Pub Date : 2018-01-01DOI: 10.1051/MATECCONF/201821004054
Ritesh Chugh
As organisational knowledge is greatly dependent on the tacit knowledge that its employees possess, it is important to pursue strategies that encourage sharing of employees tacit knowledge. However, tacit knowledge sharing can be better promoted by understanding the barriers and enablers of tacit knowledge transfer. As universities are seen as the flag bearers of knowledge creation and dissemination, this paper focuses on identifying the barriers and enablers of tacit knowledge transfer in universities. A qualitative research method was utilised for this study in which interviews of academics from four Australian universities were carried out. The reporting of data is based on a structured interpretative approach drawing demonstrative examples from the interview transcripts. The findings suggest that human, social and culture factors are addressed to ensure successful transfer of tacit knowledge. For effective transfer of tacit knowledge, universities need to create conditions that strengthen the enablers and suppress the barriers
{"title":"Tacit Knowledge Transfer in Australian Universities: Exploring the Barriers and Enablers","authors":"Ritesh Chugh","doi":"10.1051/MATECCONF/201821004054","DOIUrl":"https://doi.org/10.1051/MATECCONF/201821004054","url":null,"abstract":"As organisational knowledge is greatly dependent on the tacit knowledge that its employees possess, it is important to pursue strategies that encourage sharing of employees tacit knowledge. However, tacit knowledge sharing can be better promoted by understanding the barriers and enablers of tacit knowledge transfer. As universities are seen as the flag bearers of knowledge creation and dissemination, this paper focuses on identifying the barriers and enablers of tacit knowledge transfer in universities. A qualitative research method was utilised for this study in which interviews of academics from four Australian universities were carried out. The reporting of data is based on a structured interpretative approach drawing demonstrative examples from the interview transcripts. The findings suggest that human, social and culture factors are addressed to ensure successful transfer of tacit knowledge. For effective transfer of tacit knowledge, universities need to create conditions that strengthen the enablers and suppress the barriers","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"1 1","pages":"04054"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82727705","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293413
M. Caruso, R. Foster, H. Graber
The Arabian Sea is characterized by an annually reversing circulation influenced by strong monsoon winds. The southwest monsoon that occurs during summer drives a northward boundary current along the coast of Somalia. During the winter monsoon, the southward flowing Somali Current merges with the northward flowing East African Coastal Current to form the eastward flowing South Equatorial Counter Current. This pattern shifts during the summer monsoon as the East African Coastal Current feeds the reversing Somali Current. Part of this northward flow retroflects from the coast at about 4°N to form the Southern Gyre while the remaining flow continues north past the Gulf of Aden or detaches at about 10°N to form the Great Whirl. Sentinel-1 synthetic aperture radar (SAR) data were acquired over the Somali Current in 2016 during the summer and winter monsoons. The Somali Current along the coast, the Southern Gyre and the Great Whirl are well developed at the time of the summer acquisition. The covariability of the atmospheric boundary layer and sea surface temperature was observed at high resolution over the Western Arabian Sea. Wind stress curl derived from the SAR data show the effects of the cold upwelled water and the Somali Current on the wind speed. Significant organized large eddies (OLEs) are also observed east of the Somali Current. During the winter monsoon, the Somali Current, Southern Gyre and Great Whirl are absent. The wind stress curl computed from the SAR data confirm this and do not show distinct circulation patterns or OLEs.
