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Article ; Online: Investigating psychological and motivational predictors of problematic smartphone use among Smartphone-based Social Networking Service (SNS) users.

Kwak, Min-Jung / Kim, Dai-Jin

2023 Volume 18, Page(s) 100506

Abstract: Given that the active use of certain smartphone applications is associate with problematic smartphone use, it has been proposed that certain smartphone applications are more addictive than others, such as Social Networking Services (SNS). Still, studies ... ...

Abstract	Given that the active use of certain smartphone applications is associate with problematic smartphone use, it has been proposed that certain smartphone applications are more addictive than others, such as Social Networking Services (SNS). Still, studies that consider smartphone users' main usage application which are known to influence the users' problematic smartphone use, such as SNS, remain to be explored. Thus, the current study aims to investigate the psychological and motivational predictors of problematic smartphone use in a sample of smartphone-based SNS users whose main device usage is SNS. A series of mean comparison tests and binary logistic regression were performed in this study. Of the 433 smartphone-based SNS users, 218 were male (50.3%) and 215 were female (49.7%). Age of 433 participants ranged from 20 to 40, and mean age was 30.75 (SD = 7.84). 73 participants (16.9%) were sorted into the high-risk problematic smartphone use group and 360 participants (83.1%) were categorized as the normal user group. The finding from binary regression analysis showed that reward responsiveness from the Behavioral Activation System (BAS), a lack of self-control, and anxiety significantly increased the odds of problematic smartphone use of the smartphone-based SNS users. Reward responsiveness was found to be the most powerful predictor. Our findings broaden the existing literature and provide implications to reduce addictive smartphone use relating to smartphone-based SNS usage.
Language	English
Publishing date	2023-06-21
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	2831558-3
ISSN	2352-8532 ; 2352-8532
ISSN (online)	2352-8532
ISSN	2352-8532
DOI	10.1016/j.abrep.2023.100506
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Article ; Online: Evaluating the circularity and multi-lifecycle green profit of product family design

Kang, Sora / Hong, Yoo Suk / Kwak, Minjung

Resources, Conservation & Recycling. 2023 Oct., v. 197 p.107106-

2023

Abstract: As sustainability and circularity are emerging as the new normal for business, manufacturers have attempted to apply recovery strategies such as reuse, remanufacturing, and recycling to product family design to generate higher profits and mitigate the ... ...

Abstract	As sustainability and circularity are emerging as the new normal for business, manufacturers have attempted to apply recovery strategies such as reuse, remanufacturing, and recycling to product family design to generate higher profits and mitigate the environmental impact. Compared to single-product design, product family design involves developing sharing decisions in which components and operations are common across product variants. However, existing approaches have not clearly explained the multi-lifecycle effects of sharing decisions. This paper proposes an evaluation model that quantifies the multi-lifecycle economic profit and environmental impact of a product family design. A bi-objective optimization model with economic and environmental objectives is developed to assess the effects of sharing over multiple lifecycles. The evaluation results provide a broader understanding of the multi-lifecycle effect of component and operation sharing and the trade-off between economic profit and environmental impact. This study considers a smartphone family design case to validate the proposed model.
Keywords	environmental impact ; mobile telephones ; models ; Product family design ; Circular economy ; Remanufacturing ; Design for lifecycle ; Design optimization ; Green design
Language	English
Dates of publication	2023-10
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	1498716-8
ISSN	0921-3449
ISSN	0921-3449
DOI	10.1016/j.resconrec.2023.107106
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: The Role of Motivation Systems, Anxiety, and Low Self-Control in Smartphone Addiction among Smartphone-Based Social Networking Service (SNS) Users.

Kwak, Min-Jung / Cho, Hyun / Kim, Dai-Jin

International journal of environmental research and public health

2022 Volume 19, Issue 11

Abstract: Given that Social Networking Service (SNS) has emerged as the most influential platform, which can lead users to addictive smartphone use, it is necessary to investigate which psychological variables lead smartphone-based SNS users to addictive ... ...

