Hasil Pencarian  ::  Simpan CSV :: Kembali

"ABSTRACTTotal auricular reconstruction of microtia with autogenous costal cartilage is one of the most demanding challenges in plastic and reconstructive surgery because of the complex three-dimensional shape of the auricle. An ideal result of the constructed ear depends primarily on the fabricated cartilaginous ear framework. As the cartilage framework used for reconstruction is always insufficient for the fabrication of anatomical structures, especially the tragus and the conchal bowl, individualized framework grafting based on different patient age groups and different degrees of strength and thickness of the rib cartilages have been devised accordingly. For a configuration of the concha that is definitely anatomical, we constructed the conchal bowl element in one of three patterns according to the amount of available cartilages: one block, two-pieces, or a cymba bowl element only. The patients were followed up for more than 1 year. The aesthetic results were scored by evaluating characteristics involving the stability of the crus helicis, the conchal definition, and the smoothness of the helical curve.The ears reconstructed early without a conchal bowl element and ears reconstructed later with the concha bowl element showed a definite crus helicis, deep cymba conchal space, and smooth helical curve. The construction of the conchal bowl element is simple dan not time-consuming procedure. It is suggested that the conchal bowl element must be constructed and attached to the main framework for natural configuration of the reconstructed ear. "

"The technique of measuring the profile of the surface of a three dimensional object shape is by using structured-light technique, where the object to be measured is placed on flat surface. The source of the light controlled by a fixed pattern at a certain distance and angle is directed to the object. By placing a grating pattern between the object to be measured and the source of the light, so the grating pattern will be projected on the object and then will form an interferometric fringes.An image resulted from the projecting process is recorded through a camera which produces analog signal, and then is changed into digital image using analog to digital converter. The data of the digital image resulted is analysed by using computer.The spherical equation of the object to be measured without placing the object on flat surface can be determined by using the least-square method then by using data samples of light lines projected on the object, the light of the object can be measured by substracting the spherical component of the object measured. By doing so the whole shape of a three-dimensional object can be determined using interpolation."

"ABSTRAKTujuan dari penulisan ini adalah untuk menemukan bagaimana cara orang yang terpengaruh oleh buta warna melihat dengan tujuan untuk menentukan bagaimana mereka menjelajahi ruang tertutup dan terbuka sebagai buta warna. Pemahaman yang tepat tentang pengalaman mereka dalam menjelajahi ruang tiga dimensi di industri kreatif sekarang harus dianggap sebagai persyaratan penting. Penelitian dilakukan dengan meminta satu responden dari protanomaly dan satu responden dari protanopia berjalan melalui ruang tertutup monokromatik dan berwarna-warni serta ruang terbuka supaya mereka dapat merasakan kesan dalam ruang tiga dimensi. Menganalisis teori dengan pernyataan yang diperoleh dari pengalaman mereka melalui wawancara, penelitian menunjukkan bahwa keberadaan kontras dan bayangan sangat penting dalam membentuk pengalaman spasial orang yang terpengaruh oleh buta warna melalui kedalaman dalam tiga dimensi. Hasilnya menunjukkan bagaimana ruang terbuka yang mereka alami membuat mereka merasa lebih nyaman daripada ruang tertutup. Disebabkan oleh jumlah penetrasi cahaya dan bayangan yang dihasilkan di ruang terbuka lebih signifikan dibandingkan dengan yang ada di ruang tertutup. Temuan ini menunjukkan perlunya meningkatkan kesadaran dan pendidikan dalam industri kreatif menuju buta warna untuk merancang ruang yang dapat sepenuhnya dialami oleh buta warna.

---

ABSTRACT

The aim of this writing is to discover how people who affected by colour-blindness see, to determine how they explore enclosed and open space as colour-blinds. Appropriate understanding of their experience in exploring three-dimensional spaces in the creative industries should now be considered as an essential requirement. Research is carried out by having one respondent from the protanomaly and one respondent from the protanopia walking through a monochromatic and colourful enclosed space and an outdoor space for them to feel the impression in three dimensions. Analysing the theory with the statements gained from their experience through interviews, the study shows that the existence of contrast and shadow is crucial in making colour-blinds experience space through depth in three dimensions. The result shows how the outdoor space they experienced makes them feel more comfortable than the enclosed space. Caused by the amount of light penetration and the shadows produced in the open space are more significant compared to the one in the enclosed space. These findings suggest the need to improve awareness and education within the creative industries towards colour-blindness in order to design a space that can be fully experienced by colour-blinds."

"The book describes recent research results in the areas of modelling, creation, management and presentation of interactive 3D multimedia content. The book describes the current state of the art in the field and identifies the most important research and design issues. These are, database modelling of 3D content, security in 3D environments, describing interactivity of content, searching content, visualization of search results, modelling mixed reality content, and efficient creation of interactive 3D content. Each chapter is illustrated with example applications based on the proposed approach. The final chapter discusses some important ethical issues related to the widespread use of virtual environments in everyday life. "

"This book is about how to use computer software to manufacture and test virtually semiconductor devices in 3D. It brings to life the topic of semiconductor device physics, with a hands-on, tutorial approach that de-emphasizes abstract physics and equations and emphasizes real practice and extensive illustrations. Coverage includes a comprehensive library of devices, representing the state of the art technology, such as SuperJunction LDMOS, GaN LED devices, etc."

