김민혁 교수

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We investigate the dynamic relationship between individual investor sentiment and stock returns in the Korean stock market. The evidence indicates that individual investor sentiment has no significant explanatory power for cross-sectional stock returns. However, individual investors’ trades can move stock prices in certain stocks by their contrarian behavior, which leads them to implicitly provide liquidity to other market participants. In addition, individual investors earn a small market-adjus

We demonstrate the use of the ultrafast spatial coherent-control method to resolve the fine-structure two-photon transitions of atomic rubidium. Counter-propagating ultrafast optical pulses with spectral phase and amplitude programmed with our optimized solutions successfully induced the two-photon transitions through 5S_1/2-5P_1/2-5D and 5S_1/2-5P_3/2-5D pathways, both simultaneously and at distinct spatial locations. Three different pulse-shaping solutio

One prominent application of near-term quantum computing devices is to solve combinatorial optimization such as non-deterministic polynomial-time hard (NP-hard) problems. Here we present experiments with Rydberg atoms to solve one of the NP-hard problems, the maximum independent set (MIS) of graphs. We introduce the Rydberg quantum wire scheme with auxiliary atoms to engineer long-ranged networks of qubit atoms. Three-dimensional (3D) Rydberg-atom arrays are constructed, overcoming the intrinsic

This study contrasts 'surviving' and 'failed' savings banks regarding depositor discipline, and how each group responds to the disciplinary action of depositors.The analysis showed that deposits in surviving savings banks decreased when the banks faced higher management risks, while deposits in the failed ones increased even when the banks faced higher management risks.Uninsured deposits were more sensitive to management risks than insured deposits, and were subject to stronger depositor discipl

This study analyzes the relationship between financial conglomerate affiliation, insurance companies’ performance, and risk. For verification, a univariate analysis was conducted using a propensity score matching technique and an ordinary least squares regression model was estimated. As a robustness check, the Heckman two-stage regression model, which is known for correcting self-selection bias, was also estimated. The main results are as follows. First, as a result of belonging to a financial c

증강현실 기술을 게임에 접목하려는 시도가 많이 이루어지고 있다. 본 논문에서는 실시간으로 스마트 기기의 카메라로부터 손동작 2차원 영상을 획득하고 HSV 컬러 영역을 활용하여 해당 색상의 물체 또는 신체를 실시간으로 검출해, 게임의 요소로 활용하여 즐길 수 있는 2D 퍼즐게임을 개발하였다. 이는 스마트 기기에 컴퓨터 비전을 접목한 형태의 게임으로, 교육 및 엔터테인먼트 환경에서 스마트 기기의 휴대성과 가상현실 체험의 현장감을 접목시킨 새로운 인터랙티브 기술이 될 것이다.

We model and experimentally verify the quantum dynamics of small-scale Rydberg-atom quantum simulators, or entangled Rydberg atom clusters, using Lindblad equations with control parameters including spontaneous emission, stochastic atom loss, and laser phase noise.

The approaches that guide Large Language Models (LLMs) to emulate human reasoning during response generation have emerged as an effective method for enabling them to solve complex problems in a step-by-step manner, thereby achieving superior performance.However, most existing approaches using few-shot prompts to generate responses heavily depend on the provided examples, limiting the utilization of the model's inherent reasoning capabilities.Moreover, constructing task-specific few-shot prompts

We demonstrate the use of the ultrafast spatial coherent-control method to resolve the fine-structure two-photon transitions of atomic rubidium. Counter-propagating ultrafast optical pulses with spectral phase and amplitude programmed with our optimized solutions successfully induced the two-photon transitions through $5S_{1/2}$-$5P_{1/2}$-$5D$ and $5S_{1/2}$-$5P_{3/2}$-$5D$ pathways, both simultaneously and at distinct spatial locations. Three different pulse-shaping solutions are introduced th

We provide datasets for Figure 2(d-f, j-l), Figure 3(e,f), and Figure 4(d), respectively.<br>Each file has a N by M matrix, in which the rows and columns are binary spin configurations of each qubits(N) and repeated events(M).<br>For example, a following data has a matrix with size : digitized_data_fig2d.csv (for Figure 2. d): 4 X 678digitized_data_fig3e.csv (for Figure 3. e): 11 X 1961