Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130321
O. Tabakoglu, N. Topaloglu, M. Gulsoy
980-nm laser skin welding studies have been performed since 2005 by our group and promising results were obtained. As a continuation of that study, in this current research, it was aimed to compare 2 different application methods by histological and mechanical tests. 1-cm long, 6 incisions were welded with 980-nm diode laser by two different applications: high power (6W-400ms) and low power (0.5W–5s). Throughout 21-day healing period, incision were removed from dorsal skin of Wistar rats under anesthesia on control days (1st, 4th, 7th, 14th and 21st) for histology and mechanical tests. Closure index, thermally altered areas, epidermal thickness and granulation areas of H&E stained samples were calculated. Breaking point of incisions during mechanical tensile test that has 5 mm / min crosshead speed was noted. In this study, effects of high (6W–400ms) and low power (0.5W–5s) applications of same energy level (2.5J) 980-nm diode laser irradiation on skin tissue was shown.
本课程组自2005年开始进行980纳米激光蒙皮焊接的研究，取得了可喜的成果。作为该研究的延续，本研究旨在通过组织学和力学试验比较两种不同的应用方法。采用高功率(6W-400ms)和低功率(0.5W-5s)两种不同的应用程序焊接980 nm二极管激光器，长1 cm, 6个切口。在21天的愈合期内，于对照组(第1、4、7、14、21天)麻醉下从Wistar大鼠背部皮肤上切除切口，进行组织学和力学试验。计算H&E染色样品的闭合指数、热改变面积、表皮厚度和肉芽面积。在机械拉伸试验中，记录了5毫米/分钟十字速度下切口的断裂点。本研究展示了相同能级(2.5J) 980 nm二极管激光高功率(6W-400ms)和低功率(0.5W-5s)照射对皮肤组织的影响。
{"title":"Investigation of different modalities of laser delivery for skin welding","authors":"O. Tabakoglu, N. Topaloglu, M. Gulsoy","doi":"10.1109/BIYOMUT.2009.5130321","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130321","url":null,"abstract":"980-nm laser skin welding studies have been performed since 2005 by our group and promising results were obtained. As a continuation of that study, in this current research, it was aimed to compare 2 different application methods by histological and mechanical tests. 1-cm long, 6 incisions were welded with 980-nm diode laser by two different applications: high power (6W-400ms) and low power (0.5W–5s). Throughout 21-day healing period, incision were removed from dorsal skin of Wistar rats under anesthesia on control days (1st, 4th, 7th, 14th and 21st) for histology and mechanical tests. Closure index, thermally altered areas, epidermal thickness and granulation areas of H&E stained samples were calculated. Breaking point of incisions during mechanical tensile test that has 5 mm / min crosshead speed was noted. In this study, effects of high (6W–400ms) and low power (0.5W–5s) applications of same energy level (2.5J) 980-nm diode laser irradiation on skin tissue was shown.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"357 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115939444","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130292
E. Değirmenci, M. Eyuboglu
Current is applied to the object to be imaged and trajectory of this current inside the object is determined with the help of Magnetic Resonance Imaging (MRI) techniques. Reconstruction of conductivity distribution using this information is called Magnetic Resonance - Electrical Impedance Tomography (MREIT) technique in literature. In this study, a novel anisotropic conductivity reconstruction algorithm for MREIT is proposed. The technique is evaluated on simulated data and obtained results are given.
{"title":"Anisotropic conductivity imaging with MREIT using J-substitution algorithm","authors":"E. Değirmenci, M. Eyuboglu","doi":"10.1109/BIYOMUT.2009.5130292","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130292","url":null,"abstract":"Current is applied to the object to be imaged and trajectory of this current inside the object is determined with the help of Magnetic Resonance Imaging (MRI) techniques. Reconstruction of conductivity distribution using this information is called Magnetic Resonance - Electrical Impedance Tomography (MREIT) technique in literature. In this study, a novel anisotropic conductivity reconstruction algorithm for MREIT is proposed. The technique is evaluated on simulated data and obtained results are given.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"586 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115856089","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130380
A. Demir, Gozde Unal, K. Karaman
Registration of multiple medical images is required for analysis of both pathological and normal anatomical human body structures. In this study, we defined and automatically detected some anatomical landmarks which are considered to be unaffected from brain deformation such as symmetry axis of brain, nose tips, eye ball centers, and location of center of masses of certain slices. Registration is performed using the physical coordinates of automatically detected landmarks. Registration mapping is assumed to be an affine mapping and transformation matrix is formed using a least squares solution. Registered image is obtained using the estimated transformation matrix and trilinear interpolation. Algorithm performance is demonstrated on both MR image volumes deformed synthetically with a known transformation matrix for validation and baseline and follow-up MRI volumes with unknown transformations.
