Evaluating Agricultural Sustainability in Tropical Watersheds: An Integrated Geographical Approach

Dante Margate,John Bavor 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Switching dynamics analysis based on Landau-Euler model in the multi-domain doped HfO₂ ferroelectric thin films

Dante Ahn,Yoseop Lee,Seunghyeon Hong,Jungkyu Yoon,Seung-Eon Ahn 한국진공학회 2019 한국진공학회 학술발표회초록집 Vol.2019 No.8

Pseudarthrosis of the Cervical Spine: Risk Factors, Diagnosis and Management

Dante Leven,Samuel K. Cho 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.4

Cervical myelopathy and radiculopathy are common pathologies that often improve with spinal decompression and fusion. Postoperative complications include pseudarthrosis, which can be challenging to diagnose and manage. We reviewed the literature with regard to risk factors, diagnosis, controversies, and management of cervical pseudarthrosis.

Fragility Assessment of Bridges Considering Cumulative Damage Caused by Seismic Loading

Dante Tolentino,Sergio Márquez-Domínguez,J. Ramon Gaxiola-Camacho 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.2

In this paper, an approach is proposed to obtain fragility curves of reinforced concrete structures which can accumulate damage due to inelastic behavior when they are exposed to seismic load sequences in a given instant of time. The cumulative damage caused by earthquakes is quantified considering the maximum drift. This study is mainly focused on the stochastic uncertainty and variability of seismic occurrence, which are considered the main sources that can influence the performance of the structural system. The approach is validated with the help of a numerical study using a reinforced concrete continuous bridge considering the effect of cumulative damage given by seismic sequences for different time instants of 0, 50, 100, 150 and 200 years, after bridge construction. The bridge is located in the transition part of the soil in Mexico City. Different drift thresholds are studied to evaluate the probability of being exceeded. The proposed approach demonstrates the importance of considering the effect of cumulative damage under seismic sequences. In addition, it is assumed that it could be possible to design bridge structures that develop a certain pre-established drift threshold.

Evaluation of structural reliability for reinforced concrete buildings considering the effect of corrosion

Dante Tolentino,Carlos A. Carrillo-Bueno 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4

An approach to evaluate the structural reliability taking into account the degradation of the structural capacity due to corrosion ofreinforced concrete buildings at the end of a time interval is proposed. The structural reliability is expressed in terms of theconfidence factor, within a Demand and Capacity Factor Design format (DCFD). A new closed-form mathematical expression thatconsiders the non-linear structural capacity degradation due to corrosion by means of a second degree polynomial function isdeveloped. The confidence factors are obtained under the assumption that the structural capacity degradation due to corrosionfollows a linear and non-linear function over a time interval. The structural reliability is obtained for a three-story reinforced concretebuilding subjected to two sets of real seismic ground motions recorded in Acapulco Bay Mexico. Both, aleatory and epistemicuncertainties are taken into account into the analysis. A maximum difference of 3.5% between both functions after 83 years from theconstruction of the building was found.

Characterization and Screening of Plant Probiotic Traits of Bacteria Isolated from Rice Seeds Cultivated in Argentina

Dante Ruiza,Betina Agaras,Patrice de Werrab,Luis G. Wall,Claudio Valverde 한국미생물학회 2011 The journal of microbiology Vol.49 No.6

Many seeds carry endophytes, which ensure good chances of seedling colonization. In this work, we have studied the seed-borne bacterial flora of rice varieties cultivated in the northeast of Argentina. Surface-sterilized husked seeds of the rice cultivars CT6919, El Paso 144, CAMBA, and IRGA 417 contained an average of 5×106 CFU/g of mesophilic and copiotrophic bacteria. Microbiological, physiological, and molecular characterization of a set of 39 fast-growing isolates from the CT6919 seeds revealed an important diversity of seed-borne mesophiles and potential plant probiotic activities, including diazotrophy and antagonism of fungal pathogens. In fact, the seed-borne bacterial flora protected the rice seedlings against Curvularia sp. infection. The root colonization pattern of 2 Pantoea isolates from the seeds was studied by fluorescence microscopy of the inoculated axenic rice seedlings. Both isolates strongly colonized the site of emergence of the lateral roots and lenticels, which may represent the entry sites for endophytic spreading. These findings suggest that rice plants allow grain colonization by bacterial species that may act as natural biofertilizers and bioprotectives early from seed germination.

