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UNIT GROUPS OF QUOTIENTS OF NUMBER FIELDS
Caro-Reyes, Jerson,Mantilla-Soler, Guillermo Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.2
Let K be a number field. Here we give an explicit description of the group (O<sub>K</sub>/I)* for most ideals I. In particular, we give a complete characterization of such group for those ideals I that are coprime to the different ideal 𝒟<sub>K</sub>.
Pablo Caro-Dominguez,Rajiv Chaturvedi,Govind Chavhan,Simon C. Ling,Deane Yim,Prashob Porayette,Christopher Z Lam,Tae Kyoung Kim,Mike Seed,Lars Grosse-Wortmann,Shi-Joon Yoo 대한영상의학회 2019 Korean Journal of Radiology Vol.20 No.7
Objective: To investigate the regional flow distribution in patients with Fontan circulation by using magnetic resonance imaging (MRI). Materials and Methods: We identified 39 children (18 females and 21 males; mean age, 9.3 years; age range, 3.3–17.0 years) with Fontan circulation in whom flow volumes across the thoracic and abdominal arteries and veins were measured by using MRI. The patients were divided into three groups: fenestrated Fontan circulation group with MRI performed under general anesthesia (GA) (Group 1, 15 patients; average age, 5.9 years), completed Fontan circulation group with MRI performed under GA (Group 2, 6 patients; average age, 8.7 years), and completed Fontan circulation group with MRI performed without GA (Group 3, 18 patients; average age, 12.5 years). The patient data were compared with the reference ranges in healthy controls. Results: In comparison with the controls, Group 1 showed normal cardiac output (3.92 ± 0.40 vs. 3.72 ± 0.69 L/min/m2, p = 0.30), while Group 3 showed decreased cardiac output (3.24 ± 0.71 vs. 3.96 ± 0.64 L/min/m2, p = 0.003). Groups 1 and 3 showed reduced abdominal flow (1.21 ± 0.28 vs. 2.37 ± 0.45 L/min/m2, p < 0.001 and 1.89 ± 0.39 vs. 2.64 ± 0.38 L/min/m2, p < 0.001, respectively), which was mainly due to the diversion of the cardiac output to the aortopulmonary collaterals in Group 1 and the reduced cardiac output in Group 3. Superior mesenteric and portal venous flows were more severely reduced in Group 3 than in Group 1 (ratios between the flow volumes of the patients and healthy controls was 0.26 and 0.37 in Group 3 and 0.63 and 0.53 in Group 1, respectively). Hepatic arterial flow was decreased in Group 1 (0.11 ± 0.22 vs. 0.34 ± 0.38 L/min/m2, p = 0.04) and markedly increased in Group 3 (0.38 ± 0.22 vs. -0.08 ± 0.29 L/min/m2, p < 0.0001). Group 2 showed a mixture of the patterns seen in Groups 1 and 3. Conclusion: Fontan circulation is associated with reduced abdominal flow, which can be attributed to reduced cardiac output and portal venous return in completed Fontan circulation, and diversion of the cardiac output to the aortopulmonary collaterals in fenestrated Fontan circulation.
Cas, Caro Lu 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
In this paper, an ART2 type architecture is proposed for approximate inference from a set of production rules and an observed premise. The antecedents and consequents of the rules and the observation can be fuzzy, and the rule set may be incomplete. The reasoning method is based on a recently proposed approximate analogical reasoning meta-algorithm as well as some proposed modifications that make it more deductive. It is possible to devise a training algorithm so that the proposed neural network can be used as a reprogrammable inference engine.
Inference in affine shape theory under elliptical models
Francisco J. Caro-Lopera,José A. Díaz-García,Graciela González-Farías 한국통계학회 2014 Journal of the Korean Statistical Society Vol.43 No.1
This paper studies the elliptical statistical affine shape theory under certain particular conditionson the evenness or oddness of the number of landmarks. In such a case, the relateddistributions are polynomials, and the inference is easily performed; as an example, a landmarkdata is studied, and the performance of the polynomial density versus the usual seriesdensity is compared.
