FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W643166363> ?p ?o ?g. }

• W643166363 abstract "In the later years the scientist community has bin investigating the possibility of using zoo plankton as a commercial resource. It is therefore of interest to investigate the size distribution and abundance of zoo plankton. NTNU has for this purpose developed an Acoustical plankton recorder or APR, for determination of the size distribution and abundance of plankton. The system utilizes three frequencies namely 200 kHz, 710 kHz and 1 MHz for the task. A specific kind of plankton called Callanus finmarchicus which has primarily a size range from 1-3 mm is considered the most interesting one since it has a large population in the Norwegian Sea. In this report the signal processing from the “raw” measured values with the APR to the calculated distribution of plankton is described. The following steps has bin carried out in the signal processing: • First of the measured values are processed with an exact “Time Varied Gain Function” or TVG. This function will compensate for the range from the APR to the target by information about the absorption, the range, the pulse-length and the band-width of the receiver. The exact TVG function has bin used since the ordinary TVG function will give a positive bias for ranges below 10 meters • After the TVG function the Echo Integrator equation with noise subtraction is used. This will reduce the effect of noise in the measurements and improve the linearity principle. • At the end inversion is carried out. Two different algorithms are used in the purpose of the inversion, namely the “Least Square non Negative” and the GA algorithm. The inversion will try to find the best fit between the measured data and the mathematically modelled plankton distribution and thereby calculating the size distribution and abundance of plankton. The echo integration with noise subtraction works by calculating the energy in the measurement over a series of samples contributing to a distance in the measurement in active mode. The samples contributing to the same distance is then used to calculate the energy in passive mode and this value is then subtracted from the energy in active mode. The accuracy of the method is dependent on the number of samples used giving better results with an increasing number of samples. Therefore the method has to be used with consideration to the resolution needed in the measurements. The “Least Square non Negative” and the GA algorithm are compared by testing them one the same synthetic data. The result is that in some cases the “Least Square non Negative” seems to work better but in other cases the GA algorithm gives the best results. Both methods has got problems in determining the abundance of smaller plankton when large plankton or potentially air bubbles are present." @default.
• W643166363 created "2016-06-24" @default.
• W643166363 creator A5041554628 @default.
• W643166363 date "2006-01-01" @default.
• W643166363 modified "2023-09-24" @default.
• W643166363 title "Estimation of Size Distribution and Abundance of Zooplankton based on Measured Acoustic Backscattered Data" @default.
• W643166363 cites W1972795097 @default.
• W643166363 cites W2015486895 @default.
• W643166363 cites W2107259047 @default.
• W643166363 cites W2122379482 @default.
• W643166363 hasPublicationYear "2006" @default.
• W643166363 type Work @default.
• W643166363 sameAs 643166363 @default.
• W643166363 citedByCount "0" @default.
• W643166363 crossrefType "dissertation" @default.
• W643166363 hasAuthorship W643166363A5041554628 @default.
• W643166363 hasConcept C105795698 @default.
• W643166363 hasConcept C108469399 @default.
• W643166363 hasConcept C111368507 @default.
• W643166363 hasConcept C11413529 @default.
• W643166363 hasConcept C121332964 @default.
• W643166363 hasConcept C127313418 @default.
• W643166363 hasConcept C127413603 @default.
• W643166363 hasConcept C144024400 @default.
• W643166363 hasConcept C146978453 @default.
• W643166363 hasConcept C149923435 @default.
• W643166363 hasConcept C156273044 @default.
• W643166363 hasConcept C158836135 @default.
• W643166363 hasConcept C204323151 @default.
• W643166363 hasConcept C24890656 @default.
• W643166363 hasConcept C2908647359 @default.
• W643166363 hasConcept C33923547 @default.
• W643166363 hasConcept C39432304 @default.
• W643166363 hasConceptScore W643166363C105795698 @default.
• W643166363 hasConceptScore W643166363C108469399 @default.
• W643166363 hasConceptScore W643166363C111368507 @default.
• W643166363 hasConceptScore W643166363C11413529 @default.
• W643166363 hasConceptScore W643166363C121332964 @default.
• W643166363 hasConceptScore W643166363C127313418 @default.
• W643166363 hasConceptScore W643166363C127413603 @default.
• W643166363 hasConceptScore W643166363C144024400 @default.
• W643166363 hasConceptScore W643166363C146978453 @default.
• W643166363 hasConceptScore W643166363C149923435 @default.
• W643166363 hasConceptScore W643166363C156273044 @default.
• W643166363 hasConceptScore W643166363C158836135 @default.
• W643166363 hasConceptScore W643166363C204323151 @default.
• W643166363 hasConceptScore W643166363C24890656 @default.
• W643166363 hasConceptScore W643166363C2908647359 @default.
• W643166363 hasConceptScore W643166363C33923547 @default.
• W643166363 hasConceptScore W643166363C39432304 @default.
• W643166363 hasLocation W6431663631 @default.
• W643166363 hasOpenAccess W643166363 @default.
• W643166363 hasPrimaryLocation W6431663631 @default.
• W643166363 hasRelatedWork W1530289550 @default.
• W643166363 hasRelatedWork W1616207611 @default.
• W643166363 hasRelatedWork W1986667163 @default.
• W643166363 hasRelatedWork W2001346847 @default.
• W643166363 hasRelatedWork W2069443555 @default.
• W643166363 hasRelatedWork W2089174446 @default.
• W643166363 hasRelatedWork W2090320089 @default.
• W643166363 hasRelatedWork W2092699522 @default.
• W643166363 hasRelatedWork W2116324381 @default.
• W643166363 hasRelatedWork W2120856528 @default.
• W643166363 hasRelatedWork W2124908889 @default.
• W643166363 hasRelatedWork W2128630267 @default.
• W643166363 hasRelatedWork W2144756571 @default.
• W643166363 hasRelatedWork W2332683730 @default.
• W643166363 hasRelatedWork W2374304797 @default.
• W643166363 hasRelatedWork W2376497396 @default.
• W643166363 hasRelatedWork W242642862 @default.
• W643166363 hasRelatedWork W2789143513 @default.
• W643166363 hasRelatedWork W1662948036 @default.
• W643166363 hasRelatedWork W216737315 @default.
• W643166363 isParatext "false" @default.
• W643166363 isRetracted "false" @default.
• W643166363 magId "643166363" @default.
• W643166363 workType "dissertation" @default.