31,032 research outputs found
LAPAROSCOPIA EN LA CONTRACEPCIÓN: CLIPS DE FILSHIE VERSUS ANILLOS DE YOON
No full textObjetivo: Comparar la aplicación de clips de Filshie contra anillos de Yoon a través de laparoscopia para identificar cual método tiene menos complicaciones. Material y Métodos: De 1999 a 2004 en el Servicio de Endoscopia Ginecológica de la División de Ginecología y Obstetricia del Hospital Civil de Guadalajara "Dr. Juan I. Menchaca" se realizó un estudio de tipo analítico, casos y controles, en 260 pacientes que se les aplicó clips de Filshie comparándolos con 260 pacientes con anillos de Yoon, utilizándose como pruebas estadística Chi cuadrado y exacta de Fisher. Resultados: Ambos grupos fueron similares en edad, estado civil, peso y talla, hijos vivos, antecedente de cesárea y modalidad (intervalo o postparto). Se presentaron complicaciones en 7 pacientes del grupo de clips de Filshie, mientras en el grupo de anillos de Yoon hubo complicaciones en 15 pacientes, requiriendo laparatomía en tres casos; diferencias no significativas (c2=2,32; p=0,12). Conclusión: La aplicación de clips de Filshie y los anillos de Yoon presentan similar número de complicaciones en la contracepción quirúrgica laparoscópica. Se recomienda la aplicación de clips de Filshie especialmente en mujeres jóvenes por mayor probabilidad de solicitud de revertir el procedimientoObjective: The aim of the present study was to compare the Filshie clip versus Yoon ring in order to know what is the best method and with lesser complications. Material and methods: From 1999 to 2004 in the Service of Gynecology Endoscopic of the Hospital Civil de Guadalajara "Dr. Juan I. Menchaca" we made a study with 260 patients of Filshie clip compared with 260 patients of Yoon ring. Statistical analysis included Chi-square or Fisher exact test. Results: Both groups were similars in relation to age, marital status, weight, height, previous cesarean section and type (interval or postpartum). In the Filshie clip group there were seven patients with complications while in the Yoon ring group fifteen patients of which three cases finished in laparatomy; difference not significant (c2=2.32; p=0.12) . Conclusions: The Filshie clip and the Yoon ring present similar number of surgical complication. The Filshie clips application is recommended specially in young women by greater probability of reversa
Jennifer C. POST, Sunmin YOON, and Charlotte D’EVELYN eds : Mongolian Sound Worlds
Get PDFLe présent ouvrage collectif, coordonné par les ethnomusicologues étatsuniennes Jennifer C. Post, Sunmin Yoon et Charlotte D’Evelyn, est justifié par un constat : les Mongols ont toujours vécu « dans un dialogue constant avec la musique et le son » (Yoon : 1). Le propos du livre est donc d’« embrasser la situation complexe des cultures sonores mongoles à l’orée du XXIe siècle [et] de partager des informations sur un large éventail de genres et de paysages sonores [eng. soundscapes] de la cult..
Analyzing Online Customer Dissatisfaction Toward Perishable Goods
No full textCustomers' willingness to purchase products varies based on product category due to the inherent limitations of virtual shopping. This study examines the expectations and dissatisfaction associated with purchasing perishable grocery goods online based on previous purchasing experiences of sensory goods (e.g., clothes, shoes, etc.) from online and other direct channels. Applying the model of dissatisfaction (Oliver, 1997), the purpose of this study is to explore how previous expectations affect the (perceived risk of imagined) dissatisfaction associated with the non-purchase/purchase decision; the effects of the (perceived risk of imagined) dissatisfaction on the degree of regret; and the effects of the degree of regret on reconstructed expectations. This study conducts surveys and applies statistical analyses, such as factor, regression, ANOVA, and ANCOVA to investigate the findings. Results of the study provide managerial and theoretical implications and offer suggestions to e-businesses. (C) 2011 Elsevier Inc. All rights reserved.1
Decentralized Approximate Bayesian Inference for Distributed Sensor Network