"The first edition of Visualization in medicine and life sciences (VMLS) emerged from a workshop convened to explore the significant data visualization challenges created by emerging technologies in the life sciences. The workshop and the book addressed questions of whether medical data visualization approaches can be devised or improved to meet these challenges, with the promise of ultimately being adopted by medical experts. Visualization in Medicine and Life Sciences II follows the second international VMLS workshop, held in Bremerhaven, Germany, in July 2009. Internationally renowned experts from the visualization and driving application areas came together for this second workshop. The book presents peer-reviewed research and survey papers which document and discuss the progress made, explore new approaches to data visualization, and assess new challenges and research directions."

"Composite sandwich constructions are very widely employed in the modern aircraft industry, honeycomb panels among them. The principal defects of honeycomb sandwiches are cover detachment because of cell collapse or poor adhesive, which can lead to water penetration in cells. Recently, the thermal method of non-destructive testing (infrared thermography) has begun to be applied to the diagnostics of honeycomb constructions, and has some advantages over traditional methods. However, thermal processes are transient, and this complicates the selection of optimal parameters for monitoring. The purpose of this work is to investigate the possibilities of the thermal method for honeycomb panel inspection using computer simulation. The COMSOL Multiphysics package was used for the simulations. A 3D model of the honeycomb panel was proposed, and two possible defects considered: the detachment of the panel cover from the filler and the presence of water in the defective cell. The implementation of the proposed 3D model made it possible to investigate the effect of a defect on the thermal field of the panel surface. The simulation results showed that optimal testing time is significantly different for various types of panels. The correct selection of testing parameters increases the accuracy of the testing procedure. The results of experimental investigation confirmed the adequacy of the proposed model for thermal testing."

"

Weighted computed tomography dose index (CTDI_w) konvensional mungkin tidak sesuai untuk dosimetri three-dimensional rotational angiography (3DRA) karena lebar berkas dan sudut rotasi yang digunakan tidak sama. Penelitian ini dilakukan untuk merumuskan metrik baru dosimetri 3DRA, yakni rotational angiography dose index (RADI) untuk menentukan dosis rata-rata yang lebih akurat dalam bidang cross-sectional dari fantom silinder menggunakan simulasi Monte Carlo. Fantom CTDI standar dan tabung sinar-X pesawat angiografi 3DRA Siemens Artis Zee disimulasikan dengan menggunakan EGSnrc user code. Metode ini mengakomodasi penggunaan dosimeter bilik pengion standar 10 cm untuk cone-beam computed tomography (CBCT) pada 3DRA dengan berkas yang dikolimasi. Komparasi hasil perhitungan dosis menggunakan metode CTDI_w dan RADI dilakukan untuk mengetahui perbedaan relatifnya. Kami menemukan bahwa nilai matrik RADI pada penelitian ini adalah 1/6RADI_c + 1/9RADI₁₂ + 1/5RADI₃ + 1/4RADI₆ + 1/5RADI₉ dengan perbedaan relatif terhadap CTDI_w sebesar 5,35%. Perlu studi lanjutan untuk mengkonfirmasi nilai koefisien RADI terhadap hasil pengukuran sebelum metode ini dapat direkomendasikan untuk digunakan dalam aspek dosimetri dari jaminan kualitas modalitas 3DRA.

KATA KUNCI: angiografi rotasi 3 dimensi; dosimetri; jaminan kualitas; simulasi Monte Carlo.

 

---

The conventional weighted computed tomography dose index (CTDI_w) may not be suitable for dosimetry of three-dimensional rotational angiography (3DRA) owing to the non-standard beam width and angle of rotation. This study was conducted to formulate a new metric of 3DRA dosimetry, namely rotational angiography dose index (RADI) to determine a more accurate average dose in the cross-sectional plane of a cylindrical phantom using Monte Carlo simulation. A standard CTDI phantom and the X-ray tube of a Siemens Artis Zee 3DRA angiography were simulated by employing EGSnrc user code in this research. This method accommodates the use of a standard 10 cm ionization chamber for cone-beam computed tomography (CBCT) in collimated 3DRA beam. Comparison of the results on dose calculations using the CTDI_w and the proposed RADI methods was carried out to determine the relative differences. We found that the RADI metric of this study was 1/6RADI_c + 1/9RADI₁₂ + 1/5RADI₃ + 1/4RADI₆ + 1/5RADI₉ with a relative difference against CTDI_w of 5.35%. Further studies are required to confirm the value of the RADI coefficient on the measurement results before this method can be recommended for use in the dosimetry aspect quality assurance of 3DRA feature.

KEYWORDS : three-dimensional rotational angiography; dosimetry; Monte Carlo simulation; quality assurance.

 

"

"Time-of-flight Cameras and microsoft kinect™ closely examines the technology and general characteristics of time-of-flight range cameras, and outlines the best methods for maximizing the data captured by these devices. This book also analyzes the calibration issues that some end-users may face when using these type of cameras for research, and suggests methods for improving the real-time 3D reconstruction of dynamic and static scenes."