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Topic: Volume (compression)

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	Compression Domain Volume Processing
		As the volume data sets grow bigger and bigger, data compression algorithms are required to reduce the disk storage size, and potentially the memory size during rendering as well.
		Existing tetrahedral mesh compression algorithms focus only on compression efficiency and cannot be readily integrated into the mesh rendering process, and thus demand that a compressed tetrahedral mesh be decompressed before it can be rendered into a 2D image.
		Since simplification is a form of lossy compression, the on-the-fly volume simplification algorithm provides a powerful echanism to dynamically create versions of a tetrahedral mesh at multiple resolution levels directly from its losslessly compressed representation, which also orresponds to the finest resolution level.
	www.ecsl.cs.sunysb.edu /compression_domainVR/compression_domainVR.html (1110 words)

	How To Calculate Compression Ratio (Site not responding. Last check: 2007-10-14)
		Compression ratio is the relationship of cylinder volume (or displacement) with the piston at BDC to cylinder volume with the piston at TDC.
		If the volume of the cylinder with the piston at BDC is 10 times greater than the volume of the combustion area with the piston at TDC, then 10 units of volume get squeezed into 1 unit of space, and the compression ratio is 10.0:1.
		For the purposes of calculating compression, we prefer to view the cc's of a dish as a positive number because a dish adds volume to the cylinder (and reduces the compression ratio); a dome is a negative number because it subtracts volume from the cylinder (and increases the compression ratio).
	www.carcraft.com /techarticles/982 (1724 words)

	Expander
		Compression is the process of reducing the volume of some amount of the residual steam into the clearance space.
		The volume of the expander at max volume is the specific volume at the end of expansion.
		Being compression the ending volume is computed by dividing the specific volume of the exhaust steam by the compression ratio and locating the steam point with this specific volume and entropy.
	ghlin2.greenhills.net /~apatter/expander.html (2376 words)

	Binder Bulletin Forums - head swap and compression ratio (Site not responding. Last check: 2007-10-14)
		If the factory specs compression numbers are to be taken as accurate then you can calculate the volume of the head/combustion chamber that the cylinder volume is compressed into, giving you the compression ratio.
		With the 152 head, we are compressing the volume 48.86227 into the volume of the 152 head, which we calculated at 4.634860205.
		Compression ratio is figured as the volume of the entire cylinder (computed from bore and stroke) and the volume of the combustion chamber (including head gasket thickness, etc.) divided by just the volume of the combustion chamber.
	www.binderbulletin.org /forums/showthread.php?t=12985 (1130 words)

	Allocating Storage and Compressing Data (Site not responding. Last check: 2007-10-14)
		Volume size (maximum space to use on the volume)-The default value is Unlimited; the minimum setting is 8 megabytes.
		When a compressed data block is brought into the data cache, Analytic Services expands the block to its full size, regardless of the scheme that was used to compress it.
		In contrast to bitmap compression, which uses an algorithm to track which values are missing and does not interact with any other type of data, zlib compression builds a data dictionary based on the actual data being compressed (including any missing values).
	www-306.ibm.com /software/data/db2/db2olap/docs/v82docs/dbag/dstalloc.htm (3378 words)

	Compression Ratio - Page 1
		We know that in general a high compression ratio is good for performance and efficiency, but that it can also lead to "knocking" or "detonation".
		C.R. The volumes involved are the volume of the combustion chamber (V2) and the "swept volume" of the cylinder.
		The swept volume is obtained by multiplying the cross-sectional area of the cylinder bore (Ac) by the stroke.
	e30m3performance.com /myths/more_myths1/comp_ratio/comp_ratio.htm (387 words)

	HondaSwap.com -> How to Compute the Compression Ratio of a motor (Site not responding. Last check: 2007-10-14)
		The compression ratio is the relationship between the swept volume to the total chamber volume.
		The volume is usually advertised for an aftermarket cylinder head by the manufacture or obtained in the repair manual for your vehicle.
		The volume of either the dish or dome type pistons are usually advertised from the manufacture or listed in the repair manual for your vehicle or it can be measured by using the alcohol technique for dished pistons, with a suitably accurate burette or similar device place liquid in the dish.
	www.hondaswap.com /forums/index.php?showtopic=29798 (925 words)