Effects of Privacy Concern on Trust and Intention to Incremental Usage of Social Networking Systems
글렌카로,남수현,강신철,송희석,Caro, Glenn C.,Namn, Su-Hyeon,Kang, Shin-Cheol,Song, Hee-Seok The Society of Digital Policy and Management 2008 디지털융복합연구 Vol.6 No.4
본 논문은 사회네트워크(social network system, SNS)에 대한 사용자의 추가적 사용의도를 개인정보보호의 관점에서 고찰하였다. SNS에서 사용자는 SNS의 운영 시스템과 사용자간 정보의 교류가 이루어지는 SNS사이트라는 서로 다른 두 주체와의 상호작용을 통하여 개인정보의 보호 정도를 인지하게 되고, 이러한 인지정도는 사회네트워크시스템과 SNS사이트에 대한 신뢰에 각각 영향을 미치고, 이 신뢰는 사용자의 사용의도를 증가시킨다는 연구모델을 설정하고 가설을 검정하였다. 주요 연구 결과는 SNS 시스템과 SNS 사이트에 대해 사용자가 인지하는 개인정보보호의 수준은 SNS시스템과 SNS사이트에 대한 신뢰 수준에 통계적으로 유의한 영향을 미치는 반면, 사용자의 추가적 사용의도는 단지 SNS 시스템의 신뢰에 의해서만 영향을 받는 것으로 나타났다.
Hooman Homayouni,Fariba Bahrami,Caro Lucas 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Inspired by human locomotion system, we have proposed a gait controller for planar walking of a biped robot. On the basis of biomechanical and neurophysiologic studies of human gait, a two-layer controller is proposed. Lower layer of the controller consists of models of three neural mechanisms identified in the spinal cord: cutaneous reflex, stretch reflex, and central pattern generator (CPG). Upper layer controller maintains stability of the robot by employing fuzzy rule-based approach in applying two main strategies derived from biomechanical studies of human locomotion, that is ankle torque control and foot placement adjustment. Proposed controller does not require precise model of the mechanical system of the robot. Simulation results prove the capability of the proposed controller to generate a stable planar biped gait for the model robot. Stable limit-cycle for kinematic variables emerges from interaction of mechanical system with low-level mechanisms and high-level fuzzy controller. In facing disturbances, in form of a push from both front and behind, robot shows great ability to maintain its balance. This balance control is provided by the upper layer rule-based controller.
Antonio Testa,Salvatore De Caro,Tommaso Scimone,Romeo Letor 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
Some of DC actuators used in home automation, office automation, medical equipment and automotive systems require a position sensor. In low power applications, the introduction of such a transducer remarkably increases the whole system cost, which justifies the development of sensorless position estimation techniques. The well-known AC motor drive sensorless techniques exploiting the fundamental component of the back electromotive force cannot be used on DC motor drives. In addition, the sophisticated approaches based on current or voltage signal injection cannot be used. Therefore, an effective and inexpensive sensorless position estimation technique suitable for DC motors is presented in this paper. This technique exploits the periodic pulses of the armature current caused by commutation. It is based on a simple pulse counting algorithm, suitable for coping with the rather large variability of the pulse frequency and it leads to the realization of a sensorless position control system for low cost, medium performance systems, like those in the field of automotive applications.
ELECTRICALLY ASSISTED INTERNAL COMBUSTION ENGINES: A COMPARATIVE ANALYSIS
Carlo Scaffidi,Salvatore De Caro,Salvatore Foti,Tommaso Scimone,Antonio Testa 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.6
An electrically assisted internal combustion engine is obtained by combining a conventional engine and one or more electrical motors of considerably smaller size. A key feature of such an innovative vehicle hybridization approach is that the torque generated by electric machines is not transmitted to the wheels. The electric motors are, in fact, intended only to assist the internal combustion engine in low efficiency, low performance, or high polluting working conditions. They however, draw extra power and energy from the battery. This paper presents a tool to evaluate different possible solutions in terms of energy balance, efficiency, battery stress and battery ageing. The method, which is based on suitable mathematical models and specific analysis criteria is also exploited to compare eight different configurations of a C-segment vehicle, pointing out limits and capabilities of traditional 12−14 V systems.