Flipped Technique Research Articles

An inductorless piezoelectric energy harvesting interface circuit using gyrator induced voltage flip technique

PurposeThe purpose of this research paper is to explore the possibility to enhance the power transfer from piezoelectric energy harvester (PEH) source to the load. As the proposed gyrator-induced voltage flip technique (GIVFT) does not require bulky components such as physical inductors, it is easily realizable in small integrated circuits (IC) package thereby offering performance benefits, reducing area overhead and providing cost benefits for constrained self-powered autonomous Internet-of-Things (IoT) applications.Design/methodology/approachThis paper presents an inductorless interface circuit for PEH. The proposed technique is called GIVFT and is demonstrated using active elements. The authors use gyrator to induce voltage flip at the output side of PEH to enhance the charge extraction from PEH. The proposed technique uses the current-voltage (I-V) relationship of gyrator to get appropriate phasor response necessary to induce the voltage flip at the output of PEH to gain power transfer enhancement at the load.FindingsThe experimental results show the efficacy of the GIVFT realization for enhanced power extraction. The authors have compared their proposed design with popular earlier reported interface circuits. Experimentally measured performance improvement is 1.86×higher than the baseline comparison of full-wave bridge rectifier circuit. The authors demonstrated a voltage flip using GIVFT to gain power transfer improvement in piezoelectric energy harvesting.Originality/valueTo the best of the authors’ knowledge, pertaining to the field of PEH, this is the first reported GIVFT based on the I-V relationship of the gyrator. The proposed approach could be useful for constrained self-powered autonomous IoT applications, and it could be of importance in guiding the design of new interface circuits for PEH.

Beyond the Chemotherapy Certificate: Building a Knowledge Base Virtually for Oncology Nursing Practice Across a Health System.

In a 51-hospital system serving seven states in the western United States, an organizational assessment in 2016 indicated critical staff shortages in one region for chemotherapy and immunotherapy-trained nurses. Leadership across the system was also concerned about nurse retention and turnover rates. Oncology nursing professional development practitioners designed and implemented a new multimodal oncology curriculum that utilizes a flipped classroom technique. Results indicate that first-year turnover rates were lower in nurses who participated. Healthcare systems are encouraged to invest in organizational infrastructure to implement nurse transition into practice programs to prepare, sustain, and stimulate specialization in oncology nursing.

Facilitated Umbilical Positioning in Abdominoplasty Using the 15/10 Rule and the "Flap Flipping" Technique.

Summary:First described by Gaudet and Morestin, abdominoplasty with umbilical preservation dates as far back as 1905. Navel position was described on the transverse axis by Rohrich, and on the median longitudinal axis, by Vernon, Baroudi and Pitanguy. The aim of this article is to validate the 15/10 rule of umbilical positioning in abdominoplasty with the “flap flipping” technique, as an intraoperative aid to simplify umbilical repositioning. Between October 2019 and March 2020, 18 consecutive patients underwent full abdominoplasty, using the 15/10 rule for umbilical positioning. Patients’ average age was 47.9, with body mass index 27.5 kg/m2 and height 1.63 m. An “expected zone” of umbilical position was delineated by 2 horizontal lines, 15 cm from the bra line and 10 cm from the pubic level. The umbilicus was accurately positioned by using the flap flipping technique before closure of the inferior abdominal incision line. It was then examined to determine whether the umbilicus was situated in the expected zone. In 14 of 18 patients, intraoperative and postoperative measurements of umbilical position were in the expected zone. An average 15.19 cm was measured between the bra line and the new umbilical positioning, and 12.02 cm from the new umbilicus to the pubic inferior suture line. We find that the 15/10 rule of umbilical positioning with the flap flipping technique is an important, intuitive, and easy-to-use guide for precise umbilical positioning in abdominoplasty.