{"title":"SAR observations of organized large eddies over the Somali current","authors":"M. Caruso, R. Foster, H. Graber","doi":"10.1109/PIERS-FALL.2017.8293413","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293413","url":null,"abstract":"The Arabian Sea is characterized by an annually reversing circulation influenced by strong monsoon winds. The southwest monsoon that occurs during summer drives a northward boundary current along the coast of Somalia. During the winter monsoon, the southward flowing Somali Current merges with the northward flowing East African Coastal Current to form the eastward flowing South Equatorial Counter Current. This pattern shifts during the summer monsoon as the East African Coastal Current feeds the reversing Somali Current. Part of this northward flow retroflects from the coast at about 4°N to form the Southern Gyre while the remaining flow continues north past the Gulf of Aden or detaches at about 10°N to form the Great Whirl. Sentinel-1 synthetic aperture radar (SAR) data were acquired over the Somali Current in 2016 during the summer and winter monsoons. The Somali Current along the coast, the Southern Gyre and the Great Whirl are well developed at the time of the summer acquisition. The covariability of the atmospheric boundary layer and sea surface temperature was observed at high resolution over the Western Arabian Sea. Wind stress curl derived from the SAR data show the effects of the cold upwelled water and the Somali Current on the wind speed. Significant organized large eddies (OLEs) are also observed east of the Somali Current. During the winter monsoon, the Somali Current, Southern Gyre and Great Whirl are absent. The wind stress curl computed from the SAR data confirm this and do not show distinct circulation patterns or OLEs.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"225 1","pages":"1720-1725"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77498557","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293527
C. Lee, T. Jang, D. Kang, H. Son, C. Byeon, C. Park
This paper presents a D-band six-stage low noise amplifier design in 65nm CMOS process. The single stage amplifier consists of combined cascode topology and common source topology to achieve high gain and save power consumption. For a high-data rate communication system, the wideband characteristic is very important. In order to enhance the 3 dB bandwidth, a two-center frequency technique and inductive feedback technique are used. The odd and even stages are designed to operate at 115 GHz and 125 GHz, respectively. In addition, the amplifier was realized by a conjugate matching technique to achieve low-loss between each stage. The measured results show that the low noise amplifier can provide a gain of 22.4dB with a 3dB bandwidth of 16GHz. The measured OP1dB is −4.5 dBm at 120 GHz. The minimum noise figure was 11.4dB at 117 GHz. The core chip size is 980 × 200 m2 and the power consumption of the proposed low noise amplifier is 61mW at a supply voltage of 1.7V. To the authors' knowledge, this is the best performance (gain −3dB bandwidth product) with low power consumption in 65nm CMOS at D-band frequency.
{"title":"A CMOS D-band low noise amplifier with 22.4dB gain and a 3dB bandwidth of 16GHz for wireless chip to chip communication","authors":"C. Lee, T. Jang, D. Kang, H. Son, C. Byeon, C. Park","doi":"10.1109/PIERS-FALL.2017.8293527","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293527","url":null,"abstract":"This paper presents a D-band six-stage low noise amplifier design in 65nm CMOS process. The single stage amplifier consists of combined cascode topology and common source topology to achieve high gain and save power consumption. For a high-data rate communication system, the wideband characteristic is very important. In order to enhance the 3 dB bandwidth, a two-center frequency technique and inductive feedback technique are used. The odd and even stages are designed to operate at 115 GHz and 125 GHz, respectively. In addition, the amplifier was realized by a conjugate matching technique to achieve low-loss between each stage. The measured results show that the low noise amplifier can provide a gain of 22.4dB with a 3dB bandwidth of 16GHz. The measured OP1dB is −4.5 dBm at 120 GHz. The minimum noise figure was 11.4dB at 117 GHz. The core chip size is 980 × 200 m2 and the power consumption of the proposed low noise amplifier is 61mW at a supply voltage of 1.7V. To the authors' knowledge, this is the best performance (gain −3dB bandwidth product) with low power consumption in 65nm CMOS at D-band frequency.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"5 1","pages":"2339-2343"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88519097","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293364
Rian Gilang Prabowo, Ria Aprilliyani, Basari
The increase of the number of people who die due to tumors is basically able to be prevented by early detection methods. One of the detection methods is by using an imaging technique systems. In this paper, we study microwave imaging system for detection the location of suspicious tumor, due to its advantageous properties such as non-invasive method without any ionization drawback. This paper investigates a tomography method in order to reconstruct an image from the acquired data. To acquire the data, we develop a data acquisition system by using rotational technique without any translational acquisition method. By this rotational technique, scan time will be faster and simpler in comparison with translational and rotational method. The proposed imaging system utilizes two pieces of 3 GHz dipole antennas with a cylindrical phantom that is put in the center as a targeted object. The data acquisition system uses a portable signal generator and spectrum analyzer from Signal Hound™ products, so we do not need vector network analyzer for developing this system. Then, an Algebraic Reconstruction Technique (ART) algorithm is used to reconstruct the desired image from the acquired data. The simulated and measured analyses are conducted with some resolution images from 16 × 16 pixel up to 64 × 64 pixel.
