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Guillem Quintana,Thomas Rudolf,Joaquim Ciuran,Christian Brecher 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
In this paper, the average surface roughness parameter (Ra) is predicted using artificial neural network (ANN) models and internal kernel information and external piezoelectric accelerometer data. Experiments were conducted to obtain data to develop ANN models to predict surface roughness. A total of 72 samples were used to develop two networks, one based on accelerometer inputs and the other on kernel inputs. The Matlab ANN Toolbox was used for the modeling. The two networks had similar characteristics. Feed-forward backpropagation,‘newff’, was the network structure selected, with a Levenberg-Marquardt backpropagation training function, ‘trainlm’, and a backpropagation weight and bias learning function, ‘learngdm’. Samples obtained at the experimental stage were randomly divided into three groups to train (70% of the samples), validate (15% of the samples) and test (15% of the samples) the neural networks with a 'dividerand'data division function. The input processing functions used were 'fixunknowns', 'removeconstantrows' and 'mapminmax'. The transfer function was 'tansig' for hidden layers and 'purelin' for the output layer. The output processing functions used were 'removeconstantrows'and 'mapminmax'. The inputs consisted of the process parameters of radial depth of cut (Ae), the axial depth of cut (Ap), the spindle speed (N), the feed rate (f), the feed per tooth (fz), the cutting speed (Vc), the tooth passing frequency (ft), the cutting section (Cs),the material removal rate (MRR) and the cutting tool characteristics of the cutter radius (R), the number of teeth (Z) and the tool shape. The main difference between the two neural networks consisted of data origin: one considered data obtained with accelerometers and the other data collected in the NC kernel. Results showing high correlation factors between outputs and targets confirm that data provided by both internal and external sources can be useful for Ra prediction. However, NC kernel data provide several advantages.
LAS RELACIONES COMERCIALES MEXICO-ESTADOS UNIDOS ANTE EL TLCAN: UN ENFOQUE NEOINSTITUCLONAL
Luis Quintana Romero 한국외국어대학교 중남미연구소 2005 중남미연구 Vol.24 No.1
This paper draws a balance sheet of the mexican institutions created to implement the North American Free Trade Agreement (NAFTA), examining their effectiviness and their performance as supranational bodies and mechanisms. NAFTA’s institutions are considered as part of the broad process of institutional reforms begun in the 1980s as a result of the mexican trade opening. In that sense, the agreement is analyzed as a specific source of institutional change, particularly in it’s domestic dimension, where it has been behind modifications in the obligatory nature of Mexico´s legal system. While under NAFTA important changes in the mexican legal system have been made formally, in practice, problems persist. These affect the quality of the institutions, problems like corruption, low competitiveness, informal market, drug trafficking, contraband and poverty.
Algunas Lecciones de la Evaluaci? del Tratado de Libre Comercio de Am?ica del Norte
Luis Quintana Romero, Nam Kwon Mun 한국외국어대학교 중남미연구소 2007 중남미연구 Vol.25 No.2
North American Free Trade Agreement is one of the most debated economic integration among trade blocs of the world. This FTA established for the first time in the economic integration history the vertical integration model. So there have been so many reviews about the economic effect of this trade bloc. Many analysis estimatesas positive the economic performance of the intra-bloc countries since it entered into effect. But the meaning of the positive valuation should be different for each nation of the bloc.This paper reviews the proper economy theory for NAFTA, and judges the performance of the FTA for the small country of the bloc, Mexico.
Fernando Ramos-Quintana,Victor Hugo Zarate-Silva,Juan Alvarez 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2005 International Journal of Assistive Robotics and Me Vol.6 No.2
This paper describes an initiative to introduce mechanisms oriented to create motivational attitudes for developing applied research in the undergraduate level, instead of focusing such efforts only in the graduate level. An important part of these efforts are carried out under the framework of several robotics projects, in particular walking robots and simulated and real soccer robots. Along with this, a curriculum to assure long term technical goals has been specially designed. Thus, the projects should provide the necessary ingredients to encourage the students to develop autonomous behaviors and maintain persistent motivational attitudes by interacting with attractive technical challenges.<BR> We have adopted formal learning models that help to develop cognitive skills for solving problems, such as Problem Based Learning (PBL). In a first step, during four semesters of the years 2002 and 2003, the PBL model, along with projects in soccer robots, has been applied in the undergraduate and graduate level. Since 2004 these efforts have been focused on the undergraduate level. And, we have already witnessed some key results; the students have acquired interesting motivational attitudes in applied research projects in robotics; they have developed cognitive skills for solving problems; and they have got successful participations in international robotics competitions.
García Alfonso de la Quintana 한국마케팅과학회 2023 Journal of Global Fashion Marketing Vol.14 No.4
The cinema is a fashion promoter that has always influenced jour- nalists’ stereotypes. From their clothes, hairstyles, gestures and even the way of speaking. It has been an essential instrument for studying the aesthetic movements through the different eras in history. It also turned the journalist into an opinion leader and, hereinafter, those journalists would influence in their audience by creating style icons through movies and promoting items of cloth- ing. In order to analyse the evolution of cinema fashion in Spain, two representative films of the journalistic profession have been analysed for their screen share acceptance, but very different in time, space and form in order to try to cover all possible character- istics. By means of a comparative study, the similarities, differences and fashion pattern are analysed and summarised. The most impor- tant conclusion is that fashion is a cross-cuing phenomenon that is used to denounce injustice in each of the films. Fashion is not only the costume, it is the way of speaking in the script, the furniture, the place filmed and sometime even the problems that are denounced. Fashion has social effects. Finally, a small, very limited simple is made with a series of in-depth interviews with three journalists in relevant positions, with more than ten years of seniority working in the world fashion.
Convergencia espacial en el crecimiento econ?ico de las entidades federativas de M?ico, 1940-2004.
Asuad San? Normand,Quintana Romero Luis 한국외국어대학교 중남미연구소 2007 중남미연구 Vol.26 No.1
The purpose of this paper is to identify the vidence ofconvergence-divergence clubs into the conomic growth pat tern of theStates of Mexico and to ases the role and importance of the g eo-spatialfactors in that proces. This paper uses an econometric spatial cros-sectionmodel in order to analyze the conomic growth and the converg encehypothesis.324 중남미 연구 제 권 호26 1The results confirm the xistence of diferent convergence proces in theStates of Mexico and the conformation of convergence clubs with diversesteady-state. This ituation keps the income disparity in the conomicdevelopment of the states and revealed the close relationship betwen thegeo-spatial ocalization and the formation of convergence nucleus in theMexican States.