Proceedings of the 1998 2nd International Conference Biomedical Engineering Days最新文献

{"title":"Clustering analysis of respiratory crackles","authors":"M. Y. Buruk, Y. Kahya, Bulent Sankur","doi":"10.1109/IBED.1998.710607","DOIUrl":"https://doi.org/10.1109/IBED.1998.710607","url":null,"abstract":"Crackles extracted from lung sounds recorded from pathological subjects were modelled using two different sets of parameters. The first set consisted of conventional parameters used widely by physicians. The second set consisted of Prony frequencies and damping coefficients obtained from the Prony model of order one. The crackles were clustered with no a priori information about the diseases using iterative partitional clustering. Clustering using either models shows that there is a relationship between crackles and lung diseases.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"280 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116072568","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}

{"title":"Suppression of the sensory conflict status using biofeedback information channel","authors":"V. Goussev, I. Orlov, S. Dolgobrodov","doi":"10.1109/IBED.1998.710547","DOIUrl":"https://doi.org/10.1109/IBED.1998.710547","url":null,"abstract":"Proposed is the biofeedback technique to diminish or eliminate the sensory conflict status using the galvanic stimulation of the vestibular pathway. The stabilization task for the human to maintain the body upright position near the local vertical is considered in presence of the visual disbalancing input. An independent inertial gauge rigidly attached to the body was used to estimate the real body sways from the local vertical. The gauge signals being converted to the galvanic stimulation signals of the vestibular pathway formed the biofeedback channel delivering an additional information to the central nervous system (CNS). The corresponding mathematical model and software, based on the quaternion algebra are given to explain and analyze the experimental data. This model explains a number of the experimental phenomena including the new finding that consists of the appearance of the mean body sway value lower then conventional one corresponding to conditions of absence of any disbalancing input as well as the biofeedback.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123884487","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}

{"title":"Line scan CPMG technique for studies of exercised muscle","authors":"H.P. Zengingonul, C. Winalski, R. Mulkern","doi":"10.1109/IBED.1998.710583","DOIUrl":"https://doi.org/10.1109/IBED.1998.710583","url":null,"abstract":"The proton relaxation time, T/sub 2/, of anterior tibialis muscle was studied using a line scan Carr-Purcell-Meiboom-Gill (CPMG) imaging technique both before and after exercise. Decomposition of the signal decay revealed a short and a long component with values in the 16-22 ms, and 65-95 ms range, respectively, after biexponential fitting of the decay curves. A significant decrease in the fraction of the short phase to the overall signal was observed following exercise with little variation of the component relaxation times. Conventional 2D-FT CPMG was also used to investigate the same muscle for comparison purposes. These T/sub 2/ decay curves, however, were only suitable for monoexponential modeling. Exercise induced an increase of 30% in T/sub 2/ values calculated from the ID-FT CPMG data sets. Although the mechanism behind the biexponential T/sub 2/ decay is not fully understood, the line scan CPMG technique has great potential to study muscle physiology with very high temporal resolution determined by the TR period, though volume coverage is limited to a single tissue column. The approach may provide a greater ability to study physiological mechanisms within muscle, including water compartmentation and exchange when compared to conventional 2D-FT imaging sequences.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134095140","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}

{"title":"Otoacoustic emission acquisition using adaptive noise cancellation techniques","authors":"Ozcan Ozdamar, Rafael, Delgado","doi":"10.1109/IBED.1998.710608","DOIUrl":"https://doi.org/10.1109/IBED.1998.710608","url":null,"abstract":"A Distortion Product Otoacoustic Emission (DPOAE) system utilizing multiple microphones and advanced noise cancellation methods is described. This application focuses on noise cancellation techniques used to reduce internal and external noise contamination especially at the frequencies under 1500 Hz. Two additional microphones were used to acquire external and internal noise reference signals from the non-test ear and from the testing environment. Hardware and software was developed and experiments conducted to test the feasibility of using two noise reduction techniques. Adaptive Noise Cancellation (ANC) and Adaptive Wiener Filtering (AWF). Data were acquired in single sweeps and processed off-line with each method. Additional real-time ANC experiments were also conducted. Experimental results demonstrated that the ANC algorithm has the ability to reduce background noise and improve the SNR levels of DPOAE signals by about 5 dB. The AWF algorithm was also found to improve SNR levels between 3 and 9 dB at the lower frequencies depending on the reference microphone combination.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134319731","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}

