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David Rosenbaum-Halevi,Victor Lopez-Rivera,Ali Turkmani,Aditya Sanzgiri,Hussein A. Zeineddine,Amber Luong,Peng Roc Chen 대한뇌혈관외과학회 2020 Journal of Cerebrovascular and Endovascular Neuros Vol.22 No.2
Intra-arterial embolization of juvenile nasopharyngeal angiofibroma (JNA) prior to surgical resection is the preferred approach to minimize blood loss during surgical resection of the tumor. However, the presence of external carotid artery–internal carotid artery (ECA-ICA) anastomoses may hinder complete tumor embolization due to the associated risk for embolic complications. Here, we evaluate the use of a balloon-assisted embolization (BAE) technique in the treatment of JNA. We conducted a retrospective review of JNA patients who underwent tumor embolization with injection of Onyx in a single session between 2013-2018. All cases displayed tumor arterial supply from ECA and ICA circulations on 2-D catheter angiograms. Procedural and surgical outcome data were analyzed. Results are given as mean±- standard deviation (range). Among 9 patients with JNA, all were males and mean age was 14.1±6.3 years (range, 9-29 years). The mean tumor volume embolization was 84.4±12.4% (range, 60-100%) and in 89% patients ≥80% of tumor volume embolization was achieved. There were no embolization-related complications reported. During surgical resection of the tumor there was a low average surgical blood loss of 722±651.5 mL (range, 50-2,000 mL) and the mean procedure time was 282.6±85.4 mins (range, 151-403 mins). In this series, the BAE technique showed to be a safe and effective approach to achieve successful tumor embolization while avoiding embolic complications and effectively reducing the risk for blood loss during surgical resection.
Terry Lopez,Samuel E. Schriner,Michael Okoro,David Lu,Beatrice T. Chiang,Jocelyn Huey,Mahtab Jafari 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.12
Green tea is a popular beverage believed to have many health benefits, including a reduction in the risks of heart disease and cancer. Rich in polyphenolic compounds known as catechins, green tea and its components have been shown to increase the lifespan of various animal models, including Drosophila melanogaster. Here, we investigated the genderspecific effects of green tea on the lifespan of fruit flies and observed that green tea extended the lifespan of male flies only. This effect was found to be independent of typical aging interventions, such as dietary restriction, modulation of oxidative energy metabolism, and improved tolerance to environmental stresses. The one exception was that green tea did protect male flies against iron toxicity. Since there is an inverse correlation between lifespan and reproduction, the impact of green tea on male reproductive fitness was also investigated. We found that green tea negatively impacted male fertility as shown by a reduced number of offspring produced and increased mating latency. We further identified that the lifespan extension properties of green tea was only observed in the presence of females which alludes to a reproductive (or mating) dependent mechanism. Our findings suggest that green tea extends the lifespan of male flies by inhibiting reproductive potential, possibly by limiting iron uptake. To our knowledge, our study is the first to report the negative impact of green tea on Drosophila male reproduction. Our results also support previous studies that suggest that green tea might have a negative effect on reproductive fitness in humans.
김참,백주영,David Humberto Lopez,김동환,김호영 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
We provided a Bi2Te3-polypyrrole hybrid material, in which energy band junction and phonon scatteringeffects should appear at the interface of the two components. The hybrid material exhibited increases inelectrical resistivity and the Seebeck coefficient due the energy band junction, thus retaining the powerfactor without loss, whereas showing a great reduction in thermal conductivity because of the phononscattering at the interface. This significant decoupling of electrical and thermal properties resulted inpredominantfigures of merit (ZTmax1.21 at 100 C and ZTave1.18 at 50–150 C) among n-type Bi2Te3or Bi2(Te,Se)3 materials previously reported.
