Coherent 3-D imaging of model targets

Marr, R.A.; Lammers, U.H.W.

doi:10.1109/nrc.1997.588323

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Understanding the central integrative processes which command and regulate sequences of behavior a t the level of individual neurons continues to have a high priority for neurophysiologists. There has been some progress towards this goal in vertebrates, for example in the mammalian cerebellar-cortex (Eccles, Ito, and Szentagothai, 1967;Marr, 1969) and in the cerebral cortex (Chow and Leiman, 1970). In the Mauthner cells of lower vertebrates (Wilson, 1959;Rovainen, 1967), direct correlations between behavioral acts and individual neuron activity has been possible.…”

Section: Introductionmentioning

confidence: 99%

The neuronal basis of behavior in Tritonia. III. Neuronal mechanism of a fixed action pattern

1973

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SUMMARYWe have investigated the roles played by numerous identified brain cells in initiating and controlling the coordinated sequence of movements of an instinctive escape-swimming sequence in an intact animal preparation of the nudibranch mollusc Tritonia diomedia. Intracellular electrical activity in different neurons has been correlated with the various phases of the behavior. We recognized four major stages in the response: (1) reflex local withdrawal; (2) preparation for swimming; ( 3 ) swimming; and (4) termination. We have located and studied brain cells whose activity is associated with the following aspects of swimming: withdrawal; elongation; triggering behavior; dorsal flexion; ventral flexion; and neurons which excite both dorsal and ventral flexor neurons simultaneously.We find that specific neurons play clearly defined and invariant roles in control of escape-swimming and that the neuronal circuitry underlying the coordination of the sequence is the same in different individuals of the species. Details of the neuronal circuitry and a number of the general functional attributes of interacting cell groups have been determined directly or inferred froin observations of cell to cell interactions. A preliminary model of the rieuronal apparatus which controls this behavior is discussed. The principal findings are: (1) a discrete group of electrically coupled neurons determines, by its output, whether or not escapeswimming will be executed; (2) the neuronal elements responsible for execution of the swimming stages of the sequence are maintained in an excited state for the required period, in part by a regenerative feedback system; ( 3 ) alternating bursts of impulses in functional antagonists are co-ordinated in part by reciprocal inhibition between them; and (4) termination of the sequence occurs abruptly a t a particular phase in the swimming cycle and appears to be an active neural process, rather than a simple running-down.

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Section: Introductionmentioning

confidence: 99%

The neuronal basis of behavior in Tritonia. III. Neuronal mechanism of a fixed action pattern

1973

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“…Hence, one has to perform a near-field measurement. In the study of wave-target interaction, high resolution radar images have been produced using near-field measurement techniques [2][3][4][5][6]. Vector Network Analyzer (VNA) is normally used to transmit a string of discrete frequency over wide bandwidth and measure the phase and magnitude of target backscatter with a scanning mechanism.…”

Section: Introductionmentioning

confidence: 99%

High Resolution 3-D Imaging

Chiang¹,

Chung²

2005

Journal of Electromagnetic Waves and Applications

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A three dimensional radar image can be constructed from scanning microwave measurements. A Vector Network Analyzer has been used for wideband phase and magnitude measurements of radar return. Quasi-monostatic horn antenna configuration is chosen to transmit and receive the electromagnetic wave. Measured target is placed on a polystyrene foam pedestal at 5 meters distance away from the 2-D planar scanner. A wide bandwidth, ranging from 3 GHz to 18 GHz gives rise to very fine range resolution. A time domain gating technique is used to remove spurious signals from the desired signal of the radar target. Range Migration Technique has been used to produce a 3-D radar image. Indoor measurements have been performed on conducting spheres to validate the software. A high resolution 3-D radar image for spheres has been obtained. Analysis of the radar crosssections shows good correlation with theoretical values. Subsequently, the radar cross-section of an oil palm tree was measured and analyzed.

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Iterative MMSE method and recurrent Kalman procedure for ISAR image reconstruction

Lazarov

2001

IEEE Trans. Aerosp. Electron. Syst.

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Coherent 3-D imaging of model targets

Cited by 6 publications

References 2 publications

The neuronal basis of behavior in Tritonia. III. Neuronal mechanism of a fixed action pattern

The neuronal basis of behavior in Tritonia. III. Neuronal mechanism of a fixed action pattern

High Resolution 3-D Imaging

Iterative MMSE method and recurrent Kalman procedure for ISAR image reconstruction

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