• Title/Summary/Keyword: 기업데이터 분석

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A Deep Learning Model to Predict BIM Execution Difficulty Based on Bidding Texts in Construction Projects (건설사업 입찰 텍스트의 BIM 수행 난이도 추론을 위한 딥러닝 모델)

  • Kim, Jeongsoo;Moon, Hyounseok;Park, Sangmi
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.43 no.6
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    • pp.851-863
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    • 2023
  • The mandatory use of BIM(Building Information Model) in larger Korean public construction projects necessitates participants to have a comprehensive understanding of the relevant procedures and technologies, especially during the bidding stage. However, most small and medium-sized construction and engineering companies possess limited BIM proficiency and understanding. This hampers their ability to recognize bidding requirements and make informed decisions. To address this challenge, our study introduces a method to gauge the complexity of BIM requirements in bidding documents. This is achieved by integrating a morphological analyzer, which encompasses BIM bidding terminology, with a deep learning model. We investigated the effects of the parameters in our proposed deep learning model and examined its predictive validity. The results revealed an F1-score of 0.83 for the test data, indicating that the model's predictions align closely with the actual BIM performance challenges.

Vulnerability Analysis of Remote Multi-Server User Authentication System Based on Smart Card and Dynamic ID (스마트 카드 및 동적 ID 기반 멀티서버 원격 사용자 인증 프로토콜의 취약점 분석)

  • Kwon Soon Hyung;Byeon Hae won;Choi Youn Sung
    • Convergence Security Journal
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    • v.23 no.4
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    • pp.43-52
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    • 2023
  • Many businesses and organizations use smartcard-based user authentication for remote access. In the meantime, through various studies, dynamic ID-based remote user authentication protocols for distributed multi-server environments have been proposed to protect the connection between users and servers. Among them, Qiu et al. proposed an efficient smart card-based remote user authentication system that provides mutual authentication and key agreement, user anonymity, and resistance to various types of attacks. Later, Andola et al. found various vulnerabilities in the authentication scheme proposed by Qiu et al., and overcame the flaws in their authentication scheme, and whenever the user wants to log in to the server, the user ID is dynamically changed before logging in. An improved authentication protocol is proposed. In this paper, by analyzing the operation process and vulnerabilities of the protocol proposed by Andola et al., it was revealed that the protocol proposed by Andola et al. was vulnerable to offline smart card attack, dos attack, lack of perfect forward secrecy, and session key attack.

Analysis and Utilization of Housing Information based on Open API and Web Scraping (오픈API와 웹스크래핑에 기반한 주택정보 분석 및 활용방안)

  • Shin-Hyeong Choi
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.17 no.5
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    • pp.323-329
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    • 2024
  • In an era of low interest rates around the world, interest in real estate has increased. We can collect real estate information using the Internet, but it takes a lot of time to find. In this paper, real estate information from January 2015 to April 2024 is collected from three places to help users more easily collect real estate information of interest and use it for sales. First, by analyzing HTML documents using web scraping techniques, information on real estate of interest is automatically extracted from the website of the platform company. Second, the actual transaction price of the real estate is additionally collected through the open API provided by the Ministry of Land, Infrastructure and Transport. Third, real estate-related news is provided so that users can learn about the future value and prospects of real estate. The simulation results for the data collected in this study show that the lowest price predicted by the ARIMA model is expected to be in May 2024 among the next eight months. Therefore, by following this procedure, real estate buyers can make more efficient home sales by referring to related information including the predicted transaction price.

