| 1. |
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| 2. |
- Andersson, Birgitta, et al.
(författare)
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Long-term charge retention on PWBs
- 2005
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Ingår i: Journal of Electrostatics. - : Elsevier BV. - 0304-3886 .- 1873-5738. ; 63:6-10, s. 597-602
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Tidskriftsartikel (refereegranskat)abstract
- A sample of printed wiring boards, isolated from ground, has been charged tribo-electrically and the charge decay process has been studied with focus on the long-term charge decay behaviour. It was found that the time constant 1/e did not say much about the proceeding decay process. Instead a second-order approximation model for the measured decay curves has been suggested.
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| 3. |
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| 4. |
- Boustedt, Katarina, et al.
(författare)
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Flip chip as an enabler for MEMS packaging
- 2002
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Ingår i: 52nd Electronic Components and Technology Conference, 2002. Proceedings.. - 0780374304 ; , s. -128
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Konferensbidrag (refereegranskat)abstract
- With the recent trends in microelectronics to move more and more towards incorporating MEMS (micro electro mechanical systems) structures, lowering the overall cost becomes vital. One major cost driver in today's MEMS is the packaging. Many of the MEMS structures require some level of low pressure for full quality operation, and some may even need vacuum to function properly. Different MEMS packaging strategies exist on the market and they can be divided into two different approaches. The first one protects the wafer temporarily during wafer scribing or dicing and the second one provides a permanent seal to the wafer through full wafer bonding before scribing and dicing. The latter, permanent methods allows for selecting very low cost packaging without hermeticity as a requirement, whereas in the temporary seal methods the seal is removed after dicing and the sensitive structures become unprotected again. Using flip chip for MEMS has the benefit of providing MEMS structures with a covering lid, the chip itself. A number of flip chip MEMS interconnection methods presented in literature are described.
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| 5. |
- Boustedt, Katarina, et al.
(författare)
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Wafer Bonding Technologies for MEMS Packaging
- 2002
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Ingår i: Proceedings : the IMAPS Nordic Annual Conference : Stockholm, 2002, 29 September-2 October 2002.. - 9519800247 - 9789519800240 ; , s. -127
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 6. |
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| 7. |
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| 8. |
- Ranjbar, Parivash, 1968-, et al.
(författare)
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Haptic technical aids Distime, Monitor, Good vibrations, Ready-Ride and VibroBraille for improvement of Time perception, Environmental perception, music perception, mobility and communication for persons with deafblindness : Tactile aids
- 2017
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Ingår i: Tactile aids. - Ahlborg.
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Konferensbidrag (refereegranskat)abstract
- There are approx. 1300 people with deafblindnes (DB) in Sweden where about 100 of them are with complete deafness (D) and blindness (B). The number will reach about 30000 if we also include people older than 65 with severe visual impairment (VI) and hearing impairment (HI) and several million worldwide. Difficulties in time perception, environmental perception, music perception, mobility, social participation and communication are examples of their frequent problems. Five haptic technical aids are developed to reduce these problems. Distime is an application in a smart phone to inform the user about the planned activities by choosing different information channel depending on the sense that works and her/his ability. The activities can be presented as sound or vibrations for users with B; as images, movies and also as vibrations for those with D and vibrations for those with DB. Monitor informs users with D and DB about ongoing events with the aim to increase their environmental perception. Using an specific algorithm for environmental sounds, it converts the audible sounds produced by events to sensible vibrations which can be sensed and interpreted as events. Good Vibrations uses an specific algorithm for music and converts the audible music to vibrations which can be felt with the aim to increase music perception for users with severe HI, D/DB as well as for users with normal hearing who want extra enhanced experience of the music. Ready-Ride is a positioning and communication aid to improve the mobility of riders with severe VI, B or DB. It is used for distance communication between a trainer and a rider with VI where the trainer can send information about the rider’s position give commands or feedback about the riding. VibroBraille informs users with B/DB about the short notifications received from different applications in her/his cell phone. It converts the text to its corresponding Braille pattern where the active points are vibrating.
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| 9. |
- Ranjbar, Parivash, 1968-, et al.