{"title":"Hydroxyapatite implantation at tooth extraction sites","authors":"F. Oktar, S. Altıntaş","doi":"10.1109/IBED.1998.710600","DOIUrl":"https://doi.org/10.1109/IBED.1998.710600","url":null,"abstract":"In this study 10 patients of various ages were selected for hydroxyapatite augmentation. Teeth, which should be extracted, were unrestorable under normal conditions by any endodontic or prosthetic procedure. For every case X-rays were taken before extraction and after augmentation. Every case was also controlled with X-rays after three months of augmentation and it was seen that hydroxyapatite particulates were safely osseoconducted. It is concluded that hydroxyapatite augmentation is a valuable method to prevent atrophy of alveolar ridges after extractions.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127939882","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}

{"title":"The effect of electromagnetic field with a frequency of 144 MHz on the blood parameters and behavior of rats","authors":"M. A. Korpinar, M. T. Kalkan, A. Morgul, H. Birman, M. Hacibekiroğlu","doi":"10.1109/IBED.1998.710575","DOIUrl":"https://doi.org/10.1109/IBED.1998.710575","url":null,"abstract":"Electromagnetic fields with a frequency of 30-300 MHz are used extensively, particularly in communication. Radio, wireless and TV are performed from these frequencies. The negative effects of RF waves are known since 1970s. From the 1980s on the power intensities of these together with electrical and magnetic components have been standardized by ANSJ 82, INIRC 88 and NRPS 89 (these standards are also valid for the authors' country). The authors aimed to investigated the effects of RF waves, with a frequency and intensity just above the permitted ranges, on blood parameters and behavioral changes of rats. They used 27 Wistar albino rats of both genders: 12 as controls and 15 as the experimental group. They put the animals in specially prepared cages and performed RF irradiation with a frequency of 144 MHz and a power intensity of 12.5 Watt/m/sup 2/ to the experimental group. For the 21 days period the authors measured the food and water consumption of the animals, their body weights, the amounts of urine and faeces, rectal temperatures, and humidity-pressure-temperature values inside the cages. At the end of the experimental period the authors performed elevated plus maze and holeboard tests to the experimental group to assess the alterations in anxiety and behavior. The authors measured erythrocyte, thrombocyte, Hct, Hb, leukocyte values, bleeding and coagulation times and leukocyte formulation in the blood taken from the tip of the tail. They also measured Vanil Mandelik Asit (VMA) which is a metabolic product of adrenaline from daily urine samples collected by metabolism cages. As a result; although the intensity of the EM field in the frequency the authors used was just above the given ranges they couldn't obtain any statistically significant results between all parameters in control and experimental groups. The authors come to 2 significant and evident results in view of these results. They can say that the upper ranges determined have also flexibility (tolerance) and as they consider that these standards are for humans. They can comment that the dimensions of rats are small and thus the frequency is too low to get the resonance effects.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122197419","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}

