배.급수관망에서의 염소이온농도가 관부식에 미치는 영향

Antoun Edward-N,Dyksen John-E 한국상하수도협회 1997 水道 Vol.24 No.4

Robust and Efficient 3D Model of an Electromagnetic Induction (EMI) Sensor

Antoun, Chafic Abu,Perriard, Yves Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3

Eddy current induction is used in a wide range of electronic devices, for example in detection sensors. Due to the advances in computer hardware and software, the need for 3D computation and system comprehension is a requirement to develop and optimize such devices nowadays. Pure theoretical models are mostly limited to special cases. On the other hand, the classical use of commercial Finite Element (FE) electromagnetic 3D models is not computationally efficient and lacks modeling flexibility or robustness. The proposed approach focuses on: (1) implementing theoretical formulations in 3D (FE) model of a detection device as well as (2) an automatic Volumetric Estimation Method (VEM) developed to selectively model the target finite elements. Due to these two approaches, this model is suitable for parametric studies and optimization of the number, location, shape, and size of PCB receivers in order to get the desired target discrimination information preserving high accuracy with tenfold reduction in computation time compared to commercial FE software.

Effects of Radiotherapy on the Risk of Developing Secondary Malignant Neoplasms in Hodgkin's Lymphoma Survivors

Abou-Antoun, Tamara,Mikhael, Rachelle,Massoud, Marcel,Chahine, Georges,Saad, Aline Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2

Extended follow-up of Hodgkin lymphoma (HL) survivors indicates that these patients are at high risk of secondary malignant neoplasms (SMNs) contributing to increased morbidity and mortality. This study examined the characteristics of HL survivors who developed SMNs with the aim to report any correlation with radiotherapy (RT) dose. In this retrospective multi-center cohort study of HL patients treated between 1990 and 2011 at three major teaching hospitals in Lebanon, classification was into two groups including those treated with combined modality (RT and chemotherapy-CHT) and those treated with CHT alone. Approval from the University Institutional Review Board (IRB) was obtained. Of the 112 patients evaluated, 52.7% (59) received the combined modality while 47.3% (53) received CHT alone. There were 6 cases of SMNs in the combined modality cohort and 5 cases in the CHT cohort. The mean RT dose in the combined modality cohort was 34.5 Gray (Gy) ($SD{\pm}5.3$). A statistically significant increase (1.5 fold) in the risk of developing SMNs was observed among patients who received a dose higher than 41 Gy compared to a dose between 20 to 30 Gy (OR= 1.5; 95% confidence interval= 0.674 to 3.339, p=0.012). The risk of SMNs was not significantly higher among patients who received extended field compared to involved field RT (p=0.964). This study showed that the risk of developing SMNs is higher among patients treated with RT dose greater than 31 Gy, independent of the RT type used.

Impact of skeletal divergence on oral health-related quality of life and self-reported jaw function

Joseph Safwat Antoun,William Murray Thomson,Tony Raymond Merriman,Roberto Rongo,Mauro Farella 대한치과교정학회 2017 대한치과교정학회지 Vol.47 No.3

Objective: To investigate the differences in oral health-related quality of life (OHRQoL) and self-reported jaw function between patients with hyperdivergent and normodivergent facial types. Methods: Eighty patients with a distinctively hyperdivergent facial type (mandibular plane angle greater than 2 standard deviations, or 42°) and 80 controls were individually matched according to age, sex, ethnicity, and treatment stage. Data were collected using self-report questionnaires such as the Oral Health Impact Profile (OHIP-14) and Jaw Functional Limitation Scale (JFLS-8). Results: The mean age of the patients was 17.2 ± 4.6 years (range, 12–49 years), with most (65.0%) being female and of New Zealand European origin (91.3%). Individuals with hyperdivergent facial types had higher overall and social domain scores on the OHIP-14 (p < 0.05) than did the ones with normodivergent facial types. However, the intergroup differences in JFLS-8 scores were not significant (p > 0.05). Conclusions: Jaw function appears to be similar in individuals with hyperdivergent and normodivergent facial morphologies. However, those with hyperdivergent facial types are more likely to self-report poorer OHRQoL than are those with normal faces, especially in relation to social aspects.

The use of auxiliary devices during irrigation to increase the cleaning ability of a chelating agent

Marina Carvalho Prado,Renata Antoun Simão,Fernanda Leal,Heloisa Gusman,Maíra do Prado 대한치과보존학회 2017 Restorative Dentistry & Endodontics Vol.42 No.2