Abstract	Given that Social Networking Service (SNS) has emerged as the most influential platform, which can lead users to addictive smartphone use, it is necessary to investigate which psychological variables lead smartphone-based SNS users to addictive smartphone use. Still, studies on the relationship between psychological variables and addictive smartphone use among smartphone-based SNS users remain to be explored. Therefore, this study aims to investigate the role of psychological factors on smartphone addiction proneness (SAP). A total of 433 smartphone-based SNS users were collected from 5003 adults in Korea. Data were analyzed with descriptive statistics, Pearson's correlation coefficients, and path analysis using SPSS 21.0 and AMOS 23.0. The results of a parallel-mediation path analysis demonstrated that Behavioral Inhibition (BIS), Behavioral activation (BAS) drive, anxiety, and low self-control directly influenced SAP, separately. BIS and BAS _drive also had significant indirect effects on SAP through the effect of anxiety. BIS and BAS_fun had significant indirect effects on SAP through the effect of low self-control. The study variables accounted for 38.4 of the total variances of SAP. Thus, when establishing interventions to reduce the users' addictive smartphone use, these interactive relationships of the variables should be considered.
MeSH term(s)	Adult ; Anxiety ; Behavior, Addictive/psychology ; Humans ; Internet Addiction Disorder ; Motivation ; Self-Control/psychology ; Smartphone ; Social Networking
Language	English
Publishing date	2022-06-05
Publishing country	Switzerland
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph19116918
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Optimal Line Design of New and Remanufactured Products: A Model for Maximum Profit and Market Share with Environmental Consideration

Kwak, Minjung

Sustainability. 2018 Nov. 19, v. 10, no. 11

2018

Abstract: For original equipment manufacturers (OEMs), producing a line of new and remanufactured products can be an effective strategy for improving the sustainability of their business. The potential cannibalization of new product sales and the technological ... ...

Abstract	For original equipment manufacturers (OEMs), producing a line of new and remanufactured products can be an effective strategy for improving the sustainability of their business. The potential cannibalization of new product sales and the technological obsolescence of used products, however, can create barriers for OEMs to embrace remanufacturing. In order to address these challenges in OEM remanufacturing, this paper proposes a mixed-integer programming model for the optimal line design of new and remanufactured products. Aiming at two objectives, i.e., maximizing the total profit and maximizing the total market share, the model simultaneously optimizes a line of new and remanufactured products in terms of their (1) design specifications (including an upgrade plan for the remanufactured product), (2) selling prices, and (3) production quantities and the detailed production plan. With the simultaneous optimization, the model suggests an optimal way of differentiating the new and remanufactured products in order to overcome the cannibalization and obsolescence effects and to maximize the total profit and/or market share. The model also accounts for environmental impact, stipulating that the total environmental impact of manufacturing remains under a certain limit. To demonstrate the applicability and effectiveness of the model, a case study is presented using the example of a desktop computer.
Keywords	case studies ; computers ; environmental impact ; equipment ; manufacturing ; market prices ; market share ; models ; sales
Language	English
Dates of publication	2018-1119
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2518383-7
ISSN	2071-1050
ISSN	2071-1050
DOI	10.3390/su10114283
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Effect of Area-Level Deprivation on Cancer Survival Time: A Register-Based Follow-up Study of 145 585 Korean Subjects.

Kwak, Minjung / Kim, Changhoon

Asia-Pacific journal of public health

2017 Volume 30, Issue 1, Page(s) 19–28

Abstract: Our goal is to evaluate the strengths of the associations between area-level deprivation and survival time for a variety of cancers. A total of 145 585 subjects were diagnosed with various cancers in Busan, Korea, and an area-level deprivation index ... ...

Abstract	Our goal is to evaluate the strengths of the associations between area-level deprivation and survival time for a variety of cancers. A total of 145 585 subjects were diagnosed with various cancers in Busan, Korea, and an area-level deprivation index constructed from several important socioeconomic variables. A multilevel Cox model was used in the analysis to investigate the effects of multiple risk factors. After adjusting for gender and age, an increased area-level deprivation index was found to be significantly associated with a higher hazard rate for major cancers. Estimated hazard ratios (95% confidence interval) were 1.08 (1.06, 1.11), 1.15 (1.13, 1.18), and 1.22 (1.18, 1.25) for the second, third, and fourth quartiles of deprivation index groups, respectively, when compared with the least deprived group. When compared with the least deprived group, the more deprived group showed significant decrease in survival time for major cancers. This finding highlights the importance of preventive and care services incorporating socioeconomic characteristics of areas.
MeSH term(s)	Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; Female ; Follow-Up Studies ; Health Status Disparities ; Humans ; Infant ; Infant, Newborn ; Male ; Middle Aged ; Neoplasms/mortality ; Poverty Areas ; Proportional Hazards Models ; Registries ; Republic of Korea/epidemiology ; Risk Factors ; Socioeconomic Factors ; Survival Analysis ; Young Adult
Language	English
Publishing date	2017-12-07
Publishing country	China
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1025444-4
ISSN	1941-2479 ; 1010-5395
ISSN (online)	1941-2479
ISSN	1010-5395
DOI	10.1177/1010539517746043
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Article ; Online: Disparities by Age, Sex, Tumor Stage, Diagnosis Path, and Area-level Socioeconomic Status in Survival Time for Major Cancers: Results from the Busan Cancer Registry.