{"title":"Automatic registration of follow-up brain MRI scans","authors":"A. Demir, Gozde Unal, K. Karaman","doi":"10.1109/BIYOMUT.2009.5130380","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130380","url":null,"abstract":"Registration of multiple medical images is required for analysis of both pathological and normal anatomical human body structures. In this study, we defined and automatically detected some anatomical landmarks which are considered to be unaffected from brain deformation such as symmetry axis of brain, nose tips, eye ball centers, and location of center of masses of certain slices. Registration is performed using the physical coordinates of automatically detected landmarks. Registration mapping is assumed to be an affine mapping and transformation matrix is formed using a least squares solution. Registered image is obtained using the estimated transformation matrix and trilinear interpolation. Algorithm performance is demonstrated on both MR image volumes deformed synthetically with a known transformation matrix for validation and baseline and follow-up MRI volumes with unknown transformations.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134196161","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130277
D. D. Demirgunes, O. Eroğul, T. Akcam, Z. Telatar
Snore is a problem, which can be seen in many people and has consequences from distrupting the individual's harmony with environment up to divorce as a familial problem. Snoring patients are analysed in two groups as Simple Snorers and Snorers with Obstructive Sleep Apnea Syndrom (OSAS). Obstructive sleep apnea syndrome (OSAS) is a disease causing serious problems in patients by cessation of upper airway during the sleep. Diagnosis of OSAS is based on the analysis of data recorded from patients in the sleep laboratory during one night by using polisomnograph systems which are defined as gold standard for this subject. Although, snoring is the most definite and early syndrome of OSAS, it might not be sufficient for a clinical diagnosis. In this study, the analysis of respiration (nasal flow), oxigene saturation and acquistic signals that are collected via Biopac Data Acquistition System is performed to distinguish Simple Snorers and Snorers with OSAS. Developed system is considered as a decision support system for physicians by distinguishing which of the patients having the snoring problem require to be taken polisomnograph records in sleep laboratory.
{"title":"Analysis of respiration, oxygen saturation and acoustic signals of snoring patients","authors":"D. D. Demirgunes, O. Eroğul, T. Akcam, Z. Telatar","doi":"10.1109/BIYOMUT.2009.5130277","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130277","url":null,"abstract":"Snore is a problem, which can be seen in many people and has consequences from distrupting the individual's harmony with environment up to divorce as a familial problem. Snoring patients are analysed in two groups as Simple Snorers and Snorers with Obstructive Sleep Apnea Syndrom (OSAS). Obstructive sleep apnea syndrome (OSAS) is a disease causing serious problems in patients by cessation of upper airway during the sleep. Diagnosis of OSAS is based on the analysis of data recorded from patients in the sleep laboratory during one night by using polisomnograph systems which are defined as gold standard for this subject. Although, snoring is the most definite and early syndrome of OSAS, it might not be sufficient for a clinical diagnosis. In this study, the analysis of respiration (nasal flow), oxigene saturation and acquistic signals that are collected via Biopac Data Acquistition System is performed to distinguish Simple Snorers and Snorers with OSAS. Developed system is considered as a decision support system for physicians by distinguishing which of the patients having the snoring problem require to be taken polisomnograph records in sleep laboratory.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"23 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131894208","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130360
C. B. Top, N. G. Gencer
A 3-D Frequency Domain Finite Differences (FDFD) code is developed for electromagnetic simulations of low frequency contactless electrical conductivity imaging. Simulations on discrimination of malign breast tumor are conducted. Required sensitivity of the differential coil system - for detecting a volume of 216mm3 tumor which is located at 1 cm under the skin- are investigated for different frequencies
{"title":"Contactless electrical conductivity imaging simulations using FDFD method","authors":"C. B. Top, N. G. Gencer","doi":"10.1109/BIYOMUT.2009.5130360","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130360","url":null,"abstract":"A 3-D Frequency Domain Finite Differences (FDFD) code is developed for electromagnetic simulations of low frequency contactless electrical conductivity imaging. Simulations on discrimination of malign breast tumor are conducted. Required sensitivity of the differential coil system - for detecting a volume of 216mm3 tumor which is located at 1 cm under the skin- are investigated for different frequencies","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"69 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130769964","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130287
Y. Isler, M. Kuntalp
In this study, it is investigated whether Poincare map measures can be used in discriminating the patients with congestive heart failure (CHF) from normal subjects and determining the type of CHF as diastolic and systolic. Poincare map measures are calculated from ECG data that is freely available over the Internet for CHF patients and normal subjects and statistically compared using Student-t test. Similar measures are also calculated from ECG data obtained from clinics for discriminating diastolic and systolic CHF patients and statistically compared. As a result, Poincare map measures of SD1, SD2, and SD1/SD2 are found to be statistically significant to discriminate patients with CHF from normals whereas only the SD1/SD2 measure is found to be statistically significant for discriminating diastolic CHF patients from systolic ones.
