• 산업융합연구
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• 제22권2호
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• pp.33-43
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• 2024

본 연구의 목적은 어떻게 브랜드배태성이 교차구매의도에 영향을 미치는지를 확인하는 것이다. 이와 함께 이들 관계에 고객만족이 매개역할을 하는지를 함께 분석하고자 한다. 이를 위하여 표본은 특정 스마트폰 브랜드를 사용하는 소비자이며, 이들을 대상으로 설문조사하여 258부를 수집하였다. 실증분석은 구조방정식모형과 고객만족의 매개효과를 확인하기 위하여 비모수 붓스트레핑분석을 통한 추가분석을 실시하였다. 그 결과는 다음과 같다. 첫째, 브랜드배태성은 고객만족과 교차구매의도에 긍정적으로 영향을 미치는 것으로 확인하였다. 둘째, 고객만족은 교차구매의도에 긍정적으로 영향을 미치는 것으로 밝혀졌다. 이들 결과와 매개효과분석결과를 종합하면, 고객만족은 브랜드배태성과 교차구매의도에 유의한 매개역할을 하며, 브랜드배태성, 고객만족, 교차구매의도의 관계가 부분매개모형인 것을 보여준다. 또한 브랜드배태성의 교차구매의도에 대한 직접효과가 고객만족을 통한 간접효과보다 큰 것으로 나타났다. 이러한 실증분석 결과는 사회자본으로써 브랜드배태성이 교차구매의도의 선행요인이 될 수 있다는 학문적 가치를 보여준다. 또한 본 연구는 브랜드 실무자가 교차구매를 증대시키기 위하여 브랜드와 관련된 고객의 배태성을 높이는 것은 물론 고객만족의 매개역할을 함께 고려할 필요성을 제안한다.

• Coupled systems mechanics
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• 제13권3호
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• pp.201-217
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• 2024

This study aims to develop a new model to obtain the minimum area in circular isolated footings with eccentric column taking into account that the surface in contact with the ground works partially in compression, i.e., a part of the contact area of the footing is subject to compression and the other there is no pressure (pressure zero). The new model is formulated from a mathematical approach based on a minimum area, and it is developed by integration to obtain the axial load "P", moment around the X axis "M_x" and moment around the Y axis "M_y" in function of σ_max (available allowable soil pressure) R (radius of the circular footing), α (angle of inclination where the resultant moment appears), y₀ (distance from the center of the footing to the neutral axis measured on the axis where the resultant moment appears). The normal practice in structural engineering is to use the trial and error procedure to obtain the radius and area of the circular footing, and other engineers determine the radius and area of circular footing under biaxial bending supported on elastic soils, but considering a concentric column and the contact area with the ground works completely in compression. Three numerical problems are given to determine the lowest area for circular footings under biaxial bending. Example 1: Column concentric. Example 2: Column eccentric in the direction of the X axis to 1.50 m. Example 3: Column eccentric in the direction of the X axis to 1.50 m and in the direction of the Y axis to 1.50 m. The new model shows a great saving compared to the current model of 44.27% in Example 1, 50.90% in Example 2, 65.04% in Example 3. In this way, the new minimum area model for circular footings will be of great help to engineers when the column is located on the center or edge of the footing.

• 경영정보학연구
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• 제22권2호
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• pp.101-120
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• 2020

본 연구는 B2C 물류서비스 이용자의 프라이버시 심리를 조사하였다. 본 연구에서는 인지밸런스이론을 이용해 이론적 프레임워크를 개발하였고, 이 프레임워크를 이용해 물류보안지식, 프라이버시 신뢰, 프라이버시 위험, 프라이버시 우려, 개인정보보호를 위한 컴플라이언스 행동의지에 대한 연구모델을 제안하였다. 그리고, B2C 물류서비스 이용자들을 대상으로 설문조사를 통해, 151부의 유효한 응답을 획득하였고, 구조방정식 소프트웨어를 이용해 실증분석을 하였다. 실증분석 결과를 살펴보면, 물류보안지식은 프라이버시 신뢰와 위험에 영향을 미쳤고, 프라이버시 신뢰는 컴플라이언스 행동의지에 영향을 미쳤다. 그러나, 물류보안지식은 컴플라이언스 행동의지에 영향을 미치지 않았다. 본 연구결과는 물류서비스에서 정보보안과 프라이버시 보호가 중시되는 현 시점에서 연구자들에게 물류보안 연구를 위한 이론적 시사점을 제공해 줄 것이고, 실무자들에게는 보다 안전한 물류서비스 개발을 위한 시사점을 제공해 줄 것이다.

