Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703337
J. Viheriala, A. Laakso, M. Dumitrescu, J. Tommila, K. Haring, T. Leinonen, S. Ranta, M. Pessa
Distributed feedback lasers with third-order surface gratings obtained by lateral corrugations of the ridge waveguide have been fabricated using low-cost nanoimprint lithography. The lasers, emitting in the 980 nm wavelength range exhibited stable single-longitudinal-mode operation with side-mode suppression ratios up to 50 dB.
{"title":"Surface-grating-based distributed feedback lasers fabricated using nanoimprint lithography","authors":"J. Viheriala, A. Laakso, M. Dumitrescu, J. Tommila, K. Haring, T. Leinonen, S. Ranta, M. Pessa","doi":"10.1109/SMICND.2008.4703337","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703337","url":null,"abstract":"Distributed feedback lasers with third-order surface gratings obtained by lateral corrugations of the ridge waveguide have been fabricated using low-cost nanoimprint lithography. The lasers, emitting in the 980 nm wavelength range exhibited stable single-longitudinal-mode operation with side-mode suppression ratios up to 50 dB.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"7 1","pages":"95-98"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79800407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703418
A. Florescu, A. Radoi, C. Radoi, D. Vizireanu
The paper presents different methods of using MC34063 and muA78S40 monolithic switching regulator subsystems to construct dual switching power supplies with step-down and step-up converters. General description of MC34063 and muA78S40 operation modes, mathematical design applied on numerical examples, PSpice under ORCAD simulation of the whole switching power supply and practical implementations are included. Some practical considerations are also specified.
{"title":"Three dual switching power supplies modules","authors":"A. Florescu, A. Radoi, C. Radoi, D. Vizireanu","doi":"10.1109/SMICND.2008.4703418","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703418","url":null,"abstract":"The paper presents different methods of using MC34063 and muA78S40 monolithic switching regulator subsystems to construct dual switching power supplies with step-down and step-up converters. General description of MC34063 and muA78S40 operation modes, mathematical design applied on numerical examples, PSpice under ORCAD simulation of the whole switching power supply and practical implementations are included. Some practical considerations are also specified.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"16 1","pages":"331-334"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84008327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703423
P. Anghelescu, E. Sofron, C. Rîncu, Vasile-Gabriel Iana
In this paper, we present a new encryption algorithm based on the programmable cellular automata (PCA) theory. The cryptosystem is featured by its large key space and high speed due to cellular automatapsilas parallel information processing property. Moreover, the encryption and decryption devices share the identical modules, which give appropriate solutions for implementation of the cryptographic modules in high speed applications. So the scheme could be implemented efficiently in hardware, in reconfigurable hardware structures. The design has been implemented in both: in software using C# programming language and in hardware on a XC3S500E FPGA board using VHDL.
{"title":"Programmable cellular automata based encryption algorithm","authors":"P. Anghelescu, E. Sofron, C. Rîncu, Vasile-Gabriel Iana","doi":"10.1109/SMICND.2008.4703423","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703423","url":null,"abstract":"In this paper, we present a new encryption algorithm based on the programmable cellular automata (PCA) theory. The cryptosystem is featured by its large key space and high speed due to cellular automatapsilas parallel information processing property. Moreover, the encryption and decryption devices share the identical modules, which give appropriate solutions for implementation of the cryptographic modules in high speed applications. So the scheme could be implemented efficiently in hardware, in reconfigurable hardware structures. The design has been implemented in both: in software using C# programming language and in hardware on a XC3S500E FPGA board using VHDL.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"11 1","pages":"351-354"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80909568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703362
B. Firtat, R. Iosub, D. Necula, E. Franti, F. Babarada, C. Moldovan, F. Lazo
The extracellular potential simultaneous recording permits the investigation of the central nervous activity. The paper presents the design and manufacturing steps of a five electrodes microprobe for recording the electrical activity of neural cells and tissues integrated on the same chip with the electronics. The specific fabrication processes of the integrated microprobe are presented. An implantable neural microprobe is going to be developed to enable the correlation between electrical activity in the human nervous system and externally psychoelectrical stimuli. The electronics accomplish the separation and reduction of the biological noise recording.