Jose A. Lopez-Escamez,John Careyb,Won-Ho Chung,Joel A. Goebeld,Måns Magnusson,Marco Mandalà,David E. Newman-Tokerg,Michael Strupp,Mamoru Suzuki,Franco Trabalzini,Alexandre Bisdorff 대한평형의학회 2015 Research in Vestibular Science Vol.14 No.3
This paper presents diagnostic criteria for Ménierè’s disease jointly formulated by the Classification Committee of the Bárány Society, The Japan Society for Equilibrium Research, the European Academy of Otology and Neurotology, the Equilibrium Committee of the American Academy of Otolaryngology-Head and Neck Surgery, and the Korean Balance Society. The classification includes two categories: definite Ménière's disease and probable Menière's disease. The diagnosis of definite Ménière's disease is based on clinical criteria and requires the observation of an episodic vertigo syndrome associated with low- to me-dium-frequency sensorineural hearing loss and fluctuating aural symptoms (hearing, tinnitus and/or fullness) in the affected ear. Duration of vertigo episodes is limited to a period between 20 minutes and 12 hours. Probable Ménierè's disease is a broader concept defined by episodic vestibular symptoms (vertigo or dizziness) associated with fluctuating aural symptoms occurring in a period from 20 minutes to 24 hours. Res Vestib Sci 2015;14(3):67-74
On Line 시스템에 의한 실시간 입도측정 및 분쇄의 자동제어
Vargas Mariola Lopez,Hernandez Francisco Ayuso,Vilchez Francisco Martinez,Pugh David,Blasco Alain 한국시멘트협회 2004 시멘트 심포지움 Vol.31 No.-
온라인 분쇄입도 조절 콘트롤(Insitec) 시스템은 시멘트의 생산공정상에 시멘트입도를 직접 측정하고 측정된 데이터를 이용하여 공정을 제어할수 있는 새로운 방법으로서, 세계적으로 50여개의 시멘트 생산 현장에 이러한 시스템이 설치되어 있다. 시멘트의 생산공정은 일반적인 분쇄공정과는 차별되는 나름데로의 특성이 있으므로 이를 개발한 Malvern Instrument사(영국)에서는 시멘트 공장의 특성에 적합한 시스템을 개발해왔다. 우선 가장 이상적인 Instec 시스템의 설치를 위해서는 다음과 같이 3단계의 절차가 필요하다. 첫 단계로서 공정상의 변수로 적용되어야 될 변화를 찾아 모니터링하고 연관시키는 것이다. 그 다음 단계에서, 시멘트 생산공정을 24시간 동안 모니터링하여 설정 값과 측정 값과의 차이점과 원인을 찾아내어 요인을 결정하게 되고, 마지막 단계에서는 현장에 장비를 설치, 상기의 반복과정을 마무리하고 공정을 제어할 수 있게 하는 것이다. 시멘트 생산공정에서 분쇄기, 분급기 및 송풍기 등의 회전수 증가와 감소, 시멘트조성의 변화와 같은 중요한 공정상의 변화가 있을 경우, 이로 인해 생기는 입도의 영향은 Insitec 시스템의 입도관리에 기록되게 된다. 본 논문에서는 스페인의 Jerez에 있는 Holcim 플랜트에 설치된 Insitech를 이용하여 운전상의 변수 등을 측정하고 제어하며 시멘트 공정에 활용하는 방안에 대한 연구를 소개한 것이다.
김참,백주영,김동환,김종태,David Humberto Lopez,김태욱,김호영 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
A polycrystalline WSe2 nanocompound was produced via a brief thermal reaction between the atomic elements. It should grow along the in-plane direction with covalent bonds rather than along the through-plane direction with van der Waals forces, leading to both crystallographic and morphological anisotropies. Not only the anisotropies should structurally induce strong phonon scattering but they alleviate possible electron scattering at the van der Waals forces; thus, we greatly reduced thermal conductivity while minimizing electrical conductivity loss. The decoupled conductivities resulted in enhancement in figure of merit, by approximately 70% at 350 °C, thus affording a promising material for mid-temperature thermoelectric operations.