The Experience of Miners Relocated to Alternative Positions due to Silicosis in the Andean of CODELCO, Chile, 2010

Delgado, Diemen,Aguilera, Maria De Los Angeles,Delgado, Fabian,Rug, Ani Occupational Safety and Health Research Institute 2012 Safety and health at work Vol.3 No.2

Objectives: To understand the personal experiences of mine workers that have experienced job relocation due to silicosis at the Andina Division of Corporaci$\acute{o}$n Nacional del Cobre (CODELCO), Chile. The purpose of the study was to provide useful information for the development of new local, business and public policies for the care of workers with silicosis. Methods: A qualitative study based on a practical case study of 5 workers. The information was collected by means of structured individual interviews. The method of analysis was phenomenology. Results: The corporal axis was the most commented upon. It included awareness of the illness, body pains, fatigue, and antagonistic mood disorders (sadness, or the difficulty in finding meaning in life). As far as personal relationships, there was evidence of strong relationships with family, coworkers and friends, as well as extended family. Over all, the experience of relocation was positive with periods of impatience and uncertainty. The job reassignment provided a new and pleasant context for the relocated workers and in the process improved their perception of their quality of life. Conclusions: A multidisciplinary team should attend mine workers relocated because of silicosis by addressing the mental and physical aspects of their disease, along with the integral participation of close family members. It is suggested that this investigation be maintain over time to record the personal experiences in the medium-term, adding new cases with the intention of shedding more light on the phenomenon being studied. As a preventive measure, continual workshops are needed on the proper use of respiratory protection in addition, a group of monitors is required.

Influence of the Oxide Content in the Catalytic Power of Raney Nickel in Hydrogen Generation

Delgado, Dario,Minakshi, Manickam,Kim, Dong-Jin,Kyeong W, Chung Taylor Francis 2017 Analytical letters Vol.50 No.15

Practical high curvature path planning algorithm in joint space

Delgado, Raimarius,Byoung Wook Choi IET 2015 Electronics letters Vol.51 No.6

<P>A practical high curvature path planning algorithm that considers the velocity limit of a mobile robot in joint space is proposed. The existence of obstacles that constrict the smooth movement of mobile robots is inevitable. To avoid incoming collision, the robot is redirected to a new path with respect to the dimensions of the obstacle and a safety factor. The redirected path consists of geometric constraints such as high curvatures on its turning points which cause difficulty in controlling the mobile robot. Thus, a central velocity generation method that considers both velocity limits through a convolution operator and high curvatures at turning points is suggested. The central velocity is able to be within the configured velocity limit, otherwise actual velocity commands in joint space could result. Therefore, interpolation to obtain uniform sampling and velocity downscaling is performed to generate a feasible joint space trajectory. The result shows short travelling time compared with previous methods while satisfying velocity limits in the joint space.</P>

Development of microporous-activated carbons derived from two renewable precursors for CO2 capture

Gomez-Delgado E.,Nunell G. V.,Cukierman A. L.,Bonelli P. R. 한국탄소학회 2020 Carbon Letters Vol.30 No.2

Wood sawdust from an invasive arboreal species, Parkinsonia aculeata, and seeds from a tropical fruit of massive consump�tion, Pouteria sapota, were used as precursors for the development of activated carbons (ACs) directed to CO2 adsorption. Chemical activation employing KOH as activating agent and pre-established experimental conditions was applied. Main physicochemical properties of the ACs in relation to their CO2 adsorption performance were examined. The ACs developed from the wood sawdust and the seeds presented specifc surfaces areas of 770 and 1000 m2 g−1, respectively, with their porosity development resulting essentially microporous (< 2 nm). They also showed a similar content of acidic surface groups, but basic functionalities of the former duplicated those of the latter. Maximum CO2 adsorbed at equilibrium (273 K and 100 kPa) was 5.0 mmol g−1 and 4.4 mmol g−1 for the samples derived from the sawdust and the seeds, respectively. On the other hand, CO2 adsorption capacities mimicking post-combustion conditions, as evaluated from thermogravimetric assays and breakthrough curves obtained in a packed-bed column, were approximately 1 mmol g−1, indicating a good CO2 adsorption performance for both ACs. Nevertheless, those derived from the wood sawdust with a notorious preeminence of micropores (~ 93%), narrower pore size distribution centered around 1 nm, and a higher content of basic functionalities than the ACs obtained from the seeds showed a relatively better performance. The CO2 removal capacity of the activated carbons was not noticeably afecte

Identification of Eligible Studies

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

RTSP를 이용한 임베디드 하드웨어 기반 동시 방송 시스템 개발

Raimarius Delgado,이승형(Seung-Hyung Lee),안병덕(Byung-Dug Ahn),최병욱(Byoung Wook Choi) 한국지능시스템학회 2018 한국지능시스템학회논문지 Vol.28 No.4