Uporedna analiza vrhunskih evropskih seniorki i juniorki u stonom tenisu - dužina poena i igra posle serve i prijema serve

The aim of the study was to compare elite junior and senior women table tennis players, using three parameters of the table tennis: rally length, serve and receive analysis. Twenty-five junior and twenty-five elite senior matches were analysed (total: 263 sets and 4958 points) between players ranked in Top 25 in ETTU rankings in the last two years. All the athletes used an offensive style of play. The results of non-parametric Mann-Whitney U Test, showed a significantly higher rally length in senior compared to junior category (4.46 vs. 3.93). Moreover, the results of Pearson's Chi-square tests show an association between the age categories and selected parameters (laterality, technique and placement) for both serve and receive. Different behavior between the two categories was noted. The senior players used more the flip technique (22.2 % vs 14.7 %) and short push to return the services of the opponents (32.5 % vs 26.0 %). These results provide useful information to analyze junior players' behavior compared to the senior players in order to plan specific training sessions. It can be also useful to identify some parameters as predictors of the future success for junior players.

Proximity-induced superconducting gap in the quantum spin Hall edge state of monolayer WTe2

The quantum spin Hall (QSH) state was recently demonstrated in monolayers of the transition metal dichalcogenide 1T'-WTe$_2$ and is characterized by a band gap in the two-dimensional (2D) interior and helical one-dimensional (1D) edge states. Inducing superconductivity in the helical edge states would result in a 1D topological superconductor, a highly sought-after state of matter. In the present study, we use a novel dry-transfer flip technique to place atomically-thin layers of WTe$_2$ on a van der Waals superconductor, NbSe$_2$. Using scanning tunneling microscopy and spectroscopy (STM/STS), we demonstrate atomically clean surfaces and interfaces and the presence of a proximity-induced superconducting gap in the WTe$_2$ for thicknesses from a monolayer up to 7 crystalline layers. At the edge of the WTe$_2$ monolayer, we show that the superconducting gap coexists with the characteristic spectroscopic signature of the QSH edge state. Taken together, these observations provide conclusive evidence for proximity-induced superconductivity in the QSH edge state in WTe$_2$, a crucial step towards realizing 1D topological superconductivity and Majorana bound states in this van der Waals material platform.

Soft-information flipping scheme based on a priori LLRs summation for ultra-high density magnetic recording

Inter-track interference (ITI) is the main problem in high areal density (AD) of magnetic recording systems such as bit-patterned magnetic recording (BPMR) technology thus the ITI avoidance scheme is the way to improve the performance of the recording system. Two-dimensional (2D) modulation codes i.e., the rate-5/6 2D modulation code, was proposed to avoid the severe ITI effect which can successfully improve the system performance when it was considered without the codeword border effect. However, when we have to consider the codeword border effect, some upper and lower tracks cannot avoid ITI because both of them still be interfered from their sidetracks. To improve this weakness, a rate-5/6 2D modulation code was combined with the bit-flipping technique based on the normalization criteria of the two-dimensional soft-output Viterbi algorithm (2D-SOVA). Although, the bit-flipping technique can improve the performance of all tracks; however, the gain optimization is difficult to describe the relationship of the soft-information flipping technique. Therefore, this research proposes a novel of soft-information flipping scheme to describe the bit-flipping technique based on a priori log-likelihood ratios of the rate-5/6 encoding constraint in BPMR system. The simulation results clearly indicate that, at the same user density, the proposed system can provide bit-error-rate performance gain over the other recording systems in both of with and without position jitter noise.

Metodologias Ativas no Processo de Ensino-Aprendizagem Utilizando Seminários como Ferramentas Educacionais no Componente Curricular Química Geral

O presente estudo buscou avaliar algumas metodologias ativas no processo de ensino-aprendizagem através da utilização dos seminários em conjunto com a técnica de sala de aula invertida como ferramenta educacional. Participaram deste estudo alunos da graduação do curso de Engenharia da Universidade Federal de Itajubá, em Minas Gerais, focando na componente curricular de Química Geral. A proposta constituiu na apresentação de três temas associados às Ligações Químicas: Estrutura de Lewis, Regra do Octeto e Ligação Iônica. Assim, a turma foi dividida em grupos e para cada grupo atribuiu-se um determinado tema. A avaliação do método como eficaz ou não, foi realizada considerando a opinião dos próprios discentes através de um questionário avaliativo. Os resultados obtidos através da aplicação dessa metodologia foram satisfatórios, visto que grande parte da turma contribuiu de forma positiva para que os seminários fossem concluídos. Através deste estudo conclui-se que as metodologias ativas são responsáveis por promover habilidades tanto sociais quanto acadêmicas no discente, como discussão, argumentação, oratória e audição, conferindo assim uma maior dinamicidade ao processo de ensino-aprendizagem.