Objectives: This study investigated the cleaning ability of ultrasonically activated irrigation (UAI) and a novel activation system with reciprocating motion (EC, EasyClean, Easy Equipamentos Odontológicos) when used with a relatively new chelating agent (QMix, Dentsply). In addition, the effect of QMix solution when used for a shorter (1 minute) and a longer application time (3 minutes) was investigated. Materials and Methods: Fifty permanent human teeth were prepared with K3 rotary system and 6% sodium hypochlorite. Samples were randomly assigned to five groups (n = 10) according to the final irrigation protocol: G1, negative control (distilled water); G2, positive control (QMix 1 minute); G3, QMix 1 minute/UAI; G4, QMix 1 minute/EC; G5, QMix 3 minutes. Subsequently the teeth were prepared and three photomicrographs were obtained in each root third of root walls, by scanning electron microscopy. Two blinded and pre-calibrated examiners evaluated the images using a four-category scoring system. Data were statistically analyzed using Kruskal-Wallis and Dunn tests (p < 0.05). Results: There were differences among groups (p < 0.05). UAI showed better cleaning ability than EC (p < 0.05). There were improvements when QMix was used with auxiliary devices in comparison with conventional irrigation (p < 0.05). Conventional irrigation for 3 minutes presented significantly better results than its use for 1 minute (p < 0.05). Conclusions: QMix should be used for 1 minute when it is used with UAI, since this final irrigation protocol showed the best performance and also allowed clinical optimization of this procedure.

Outcome of Breast Cancer Screening: A Lebanese Single Institution Experience

Kourie, Hampig Raphael,Daher, Alain,Matar, Dany,Antoun, Joelle,Salloum, Lony,Kattan, Joseph Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.21

Background: Since 2002, from October till December of each year, the Lebanese Ministry of Public Health conducts a mammogram based breast cancer screening campaign in the whole country for women over 40 years of age. These mammograms are performed free of charge in governmental hospitals or for reduced fees in private hospitals. The aim of this study is to analyze the direct impact of this campaign on cancer detection and subsequent treatment. Materials and Methods: Radiologic records of women screened with a mammogram during the campaign period from October till December 2012 at Saint Joseph Hospital, Baouchrieh, Beirut, were reviewed. Results of mammograms were reported using the ACR score. Women with ACR score ${\geq}4$ were tracked and investigated. Results: 900 screening mammograms were performed; median age was 55.2 years (range:31-81 years). Some 826 (91.8%) had an ACR score of ${\leq}2$; 66 (7.3%) an ACR =3 and only 8 (0.89%) an ACR=4. Thus, less than 1% (8/900) of all screened women were considered at high risk and needed a close follow-up. Among these 8 women, 4 underwent surgery for an early breast cancer, one had synchronous metastatic breast cancer and two were lost to follow-up. Conclusions: To coclude, Among 900-screened women for BC, less than 1 % (8 out of 900) were at high risk of hiding a BC (ACR=4), half of them benefited from early therapy (4 women out of 900) and one was a false positive. Larger studies on national level should be accomplished to have a complete data on breast cancer screening in Lebanon. The results of these studies can affect the Lebanese health policy regarding BC.

The use of auxiliary devices during irrigation to increase the cleaning ability of a chelating agent

Prado, Marina Carvalho,Leal, Fernanda,Simao, Renata Antoun,Gusman, Heloisa,do Prado, Maira The Korean Academy of Conservative Dentistry 2017 Restorative Dentistry & Endodontics Vol.42 No.2

Objectives: This study investigated the cleaning ability of ultrasonically activated irrigation (UAI) and a novel activation system with reciprocating motion (EC, EasyClean, Easy Equipamentos $Odontol\acute{o}gicos$) when used with a relatively new chelating agent (QMix, Dentsply). In addition, the effect of QMix solution when used for a shorter (1 minute) and a longer application time (3 minutes) was investigated. Materials and Methods: Fifty permanent human teeth were prepared with K3 rotary system and 6% sodium hypochlorite. Samples were randomly assigned to five groups (n = 10) according to the final irrigation protocol: G1, negative control (distilled water); G2, positive control (QMix 1 minute); G3, QMix 1 minute/UAI; G4, QMix 1 minute/EC; G5, QMix 3 minutes. Subsequently the teeth were prepared and three photomicrographs were obtained in each root third of root walls, by scanning electron microscopy. Two blinded and pre-calibrated examiners evaluated the images using a four-category scoring system. Data were statistically analyzed using Kruskal-Wallis and Dunn tests (p < 0.05). Results: There were differences among groups (p < 0.05). UAI showed better cleaning ability than EC (p < 0.05). There were improvements when QMix was used with auxiliary devices in comparison with conventional irrigation (p < 0.05). Conventional irrigation for 3 minutes presented significantly better results than its use for 1 minute (p < 0.05). Conclusions: QMix should be used for 1 minute when it is used with UAI, since this final irrigation protocol showed the best performance and also allowed clinical optimization of this procedure.