• 한국건축시공학회지
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• 제24권1호
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• pp.157-168
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• 2024

최근 국내 건축현장에서 붕괴사고가 계속해서 발생하고 있어 시공 및 자재 품질 점검과 관리에 대한 공사감리의 중요성이 증가하고 있다. 현행 제도 및 기준에 의하면, 공사감리 업무는 주요 책임이 있는 감리자가 건축현장에서 진행되고 있는 시공 품질, 자재 품질, 재시공 이력 등이 상세하게 기술하여 공사감리보고서를 작성한다. 이러한 문서는 대표적인 비정형데이터로 건축현장에서 생성되고 있는 데이터의 80%의 비중을 차지하고 있으며, 건축현장의 품질정보가 상세하게 기록되어있다. 본 연구에 건축현장에서 발생하고 있는 공사감리보고서를 텍스트마이닝으로 전처리 후 감성사전을 구축하여 품질성과 수준을 평가하고 계량화할 수 있는 SL-QPA 모델을 제안하였다. 모델에서 산정된 성과 점수와 법적 기준에 의한 지표와의 피어슨 상관관계 분석하고, 상관계수에 대한 일원분산분석 결과는 통계적으로 유의미하였다. 제안된 SL-QPA 모델은 현행 건축현장 품질성과 진단에 상호 보완적으로 활용될 수 있고, 공사단계에서 연속적으로 생성되는 비정형데이터를 활용하여 점검 및 관리 활동의 적시성을 향상시킬 것으로 기대된다.

• 대한한의학회지
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• 제45권1호
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• pp.150-164
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• 2024

Objectives: This study aimed to investigate the levels of brain iron deposition in Parkinson's disease (PD) patients using Quantitative Susceptibility Mapping (QSM) and to determine whether distinctions compared to the general population exist. Furthermore, we examined potential variations in iron deposition among different PD subtypes. Methods: Structural brain imaging was conducted on 75 participants at Gangdong Kyung Hee University Hospital between August 2017 and May 2020. PD patients were categorized into Tremor Dominant (TD) and Postural Instability and Gait Difficulty (PIGD) subtypes. Voxel-based morphometry and QSM were employed to compare voxel-wise magnetic susceptibility across the entire brain between Normal Controls (NC) and PD groups. Subsequently, QSM values were compared between TD and PIGD groups. Results: QSM values were compared among 46 PD patients and 23 normal controls, as well as between TD (n=22) and PIGD (n=24) groups. Voxel-based QSM analysis revealed no significant differences between groups. Similarly, ROI-based QSM analysis showed no significant distinctions. Conclusions: No significant variations were observed between the PD patient group, NC group, or PD subtypes. This study systematically compared QSM values across a broad range of brain regions potentially linked to PD pathology. Additionally, the subdivision of the PD group into TD and PIGD subtypes for QSM-based iron deposition analysis represents a meaningful and innovative approach.

• Steel and Composite Structures
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• 제50권6호
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• pp.705-720
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• 2024

Analyzing the collapse behavior of thin-walled steel structures holds significant importance in ensuring their safety and longevity. Geometric imperfections present on the surface of metal materials can diminish both the durability and mechanical integrity of steel shells. These imperfections, encompassing local geometric irregularities and deformations such as holes, cavities, notches, and cracks localized in specific regions of the shell surface, play a pivotal role in the assessment. They can induce stress concentration within the structure, thereby influencing its susceptibility to buckling. The intricate relationship between the buckling behavior of these structures and such imperfections is multifaceted, contingent upon a variety of factors. The buckling analysis of thin-walled steel shell structures, similar to other steel structures, commonly involves the determination of crucial material properties, including elastic modulus, shear modulus, tensile strength, and fracture toughness. An established method involves the emulation of distributed geometric imperfections, utilizing real test specimen data as a basis. This approach allows for the accurate representation and assessment of the diversity and distribution of imperfections encountered in real-world scenarios. Utilizing defect data obtained from actual test samples enhances the model's realism and applicability. The sizes and configurations of these defects are employed as inputs in the modeling process, aiding in the prediction of structural behavior. It's worth noting that there is a dearth of experimental studies addressing the influence of geometric defects on the buckling behavior of cylindrical steel shells. In this particular study, samples featuring geometric imperfections were subjected to experimental buckling tests. These same samples were also modeled using Finite Element Analysis (FEM), with results corroborating the experimental findings. Furthermore, the initial geometrical imperfections were measured using digital image correlation (DIC) techniques. In this way, the response of the test specimens can be estimated accurately by applying the initial imperfections to FE models. After validation of the test results with FEA, a numerical parametric study was conducted to develop more generalized design recommendations for the stainless-steel shell structures with the initial geometric imperfection. While the load-carrying capacity of samples with perfect surfaces was up to 140 kN, the load-carrying capacity of samples with 4 mm defects was around 130 kN. Likewise, while the load carrying capacity of samples with 10 mm defects was around 125 kN, the load carrying capacity of samples with 14 mm defects was measured around 120 kN.

