• Title/Summary/Keyword: Analysis of actual proof

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A Study of Storage Type Cooling and Heating System by Heat Pipe (히트파이프를 이용한 축열식 냉.난방 시스템에 관한 연구)

  • Kim, Seong-Sil;Harm, Seong-Chol;Lee, Yang-Ho;Choi, Byoung-Youn
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.3-8
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    • 2006
  • The heat pump system is attractive alternatives to conventional heating and cooling systems owing to their higher energy utilization efficiency. The thermal loads of commercial and institutional buildings are generally cooling-dominated. In this study have been developed ice storage type heat pump system for cooling and heating by heat pipe. This system was practiced performance test on evaluation criteria for heat storage systems. Accomplished the actual proof examination and looked into the performance of the system. In this study, measurement and analysis of ice storage type heat pump system for cooling and heating by heat pipe. The heat pump unit COP appears 3.05 for cooling and 4.20 for heating. As a result, the method to energy saving and to using a substitute energy actively that is heat pump cooling & heating system is expected by heat pipe. Thermal storage capacity appears $19.5RTH/m^3$ for cooling.

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The Impact of CEO's Values System and Employee's Awareness, Sympathy on Organizational Performance (최고경영자의 가치관과 구성원의 인식 공감이 기업성과에 미치는 영향)

  • Jo, Mi-Na;Lee, Dong-Hyun
    • Journal of Digital Convergence
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    • v.14 no.12
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    • pp.95-103
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    • 2016
  • This study is the analysis of actual proof about how the CEO's values system affects the organizational performance. To this end, we analyzed the content of forty different actual CEOs' values system through in-depth interviews. In addition, we verify the impact of the CEO's values system on organizational performances depending on the employee's awareness and sympathy. The organizational performance is analyzed in two different areas, social and financial performance, and significant results are obtained in both areas. In particular, we interview the CEOs directly, which is usually difficult to access, to analyze the values system and study the employee's awareness and sympathy for the values system. The Study puts emphasis on the importance of the process of achieving the employee's awareness and sympathy, rather than the values system contents itself. And it is necessary for verifying through much more company samples from further study.

The Influence of Service Scape and Service Provider's Esthetic Labor on Customer Behavioral Intentions and Mediations of Emotional Responses in Esthetic Shop (에스테틱샵의 서비스스케이프와 서비스 제공자의 미적노동이 고객행동의도에 미치는 영향과 감정반응의 매개효과)

  • Yoon, Sukhyun;Hwang, Hae Jung
    • Journal of Convergence for Information Technology
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    • v.10 no.8
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    • pp.250-258
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    • 2020
  • This study analyzes service scape and esthetic labor, emotional reaction, coustomer behavior intention that impacts skincare coustomers' behaviors and extracts relationships of cause and effects. Using 280 surveys were conducted to estheic shop visitors in Ulsan and Geyongnam area in recent 3 months. Using 257 surveys out of the 280 surveys, the writer did actual proof analysis. The data sample is analyzed in multiple regression analysis using Statistical power analysis with 2.1 analysis. Then the statistical processing is done with SPSS 21.0 and AMOS 21.0. It is proven that customer satisfactions from that positive reactions also increase revisit intentions by creating positive ripple effects. Through discoveries of structural relationships of predisposing factors of satisfactions in esthetic and revisit intentions, this study extracts scholastic and operational implications to have positive impacts. Expanded analysis is required in further researches with consideration of various age group and regional targets.

Bird Strike Analysis of Radome Using Smoothed Particle Hydrodynamics Technique (입자완화 유체동역학 기법을 이용한 레이돔 조류충돌해석)

  • Yun, Gangsik;Kim, Youngjin;Kim, Moon-soo;Kim, Jihyeon;Kim, Taehyeong;Yoon, Siyoung;Park, Sungkyun;Seo, Won-gu;Oh, Dongho
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.6
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    • pp.743-751
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    • 2017
  • To evaluate the structural integrity of the helicopter radome, we performed bird strike analysis using SPH (Smoothed Particle Hydrodynamics) technique. Since the SPH method is a meshfree method, there is no phenomenon such as mesh tangling and it is suitable to predict the dispersion behavior of debris and debris cloud generated by high-speed impact. In order to observe the scattering direction of fractured bolts, the analysis were performed under the condition that the fracture occurs at the proof load. As a result of bird strike analysis, there is no secondary damage as well as the damage due to, the dispersion behavior of the bird model, and the scattering of the fractured bolts and radome. From the additional analysis that were performed to determine the actual bolt fracture, only plastic deformation is predicted since the maximum stress of the bolt does not exceed the ultimate stress.

