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『추락하는 모든 것들의 소음』 속 소리를 통한 현실 인식과 역사 서술
김동준 ( Kim¸ Dongjoon ) 한국스페인어문학회 2021 스페인어문학 Vol.- No.100
This study aims to analyze how auditory elements were described and what they symbolize in El ruido de las cosas al caer by Juan Gabriel Vasquez. Sound is an effective means for human beings to interact with others and to realize changes of circumstances around them. In this novel, sound functions as a measure for characters to be aware of reality and to approach the dark side of the history of Colombia. First, Antonio Yammara, the narrator, recognizes the problem of violence in his country by listening to noise after the gun attack in which he was injured. Second, the black box recorded on a cassette tape, which caught the moment of a plane crash, guides Antonio to the tragic history of Colombia. He realizes that an individual is inseparable from the national history, and tries to solve the recurring problem. At this point, communication serves as a key. Telephone call provides him with the opportunity to meet other people and listen to their voices, which allows him to get involved in writing history and to form solidarity in seeking the possibility of a new world.
Dongjoon Myung,Wooram Noh,김지훈,Jinhak Kong,Sung‑Tae Hong,Myoung‑Gyu Lee 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.4
In this study, a simulation-based examination on the deformation mechanism in the friction stir welding (FSW) process isconducted, which may not be efficiently feasible by experiment due to severe deformation and rotation of material flow neara tool pin. To overcome the severity of distortion of plastically deforming finite element meshes in the Lagrange formulation,and an over-simplified elastic-plasticity constitutive law and contact assumption in the Eulerian formulation, the arbitraryLagrangian–Eulerian (ALE) formulation is employed for the finite element simulations. Superior accuracy in predictingthe temperature profiles and distributions of the friction stir welded aluminum alloy workpiece could be obtained comparedto the results of Eulerian based simulations. In particular, the ALE based simulations could predict the sharper gradient oftemperature decrease as the distance from the welding zone increases, while the Eulerian based model gives more uniformprofiles. The second objective of the study is to investigate the coupling of simulation-based temperature histories into thestrength prediction model, which is formulated on the basis of precipitation kinetics and precipitate-dislocation interaction. The calculated yield strength distribution is also in better agreement with experiment than that by the Eulerian based model. Finally, the mechanism of the FSW process is studied by thoroughly examining the frictional and material flow behaviorof the aluminum alloy in the welded zone. It is suggested that the initially high rate of temperature increase is attributedto frictional heat due to slipping of material on the tool surface, and the subsequent saturated temperature is the result ofsequential repetitive activations of the sticking and slipping modes of the softened material. The sticking mode is the mainsource of plastically dissipated heat by the large plastic deformation around the rotating tool pin. The present integratedfinite element simulation and microstructure-based strength prediction model may provide an efficient tool for the designof the FSW process.
First-Mover and Second-Mover Advantages in a Bilateral Duopoly
( Dongjoon Lee ),( Kangsik Choi ),( Kyuchan Hwang ) 한국경제학회 2017 The Korean Economic Review Vol.33 No.1
This study examines a first-mover and a second-mover advantage in a vertical structure in which each upstream firm trades with an exclusive retailer and downstream retailers move sequentially. We provide two main claims. One is that, in Cournot (Bertrand) competition, the leader`s upstream firm sets the input price equal to its marginal cost (equal to its marginal cost), while the follower`s upstream firm sets the input price below its marginal cost (above its marginal cost). The other is that the follower`s (leader`s) upstream firm enjoys higher profits than the leader`s (follower`s) upstream firm in Cournot (Bertrand) competition.
Do Firms Choose Over-Capacity or Under-Capacity in a Vertical Structure?
( Dongjoon Lee ),( Kangsik Choi ) 한국산업조직학회 2016 한국산업조직학회 정책세미나 논문집 Vol.2016 No.1
This study investigates capacity choice in a vertical structure in which each downstream firm makes its capacity decision, then a monopolistic upstream firm proposes the input or two-part tariff contract, and finally, it chooses its output (or price). We show that, from the downstream firms “point of view, they strategically have an incentive to hold over-capacity (under-capacity) in Cournot (Bertrand) competition. We also show that, form the viewpoint of the monopolistic upstream firm, it has an incentive to extract the rent from downstream firms’ capacity activity. Our main findings are as follows. First, contraty to the conventional wisdom that firms hold excess capacity in an oligopolistic market, we find that, regardless of both the nature of goods and the competition modes (Bertrand or Cournot), each downstream firm always chooses under-capacity. Second, we also show that capacity-efficiency is higher under Cournot competition than under Bertrand competition. Third, even though there are double marginalization distortion and rent-extracting effect, we can achieve the monopoly equilibrium of the vertically integrated firm though two-part tariff-contract.