{"title":"Simulation, design and microfabrication of multichannel microprobe for bioelectrical signals recording","authors":"B. Firtat, R. Iosub, D. Necula, E. Franti, F. Babarada, C. Moldovan, F. Lazo","doi":"10.1109/SMICND.2008.4703362","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703362","url":null,"abstract":"The extracellular potential simultaneous recording permits the investigation of the central nervous activity. The paper presents the design and manufacturing steps of a five electrodes microprobe for recording the electrical activity of neural cells and tissues integrated on the same chip with the electronics. The specific fabrication processes of the integrated microprobe are presented. An implantable neural microprobe is going to be developed to enable the correlation between electrical activity in the human nervous system and externally psychoelectrical stimuli. The electronics accomplish the separation and reduction of the biological noise recording.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"20 1","pages":"177-180"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83919899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703364
C. Miclea, C. Tănăsoiu, A. Iuga, I. Spanulescu, C. Miclea, C. Plăviţu, L. Amarande, M. Cioangher, L. Trupina, C. Miclea, T. Tanasoiu
A high quality PZT type material was designed and produced in order to be used as sensor for a high internsity siren. Two disks from this materials were assembled into a parallel bimorph type transducer with an intermediate metallic plate. This assembly behaves like an acoustic resonator in the high frequency audio range. The fundamental of the flexural mode for a free resonator is taken into account. Its frequency dependence on the geometry of the system and on its material properties is computed using the results for a circular plate with clamped edges and an observation on the equivalence between the movement of a particular part of a resonator in a stationary state and the movement of that part separated from the resonator but with the same border conditions. Acoustical and impedance measurements were made in order to appreciate the influence of the metallic plate on the frequency. In order to increase the acoustic emission a frontal cardboard horn was added to the resonator.
{"title":"A high performance PZT type material used as sensor for an audio high frequency piezoelectric siren","authors":"C. Miclea, C. Tănăsoiu, A. Iuga, I. Spanulescu, C. Miclea, C. Plăviţu, L. Amarande, M. Cioangher, L. Trupina, C. Miclea, T. Tanasoiu","doi":"10.1109/SMICND.2008.4703364","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703364","url":null,"abstract":"A high quality PZT type material was designed and produced in order to be used as sensor for a high internsity siren. Two disks from this materials were assembled into a parallel bimorph type transducer with an intermediate metallic plate. This assembly behaves like an acoustic resonator in the high frequency audio range. The fundamental of the flexural mode for a free resonator is taken into account. Its frequency dependence on the geometry of the system and on its material properties is computed using the results for a circular plate with clamped edges and an observation on the equivalence between the movement of a particular part of a resonator in a stationary state and the movement of that part separated from the resonator but with the same border conditions. Acoustical and impedance measurements were made in order to appreciate the influence of the metallic plate on the frequency. In order to increase the acoustic emission a frontal cardboard horn was added to the resonator.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"55 1","pages":"185-188"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77213187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703346
R. Rusu, M. Damaceanu, M. Brumǎ, R. Tigoianu, A. Muller
Aromatic polyimides have been prepared by solution polycondensation reaction of different aromatic diamines having preformed 1,3,4-oxadiazole ring with naphthalene-1,4,5,8-tetracarboxylic acid dianhydride (DNTA) or with a mixture of this dianhydride with hexafluoroisopropylidene-dianhydride (6FDA). The copolyimides containing naphthalene and flexible hexafluoroisopropylidene groups were soluble in polar amidic solvents and their solutions gave flexible thin films when spread onto glass plates and very thin films with smooth surface by spin coating. The thermal stability and glass transition temperature of these polyimides and copolyimides were measured and compared with regard to the influence of naphthalene units on these physical properties. The UV-vis and photoluminescence properties were also investigated.
{"title":"Aromatic polyimides for optoelectronic applications","authors":"R. Rusu, M. Damaceanu, M. Brumǎ, R. Tigoianu, A. Muller","doi":"10.1109/SMICND.2008.4703346","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703346","url":null,"abstract":"Aromatic polyimides have been prepared by solution polycondensation reaction of different aromatic diamines having preformed 1,3,4-oxadiazole ring with naphthalene-1,4,5,8-tetracarboxylic acid dianhydride (DNTA) or with a mixture of this dianhydride with hexafluoroisopropylidene-dianhydride (6FDA). The copolyimides containing naphthalene and flexible hexafluoroisopropylidene groups were soluble in polar amidic solvents and their solutions gave flexible thin films when spread onto glass plates and very thin films with smooth surface by spin coating. The thermal stability and glass transition temperature of these polyimides and copolyimides were measured and compared with regard to the influence of naphthalene units on these physical properties. The UV-vis and photoluminescence properties were also investigated.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"188 1","pages":"125-128"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73138875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703339
M. Dragoman, G. Konstantinidis, D. Dragoman, D. Neculoiu, A. Cismaru, F. Coccetti, R. Plana, H. Harnagel, A. Kostopoulos, R. Buiculescu
This paper presents RF-NEMS devices (resonators, oscillators and switches) for microwave applications based on carbon nanotube and graphene. We have demonstrated that innovative and cost-effective devices with good performances can be produced combining the NEMS principles and microwave techniques.
