• 제목/요약/키워드: Empirical modelling

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금융역량과 자아존중감 그리고 금전관계 문제의 관계 분석: 지역사회복지기관 이용자를 중심으로 (The Relationships among Financial Capability, Self-esteem and Money Relationship: Focusing on Community Center Users)

  • 장동호
    • 예술인문사회 융합 멀티미디어 논문지
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    • 제5권4호
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    • pp.397-404
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    • 2015
  • 이 연구는 지역사회복지기관 이용자를 중심으로 금융역량과 자아존중감 그리고 금전관계의 관계를 탐색하였다. 경험적 분석을 위해 서울, 경기, 충남의 지역사회복지관 및 지역자활센터 이용자 총 429명을 대상으로 설문조사를 실시하였다. 빈도분석과 구조방정식모형을 활용하여 분석을 수행하였으며, 주요 분석결과는 다음과 같다. 첫째, 소득수준이 지역사회복지기관 이용자의 자아존중감에 미치는 영향은 통계적으로 유의미하지 않았다. 둘째, 금융역량이 높을수록 자아존중감이 높았다. 셋째, 금전관계 문제가 심각할수록 자아존중감은 낮았다. 넷째, 금융역량이 자아존중감에 미치는 영향을 금전관계 문제가 부분적으로 매개했다.

A study on development of simulation model of Underwater Acoustic Imaging (UAI) system with the inclusion of underwater propagation medium and stepped frequency beam-steering acoustic array

  • L.S. Praveen;Govind R. Kadambi;S. Malathi;Preetham Shankpal
    • Ocean Systems Engineering
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    • 제13권2호
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    • pp.195-224
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    • 2023
  • This paper proposes a method for the acoustic imaging wherein the traditional requirement of the relative movement between the transmitter and target is overcome. This is facilitated through the beamforming acoustic array in the transmitter, in which the target is illuminated by the array at various azimuth and elevation angles without the physical movement of the acoustic array. The concept of beam steering of the acoustic array facilitates the formation of the beam at desired angular positions of azimuth and elevation angles. This paper substantiates that the combination of illumination of the target from different azimuth and elevation angles with respect to the transmitter (through the beam steering of beam forming acoustic array) and the beam steering at multiple frequencies (through SF) results in enhanced reconstruction of images of the target in the underwater scenario. This paper also demonstrates the possibility of reconstruction of the image of a target in underwater without invoking the traditional algorithms of Digital Image Processing (DIP). This paper comprehensively and succinctly presents all the empirical formulae required for modelling the acoustic medium and the target to facilitate the reader with a comprehensive summary document incorporating the various parameters of multi-disciplinary nature.

A hybrid approach to predict the bearing capacity of a square footing on a sand layer overlying clay

  • Erdal Uncuoglu;Levent Latifoglu;Zulkuf Kaya
    • Geomechanics and Engineering
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    • 제34권5호
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    • pp.561-575
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    • 2023
  • This study investigates to provide a fast solution to the problem of bearing capacity in layered soils with easily obtainable parameters that does not require the use of any charts or calculations of different parameters. Therefore, a hybrid approach including both the finite element (FE) method and machine learning technique have been applied. Firstly, a FE model has been generated which is validated by the results of in-situ loading tests. Then, a total of 192 three-dimensional FE analyses have been performed. A data set has been created utilizing the soil properties, footing sizes, layered conditions used in the FE analyses and the ultimate bearing capacity values obtained from the FE analyses to be used in multigene genetic programming (MGGP). Problem has been modeled with five input and one output parameter to propose a bearing capacity formula. Ultimate bearing capacity values estimated from the proposed formula using data set consisting of 20 data independent of total data set used in MGGP modelling have been compared to the bearing capacities calculated with semi-empirical methods. It was observed that the MGGP method yielded successful results for the problem considered. The proposed formula provides reasonable predictions and efficient enough to be used in practice.

'Knowing' with AI in construction - An empirical insight

  • Ramalingham, Shobha;Mossman, Alan
    • 국제학술발표논문집
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    • The 9th International Conference on Construction Engineering and Project Management
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    • pp.686-693
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    • 2022
  • Construction is a collaborative endeavor. The complexity in delivering construction projects successfully is impacted by the effective collaboration needs of a multitude of stakeholders throughout the project life-cycle. Technologies such as Building Information Modelling and relational project delivery approaches such as Alliancing and Integrated Project Delivery have developed to address this conundrum. However, with the onset of the pandemic, the digital economy has surged world-wide and advances in technology such as in the areas of machine learning (ML) and Artificial Intelligence (AI) have grown deep roots across specializations and domains to the point of matching its capabilities to the human mind. Several recent studies have both explored the role of AI in the construction process and highlighted its benefits. In contrast, literature in the organization studies field has highlighted the fear that tasks currently done by humans will be done by AI in future. Motivated by these insights and with the understanding that construction is a labour intensive sector where knowledge is both fragmented and predominantly tacit in nature, this paper explores the integration of AI in construction processes across project phases from planning, scheduling, execution and maintenance operations using literary evidence and experiential insights. The findings show that AI can complement human skills rather than provide a substitute for them. This preliminary study is expected to be a stepping stone for further research and implementation in practice.