{"title":"Rotation-based image reconstruction by using ART algorithm in microwave imaging","authors":"Rian Gilang Prabowo, Ria Aprilliyani, Basari","doi":"10.1109/PIERS-FALL.2017.8293364","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293364","url":null,"abstract":"The increase of the number of people who die due to tumors is basically able to be prevented by early detection methods. One of the detection methods is by using an imaging technique systems. In this paper, we study microwave imaging system for detection the location of suspicious tumor, due to its advantageous properties such as non-invasive method without any ionization drawback. This paper investigates a tomography method in order to reconstruct an image from the acquired data. To acquire the data, we develop a data acquisition system by using rotational technique without any translational acquisition method. By this rotational technique, scan time will be faster and simpler in comparison with translational and rotational method. The proposed imaging system utilizes two pieces of 3 GHz dipole antennas with a cylindrical phantom that is put in the center as a targeted object. The data acquisition system uses a portable signal generator and spectrum analyzer from Signal Hound™ products, so we do not need vector network analyzer for developing this system. Then, an Algebraic Reconstruction Technique (ART) algorithm is used to reconstruct the desired image from the acquired data. The simulated and measured analyses are conducted with some resolution images from 16 × 16 pixel up to 64 × 64 pixel.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"90 1","pages":"1474-1478"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78259580","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293309
A. Kanno, N. Yamamoto, T. Kawanishi
We propose a bias operation method with high stability using a high extinction-ratio optical modulator. Even in the high extinction-ratio optical modulator, there is instability of the bias fluctuation under a null-point bias operation, in general. We set the bias point at a slope for improvement of tracking performance without significant spurious emissions. When the bias voltage is changed in operation by bias drifts of the modulator, slope-set bias operation can easily provide direction of the voltage change, and finally, can realize quick restoration of the bias condition without unwanted bias changes. Numerical and experimental analyses are discussed in the study with a discussion of nonlinear distortion effect at bias conditions.
{"title":"Modulator bias optimization of a high extinction-ratio optical Mach-Zehnder intensity modulator for linear-cell radar systems","authors":"A. Kanno, N. Yamamoto, T. Kawanishi","doi":"10.1109/PIERS-FALL.2017.8293309","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293309","url":null,"abstract":"We propose a bias operation method with high stability using a high extinction-ratio optical modulator. Even in the high extinction-ratio optical modulator, there is instability of the bias fluctuation under a null-point bias operation, in general. We set the bias point at a slope for improvement of tracking performance without significant spurious emissions. When the bias voltage is changed in operation by bias drifts of the modulator, slope-set bias operation can easily provide direction of the voltage change, and finally, can realize quick restoration of the bias condition without unwanted bias changes. Numerical and experimental analyses are discussed in the study with a discussion of nonlinear distortion effect at bias conditions.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"1 1","pages":"1166-1171"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89421138","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293555
S. Kampeephat, P. Kamphikul, R. Wongsan
This paper presents the technique of the metamaterial on a two-layer wire medium structure for gain improvement of a conventional rectangular horn antenna without its construction enlargement. From our study, we find that the proper metamaterial structure is capable to enhance the gain of the antenna as the additional resonant circuit, exhibit bandgap characteristics at the operating frequency, installed in front of the antenna. This is due to the proper metamaterial exhibits frequency bandpass and bandstop that can block the surface wave excitation in the operating frequency range of antennas. The gain enhancement synthesis method for the proper metamaterial, which is to transfer the electromagnetic fields from aperture of a horn radiated simultaneously through this metamaterial, so that the phases of electromagnetic wave transmission are equal resulting in ultimate resonance The proper metamaterial that is presented by using a two-layer wire medium structure, the 3D volumetric structure. The proposed technique has the advantages of low profile, low cost, and light weight. The antenna characteristics such as reflected power (S11), radiation patterns, and gain are simulated by using the simulation software. From our simulation results, we note that the S11 of this proposed antenna (at −10dB) covered 8–12 GHz, which was wide enough and could be well suitable for application for X-band and I-band following the IEEE and the ITU standards, respectively. The gain at the operating frequency of 10 GHz is 24 dBi, which higher than the gain of a basic rectangular horn antenna around 6dBi with adding only one appropriated metamaterials on a two-layer wire medium structure.