(författare)
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Haptic Technical Aids for EnvironmentalPerception, Time Perception and Mobility (in a Riding Arena) for Persons with Deafblindness
- 2014
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Ingår i: HAPTICS: NEUROSCIENCE, DEVICES, MODELING, AND APPLICATIONS, PT II. - Berlin : Springer Berlin/Heidelberg. - 9783662441961 ; , s. 488-490
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This demonstration presents three vibrotactile aids to support personswith deafblindness. One aid, Monitor, consists of a microphone that detectssounds from events which are then processed as a signal that is adapted to thesensitivity range of the skin. The signal is sent as vibrations to the user withdeafblindness, who can interpret the pattern of the vibrations in order to identifythe type and position of the event/source that produced the sounds. Another aid,Distime, uses a smart phone app that informs the user with cognitive impairmentand deafblindness about a planned activity through; audio, visual or tactileinteraction that is adapted to the abilities of each individual. The last aid, Ready-ride, uses two smart phones and up to 11 vibrators that help the horse back riderwith deafblindness to communicate with the instructor from a distance viavibrators placed on different parts of the riders body e.g. wrist, thigh, back, ankle.
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| 10. |
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| 11. |
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| 12. |
- Ranjbar, Parivash, 1968-, et al.
(författare)
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Identification of vibrotactile morse code on abdomen and wrist
- 2017
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Ingår i: International Journal of Engineering Technology and Scientific Innovation. - : IJETSI. - 2456-1851. ; 1:4, s. 351-366
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Tidskriftsartikel (refereegranskat)abstract
- Morse code has been used as a communications system at a distance to transmit text through tone or light pulses. This comparative study aims to test and evaluate the vibrotactile identification of Morse coded signals communicating instructions for movement. The pulses were presented on abdomen and wrist among 14 males (40-85 yr) experienced in acoustic Morse code and the rate of pulses was 12 words per minute using a Vibration Motor mounted in a plastic holder. There identification results were statistically significantly better on wrist compared to abdomen. Words were identified significantly better on the wrist as compared to abdomen but the identification results of the letters were equally good in both placements. There was a negative correlation between age and the pooled identification results tested on wrist PCC r=-0.45 (p<0.02). The participants rank ordered the wrist, over the abdomen, as the best place for positioning the vibrator. The results support haptic/tactile interaction research in positioning and communication system. Our future plans are to apply the results to the project "Ready Ride" for instructions for horseback riding for people with deafblindness as well as activity and movement for elderly people with impaired vision and hearing.
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| 13. |
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| 14. |
- Ranjbar, Parivash, 1968-, et al.
(författare)
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Ready-Ride : A tactile communications aid to improve the mobility of persons with deafblindness in a riding arena
- 2018
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Ingår i: International Journal of Engineering Technology and Scientific Innovation. - : IJETSI. - 2456-1851. ; 3:1, s. 56-62
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Persons with severe visual impairment (VI), blindness (B) and deafblindness (DB) have difficulties in mobility and thereby poor leisure time. Activities as horseback riding become difficult especially for persons with DB who communicate with an assistant/instructor via tactile sign language and need to stop and get information/feedback.Ready-Ride, a tactile communications system can improve the mobility of the persons with B and DB by making distance communication possible. It consists of transmitter with four buttons which communicates via Bluetooth with a receiver connected to four vibrators via cables. The button(s) are used to activate the specific vibrator(s). The messages can consist of simple "right" or "left" or more complex codes for any needed instruction.Ready-Ride has been evaluated in the riding arena by persons with B and DB who consider it as mobile, easy to use and no need for long introduction or installation of any software/hardware. The vibrations are intuitive, easy to detect and distinguish. The system gives the rider information tactually without disturbing other persons or horses nearby. Using Ready-Ride they got more time to ride and the quality was increased since they could communicate while riding and get immediate feedback directly.One of the riders with DB has been using the system during a long period, in average one lesson a week and participated in different competitions with good results. She says that the use of Ready- Ride is crucial for continued riding, "Ready-Ride is a MUST BEE".
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| 15. |
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| 16. |
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| 17. |
- Ranjbar, Parivash, 1968-, et al.