	The Datsun Workshop Compression page
		The swept volume is the area the piston displaces in one up-down sweep.
		For reference, the 1 mm and 2 mm HKS metal gaskets do not compress, so that is the thickness for computations, and they have a 91 mm bore, which will further change the calculation.
		You are increasing your start volume, but keeping the end volume the same,(we are assuming, for it will change with different stroke cranks, different length rods...), and are compressing more air.
	www.geocities.com /row4navy/compression.html (1423 words)

	Blaine Technologies - Articles
		Compression ratio is defined as the volume above the piston at bottom dead center (BDC) as compared to the volume above the piston at top dead center (TDC).
		Swept cylinder volume is the area of the cylinder covered by the "sweep" of the piston as it moves from BDC to TDC, indicated by the blue region in Figure 3.
		The lowly head gasket contributes to compression ratio as well, both through its compressed thickness and its bore (gasket bore is typically larger than cylinder bore.) Gasket bore and compressed gasket thickness figures are available from the head gasket manufacturer.
	www.blainetech.net /articles/default.php (905 words)

	' + pPage + ' (Site not responding. Last check: 2007-10-14)
		If you are compressing drive C, for example, and use H as the host drive's ID, your existing drive C is assigned drive letter H. The new compressed volume then is recognized as drive C. You can assign any unused drive letter to the host drive.
		The compression ratio of a compressed volume is just a factor that DriveSpace uses to report the amount of potential free space left in the compressed volume.
		You might want to move the volume to a different host disk, or you might be experiencing problems with the compressed volume and want to run ScanDisk on the volume file from the Windows 98 command prompt (outside of the GUI) to check the volume.
	www.dec.ctu.edu.vn /cit/tailieu/books/insidewin98/ch14/ch14.htm (12089 words)

	Dynamic CR
		A cylinder with 10 units of volume (called the sweep volume) and a chamber with a volume of 1 has a 10:1 compression ratio.
		Dynamic Compression Ratio, on the other hand, uses the position of the piston at intake valve closing rather than BDC of the crank stroke to determine the sweep volume of the cylinder.
		This lowering of the compression ratio, due to the late closing of the intake valve, is the primary reason cam manufactures specify a higher static compression ratio for their larger cams: to get the running or dynamic CR into the proper range.
	cochise.uia.net /pkelley2/DynamicCR.html (2291 words)

	Compression Lessons (Site not responding. Last check: 2007-10-14)
		Let’s start out by defining compression ratio, which is the ratio of the cylinder volume with the piston at the bottom of its stroke (bottom dead center or BDC) compared to the cylinder volume when the piston reaches the top of its stroke (top dead center or TDC).
		The equation for the volume of a cylinder is
		Conversely, a domed piston increases compression by displacing volume from the combustion chamber.
	www.chevyhiperformance.com /techarticles/46778 (2017 words)

	Journal of Medical Internet Research - Virtual Sonography Through the Internet: Volume Compression Issues
		In 3-D volume rendering, volume data management includes special techniques for acquisition (in our case moving the ultrasound probe by hand), re-sampling (particularly detailed because of the compression it achieved) and editing the data set by "flying-through", "flying around", multiple-view display, obscured structure and shading depth cues, or kinetic and stereo depth cues [5].
		Volume rendering transforms the original data into a collection of visible primitives (basic shapes) from the 3-D object, which can be viewed from any direction in space.
		When volume data is stored, it is compressed with a Huffman-encoding technique, which is lossless, of about 1:3 compression ratio (Table 1).
	www.jmir.org /2001/2/e21 (2864 words)