{"title":"Gain improvement for conventional rectangular horn antenna with additional two-layer wire medium structure","authors":"S. Kampeephat, P. Kamphikul, R. Wongsan","doi":"10.1109/PIERS-FALL.2017.8293555","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293555","url":null,"abstract":"This paper presents the technique of the metamaterial on a two-layer wire medium structure for gain improvement of a conventional rectangular horn antenna without its construction enlargement. From our study, we find that the proper metamaterial structure is capable to enhance the gain of the antenna as the additional resonant circuit, exhibit bandgap characteristics at the operating frequency, installed in front of the antenna. This is due to the proper metamaterial exhibits frequency bandpass and bandstop that can block the surface wave excitation in the operating frequency range of antennas. The gain enhancement synthesis method for the proper metamaterial, which is to transfer the electromagnetic fields from aperture of a horn radiated simultaneously through this metamaterial, so that the phases of electromagnetic wave transmission are equal resulting in ultimate resonance The proper metamaterial that is presented by using a two-layer wire medium structure, the 3D volumetric structure. The proposed technique has the advantages of low profile, low cost, and light weight. The antenna characteristics such as reflected power (S11), radiation patterns, and gain are simulated by using the simulation software. From our simulation results, we note that the S11 of this proposed antenna (at −10dB) covered 8–12 GHz, which was wide enough and could be well suitable for application for X-band and I-band following the IEEE and the ITU standards, respectively. The gain at the operating frequency of 10 GHz is 24 dBi, which higher than the gain of a basic rectangular horn antenna around 6dBi with adding only one appropriated metamaterials on a two-layer wire medium structure.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"66 1","pages":"2493-2497"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82394027","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293586
M. Bautista, E. Dutkiewicz, Yang Yang
Design of a miniaturized resonator and its application for dual-band bandpass filter design for millimeter-wave application is presented in this paper. Both the resonator and filter are implemented in a standard 0.13-μm (Bi)-CMOS technology. The performance is extensively verified using an EM simulator from NI-AWR. Using the presented resonator structure, two transmission zeros can be generated and effectively controlled. By feeding the resonator using a capacitive coupling technique, a dual-band bandpass filter that operated at 40 GHz with insertion loss of − 0.7dB and at 71 GHz with insertion loss of − 1.5dB, respectively. The proposed design achieves a reduced layout size of 302 μm × 131 μm.
{"title":"Design of a compact self-coupled resonator and dual-band bandpass filter in 0.13-μm CMOS technology for millimetre-wave application","authors":"M. Bautista, E. Dutkiewicz, Yang Yang","doi":"10.1109/PIERS-FALL.2017.8293586","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293586","url":null,"abstract":"Design of a miniaturized resonator and its application for dual-band bandpass filter design for millimeter-wave application is presented in this paper. Both the resonator and filter are implemented in a standard 0.13-μm (Bi)-CMOS technology. The performance is extensively verified using an EM simulator from NI-AWR. Using the presented resonator structure, two transmission zeros can be generated and effectively controlled. By feeding the resonator using a capacitive coupling technique, a dual-band bandpass filter that operated at 40 GHz with insertion loss of − 0.7dB and at 71 GHz with insertion loss of − 1.5dB, respectively. The proposed design achieves a reduced layout size of 302 μm × 131 μm.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"7 1","pages":"2653-2658"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82617666","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293340
Y. Prabowo, F. Zulkifli
X-band Radar system that has been developed at Universitas Indonesia is a monostatic Radar type, this Radar is using a single antenna for transmitter and receiver. The advantage of this system is cheaper production costs because it only requires one antenna. However one disadvantage of this system is the possibility of the incoming signal which interfere with the signal received by the antenna. To overcome this, we need a device system which has high isolation to suppress interference of electromagnetic waves generated by the transmitter and receiver. Isolation required to suppress interference for a Radar system is ≤ −60 dB and insertion loss ≤ −3dB. In this research, a design of high isolation system is proposed for the integration of lange coupler design with circulator to get high isolation and better insertion loss. The design of the lange coupler and the high isolation systems were simulated using Advanced Design System (ADS) software. The material used for the coupler is Taconic TLY-5 C1, while the circulator used is a commercial circulator. From the simulation results of the lange coupler, the isolation value at the center frequency 9.4 GHz is −69.63 dB and the insertion loss is −0.03 dB. While the isolation results of high isolation system, obtained the value at the center frequency 9.4 GHz is −72.89 dB and the insertion loss is −0.03 dB. The high isolation system can give higher isolation, therefore this design can be applicable for for monostatic X-band Radar system.