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Characterizing and modelling nonstationary tri-directional thunderstorm wind time histories

  • Y.X. Liu;H.P. Hong
    • Wind and Structures
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    • 제38권4호
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    • pp.277-293
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    • 2024
  • The recorded thunderstorm winds at a point contain tri-directional components. The probabilistic characteristics of such recorded winds in terms of instantaneous mean wind speed and direction, and the probability distribution and the time-frequency dependent crossed and non-crossed power spectral density functions for the high-frequency fluctuating wind components are unclear. In the present study, we analyze the recorded tri-directional thunderstorm wind components by separating the recorded winds in terms of low-frequency time-varying mean wind speed and high-frequency fluctuating wind components in the alongwind direction and two orthogonal crosswind directions. We determine the time-varying mean wind speed and direction defined by azimuth and elevation angles, and analyze the spectra of high-frequency wind components in three orthogonal directions using continuous wavelet transforms. Additionally, we evaluate the coherence between each pair of fluctuating winds. Based on the analysis results, we develop empirical spectral models and lagged coherence models for the tri-directional fluctuating wind components, and we indicate that the fluctuating wind components can be treated as Gaussian. We show how they can be used to generate time histories of the tri-directional thunderstorm winds.

An NLP-based Mixed-method Approach to Explore the Impact of Gratifications and Emotions on the Acceptance of Amazon Go

  • Arghya Ray;Subhadeep Jana;Nripendra P. Rana
    • Asia pacific journal of information systems
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    • 제33권3호
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    • pp.541-572
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    • 2023
  • Amazon Go is a cashierless convenience store concept, which is seen as a disruption in the grocery retail segment. Although Amazon Go has the ability to disrupt the retail segment, there are speculations on how Amazon Go will be perceived by users. Existing studies have not utilized user-generated content to understand the factors that affect customer behaviour in case of Amazon Go. Additionally, in case of phygital retail, studies have not attempted at understanding the effect of emotions and gratifications on user behaviour. To address the gap of exploring user perspectives based on their experience, we have examined the impact of gratifications and emotions on the acceptance of phygital retail using user-generated-content. A mixed-method approach has been utilized using only user-generated content. Utilizing topic-modelling based content analysis and emotion analysis on 30 articles related to Amazon Go, we found themes like, convenience, technology, experience, personalization, enjoyment and emotions like, bad, good, annoyance, success. In the empirical analysis, we have utilized 522 reviews about Amazon Go from the cognition and emotion theory stance, and found that hedonic gratifications have a positive impact on challenge emotions. We also found a significant impact of emotions on customer's favourite behaviour.

가치 일치성, 가격 공정성, 서비스 품질이 사회적 기업의 고객 성과에 미치는 영향 (Effects of Value Congruence, Price Fairness, and Service Quality on Customer Performance in Social Enterprises)

  • 이윤재;김병수
    • 디지털융복합연구
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    • 제18권6호
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    • pp.197-208
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    • 2020
  • 사회적 기업의 지속가능한 성장을 위해서는 사회적 문제 해결뿐만 아니라 지속적 수익 창출도 병행되어야 한다. 본 연구에서는 사회적 기업이 고객과 장기적 관계를 유지할 수 있는 고객 성과에 초점을 두었으며, 고객 신뢰, 고객 만족, 고객 충성도를 고객 성과의 주요 요인으로 고려하였다. 그리고 고객 성과에 영향을 미치는 요인으로 사회적 기업과 고객 간의 가치 일치성, 가격 공정성, 서비스품질을 도출하였다. 대구광역시 동구에서 운영하는 사회적 기업을 이용한 소비자 204명을 대상으로 연구 모형을 분석하였다. 연구 모형 분석 결과 사회적 기업에 대한 고객 만족은 고객 신뢰와 고객 충성도에 긍정적 영향을 미쳤으며, 고객 신뢰도 고객 충성도에 긍정적 영향을 미쳤다. 사회적 기업이 추구하는 가치와 고객이 추구하는 가치의 일치성이 높을 때, 고객 신뢰와 고객 만족이 향상됨을 확인하였다. 그리고 서비스 품질도 고객 신뢰와 고객 만족 형성의 핵심 요인임을 알 수 있었다. 하지만, 가격 공정성은 고객 만족에 긍정적 영향을 미쳤지만, 고객 신뢰에는 부정적 영향을 미쳤다. 본 연구 결과를 바탕으로 사회적 기업이 제공하는 제품이나 서비스에 대한 소비자들의 구매 의사 결정 매커니즘을 이해하는데 도움을 줄 수 있을 것이다.

