Seongmin Jeon - Academia.edu (original) (raw)

Papers by Seongmin Jeon

Tribology and Lubricants, 2010

An inter-propellant seal (IPS) for 75 ton class thrust turbopump was tested. Leakage characterist... more An inter-propellant seal (IPS) for 75 ton class thrust turbopump was tested. Leakage characteristics were presented with a given range of pressure difference under cryogenic as well as room temperature conditions. For cryogenic tests, liquid nitrogen was used as analogic fluid of liquid oxygen (LOX) while water was used instead of kerosene for room temperature condition. Test results showed that IPS had satisfactory leakage performance. Additionally endurance test was conducted to prove the life time of manufactured IPS and the tested IPS had successfully survived during required life time, 2100 seconds.

Proceedings of the 14th Annual International Conference on Electronic Commerce - ICEC '12, 2012

Massively Multiplayer Online Role Playing Game (MMORPG) has become a very popular business area t... more Massively Multiplayer Online Role Playing Game (MMORPG) has become a very popular business area to study as it represents new patterns of collaboration and social interaction in the virtual world. In this study, we empirically raise the issues of identity fraud in MMORPGs. In principle, the online game classification system controls the scope of users' activities with regard to the level of age appropriateness. However, the results from this study cast doubt on the effect of the current classification system in that distinctive behavior differences were not found to exist from one age group to another. Specifically, the econometric and multivariate analyses show that the behaviors of the group whose ages are around 40 is very similar to those of the group whose ages are under 14.

The renowned Pareto rule of 80/20 has been challenged in the electronic marketplace with the emer... more The renowned Pareto rule of 80/20 has been challenged in the electronic marketplace with the emergence of long tail economy. Mass customization on top of the Internet infrastructure is expected to explain these changes of product concentration. In this paper, we empirically analyzed the micro-transactional data of a Groupon-like daily deal web site to identify the changes of product and customer concentration. The results show the long tail pattern aligned with the previous research on the e-commerce literature on the long tail. We find that the notification setting on email or SMS about daily deal influences the patterns of sales concentration.

The objective of this study is to examine the effects of regulation policy on online gambling, an... more The objective of this study is to examine the effects of regulation policy on online gambling, an increasingly popular type of entertainment in the online game industry. Prior information systems (IS) studies on online game focus primarily on user behavior. However, there is a growing need to investigate the effects of regulation policy on dynamic changes of games or service providers instead of ad hoc heuristic approaches on individual behavior. Going beyond the approaches of previous studies, this study empirically tests the regulation policy effect with three theoretical perspectives: social influence, prior experience and perceived switching cost. A vector autoregression (VAR) methodology is used to forecast game usage and to model several patterns of the co-movement of online games. Evidence is also provided of strong Granger-causal interdependencies within games and service providers. This study provides one of the first empirical evidences that examine the effects of regulati...

Intentions influence behaviours and, consequently, individual and organizational outcomes. The ab... more Intentions influence behaviours and, consequently, individual and organizational outcomes. The ability to understand intentions becomes a central issue. The objective of this study was to present and test an Entrepreneurial Intentions (EI) model. Drawing on a generally utilized paradigm, the theory of planned behaviour and Shapiro’s model of the entrepreneurial event, we show the impact of individual and contextual factors on intention development. Relying on the Global Entrepreneurship Monitor (GEM) data, we test an EI conceptual model. The EI conceptual model is tested using the GEM dataset from over 30 countries and 3 subgroups. All the variables of interest indicate positive and significant effects on EI. Our results indicate that EI is influenced by perceived opportunity, perceived capability and government support and policy.

Internet Research, 2021

PurposeTo overcome the shortcomings of traditional industry classification systems such as the St... more PurposeTo overcome the shortcomings of traditional industry classification systems such as the Standard Industrial Classification Standard Industrial Classification, North American Industry Classification System North American Industry Classification System, and Global Industry Classification Standard Global Industry Classification Standard, the authors explore industry classifications using machine learning methods as an application of interpretable artificial intelligence (AI).Design/methodology/approachThe authors propose a text-based industry classification combined with a machine learning technique by extracting distinguishable features from business descriptions in financial reports. The proposed method can reduce the dimensions of word vectors to avoid the curse of dimensionality when measuring the similarities of firms.FindingsUsing the proposed method, the sample firms form clusters of distinctive industries, thus overcoming the limitations of existing classifications. The ...