자연 재해의 증가는 다양한 방식으로 우리의 생활 방식을 변화시키고 있다. 본 논문에서는 이러한 재난 상황에서 경보에 사용될 수 있는 임베디드 플랫폼 기반의 오디오 동시 방송 시스템을 구현하였다. 이 시스템은 네트워크에 연결된 여러 클라이언트에 오디오 신호를 전송하는 서버로 구성된다. 실제 미디어 전달은 실시간 전송 프로토콜인 RTSP(real-time streaming protocol)에 캡슐화 된 실시간 프로토콜 RTP(real-time protocol) 스트림 개념을 사용하여 구현되어 미디어 전송을 제어하고 각 구성 요소 간의 데이터 전송을 보장한다. 서버 및 클라이언트는 하드웨어 오디오 코덱을 포함한 임베디드 플랫폼으로 개발되었다. ALSA(Advanced Linux Sound Architecture)를 사용하는 장치 드라이버는 하드웨어 코덱을 구동하고 아날로그 오디오 신호와 디지털 신호의 변환을 위하여 개발되었다. 오픈 소스 라이브러리는 서버와 클라이언트에서 구현되어 RTSP와 RTP를 이용한 데이터 교환을 지원한다. 임베디드 환경에서 뮤 법칙 알고리즘을 사용하여 전송 손실과 딜레이를 해결하였고, 유니캐스트 및 멀티캐스트 스트리밍 방식으로 개발된 시스템의 실용성을 검증하는 실험을 수행하였다. Increasing occurrence of natural disasters lead to changes in our lifestyle in various ways. This paper presents a simultaneous audio broadcasting system based on an embedded platform that can be used in disaster warning applications. The system consist of a server that streams audio signals to different clients connected within a network. The actual media delivery is implemented using real-time protocol (RTP) stream concept encapsulated into real-time streaming protocol (RTSP) to control media transmission and ensure transmission of data between each component. We develop embedded platforms, with attached hardware audio codec, as streaming server and clients. Device driver using Advanced Linux Sound Architecture (ALSA) is developed to operate the hardware codecs and convert analog audio signals to digital signals and vice versa. Open source libraries are implemented in the server and clients to support data exchange using RTSP and RTP. Transmission loss and delay were solved in the embedded environment using μ-law. Experiments are performed in unicast and multicast streaming to validate the practicality of the developed system.

Reconstruction methodology of a Francis runner blade using numerical tools

Giovanni Delgado,Sergio Galván,Francisco Dominguez-Mota,J. C. García,Esteban Valencia 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.3

In a hydraulic turbine, the search of a better energy exchange with the fluid has led to designs of runner blade of geometrical shapes so complex that they are considered as free-form surfaces. Since such blade characteristics are unable to be expressed by analytic functions, its complete and realistic geometrical reconstruction requires an excessive quantity of design parameters. This study proposes a coherent and robust full 3D blade numerical reconstruction methodology in which the geometrical definition of the blade is independent of its design parameters. A quantitative and qualitative fit evaluation shows that the blade surface reconstruction needs an important quantity of discrete data along the spanwise and streamwise direction to achieve a continuous and smooth definition. The results infer that the shape characteristics of damaged and worn blades without an original CAD model could be recovered, making this methodology attractive for industrial and optimization applications.

Exotic animal diseases

Joao Delgado 한국토양비료학회 2014 한국토양비료학회 세미나 Vol.2014 No.8

Role of crystallinity on the thermal and viscous behaviour of polyethylene glycol-in-silicone oil (o/o) phase change emulsions

Clara Delgado-Sánchez,Pedro Partal,María José Martín-Alfonso,Francisco Javier Navarro 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

Stable polyethylene glycol-in-silicone oil phase change emulsions were successfully prepared with aselected silicone surfactant. These oil-in-oil (o/o) emulsions have been scarcely examined up, despitethe highly remarkable properties of both phases for energy recovery applications and cosmetic/pharmaceuticalcompositions. The objective of the present work was to study the effect of composition (surfactantand disperse phase concentrations) and the post-processing conditions (further agitation at theprocessing temperature for 24 h) on the final features of the emulsion. For this purpose, optical morphology,thermo-physical and the rheological behaviour of the emulsions and binary blends of their compoundswere measured and analysed. Special attention has been paid to structural changes andcrystallinity modifications of the emulsion disperse phase. The observed miscibility of the silicone surfactantand silicone chains with the disperse phase reduces its crystallinity degree and modifies in the crystallizationmechanism of the polyethylene glycol, from heterogeneous to homogeneous nucleation. Interestingly, the change in the disperse phase crystallinity remarkably modifies final thermal and rheologicalproperties of the emulsion.

A Probabilistic Analysis for Periodicity of Real-time Tasks

Raimarius Delgado,Byoung Wook Choi 한국인터넷방송통신학회 2021 International Journal of Internet, Broadcasting an Vol.13 No.1

This paper proposes a probabilistic method in analyzing timing measurements to determine the periodicity of real-time tasks. The proposed method fills a gap in existing techniques, which either concentrate on the estimation of worst-case execution times, or do not consider the stochastic behavior of the real-time scheduler. Our method is based on the Z-test statistical analysis which calculates the probability of the measured period to fall within a user-defined standard deviation limit. The distribution of the measured period should satisfy two conditions: its center (statistical mean) should be equal to the scheduled period of the real-time task, and that it should be symmetrical with most of the samples focused on the center. To ensure that these requirements are met, a data adjustment process, which omits any outliers in the expense of accuracy, is presented. Then, the Z-score of the distribution according to the user-defined deviation limit provides a probability which determines the periodicity of the real-time task. Experiments are conducted to analyze the timing measurements of real-time tasks based on real-time Linux extensions of Xenomai and RT-Preempt. The results indicate that the proposed method is able to provide easier interpretation of the periodicity of real-time tasks which are valuable especially in comparing the performance of various real-time systems.