	IPS Lab - Projects - Lossless Volume Compression
		Compression for efficient storage and transmission of digital data has become routine as the application of such data has grown.
		The algorithm we propose for volume compression is a combination of differential pulse-code modulation (DPCM) and Huffman coding.
		In a volume, adjacent voxels usually possess a high degree of spatial coherence; that is, adjacent voxel values are highly correlated.
	www.ece.osu.edu /ips/research/Projects/volume_compression/volume_compression.html (420 words)

	Volume Compression Operation
		If you are creating a compressed volume from empty space, the CVF is written directly onto the hard disk and prepared with the correct internal structures for operation.
		If you are creating a compressed volume from an existing disk with files on it, the software may not have enough free space to create the full CVF.
		Another option that the compression software usually has the ability to provide is to "substitute" the compressed volume in place of the host volume it is made from.
	www.storagereview.com /guide2000/ref/hdd/file/comprOperation.html (722 words)

	Static Compression, Dynamic Compression, Quench... - www.ezboard.com (Site not responding. Last check: 2007-10-14)
		Compression Ratio = (swept volume + combustion volume) / combustion volume
		Combustion Volume assuming it's.006" in the hole, a.029" compressed gasket with a gasket bore of 4.125, -5cc piston volume for valve reliefs...
		That means, this given combination is going to be on the edge, and to keep from having to sacrifice timing advance, we should drop the static CR, or run a cam with a later IVC if you dont mind moving the powerband up.
	p073.ezboard.com /fspeedtrapfrm33.showMessage?topicID=233.topic (1496 words)

	BU CDRW Data Format
		Compression is on by default but if it is turned off in the RC file, this will be a plain tar file.
		It changes volumes when it encounters a file that it thinks will not fit in the remaining space of the current volume.
		To maximize volume usage efficiency, bu also continuously monitors the amount of actual data after compression that has been written during the dump so that it does not have accumulated error from estimating the compression ratio of files.
	hightek.org /bu/cdrw-data-format.html (706 words)

	Personal Watercraft High Performance Compression Ratios
		The mechanical compression is calculated from the swept cylinder area above the exhaust port, and the combustion chamber volume at top dead center.
		The functional factors involved with maintaining the accuracy of the mechanical compression ratio are, the overall cylinder height (with gasket thicknesses included), the exhaust port height, and the volume of the dome in the cylinder head (measured in cubic centimeters or "cc").
		This means that the air volume inside that hose (usually about 3-4 cc) is added to the combustion chamber volume during a measurement.
	www.groupk.com /comp.html (1782 words)

	Compression Domain Volume Rendering for Distributed Environments (Abstract) (Site not responding. Last check: 2007-10-14)
		This paper describes a method for volume data compression and rendering which bases on wavelet splats.
		The underlying concept is especially designed for distributed and networked applications, where we assume a remote server to maintain large scale volume data sets, being inspected, browsed through and rendered interactively by a local client.
		Therefore, we encode the server’s volume data using a newly designed wavelet based volume compression method.
	www.eg.org /EG/CGF/volume16/issue3/CGF146.html (266 words)

	Volume Compression Products
		Volume compression is no longer nearly as popular as it was in the 1990s.
		If you want to compress a 1 GB host drive you have to split it into three or four compressed volumes.
		It's important to realize that volume compression really is out of favor today, and this is reflected in the status of volume compression products here in the 21st century.
	www.pcguide.com /ref/hdd/file/comprProducts-c.html (615 words)

	Songstuff - Compression (Site not responding. Last check: 2007-10-14)
		For example, if the compression ratio is 4:1 and the input signal exceeds the threshold level by 4 dB the output signal will only exceed the threshold by 1 dB.
		If the compression ratio is set to 20:1 or more the compressor is being used as what is known as a limiter.
		The overall process of compressing the signal above the threshold and then boosting the overall signal amplitude reduces the difference in amplitude between the loudest and softest sound.
	www.songstuff.com /articles.php?selected=41 (575 words)