Kwak, Minjung / Kim, Changhoon

Journal of Korean medical science

2017 Volume 32, Issue 12, Page(s) 1974–1983

Abstract: Our goal was to examine the effect of area-level deprivation on patient survival time for seven major cancers - stomach, colon, liver, lung, breast, cervix, and thyroid cancer. Data on 10,902 subjects who were diagnosed with major cancers from 2010 and ... ...

Abstract	Our goal was to examine the effect of area-level deprivation on patient survival time for seven major cancers - stomach, colon, liver, lung, breast, cervix, and thyroid cancer. Data on 10,902 subjects who were diagnosed with major cancers from 2010 and 2011 in Busan were collected regarding the survival time along with several important prognostic factors and an area-level deprivation index was constructed from education, income, unemployment, and welfare assistance, to assess the comprehensive area-level socioeconomic status. A multilevel Cox proportional hazard model was used to investigate the effects of multiple risk factors such as gender, age, tumor stage, diagnosis path, and the area-level deprivation. After adjusting for risk factors the area-level deprivation index was found to be significant in associating with higher hazard rate for several cancers. Estimated hazard ratios (95% CI) were 1.08 (0.99-1.18), 1.23 (1.12-1.36), 1.36 (1.21-1.53) for the second, the third, and the fourth quartile of deprivation index groups, respectively, when compared to the least deprived group. When compared with the least deprived group, the more deprived group showed significant decrease in survival time for major cancers. This novel finding may contribute to the literature regarding the association of area-level socioeconomic status and highlight the importance of careful monitoring of socioeconomic characteristics for cancer prevention and care services.
Language	English
Publishing date	2017-12
Publishing country	Korea (South)
Document type	Journal Article
ZDB-ID	639262-3
ISSN	1598-6357 ; 1011-8934
ISSN (online)	1598-6357
ISSN	1011-8934
DOI	10.3346/jkms.2017.32.12.1974
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Article ; Online: Optimal two-stage log-rank test for randomized phase II clinical trials.

Kwak, Minjung / Jung, Sin-Ho

Journal of biopharmaceutical statistics

2017 Volume 27, Issue 4, Page(s) 639–658

Abstract: Randomized controlled clinical trials are conducted to determine whether a new treatment is safe and efficacious compared to a standard therapy. We consider randomized clinical trials with right censored time to event endpoint, called survival time here. ...

Abstract	Randomized controlled clinical trials are conducted to determine whether a new treatment is safe and efficacious compared to a standard therapy. We consider randomized clinical trials with right censored time to event endpoint, called survival time here. The two-sample log-rank test is popularly used to test if the experimental therapy has a longer survival distribution than the control therapy or not. We consider an early stopping for futility only or for both futility and efficacy. For planning such clinical trials, this article presents two-stage designs that are optimal in the sense that either the maximal sample size or the expected sample size when the experimental therapy is futile or superior is minimized under the given type I and II error rates. Optimal designs for a range of design parameters are tabulated and evaluated using simulations.
Language	English
Publishing date	2017
Publishing country	England
Document type	Journal Article
ZDB-ID	1131763-2
ISSN	1520-5711 ; 1054-3406
ISSN (online)	1520-5711
ISSN	1054-3406
DOI	10.1080/10543406.2016.1167073
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Article: Clustering of longitudinal interval-valued data via mixture distribution under covariance separability.

Park, Seongoh / Lim, Johan / Choi, Hyejeong / Kwak, Minjung

Journal of applied statistics

2019 Volume 47, Issue 10, Page(s) 1739–1756

Abstract: We consider the clustering of repeatedly measured 'min-max' type interval-valued data. We read the data as matrix variate data and assume the covariance matrix is separable for the model-based clustering (M-clustering). The use of a separable covariance ... ...