Energy Use Prediction Model in Digital Twin

  • Wang, Jihwan;Jin, Chengquan;Lee, Yeongchan;Lee, Sanghoon;Hyun, Changtaek
    • International conference on construction engineering and project management
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    • 2022.06a
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    • pp.1256-1263
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    • 2022
  • With the advent of the Fourth Industrial Revolution, the amount of energy used in buildings has been increasing due to changes in the energy use structure caused by the massive spread of information-oriented equipment, climate change and greenhouse gas emissions. For the efficient use of energy, it is necessary to have a plan that can predict and reduce the amount of energy use according to the type of energy source and the use of buildings. To address such issues, this study presents a model embedded in a digital twin that predicts energy use in buildings. The digital twin is a system that can support a solution of urban problems through the process of simulations and analyses based on the data collected via sensors in real-time. To develop the energy use prediction model, energy-related data such as actual room use, power use and gas use were collected. Factors that significantly affect energy use were identified through a correlation analysis and multiple regression analysis based on the collected data. The proof-of-concept prototype was developed with an exhibition facility for performance evaluation and validation. The test results confirm that the error rate of the energy consumption prediction model decreases, and the prediction performance improves as the data is accumulated by comparing the error rates of the model. The energy use prediction model thus predicts future energy use and supports formulating a systematic energy management plan in consideration of characteristics of building spaces such as the purpose and the occupancy time of each room. It is suggested to collect and analyze data from other facilities in the future to develop a general-purpose energy use prediction model.

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An Empirical Study on the Determinants of Korean FDI focused on China& Asean six Countries for years 2016 through 2019 (한국 기업의 해외직접투자 모형설정에 관한 실증 연구(중국&아세안6개국 중심:2016년-2019년 중심))

  • Lee eung kweon
    • Korea Trade Review
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    • v.46 no.1
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    • pp.1-21
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    • 2021
  • The main purpose of this research is to analyze the changes in investment motivation by year through time series and cross-sectional analysis of the factors and investment decisions of Korean manufacturing companies. According to the investment pattern for Asean from the 1980s to the 19th, the first expansion period was 82 to 86, the average increase in overseas investment for securing foreign raw materials due to the second oil shock, and the second expansion period was a gradual increase in exports to the U.S. in 1987 to 1996. During the first stagnation period, direct investment in Asean stagnated in the aftermath of the 1998-05 Asian crisis, and in the third expansion period, part of the production facilities invested in China were relocated to Asean, increasing Asean's investment to become Korea's largest manufacturing investment in 17. Korea's proportion of investment in Asean surpassed that of mass investment since 10 years ago, and the proportion of investment in manufacturing sector has been transferred from China to Asean, and after 17 years, it has served as an overseas production base connecting China. As such, The main purpose of the research will be to extract the determinant factors and key factors for overseas direct investment and investment patterns in conjunction with global manufacturing companies' production base relocation and investment trends through empirical analysis. This research paper gave basic reference to the motivation and determinant of investment 16 years ago, and analyzed the changes in investment motivation by year and content through empirical analysis, contributing some reasonable purpose to the decision of companies and policy makers interested in overseas direct investment.

Influence Analysis of Determinants on Member's Payment in Urban Renewal Project (도시정비사업에서 조합원 입주부담금 결정요인의 영향력 분석)

  • Kim, Seong-Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.11
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    • pp.7690-7697
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    • 2015
  • This study is to reveal structural causal relationship of individual factors influencing association member's substantive payment in the economic view which is a critical factor of project implementation and identify its influence through simulation and actual proof analysis. As the results of analysis, the first, association member's substantive payment is decided to allow for the difference between special price for association members and general price and the profit arising between the time of approval of disposal plan and moving in. The second, on analysis of sensitivity of individual factors influencing association member's substantive payment, floor area ratio applied to project has the biggest influence. Association member's payment is also greatly influenced by the subject of cost allocation for establishing infrastructure in project area. The third, this study set up a structure model based on causal relationship among the factors deciding association member's payment and empirically examined influence and path of influence which the individual factors exercise. The result indicates that control elements and regional characteristic elements influence association member's payment through the medium of plan elements.