	Volume 2 Number 4 Abstracts
		This paper extends several fractal image compression enhancements to perform properly and efficiently on volumetric data, and introduces a new 3D edge classification scheme based on principal component analysis.
		At this peak efficiency, fractal volume compression surpasses vector quantization and approaches within 1 dB PSNR of the discrete cosine tranform.
		When compared to the DCT, fractal volume compression represents surfaces in volumes exceptionally well at high compression rates, and the artifacts of its compression error appear as noise instead of deceptive smoothing or distracting ringing.
	www.cs.sunysb.edu /~tvcg/v2n4/abstract.html (1083 words)

	[No title]
		To begin, the words "compression ratio" can often be confusing when discussed over bench racing beers because most of us associate "compression ratios" with the two-cycle's "enemy", the four cycle engine (big and small block Chevy's, Fords, etc).
		All compression ratio values, either geometric or trapped, are the ratio of the maximum volume in any chamber of an engine to the minimum volume in that chamber.
		That is, determine what cranking compression, on gauge, an engine will survive at using a particular grade of fuel, then shave the heads to meet this goal.
	www.hydrostream.org /ArticleArchives/Compression.htm (978 words)

	How To Use File Compression in Windows XP
		Compressing files, folders, and programs decreases their size and reduces the amount of space they use on your volumes or removable storage devices.
		Volume compression decreases the amount of space that is used by all of the files and folders that are stored on that volume.
		When you open a compressed file, Windows automatically decompresses it for you, and when you close the file, Windows compresses it again.
	support.microsoft.com /default.aspx?scid=kb;en-us;307987 (565 words)

	Comp Ratio How To (Site not responding. Last check: 2007-10-14)
		If the piston is closer to the deck, clearance volume is reduced and compression ratio is increased.
		If the deck height of our sample engine was decreased to 0.003, compression would increase from 8.84:1 to 9.05:1.
		Also, the gasket bore is often larger than the engine bore; a 4.100-inch gasket is common.
	www.truckpulls.com /How_to_Calculate_comp_ratio.htm (1391 words)

	Checking Compression Ratio \| Advance Auto Parts (Site not responding. Last check: 2007-10-14)
		For those who don't understand what compression ratio is, it's simply the total volume of the cylinder and combustion chamber above the piston at the bottom of its travel (referred to as bottom dead center [BDC]), divided by the combustion chamber volume above the piston at top dead center (TDC).
		The reason for this difference is that compression ratio equates to heat, and aluminum heads reject heat better and faster than cast iron.
		For those who are intimidated by pi, another way to get the cylinder volume in ccs is to multiply the bore times itself (bore squared) x 0.785 x the stoke (in inches) x 16.387.
	www.pdqpartners.com /english/youcan/html/pht/pht20020701cr.html (976 words)

	tum.3D - Computer Graphics and Visualization
		A survey of graphics developers on the issue of texture mapping hardware for volume rendering would most likely find that the vast majority of them view limited texture memory as one of the most serious drawbacks of an otherwise fine technology.
		In this paper, we propose a compression scheme for static and time-varying volumetric data sets based on vector quantization that allows us to circumvent this limitation.
		We show, that decoding and rendering the compressed data stream can be done on the graphics chip using programmable hardware.
	wwwcg.in.tum.de /Research/Publications/VQCompression (195 words)

	Compression Ratio
		Try various deck heights until the desired compression ratio is indicated.
		There are many factors that affect the octane requirement, including: air density, humidity, air-fuel ratio, ignition advance, head temperature, carburation, and the camshaft.
		A small increase in compression ratio will only slightly increase power but any detonation can quickly destroy your motor.
	www.dunegoon.org /compression.html (88 words)

	Compression Ratio and Minimum Cylinder Volume (CR/MCV)
		The CR/MCV subsystem is designed to precisely measure the compression ratio and minimum cylinder volume of spark-ignition and diesel internal combustion engines.
		A portion of the cold-motored compression or power stroke that is well modeled by the polytropic equation is chosen for analysis.
		This information is used to compute the nominal change in volume between successive pressure data measurement positions.
	www.jodon.com /crmcv.html (817 words)

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