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Aditya Tirta Pratama,Katsuhiko Takahashi,Katsumi Morikawa,Keisuke Nagasawa,Daisuke Hirotani 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.3
Bucket brigades are self-balancing production lines in which each worker can move from one station to the next to continue working on a given part. Sequencing workers from slowest-to-fastest is the best policy for maximizing throughput on a continuous line. Meanwhile, throughput at discrete workstations may decrease due to blocking even though workers are properly sequenced. A method of countering the blocking condition is proposed by integrating bucket brigades and worker collaboration such that a maximum of two workers can collaborate on the same task. Prior assumptions are utilized to investigate and compare the performance of a production line in which the work content of the product at each station is deterministic and the collaboration velocity is proportional to the sum of the individual worker velocities and is influenced by the collaboration coefficient. Possible extended conditions for improvement and a procedure for achieving possibly higher throughput through worker collaboration are described. The characteristics of a self-balancing line can still be preserved, and an improvement in performance can be obtained. The results show that a bucket brigade with worker collaboration between fully cross-trained workers, slowest-to-fastest sequencing, and an additive collaboration coefficient almost always outperforms one without worker collaboration in terms of maximizing throughput.
Aditya Narayan Shiv Shankar Swain,Suvankar Ganguly,Arunava Sengupta,Elanjickal Zachariah Chacko,Swapnil Dhakate,Pankaj Kumar Pandey 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
A coupled thermofluidic-mechanical model has been developed to analyse the thermomechanical state of the solidifying shellin a continuously cast steel billet. The computational fluid dynamics (CFD) based solver simulates the three-dimensionalflow field and solidification of molten steel as it flows inside the mould. Finite element method based thermomechanicalmodel is coupled with the CFD model to determine the resultant temperature distribution and stress–strain evolution in thesolidifying strand. The heat transfer at the mould-billet interface is taken into account by the calculation of heat flux using anovel inverse heat transfer algorithm. Temperature measurements made in the industrial billet mould have been used for thepurpose. Plant experiments and observations are correlated with the numerical results to provide quantitative understandingof the complex thermomechanical process during billet casting. Various parametric studies are also undertaken to examinethe effects of casting speed, superheat and heat flux changes on resultant strain and temperature distribution. It is observedthat the accumulated plastic strains exceed the critical strain at the off-corner region thereby indicating the possibility ofcrack formation in this region. Reduction of heat flux can lead to lowering of the strain rate at the corners and offer a viablesolution for reducing corner cracks.
Aditya Anand,Sarada Prasanna Mallick,Bhisham Narayan Singh,Shikha Kumari,Dheerendra Kumar Suman,Satyavrat Tripathi,Divakar Singh,Pradeep Srivastava 한국생물공학회 2022 Biotechnology and Bioprocess Engineering Vol.27 No.4
Usage of bioreactors in the field of tissue engineering has played a significant role in enabling a controlled and reproducible change in the formation of damaged tissue on being provided with specific factors. Owing to the scarcity seen in providing sufficient donor organs for transplantation there is a huge requirement for large-scale production of artificial organs. This cannot be achieved by static culturing since it does not provide an invivo three-dimensional (3D) microenvironment therefore tissue engineering plays a vital role in the development of artificial tissues and organs as per the clinical demands whereas bioreactors have served a major role in providing the artificial microenvironment required by the cells to grow further into a tissue and then into an organ. By providing the specific biochemical cues and mechanoresponsive stimuli the bioreactors turn to be very effective in generating transplantable organs. Apart from performing studies in a controlled manner aimed at understanding biological and physicochemical effects, bioreactors also ensure the safe and reproducible production of tissueengineered constructs to achieve cost-effective large-scale production. The design criteria for bioreactors to be used in tissue engineering include optimal aspect ratio, proper aeration for the cells to proliferate, and agitation with reduced shear stress. The current review summarizes important aspects like Height/Diameter ratio or aspect ratio, shear stress, mechanical stress, aeration, agitation, oxygenation, etc. related to the design of tissue bioreactors, different types of bioreactors that are in use to date, and the reported pieces of literature to yield an overview on the existing concepts. It mainly focuses on the generation of 3D tissue constructs in various reactor systems specially designed for their culture and development along with their applications.