{"title":"RF NEMS based on carbon nanotubes and graphene","authors":"M. Dragoman, G. Konstantinidis, D. Dragoman, D. Neculoiu, A. Cismaru, F. Coccetti, R. Plana, H. Harnagel, A. Kostopoulos, R. Buiculescu","doi":"10.1109/SMICND.2008.4703339","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703339","url":null,"abstract":"This paper presents RF-NEMS devices (resonators, oscillators and switches) for microwave applications based on carbon nanotube and graphene. We have demonstrated that innovative and cost-effective devices with good performances can be produced combining the NEMS principles and microwave techniques.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"41 1","pages":"103-106"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73751000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703365
A. Bragaru, M. Miu, F. Craciunoiu, I. Kleps, M. Simion, T. Ignat
Recently, for sensors application, porous silicon has received a great attention due to the high specific surface area and the easy fabrication using standard processes from silicon technology. The design and technology for a resistive humidity sensor full integrated on silicon is presented in this paper. This sensor integrates both the interdigitated microelectrodes array for detection, and the resistance for accelerated desorbtion process controlled by a temperature sensor.
{"title":"Technological fabrication of the humidity sensors on nanostructurated membranes","authors":"A. Bragaru, M. Miu, F. Craciunoiu, I. Kleps, M. Simion, T. Ignat","doi":"10.1109/SMICND.2008.4703365","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703365","url":null,"abstract":"Recently, for sensors application, porous silicon has received a great attention due to the high specific surface area and the easy fabrication using standard processes from silicon technology. The design and technology for a resistive humidity sensor full integrated on silicon is presented in this paper. This sensor integrates both the interdigitated microelectrodes array for detection, and the resistance for accelerated desorbtion process controlled by a temperature sensor.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"30 1","pages":"189-192"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74978524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703448
A. Rusu, N. Golescu, C. Ravariu
One of the challenges in the biomedical engineering domain is the Telemedicine. The remote diagnosis, automate instruments for drug delivery or mobile platforms for domestic applications are common targets accepted by the medical insurance companies form the world wide. The Telemedicine need the development of various tools for home analysis, in order to send all the collected analysis to a medical center or to a database on Internet. In this paper is proposed a simple and cheap platform for the Electro-cardio-gram recording on the Personal Computer. The platform consists in a hardware part and a software part. The general electrical circuit for the ECG recording was adapted in order to be available at home applications. The amplified signal is then connected via the microphone muff to PC. A dedicated software converts the input ldquonoiserdquo signal into an ECG trace. In this way, the ECG becomes available, in the simpler mode directly on the computer screen, without any expensive tracer.
{"title":"Manufacturing and tests of a mobile ecg platform","authors":"A. Rusu, N. Golescu, C. Ravariu","doi":"10.1109/SMICND.2008.4703448","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703448","url":null,"abstract":"One of the challenges in the biomedical engineering domain is the Telemedicine. The remote diagnosis, automate instruments for drug delivery or mobile platforms for domestic applications are common targets accepted by the medical insurance companies form the world wide. The Telemedicine need the development of various tools for home analysis, in order to send all the collected analysis to a medical center or to a database on Internet. In this paper is proposed a simple and cheap platform for the Electro-cardio-gram recording on the Personal Computer. The platform consists in a hardware part and a software part. The general electrical circuit for the ECG recording was adapted in order to be available at home applications. The amplified signal is then connected via the microphone muff to PC. A dedicated software converts the input ldquonoiserdquo signal into an ECG trace. In this way, the ECG becomes available, in the simpler mode directly on the computer screen, without any expensive tracer.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"10 1","pages":"433-436"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75082080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-09DOI: 10.1109/SMICND.2008.4703415
N. Tang
The spin-polarized tunneling current through a double barrier resonant tunneling diode (RTD) with ferromagnetic GaMnN emitter/collector is investigated theoretically. Two distinct spin splitting peaks can be observed at current-voltage (I-V) characteristics at low temperature. The spin polarization decreases with the temperature due to the thermal effect of electron density of states. When charge polarization effect is considered at the heterostructure, the spin polarization is enhanced significantly. A highly spin polarized current can be obtained depending on the polarization charge density.
{"title":"Spin-dependent current in resonant tunneling diode with ferromagnetic GaMnN layers","authors":"N. Tang","doi":"10.1109/SMICND.2008.4703415","DOIUrl":"https://doi.org/10.1109/SMICND.2008.4703415","url":null,"abstract":"The spin-polarized tunneling current through a double barrier resonant tunneling diode (RTD) with ferromagnetic GaMnN emitter/collector is investigated theoretically. Two distinct spin splitting peaks can be observed at current-voltage (I-V) characteristics at low temperature. The spin polarization decreases with the temperature due to the thermal effect of electron density of states. When charge polarization effect is considered at the heterostructure, the spin polarization is enhanced significantly. A highly spin polarized current can be obtained depending on the polarization charge density.","PeriodicalId":6406,"journal":{"name":"2008 IEEE International Conference on Semiconductor Electronics","volume":"10 1","pages":"325-328"},"PeriodicalIF":0.0,"publicationDate":"2008-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77321564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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