The Effect of Resource Allocation on the Performance of an Organization: An Application to the Professional Basketball League

안대용 한국산업경제학회 2013 산업경제연구 Vol.26 No.1

This paper studies the effect of resource allocation on the performance of an organization. To this end, we propose a set of numerical measures that summarize the organization’s resources, including the total amount of resources and the distribution of resources across members of the organization. We investigate how the makeup of team rosters affect the performance of teams in the National Basketball Association. We found that the total amount of resources is the key determining factor of having a successful team. Moreover, the fixed amount of resources can result in drastically different outcomes depending on how those resources are allocated. Our counterfactual simulation shows that some teams can even double their wins simply by re-arranging their rosters.

Reputation Effect, Business-stealing Effect, and Income Effect in Amazon’s Co-purchasing Product Networks

안대용,이진용 한국상품학회 2015 商品學硏究 Vol.33 No.6

This paper is an empirical examination of the reputation, business-stealing and income effects that pervade co-purchasing product networks. Co-purchasing between a pair of products refers to a situation where the two products are frequently purchased together (but not necessarily at the same time). Online retailers frequently use co-purchasing relationships as a basis for recommending products to their customers. (For example, Amazon has the section“Customers Who Bought This Item Also Bought” for its products.) How effective is this strategy? What features of co-purchasing product networks can be used to promote the sales of a given product? These are the empirical questions of our study. To this end, we use the data collected from Amazon.com, which has three major components: (1) sales ranks (as a measure of relative sales), (2) online reviews by customers (as a proxy for product quality), and (3) co-purchasing product networks (from “Customers Who Bought This Item Also Bought”). We construct two sets of features for co-purchasing networks: One contains the number, the average product rating, and the average sales rank, of co-purchased products, and the other contains the same variables for co-purchased products with a two degrees of separation (co-purchased products of co-purchased products). We hypothesize that there can be various effects of co-purchased products: They may enhance the reputation of a given product by association if they are well received by consumers (Reputation effect). They also compete with the given product by being substitutes (Business-stealing effect). Finally, these products pursue the same, limited consumer budgets (Income effect). Our results show that the reputation effect might be much smaller than the business-stealing effect of co-purchased products for co-purchased products with a two degrees of separation (co-purchased products of co-purchased products) than for co-purchased products with one degree of separation. Our results shed light on how to use co-purchasing information to design an effective product recommendation strategy.

지방재정 질의회신 사례

안대용 한국지방재정공제회 2019 지방재정 Vol.2019 No.3

선형 매개변수 가변 방식을 이용한 개인 이동체의 강인 제어

안대용,강창묵 한국자동차공학회 2024 한국 자동차공학회논문집 Vol.32 No.2

In this paper, a Linear Parameter Variable(LPV) controller is proposed to ensure the velocity control of personalmobility by varying the system’s mass and inertia. Particularly, we will be testing robust control techniques on electricwheelchair-type personal mobility devices used by many people in hospitals or government offices. To validate the effectiveness of the proposed LPV approach, a kinematics-based controller, a single linear quadratic regulator(LQR) controller, and an LPV controller were compared and analyzed under the ROS Gazebo environment. Simulation results confirmed that the proposed LPV-based control method improved control performance, compared to kinematics-based controllers or LQR controllers that used fixed control values.