A Highly-Integrated Analog Front-End IC for Medical Ultrasound Imaging Systems
Aditya Banuaji(아디탸 바누아지),Hyouk-Kyu Cha(차혁규) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.12
초음파 의료 영상 응용 분야를 위한 고전압 고집적 아날로그 front-end 집적회로를 0.18-μm 표준 CMOS 반도체 공정을 이용하여 구현하였다. 제안 된 아날로그 front-end 집적회로는 2.6 MHz에서 15 Vp-p 전압까지 동작하는 트랜지스터 stacking 구조를 이용한 고전압 펄서와, 저전압에서 동작하는 저잡음 transimpedance 증폭기, 그리고 송신부와 수신부의 분리를 위한 고전압 차단 스위치로 구성되어 있다. 설계 된 집적회로는 0.15 mm<SUP>2</SUP> 이하의 작은 면적을 사용함으로써 휴대용 영상 시스템을 포함한 다중 어레이 초음파 의료 영상 시스템에 적용이 가능하다. A high-voltage highly-integrated analog front-end (AFE) IC for medical ultrasound imaging applications is implemented using standard 0.18-μm CMOS process. The proposed AFE IC is composed of a high-voltage (HV) pulser utilizing stacked transistors generating up to 15 Vp-p pulses at 2.6 MHz, a low-voltage low-noise transimpedance preamplifier, and a HV switch for isolation between the transmit and receive parts. The designed IC consumes less than 0.15 mm<SUP>2</SUP> of core area, making it feasible to be applied for multi-array medical ultrasound imaging systems, including portable handheld applications.
Aditya Tadinada,Elnaz Jalali,Wesam Al-Salman,Shantanu Jambhekar,Bina Katechia,Khalid Almas 대한영상치의학회 2016 Imaging Science in Dentistry Vol.46 No.2
Purpose: Sinus elevation procedures have become a routine and reliable way to gain bone volume in the edentulous maxilla for dental implant placement. Presence of bony septations and pathology in the maxillary sinus often cause complications leading to graft or implant failure or both. The aim of this study was to retrospectively evaluate the prevalence of pathology, direction of the septa, and sinus width measured at 2 mm, 5 mm, and 10 mm from the sinus floor in maxillary sinuses using cone-beam computed tomography (CBCT). Materials and Methods: Seventy-two sinuses from 36 random preoperative CBCT scans referred for implant therapy were retrospectively evaluated for the number, prevalence, and direction of bony septations and presence of pathology. Width of the sinus was also measured at 2 mm, 5 mm, and 10 mm from the sinus floor to account for the amount of bone available for implant placement. Results: Maxillary sinus septa were found in 59.7%. Presence of a single septum was noted in 20 sinuses (27.7%), followed by two septa in 17 sinuses. The most common direction of the septum was the transverse direction. Retention pseudocyst and mucosal thickening were the most commonly seen abnormality/pathology. Conclusion: Based on the high prevalence of septa and sinus pathology in this sample, a preoperative CBCT scan might be helpful in minimizing complications during sinus augmentation procedures for dental implant therapy.
Aditya Shekhar,Lucia Beloqui Larumbe,Thiago Batista Soeiro,Yang Wu,Pavol Bauer 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
There is an increasing focus on integrating flexible dc links for bulk power routing in medium voltage distribu-tion grids. In such applications, the ac-dc Modular Multilevel Converter (MMC) devised for medium voltage and high-power ratings can be an interesting choice. This paper highlights some less explored design trade-offs arising due to the limitation on N in relation to modulation frequency and arm inductance. Specifically, the study intends to describe the interdependent influence of each degree of freedom on several aspects such as capacitor voltage balancing, circulating currents and harmonic performance. Finally, the importance of considering interhar-monics in the performance assessment of the MMC instead of the conventional interpretation of distortion calculation is highlighted.
Affective Labour in the Age of Algorithms and its Political Implications
( Aditya Nayak ) 중앙대학교 인문콘텐츠연구소 2021 인공지능인문학연구 Vol.8 No.-
This paper discusses the evolution of the concept of ‘affective labour’ in order to apply it to the contemporary age of algorithms. The paper studies the shift in the nature of communication in the capitalist system of production enabled by the algorithms, and how this has led to an expansion of affective production. Finally, the paper also evaluates the new system of information management and its implications for political systems.
Aditya Tadinada,Karen Fung,Sejal Thacker,Mina Mahdian,Aniket Jadhav,Gian Pietro Schincaglia 대한영상치의학회 2015 Imaging Science in Dentistry Vol.45 No.3
Purpose: This study was performed to evaluate the diagnostic efficacy of panoramic radiography and cone-beam computed tomography (CBCT) in detecting sinus pathology. Materials and Methods: This study was based on a retrospective evaluation of patients who had undergone both a panoramic radiograph and a CBCT exam. A total of 100 maxillary sinuses were evaluated. Four examiners with various levels of expertise evaluated the images using a five-point scoring system. Receiver operating characteristic (ROC) curve analysis was performed to evaluate the diagnostic efficacy of the two modalities. The image analysis was repeated twice, with at least two weeks between the evaluation sessions. Interobserver reliability was assessed using Cronbach’s alpha, and intraobserver reliability was assessed using Cohen’s kappa. Results: Maxillary sinus pathology was detected in 72% of the patients. High interobserver and intraobserver reliability were observed for both imaging modalities and among the four examiners. Statistical analyses using ROC curves demonstrated that the CBCT images had a larger area under the curve (0.940) than the panoramic radiographs (0.579). Conclusion: Three-dimensional evaluation of the sinus with CBCT was significantly more reliable in detecting pathology than panoramic imaging.