Search results for: Jungjoo Lee

Items from 1 to 10 out of 10 results

article

The longitudinal relationship between levels of leisure‐time physical activity and positive and negative affect among older foreign‐born adults with mild cognitive impairment

Jungjoo Lee, Junhyoung Kim, Bomi Woo, Arto Pesola, more

Background The purpose of this study was to investigate the longitudinal impact of different levels of leisure‐time physical activity (LTPA) participation on positive and negative affect among older foreign‐born adults with mild cognitive impairment (MCI). Methods This study used 2012 to 2020 data from the Health and Retirement Study data (n = 1206) that was analyzed using repeated measured multivariate...

article

The longitudinal relationship between levels of cognitively stimulating leisure activity and positive and negative affect among older adults with MCI

Jungjoo Lee, Junhyoung Kim, Dubravka Svetina Valdivia

Psychogeriatrics > 24 > 2 > 369 - 381

Background The purpose of this study was to investigate the longitudinal relationship between different levels of cognitively stimulating leisure activity (CSLA) participation and different levels of positive and negative affect among older adults with mild cognitive impairment (MCI). Methods Using a repeated‐measured multivariate analysis of covariance (RM‐MANCOVA), this study analyzed the Health...

chapter

Cultural Difference and Its Effects on User Research Methodologies

Jungjoo Lee, Thu-Trang Tran, Kun-Pyo Lee

Lecture Notes in Computer Science > Usability and Internationalization. HCI and Culture > Part I: Cross-Cultural Design > 122-129

Various researches have proved that cultural differences affect the process and results of user research, emphasizing that should cultural attention be given in order to obtain sufficient results. After performing three experiment methods: probe, usability test, and focus group interview in the Netherlands and Korea, we discovered that productivity and effectiveness was poorer in Korea. The differences...

article

Novel foam injection molding technology using carbon dioxide‐laden pellets

Jungjoo Lee, Lih‐Sheng Turng, Eugene Dougherty, Patrick Gorton

Polymer Engineering & Science > 51 > 11 > 2295 - 2303

Injection molding of foamed components typically uses chemical blowing agents (CBAs) or physical blowing agents (PBAs) to produce a cellular or microcellular structure. A CBA can be easily and directly mixed with plastic pellets and fed into the molding machine through the hopper while a generally finer, microcellular structure can be realized using PBAs. The PBA route is accomplished by injecting...

article

A novel method for improving the surface quality of microcellular injection molded parts

Jungjoo Lee, Lih-Sheng Turng, Eugene Dougherty, Patrick Gorton

Polymer > 2011 > 52 > 6 > 1436-1446

Microcellular injection molding is the manufacturing method used for producing foamed plastic parts. Microcellular injection molding has many advantages including material, energy, and cost savings as well as enhanced dimensional stability. In spite of these advantages, this technique has been limited by its propensity to create parts with surface defects such as a rough surface or gas flow marks...

article

Processing and characterization of solid and microcellular PHBV/PBAT blend and its RWF/nanoclay composites

Alireza Javadi, Yottha Srithep, Jungjoo Lee, Srikanth Pilla, more

Composites Part A > 2010 > 41 > 8 > 982-990

Solid and microcellular components made of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/poly (butylene adipate-co-terephthalate) (PBAT) blend (weight ratio of PHBV:PBAT=30:70), recycled wood fiber (RWF), and nanoclay (NC) were prepared via a conventional and microcellular-injection molding process, respectively. Morphology, thermal properties, and mechanical properties were investigated. The...

article

Improving surface quality of microcellular injection molded parts through mold surface temperature manipulation with thin film insulation

Jungjoo Lee, Lih‐Sheng Turng

Polymer Engineering & Science > 50 > 7 > 1281 - 1289

Microcellular injection molding offers many advantages such as material and energy savings, reduced cycle times, and excellent dimensional stability. However, typical surface characteristics of microcellular injection molded parts—such as gas flow and swirl marks and a lack of smoothness—have precluded the process from being used for applications where surface appearance is important. This article...

article

Processing and characterization of microcellular PHBV/PBAT blends

Alireza Javadi, Adam J. Kramschuster, Srikanth Pilla, Jungjoo Lee, more

Polymer Engineering & Science > 50 > 7 > 1440 - 1448

article

Processing and characterization of solid and microcellular PHBV/coir fiber composites

Alireza Javadi, Yottha Srithep, Srikanth Pilla, Jungjoo Lee, more

Materials Science & Engineering C > 2010 > 30 > 5 > 749-757

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/coir fiber composites were prepared via both conventional and microcellular injection-molding processes. The surface of the hydrophilic coir fiber was modified by alkali- and silane-treatment to improve its adhesion with PHBV. The morphology, thermal, and mechanical properties were investigated. The addition of coir fiber (treated and untreated)...

article

Microcellular processing of polylactide–hyperbranched polyester–nanoclay composites

Srikanth Pilla, Adam Kramschuster, Jungjoo Lee, Craig Clemons, more

Journal of Materials Science > 2010 > 45 > 10 > 2732-2746

The effects of addition of hyperbranched polyesters (HBPs) and nanoclay on the material properties of both solid and microcellular polylactide (PLA) produced via a conventional and microcellular injection-molding process, respectively, were investigated. The effects of two different types of HBPs (i.e., Boltorn H2004^® and Boltorn H20^®) at the same loading level (i.e., 12%), and the same type of HBP...

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