Liquid Crystal Polymers (X). Synthesis and Properties of New Thermotropic Main Chain Copolyesters with Either Mixed Polymethylene Spacers or Mixed Mesogenic Units

Jung-Il Jin,Robert W. Lenz,S. Antoun Korean Chemical Society 1982 대한화학회지 Vol.26 No.3

새로운 혼성 폴리에스테르 4가지를 합성하여 액정성을 DSC 및 편광 현미경을 사용하여 조사, 연구하였다. 세가지 혼성 폴리에스테르는 같은 메소젠 단위를 갖고 있으나 폴리메틸렌 유연 격자중 메틸렌기 수가 기수-우수, 기수-기수 및 우수-우수의 조합으로 되어 있는점이 다르며, 또 하나의 혼성 폴리에스테르는 양단에 p-옥시벤조일기가 결합하고 있는 메틸-및 브로모히드로 퀴논 단위가 데카메틸렌 격자에 결합하고 있는 구조를 갖고 있다. 이들 폴리에스테르는 모두 녹는점 및 그 이상의 온도에서 네마틱 액정상을 형성함을 알았으며 네마틱${\to}$등방성 액체간의 상변환이 가역적으로 일어남을 DSC 및 현미경으로 관찰할 수 있었다. 액정${\to}$등방성액체의 상변환에 수반되는 열역학적 성질을 중합체의 구조와 관련시켜 고찰하였다. Four new thermotropic copolyesters were prepared and their liquid crystal properties were investigated by differential scanning calorimetry and on a hot-stage of a polarizing microscope. Three copolyesters had same mesogenic unit, triad aromatic ester structure, interconnected through a random combination of either odd-even, or odd-odd, or even-even number of methylene groups in the polymethylene flexible spacers. Another random copolyester consisted of mesogenic units of 1 : 1 mixture of central methyl-and bromohydroquinone moieties with two flanking p-oxybenzoate units connected by decamethylene spacer. All of the polyesters formed nematic liquid crystal phase upon melting. The transitions for melting and nematic ${\to}$ isotropic transformations could be reversibly observed by DSC as well as by microscopic study. The thermodynamic properties for their liquid crystal ${\to}$ isotropic phase transitions were discussed in relation to their chemical structures.

The effects of non-thermal plasma and conventional treatments on the bond strength of fiber posts to resin cement

Maíra do Prado,Eduardo Moreira da Silva,Juliana das Neves Marques,Caroline Brum Gonzalez,Renata Antoun Simão 대한치과보존학회 2017 Restorative Dentistry & Endodontics Vol.42 No.2

This study compared the effect of hexamethyldisiloxane (HMDSO) and ammonia (NH3) plasmas on the bond strength of resin cement to fiber posts with conventional treatments. Materials and Methods: Sixty-five fiber posts were divided into 5 groups: Control (no surface treatment); H2O2 (24% hydrogen peroxide for 1 min); Blasting (blasting with aluminum oxide for 30 sec); NH3 (NH3 plasma treatment for 3 min); HMDSO (HMDSO plasma treatment for 15 min). After the treatments, the Ambar adhesive (FGM Dental Products) was applied to the post surface (n = 10). The fiber post was inserted into a silicon matrix that was filled with the conventional resin cement Allcem Core (FGM). Afterwards, the post/cement specimens were cut into discs and subjected to a push-out bond strength (POBS) test. Additionally, 3 posts in each group were evaluated using scanning electron microscopy. The POBS data were analyzed by one-way analysis of variance and the Tukey’s honest significant difference post hoc test (α = 0.05). Results: The Blasting and NH3 groups showed the highest POBS values. The HMDSO group showed intermediate POBS values, whereas the Control and H2O2 groups showed the lowest POBS values. Conclusion: Blasting and NH3 plasma treatments were associated with stronger bonding of the conventional resin cement Allcem to fiber posts, in a procedure in which the Ambar adhesive was used.

The effects of non-thermal plasma and conventional treatments on the bond strength of fiber posts to resin cement

do Prado, Maira,da Silva, Eduardo Moreira,Marques, Juliana das Neves,Gonzalez, Caroline Brum,Simao, Renata Antoun The Korean Academy of Conservative Dentistry 2017 Restorative Dentistry & Endodontics Vol.42 No.2

Objectives: This study compared the effect of hexamethyldisiloxane (HMDSO) and ammonia ($NH_3$) plasmas on the bond strength of resin cement to fiber posts with conventional treatments. Materials and Methods: Sixty-five fiber posts were divided into 5 groups: Control (no surface treatment); $H_2O_2$ (24% hydrogen peroxide for 1 min); Blasting (blasting with aluminum oxide for 30 sec); $NH_3$ ($NH_3$ plasma treatment for 3 min); HMDSO (HMDSO plasma treatment for 15 min). After the treatments, the Ambar adhesive (FGM Dental Products) was applied to the post surface (n = 10). The fiber post was inserted into a silicon matrix that was filled with the conventional resin cement Allcem Core (FGM). Afterwards, the post/cement specimens were cut into discs and subjected to a push-out bond strength (POBS) test. Additionally, 3 posts in each group were evaluated using scanning electron microscopy. The POBS data were analyzed by one-way analysis of variance and the Tukey's honest significant difference post hoc test (${\alpha}=0.05$). Results: The Blasting and $NH_3$ groups showed the highest POBS values. The HMDSO group showed intermediate POBS values, whereas the Control and $H_2O_2$ groups showed the lowest POBS values. Conclusion: Blasting and $NH_3$ plasma treatments were associated with stronger bonding of the conventional resin cement Allcem to fiber posts, in a procedure in which the Ambar adhesive was used.