• 한국병원경영학회지
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• 제29권2호
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• pp.57-79
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• 2024

연구의 목적: 본 연구의 목적은 중소 지방 병원 내에서 사내 기업가 활동 의도의 선행요인을 탐색함에 있다. 본 연구는 병원 종사자의 개인적 역량과 경영적 역량이 사내 기업가 지향성에 긍정적인 영향을 미칠 것으로 예측하였다. 그리고 사내 기업가 활동의도에 미치는 사내 기업가 지향성의 영향은 사내 기업가 활동의 헌신에 의해서 매개가 될 것으로 예측하였다. 연구방법론: 우리나라 창원시에 위치한 'D'병원과 'E' 병원에서 종사하는 299명의 의료인으로부터 설문자료를 수집하였다. 그리고 수집된 자료에 대하여 구조방정식 모형분석을 수행하여 연구모형과 연구가설을 통계적 유의수준에서 평가하였다. 연구결과: 본 연구의 주요 결과는 다음과 같다. 첫째, 연구대상자가 인식하는 개인적 역량과 경영적 역량은 사내 기업가 지향성에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 사내 기업가 지향성은 사내 기업가 활동 의도에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 셋째, 사내 기업가 활동 의도에 미치는 사내 기업가 지향성의 영향은 사내 기업가 활동 헌신에 의해서 매개가 되는 것으로 나타났다. 넷째, 비의료 집단 내에서의 사내 기업가 활동 헌신의 매개효과는 의료집단 내에서의 매개효과보다 크며, 관찰된 차이는 통계적으로 유의한 것으로 평가되었다. 시사점: 본 연구의 결과는 우리나라 중소병원이 가지는 어려움과 문제점을 해결하기 위해 수행해야 하는 전략 중의 하나인 사내 기업가 활동을 활성화하기 위한 중요한 전제조건과 시사점을 제공한다.

• 산업경영시스템학회지
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• 제47권3호
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• pp.86-94
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• 2024

In this study, an attempt was made to approximate the main characteristic values of Bi_0.5(Na_0.78K_0.22)_0.5TiO₃ (= BNKT) depending on the content of Fe₂O₃ additives, aiming to approach the values of lead(Pb) piezoelectric ceramic materials (PZT). Specifically, when the piezoelectric coefficient (d₃₃) value of lead(Pb) piezoelectric ceramic material (PZT polycrystalline ceramic powder) is 300[pC/N] or higher, it is applied for hard purposes such as ultrasonic welding machines and cleaning machines, and when it exceeds 330[pC/N], it is applied for soft purposes like piezoelectric sensors. In this study, research and development were conducted for devices with a piezoelectric coefficient (d₃₃) of 300[pC/N] or more for actuators. For this purpose, K⁺ exceeding 0.02 to 0.12 mol% was added to (Na_0.78K_0.22)_0.5Bi_0.5TiO₃ to analyze structural changes due to K⁺ excess, and (Na_0.78K_0.22)_0.5Bi_0.5TiO₃ + 8mol% K₂CO₃ Ti⁴⁺ was substituted with Fe³⁺ to manufacture lead-free piezoelectric materials. As a result, ceramics with Fe³⁺ substitution at x = 0.0075 yielded an average value of d₃₃ = 315[pC/N]. Furthermore, for ceramics with Fe³⁺ substitution at x = 0.0075, the average values of maximum polarization (P_max), residual polarization (P_rem), and coercive field (E_c) were found to be 39.63 μC/cm², 30.45 μC/cm², and 2.50 kV/mm, respectively. The reliable characteristic values obtained from the research results can be applied to linear actuator components (such as the zoom function of mobile cameras, LDM for skin care, etc.) and ultrasonic vibration components.

• Advances in concrete construction
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• 제17권2호
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• pp.111-126
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• 2024

During the clinkering stages of cement production, the chemical composition of fine raw materials such as limestone and clay, which include iron oxide (Fe₂O₃), silicon dioxide (SiO₂) and aluminum oxide (Al₂O₃), significantly influences the quality of the final product. Specifically, the chemical interaction of Fe₂O₃ with CaO, SiO₂ and Al₂O₃ during clinkerisation plays a key role in determining the chemical reactivity and overall quality of the final cement, shaping the properties of the concrete produced. As an extension, this study aims to investigate the physical effects of incorporating nanosized Fe₂O₃ particles as fillers in concrete matrices, and their impact on concrete structures, namely slabs. To accurately model the reinforced concrete (RC) slabs, a refined trigonometric shear deformation theory (RTSDT) is used. Additionally, the stochastic Eshelby's homogenization approach is employed to determine the thermoelastic properties of nano-Fe₂O₃ infused concrete slabs. To ensure comprehensive coverage in the study, the RC slabs undergo various mechanical loads and are exposed to temperature fields to assess their thermo-mechanical performance. Furthermore, the slabs are assumed to rest on a three-parameter viscoelastic foundation, comprising the Winkler elastic springs, Pasternak shear layer and a damping parameter. The equilibrium governing equations of the system are derived using the principle of virtual work and subsequently solved using Navier's technique. The findings indicate that while ferric oxide nanoparticles enhance the mechanical properties of concrete against mechanical loading, they have less favorable effects on its performance against thermal exposure. However, the viscoelastic foundation contributes to mitigating these effects, improving the concrete's overall performance in both scenarios. These results highlight the trade-offs between mechanical and thermal performance when using Fe₂O₃ nanoparticles in concrete and underscore the importance of optimizing nanoparticle content and loading conditions to improve the structural performance of concrete structures.