No full textBayesian models provide a framework for probabilistic modelling of complex datasets. Many such models are computationally demanding, especially in the presence of large datasets. In sensor network applications, statistical (Bayesian) parameter estimation usually relies on decentralized algorithms, in which both data and computation are distributed across the nodes of the network. In this paper we propose a framework for decentralized Bayesian learning using Bregman Alternating Direction Method of Multipliers (B-ADMM).We demonstrate the utility of our framework, with Mean Field Variational Bayes (MFVB) as the primitive for distributed affine structure from motion (SfM).Peer reviewe
Fast ADMM Algorithm for Distributed Optimization with Adaptive Penalty
No full textWe propose new methods to speed up convergence of the Alternating Direction Method of Multipliers (ADMM), a common optimization tool in the context of large scale and distributed learning. The proposed method accelerates the speed of convergence by automatically deciding the constraint penalty needed for parameter consensus in each iteration. In addition, we also propose an extension of the method that adaptively determines the maximum number of iterations to update the penalty. We show that this approach effectively leads to an adaptive, dynamic network topology underlying the distributed optimization. The utility of the new penalty update schemes is demonstrated on both synthetic and real data, including an instance of the probabilistic matrix factorization task known as the structure-from-motion problem.Peer reviewe
Narrowband, polarization insensitive all-fiber acousto-optic tunable bandpass filter
No full textWe demonstrate an all-fiber acousto-optic tunable bandpass filter exhibiting narrow optical bandwidth and negligible polarization dependence by employing a novel ultraviolet (UV)-induced core-mode blocker written in a high numerical aperture (NA) fiber. It was demonstrated that the device had the measured 3-dB optical bandwidth of 0.65 nm, the polarization-dependent center-wavelength splitting of 0.05 nm and the extinction ratio of -22dB at the wavelength around 1550 nm. The details of the transmission characteristics and the loss mechanism of the core-mode blocking element inscribed in the high NA fiber are discussed. (c) 2007 Optical Society of America.The authors thank Dr. Hyuk-Jin Yoon of Korea Railroad Research Institute and Kyung Joon
Han of Optical Engineering and Quantum Electronics Laboratory in Seoul National
University for allowing the use of KrF eximer lasers
Yoon, Hyung Chul
No full text학위논문(석사)----아주대학교 일반대학원 :환경공학과,2008. 2오늘날 인구의 증가와 산업발달로 인한 물의 수요증대 및 사용수의 재처리 문제 등 수자원의 확보와 유지, 보호는 매우 중대한 과제로 부각되고 있다.
산업발전에 따른 국민의 삶의 질 향상은 매년 물의 수요량을 증가시킨 동시에 하천 오염을 가중시켰다. 그리하여 많은 하수처리장이 건설되었고 그에 따른 하수슬러지의 발생량도 점차 증가하였다.
현재 우리나라 하수처리장에서 발생되는 하수슬러지는 생물학적 안정화 공정을 거친 후 기계적 탈수를 통하여 해양배출, 매립, 소각, 재이용 등과 같은 최종 처분을 하고 있다.
최근 조사에 의하면 2005년 기준으로 하수슬러지의 해양배출의 비율(77.9%)이 다른 최종 처분보다 가장 높았고 그 비율은 매년 늘어나고 있는 추세로 나타났다.
하수처리장내 생물학적 처리공정에서 만족할만한 처리수를 얻기 위해서는 유입수의 유기물 농도와 총질소 농도의 비(C/N비)가 적절히 유지되어야 한다. 국내에 적용된 생물학적 영양염류 제거 공정의 효율 저하 원인은 유입 원수의 낮은 C/N비로 인한 탄소원 부족으로 지적되고 있어 외부탄소원의 공급이 필요한 실정이다.
본 연구에서는 생물학적 영양염류 제거를 위한 외부탄소원으로서 열수가압 탈리액의 효과에 대하여 알아보고자 C/N비가 낮은 하수를 연속식 생물반응기 공정에 공급한 후 열수가압반응 탈리액을 주입하여 C/N비 변화에 따른 유기물과 질소의 제거효율을 조사하였다.
실험 결과 COD/TKN비를 5:1로 조절하였을 경우 열수가압탈리액 200℃의 유기물 및 질소 제거 효율이 250℃보다 우수하였으며 COD/TKN비를 3:1로 낮추었을 경우에는 열수가압탈리액 250℃의 효율이 우수한 것으로 나타났다. 또한, 순수탄소원과 비교하여도 효율이 떨어지지 않는 것으로 나타났다
그러므로 열수가압 탈리액을 C/N비가 낮은 국내도시의 하ㆍ폐수 처리에 외부 탄소원으로 적용한다면 효과적으로 하수슬러지 문제를 해결함과 동시에 저비용으로 생물학적 영양염류제거 공정을 운영할 수 있을 것으로 기대된다.제1장 서론 = 1
제2장 이론적 고찰 = 5
제1절 하수슬러지의 성상 및 특성 = 5
2.1.1 하수슬러지의 성상 = 5
2.1.2 하수슬러지의 특성 = 7
2.1.3 국내 하수슬러지의 발생 및 현황 = 11
제2절 생물학적 질소제거 = 15
2.2.1 생물학적 질소제거 개요 = 15
2.2.2 질산화(Nitrification) = 18
2.2.3 탈질산화(Denitrification) = 28
제3절 외부탄소원 = 39
2.3.1 외부탄소원의 개요 = 39
2.3.2 외부탄소원의 종류 = 41
제4절 열수가압반응 = 52
2.4.1 열수가압반응(Thermal Hydrolysis Reaction) = 52
제3장 실험장치 및 방법 = 54
제1절 열수가압반응 System = 54
제2절 생물학적 질소제거 System = 57
3.2.1 혐기조(Anaerobic reactor) = 59
3.2.2 무산소조(Anoxic reactor) = 60
3.2.3 호기조(Aerobic reactor) = 60
제3절 외부탄소원 주입실험 = 61
3.3.1 유입시료 성상 = 61
3.3.2 열수가압반응 탈리액 = 63
3.3.3 실험방법 = 64
3.3.4 분석방법 = 65
제4장 결과 및 고찰 = 67
제1절 유기물 제거 = 67
4.1.1 COD 제거 = 67
제2절 질소 제거 = 83
4.2.1 NH3-N 제거 = 83
4.2.2 NO3-N 제거 = 91
제3절 미생물량 거동특성 = 99
4.3.1 C/N비 변화에 따른 미생물량 거동특성 = 99
제5장 결론 = 101
참고문헌 = 103
Abstract = 108MasterNowadays, the protection and maintenance of the liquid resources like the demand of water and recycling of water become a very important issue caused by the population growth and industrial development.