{"title":"The effect of the 50 Hz frequency sinusoidal magnetic field on the stress-related behavior of rats","authors":"M. T. Kalkan, M.A. Korpinar, S. Seker, H. Birman, M. Hacibekiroğlu","doi":"10.1109/IBED.1998.710574","DOIUrl":"https://doi.org/10.1109/IBED.1998.710574","url":null,"abstract":"The purpose of this study was to investigate the behavioral changes induced by 50 Hz Sinusoidal Magnetic Field (MF). 72 young adult male Wistar albino rats were used in the study. They were separated into two groups: Control group (C) n=36, MF group n=36. C animals were left in the same conditions with the MF group for 21 days but prevented or avoided any exposure to MF. Anxiety and stress related behavioral changes were investigated by elevated plus maze and holeboard systems. Just before being tested in the maze each animal was tested with the holeboard method in order to separate directed exploration behavior and locomotion activity changes from anxiety related behavior. Data was analyzed by unpaired \"t\" test on OXSTAT/PC software. In the holeboard system parameters there were no statistically significant differences between the two groups. The anxiety score, which was the ratio between the percentage of entries into open arms to the total time spent on the open arms in the elevated plus maze system, was used as a parameter to evaluate the anxiety related behavior. The anxiety scores of the groups were: C=0.34/spl plusmn/0.38, MF=0.12/spl plusmn/0.18 and MF group anxiety scores were significantly decreased when compared to C group (p<0.01). This results show that MF (50 Hz and 10 mT), can induce stress related anxious behavior in experimental conditions.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123853854","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}

{"title":"A suture-tissue pullout model in the rat abdominal wall","authors":"Z. Babetty, A. Sumer, S. Altıntaş, S. Erguney","doi":"10.1109/IBED.1998.710602","DOIUrl":"https://doi.org/10.1109/IBED.1998.710602","url":null,"abstract":"The suture pullout through tissue is the major cause of dehiscence. The paper presents a biomechanical model of suture pullout through the rat abdominal wall. It also studies the effect of some factors on the suture pullout force: incision orientation, knot configuration, suture material, gauge size and strain rate. Transverse and vertical incisions were made in the rat abdominal wall. Specimens were cut according to the standard test method for tensile properties of plastics by use of microtensile specimens corresponding to ASTM D 1708-84. The specimens were sutured with interrupted knots of either silk or nylon using two sizes: 2/0 and 4/0. Three different knot configurations were tested. The specimens were mounted on Zwick 1446 Universal tensile machine and the load is applied gradually at 100 mm/min until the tissue tears through the suture knot. Different strain rates were used: 50, 100, 150, 200 mm/min. The evaluation of the results was determined using multi-way ANOVA test with significance level 0.05. The incisional direction, knot configuration, strain rate were important factors in determining the suture pullout force. However, the gauge size did not affect the suture pullout force.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129800571","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}

{"title":"Computation of electric field induced currents on human body standing under a high voltage transmission line by using charge simulation method","authors":"H. Yildirim, O. Kalenderli","doi":"10.1109/IBED.1998.710572","DOIUrl":"https://doi.org/10.1109/IBED.1998.710572","url":null,"abstract":"In this paper, effects of high voltage transmission line electric fields on biological systems especially on a grounded human body standing under a high voltage transmission line are studied. The distribution of electric field and induced currents on a human body standing underneath a high voltage overhead transmission line is computed. The electric field distribution around a three phase 380 kV transmission line is computed by using the Charge Simulation Method. Induced currents on the human body are obtained using the computed electric field values. Computed induced currents are evaluated with respect to safe limits. It is found that these currents are below the dangerous limits.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128049425","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}

{"title":"Estimation of systolic blood pressure from the second heart sounds","authors":"H. Ozcan Gulcur, Y. Bahadirlar","doi":"10.1109/IBED.1998.710553","DOIUrl":"https://doi.org/10.1109/IBED.1998.710553","url":null,"abstract":"The second heart sound signal is modelled using exponentially damping sinusoids and forward linear predictions. Relationships between the parameters of the model and systolic blood pressure in the aortic root are investigated. Damping and amplitude parameters show higher (statistically significant) correlation to the systolic pressure.","PeriodicalId":264581,"journal":{"name":"Proceedings of the 1998 2nd International Conference Biomedical Engineering Days","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121222499","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}