Statistical Based Audio Forensic on Identical Microphones

2016 ◽  
Vol 6 (5) ◽  
pp. 2211 ◽  
Author(s):  
Fajri Kurniawan ◽  
Mohd. Shafry Mohd. Rahim ◽  
Mohammed S. Khalil ◽  
Muhammad Khurram Khan
Keyword(s):  
Statistical Analysis ◽  
Experimental Results ◽  
Digital Audio ◽  
Robust Method ◽  
Sound Recording ◽  
Audio Recording ◽  
Audio Forensics ◽  
The Difference

<p>Microphone forensics has become a challenging field due to the proliferation of recording devices and explosion in video/audio recording. Video or audio recording helps a criminal investigator to analyze the scene and to collect evidences. In this regards, a robust method is required to assure the originality of some recordings. In this paper, we focus on digital audio forensics and study how to identify the microphone model. Defining microphone model will allow the investigators to conclude integrity of some recordings. We perform statistical analysis on the recording that is collected from two microphones of the same model. Experimental results and analysis indicate that the signal of sound recording of identical microphone is not exactly same and the difference is up to 1% - 3%.</p>

scholarly journals Statistical Based Audio Forensic on Identical Microphones

2016 ◽  
Vol 6 (5) ◽  
pp. 2211
Author(s):  
Fajri Kurniawan ◽  
Mohd. Shafry Mohd. Rahim ◽  
Mohammed S. Khalil ◽  
Muhammad Khurram Khan
Keyword(s):  
Statistical Analysis ◽  
Experimental Results ◽  
Digital Audio ◽  
Robust Method ◽  
Sound Recording ◽  
Audio Recording ◽  
Audio Forensics ◽  
The Difference

<p>Microphone forensics has become a challenging field due to the proliferation of recording devices and explosion in video/audio recording. Video or audio recording helps a criminal investigator to analyze the scene and to collect evidences. In this regards, a robust method is required to assure the originality of some recordings. In this paper, we focus on digital audio forensics and study how to identify the microphone model. Defining microphone model will allow the investigators to conclude integrity of some recordings. We perform statistical analysis on the recording that is collected from two microphones of the same model. Experimental results and analysis indicate that the signal of sound recording of identical microphone is not exactly same and the difference is up to 1% - 3%.</p>

Comparative Measurement on Transmittance of Four Systems of Dental All-Ceramic Zirconia Materials

2013 ◽  
Vol 833 ◽  
pp. 185-188
Author(s):  
Bin Deng ◽  
Juan Xu ◽  
Guang Shi ◽  
Li Min Liang ◽  
Yuan Fu Yi ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Experimental Results ◽  
Comparative Measurement ◽  
Anterior Teeth ◽  
Optical Effects ◽  
All Ceramic ◽  
Restorative Materials ◽  
The Difference

This study aims to investigate the difference on transmittance of four systems of dental all-ceramic zirconia materials which are at clinical required thickness,IPS e.max Press used as control.All-ceramic zirconia specimens containing Zenostar,Lava,Cercon and Upcera,are fabricated into discs with 10mm in diameter and 0.5±0.01mm in thickness.The transmittance of disc specimens are measured by using PR2650 spectrophotometer and the measurements are conducted statistical analysis with software SPSS13.Experimental results reveal that the transmittances of four systems of zirconia materials are significantly different.Their transmittances decrease in sequence of IPS e.max Press ,Zenostar,Lava,Cercon and Upcera zirconia.Zenostar and Lava Zirconia,which have good optical effects,possess ideal restorative materials for anterior teeth with higher transmittance.

Comparative Measurement on Translucency of Four Systems of Dental All-Ceramic Zirconia Materials

2013 ◽  
Vol 833 ◽  
pp. 181-184
Author(s):  
Rong Jian Lu ◽  
Cheng Ge ◽  
Li Sun ◽  
Guang Shi ◽  
Cheng Long Wang ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Color Difference ◽  
Experimental Results ◽  
Comparative Measurement ◽  
All Ceramic ◽  
The Difference

This study aims to investigate the difference on relative translucency of four systems of dental all-ceramic zirconia materials which are all at clinical required thickness.All-ceramic zirconia specimens containing Zenostar,Lava,Cercon and Upcera are fabricated into discs with 10mm in diameter and 0.5±0.01mm in thickness.The relative translucency of specimens are measured with color difference meter,and the measurements are conducted statistical analysis with software SPSS13.Experimental results display that their relative translucency are significantly different,which decrease in sequence of Zenostar,Lava,Cercon and Upcera zirconia.Cercon zirconia with certain translucency could be used for relatively opaque posterior tooth.As for discolored teeth,Upcera Zirconia may be advisable.

scholarly journals Anti-Forensics of Double Compressed MP3 Audio

2020 ◽  
Vol 12 (3) ◽  
pp. 45-57
Author(s):  
Biaoli Tao ◽  
Rangding Wang ◽  
Diqun Yan ◽  
Chao Jin
Keyword(s):  
Experimental Results ◽  
Frame Structure ◽  
Detection Methods ◽  
Digital Audio ◽  
Simple Method ◽  
Double Compression ◽  
Audio Forensics ◽  
History Of ◽  
Widespread Availability ◽  
Audio Sample

The widespread availability of audio editing software has made it easy to create acoustically convincing digital audio forgeries. To address this problem, more and more attention has been paid to the field of digital audio forensics. There has been little work, however, in the field of anti-forensics, which seeks to develop a set of techniques designed to fool current forensic methodologies. The compression history of an audio sample can be used to provide evidence of audio forgeries. In this work, we present a simple method for distinguishing the MP3 compression history of an audio sample. We show the proposed anti-forensics method to remove the artifacts of MP3 double compression by destroying the audio frame structure. In addition, effectiveness of the proposed method is verified by three double compression detection methods. The experimental results show that the proposed method can effectively resist detection from three methods.

