• Textile Coloration and Finishing
• /
• v.22 no.3
• /
• pp.257-263
• /
• 2010

Oil-absorbable nonwovens were produced by meltblown processing of polypropylene chips. In this study, experimental array and variance analysis of the design of experiment were used to increase the field repeatability and universality. Oil absorbency was decreased, as oil absorbable nonwovens of packing density and gearpump speed were increased. Oil absorption rate was increased, as packing density was increased. Also the oil absorption rate increased with increasing gear-pump speed.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.10a
• /
• pp.316-319
• /
• 2002

Injection mold is a manufacturing process used to produce parts of complicated shape at a low cost. Many factors affect the quality of injection molded part during injection molding process. A study on the optimization of injection mold is progressed by using a simulation software like Moldflow. Filling, packing and cooling phases of injection molding processes are analyzed according to the mold design considering the shrinkage of molded part, the degree of filling rate and the wearing of a mold. Taguchi method is applied to analyze the significance of processing parameters and the dynamic characteristics according to the variation of processing parameters. From the results, the mold temperature and packing pressure influenced strongly the shrinkage of injection molded part.

• Asia-Pacific Journal of Business
• /
• v.12 no.3
• /
• pp.101-115
• /
• 2021

Purpose - The purpose of this study was to examine the impact of packing regulations as a technical standard barrier on export trade. Design/methodology/approach - This study analyzed cases related to packing in major countries such as US, EU and so on. It is also show the example of export volume changed based on PRTS. Findings - First, the role of packaging and the reason why countries issued relevant packaging provisions were introduced. Then, the impacts of PRTS on export trade were expounded. And next, we focused on investigating some PRTS related cases in export trade and gave an example of export volume changed based on PRTS. Finally, we produced implications for business leaders to aware of the importance of PRTS in export. Research implications or Originality - This study provide PRTS information to traders. Trade pratitioners can respond to PRTS related regulations, actively develop PRTS technology, and take relavant to deal with PRTS barriers to eliminate or weaken the adverse effects of PRTS on export trade.

• Korea-Australia Rheology Journal
• /
• v.13 no.1
• /
• pp.47-54
• /
• 2001

Prediction of the maximum packing volume fraction with non-spherical particles has been one of the important problems in powder technology. The sphericity of fly ash particles depending on the particle diameter was measured by means of a CCD image processing instrument. An algorithm to predict the maximum packing volume fraction with non-spherical particles is proposed. The maximum packing volume fraction is used to predict the slurry viscosity under well dispersed conditions. For this purpose, Simha's cell model is applied for concentrated slurry with wide particle size distribution. Also, Usui's model developed for aggregative slurries is applied to predict the non-Newtonian viscosity of dense fly ash - water slurry. It is certified that the maximum packing volume fraction for non-spherical particles can be successfully used to predict slurry viscosity. The pressure drop in a pipe flow is predicted by using the non-Newtonian viscosity of dense fly ash-water slurry obtained by the present model. The predicted relationship between pressure drop and flow rate results in a good agreement with the experimented data obtained for a test rig with 50 mm inner diameter tube. Base on the design procedure proposed in this study, a feasibility study of fly ash hydraulic transportation system from a coal-fired power station to a controlled deposit site is carried out to give a future prospect of inexpensive fly ash transportation technology.

• Design & Manufacturing
• /
• v.2 no.4
• /
• pp.54-61
• /
• 2008

Warpage, which is one of the molding trouble, acts as possible factor which results in defect in assembly. In this study, a mold was designed to produce specimens with rib parallel to flow direction, specimens with rib perpendicular to flow direction and specimens without rib. This work researched change of warpage according to injection molding condition such as injection pressure, packing pressure, packing time, resin temperature, mold temperature in non-crystalline resins(PC, ABS), crystalline resins(PP, PA66), and 30% glass fiber reinforced-resins(PC, ABS, PP, PA66).Specimens with rib and Crystalline resins show more warpage than specimens without rib and non-crystalline resins, respectively. Glass fiber reinforced-resins and specimens with rib parallel to flow direction show smaller warpage than conventional resins and specimens with rib perpendicular to flow, respectively. Specimens with rib and specimens without rib show reduced warpage as packing time increases. In addition, warpage increase as resin temperature increases. It is found that CAE shows similar tendency with experiment as packing time, resin temperature. when the rib is caused, warpage will reduce and prevent the transformation. product of a irregular form occurs warpage. In the study It'll be basic data that product occurs warpage, preferablity.

• Journal of the Semiconductor & Display Technology
• /
• v.21 no.2
• /
• pp.51-56
• /
• 2022

Recently, the demand for semiconductors is expanded to various industries, and the use of high-quality and high-performance chips is increasing. With the trend, the diameter magnification and high integration of the semiconductor wafers are mandatory. As a result, there is a growing demand for the productivity improvement and the surface precision. There have been many studies on the stabilization of the wafer manufacturing processes in order to satisfy those specifications. Many complaints have been appealed by the wafer buyers that there are many unacceptable wafers with surface defects and foreign material adhesion which are caused by the vibrations during transportation. This study intends to derive the material improvement of the packing box of the wafers to suppress the vibrations of the box, and eventually to reduce the surface defects and the foreign material adhesion. The result shows that optimal material can substantially decrease the vibration of the packing box.

