Use of a gesture user interface as a touchless image navigation system in dental surgery: Case series report

Guillermo M. Rosa,María L. Elizondo 대한영상치의학회 2014 Imaging Science in Dentistry Vol.44 No.2

Purpose: The purposes of this study were to develop a workstation computer that allowed intraoperative touchless control of diagnostic and surgical images by a surgeon, and to report the preliminary experience with the use of the system in a series of cases in which dental surgery was performed. Materials and Methods: A custom workstation with a new motion sensing input device (Leap Motion) was set up in order to use a natural user interface (NUI) to manipulate the imaging software by hand gestures. The system allowed intraoperative touchless control of the surgical images. Results: For the first time in the literature, an NUI system was used for a pilot study during 11 dental surgery procedures including tooth extractions, dental implant placements, and guided bone regeneration. No complications were reported. The system performed very well and was very useful. Conclusion: The proposed system fulfilled the objective of providing touchless access and control of the system of images and a three-dimensional surgical plan, thus allowing the maintenance of sterile conditions. The interaction between surgical staff, under sterile conditions, and computer equipment has been a key issue. The solution with an NUI with touchless control of the images seems to be closer to an ideal. The cost of the sensor system is quite low; this could facilitate its incorporation into the practice of routine dental surgery. This technology has enormous potential in dental surgery and other healthcare specialties.

DASJ : A Hadoop-based and Approximate Approach for Similarity Join Computations in Metric Spaces

Guillermo Crocker Garcia,Kifayat Ullah Khan,Young-Koo Lee 한국정보과학회 2015 한국정보과학회 학술발표논문집 Vol.2015 No.12

Addition of passive-carriage for increasing workspace of cable robots: automated inspection of surfaces of civil infrastructures

Guillermo Rubio-Gómez,Sergio Juárez,David Rodríguez-Rosa,Enrique Bravo,Erika Ottaviano,Antonio Gonzalez-Rodriguez,Fernando J. Castillo-Garcia 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.27 No.2

Cable-driven robots are parallel manipulators in which rigid links are replaced by actuated cables. The end-effector is then supported by a set of cables commanded by motors that are usually placed in a fixed frame. By varying the cables length, it is possible to change the end-effector position and/or orientation. Among the advantages presented by cable robots are they light-weight structure, high energy efficiency and their ability to cover large workspaces since cables are easy to wind. When high-speed operation is not required, a safer solution is to design cable-driven suspended robots, where all vertical components of cables tension are against gravity direction. Cable-driven suspended robots present limited workspace due to the elevated torque requirements for the higher part of the workspace. In this paper, the addition of a passive carriage in the top of the frame is proposed, allowing to achieve a much greater feasible workspace than the conventional one, i.e., with the same size as the desired inspection area while maintaining the same motor requirements. In the opposite, this new scheme presents non-desired vibration during the end-effector maneuvers. These vibrations can be removed by means of a more complex control strategy. Kinematics and dynamics models are developed in this paper. An analysis of sensor system is carried out and a control scheme is proposed for controlling the end-effector pose. Simulation and experimental results show that the feasible workspace can be notoriously increased while end-effector pose is controlled. This new architecture of cable-driven robot can be easily applied for automated inspection and monitoring of very large vertical surfaces of civil infrastructures, such as facades or dams.

Insights into HMF catalysis

Guillermo Portillo Perez,Agneev Mukherjee,Marie-Josée Dumont 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.70 No.-

In recent decades, the concept of biorefinery has gained considerable momentum as a promisingapproach to obtain energy commodity chemicals. 5-hydroxymethylfurfural (HMF) is one of the mostpromising building blocks for biobased chemicals and a strong candidate for large scale production. However, one of the main factors holding its transition is the need for green, sustainable, andfinanciallyfeasible processes. This review provides a critical assessment of the progresses made towards catalyticand autocatalytic systems used for HMF production, as well as advancements in catalyst research, theirmechanisms analyses, efficiency and sustainability. It also provides key information which can facilitatethe selection and development of catalysts for HMF production.