How Walmart Supercenter Affect Grocery Store Formats

안대용,정환,조춘한(토론자) 한국유통학회 2019 한국유통학회 학술대회 발표논문집 Vol.2019 No.4

시계열 IMU 데이터를 활용한 개인 이동체의 인공지능 기반 도로 분류 시스템

안대용,정철민,이화수,김건태,강창묵 제어로봇시스템학회 2023 제어로봇시스템학회 국내학술대회 논문집 Vol.2023 No.6

A Dynamic Model of User Behavior in a Social Network Site

안대용,랜달,이진용 한국상품학회 2017 商品學硏究 Vol.35 No.5

This paper estimates a dynamic model of user behavior in a social network site using unique data on the daily login activity of a sample of members of MySpace.com. We view a social network as a stock of capital that yields a flow of utilities over time by creating interactions between the site user and her friends. This capital stock can be maintained and expanded by logging in to the site and communicating with other members, making the user's login decision a forward-looking one. We allow for two sources of persistence in members' login decisions: state dependence and unobserved heterogeneity. Unlike many reduced-form models used in the studies of social network sites, our structural approach allows us to perform a series of counterfactual simulations, which can be used to assess the effects of new site features on site traffic. We found two distinct types of consumers as regards utility, cost, and state transition. Across types, real-time chat and messaging, features of MySpace.com, positively affect the usage decision. Our counterfactuals simulate the effect of preventing coordination failure between users and their friends in a social network site and the effect of raising switching costs to lock users in to the site. The results show that `the bigger network' has double the effect of `the larger amount of chatting' on daily site usage after one year, consistent with the lock-in effect of a bigger network through the flow-on effects on social interactions in future periods. These simulations demonstrate that social network sites may adopt or modify our modeling approach in designing new site features.

원추형 패턴이 적용된 GaN-LED에서의 광 추출 효율 향상을 위한 전산모사

안대용,이삼녕,김근율,유영문 한국물리학회 2014 새물리 Vol.64 No.8

In this study, the light extraction efficiency of a GaN-light-emitting diode (LED) designed on a sapphire substrate was analyzed using an optical ray-tracing method. Truncated cone-shaped patterns (TCPs) on a sapphire substrate were applied to improve the light extraction efficiency. The shape of the optimized TCP was designed through simulation. As a result, the light extraction efficiency of a LED chip with a TCP applied was about twice that of the LED chip with no pattern. The light extraction efficiency was enhanced by increasing the density and decreasing the size of the pattern simultaneously, which mean that the higher the number of patterns per unit area, the better the light extraction efficiency. The improvement in the light extraction efficiency through the TCP was mostly due to the top surface because the light extraction efficiency of top surface was increased by more than 2.5 times. 기하 광학적 광선 추적 방법을 이용하여 사파이어 기판 위에 설계된 GaN-LED 구조에 대해 광 추출 효율을 분석해 보았다. 광 추출 효율을 높이고자 사파이어 기판 위쪽에 상측이 절단된 원추형 패턴을 적용하였다. 최적화된 원추형 패턴의 모양을 시뮬레이션을 통해 설계하고 그 효율을 분석한 결과 패턴이 없는 경우에 비해 광 추출 효율이 약 2배 가량 증가하였다. 또한 단위 면적당 패턴이 차지하는 밀도가 크고 동시에 패턴의 부피가 작을수록 효율이 증가함을 보였다. LED소자의 각 면에 따른 광 추출 효율 증가는 TCP (truncated cone-shape pattern)에 의해 윗면으로부터 크게 기인하고 있었다.

위암 374예의 원격성적에 대한 고찰

안대용(Dae Young Ahnn),이승도(Sung Do Lee),최경현(Kyong Hyon Choi),서재관(Jae Kwan Seo),박영훈(Young Hoon Park) 대한외과학회 1984 Annals of Surgical Treatment and Research(ASRT) Vol.27 No.1

개인 이동체의 탑승자 질량 변화에 강인한 선형 매개변수 가변 제어기법

안대용(Dae-Young An),강창묵(Chang Mook Kang) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11

Linear parameter varying(LPV) system can be effectively applied to control in an environment where parameters change. And linear quadratic regulator(LQR) controller is optimal controller in state-space model. In this paper, we propose a LPV controller for velocity control of personal mobility such as an electric wheelchair, which can be varying a wheelchair mass. We are modelling a wheelchair system using dynamics and kinematics and get an interpolation parameter vector by weighing a wheelchair mass. It can be optimized control strategy for the user`s weight using the LPV control system. To prove the effectiveness of the proposed method, a single LQR controller and LPV controller were compared and analyzed using MATLAB/Simulink. The proposed method has better control performance compared to a single LQR controller.