Addictive behavior in cinema demand: evidence from Korea

It is intuitively plausible that the demand for cinema services may be partly driven by addiction or habit. Yet there is almost no empirical literature which tests for whether cinema demand is addictive. We estimate addiction models for cinema demand using Korean time series data from 1963 to 2004. Our estimation results indicate that (i) addictive behavior characterizes the demand for cinema services, (ii) this behavior is rational, and (iii) habit is one of most important determinants of cinema demand. Our results also reveal that cinema attendance is generally insensitive to admission price and unrelated to income.Cinema demand, rational addiction, myopic addiction, two-stages least squares, time-series analysis

Does the Solow Residual for Korea Reflect Pure Technology Shocks?

This study investigates the relationship between the measured Solow residual and demand side variables for the Korean economy. The measured Solow residuals are shown to be Granger-caused by some demand side variables such as exports, M1, and government expenditure. A vector error correction model is constructed to investigate dynamic relation between these demand side variables and the Solow residual. Impulse response functions shows that the measured Solow residual moves pro-cyclically with the demand shocks, and that the forecast error variance of the measured Solow residual is mostly explained by past innovations of these demand side variablesSolow residual, Productivity shock, Vector error correction model

The Productivity Debate of East Asia Revisited: A Stochastic Frontier Approach

This paper applies a stochastic frontier production model to the data from Penn World Table’s 49 countries over the period 1965-1990, to decompose total factor productivity growth into technical change and technical efficiency change. Empirical results show East Asian countries led the whole world in productivity growth, mainly because their technical efficiency gain was so much faster than that of other countries. East Asian countries also registered rapid technical change, which was comparable to that of the G6 countries after the late 1980s. The results provide evidence that negate the hypothesis that East Asian growth was mostly input-driven and unsustainable.East Asian Growth, stochastic frontier production model, total factor productivity, technical progress, technical efficiency

A Counterexample on Implicit Variational Inequalities

AbstractOur aim in this note is to give a counterexample to show that some existence theorems on implicit variational inequalities recently due to Fu are false

Large scale group network optimization

Every knapsack problem may be relaxed to a cyclic group problem. In 1969, Gomory found the subadditive characterization of facets of the master cyclic group problem. We simplify the subadditive relations by the substitution of complementarities and discover a minimal representation of the subadditive polytope for the master cyclic group problem. By using the minimal representation, we characterize the vertices of cardinality length 3 and implement the shooting experiment from the natural interior point. The shooting from the natural interior point is a shooting from the inside of the plus level set of the subadditive polytope. It induces the shooting for the knapsack problem. From the shooting experiment for the knapsack problem we conclude that the most hit facet is the knapsack mixed integer cut which is the 2-fold lifting of a mixed integer cut. We develop a cutting plane algorithm augmenting cutting planes generated by shooting, and implement it on Wong-Coppersmith digraphs observing that only small number of cutting planes are enough to produce the optimal solution. We discuss a relaxation of shooting as a clue to quick shooting. A max flow model on covering space is shown to be equivalent to the dual of shooting linear programming problem.Ph.D.Committee Chair: Ellis L. Johnson; Committee Member: Brady Hunsaker; Committee Member: George Nemhauser; Committee Member: Jozef Siran; Committee Member: Shabbir Ahmed; Committee Member: William Coo

의상시착 학습:옷과 사람의 분리를 통해 옷의 상세 정보를 살려주는 시착방법

학위논문(석사) -- 서울대학교대학원 : 데이터사이언스대학원 데이터사이언스학과, 2023. 2. 이준석.Virtual try-on, fitting an image of a garment to an image of a person, has rapidly progressed recently. However, existing virtual try-on methods still struggle to faithfully represent various details of the clothes when worn. In this paper, we propose a simple yet effective method to better preserve details of the clothing and person by introducing an additional fitting step after geometric warping. This minimal modification helps to effectively learn disentangled representations of the clothing from the wearer. By disentangling these two major components for virtual try-on, we are able to preserve the wearer-agnostic structure and details of the clothing, and thus can fit a garment naturally to a variety of poses and body shapes. Moreover, we propose a novel evaluation framework applicable to any metric, to better reflect the semantics of clothes fitting. From extensive experiments, we empirically verify that the proposed method not only learns to disentangle clothing from the wearer, but also preserves details of the clothing on the try-on results.원하는 옷의 이미지를 사람의 이미지에 맞추어 입혀주는 가상 의류 시착 기술은 최근 빠르게 발전하고 있다. 하지만 현재 존재하는 가상 시착 방법들은 옷이 입혀졌을 때의 디테일을 잘 표현하지 못하고 있다. 본 논문에서, 나는 기하학적 변형 단계이후에 추가적인 피팅 단계를 추가함으로써 옷의 디테일을 보다 잘 살릴 수 있는 단순하지만 효과적인 방법을 제안한다. 이 최소한의 변화는 사람과 옷을 효과적으로 분리하는 방법을 소개하며, 이를 통해 옷의 디테일을 자연스럽고 효과적으로 합성할 수 있다. 또한, 본 논문에서 기존 측정방법에 적용할 수 있는 새로운 평가방법을 제안한다. 실험을 통해 본 논문에서 제시한 방법이 옷과 사람을 효과적으로 분리할 뿐만 아니라, 옷의 디테일을 자연스럽게 보존함을 보였다.Chapter 1. Introduction 3 Chapter 2. Related Work 5 Chapter 3. Preliminary 6 Chapter 4. The Proposed Method: DP-VTON 8 Chapter 5. Experiments 12 Chapter 6. Summary 19 Chapter 7. Supplementary materials 19 Bibliography 30 Abstract in Korean 35석