Analysis of the Relationship Between Freight Index and Shipping Company's Stock Price Index (해운선사 주가와 해상 운임지수의 영향관계 분석)

  • Kim, Hyung-Ho;Sung, Ki-Deok;Jeon, Jun-woo;Yeo, Gi-Tae
    • Journal of Digital Convergence
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    • v.14 no.6
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    • pp.157-165
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    • 2016
  • The purpose of this study was to analyze the effect of the shipping industry real economy index on the stock prices of domestic shipping companies. The parameters used in this analysis were the stock price of H Company in South Korea and shipping industry real economy indices including BDI, CCFI and HRCI. The period analysis was from 2012 to 2015. The weekly data for four years of the stock price index of shipping companies, BDI, CCFI, and HRCI were used. The effects of CCFI and HRCI on the stock price index of domestic shipping companies were analyzed using the VAR model, and the effects of BDI on the stock price index of domestic shipping companies were analyzed using the VECM model. The VAR model analysis results showed that CCFI and HRCI had negative effects on the stock price index, and the VECM model analysis results showed that BDI also had a negative effect on the stock price index.

An Empirical Analysis of Accelerator Investment Determinants: A Longitudinal Study on Investment Determinants and Investment Performance (액셀러레이터 투자결정요인 실증 분석: 투자결정요인과 투자성과에 대한 종단 연구)

  • Jin Young Joo;Jeong Min Nam
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.18 no.4
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    • pp.1-20
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    • 2023
  • This study attempted to identify the relationship between the investment determinants of accelerators and investment performance through empirical analysis. Through literature review, four dimensions and 12 measurement items were extracted for investment determinants, which are independent variables, and investment performance was adjusted to the cumulative amount of subsequent investment based on previous studies. Performance data from 594 companies selected by TIPS from 2017 to 2019, which are relatively reliable and easy to secure data, were collected, and the subsequent investment cumulative attraction amount, which is a dependent variable, was hypothesized through multiple regression analysis three years after the investment. As a result of the study, 'industrial experience years' in the characteristics of founders, 'market size', 'market growth', 'competitive strength', and 'number of patents' in the characteristics of products and services had a significant positive (+) effect. The impact of independent variables on dependent variables was most influenced by the competitive strength of market characteristics, followed by the number of years of industrial experience, the number of patents, the size of the market, and market growth. This was different from the results of previous studies conducted mainly on qualitative research methods, and in most previous studies, the characteristics of founders were the most important, but the empirical analysis results were market characteristics. As a sub-factor, the intensity of competition, which was the subordinate to the importance of previous studies, had the greatest influence in empirical analysis. The academic significance of this study is that it presented a specific methodology to collect and build 594 empirical samples in the absence of empirical research on accelerator investment determinants, and created an opportunity to expand the theoretical discussion of investment determinants through causal research. In practice, the information asymmetry and uncertainty of startups that accelerators have can help them make effective investment decisions by establishing a systematic model of experience-dependent investment determinants.

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Export Prediction Using Separated Learning Method and Recommendation of Potential Export Countries (분리학습 모델을 이용한 수출액 예측 및 수출 유망국가 추천)

