channel given input vectors
/// Will throw an assertion if lengths of data don't match, or if
/// units don't match
/// </summary>
/// <param name="channels">List of channels to combine via
/// sum of squares
/// </param>
/// <returns>
/// resultant vector from sum of squares of inputs
/// </returns>
public static ChannelData GenerateResultantChannel(List<ChannelData> channels)
{
int length = (from ch in channels select ch.FilteredEU.Length).Max();
foreach (var ch in channels) { System.Diagnostics.Trace.Assert(ch.FilteredEU.Length == length); }
//make sure the channels are all the same units and lengths,
//we assert here since the higher level should be expected to provide clean inputs
var units = (from ch in channels select ch.Units).Distinct();
System.Diagnostics.Trace.Assert(units.Count() == 1);
var values = new List<double>();
//in a future version we can parallize this for efficiency
//values.Add will need to be replaced by an indexer when we do
for (int i = 0; i < length; i++)
{
double d = 0D;
foreach (var ch in channels)
{
d += ch.FilteredEU[i] * ch.FilteredEU[i];
}
values.Add(System.Math.Sqrt(d));
}
var cd = new ChannelData(units.First());
cd.FilteredEU = values.ToArray();
return cd;
}
}
}

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// <autogenerated />
using System;
using System.Reflection;
[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETFramework,Version=v4.8", FrameworkDisplayName = "")]

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// <autogenerated />
using System;
using System.Reflection;
[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETFramework,Version=v4.8", FrameworkDisplayName = ".NET Framework 4.8")]