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.

A System of Contexts for the Analysis of Electroacoustic Music

Guillermo Pozzati(기예르모 포자티) 한국전자음악협회 2021 에밀레 Vol.19 No.-

전자음악의 분석을 위한 문맥의 시스템을 소개한다. 네 가지 유형의 문맥을 고려하여 음악분석을 위한 이론적 시스템의 기본 구성요소로 활용한다. 우선, 있는 그대로의 그 작품 자체로 정의되는 맥락인데, 작품을 구성하는 모든 사운드, 구조, 이벤트, 소리개체들은 그 작품의 부분으로 이들이 유기적으로 혼합되며 한 단위로서 그 작품으로서의 정체성을 갖게 한다. 다음은, 청자가 음악을 듣기 전에 가지고 있었거나 만들어진 지식, 경험, 기대, 신념, 평가 기준 등 모든 마음의 덩어리로 형성된 문맥이 있다. 두 가지 유형의 작품 내 하위 문맥도 고려하였는데, 그 중 한가지는 동떨어진 독립된 소리에 관한 것이고, 다른 하나는 몇 가지 사운드를 포괄하는 음악세션<SUB>segments</SUB>에 대한 것이다. 이러한 문맥간 상호작용을 탐구하기 위해 여덟 가지의 관계유형을 정하고 어떻게 실제 음악작품에서 작용하는지 예시를 들어보았다. 감축된<SUB>reduced</SUB> 청취, 프랙탈성<SUB>fractality</SUB>, 사운드, 음악작품, 음악적 스타일 등 음악분석에서 사용하는 많은 일반 용어와 개념을 이러한 상호작용의 관점으로 검토하였다. A system of contexts for the analysis of electroacoustic music is introduced. Four different types of context are considered and taken as the basic components of a theoretical system for musical analysis. On the one hand, there is the context defined by the work itself, made up of all the sounds, structures, events and sound objects that are part of the piece and whose organization allows the work to be identified as such, as a unit. On the other hand, there is the context formed by all the baggage of knowledge, experiences, expectations, beliefs and assessment criteria that the listener has built or acquired prior to listening to the piece of music. Two types of sub-contexts within the piece are also taken into consideration, the one defined by isolated sounds and that defined by musical segments encompassing several sounds. To explore the interactions between these contexts eight types of relationships between them are defined and examples of how they operate in real musical pieces are given. A multitude of usual terms and concepts in musical analysis such as reduced listening, fractality, sound, musical piece, musical style, etc. are reviewed in light of these interactions.

Isometric strength of upper limb muscles in youth using hand-held and hand-grip dynamometry

Guillermo Mendez-Rebolledo,Arturo Ruiz-Gutierrez,Sebastian Salas-Villar,Eduardo Guzman-Muñoz,Sergio Sazo-Rodriguez,Eric Urbina-Santibáñez 한국운동재활학회 2022 JER Vol.18 No.3

New two-step wedge liver resection technique: “zoom resection”

Guillermo Pfaffen,Nicolas Ortiz,Jose Sotelo,Rodrigo Moran Azzi,Victor Serafini 한국간담췌외과학회 2018 Annals of hepato-biliary-pancreatic surgery Vol.22 No.4

Different surgical procedures have been described for the treatment of colorectal liver metastases. The appropriate surgical approach depends, among many other factors, on the relationship between liver metastases and suprahepatic veins. If possible, the detachment of colorectal liver metastasis from suprahepatic veins is a good alternative liver parenchyma sparing technique. In this study, we describe a new two-step wedge liver resection technique for colorectal liver metastases located between suprahepatic veins. Prior to resection, intraoperative ultrasound is employed in order to plan and guide both steps. Initially, we place stitches and resect a cylindrical piece of normal liver parenchyma above the tumor and suprahepatic veins. Next, we place stitches on the future specimen located between suprahepatic veins, then resect it. The main advantages of this procedure are the good visualization and vascular control that may be achieved during the detachment of the tumor from suprahepatic veins. We call this procedure “zoom resection” because its dynamics are similar to the workings of a photograph cameras telescopic system. We present the case of a 55-year-old patient diagnosed with multiple colorectal liver metastases, one of which was resected through this technique.

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.

Pseudo-parallel Real Hypersurfaces in Complex Space Forms

Guillermo A. Lobos,Miguel Ortega 대한수학회 2004 대한수학회보 Vol.41 No.4

Pseudo-parallel real hypersurfaces in complex space forms can bedefined as an extrinsic analogues of pseudo-symmetric realhypersurfaces, that generalize the notion of semi-symmetric realhypersurface. In this paper a classification of thepseudo-parallel real hypersurfaces in a non-flat complex spaceforms is obtained.

Production of an Acidic Polygalacturonase from Aspergillus kawachii by Solid State Fermentation and Their Application for Pectin Extraction

Guillermo Cristian Guadalupe M,Louise Wicker,Cristobal Noe Aguilar,Raul Rodriguez-Herrera,Juan Carlos Contreras-Esquivel 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.3

An acidic polygalacturonase (PG) from Aspergillus kawachii was produced by solid state fermentation employing a polyurethane foam support. The conditions used for the production of acidic PG were particle size of support (0.6 or 500 ㎣) and fermentation time. From the factors studied, the particle size had important influence on enzyme production. The best conditions for acidic PG production were 0.6 ㎣ particle size, 18 hr at 30℃ and initial pH of 5.0. In addition, pectin was extracted from citrus pomaces (grapefruit, lime, and tangerine) by acidic PG at 50℃ for 24 hr with citric acid solution. Infrared spectroscopy showed that lime pomace had more high-methoxylated (65%) endogenous pectin than was obtained than from grapefruit or tangerine pomaces. The enzymatically extracted pectin yield in dry basis (d.b.) for grapefruit and lime pectins were 6.95 and 4.25%, respectively. The citric acid solution alone also contributed to pectin extraction from citrus pomaces (7-9%, d.b.). Limited pectin extraction by acidic PG from tangerine pomace was most likely due to the presence of low-methoxylated endogenous pectin. The enzymatic method for pectin extraction using acidic PG from A. kawachii is a promising technique for releasing highly polymerized pectic substances from high-methoxylated lime or grapefruit pomaces.

An Algorithm to Obtain Boat Engine RPM from Passive Sonar Signals Based on DEMON Processing and Wavelets Packets Transform

Guillermo Kemper,David Ponce,Joel Telles,Christian del Carpio 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.6

The detection of the engine rotational speed in revolutions per minute (RPM) is of great importance to estimate the speed of boats. This value can be obtained from the fundamental frequency component of acquired sonar signals. However, detection can often be seriously afected by noise and distortion introduced by the underwater environment. Several methods have been proposed for fundamental component detection, but they do not specifcally take advantage of the passive sonar signal characteristics to improve the performance of the process. In this context, the proposed algorithm uses DEMON processing applied to wavelets packets subbands to exploit the characterization of the sonar signal in the time and frequency domains. The algorithm involves signal segmentation, wavelet packet decomposition, subband envelope cross-correlation and fundamental component detection from the power spectrum. The method was applied in passive sonar signals acquired in navigation and also obtained by simulation. The performance of the proposed algorithm was evaluated with signals of diferent SNR values that were also corrupted by a simulated multipath underwater channel. The signals were evaluated by both the experienced sonar operators and the proposed algorithm. The results obtained were very satisfactory for RPM detection and are detailed at the end of this document.

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

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.