• 한국콘텐츠학회논문지
• /
• 제19권3호
• /
• pp.539-547
• /
• 2019

본 연구의 목적은 팀 프로세스의 작은 세상 구조가 팀 성과에 미치는 영향을 탐색적으로 살펴보는 것이다. 관련 문헌을 고찰하여 팀 프로세스의 작은 세상 구조와 팀 성과 사이의 관계를 이론적으로 논의하였으며, 축구팀의 패스 데이터를 이용하여 실증적으로 분석하였다. 2014년 브라질 월드컵 경기의 패스 데이터를 수집하여 128개의 패스 네트워크를 구성하고 작은 세상을 나타내는 구조적 특성을 측정하였다. 이 과정에서 작은 세상의 정도를 측정하는 데 폭넓게 사용된 작은세상지수(small-world index)의 단점을 극복할 수 있는 새로운 지수를 개발하였다. 그리고 작은 세상 구조와 성과 사이의 관계를 밝히기 위하여 상관분석과 회귀분석을 실시하였다. 분석 결과에 의하면, 팀 프로세스의 군집성은 팀 성과와 지수함수의 관계가 있고 팀 프로세스의 연결성은 팀 성과와 로그함수의 관계가 있는 것으로 나타났다. 결과적으로 팀 프로세스의 작은 세상 구조는 팀 성과에 긍정적인 영향을 미치는 것으로 나타났다. 이론적 논의와 실증적 분석을 통해, 본 연구는 팀 프로세스의 작은 세상 구조가 팀원 사이의 업무 조정과 협업을 촉진하는데 효과적으로 작용하여 팀 성과에 긍정적인 영향을 미친다는 것을 밝혀내었다.

• 산경연구논집
• /
• 제5권2호
• /
• pp.13-20
• /
• 2014

Purpose - The purpose of this study is to empirically investigate the impact of capital structure on firm performance. Research design, data, and methodology - This study examined the impact of capital structure on the performance of cement companies listed on the Karachi Stock Exchange during the period 2009-2013. The authors hypothesize that there is a negative relationship between capital structure and firm performance. To examine the association, the authors run a Pearson correlation and multiple regression analysis. Results - Results reveal a strong negative relationship between debt to asset and firm performance variables (GPM, NPM, ROA, and ROE). Further, there is a positive relationship between debt to equity and firm performance variables (GPM and NPM), anda negative relationship between debt to equity and firm performance variables (ROA and ROE). Moreover, capital structure variables significantly impact firm performance. Conclusions - This study concluded that financial analysts and managers should emphasize on the optimal level of capital structure and efficient utilization and allocation of resources to achieve the targeted level of productive efficiency in business.

• Steel and Composite Structures
• /
• 제23권2호
• /
• pp.173-186
• /
• 2017

Conceptual configuration and seismic performance of high-rise steel frame-brace structure are studied. First, the topology optimization problem of minimum volume based on truss-like material model under earthquake action is presented, which is solved by full-stress method. Further, conceptual configurations of 20-storey and 40-storey steel frame-brace structure are formed. Next, the 40-storeystructure model is developed in Opensees. Two common configurations are utilized for comparison. Last, seismic performance of 40-storey structure is derived using nonlinear static analysis and nonlinear dynamic analysis. Results indicate that structural lateral stiffness and maximum roof displacement can be improved using brace. Meanwhile seismic damage can also be decreased. Moreover, frame-brace structure using topology optimization is most favorable to enhance lateral stiffness and mitigate seismic damage. Thus, topology optimization is an available way to form initial conceptual configuration in high-rise steel frame-brace structure.

• 한국시뮬레이션학회논문지
• /
• 제1권1호
• /
• pp.87-102
• /
• 1992

This paper presents the development of event-driven system level simulation tool SMPLE(Smpl Extende, an extention fo smpl) and its application to the performance analysis of multiprocessor computer systems. Because of its data structure, it is very difficult to change, expand or add new functions to simulation language smpl implemented by MacDougall. In SMPLE, we change data structure with structure and pointer, add new functions, and enable dynamic memory management. Using new data structure, facilities, and functions added in SMPLE, we simulate job processing of a shared bus multiprocessor system with autonomous hierarchical I/O subsystem. We set system performance contribution of subsystems and units. The impact of disk I/O on system performance is evaluated under vairous conditions of number of processors, processing power, memory access time and disk seek time.

• Steel and Composite Structures
• /
• 제51권1호
• /
• pp.93-101
• /
• 2024

This paper presents an experimental and analytical study on a steel slit damper designed as an energy dissipative device for earthquake protection of structures considering soil-structure interaction. The steel slit damper is made of a steel plate with a number of slits cut out of it. The slit damper has an advantage as a seismic energy dissipation device in that the stiffness and the yield force of the damper can be easily controlled by changing the number and size of the vertical strips. Cyclic loading tests of the slit damper are carried out to verify its energy dissipation capability, and an analytical model is developed validated based on the test results. The seismic performance of a case study building is then assessed using nonlinear dynamic analysis with and without soil-structure interaction. The soil-structure system turns out to show larger seismic responses and thus seismic retrofit is required to satisfy a predefined performance limit state. The developed slit dampers are employed as a seismic energy dissipation device for retrofitting the case study structure taking into account the soil-structure interaction. The seismic performance evaluation of the model structure shows that the device works stably and dissipates significant amount of seismic energy during earthquake excitations, and is effective in lowering the seismic response of structures standing on soft soil.

