• Title/Summary/Keyword: Recording Tool

Search Result 135, Processing Time 0.029 seconds

A Welding Defect Inspection using an Ultrasound Excited Thermography (초음파 서모그라피를 이용한 용접 결함 검사)

  • Jo Jae-Wan;Jeong Jin-Man;Choi Yeong-Su;Jeong Seung-Ho;Jeong Hyeon-Gyu
    • Proceedings of the KWS Conference
    • /
    • 2006.05a
    • /
    • pp.148-150
    • /
    • 2006
  • In this paper, the applicability of an UET(ultrasound excited thermography) for a defect detection of the welded receptacle is described. An UET(ultrasound excited thermography) is a defect-selective and fast imaging tool for damage detection. A high power ultrasound-excited vibration energy with pulse durations of 280ms is injected into the outer surface of the welded receptacle made of Al material. An ultrasound vibration energy sent into the welded receptacle propagate inside the sample until they are converted into the heat in the vicinity of the defect. The injection of the ultrasound excited vibration energy results in heat generation so that the defect is turned into a local thermal wave transmitter. Its local heat emission is monitored by the thermal infrared camera. And they are processed by the image recording system. Measurement was performed on aluminum receptacle welded by using Nd:YAG laser. The observed thermal image revealed two area of defects along the welded seam.

  • PDF

Development of Holographic Particle Velocimetry System and Its Application to Spray Droplets (홀로그래피 입자속도 측정시스템의 개발과 분무 액적에의 적용)

  • Choo, Y.J.;Kang, B.S.
    • Journal of ILASS-Korea
    • /
    • v.10 no.3
    • /
    • pp.17-28
    • /
    • 2005
  • The Holographic Particle Velocimetry system can be a promising optical tool for the measurements of three dimensional particle velocities. In this study, diffused illumination holographic system to measure the sizes and 3D velocities of moving particles based on automatic image processing was developed. First of all basic optical systems for pulse laser recording, continuous laser reconstruction, and image acquisition, were constructed. To determine the position of particles in the optical axis, new three auto-focusing parameters(AEP), namely, Correlation Coefficient, Sharpness Index, and Depth Intensity were introduced and verified. The developed system was applied to spray droplets to validate the capability of the system. Three dimensional positions of particles viewed from two sides were decided using AFP and then 3D velocities of Particles were extracted by particle tracking algorithm. Comparison of measurement results of sizes and 3D velocities of particles with those obtained by laser instrument, PDPA, showed good consistency of the developed holographic system.

  • PDF

The Need for Level-based Criteria in the Assessment of Oral Proficiency

  • Kim, Hae-Young
    • English Language & Literature Teaching
    • /
    • v.15 no.2
    • /
    • pp.169-184
    • /
    • 2009
  • The purpose of this study is to identify the most important factor(s) that contribute(s) to the overall oral proficiency and to examine whether the factor(s) play(s) a different role depending on the proficiency level of learners. Learners were divided into novice group and advanced group and were asked to produce an oral recording of a story based on a comic strip. The recordings were transcribed and graded by three raters. According to the results, the raters attained high inter-rater reliability when assessing advanced learners. However, the reliability level became considerably lower in the assessment of novice learners. The best predictor of oral proficiency among novice learners was sociolinguistic competence and fluency, while grammatical competence and fluency were the strongest predictors for advanced learners. The results suggest the need for a separate assessment tool for different proficiency levels and the need for a different focus in the classroom depending on the learners' proficiency level.