A comparative study of deep learning architectures on melanoma detection

Melanoma is the most aggressive type of skin cancer, which significantly reduces the life expectancy. Early detection of melanoma can reduce the morbidity and mortality associated with skin cancer. Dermoscopic images acquired by dermoscopic instruments are used in computational analysis for skin cancer detection. However, some image quality limitations such as noises, shadows, artefacts exist that could compromise the robustness of the skin image analysis. Hence, developing an automatic intelligent system for skin cancer diagnosis with accurate detection rate is crucial. In this paper, we evaluate the performance of several state-of-the-art convolutional neural networks in dermoscopic images of skin lesions. Our experiment is conducted on a graphics processing unit (GPU) to speed up the training and deployment process. To enhance the quality of images, we employ different pre-processing steps. We also apply data augmentation methodology such as horizontal and vertical flipping techniques to address the class skewness problem. Both pre-processing and data augmentation could help to improve the final accuracy.

Improving photovoltaic panel performance using a flipping technique - analysis and feasibility study

Scientists all over the world are striving to improve the efficiency of the photovoltaic panel by many different techniques to maintain its temperature in the range of PV operation. In this paper a new technique of cooling photovoltaic panels PVs is suggested and investigated theoretically based on experimental behaviour obtained for a single PV panel. This technique is based on a flipping method consisting of two PV panels A and B installed at the opposite direction of each other. Initially Panel A is active, after certain time when the temperature of panel A increases above a prescribed limit, the system rotates the panels to become panel B the active panel. This technique is based on previous experiment and studied at two different flipping temperatures (36°C, 42°C). Results showed that as the flipping temperature decrease, the operating temperature of the PV will decrease, which results in higher power generation. There is a significant enhancement in the power per unit area that can be a solution for using PVs in restricted areas.

Improving photovoltaic panel performance using a flipping technique - analysis and feasibility study

Scientists all over the world are striving to improve the efficiency of the photovoltaic panel by many different techniques to maintain its temperature in the range of PV operation. In this paper a new technique of cooling photovoltaic panels PVs is suggested and investigated theoretically based on experimental behaviour obtained for a single PV panel. This technique is based on a flipping method consisting of two PV panels A and B installed at the opposite direction of each other. Initially Panel A is active, after certain time when the temperature of panel A increases above a prescribed limit, the system rotates the panels to become panel B the active panel. This technique is based on previous experiment and studied at two different flipping temperatures (36°C, 42°C). Results showed that as the flipping temperature decrease, the operating temperature of the PV will decrease, which results in higher power generation. There is a significant enhancement in the power per unit area that can be a solution for using PVs in restricted areas.

Integrating Flipped classroom Technique with High Fidelity Simulation for Teaching Hemorrhagic Shock to EMS Students at Pune, India—A Pilot Study

Integrating Flipped classroom Technique with High Fidelity Simulation for Teaching Hemorrhagic Shock to EMS Students at Pune, India—A Pilot Study

Simplifying the ShangRing technique for circumcision in boys and men: use of the no-flip technique with randomization to removal at 7 days versus spontaneous detachment.