{"title":"Design of high isolation system for monostatic X-band radar","authors":"Y. Prabowo, F. Zulkifli","doi":"10.1109/PIERS-FALL.2017.8293340","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293340","url":null,"abstract":"X-band Radar system that has been developed at Universitas Indonesia is a monostatic Radar type, this Radar is using a single antenna for transmitter and receiver. The advantage of this system is cheaper production costs because it only requires one antenna. However one disadvantage of this system is the possibility of the incoming signal which interfere with the signal received by the antenna. To overcome this, we need a device system which has high isolation to suppress interference of electromagnetic waves generated by the transmitter and receiver. Isolation required to suppress interference for a Radar system is ≤ −60 dB and insertion loss ≤ −3dB. In this research, a design of high isolation system is proposed for the integration of lange coupler design with circulator to get high isolation and better insertion loss. The design of the lange coupler and the high isolation systems were simulated using Advanced Design System (ADS) software. The material used for the coupler is Taconic TLY-5 C1, while the circulator used is a commercial circulator. From the simulation results of the lange coupler, the isolation value at the center frequency 9.4 GHz is −69.63 dB and the insertion loss is −0.03 dB. While the isolation results of high isolation system, obtained the value at the center frequency 9.4 GHz is −72.89 dB and the insertion loss is −0.03 dB. The high isolation system can give higher isolation, therefore this design can be applicable for for monostatic X-band Radar system.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"31 1","pages":"1351-1353"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80798648","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293213
Borwen You, Ja-Yu Lu, T. Hattori
A metal rod array (MRA) is experimentally demonstrated as a miniaturized terahertz (THz) waveguide with an extended optical path length and successfully incorporated into microfluidics for liquid molecule sensing. The THz waves guided along the MRA is operated by the transverse-electric (TE) polarization and the resonance transmission within the structural slits is approved in the study. Three layers of MRA support the THz waves to sufficiently overlap the fluid molecules embedded among the rods and strongly enhance the phase change by approximately one order of magnitude. The presentation shows the detection limit of a liquid analyte is less than 0.1 mmol, corresponding to 2.7 μmol/mm2.