• 수산해양기술연구
• /
• 제54권3호
• /
• pp.255-261
• /
• 2018

High power trends in the diesel engines due to engine downsizing do not provide noise attenuation that can be satisfied with the performance of the existing silencer on account of high frequency increases in the exhaust noise. This study improves the attenuation performance of the exhaust silencer of the diesel engine and suggests silencer structure that performs best attenuation performance, especially at the high frequency range in the exhaust noise. It proposes dual silencer structure with an average attenuation performance of 6.4 dB and a maximum of 10.7 dB in the high frequency range (over 500 Hz), and analyzes its characteristics compared with the existing silencer. The performance analysis is performed according to 'Measurements on silencers in situation-ISO 11820:1996 Acoustics' and describes the results of comparative analysis with the existing silencer.

• 한국지진공학회:학술대회논문집
• /
• 한국지진공학회 2000년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
• /
• pp.267-274
• /
• 2000

Current seismic design codes for building structures are based on the method which can provide enough capacity to satisfy objected performance level and exactly evaluate the seismic performance of buildings. The capacity spectrum method using the nonlinear static(pushover) analysis is becoming a popular tool for evaluating the seismic performance of existing and new building structures. By means of a graphical procedure capacity spectrum method esimates the performance level of structure by comparing the capacity of structure with the demand of earthquake ground motion on the structure. In the method the relation between base shear estimated by a nonlinear static analysis and horizontal displacement is used. Capacity spectrum is usually expressed as what represent the responses of the equivalent single degree of freedom (ESDOF) system for the building structures. However there are some problems in converting procedures into ESDOF system which include not considering the effect of higher modes of structures. The objective of this paper is to compare and verify existing methods and suggest the modified capacity spectrum for seismic performance evaluation of building structures.

• Structural Engineering and Mechanics
• /
• 제43권4호
• /
• pp.545-560
• /
• 2012

Design codes provide the minimum requirements for the design of code-compliant structures to ensure the safety of the life and property. As for code-exceeding buildings, the requirements for design are not sufficient and the approval of such structures is vague. In mainland China in recent years, a large number of code-exceeding tall buildings, whether their heights exceed the limit for the respective structure type or the extent of irregularity is violated, have been constructed. Performance-based seismic design (PBSD) approach has been highly recommended and become necessary to demonstrate the performance of code-exceeding tall buildings at least equivalent to code intent of safety. This paper proposes the general methodologies of performance-based seismic analysis and design of code-exceeding tall buildings in Mainland China. The PBSD approach proposed here includes selection of performance objectives, determination of design philosophy, establishment of design criteria for structural components and systems consistent with the desirable and transparent performance objectives, and seismic performance analysis and evaluation through extensive numerical analysis or further experimental study if necessary. The seismic analysis and design of 101-story Shanghai World Financial Center Tower is introduced as a typical engineering example where the PBSD approach is followed. The example demonstrates that the PBSD approach is an appropriate way to control efficiently the seismic damage on the structure and ensure the predictable and safe performance.

• The Journal of Asian Finance, Economics and Business
• /
• 제7권9호
• /
• pp.85-93
• /
• 2020

The research objective examines the effect of corporate governance on capital structure and its effect on liquidity policy and corporate performance. It tests the effect of capital structure and liquidity policy on corporate governance. It also examines the effect of liquidity policy on capital structure and the effect of capital structure on liquidity policy. The study population is all manufacturing companies that went public on the Indonesia Stock Exchange in the period 2010-2019. The research population is 182 manufacturing companies. The Judgment Sampling was used and 109 companies meet the research criteria. The study used panel data for ten years so that the amount of data observed was 1090 observations. The analysis tool uses Warp Partial Least Square (WarpPLS). The results showed that corporate governance had a significant positive effect on capital structure, but corporate governance had a significant adverse effect on liquidity policy, and corporate governance had a significant positive effect on corporate performance. Furthermore, capital structure has a significant negative effect on corporate performance, but liquidity policy has no significant effect on corporate performance. Capital structure and liquidity policy are proven to be reciprocally significant positive correlations for manufacturing companies in Indonesia.

• Earthquakes and Structures
• /
• 제13권6호
• /
• pp.561-572
• /
• 2017

Seismic base isolation has been accepted as one of the most popular design procedures to protect important structures against earthquakes. However, due to lack of information and experimental data the application of base isolation is quite limited to nuclear power plant (NPP) industry. Moreover, the effects of inelastic behavior of soil beneath base-isolated NPP have raised questions to the effectiveness of isolation device. This study applies the wavelet analysis to investigate the effects of soil-structure interaction (SSI) on the seismic response of a base-isolated NPP structure. To evaluate the SSI effects, the NPP structure is modelled as a lumped mass stick model and combined with a soil model using the concept of cone models. The lead rubber bearing (LRB) base isolator is used to adopt the base isolation system. The shear wave velocity of soil is varied to reflect the real rock site conditions of structure. The comparison between seismic performance of isolated structure and non-isolated structure has drawn. The results show that the wavelet analysis proves to be an efficient tool to evaluate the SSI effects on the seismic response of base-isolated structure and the seismic performance of base-isolated NPP is not sensitive to the effects in this case.