To assess safety of the no-flip ShangRing male circumcision technique and to determine clinical course and safety of spontaneous detachment (i.e., allowing the device to fall off), we conducted a case series of no-flip ShangRing circumcision combined with a randomized controlled trial of removal 7 days postcircumcision versus spontaneous detachment at two health facilities in Kenya. The primary outcome was the safety of the no-flip technique based on moderate and severe adverse events (AEs) during the procedure and through 42-day follow-up. A main secondary outcome was clinical course and safety of spontaneous detachment. Two hundred and thirty males 10 years and older underwent no-flip circumcision; 114 randomized to 7-day removal and 116 to spontaneous detachment. All circumcisions were successfully completed. Overall 5.3% (6/114) of participants in the 7-day group and 1.7% (2/116) in the spontaneous group had an AE; with no differences when compared to the 3% AE rate in historical data from African studies using the original flip technique (P = 0.07 and P = 0.79, respectively). Overall 72.4% (84/116) of participants in the spontaneous group wore the ShangRing until it detached. Among the remaining (27.6%; 32/116), the ring was removed, primarily at the participants' request, due to pain or discomfort. There was no difference in AE rates (P = 0.169), visit day declared healed (P = 0.324), or satisfaction (P = 0.371) between randomization groups. The median time to detachment was 14.0 (IQR: 7–21, range: 5–35) days. The no-flip technique and spontaneous detachment are safe, effective, and acceptable to boys and men 10 years and older. Phimosis and penile adhesions do not limit successful ShangRing circumcision with the no-flip technique.

Pearls and Pitfalls of the ToggleLoc With ZipLoop for Anterior Cruciate Ligament Reconstruction

The ToggleLoc with ZipLoop is an adjustable suspensory device for anterior cruciate ligament reconstruction. However, there is no string to flip the button in the device because it has only one hole and one string. Therefore, the surgeon cannot use the button flip technique. The purpose of this article is to present the pearls and pitfalls of using ToggleLoc with ZipLoop. While preparing the ACL graft, we draw a 15- to 20-mm-width marking in the adjustable loop at the same length as the femoral tunnel depth. While passing of the graft, the tensioning sutures are placed at the anterior side to make sure they pass through the medial portal smoothly. The proximal passing suture and distal adjustable loop is pulled to the opposite direction by one surgeon's hands while passing the button. We stop pulling the sutures just at the marking while feeling the button being passed over the lateral femoral cortex. The distal artificial ligament is held distally with moderate tension while passing the graft. Although there are some pitfalls and knacks, the present technique is easy and certainly helps surgeons achieve appropriate positioning of the button.

Hook and flip technique: for phacoemulsification in non-rotating nuclei and posterior polar cataracts.

We put forward a physical levitation method to hook and flip the chopped nuclear fragments that could not be solely drawn by vacuum during phacoemulsification, due to various reasons such as a non-rotating nuclei or posterior polar cataracts where hydrodissection was unsuccessful or contra-indicated, respectively. A Sinskey hook is insinuated through the crack of the divided nuclei into a plane behind the nuclear pie to 'hook and flip' the chopped piece, heading it towards the phacoemulsification probe. This simple step disassembles the nuclear chunk, thereby creating space to facilitate the dismantling of the rest of the fragments. The remnant epinuclear cushion guards the posterior capsule, mitigating the chances of serious intra-operative complications. We have employed this technique in 17 eyes during similar situations. No specific intra-operative complications were observed; all surgeries were uneventful. A Sinskey hook utilised for this step ensures safety and familiarity, none encountered posterior capsular rent. This technique not only eases the surgery, but also decreases the anticipated intra-operative and post-operative complications. 'Hook and flip technique' thus proves useful whenever dismantling difficulties are encountered during phacoemulsification.

Notice of Retraction Digital Image Steganography Using Bit Flipping

<p><strong>Notice of Retraction</strong><br /><br />-----------------------------------------------------------------------<br />After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IAES's Publication Principles.<br /><br />We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.<br /><br />The presenting author of this paper has the option to appeal this decision by contacting info@iaesjournal.com.<br /><br />-----------------------------------------------------------------------</p><p>This article proposes bit flipping method to conceal secret data in the original image. Here a section consists of 2 pixels and there by flipping one or two LSBs of the pixels to hide secret information in it. It exists in 2 variants. The variant-1 and variant-2 both use 7<sup>th</sup> and 8<sup>th</sup> bit to conceal the secret data. Variant-1 hides 3 bits per a pair of pixels and the variant-2 hides 4 bits per a pair of pixels. Our proposed method notably raises the capacity as well as bits per pixel that can be hidden in the image compared to existing bit flipping method. The image steganographic parameters such as, peak signal to noise ratio (PSNR), hiding capacity, and the quality index of the proposed techniques has been compared with the existing bit flipping technique</p>