Improvement of quality in life caused by industrialization in Korea led the amount of water demand has been increased every year and the pollution of river augment. Therefore, many municipal wastewater treatment plant have been built and the production of sewage sludge has increased.
Now, sewage sludge produced in sewage treatment plants of Korea is treated as following processes : thickening, stabilization, dewatering and ultimate disposal.
According to our most recent survey revealed that Ocean dump rate (77.9%) of Sewage sludge has become the highest in 2005 and it is increasing every year.
The ratio of carbon to nitrogen sources (C/N ratio) is important to satisfy the water purification level in biological treatment processes of municipal wastewater treatment plant. Due to low carbon contents in wastewater, the removal efficiency was decreased in biological nutrients removal process.
In this research, the effect as external carbon source of thermal hydrolysis reaction liquid product(T.H.L) was studied. The effects of T.H.L addition into wastewater that had low COD/TKN ratio in bio reactor process on Organic compound and nitrogen removal efficiencies were investigated
Experiments were conducted at various C/N ratio with a continuous flow system under aerobic and anoxic condition.
The result of the continuous experiments showed that organic compound and nitrogen removal efficiency of T.H.L 200℃ increased as COD/TKN ratio become 5:1 and increased T.H.L 250℃ as COD/TKN ratio become low(3:1)
Also, experiment results showed that removal efficiency of T.H.L has a look of Glucose.
Therefore, the efficient nutrients removal process can be established when T.H.L and wastewater that has low C/N ratio are simultaneously fed into bio reactor
A Knowledge Distribution Model to Support an Author in Narrative Creation
No full textAdjusting the knowledge of characters and the reader is a critical task for an author in narrative creation. Throughout a narrative, both characters and the reader experience events according to their own timelines and perspectives. They interpret information accumulated through their experience and update knowledge to the narrative-world which the author constructed. In this paper, we present a Knowledge Distribution Model which supports an author in finely controlling the knowledge of characters and the reader. Within the model, the Knowledge Structure is constructed by connecting event, information, and knowledge. The Knowledge State is evaluated as the degree of belief under the knowledge structure. We adopted a probabilistic reasoning model to calculate the knowledge state. The change in knowledge state, defined as Knowledge Flow, is visually presented to the author. We designed a GUI prototype to implement the proposed modeling process, and demonstrated the knowledge flow with an actual cinematic narrative
Distributed Probabilistic Learning for Camera Networks
No full textProbabilistic approaches to computer vision typically assume a centralized setting, with the algorithm granted access to all observed data points. However, many problems in wide-area surveillance can benefit from distributed modeling, either because of physical or computations constraints. In this work we present an approach to estimation and learning of generative probabilistic models in a distributed context. In particular, we show how traditional centralized models, such as probabilistic principal component analysis (PPCA), can be learned when the data is distributed across a network of sensors. We demonstrate the utility of this approach on the problem of distributed affine structure from motion (SfM). Our experiments suggest that the accuracy of the accuracy of the learned probabilistic structure and motion models rivals that of traditional centralized factorization methods.Technical report DCS-TR-69
Assessing User Attitudes Toward Mobile Commerce In The U.S. Vs. Korea: Implications For M-Commerce CRM
Get PDFMobile Commerce (m-commerce) relies on “customer or user interactions” via a mobile device and telecommunications infrastructure for the purpose of interacting, advertising, promoting, and selling products and services. The author of this study explored user attitudes and behavior toward m-commerce in the U.S. vs. Korea. In this paper, the author investigated comparison analysis for the U.S. vs. Korea for the following issues: 1) the factors affecting user attitudes toward mobile phone business; 2) how those factors affect perceived ease of use (EOU) and usefulness (U); 3) the effects of perceived ease of use (EOU) and usefulness (U) on overall attitudes toward the mobile phone business; and 4) how overall attitudes toward mobile phone business affect user/customer satisfaction. Surveys were conducted in two countries and the results reveal the different aspects affecting mobile phone usage in the U.S. vs. Korea. This study also found that user attitudes toward the mobile phone business significantly impact the level of m-satisfaction. Furthermore, this study provides managerial implications and offers suggestions to m-businesses.1
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