Geun Woo Kim and Kang Yong Lee
Optimisation of the package design in order to reduce stresses in a plastic small outline J‐lead (SOJ) package and to thereby prevent fractures during the infrared soldering…
Abstract
Purpose
Optimisation of the package design in order to reduce stresses in a plastic small outline J‐lead (SOJ) package and to thereby prevent fractures during the infrared soldering process.
Design/methodology/approach
Finite element (FE) modelling was used, both with and without crack tip‐modelling. A design of experiment (DOE) approach was used to reduce the number of FE models required.
Findings
The optimum design values for minimization of thermal stress and the prevention of fracture were found to be different. The results allow the values of design variables such as the dimensions and material properties of the IC package.
Practical implications
To reduce the stresses and thereby prevent fracture, the values of the Young's modulus and coefficient of thermal expansion of the epoxy moulding compound should be reduced.
Originality/value
The work has used both stress analysis and fracture mechanics analysis along with DOE to identify the design values which simultaneously reduce the thermal stresses and prevent the fracture of the IC package.
Details
Keywords
China is currently developing and promoting an industrial cluster policy at the government level. By enacting the ‘Opinion on promoting industrial cluster development’, China is…
Abstract
China is currently developing and promoting an industrial cluster policy at the government level. By enacting the ‘Opinion on promoting industrial cluster development’, China is supporting the development of industrial clusters. Building an industrial cluster is done by using a single factor but requires many additional factors like regional characteristics, competitiveness factors are also diversified. To evaluate the competitiveness of the Chinese automobile industry cluster, a competitiveness element index should be developed and a competitiveness evaluation method is needed to evaluate the importance of each element. To accomplish this objective, this research applied the analytic hierarchy process (AHP) and focused on the importance of the competitiveness elements.
This research investigated the character is tics regarding cases of clusters and also analyzed the competitiveness of the Changchun automobile cluster located in northeastern China. The purpose of this research is to help Korean enterprises who enter China in the hopes that Korea will emerge as a top automobile production country.
Details
Keywords
The purpose of this paper is to examine regional voting patterns in South Korea using the results from six presidential elections since the 1990s.
Abstract
Purpose
The purpose of this paper is to examine regional voting patterns in South Korea using the results from six presidential elections since the 1990s.
Design/methodology/approach
A χ2 test was used to determine the municipalities where a regional voting pattern emerged, and λ correlation coefficients were calculated to examine changes in the regional voting patterns.
Findings
The analyses lead to three key findings. First, voting patterns differ in Yeongnam and Honam: regional voting in Yeongnam is getting weaker, it remains strong in Honam. Second, the tendency to vote along regional lines decreased significantly in the election in which the Honam party fielded a candidate with a Yeongnam appeared identity. Third, regional voting patterns declined but then stabilized at a constant level, regardless of the candidates’ local identity, which was confirmed in “Bu-Ul-Gyeong.”
Originality/value
This paper can empirically verify the manifestation of regional voting pattern and confirm the trend. It is possible to derive a condition for suppressing the regional voting pattern.