{"title":"Diagnosis of congestive heart failure patients using Poincare measures derived from ECG signals","authors":"Y. Isler, M. Kuntalp","doi":"10.1109/BIYOMUT.2009.5130287","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130287","url":null,"abstract":"In this study, it is investigated whether Poincare map measures can be used in discriminating the patients with congestive heart failure (CHF) from normal subjects and determining the type of CHF as diastolic and systolic. Poincare map measures are calculated from ECG data that is freely available over the Internet for CHF patients and normal subjects and statistically compared using Student-t test. Similar measures are also calculated from ECG data obtained from clinics for discriminating diastolic and systolic CHF patients and statistically compared. As a result, Poincare map measures of SD1, SD2, and SD1/SD2 are found to be statistically significant to discriminate patients with CHF from normals whereas only the SD1/SD2 measure is found to be statistically significant for discriminating diastolic CHF patients from systolic ones.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131696273","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130338
Serdar Yilmaz, O. Toker, N. Arslan
Cardiovascular diseases are important disease to affecting our world recently. Numerical and experimental simulations are rapidly increasing in this research area. Blood Volume Pulse uses frequently to diagnose and treatment of this kind of disease. Data was obtained from modeling of blood vessel and blood flow in vitro experimental system, supports for instruct to direction diagnose and treatment of disease. Because of that femoral artery blood volume signal modeling was chosen as goal, has important place in cardiovascular area. Suitable for this purpose centrifugal pump, pump driver card, data acquisition card, flow meter and other equipments were established for close loop control mechanism in our university's laboratory. Results of obtained indicate that is available model of the femoral artery blood flow taken data from the real patients. There is the motivation result to improve new approach diagnosed and treatment ways of different blood vein and blood volume pulse signals modeling.
{"title":"Femoral artery's Blood Volume Pulse signal modelling","authors":"Serdar Yilmaz, O. Toker, N. Arslan","doi":"10.1109/BIYOMUT.2009.5130338","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130338","url":null,"abstract":"Cardiovascular diseases are important disease to affecting our world recently. Numerical and experimental simulations are rapidly increasing in this research area. Blood Volume Pulse uses frequently to diagnose and treatment of this kind of disease. Data was obtained from modeling of blood vessel and blood flow in vitro experimental system, supports for instruct to direction diagnose and treatment of disease. Because of that femoral artery blood volume signal modeling was chosen as goal, has important place in cardiovascular area. Suitable for this purpose centrifugal pump, pump driver card, data acquisition card, flow meter and other equipments were established for close loop control mechanism in our university's laboratory. Results of obtained indicate that is available model of the femoral artery blood flow taken data from the real patients. There is the motivation result to improve new approach diagnosed and treatment ways of different blood vein and blood volume pulse signals modeling.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115362915","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130309
E. Uzunhisarcikli, F. Latifoğlu, T. Koza, M. Kaya
In this study, Grey relational analysis technique proposed by J.L. Deng has been applied to spectrogram images of clinical mitral valve Doppler signals. A threshold level has been determined to plot maximum frequency envelope from denoised sonogram image using this technique. It is seen that, signal to noise ratio has been improved through Grey relational analysis technique. A software has been realized to support Doppler ultrasound device to diagnose vascular disease. This system has many advanteges that are reducing the computation time, ergonomic, cheapness.