(författare)
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Vibrotactile identification of signal-processed sounds from environmental events
- 2009
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Ingår i: Journal of rehabilitation research and development. - 0748-7711 .- 1938-1352. ; 46:8, s. 1021-1036
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To compare three different signal-processing principles (eight basic algorithms), transposing, modulating and filtering, and to find the principle(s)/algorithm(s) that result in the best tactile identification of environmental sounds.Subjects: Nineteen volunteers (9F/10M), deaf or profoundly hearing impaired, between 18-50 yr. Method: Sounds produced by 45 representative environmental events were processed using the different algorithms and presented to subjects as tactile stimuli using a wide-band stationary vibrator. Eight algorithms based on the three principles (one unprocessed, used as reference) were compared. The subjects identified the stimuli by choosing one among ten alternatives drawn from the 45 events. Result and conclusion: Algorithm and subject were significant (RM-ANOVA, p<0.001) factors affecting the results. There were also large differences between individuals regarding which algorithm was best. The test-retest variability was small (Mean±95%CI: 8±3 percentage units), and no correlation between identification score and individual vibratory thresholds was found. One transposing algorithm and two modulating algorithms led to significantly (p<0.05) better results than did the unprocessed signals. Thus, the two principles of transposing and modulating were appropriate, whereas filtering was unsuccessful. In future work, the two transposing algorithms and the modulating algorithms will be used in tests with a portable vibrator for the deafblind.
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| 18. |
- Salamati, Mahnaz, et al.
(författare)
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Electromagnetic signatures as a tool for connectionless test
- 2003
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Ingår i: IEEE Design & Test of Computers. - 0740-7475. ; 20:2, s. 26-30
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Tidskriftsartikel (refereegranskat)abstract
- When we test boards, we usually think in terms of traditional electrical test (in-circuit, flying probe) and nonelectrical test (optical, x-ray). This Orebro University article develops an alternative, connectionless technique based on scanning the electromagnetic field generated by active on-board devices. Could this make it into industry as an additional diagnostic tool?
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| 19. |
- Salamati, Mahnaz, et al.
(författare)
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Electromagnetic signatures as a tool for Connectionless Test (CT)
- 2002
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Today’s electronic products and subassemblies are highly integrated, miniaturized devices having complex functionality. Final test and troubleshooting using conventional test points, probes and bed-of-nails techniques are becoming harder, and are in many cases not even possible. Further, due to increasing production volumes, the time needed for testing is a critical factor. An alternative way to test a device is to employ Connectionless Test (CT). The idea is to measure the electromagnetic (EM) field surrounding the DeviceUnder Test (DUT) during different modes of operation.Using the CAD data for the DUT, an Electromagnetic signature can be created from the measured EM data.The obtained signature is matched to earlier signatures stored in an adaptive database that is being updated continuously. The database not only contains signatures from “known good” devices, but also signatures obtained from some typical failure types. In this way, the DUT can be classified as working properly, suffering from a previously known type of failure or having a “new”, hitherto unknown malfunction. Since the electromagnetic signature also contains spatial information, it is an interesting tool in thetroubleshooting process. Besides the type of failure, an estimate of the location of the problem may be extracted from the signature. Initial practical tests have shown that the CT method outlined above works for both “analog” as well as “digital” electronic products having medium complexity.
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| 20. |
- Samadi, Mahnaz, 1965-, et al.
(författare)
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Connectionless Testing
- 2005
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 21. |
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| 22. |
- Stranneby, Dag, 1955-
(författare)
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A Primer on PIM
- 2014
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Ingår i: Electronic environment. - Göteborg : Just Rivista AB. ; :4, s. 10-12
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- PIM is an acronym for Passive InterModulation, an interference problem in wireless systems. The problem is not new, but has been known since long time back by designers of, for instance cell phone systems, space probes, connectors, coaxial cables, antennas and filters. The problem most frequently occurs, when dealing with high RF-currents in confined spaces. In this text, the basic theories behind PIM will be briefly discussed.