A novel vibration sensor system for frequency measurement based on Bias Flip technique

This paper describes a new type of vibration sensor system for the real-time measurement of vibration frequency. The proposed sensor system consists of a piezoelectric energy harvesting device and a signal conditioning circuit. The piezoelectric energy harvesting device is used to sense and convert ambient vibration to a relevant output voltage. The signal conditioning circuit, made up by a Bias-Flip circuit, a pulse shaper and a low pass filter, is employed to generate a DC output voltage which is proportional to the magnitude of the vibration frequency. The proposed vibration sensor system is successfully demonstrated through SPICE simulation. In addition, an experimental setup has been designed and fabricated to verify the proposed system. When the sinusoidal vibration excitation from 200 Hz to 500 Hz is applied to the vibration sensor system, the measurement results fit very well with the theoretical prediction. The relative error between theoretical and experimental results is less than 1.6%.

Digital Image Steganography Using Bit Flipping

Abstract This article proposes bit flipping method to conceal secret data in the original image. Here a block consists of 2 pixels and thereby flipping one or two LSBs of the pixels to hide secret information in it. It exists in two variants. Variant-1 and Variant-2 both use 7th and 8th bit of a pixel to conceal the secret data. Variant-1 hides 3 bits per a pair of pixels and the Variant-2 hides 4 bits per a pair of pixels. Our proposed method notably raises the capacity as well as bits per pixel that can be hidden in the image compared to existing bit flipping method. The image steganographic parameters such as, Peak Signal to Noise Ratio (PSNR), hiding capacity, and the Quality Index (Q.I) of the proposed techniques has been compared with the results of the existing bit flipping technique and some of the state of art article.

Tetrahedral mesh improvement using moving mesh smoothing, lazy searching flips, and RBF surface reconstruction

Given a tetrahedral mesh and objective functionals measuring the mesh quality which take into account the shape, size, and orientation of the mesh elements, our aim is to improve the mesh quality as much as possible. In this paper, we combine the moving mesh smoothing, based on the integration of an ordinary differential equation coming from a given functional, with the lazy flip technique, a reversible edge removal algorithm to modify the mesh connectivity. Moreover, we utilize radial basis function (RBF) surface reconstruction to improve tetrahedral meshes with curved boundary surfaces. Numerical tests show that the combination of these techniques into a mesh improvement framework achieves results which are comparable and even better than the previously reported ones.

Exploring Moral Thinking Using Videos in Flipped Classroom

In the advent of technology, over loaded of information often mislead the moral thinking of an individual. Moral thinking needs to be aligned with proper teaching in the classroom. Therefore, active learning is an important approach to enhance the students learning process. Active learning could be enhanced through the presence of flipped classroom technique. A flipped classroom is an important tool to facilitate the students moral thinking in the 21st-century learning. This research explores the dimensions of flipped classroom based on the usage of videos in the classroom. The usage of the videos in the classroom, especially in pre-lesson has provided impetus for the students learning process. The learning platform such as schoology, immensely made the pre-lessons easily conducted. This made the active learning in the classroom more dynamic and meaningful. This paper provides an alternative for teaching and learning technique particularly in Moral studies.

Femtosecond Laser Processing of Membranes for Sensor Devices on different Bulk Materials

We demonstrate that diaphragms for sensor applications can be fabricated by laser ablation in a~variety of substrates such as ceramics, glass, sapphire or SiC. However, ablation can cause pinholes in membranes made of SiC, Si and metals. Our experiments indicate that pinhole defects in the ablated membranes are affected by ripple structures related to the polarization of the laser. From our simulation results on light propagation in Laser-Induced Periodic Surface Structures (LIPSS) we find out that they are acting as a slot waveguide in SiC material. The results further show that field intensity is enhanced inside LIPSS and spreads out at surface distortions promoting the formation of pinholes. The membrane corner area is most vulnerable for pinhole formation. Pinholes funnel laser radiation into the bulk material causing structural damage and stress in the membrane. We show that a~polarization flipping technique inhibits the formation of pin holes caused by LIPSS.