Computational fluid dynamic modeling of the flame spray pyrolysis process for silica nanopowder synthesis

Olivas-Martinez, Miguel,Sohn, Hong Yong,Jang, Hee Dong,Rhee, Kang-In Springer-Verlag 2015 JOURNAL OF NANOPARTICLE RESEARCH Vol.17 No.7

Integrated management of the coffee berry borer: A comparison of cultural, biological, and ethological control

Oliva Manuel,Rubio Karol,Rivasplata Elder,Leiva Santos 한국곤충학회 2020 Entomological Research Vol.50 No.11

The coffee berry borer (CBB) is among the most harmful pests to coffee crops across the world, causing enormous harm to small‐ scale coffee farmers in northern Peru. This study aimed to contrast three different CBB control methods; cultural control (field sanitation), ethological control (red traps baited with ethanol–methanol (1:1)), biological control (use of the Beauveria sp., strain) and an integration of the aforementioned methods by comparing each control method’s efficiencies and CBB reduction percentage in coffee plantations located in the province of Rodriguez de Mendoza, Amazonas. Therefore, a completely randomized block design (CRBD) was applied. Subsequently, the results showed no statistical differences among treatments carried out in this study. However, high infestation reduction percentages of up to 70% were reached, evidencing the effect of these treatments. In addition, the final results were impacted by environmental conditions and population pressure.

Quantitative Performance Analysis of Machine Learning Algorithms Applied to Computational Fluid Dynamic Simulation of Indoor Airflow

Olivas, Ana Claudinne(올리바스 아나 클라우딘),Lee, Changkye(이창계),Yee, Jurng-Jae(이정재) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2

Causes of erythrocytosis and its impact as a risk factor for thrombosis according to etiology: experience in a referral center in Mexico City

Antonio Olivas-Martinez,Eduardo Corona-Rodarte,Adrián Nuñez-Zuno,Olga Barrales-Benítez,Daniel Montante-Montes de Oca,Jesús Delgado-de la Mora,Diana León-Aguilar,Hilda Elizeth Hernández-Juárez,Elena Tu 대한혈액학회 2021 Blood Research Vol.56 No.3

Background Thrombotic events are well documented in primary erythrocytosis, but it is uncertain if secondary etiologies increase the risk of thrombosis. This study aimed to determine the causes of erythrocytosis and to identify its impact as a risk factor for thrombosis. Methods Data were obtained from patients with erythrocytosis between 2000 and 2017 at a referral hospital in Mexico City. Erythrocytosis was defined according to the 2016 WHO classification. Time to thrombosis, major bleeding, or death were compared among groups of patients defined by the etiology of erythrocytosis using a Cox regression model, adjusting for cardiovascular risk factors. Results In total, 330 patients with erythrocytosis were studied. The main etiologies of erythrocytosis were obstructive sleep apnea (OSA) in 29%, polycythemia vera (PV) in 18%, and chronic lung disease (CLD) in 9.4% of the patients. The incidence rate of thrombosis was significantly higher in patients with PV and CLD than that in patients with OSA (incidence rates of 4.51 and 6.24 vs. 1.46 cases per 100 person-years, P=0.009), as well as the mortality rate (mortality rates of 2.72 and 2.43 vs. 0.17 cases per 100 person-years, P=0.003). Conclusion The risk of thrombosis in CLD with erythrocytosis was comparable to that in patients with PV. Further larger-scale studies are needed to confirm these findings and evaluate the benefits of preventive management of COPD with erythrocytosis similar to PV

Direct Labeling of 19F-Perfluorocarbon onto Multilayered Cell Sheet for MRI-Based Non-Invasive Cell Tracking

Joan Oliva,Fawzia Bardag-Gorce,Andrew Wood,Hiroyuki Sota,Yutaka Niihara 한국조직공학과 재생의학회 2015 조직공학과 재생의학 Vol.12 No.5

Autologous stem cell transplantation for eye diseases is immunologically preferable to avoid allograft rejection. However, the fate of the grafted cells has never been studied. Here, we propose to use 19F-perfluorocarbon magnetic resonance imaging tracer agent, to label cell sheet in vitro. This labeling enables non-invasive visualization of possible migration of grafted cells. Oral mucosal epithelial cells were isolated from rabbit oral mucosal epithelium and were cultivated in a thermo-responsive surface to engineer a multilayer cell sheet. Different concentrations of 19F-perfluorocarbon were added to the cell sheet culture media, one or two times. Cells were analyzed in a 7 T nuclear magnetic resonance to determine the labeling efficiency. We found that 10 mg/mL and two incubations with 19F-perfluorocarbon were the optimal condition for labeling. H&E and immunocytochemistry showed that labeling did not affect the expression of cell sheets specific markers (CK4, CK13, connexin43, E-cadherin). Furthermore, no significant effects were observed on the number of cells and the cell viability, making 19F-perfluorocarbon suitable for cell tracking, with no side effects.