  • PDF

Investigation of Dose Distribution in Mixed Neutron-Gamma Field of Boron Neutron Capture Therapy using N-Isopropylacrylamide Gel

  • Bavarnegin, Elham;Khalafi, Hossein;Sadremomtaz, Alireza;Kasesaz, Yaser;Khajeali, Azim
    • Nuclear Engineering and Technology
    • /
    • v.49 no.1
    • /
    • pp.189-195
    • /
    • 2017
  • Gel dosimeters have unique advantages in comparison with other dosimeters. Until now, these gels have been used in different radiotherapy techniques as a reliable dosimetric tool. Because dose distribution measurement is an important factor for appropriate treatment planning in different radiotherapy techniques, in this study, we evaluated the ability of the N-isopropylacrylamide (NIPAM) polymer gel to record the dose distribution resulting from the mixed neutron-gamma field of boron neutron capture therapy (BNCT). In this regard, a head phantom containing NIPAM gel was irradiated using the Tehran Research Reactor BNCT beam line, and then by a magnetic resonance scanner. Eventually, the $R_2$ maps were obtained in different slices of the phantom by analyzing T2-weighted images. The results show that NIPAM gel has a suitable potential for recording three-dimensional dose distribution in mixed neutron-gamma field dosimetry.

Development of An Automated Scanning Laser Doppler Vibrometer For Measurements of In-Plane Structural Vibration (평면 구조 진동 측정을 위한 자동화된 스캐닝 레이저 도플러 진동측정기의 개발 및 연구)

  • 길현권
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1996.10a
    • /
    • pp.422-430
    • /
    • 1996
  • The automated scanning laser Doppler vibrometer (LDV) has been designed, and built to measure in-plane displacements associated with waves propagating on vibrating structures. Use of optical fibers allows the compact design of a laser probe head which can be scanned over the vibrating structures. An algorithm for automated self-alignment of the laser probe is developed. The system is completely automated for scanning over the structures, focusing two laser beams at each data point until the detected vibration signal is stable, and for recording and transferring the data to a system computer. The automated system allows one to get extensive data of the vibration field over the structures. The system is tested by scanning a piezoelectric cylindrical shell and a plate excited by a continuous signal and by a pulse signal, respectively. Results show that the automated scanning LDV system can be a useful tool to measure the in-plane vibration field and to detect the elastic waves propagating on the vibrating structures.

  • PDF

X-Ray Absorption Spectroscopy: A Complementary Tool for Structural and Electronic Characterization of Solids

  • Jean Etourneau
    • Bulletin of the Korean Chemical Society
    • /
    • v.19 no.1
    • /
    • pp.5-21
    • /
    • 1998
  • The purpose of this paper is to show that X-ray absorption spectroscopy (XANES and EXAFS) is a powerful technique for characterizing both crystalline and amorphous solids from structural (local order) and electronic point of view. The principle of this technique is briefly described by showing the main factors which must be considered for recording and fitting the experimental results. Some non-trivial examples have been selected for demonstrating that XAS spectroscopy is the only technique for bringing a definitive answer as for example: the determination of the local distortion of the $NiO_6$ octahedra in the $Li_{1-z}Ni_{1+z}O_2$ layered oxides and the evidence of the presence of copper pairs in the NASICON-type phosphate $CuZr_2 (PO_4)_3$. Are also reported some significant examples for which XAS spectroscopy is decisive with other characterization methods as (i) Raman spectroscopy for glasses (ii) Mossbauer spectroscopy for $LiNi_{1+z-t}Fe_To_2$ oxides (iii) magnetic measurements for Ce-based intermetallic compounds.

Determinants of Financial Literacy and Digital Literacy on Financial Performance in Driving Post-Pandemic Economic Recovery

  • Dura, Justita
    • Journal of Contemporary Eastern Asia
    • /
    • v.21 no.2
    • /
    • pp.47-68
    • /
    • 2022
  • Micro, Small, and Medium Enterprises (East Java, Indonesia) are one of the businesses that drive developing nations' economies with various challenges, particularly in finance and digitalization. The impact of financial literacy and the use of digitalization can affect the recording and reporting of company performance. This is quantitative research, and the population in this research is SMEs in East Java, with 401 SMEs from various businesses for the sample used. This research uses the primary data method of SMEs in East Java with the Structural Equation Model as a data analysis tool. The results showed a significant relationship between financial literacy and financial performance, and digital literacy was based on financial performance. However, digital literacy could not moderate financial literacy with the financial performance of East Java SMEs. Much of the untapped potential in this study was adopted from financial governance and digitalization. It is hoped that the subsequent study will examine other phenomena on the variables used in the post-pandemic.

