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Corporate Governance and the Global Reach of Chinese Family Firms in Singapore
Henry Wai-chung Yeung,Tse Min Soh 서울대학교 경제연구소 2000 Seoul journal of economics Vol.13 No.3
The emergence of Chinese business conglomerates in recent decades has spurned a lot of interesting literature in the field of Chinese business. Much has been attributed to the "bamboo networks" in explaining the entrepreneurial success of ethnic Chinese outside China. In this paper, we examine the international linkages of 157 public-listed Chinese family firms in Singapore. We show that although they conform to some of the characteristics mentioned in the existing literature, public-listed Chinese family firms have forged global linkages directly by means of overseas principal bankers and auditors. These global linkages help to influence the corporate governance practices of Chinese family firms. We conclude the paper with some implications for future research and management policies.
Weight Reduction of Boom System of an Aerial Lift Truck Using the Taguchi Method
Henry Panganiban,Hae-Rim Lee(이해림),Yong Hong(홍룡),Gang-Won Jang(장강원),Tae-Jin Chung(정태진) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Weight reduction by optimizing the design of the boom system for the aerial platform truck is performed using the Taguchi method. Matrix experiments were performed using the constructed orthogonal array of design parameters or factors with a maximum of three settings or levels for each factor. The factors considered are the overlap length between booms, crosssection shape and plate thicknesses. Experiments were carried out with parametric analysis setup in ANSYS Workbench while the optimization is done in Minitab. The CAE-based optimization method enables concept design and verification to be performed over a short period of time. The optimal design has reduced the weight of the boom system by over 10% with structural performance close to the original design.
Recent Development in Non-Contact NDE Using Electromagnetic Acoustic Transducer (EMAT) Technology
Henry Panganiban,Tae Jin Chung,Gang Won Jang 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
EMATS is the commonly used non-contact inspection and monitoring technology for non-destructive evaluation especially in industrial applications. Various developments and technology have emerged so fast. Some of these developments are electromagnetic ultrasonic 3D modeling with FEM, phase array operation of EMATS, and the tests for the possibility to use dispersive Shear Horizontal modes for NOT. In this paper, some of the emerging technology and recent advances in non-contact NDE using EMATS were pointed out.
Indoor Propagation Characteristics at 5.2GHz in Home and Office Environments
Chung, Hyun-Kyu,Bertoni, Henry L. The Korea Institute of Information and Commucation 2002 Journal of communications and networks Vol.4 No.3
This paper presents results of continuous wave and swept frequency response measurements over the frequency range of UNII lower and middle bands from 5.15GHz to 5.35GHz in indoor environments. From the continuous wave measurements at 5.2GHz, the excess path loss, and the statistical characteristics of the temporal and spatial fading were found. By sweeping the frequency over the band, envelope correlation as a function of frequency was found and the coherence bandwidth (CBW) was determined from the envelope correlation. Using a channel model, the CBW was used to evaluate RMS delay spread. The dependence of CBW on the antenna polarization was simulated and compared with the measurement results. The influence of room size and separation of transmitter and receiver for LOS paths on RMS delay spread was discussed.
THICKNESS OPTIMIZATION OF AN AUTOMOBILE BODY FOR NATURAL FREQUENCY MAXIMIZATION
Henry Panganiban,Gang-Won Jang,Tae-Jin Chung,Young-Min Choi 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The paper presents design optimization of an automobile body for dynamic stiffness improvement. The thicknesses of plates making-up the monocoque body of an automobile were employed as design variables for optimization and the objective was to increase the first torsional and bending natural frequencies. By allotting one design variable to each plate of the body, compared to previous works based on element-wise design variables, design space of optimization was reduced to a large extent and numerical instabilities such as checkerboard pattern was efficiently evaded. The method resulted to a considerable amount of increase in the automobile body’s torsional and bending natural frequencies. Considering manufacturability of the optimized result, the converged values of plate thicknesses were approximated to commercially-available values by appropriately reflecting their design sensitivities.