  • Jang, Yeongjin;Won, Jongkwan;Lee, Chaerok
    • Journal of Intelligence and Information Systems
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    • v.28 no.1
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    • pp.69-88
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    • 2022
  • One of the characteristics of South Korea's economic structure is that it is highly dependent on exports. Thus, many businesses are closely related to the global economy and diplomatic situation. In addition, small and medium-sized enterprises(SMEs) specialized in exporting are struggling due to the spread of COVID-19. Therefore, this study aimed to develop a model to forecast exports for next year to support SMEs' export strategy and decision making. Also, this study proposed a strategy to recommend promising export countries of each item based on the forecasting model. We analyzed important variables used in previous studies such as country-specific, item-specific, and macro-economic variables and collected those variables to train our prediction model. Next, through the exploratory data analysis(EDA) it was found that exports, which is a target variable, have a highly skewed distribution. To deal with this issue and improve predictive performance, we suggest a separated learning method. In a separated learning method, the whole dataset is divided into homogeneous subgroups and a prediction algorithm is applied to each group. Thus, characteristics of each group can be more precisely trained using different input variables and algorithms. In this study, we divided the dataset into five subgroups based on the exports to decrease skewness of the target variable. After the separation, we found that each group has different characteristics in countries and goods. For example, In Group 1, most of the exporting countries are developing countries and the majority of exporting goods are low value products such as glass and prints. On the other hand, major exporting countries of South Korea such as China, USA, and Vietnam are included in Group 4 and Group 5 and most exporting goods in these groups are high value products. Then we used LightGBM(LGBM) and Exponential Moving Average(EMA) for prediction. Considering the characteristics of each group, models were built using LGBM for Group 1 to 4 and EMA for Group 5. To evaluate the performance of the model, we compare different model structures and algorithms. As a result, it was found that the separated learning model had best performance compared to other models. After the model was built, we also provided variable importance of each group using SHAP-value to add explainability of our model. Based on the prediction model, we proposed a second-stage recommendation strategy for potential export countries. In the first phase, BCG matrix was used to find Star and Question Mark markets that are expected to grow rapidly. In the second phase, we calculated scores for each country and recommendations were made according to ranking. Using this recommendation framework, potential export countries were selected and information about those countries for each item was presented. There are several implications of this study. First of all, most of the preceding studies have conducted research on the specific situation or country. However, this study use various variables and develops a machine learning model for a wide range of countries and items. Second, as to our knowledge, it is the first attempt to adopt a separated learning method for exports prediction. By separating the dataset into 5 homogeneous subgroups, we could enhance the predictive performance of the model. Also, more detailed explanation of models by group is provided using SHAP values. Lastly, this study has several practical implications. There are some platforms which serve trade information including KOTRA, but most of them are based on past data. Therefore, it is not easy for companies to predict future trends. By utilizing the model and recommendation strategy in this research, trade related services in each platform can be improved so that companies including SMEs can fully utilize the service when making strategies and decisions for exports.

Investigation on Economical Feasibility for Energy Business of Waste Water Sludge Discharged in 'A' Industrial Complex (A-산업단지 발생 슬러지의 에너지화를 위한 경제성 검토)

  • Byun, Jung-Joo;Lee, Kang-Soo;Phae, Chae-Gun
    • Journal of the Korea Organic Resources Recycling Association
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    • v.20 no.4
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    • pp.61-74
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    • 2012
  • Industrial complexes in Korea have been vigorously established by economic development plan and development policy of industry in 1960s. Recently, Korean government has promoted Eco Industrial Park (EIP) project to recycle by-products and wastes in industrial park In this study, we analyzed the physical and chemical properties for the sludges discharged from A industrial complex. And we investigated the economic feasibility and environmental impact of sludge to energy facilities. The analysis results indicated that the petrochemical industry were 92% in sludge production, the highest treatment amount was landfill, followed by incineration and recycling and then ocean disposal. Wastewater sludge and process sludge samples are collected and analyzed to use as basic data on economic feasibility and environmental impact. Weighted average heating value of sludge samples was 3,891kcal/kg. Based on this data, installation and operation costs, operation returns of operating the drying facility are estimated, compared with cogeneration facility. And this study examines how the payback period of each simulation(total 8 case) with the important parameter changes. As a result, it was found that what needs the shortest payback period is 3years with connection of drying facility and cogeneration facility based on the government's financial subsidy system.

Intermediate-Representation Translation Techniques to Improve Vulnerability Analysis Efficiency for Binary Files in Embedded Devices (임베디드 기기 바이너리 취약점 분석 효율성 제고를 위한 중간어 변환 기술)

