Multi-functional Binder Systems for Enhanced Li-S Battery

Youngkwan Lee(이영관) 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.1

An investigation on the relationship between motion sickness susceptibility and visuospatial ability factors

Youngkwan Kwak,Woojin Park(박우진) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11

Objective: The objective of the current study was to investigate the relationship between motion sickness susceptibility and different factors of visuospatial ability. Background: Human visuospatial ability is conceptualized as consisting of multiple sub-components or factors. Such factors of visuospatial ability include: Visualization (VZ), Spatial Relations (SR), Closure Speed (CS), Flexibility of Closure (CF), and Perceptual Speed (P). Some research studies have identified associations/correlations between motion sickness and visuospatial ability suggesting some links between the two constructs. However, none of the previous studies have explored the possible relation between motion sickness susceptibility and visuospatial ability. Therefore, it can be understood in more detail by revealing a possible relationship between motion sickness susceptibility and components of visuospatial ability. The impact of these findings can have a wide range of implications for motion sickness research, especially in the field of visuospatial ability. However, the relationship between motion sickness and visuospatial ability still remains unclear. In particular, the relationships between motion sickness and individual factors of visuospatial ability have not been investigated sufficiently. An understanding of the relationships would inform future motion sickness research and in particular may contribute to developing training methods for reducing individuals’ motion sickness susceptibility. The objective of the current study was to empirically investigate the relationships between visuospatial ability factors and motion sickness susceptibility. Method: Fifty young adults (25 males and 25 females) were recruited for this study. Each participant was evaluated in motion sickness susceptibility and visuospatial ability. The Motion Sickness Susceptibility Questionnaire-Short Form (MSSQ-S) was employed for the motion sickness susceptibility evaluation. The ETS kit of Factor-referenced Cognitive tests (1976 Edition) was used for the evaluation of visuospatial ability. It evaluates an individual’s visuospatial ability in its five major components: Spatial Visualization (VZ), Spatial Relations (SR), Closure Speed (CS), Flexibility of Closure (CF), Perceptual Speed (P). The participants were divided into three motion sickness susceptibility groups (Low, Mid, and High). For each gender repeated-measures analyses of variance (ANOVA) and post-hoc pairwise comparisons were conducted to compare the three motion sickness susceptibility groups in each of the five visuospatial ability test scores. Results: For each gender ANOVA and post-hoc pairwise comparisons revealed significant differences among the Motion Sickness Susceptibility groups. The spatial visualization and spatial relation scores were positively correlated with the motion sickness susceptibility score. The total score of the visuospatial ability test was significantly higher in the low motion sickness susceptibility group compared to the high motion sickness susceptibility group. However, there was no significant gender differences in the visuospatial ability test score and the Percentile score MSSQ-S. Percentile score MSSQ-S was found to be associated with the spatial visualization, spatial relation scores and perceptual speed of the ETS kit of Factor-referenced Cognitive tests but not with gender. Conclusion: This study has revealed that motion sickness susceptibility was significantly and positively correlated with not all but part of the visuospatial ability factors (Spatial Visualization, Spatial Relation, and Perceptual Speed). This finding implies that motion sickness is affected by both visual information process speed and mental manipulation ability. However, further research is needed to investigate possible causality relationships between the visuospatial ability factors and motion sickness susceptibility. Application: This research identified the human visuospatial ability factors

Periodic Replacement of a System Subject to Shocks under Random Operating Horizon

Youngkwan Yoo 대한안전경영과학회 2021 대한안전경영과학회지 Vol.23 No.4

This paper presents a periodic replacement policy for a system subject to shocks when the system is operating for a finite random horizon. The system is subject to shocks during operation, and each shock causes downgrading of the system performance and makes it more expensive to run by the additional running cost. Shocks arrive according to a nonhomogeneous or a renewal process, and we develop periodic replacement policies under a finite random operating horizon. The optimum periodic replacement interval which minimizes the total operating cost during the horizon is found. Numerical examples are presented to demonstrate the results.

A Supervisory Control Algorithm for a Series Hybrid Vehicle With Multiple Energy Sources

Youngkwan Ko,Jeeho Lee,Hyeongcheol Lee IEEE 2015 IEEE Transactions on Vehicular Technology VT Vol.64 No.11

<P>This paper presents a new power distribution strategy (PDS) for a series electric hybrid vehicle (SHEV) in the sense of minimizing fuel usage. The target vehicle has three energy sources, i.e., an engine and generator set (EGS), a battery, and an ultracapacitor, and two traction motors for the front and rear wheels. A two-step PDS based on the real-time optimization technique is proposed to distribute the demand power among three energy sources. Several existing PDSs, such as the thermostat strategy and the power-follower strategy, are modified and applied to be compared with the proposed strategy. An optimal torque distribution strategy between front and rear traction motors is also proposed to minimize the electric energy consumption and to further improve fuel economy. Simulation results demonstrate the feasibility and effectiveness of the proposed strategies.</P>

Improving the Performances of Software for Rating Patent Technology : a Korean Case Study

Youngkwan Kwon,Tae-Kyu Ryu,Jong Bok Park 보안공학연구지원센터 2013 International Journal of Software Engineering and Vol.7 No.3

Regulation of IL-18 by CRH in mouse microglial cells

Pyungkeun Myung,Youngkwan Kim,Yunsil Choi,Yoolhee Yang,Eunsil Hahm,Youngin Kim,Jaeseung Kang,Wangjae Lee,Innoc Han,Daeho Cho,Hyunjeong Park,Hyungsik Kang 대한약학회 2004 大韓藥學會 總會 및 學術大會 Vol.2004 No.2