Asia Pacific Journal of Information Systems, 2019

Sustainability, 2019

Do larger cities still suffer from higher crime rates? The scaling relationship between the numbe... more Do larger cities still suffer from higher crime rates? The scaling relationship between the number of crimes and the population size for the maximum of 758 cities with more than 50,000 inhabitants in the United States from 1999 to 2014 was analyzed. For the total group of cities, the relationship is superlinear for both violent and property crimes. However, for the subgroups of the top 12, top 24, and top 50 largest cities, the relationship changes to sublinear for both violent and property crimes. Results from the panel data analysis are in support of these findings. Along with population size, income per capita and population density also influence the outcome of crime counts. Implications from these findings will be discussed.

International Journal of Energy Technology and Policy, 2020

Projections of long-term wind-powered electricity by the Energy Information Administration in the... more Projections of long-term wind-powered electricity by the Energy Information Administration in the past may have been too conservative. We generate alternative projections for China, USA, India, Canada, Japan and South Korea, and compare them against the projections made by the Energy Information Administration (EIA) for the years 2020, 2030 and 2040. Although our projections are much higher than the EIA's for five of the countries, the exception being Japan, our projections are supported by several projections made by other organisations. Implications from our findings will be discussed.

International Journal of Energy Technology and Policy, 2019

Countries' energy intensity levels are known to converge at both global and regional levels. ... more Countries' energy intensity levels are known to converge at both global and regional levels. We test the convergence in energy intensity using a large recent dataset: a 151-country sample during the period of 1980-2010. In addition, time phase and income are examined to identify the factors that influence a country's aggregate level of energy intensity. With income time-phased analysis, we discovered a pronounced convergence during the period between 1980 and 1990 and then a moderate convergence later during the period. With the subgroup analysis, middle income yields the most rapid convergence. Furthermore, high income's negative role is so pervasive that non-convergence or divergence may take place.

Electronic Commerce Research and Applications, 2016

Popularity information is identified as one of the important factors for businesses in the online... more Popularity information is identified as one of the important factors for businesses in the online marketplace and is normally expected to strengthen sales performance. At the same time, the effects of popularity information are found to vary across product types. In this study, we attempt to identify the effects of popularity information on product sales through an analysis of the subgroups of category and price. Two sequential field experiments in an online apparel store on Alibaba's Tmall, the most dominant online brand marketplace in China, are conducted to capture the causal effects of the popularity information on sales. After observing the possible existence of popularity information effects through a pilot test of 17 products, we conduct the main experiment with 290 products, recording the daily sales for each by posting selected products on the hit list. The difference-indifferences method and propensity score matching are used to analyze the effects. The results show that once the products are displayed on the hit list, product sales increase by an average of 1.3 units per day. One subgroup of the niche product category is found to be influenced more significantly by hit list information than are other subgroups in the broad appeal category. Furthermore, after the hit list information is presented, more units of mid-price products are likely to be sold than units of products with high and low prices.

SSRN Electronic Journal, 2017

The world of the Internet is shaping the future of many industries around the world, from the air... more The world of the Internet is shaping the future of many industries around the world, from the airline industry to the production of music. The Internet is changing how we communicate and exchange ideas and thoughts. Many countries are now eager to setup master plans and policies to develop their Internet infrastructure. This paper examines the essential factors that are affecting the development and usage of the Internet in the developed and the developing world and shed light on the need to view the development and usage of the Internet on a more holistic view than atomistic view. The results show that urbanization, electrical usage, and the usage of mobile cellular have a positive relationship with Internet usage. In case of the least developed countries, GNI per capita has a positive relation of Internet usage.