  • Jeoung, Byeoung Ho;Kim, Yong Hyuk;Bae, Sung il;Im, Eul Gyu
    • Smart Media Journal
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    • v.7 no.1
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    • pp.37-44
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    • 2018
  • Utilizing sequence control and numerical computing, embedded devices are used in a variety of automated systems, including those at industrial sites, in accordance with their control program. Since embedded devices are used as a control system in corporate industrial complexes, nuclear power plants and public transport infrastructure nowadays, deliberate attacks on them can cause significant economic and social damages. Most attacks aimed at embedded devices are data-coded, code-modulated, and control-programmed. The control programs for industry-automated embedded devices are designed to represent circuit structures, unlike common programming languages, and most industrial automation control programs are designed with a graphical language, LAD, which is difficult to process static analysis. Because of these characteristics, the vulnerability analysis and security related studies for industry automation control programs have only progressed up to the formal verification, real-time monitoring levels. Furthermore, the static analysis of industrial automation control programs, which can detect vulnerabilities in advance and prepare for attacks, stays poorly researched. Therefore, this study suggests a method to present a discussion on an industry automation control program designed to represent the circuit structure to increase the efficiency of static analysis of embedded industrial automation programs. It also proposes a medium term translation technology exploiting LLVM IR to comprehensively analyze the industrial automation control programs of various manufacturers. By using LLVM IR, it is possible to perform integrated analysis on dynamic analysis. In this study, a prototype program that converts to a logical expression type of medium language was developed with regards to the S company's control program in order to verify our method.

A Visual Analysis on Factors Affecting Repurchase Intention in Social Commerce - Focused on Group-buying Social Commerce - (소셜커머스 재이용의도에 영향을 미치는 요인에 관한 시각화 분석 - 공동구매형 소셜커머스를 중심으로 -)

  • Mun, Seong Min;Han, Hyun Woo;Ha, Hyo Ji;Lee, Kyung Won
    • Design Convergence Study
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    • v.13 no.6
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    • pp.137-152
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    • 2014
  • In considering the overheated competition amongst social commerce, it is imperative to determine which parts of the social commerce service are considered important by consumers, and which parts need improvements to sustain relationship between consumers and the corporation. Therefore, this research has identified the motives for usages of consumers as affordability, convenience, information acquisition, pleasure, and sociability, and set satisfaction as a factor that works as a medium between previously mentioned motives and willingness to repurchase to identify factors that affect willingness to repurchase and factors that affect positively. Additionally, to identify significant results that have not been identified in statistical analysis. The experiment was conducted on those who have experienced purchase on social commerce or are currently using social commerce. The survey was created based on prior research, and has representativeness as a sample were conducted empirical analysis and visualization analysis. As the research result, the result that satisfaction causes are in close relationship with causes for repurchase, and affordability has the most positive effect among the five motives for usage were deducted, and the conclusion that the relationship among data are easily deducted when statistic analysis and visual analysis are carried out at the same time was postulated.

The Improvement Plan for Indicator System of Personal Information Management Level Diagnosis in the Era of the 4th Industrial Revolution: Focusing on Application of Personal Information Protection Standards linked to specific IT technologies (제4차 산업시대의 개인정보 관리수준 진단지표체계 개선방안: 특정 IT기술연계 개인정보보호기준 적용을 중심으로)

  • Shin, Young-Jin
    • Journal of Convergence for Information Technology
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    • v.11 no.12
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    • pp.1-13
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    • 2021
  • This study tried to suggest ways to improve the indicator system to strengthen the personal information protection. For this purpose, the components of indicator system are derived through domestic and foreign literature, and it was selected as main the diagnostic indicators through FGI/Delphi analysis for personal information protection experts and a survey for personal information protection officers of public institutions. As like this, this study was intended to derive an inspection standard that can be reflected as a separate index system for personal information protection, by classifying the specific IT technologies of the 4th industrial revolution, such as big data, cloud, Internet of Things, and artificial intelligence. As a result, from the planning and design stage of specific technologies, the check items for applying the PbD principle, pseudonymous information processing and de-identification measures were selected as 2 common indicators. And the checklists were consisted 2 items related Big data, 5 items related Cloud service, 5 items related IoT, and 4 items related AI. Accordingly, this study expects to be an institutional device to respond to new technological changes for the continuous development of the personal information management level diagnosis system in the future.