Feeder Cells Free Rabbit Oral Mucosa Epithelial Cell Sheet Engineering

Joan Oliva,Ken Ochiai,Arjie Florentino,Fawzia Bardag-Gorce,Andrew Wood,Yutaka Niihara 한국조직공학과 재생의학회 2018 조직공학과 재생의학 Vol.15 No.3

The optimal cell culture method of autologous oral mucosal epithelial cell sheet is not well established for a safe transplantation on to the patients’ ocular surface. Animal serum and 3T3 mouse feeder cells are currently being used to stimulate the growth of the epithelial cells. However, the use of animal compounds can have potential side effects for the patient after transplantation of the engineered cell sheet. In the present study, we focused on engineering a rabbit oral mucosal epithelial cell sheet without 3T3 mouse feeder cells using a mix of Dulbecco’s Modified Eagle Medium/Bronchial Epithelial Cell Growth Medium culture media (DMEM/BEGM). Autologous oral mucosal epithelial cell sheets, engineered with DMEM/BEGM feeder cell free culture media, were compared to those cultured in presence of serum and feeder cells. Using a DMEM/BEGM mix culture media, feeder cell free culture condition, autologous oral mucosal epithelial cells reached confluence and formed a multilayered sheet. The phenotype of engineered cell sheets cultured with DMEM/BEGM were characterized and compared to those cultured with serum and feeder. Hematoxylin and eosin staining showed the formation of a similar stratified multilayer cell sheets, in both culture conditions. The expression of deltaN-p63, ABCG2, PCNA, E-cadherin, Beta-catenin, CK3, CK4, CK13, Muc5AC, was similar in both culture conditions. We demonstrated that rabbit autologous oral mucosal epithelial cell sheet can be engineered, in feeder cell free conditions. The use of the DMEM/BEGM culture media to engineer culture autologous oral mucosa epithelial cell sheet will help to identify key factors involved in the growth and differentiation of oral mucosal epithelial cells.

Localization of networks with presence and distance constraints based on 1-hop and 2-hop mass–spring optimization

Gabriele Oliva,Roberto Setola,Stefano Panzieri,Federica Pascucci 한국통신학회 2016 ICT Express Vol.2 No.1

In this paper we consider the localization of a sensor network where the nodes are heterogeneous, in that some of them are able to measure the distance from their neighbors, while some others are just able to detect their presence, and we provide a post-processing algorithm that can be used to improve an initial estimate for the location of the nodes, based on a mass–spring optimization approach, taking into account presence and distance information, as well as one-hop and two-hop information.

The socket shield technique and its complications, implant survival rate, and clinical outcomes: a systematic review

Stefano Oliva,Mario Capogreco,Giovanna Murmura,Ettore Lupi,Di Carlo Mariachiara,Maurizio D’Amario 대한치주과학회 2023 Journal of Periodontal & Implant Science Vol.53 No.2

Purpose: The aim of this systematic review was to evaluate the effectiveness of the socket shield technique (SST), an innovative surgical method introduced in 2010, for reducing buccal bone plate resorption. Methods: The review was conducted following the PRISMA guidelines. Clinical studies conducted in humans and investigating the SST were searched on PubMed (MEDLINE), Embase, Web of Knowledge, and Google Scholar in November and December 2021. The implant survival rate, percentage of complications, and clinical parameters (marginal bone loss [MBL], pink esthetic score [PES], and buccal bone plate resorption [BBPR]) were analyzed using the collected data. Results: The initial search resulted in 132 articles. After article screening, the full texts of 19 studies were read and 17 articles were finally included in the review. In total, 656 implants were installed with the SST. Nine of the 656 implants experienced failure, resulting in an implant survival rate of 98.6%. The percentage of complications was about 3.81%. The analysis of clinical parameters (MBL, PES, and BBPR), showed favorable results for the SST. The mean MBL in implants placed with the SST was 0.39±0.28 mm versus 1.00±0.55 mm in those placed without the SST. PES had a better outcome in the SST group, with an average of 12.08±1.18 versus 10.77±0.74. BBPR had more favorable results in implants placed with the SST (0.32±0.10 mm) than in implants placed with the standard technique (1.05±0.18 mm). Conclusions: The SST could be considered beneficial for preserving the buccal bone plate. However, since only 7 of the included studies were long-term randomized controlled trials comparing the SST with the standard implant placement technique, the conclusions drawn from this systematic review should be interpreted with caution. Trial Registration: PROSPERO Identifier: CRD42020180637