Identification of Eligible Studies

( Guillermo Delgado-garcia ) 대한류마티스학회 2018 대한류마티스학회지 Vol.25 No.1

Optimising Ink Setting Properties on Double Coated Wood-free Papers

GUILLERMO BLUVOL,ROGER CARLSSON 한국펄프·종이공학회 2006 한국펄프종이학회 기타 간행물 Vol.- No.-

Today’s requirements for print-press runnability and print quality demand an optimised absorption and adhesion of printing ink on the paper surface. Modern coating concepts for high glossing offset grades use ultra fine pigments, whereas binder level has continuously been decreased to a minimum in recent years to achieve the highest possible sheet gloss development and for economical reasons. Both the ultra fine pigments and the reduced binder levels lead in many cases to a faster ink setting rate. On the other hand, matt paper grades use relatively coarse pigments leading to a slow ink setting compared to the high glossing papers. Both too fast and too slow ink setting properties implicate drawbacks in print quality and print press runnability. The mechanisms behind the interactions between ink and coating have been presented in many previous publications. The purpose of this study was to determine and quantify how the ink setting rate is influenced by pigment system (GCC and GCC/clay blends), latex level and latex properties in the topcoat of double coated sheet fed offset paper. The roles of binder level and type in the precoat were also assessed. The effect of calendering (temperature and pressure) was studied with one formulation. The resulting ink setting characteristics were tested using three different laboratory testing instruments. The correlation amongst the different laboratory testing methods is discussed. The results show that by varying the latex properties, the pigment system and/or latex addition level, the ink tack development of ink applied to a topcoat pigment system can be significantly influenced. It can be slowed down as often desired with ultra fine pigments or speeded up in the case of coarse pigments. There was no visible effect on the ink setting rate by using different binder systems in the precoat.

Effect of Business Relatedness on Mergers and Acquisitions: Using 10-k Annual Reports

Guillermo Valdez,Byounggu Choi 한국경영정보학회 2021 한국경영정보학회 학술대회논문집 Vol.2021 No.6

Ulinastatin treatment and renal injury in patients undergoing aortic valve replacement with cardiopulmonary bypass. A note of aution

Guillermo Lema 대한마취통증의학회 2013 Korean Journal of Anesthesiology Vol.64 No.1

Optimal Reconstruction of the Damage Distribution in Bridge Decks by Measuring the Noisy Response Induced by Traffic Loads

Guillermo Rus,이상열 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.6

The purpose of this study is to reconstruct the damage distribution in bridge decks by measuring the noisy response induced by traffic loads. A model-based inverse problem is proposed, where a search algorithm finds the damage parameters that minimize the discrepancy between measurements and simulations that depend on those unknown parameters. Two theoretical contributions are developed and validated: (1) a semi-analytical estimation of the probability of detection, which provides a robust criterion to optimize the positions of sensors, and (2) a measurement filter to maximize the identifiability of damage under noisy measurements, which is also optimized. The two main practical contributions are (1) the feasibility of the proposed model-based inverse problem to reconstruct damage in complex structures such a bridge decks with moving loads under realistic levels of noise and realistic spatial distributions of the structural damage, and (2) the understanding of the complex nature of the damage-deck-moving load interactions provided by a parametric study for different bridge designs, different deck thickness-length ratios, one and two spans and a range of moving load speeds. The feasibility of the proposed inverse problem strategy is validated and shown capable of reconstructing the damage characteristics, with computational efficiency and under realistic levels of noise.

The fibrogenic process and the unleashing of acute-on-chronic liver failure

Guillermo Nahúm López-Sánchez,Mayra Dóminguez-Pérez,Misael Uribe,Natalia Nuño-Lámbarri 대한간학회 2020 Clinical and Molecular Hepatology(대한간학회지) Vol.26 No.1

Acute-on-chronic liver failure (ACLF) is a life-threatening condition characterized by a rapid deterioration of previously well-compensated chronic liver diseases. One of the main obstacles in ACLF is the lack of knowledge of the pathogenesis and specific broad-spectrum treatments. An excessive systemic inflammatory response has been proposed to explain the pathogenesis of ACLF; this hypothesis involves stellate cells, which are implicated in many liver homeostatic functions that include vitamin A storage, regulation of sinusoidal blood flow, local inflammation, maintenance of the hepatocyte phenotype and extracellular matrix remodeling. However, when there is damage to the liver, these cells are the main target of the inflammatory stimulus, as a result, the secretion of the extracellular matrix is altered. Activated hepatic stellate cells raise the survival of neutrophils by the stimulation of granulocytes colonies and macrophages, which exacerbates liver inflammation and promotes damage to hepatocytes. Elevation of pathogen-associated molecular patterns is related to liver damage by different pathophysiological mechanisms of decompensation, showing ballooning degeneration and cell death with a predominance of cholestatic infection. Moreover, patients with ACLF present a marked elevation of C-reactive protein together with an elevation of the leukocyte count. Chronic liver disease is a complex pathological state with a heterogeneous pathophysiology in which genetic factors of the host and external triggers interact and culminate in hepatic insufficiency. The better understanding of such interactions should lead to a better comprehension of the disease and to the discovery of new treatment targets that will make acute decompensations preventable and even decrease mortality.