Structures under high temperature may have creep behavior and fatigue behavior. Durability study ... more Structures under high temperature may have creep behavior and fatigue behavior. Durability study of the structures need the damage analysis with the creep-fatigue effects. In this paper, the damage analysis is studied for a turbine blade in the turbopump for a liquid rocket engine which is operated under high temperature condition. First of all, the load cycle is required for defining the operational characteristics of turbopump. The thermal stress analysis is done for a turbine blade of the turbopump. The stress analysis results are used to judge damage due to the creep and the fatigue. The strain-life method with miner rule is used for fatigue damage analysis. The Larson-Miller parameter master curve and robinson rule are used for the creep damage analysis. The linear damage summation method is used to consider creep-fatigue effects of turbopump turbine. Finally, the analysis results for fatigue and the influence are compared to figure out the damage phenomenon of the turbopump turbine.

Journal of Interactive Marketing, 2016

Shortly after Groupon started its business in 2008, selling one deal a day with substantial price... more Shortly after Groupon started its business in 2008, selling one deal a day with substantial price discounts, daily-deal sites became new online shopping places for many people. Starting with Groupon, most daily-deal sites required that voucher sales be higher than a predetermined number before deals become active. This feature, known as the "tipping point," was a unique characteristic of the daily-deal business and is identified as one of the most prominent features of social shopping. Most daily-deal sites also required that a redemption period start after a deal was over and be fixed, usually 90 days, presumably to maximize the promotional effect of deals by encouraging rapid voucher redemption. The question remains, however, whether such features actually contributed to the success of the daily-deal industry. Using individual-level panel data from a major dailydeal site in Korea, we analyze whether consumers' purchase and redemption behaviors were affected by these features and how consumers changed their behaviors as they continued to purchase and redeem vouchers over time. We find that the presence of the tipping point did not boost voucher sales and likely deterred new customers from buying deals right away. We also find that new customers tended to redeem their vouchers quickly, and this likely caused the small businesses that offered deals to become overwhelmed. It is not surprising, given our findings, that both Groupon and the Korean daily deal site abandoned the use of the tipping point and modified redemption rules.

Social Commerce sites are in vogue enough to be recognized as a new trend in online shopping aren... more Social Commerce sites are in vogue enough to be recognized as a new trend in online shopping arena. Social Commerce can be defined as the electronic commerce triggered by social media. It has been growing very rapidly with enormous discount rate, quality services and precise information. This research analyzes effects of posted numeric information on daily sales volumes. Hetrosckedasticity arises with the real transaction data that was acquired from TicketMonster which is one of the biggest Social Commerce sites in Korea. Therefore, GLS model was applied to have results that original price, discounted price, minimum quantity to have discounted price, and maximum units of sales are statistically significant. Minimum quantity of sales to meet the requirement to have discounted prices has threshold effect on the purchase of consumers like the ways they have group buying on the Internet. However, additional studies are required to identify if this correlated information can be results of reasonable estimates by the vendors and the intermediary or play a role of signal to attract sales. More research opportunities are addressed on services types, consumer groups and information richness.

SSRN Electronic Journal, 2014

A projection of future carbon emission is a vital input in influencing climate change for the wor... more A projection of future carbon emission is a vital input in influencing climate change for the world as well as for individual country and region. We provide alternative projections of future carbon dioxide emission and compare our projections with those from the International Energy Outlook report (2013) for seven countries and three region -- China, U.S., India, Japan, Brazil, South Korea, Canada, Europe and Eurasia, Middle East and Africa. For the projection methodology, we use kinked experience curve model. We find that the EIA’s projections are significantly lower than ours in nine countries and regions with the exception of Japan.

SSRN Electronic Journal, 2015

Among the recent attempts at developing a stable electronic payment system, Bitcoin is one of the... more Among the recent attempts at developing a stable electronic payment system, Bitcoin is one of the few that shows actual progress in establishing its status as real money. Despite the progress it is making, due to inherent price volatility and instability, Bitcoin is still considered as more of a speculative vehicle than a currency. The purpose of this paper is to determine the extent to which Bitcoin market is dominated by speculative investments. The paper studies arbitrage opportunities in Bitcoin and how the trading volume and the price of Bitcoin react to them. The results of the empirical analysis show the existence of a positive relationship between the arbitrage opportunities and both the Bitcoin trading volume and the Bitcoin price. The findings of the study contribute to the literature on the economic viability of Bitcoin and provide a base ground for discouraging short-term investors.