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| 23. |
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| 24. |
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| 25. |
- Stranneby, Dag, 1955-
(författare)
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Assigning power and frequency to links in HF radio networks using a Neural Network approach
- 1995
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Ingår i: HF 95 Conference Proceedings. - Växjö. - 9163035537
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A method af assigning transmitting power and frequency to narrow band links exposed to nonselective fading and self induced interference in an HF radio data network is suggested. The method uses vector optimization by means of a feedforward neural network.The network performance measure used is a weighted sum of mutual information for all links in the network. The suggested assignment method can be used for power and frequency planning using simulated fading and interference data. It can also be used with actual measured link data in an adaptive on-line system. The method is capable of handling links utilizing frequency diversity and can also take LPD/LPI aspects into account. Simulation results indicate that the degree of correlation in space and frequency between different links palys ab important role in the assignment process.
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| 26. |
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| 27. |
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| 28. |
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| 29. |
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| 30. |
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| 31. |
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| 32. |
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| 33. |
- Stranneby, Dag, 1955-
(författare)
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ESD risks in industrial environments
- 2013
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Ingår i: Electronic environment. - Göteborg : Just Rivista AB. ; :4, s. 10-13
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The risks caused by Electrostatic discharges (ESD), where electronic components may be damaged in Electronic production and testing facilities, are well known. ESD however, also presents problems and major risk in many other industrial environments, for instance Chemical Process plants. This presentation is an overview of ESD related problems in general.
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| 34. |
- Stranneby, Dag, 1955-
(författare)
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Introduction to Passive Intermodulation PIM
- 2014
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- PIM is an acronym for Passive InterModulation, an interference problem in wireless systems. The problem is not new, but has been known since long time back by designers of, for instance cell phone systems, space probes, connectors, coaxial cables, antennas and filters. The problem most frequently occurs, when dealing with high RF-currents in confined spaces. In this text, the basic theories behind PIM will be briefly discussed.
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| 35. |
- Stranneby, Dag, 1955-
(författare)
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Mätmetoder och problem
- 2009
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Ingår i: Electronic environment. - Göteborg : Just Rivista AB. ; :4, s. 26-30
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Vid ESD-skyddsarbete har man ofta behov av att mäta till exempel laddning, potential, spänning, kapacitans och resistans. Ofta handlar det om höga spänningar, små laddningar, små kapacitanser och höga resistanser. Etablerade metoder och instrument finns, men hur noggranna är dessa, och vad mäter man egentligen? I denna genomgång av metoder och instrument belyses mättekniska begränsningar och felkällor som kan ställa till problem, och i värsta fall göra mätningarna oanvändbara.
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| 36. |
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| 37. |
- Stranneby, Dag, 1955-, et al.
(författare)
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Ready-ride :
- 2007
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Ingår i: 14th Deafblind International World Conference 25th–30th September 2007 Burswood Convention Centre Perth, Western Australia, Australia. Conference Proceedings. ; , s. 737-740
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Horse riding is a popular sport among young deaf people in Sweden. A gradual decrease in visual acuity is also not very uncommon, and thus some young horse enthusiasts encounter increasing difficulties in performing their favorite sport with autonomy. In collaboration with Segersjö Fälttävlan, a system has been designed and tested at Ahlsén Research Institute to provide position information in the riding school and vibratory transmitted information to support the rider’s orientation.There are two alternative positioning systems. One is based on a fixed sensing system localizing the rider. In the other system, the instructor provides the position using a hand-held PC with a simple point-and-click interface. The position of the rider is indicated on the screen pointer or a mouse. The information is coded in different ways. Three alternatives are being considered at present. First, the deviation from the pre-determined route is indicated in terms of both angular deviation and distance. Second, the change in direction needed to return to the route is indicated. Third, the conventional letter codes are indicated by signaling the angular deviation to the closest letter at each point in time.The information is transferred to nine vibrators, localized on a waist belt or a headband. Experiments where the rider is wearing a vest with vibrators on the back, is also in progress. In the communicating system using pre-determined instructions, instructions are given using one- or two-letter Morse codes. With the presented construction, the system can be used in a riding school that has a fixed positioning system mounted or in any riding school by using the instructor-controlled positioning system.
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| 38. |
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| 40. |
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