A large scale simulation of floe-ice fractures and validation against full-scale scenario

  • Lu, Wenjun;Heyn, Hans-Martin;Lubbad, Raed;Loset, Sveinung
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제10권3호
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    • pp.393-402
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    • 2018
  • While interacting with a sloping structure, an ice floe may fracture in different patterns. For example, it can be local bending failure or global splitting failure depending on the contact properties, geometry and confinement of the ice floe. Modelling these different fracture patterns as a natural outcome of numerical simulations is rather challenging. This is mainly because the effects of crack propagation, crack branching, multi fracturing modes and eventual fragmentation within a solid material are still questions to be answered by the on-going research in the Computational Mechanic community. In order to simulate the fracturing of ice floes with arbitrary geometries and confinement; and also to simulate the fracturing events at such a large scale yet with sufficient efficiency, we propose a semi-analytical/empirical and semi-numerical approach; but with focus on the global splitting failure mode in this paper. The simulation method is validated against data we collected during the Oden Arctic Technology Research Cruise 2015 (OATRC2015). The data include: 1) camera images based on which we specify the exact geometry of ice floes before and after an impact and fracturing event; 2) IMU data based on which the global dynamic force encountered by the icebreaker is extracted for the impact event. It was found that this method presents reasonably accurate results and realistic fracturing patterns upon given ice floes.

조직몰입, 시장지향성, 조직학습의 관계에 관한 실증연구 (A Study on the Relationship between organizational commitment market orientation and organizational learning)

  • 정기한;김대업
    • 마케팅과학연구
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    • 제10권
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    • pp.139-164
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    • 2002
  • 90년 이후 현재까지 10여년 이상에 걸쳐 마케팅 개념의 구체적인 활동, 이른바 시장지향성과 관련개념에 대한 활발한 연구가 진행되어 오고 있다. 시장지향성은 고객지향에 초점을 둔 전사적 활동을 통하여 시장정보의 창출, 전파 및 활용과 경쟁자지향으로 요약될 수 있고 수익성에 직접적인 영향을 미치는 중요한 개념이다. 이러한 시장지향적 활동과 직접적인 관련이 있는 조직학습 및 조직몰입 역시 시장지향성과 함께 주요 연구대상이다. 본 연구에서는 조직몰입, 시장지향성, 조직학습의 문헌적 고찰을 통해 과거 연구들을 정리하고 이를 통해 아직까지 그 구조가 명확히 밝혀지지 않은 시장지향성 및 시장지향성과 조직학습간의 영향관계를 실증적으로 분석하였다. 분석 결과 시장지향성은 조직학습의 매우 밀접하게 관련있는 영향요인이며 조직몰입은 이러한 개념들의 선행적인 영향을 미치는 것으로 나타났다.

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GPS 이동측위를 위한 프로세스 잡음 모델링 (Modeling of Stochastic Process Noises for Kinematic GPS Positioning)

  • 홍창기
    • 한국측량학회지
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    • 제33권2호
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    • pp.123-129
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    • 2015
  • 알고리즘의 유연성 및 효율성으로 인해 GPS 이동측위 시 칼만필터가 주로 사용되어 왔으며 동시에 다양한 계통오차의 제거가 가능한 상대측위 기법이 널리 사용되어 왔다. 하지만 기선의 길이가 길어지게 되면 상대측위 기법을 사용하더라도 대기효과를 충분히 제거하기 어렵기 때문에 이 경우 제거되지 않고 남아 있는 대기효과를 상태벡터에 추가하여 추정을 하기도 한다. 칼만필터를 이용하는 경우 일반적으로 대기효과는 랜덤워크 혹은 일차가우스-마르코프 프로세스로 모델링하게 되는데 이때 프로세스 잡음에 대한 정확한 모델링이 필수적이다. 본 연구에서는 대기효과에 해당되는 프로세스 잡음 모델링을 위해 필요한 매개변수를 결정하였다. 이를 위해 이중차분 전리층 지연값과 천정방향 습윤지연값을 이용하여 실험적 자기상관함수를 계산하였으며 이를 통해 프로세스 잡음 모델링에 필요한 매개변수를 계산하였다. 결정된 매개변수값들은 유사한 대기환경에서 취득된 데이터에 대한 프로세스 잡음 모델링 시 직접 사용될 수 있으며 유사한 대기환경이 아닌 경우일 지라도 초기 근사값으로 활용될 수 있을 것이다.