{"title":"Terahertz integrated waveguide sensor based on a metal rod array for phase sensitive fluid detection","authors":"Borwen You, Ja-Yu Lu, T. Hattori","doi":"10.1109/PIERS-FALL.2017.8293213","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293213","url":null,"abstract":"A metal rod array (MRA) is experimentally demonstrated as a miniaturized terahertz (THz) waveguide with an extended optical path length and successfully incorporated into microfluidics for liquid molecule sensing. The THz waves guided along the MRA is operated by the transverse-electric (TE) polarization and the resonance transmission within the structural slits is approved in the study. Three layers of MRA support the THz waves to sufficiently overlap the fluid molecules embedded among the rods and strongly enhance the phase change by approximately one order of magnitude. The presentation shows the detection limit of a liquid analyte is less than 0.1 mmol, corresponding to 2.7 μmol/mm2.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"32 1","pages":"630-637"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87240456","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 : 2017-11-20DOI: 10.1109/PIERS-FALL.2017.8293403
Ria Aprilliyani, Rian Gilang Prabowo, Basari
Human cells normally grow, divide and replace into new cells every single minute. Nowadays, improper daily lifestyle leads to cell growth and divide faster than cell replacement, leading to tumor development in the body. The early detection system is currently extensively studied to diagnose the condition of human body faster. We are then focusing on the development of a non-invasive and non-intrusive tomographic imaging system. Microwave imaging is a good candidate for tomography technology to early detect the tumor, due to its advantages compared to other tomography technologies such as low health risk (non-ionization), low cost in implementation and operation, and ease of use. In this paper, we simulate an imaging system by using a simple numerical phantom, in which the phantom dielectric constant is divided into a normal and an abnormal tissue. Dipole antennas are used for transmitting and receiving microwaves signals at 3 GHz. In this case, a translational and rotational method is applied for data acquisition system. The scattering S21 parameter at the receiving antenna is then used as the acquired data for reconstructing an image. In the previous work, we have developed an algebraic reconstruction technique (ART) algorithm that was used for reconstructing an image. As a simplest iterative technique, the image is not stable. Hence, we are now developing a simultaneous algebraic reconstruction technique (SART) algorithm to improve the image quality. SART is supposed to be agile to noise, allowing to having a smoother reconstruction image compared with the ART. This paper will focus on qualitatively and quantitatively analyzing SART algorithm in comparison with the ART. A two-layer-cylindrical phantom model is used for validating the imaging system by CST Microwave Studio™ EM simulator. The outer phantom is set by 53.53 of relative permittivity with the diameter of 14 cm, representing a normal tissue and the inner layer phantom's permittivity is 78 with the diameter of 6 cm, representing benign or malignant tissue. The reconstructed image shows that the SART image is smoother than the ART qualitatively. We also discuss quantitatively about the peak signal-to-noise ratio (PSNR), mean squared error (MSE), normalized cross-correlation (NCC), structural content (SC), maximum difference (MD), and normalized absolute error (NAE).
{"title":"Comparison analysis between SART and ART algorithm for microwave imaging","authors":"Ria Aprilliyani, Rian Gilang Prabowo, Basari","doi":"10.1109/PIERS-FALL.2017.8293403","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293403","url":null,"abstract":"Human cells normally grow, divide and replace into new cells every single minute. Nowadays, improper daily lifestyle leads to cell growth and divide faster than cell replacement, leading to tumor development in the body. The early detection system is currently extensively studied to diagnose the condition of human body faster. We are then focusing on the development of a non-invasive and non-intrusive tomographic imaging system. Microwave imaging is a good candidate for tomography technology to early detect the tumor, due to its advantages compared to other tomography technologies such as low health risk (non-ionization), low cost in implementation and operation, and ease of use. In this paper, we simulate an imaging system by using a simple numerical phantom, in which the phantom dielectric constant is divided into a normal and an abnormal tissue. Dipole antennas are used for transmitting and receiving microwaves signals at 3 GHz. In this case, a translational and rotational method is applied for data acquisition system. The scattering S21 parameter at the receiving antenna is then used as the acquired data for reconstructing an image. In the previous work, we have developed an algebraic reconstruction technique (ART) algorithm that was used for reconstructing an image. As a simplest iterative technique, the image is not stable. Hence, we are now developing a simultaneous algebraic reconstruction technique (SART) algorithm to improve the image quality. SART is supposed to be agile to noise, allowing to having a smoother reconstruction image compared with the ART. This paper will focus on qualitatively and quantitatively analyzing SART algorithm in comparison with the ART. A two-layer-cylindrical phantom model is used for validating the imaging system by CST Microwave Studio™ EM simulator. The outer phantom is set by 53.53 of relative permittivity with the diameter of 14 cm, representing a normal tissue and the inner layer phantom's permittivity is 78 with the diameter of 6 cm, representing benign or malignant tissue. The reconstructed image shows that the SART image is smoother than the ART qualitatively. We also discuss quantitatively about the peak signal-to-noise ratio (PSNR), mean squared error (MSE), normalized cross-correlation (NCC), structural content (SC), maximum difference (MD), and normalized absolute error (NAE).","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"48 1","pages":"1674-1678"},"PeriodicalIF":0.0,"publicationDate":"2017-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86049721","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：