• Asia pacific journal of information systems
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• 제22권3호
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• pp.75-97
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• 2012

Knowledge residing in the heads of employees has always been regarded as one of the most critical resources within a firm. However, many tries to facilitate knowledge transfer among employees has been unsuccessful because of the motivational and cognitive problems between the knowledge source and the recipient. Social capital, which is defined as "the sum of the actual and potential resources embedded within, available through, derived from the network of relationships possessed by an individual or social unit [Nahapiet and Ghoshal, 1998]," is suggested to resolve these motivational and cognitive problems of knowledge transfer. In Social capital theory, there are two research streams. One insists that social capital strengthens group solidarity and brings up cooperative behaviors among group members, such as voluntary help to colleagues. Therefore, social capital can motivate an expert to transfer his/her knowledge to a colleague in need without any direct reward. The other stream insists that social capital provides an access to various resources that the owner of social capital doesn't possess directly. In knowledge transfer context, an employee with social capital can access and learn much knowledge from his/her colleagues. Therefore, social capital provides benefits to both the knowledge source and the recipient in different ways. However, prior research on knowledge transfer and social capital is mostly limited to either of the research stream of social capital and covered only the knowledge source's or the knowledge recipient's perspective. Social network theory which focuses on the structural dimension of social capital provides clear explanation about the in-depth mechanisms of social capital's two different benefits. 'Strong tie' builds up identification, trust, and emotional attachment between the knowledge source and the recipient; therefore, it motivates the knowledge source to transfer his/her knowledge to the recipient. On the other hand, 'weak tie' easily expands to 'diverse' knowledge sources because it does not take much effort to manage. Therefore, the real value of 'weak tie' comes from the 'diverse network structure,' not the 'weak tie' itself. It implies that the two different perspectives on strength of ties can co-exist. For example, an extroverted employee can manage many 'strong' ties with 'various' colleagues. In this regards, the individual-level structure of one's relationships as well as the dyadic-level relationship should be considered together to provide a holistic view of social capital. In addition, interaction effect between individual-level characteristics and dyadic-level characteristics can be examined, too. Based on these arguments, this study has following research questions. (1) How does the social capital of the knowledge source and the recipient influence knowledge transfer respectively? (2) How does the strength of ties between the knowledge source and the recipient influence knowledge transfer? (3) How does the social capital of the knowledge source and the recipient influence the effect of the strength of ties between the knowledge source and the recipient on knowledge transfer? Based on Social capital theory and Social network theory, a multi-level research model is developed to consider both the individual-level social capital of the knowledge source and the recipient and the dyadic-level strength of relationship between the knowledge source and the recipient. 'Cross-classified random effect model,' one of the multi-level analysis methods, is adopted to analyze the survey responses from 337 R&D employees. The results of analysis provide several findings. First, among three dimensions of the knowledge source's social capital, network centrality (i.e., structural dimension) shows the significant direct effect on knowledge transfer. On the other hand, the knowledge recipient's network centrality is not influential. Instead, it strengthens the influence of the strength of ties between the knowledge source and the recipient on knowledge transfer. It means that the knowledge source's network centrality does not directly increase knowledge transfer. Instead, by providing access to various knowledge sources, the network centrality provides only the context where the strong tie between the knowledge source and the recipient leads to effective knowledge transfer. In short, network centrality has indirect effect on knowledge transfer from the knowledge recipient's perspective, while it has direct effect from the knowledge source's perspective. This is the most important contribution of this research. In addition, contrary to the research hypothesis, company tenure of the knowledge recipient negatively influences knowledge transfer. It means that experienced employees do not look for new knowledge and stick to their own knowledge. This is also an interesting result. One of the possible reasons is the hierarchical culture of Korea, such as a fear of losing face in front of subordinates. In a research methodology perspective, multi-level analysis adopted in this study seems to be very promising in management research area which has a multi-level data structure, such as employee-team-department-company. In addition, social network analysis is also a promising research approach with an exploding availability of online social network data.