Simulator Design and Performance Analysis of BADA Distributed Consensus Algorithm (BADA 분산합의 알고리즘 시뮬레이터 설계 및 성능 분석)

  • Kim, Young Chang;Kim, Kiyoung;Oh, Jintae;Kim, Do Gyun;Choi, Jin Young
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.43 no.4
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    • pp.168-177
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    • 2020
  • In recent years, importance of blockchain systems has been grown after success of bitcoin. Distributed consensus algorithm is used to achieve an agreement, which means the same information is recorded in all nodes participating in blockchain network. Various algorithms were suggested to resolve blockchain trilemma, which refers conflict between decentralization, scalability, security. An algorithm based on Byzantine Agreement among Decentralized Agents (BADA) were designed for the same manner, and it used limited committee that enables an efficient consensus among considerable number of nodes. In addition, election of committee based on Proof-of-Nonce guarantees decentralization and security. In spite of such prominence, application of BADA in actual blockchain system requires further researches about performance and essential features affecting on the performance. However, performance assessment committed in real systems takes a long time and costs a great deal of budget. Based on this motivation, we designed and implemented a simulator for measuring performance of BADA. Specifically, we defined a simulation framework including three components named simulator Command Line Interface, transaction generator, BADA nodes. Furthermore, we carried out response surface analysis for revealing latent relationship between performance measure and design parameters. By using obtained response surface models, we could find an optimal configuration of design parameters for achieving a given desirable performance level.

The Effects of the Previous Corporate Internal Reservation on the Current Dividend Rate - Using LEV as a moderating variable & Verification through DRF & GBM model (법인의 전기 사내유보가 당기 배당률에 미치는 영향 부채비율의 조절변수 효과 및 DRF & GBM 모델을 통한 검증)

  • Yoo, Joon-Soo;Jeong, Jae-Yeon
    • Journal of the Korea Convergence Society
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    • v.8 no.10
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    • pp.215-223
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    • 2017
  • This article has tried to analyse the effect of the corporate earning return tax empirically through analysis on the impact of previous internal reservation on the dividends rate of the current year. In addition to this, this article has tried to the effectiveness of government policies with leverage ratio as a moderating variable. Moreover, DRF and GBM model were used to see the effect again. As a result of the actual proof analysis, OCF, ROE, FOR have a significance level of 99% in model1, model2, model3. However, ADV and MSE has appeared not to be meaningful in all models. In the result of DRF and GBM model for convergence was higher than GBM in depth and leaves. However, when it comes to a model explaining capability, GBM high than DRF. The further study will be required to examine the effect of government policy by time series analysis in the period of enforcement of the reflux tax, from 2015 to 2017.

LBS 응용 모바일 서비스의 사용 요인에 관한 실증적 연구

  • Im, Gi-Heung
    • 한국디지털정책학회:학술대회논문집
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    • 2005.06a
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    • pp.107-143
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    • 2005
  • Mobile service that geography, position by development of space Information Technology and technology of communications, space are various to us now becoming limelight as point contents and infra information that customers do demand based on radio superhigh speed authentication net on highly information society by offer infringement problem about individual's privacy or information by political and scientific interest be injured. Purpose of this study grasps use factor of LBS application Mobile service, and it is that analyze actual proof through questionnaire to grasp whether some relation is with value and action determination that is felt of LBS application Mobile service. Distributed all question of 190 copies but disk floret inclination did valid data 171 that clear question and omission remove a lot of questions by type of study among questionnaire of collected 182 wealths. Analyzed factor analysis and authoritativeness to search validity and confidence of questionnaire and used single regression analysis and multiple regression analysis for hypothetical verification. According to verification result, Mobile service that apply position base service usefulness and system quality, adaptedness of Mobile service that apply position base service by leading person affecting in use, acted for connection healthy and felt value is important factor immediately. Usability and social effect, felt expense, privacy did not appear by leading person that keep in mind in this study. Is been related with step that Mobile service that apply position base service is placed. That is, as present childhood, a person who have experience that use service to look for friend is few and usability fairly in last in wide application boundary and this very important person was removed finally in model. This study has sense in terms of study systematically about LBS application service use leading person that is getting into the spotlight worldwide among Mobile service that is injured newly.

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