Optimization of flatbed trailer frame using the ground beam structure approach
Henry P. Panganiban,Tae-Jin Chung,장강원 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.5
An alternative lightweight flatbed trailer design is achieved through a multi-stage optimization procedure. Topology optimization is used to obtain the optimal layout of flatbed trailer frame beams that provide minimum compliance when subjected to bending loads and exhibits maximum torsional natural frequency. The ground structure approach is used to define the trailer frame layout by generating numerous beams connected to predefined points in the trailer. Topology optimization is formulated as a multi-objective problem subject to a mass constraint. Responses and sensitivities are evaluated using ANSYS, and the optimization problem is solved using the moving asymptotes method. The thicknesses, widths, and heights of the C-channel beams are optimized for further weight reduction while at least maintaining the structural performances of the original design. Size and shape optimizations are performed using OptiStruct. The new optimal design is approximately 13% (275 kg) lighter than and as stiff as the original design for bending loads. However, the former has 3.5 times higher torsional natural frequency than the latter. Moreover, the new optimal design has positive manufacturability because the channel beams will be made out of commercially available sheet metals. The same fabrication technology as for a conventional flatbed trailer is possibly to be used.
Topology Optimization of Support Structure for Long-Range Boom Lift
Henry Panganiban,Woncheol Kim,Tae-Jin Chung 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Structural design of long-range telescopic boom system used for lifting work platform requires serious consideration of structural integrity and reliability. Component design can be rapidly and economically conceptualized using CAE tools. In this work, the concept design of support structure for a long-range telescopic boom lift is obtained using topology optimization method. The classical topology optimization formulation is implemented with consideration on various load cases encompassing actual operation conditions. Transfer mechanism of loads from the work platform and boom self-weight into the support structure is analyzed and verified by FEM. In the analytical solution, boom self-weight is defined by its magnitude and location in space while bar or truss elements are used to model the boom structure with the corresponding point loads. Agreement of the calculated reaction forces is very close. The support structure is isolated with the reaction forces imposed on predefined loading points of the structure and topology optimization is carried out. This method can significantly reduce FE-model size and consequently computation time allowing more opportunities to explore possible design configurations within the capability of the topology optimization tool being used. The topology or material layout of the support structure at the converged iteration will be translated into manufacturable final design using a CAD tool.
Analysis of Break in Presence During Game Play Using a Linear Mixed Model
Jaeyong Chung,Henry J. Gardner,Hwan-Jin Yoon 한국전자통신연구원 2010 ETRI Journal Vol.32 No.5
Breaks in presence (BIP) are those moments during virtual environment (VE) exposure in which participants become aware of their real world setting and their sense of presence in the VE becomes disrupted. In this study, we investigate participants’ experience when they encounter technical anomalies during game play. We induced four technical anomalies and compared the BIP responses of a navigation mode game to that of a combat mode game. In our analysis, we applied a linear mixed model (LMM) and compared the results with those of a conventional regression model. Results indicate that participants felt varied levels of impact and recovery when experiencing the various technical anomalies. The impact of BIPs was clearly affected by the game mode, whereas recovery appears to be independent of game mode. The results obtained using the LMM did not differ significantly from those obtained using the general regression model; however, it was shown that treatment effects could be improved by consideration of random effects in the regression model.
Topology optimization of pressure-triggered compliant mechanisms
헨리 팡가니반(Henry Panganiban),장강원(Gang Won Jang),정태진(Chung Tae Jin) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
The paper presents an alternative approach for the topology optimization of compliant mechanism for micro devices under pressure input force. A well-known optimization formulation was used along with the proposed new form of constraint based on the static stiffness of the structure. The pure-displacement (standard) formulation was also used for the finite element analysis. Shortcomings brought by the associated pressure load problem were addressed with the use of incompressible material and nonconforming finite elements. Problems in two and three dimensions were solved as examples.