Delito Juvenil y Politicas Sociales

Dante Jeremias Boga 한국라틴아메리카학회 2019 라틴아메리카연구 Vol.32 No.1

The present study provides analysis of the policies that are being carried out with respect to children, in conflict with the penal law as it pertains to the context of confinement, and specifically those laws pertaining to vocational education and training. For this purpose, it is necessary to begin the first section with an overview of the policy transformations that have been carried out in Argentina, and specifically, in the situation of its application in the province of Buenos Aires, which have resulted in the movement of the doctrine from a state of irregularity, to one in which the rights of children are being protected and their interests are being promoted. In the second section, analysis is provided of the theory of human capital, which is the foundational concept for providing training in the context of confinement. In the third section, empirical data is provided in order to characterize the social and family profiles of the youths who are part of the institution of incarceration, as well as the functionality of the educational methods that are proposed. In the final section, five points are postulated which are considered indispensable to (re)formulate the design of the social policies for this social sector.

An Asian Airline Implementation of Smartphone Collaboration : From Training to Operations

Dante Dionne,Douglas M. Schutz,Yong-Young Kim 한국융합학회 2018 한국융합학회논문지 Vol.9 No.10

공항에서 품질 높은 서비스를 제공하기 위해 항공사 직원들은 신속하고 효과적으로 지식을 개발하여 공유하여야 한다. 본 연구는 항공사에서 스마트폰을 이용한 협업의 효과를 검증하기 위하여 적응적 구조화 이론과 미디어 일치성 이론 에 근거하여 사회적 상호작용, 미디어 일치성, 생산적 산출물로 이어지는 이론적 프레이워크를 개발하였다. 아시아에 거점 을 둔 항공사A를 대상으로 훈련 및 운영 기간 동안 33명 인력으로부터 S사에서 제작한 10대의 스마트폰을 이용해 대화한 내용이 담긴 6개월간의 음성 파일을 수집하였다. 근거이론 방법에 기초하여 이론적 프레임워크에 따라 훈련 기간과 운영 기간으로 나눠 이 음성 파일을 분류했다. 정성적・정량적 콘텐트 분석에 기반을 둔 훈련 기간과 운영 기간 간 차이 분석 결과, 사회적 상호작용 단계에서는 갈등 관리에서 업무 관리로, 미디어 일치성 단계에서는 품질에서 양으로, 생산적 산출물 단계에서는 효율에서 몰입으로 주요한 전환이 발생하였다는 점을 발견하였다. 이러한 결과는 항공사 현업 인력들이 훈련 기간 스마트폰 기능의 학습에 중점을 두는 반면, 운영 기간 스마트폰을 활용하여 지식 관리를 수행한다는 점을 시사한다. In order to provide quality services across international airports, airline personnel must rapidly and effectively develop and share knowledge. Combining components of adaptive structuration theory (AST) and media synchronicity theory (MST), a research framework was developed to convey three distinct stages of knowledge sharing. We use the grounded theory research method for the qualitative data collected from audio transcripts of employees learning how to use and work with company issued smartphones with push-to-talk functionalities. Data was collected from 33 operations personnel. The results of the content analysis are recorded for the elements of each of the three concepts of our research framework. During the social interaction stage, the content of the audio conversations shifts mainly from conflict management to task management; for media synchronicity, from quality to quantity; for productive outcomes, from efficiency to commitment. New insights are uncovered from our analysis of data from the field as users advance from learning how to use the mobile devices, to using the devices for managing knowledge for their work in the airline industry.

BEATRICE

Alighieri, Dante,권천홍 한국외국어대학 학도호국단 1973 외대 Vol.8 No.1

Field Measurements for the Effectiveness of Compaction of Coarse-grained Soils

김규선,Dante Fratta,Haifang Wen 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.2

Most earthwork construction specifications recommend a lift thickness of 0.2 m for subgrade soils during road construction. Theselimits were originally implemented to ensure uniform compaction across the entire depth of the soil lifts. However, it has also beenargued that the larger footprints and weight available in modern compaction equipment could potentially compact thicker layerswithout sacrificing the mechanical performance of subbases. This paper describes a field study on the effects of the lift thickness andcompactors on the quality of compacted subbases. The effectiveness of two compactors was evaluated on coarse-grained soils. Different types of geotechnical instruments were used to determine variations in the mechanical properties of soils under appliedcompaction energy. The main goal was to combine the information of different testing types to determine whether it is possible to usea thicker lift of coarse-grained subgrade soils during compaction. The field test results show that compaction energy propagates up tothe 0.3-m depth into the soil lift. Therefore, the conventional 0.2-m lift thickness specification for road construction may be updatedto potentially save construction costs without compromising mechanical performance.