Comparative Performance Analysis of Machine Learning-based Indoor-Outdoor Airflow Simulation

Ana Claudinne Olivas,Changkye Lee,Jurng-Jae Yee 대한건축학회지회연합회 2023 대한건축학회연합논문집 Vol.25 No.2

This paper discusses the performance of linear regression, regression tree, support vector regression, and ensemble learners in modelling airflow between two spaces based on accuracy and training time. To obtain training data, different scenarios from an existing computational fluid dynamics (CFD) model are simulated via transient analysis using Cradle scSTREAM. The raw dataset is transformed to having time step sizes of 2.5s, 5.0s, and 50.0s. Feature scaling is also employed on the each data set using both min-max scaling and z-score methods for a total of 9 datasets. Hyperparameters according to machine learning (ML) algorithms are varied such that 15 ML models across the four algorithms are developed. The results show that the regression trees perform the best over all other algorithms, with all models maintaining R2 values above 0.95 at the different datasets. On the other hand, as expected, all linear models demonstrated poor performance compared to nonlinear models. Data resolution affects model accuracy and training time, with accuracy declining slightly as time step size increased. It is also found that there is no significant effect of feature scaling. Lastly, ML models yield substantially cheaper simulation costs than CFD to simulate airflow.

TO BUCKLE UP OR NOT BUCKLE UP, THAT IS THE QUESTION: AN EXAMINATION OF THE ETIDCAL DECISION MAKING PROCESS PERTAINING TO SCHOOL BUS RESTRAINT IN THE UNITED STATES

( Suzanne Dapra Oliva ) 제주대학교 법과정책연구소 2015 국제법무 Vol.7 No.2

이 논문은 안전벨트가 미국에서 학교 버스에 필요로 하는지 여부의 윤리적 문제와 관련하여 윤리적 의사 결정 과정에 초점을 맞추고 있다. 원칙과 가치, 사회 문화적 기대, 법적 요구 사항을 포함한 사실을 분석 하였다. 그 결정의 영향은, 이해 관계자, 고도로 경쟁 문제의 현재 상태를 강조하기 위해 행동의 다양한 과정의 결과가 확인되었다. 학생, 또는 학부모, 모두 조합 안전벨트에 찬성이다. 미국의 법률은 보호를 필요로 하는 어린이와 같은 레벨을 포함하여 개인의 권리를 보호하기 위해 통과된다. 이 경우에, 연방 의회는 필수 안전벨트를 필요로 할 것인지 여부를 결정하도록 허용하기로 결정했다. 이 문제를 결정하는 법률을 통과하기 위하여, 각 학교 지구는 그들의 특정한 관할 수요, 예산, 또는 다른 정당성에 기반 하여, 학교 버스에 안전벨트를 필요로 하는 것이 적절한 경우인지를 결정해야 합니다. 모든 비용은 결국 학교 세금의 형태를 통해 성분에 의해 지급됩니다. 그러나 연방 및 주 의회는 이 예산부담을 인식하고 국가 보조금 및 판매 세금 인센티브를 제공하여 완화를 시도하고 있다. 이 문제는 미국에서 학교 버스에 안전벨트의 예를 이용하여 연구되었지만 의사 결정 과정은 외국의 예를 사용 하여 분석 할 수 있다. 궁극적으로, 의사 결정자는 행동의 적절한 코스를 결정 하기 위해 자선의 특정 요구 사항을 분석하여야 한다. This paper will address the ethical decision making process in the United States, focusing on the controversial topic of whether or not lap and shoulder combination seat belts should be required on large school buses. The facts, including principles and values, social or cultural expectations, and legal requirements, were analyzed. Those affected by the decision, the stakeholders, were identified as well as the consequences of the various courses of action in order to highlight the current state of this highly contested issue. Passengers, or their parents, are in favor of combination seat belts. Laws in the United States are passed to protect individual rights, including those in protected classes such as children. In this case, the federal legislature decided to allow each state to determine whether or not to require mandatory seat belts. Since only six states so far have passed laws determining this issue, each school district must then decide if it is proper for their particular jurisdiction to require seat belts on school buses based on demand, budget, or other justification. Any costs will eventually be paid by the constituents through the form of school taxes. However, federal and state legislatures have recognized this burden and attempt to alleviate it by providing state grant funding and sales tax incentives. Although this issue was studied using the example of seat belts on school buses in the U.S., the decision making process could be analyzed using foreign examples as well. Ultimately, decision makers should analyze their particular requirements in order to determine a proper course of action.