A Study on Google Classroom as a Tool for the Development of the Learning Model of College English

  • Lee, Jeong-Hwa;Cha, Kyung-Whan
    • International Journal of Contents
    • /
    • v.17 no.2
    • /
    • pp.65-76
    • /
    • 2021
  • The aim of this study was to explore the use of Google Classroom as a learning management system for College English. The study targeted 34 university students. They took part in various activities, such as writing reactions to video lectures, peer-editing essays, and recording video presentations, et cetera. For the study, a t-test was conducted to evaluate the English development of the students. The two essays that each student wrote were used as the data sources. The result (t=-5.854, p=.000) indicated an improvement in their English writing proficiency. In addition, a survey was conducted to gather students' feedback regarding their perceptions towards the course. The study covered five aspects of their experience: Google Classroom, language development, Quizlet, classroom experience, and essay-writing experience. From the results, students indicated a positive response to the program. The use of Google Classroom in an online learning setting accomplishes two things; it helped the students in the development of their English proficiency, and provided activities that students find interesting, which in turn stimulates their self-learning spirit.

A Study on eye-tracking software design and development for e-sports viewing on the web (e 스포츠 웹 시청 연구를 위한 시선 분석도구 설계 및 개발)

  • Ko, Eunji;Choi, SunYoung
    • Journal of Korea Game Society
    • /
    • v.15 no.4
    • /
    • pp.121-132
    • /
    • 2015
  • This study suggests a design for an analytical software program and method for multitasking e-sports viewing through the web using an eye tracking device. To fulfill this task, we designed a Window of Interest (WOI) to measure and record visually on a screen wherever numerous multitasking activities occur. In addition, we developed an OBS (Opensource Broadcaster Software) plug-in that records and streams participant viewing behavior patterns in real time. The purpose of this study is as follows. First, unlike existing tools that limit web interface recording to still images, the developed tool can record dynamically via media such as videos. Second, when several windows are processed on a screen, the tool can accurately record the gaze positions of the participants. Lastly, the tool can enhance the objective validity of the data as it can be implemented in natural situations. Therefore, this study can trace natural viewing patterns and behavior as we do not create artificial experimental environments and stimuli.

Comparative evaluation of the effectiveness of two innovative methods in the management of anxiety in a dental office: a randomized controlled trial

  • Panchal, Jay;Panda, Anup;Trivedi, Krishna;Chari, Deepika;Shah, Rushita;Parmar, Binny
    • Journal of Dental Anesthesia and Pain Medicine
    • /
    • v.22 no.4
    • /
    • pp.295-304
    • /
    • 2022
  • Background: The first dental experience is vital in molding a child's attitude towards dentistry and dental outcomes. The cooperation of a child during dental treatment is essential to render successful and high-quality treatment. Dental anxiety is common in children undergoing dental treatment. The success of pediatric dental treatments and patient comfort depends on controlling the levels of patient anxiety in clinical settings. This study aimed to compare the effectiveness of the recorded maternal voice and virtual cognitive tool (Roogies application) in the management of pediatric dental patients. Methods: The study was carried out with children aged of 4-7 years [n = 80, (40 male and 40 female)], without any past dental history, and were randomly allocated into two groups. After informed consent was obtained, the entire procedure was explained to the parents. Anxiety was assessed pre-, during, and post-treatment by measuring pulse rate, and recording Venham Picture Test (VPT) scores. Group A [n = 40; 20 boys and 20 girls)] was provided with a headphone that played a recorded maternal voice. Group B [n = 40; 20 boys and 20 girls)] was administered the virtual cognitive tool. After conditioning the children, oral prophylaxis was performed for both groups. A comparative evaluation was conducted for each treatment session. Results: The intra-group comparison of VPT scores and heart rate for patients assigned to the recorded maternal voice showed a statistically significant difference in dental anxiety (P-value ≤0.001). Conclusion: This study demonstrated that a reduction in dental anxiety with the help of recorded maternal voice forms an important component of non-pharmacological behavior management. Alternatively, the use of a virtual cognitive tool as an anxiety-reducing technique can also be advocated.