• Hwankyungkyoyuk
• /
• v.12 no.1
• /
• pp.225-241
• /
• 1999

The art subject deals with aesthetic experience within natural environment around and artificial environment, and it represents the experience through formative arts. And it also extends the aesthetic experience by making students appreciation of the works of art. In the main text of this study was studied with the connection with environmental education on the basis of the characteristics of art subject. That is, in the art education there can be an understanding of the harmony between natural environment and artificial one and their relationship and, furthermore, more positive environmental education can be possible by environmental murals, environmental sculpture, environmental design, packing design, poster design, elf through systematic formative arts. In addition, the art education can make students keep sensitivity to the natural and artificial environment through the appreciation of a variety of art works made with a theme of environment or through the appreciation of the works in the environment around our lives. Also, it can lead to acquire the desirable values and attitudes toward the environment by discussing the harmony of environmental development and environmental preservation visually. In the second place, this relation described in detail by each grade according to the contents of the 7th curriculum for the art subject. In the third place, the following were suggested: the goals for the environmental education in the art subject, the direction of environmental education, the organization of contents related to environment and their emphases, and the main teaching and learning methods for environmental education.

• Journal of ILASS-Korea
• /
• v.24 no.1
• /
• pp.8-14
• /
• 2019

The purpose of this study is to develop a packing-free wet scrubber to prolong the maintenance interval compared with the conventional packed bed wet scrubbers with which frequent operation stops are unavoidable to clean the packing materials. The main- and interaction-effects were quantitatively analyzed by regression analysis for the measured ammonia scrubbing data from the experiments prepared by experimental design. The scrubbing efficiency of the newly developed wet scrubber was found to be over 95% under the condition of flue gas flow rate of 90CMM and liquid-to-gas ratio $2l/m^3$ for all considered trials of experimental design. The interaction effect between the inlet duct spray and the filter was found to be important, which controls the droplet growth due to the droplet collisions between the duct- and scrubbing tower-spray. The presented methodology to analyze the impacts of operational and design factors on the scrubber efficiency showed potential for applications to optimize the future flue gas abatement process in semiconductor plants.

• The Journal of Information Systems
• /
• v.28 no.4
• /
• pp.1-25
• /
• 2019

Purpose The purpose of this study is to investigate cognitive mechanism of goal relations (Single-goal vs. Multiple-goals) and to-do list (Packing vs. Unpacking) and also verify the role of self-efficacy in the perspective of motivation belief. The perspective of cognitive mechanism is related to the effects of how the relations of multitasking environments affects to facilitating relation or conflicting relations. In pursuit of a single goal, judgement of task importance can be facilitated by unpacking effect due to relations of strongly associated project components including to-do list. On the other hands, in pursuit of multiple goals, judgement of task importance can be conflicted due to mutually exclusive relations of multiple goals. Additionally, the cognitive mechanism can be regulated from the role of self-efficacy, which contributes to motivation belief on how much a person is confident in achieving given tasks. In the end this research is to identify self-efficacy as boundary condition in inhibiting the effects of facilitation and conflict. Design/methodology/approach This study conducted Two-way ANOVA (Packing/ Unpacking * Single-goal/ Multiple-goals) to explore the effects of cognitive mechanism on task importance. After that we performed Three-way ANOVA, 2 (To-do list: Packing/ Unpacking) * 2 (Goal relation: Single-goal/ Multiple-goals) * 2 (Self-efficacy: Low self-efficacy/ High self-efficacy) to verify the role of self-efficacy between goal relations and to-do list. Findings In the cognitive mechanism, the task importance is not significantly different between in packed and in unpacked condition in pursuit of a single goal. But multitasking with multiple goals causes goal conflict, which means packed condition indicates significantly higher task importance than unpacked condition. Additionally, for a group with low self-efficacy unpacking leads to conflicting relation, which implies that packed condition is more efficient strategy than packed condition. On the other hands, in pursuit of mulitple goals, either packing or unpacking has no distinctive effects on task importance. However, participants with high self-efficacy are no longer affected by facilitating relation and conflicting relation as well in pursuit of either a single goal or multiple goals as well.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.21 no.10
• /
• pp.1935-1942
• /
• 2017

Recently, a compression algorithm is widely used as a method for compressing geographic information data. However, such a compression algorithm has a problem that the continuity of the map data is insufficient to actually apply it to the geographic information data compression, and the compression rate is lowered because it can not be compressed into a single data. Therefore, in this paper, we have designed and implemented a Run-Length / Byte-Packing compression algorithm that enables compression of geographic information by combining the advantages of compression algorithms and improves compression and restoration speed. As a result of evaluating the implemented algorithm, it was confirmed that the proposed algorithm improved about 5% on average compared with the existing compression algorithm, and it was confirmed that the compression rate and the restoration speed were improved.