Abstract	We consider the clustering of repeatedly measured 'min-max' type interval-valued data. We read the data as matrix variate data and assume the covariance matrix is separable for the model-based clustering (M-clustering). The use of a separable covariance matrix introduces several advantages in M-clustering, which include fewer samples required for a valid procedure. In addition, the numerical study shows that this structured matrix allows us to find the correct number of clusters more accurately compared to other commonly assumed covariance matrices. We apply the M-clustering with various covariance structures to clustering the longitudinal blood pressure data from the National Heart, Lung, and Blood Institute Growth and Health Study (NGHS).
Language	English
Publishing date	2019-11-17
Publishing country	England
Document type	Journal Article
ZDB-ID	1476802-1
ISSN	1360-0532 ; 0266-4763
ISSN (online)	1360-0532
ISSN	0266-4763
DOI	10.1080/02664763.2019.1692795
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Article: Green profit maximization through integrated pricing and production planning for a line of new and remanufactured products

Kwak, Minjung / Harrison Kim

Journal of cleaner production. 2017 Jan. 20, v. 142

2017

Abstract: To achieve a “green profit” in their businesses, original equipment manufacturers (OEMs) who produce both new and remanufactured products must optimize their pricing and production decisions. They must determine the buyback price and takeback quantity of ...

Abstract	To achieve a “green profit” in their businesses, original equipment manufacturers (OEMs) who produce both new and remanufactured products must optimize their pricing and production decisions. They must determine the buyback price and takeback quantity of end-of-life products (i.e., supply) as well as the selling prices and production quantities of new and remanufactured products (i.e., demand). Detailed production plans for matching the supply and demand should be optimized as well. This paper addresses the lack of a model to deal with buyback pricing, sales pricing, and production planning in an integrated manner. Considering their mutual dependence, the total profit cannot be maximized without optimizing all three simultaneously. This paper presents a model for integrated pricing and production planning for a line of new and remanufactured products in a competitive market. A mixed-integer programming model is proposed that assumes a buyback program as a takeback strategy and optimizes the buyback prices, selling prices, and detailed production plans simultaneously. A transition matrix is used to coordinate pricing and production planning reflecting the design of products. The main objective is to maximize the total profit, but the model also considers how much environmental impact can be avoided by remanufacturing. With the help of the model, OEMs can identify an optimal line of new and remanufactured products that can maximize their total profit while achieving environmental-impact saving greater than a target. By enforcing incrementally increasing environmental targets, OEMs can also explore multiple green profit opportunities that can create greater profits and increased environmental-impact savings than producing new products only. To demonstrate the proposed model, this paper presents a case study with a smartphone example.
Keywords	business enterprises ; case studies ; environmental impact ; equipment ; markets ; models ; new products ; planning ; prices ; profit maximization ; sales ; supply balance
Language	English
Dates of publication	2017-0120
Size	p. 3454-3470.
Publishing place	Elsevier Ltd
Document type	Article
ISSN	0959-6526
DOI	10.1016/j.jclepro.2016.10.121
Database	NAL-Catalogue (AGRICOLA)

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Article: Effect of herbal medicine (Jodeungsan) on migraine: A double-blind randomized clinical trial.

Kim, Seyoung / Seo, Jihye / Kim, Cheol-Hyun / Sung, Hyun-Kyung / Go, Ho-Yeon / Jung, Woo Sang / Kwon, Seungwon / Kwak, Minjung / Lee, Sangkwan

Integrative medicine research

2022 Volume 11, Issue 4, Page(s) 100885

Abstract: Background: Migraine is a relatively common disease that has a significant effect on the daily activities of affected individuals. The purpose of this study was to explore the effects of herbal medicine (Jodeungsan, JDS) on migraine.: Methods: Sixty- ... ...

Abstract	Background: Migraine is a relatively common disease that has a significant effect on the daily activities of affected individuals. The purpose of this study was to explore the effects of herbal medicine (Jodeungsan, JDS) on migraine. Methods: Sixty-four patients with migraine were recruited and randomized to either the JDS or placebo group at a 1:1 ratio. The subjects received JDS or placebo daily for four weeks. The primary outcome was a change in the number of headache attack days (HADs), and the secondary outcome measures were the headache impact test (HIT), migraine-specific quality of life (MSQoL), the deficiency and excess pattern identification questionnaire (DEPIQ), the cold and heat pattern identification questionnaire (CHPIQ), and the blood stasis pattern questionnaire (BSPQ). Results: In all, 61 of the 64 patients took the investigational drugs for four weeks. The number of HADs did not significantly differ between the JDS and placebo groups at the end of the study. However, the HIT and MSQoL results showed significant improvement over the baseline in both groups. Conclusion: JDS did not have a significant effect on chronic migraine. Larger studies are needed to confirm this result. Trial registration: Clinical Research Information Service (https://cris.nih.go.kr/): KCT0003121.
Language	English
Publishing date	2022-08-05
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	2696588-4
ISSN	2213-4220
ISSN	2213-4220
DOI	10.1016/j.imr.2022.100885
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