The Effect of T-Commerce Scarcity Messages and Price Policies on Attitudes and Purchase Intention

2019 ◽  
Vol 118 (1) ◽  
pp. 42-47
Author(s):  
KwangSeok Han
Keyword(s):  
Statistical Analysis ◽  
Purchase Intention ◽  
Time Limit ◽  
Discount Factor ◽  
Limited Time ◽  
Price Discount ◽  
Discount Price ◽  
Strategic Plans ◽  
Factor Design ◽  
The Difference

Background/Objectives: This study investigated differences in the attitude of users according to type of scarcity message and price discount conditions to compose T-commerce sales messages and search for effective strategic plans. Methods/Statistical analysis: This study empirically verifies the difference in promotion attitude and purchase intention between the type of T-Commerce scarcity message (quantity limit message / time limit message) and the price discount policy (price discount / non-discount) message. For this purpose, 2 (scarcity type: limited quantity, limited time) X 2 (with or without price discount: price discount, no price discount) factor design between subjects was used.

scholarly journals Wireless distance measurement by means of ultra-wideband chaotic radio pulses

2019 ◽  
Vol 30 ◽  
pp. 12005
Author(s):  
Elena Efremova ◽  
Alexander Dmitriev ◽  
Lev Kuzmin ◽  
Manvel Petrosyan
Keyword(s):  
Statistical Analysis ◽  
Distance Measurement ◽  
Experimental Results ◽  
Ultra Wideband

A method for wireless distance measurement using ultrawideband chaotic radio pulses based on statistical analysis is proposed. Experimental results are discussed.

Analysis of the breeding records of a herd of pigs

1954 ◽  
Vol 45 (1) ◽  
pp. 19-27 ◽  
Author(s):  
R. Braude ◽  
P. M. Clarke ◽  
K. G. Mitchell
Keyword(s):  
Statistical Analysis ◽  
Large White ◽  
Seasonal Differences ◽  
Significant Difference ◽  
The Mean ◽  
The Difference ◽  
Length Of Gestation

1. A survey and. statistical analysis of the records of litters born in the N.I.R.D. herd of Large White pigs over a period of 16 years are presented.2. The mean length of gestation was 114 days for both gilts and sows.3. The mean numbers of pigs born alive and born dead per litter from gilts, 10·0 and 0·2 respectively, were both significantly smaller than the corresponding figures for sows, 11·8 and O·8. No seasonal differences were found.4. The mean total losses of pigs from birth to weaning at 8 weeks were 29·5% of pigs born alive. The losses in litters from gilts, 23·0%, were significantly smaller than in litters from sows, 31·0%. The losses during the winter months both for gilts, 32·5%, and for sows, 35·9%, were significantly higher than during the summer months, 19·4% and 26·7% for gilts and sows respectively.5. Over 50% of the total losses were due to crushing by the dam, 74·1% of the losses from this cause occurring during the first 48 hr. after birth.6. The mean number of pigs weaned per litter was 8·0. The difference between the number weaned per litter from gilts, 7·7, and per litter from number of pigs was weaned per litter from sows during the summer months, 8·7, than during the winter months, 7·4.7. There was no significant difference between the number of male and of female pigs weaned.8. The mean weight at weaning was 29·9 lb., male pigs, 30·3 lb., being significantly heavier than females, 29·51b. Pigs in litters from gilts, 27·81b., were significantly lighter at weaning than those from sows, 30·0 lb., and for both gilts and sows, pigs reared during the summer months, 29·7 and 31·8 lb. respectively, were significantly heavier than those reared during the winter months, 25·9 and 28·2 lb. respectively.

scholarly journals Characteristics of anteroposterior curvatures of the spine in soccer and futsal players

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Krystyna Chromik ◽  
Anna Burdukiewicz ◽  
Jadwiga Pietraszewska ◽  
Aleksandra Stachoń ◽  
Paweł Wolański ◽  
...  
Keyword(s):  
College Students ◽  
Statistical Analysis ◽  
Injury Prevention ◽  
Analysis Of Variance ◽  
Statistical Significance ◽  
Body Posture ◽  
Soccer Players ◽  
Prevention Training ◽  
The Difference ◽  
Post Hoc

AbstractPurpose. The aim of the study was to determine differences in anteroposterior spine curvatures between futsal players, soccer players, and non-training students. The results may contribute to the development of present-day knowledge of posturometry, and its implementation in training can help reduce the risk of body posture disorders in athletes. Methods. The examined group consisted of 48 athletes and 38 non-training college students. Body posture parameters were measured with the use of Posturometr-S. The normality of distribution was checked with the Shapiro-Wilk test, and the differences between the groups were measured with ANOVA and the Bonferroni post-hoc test. The level of statistical significance was set at p < 0.05. Results. The analysis of angle values revealed the widest and most similar measurements in the group of futsal players and soccer players. The analysis of variance proved statistically significant differences between the soccer players and futsal players (p = 0.003). The difference between the soccer players and non-training students was statistically significant. The highest γ angular value was measured in non-training students, followed by futsal players and soccer players. The statistical analysis revealed significant differences between the non-training students and futsal players, as well as non-training students and soccer players (p < 0.001). Conclusions. A complex assessment of athletes’ body posture is crucial in injury prevention. Training overloads may often lead to disorders of the organ of locomotion and affect the correct body posture in athletes. This, in turn, may result in pains and injuries.

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