{"title":"Doppler ultrasound signal denoising based on Grey relational analysis technique","authors":"E. Uzunhisarcikli, F. Latifoğlu, T. Koza, M. Kaya","doi":"10.1109/BIYOMUT.2009.5130309","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130309","url":null,"abstract":"In this study, Grey relational analysis technique proposed by J.L. Deng has been applied to spectrogram images of clinical mitral valve Doppler signals. A threshold level has been determined to plot maximum frequency envelope from denoised sonogram image using this technique. It is seen that, signal to noise ratio has been improved through Grey relational analysis technique. A software has been realized to support Doppler ultrasound device to diagnose vascular disease. This system has many advanteges that are reducing the computation time, ergonomic, cheapness.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127524924","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130361
M. Ipekoğlu, S. Altıntaş
In this study, nanosized calcium deficient hydroxyapatite (KEHA) was synthesized using microwave irradiation. The synthesized powder was compared with a sample synthesized without using microwave with respect to the observed phases, particle size and powder morphology based on the XRD, particle size analysis and SEM observations. Studies showed that application of microwave has positive effects on the crystallization of the produced powders.
{"title":"Synthesis of Nanosized Calcium Deficient Hydroxyapatite by Microwave","authors":"M. Ipekoğlu, S. Altıntaş","doi":"10.1109/BIYOMUT.2009.5130361","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130361","url":null,"abstract":"In this study, nanosized calcium deficient hydroxyapatite (KEHA) was synthesized using microwave irradiation. The synthesized powder was compared with a sample synthesized without using microwave with respect to the observed phases, particle size and powder morphology based on the XRD, particle size analysis and SEM observations. Studies showed that application of microwave has positive effects on the crystallization of the produced powders.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131946713","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 : 2009-05-20DOI: 10.1109/LEOS.2009.5343270
S. B. Erdoğan, Canan Bilgin, Beyza Turan, A. Akın
Video game playing is an attractive form of entertainment among school-age children. Although this activity has many adverse effects on child development, there have been only a few studies examining the biological effects of video games on brain activity. The aims of this study were i) to investigate effects of video game playing on attentional capacity and visual skills ii) to relate training induced alterations in performance with regional cerebral oxygenation levels obtained by functional near infrared spectroscopy (fNIRS). 24 high school students (12 video game players and 12 non-video game players) participated in the study. Subjects were asked to perform a task-switching experiment. Cerebral oxygenation level in the prefrontal cortex was measured with a near infrared spectroscopy device. Video game players had shorter reaction times (p≪0.02) to presented stimuli and lower error rates (p≪0.04) when compared to non-video game players. As the task became more difficult; they were able to sustain better performance with more profound increase in prefrontal oxyenation (p≪0.008). The results imply that video game playing alters visual skills and hand-eye coordination. Higher prefrontal oxygenation observed in video game players suggests that limited vascular resources in their brain might be transferred towards areas involved in executive function.
{"title":"Investigation of the effect of playing video games on visual attention and brain hemodynamics with functional near infrared spectroscopy","authors":"S. B. Erdoğan, Canan Bilgin, Beyza Turan, A. Akın","doi":"10.1109/LEOS.2009.5343270","DOIUrl":"https://doi.org/10.1109/LEOS.2009.5343270","url":null,"abstract":"Video game playing is an attractive form of entertainment among school-age children. Although this activity has many adverse effects on child development, there have been only a few studies examining the biological effects of video games on brain activity. The aims of this study were i) to investigate effects of video game playing on attentional capacity and visual skills ii) to relate training induced alterations in performance with regional cerebral oxygenation levels obtained by functional near infrared spectroscopy (fNIRS). 24 high school students (12 video game players and 12 non-video game players) participated in the study. Subjects were asked to perform a task-switching experiment. Cerebral oxygenation level in the prefrontal cortex was measured with a near infrared spectroscopy device. Video game players had shorter reaction times (p≪0.02) to presented stimuli and lower error rates (p≪0.04) when compared to non-video game players. As the task became more difficult; they were able to sustain better performance with more profound increase in prefrontal oxyenation (p≪0.008). The results imply that video game playing alters visual skills and hand-eye coordination. Higher prefrontal oxygenation observed in video game players suggests that limited vascular resources in their brain might be transferred towards areas involved in executive function.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123015361","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：