메모리 모듈의 데이터 채널 해석

홍영관(Youngkwan Hong),박철홍(Cheolhong Park),권기영(Kee-Young Kwon),기장근(Jang-Geun Ki),조현묵(Hyun-Mook Cho),이일규(Il-Kyoo Lee),김문정(Moonjung Kim) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11

대규모 유통업자의 PB상품 유통 관련 공정거래법 집행상의 쟁점 및 규제방안 고찰

권영관(Youngkwan Kwon) 한국규제학회 2019 규제연구 Vol.28 No.1

최근 확산되고 있는 대규모 유통업자들의 자체브랜드(Private Brand: PB) 상품 판매가 소비자들에게 양질의 상품을 저렴하게 구입할 수 있는 기회를 제공하여 소비자 후생이나 경쟁에 긍정적인 영향을 미칠 수 있다. 그러나 다른 한편으로 대규모 유통업자들은 PB상품을 개발․판매함으로써 상류 제조업자들과 경쟁관계를 형성하여 구매자로서의 우월적 교섭력을 더욱 강화할 수 있으며, 경우에 따라서는 PB상품 유통이 소비자 후생이나 공정거래 측면에서 부정적인 영향을 초래할 가능성 역시 완전히 배제할 수는 없다. 이에 본 논문에서는 PB상품 유통과 관련하여 대규모 유통업자의 우월적인 구매자 힘이 남용되는 것을 방지하기 위하여 현행 공정거래법 등을 통한 규제 가능성 및 한계점을 살펴보고 공정거래법을 집행함에 있어 가능한 대안을 고찰하였다. 즉, 대규모 유통업자가 상류제조업자들에 대한 구매자로서의 시장지배적 지위 남용 문제, 경쟁 NB상품 제조업자들에 대한 경쟁제한행위 및 불공정거래행위 등을 판단함에 있어 PB상품 유통 여부 및 전체 매출액에서 PB상품이 차지하는 비중 등을 추가적으로 고려할 필요가 있을 것이다. PB products served by large-scare distributors may have a positive effect on consumer welfare and market competition because their distribution gives comsumer opportunities to purchase good quality products with competitive prices. However, large-scale distributors can enhance their superior bargaining power as a buyer to upstream suppliers by selling their PB products and forming rivalry, and thus PB products distribution by large-scale distributors might negatively influence in terms of consumer welfare and fair trade. This paper investigated possible regulatory measures in enforcing fair trade act against the abuse of superior buyer power of large-scale distributors in relation to their PB products delivery by examining the regulations of current acts and their limits. The paper suggests that it is desirable for the competition authority to consider whether large-scale distributors distribute their own PB products or not and the shares of them to overall sales of large-scale distributors, etc. when it determines the abuse of market dominance of large-scale distributors as a buyer to upstream suppliers, anticompetitive or the unfair trade conducts to upstream manufacturers producing NB products competing their PB products.

인터넷 방송용 스트리밍 서버 비교 분석

강영관(Youngkwan Kang),김근형(Geunhyung Kim) 한국멀티미디어학회 2007 한국멀티미디어학회 학술발표논문집 Vol.2007 No.2

선별유통과 제3자 온라인 플랫폼을 통한 판매제한 행위에 관한 공정거래법적 규제 연구

권영관 ( Youngkwan Kwon ) 한국질서경제학회 2019 질서경제저널 Vol.22 No.2

구매의 편리함과 더불어 제품선택의 다양성, 제품구매 가격 측면에서의 장점으로 인해 인터넷을 통한 소비자들의 제품구매가 급속도로 성장하고 있는 반면 제조 또는 공급업자들이 자사 제품을 유통하는 유통업자들의 인터넷 유통을 제한을 하는 경우가 발생하여 경쟁법적 측면에서 문제가 발생하곤 한다. 그러한 경우는 특히 선별유통시스템(Selective Distribution System) 하에서 제조업자와 유통업자 사이에서 중요한 이슈로 부각되고 있다. 국내에서는 아직까지 선별유통시스템에 대한 연구와 논의가 극히 제한적으로만 이루어지고 있지만, 특히 유럽에서는 명품 등 브랜드 가치가 중요한 상품에 대해 공급(제조)업자가 자사상품의 유통시장에 참여하고자 하는 유통업자를 선별하거나 선별된 유통업자가 제3자 온라인 유통플랫폼을 통해 유통하는 것을 제한함으로써 발생하는 갈등이 경쟁법적 측면에서 중요하게 다루어지고 있는 상황이다. 국내에서도 최근 공급(제조)업자가 계약 상대방인 유통업자가 제3자 온라인 플랫폼을 통해 제품을 판매하는 것을 전면적으로 금지하여 문제가 된 공정거래 사건에 대한 대법원 판결이 내려진 바 있다. 이에 본 연구에서는 아직까지 국내에서 관련된 공정거래법 집행 사례들이 축적되어 있지 않은 상황에서 관련 사건에 대한 심결례와 판례 등이 다양하게 축적되어 있는 EU의 사건 및 규범, 국내의 관련 사건들에 대한 비교 분석을 통하여 향후 관련 행위에 대한 효과적이고 바람직한 공정거래법 규제를 위한 시사점을 논하였다. E-commerce is growing quickly because of its advantages in terms of the purchase convenience, diversity of available products, and their price competitiveness. However, manufacturers supplying their products with distributors often restrict their distributors not to sale their products through internet platforms, and thus this practice can cause some problems in terms of competition or fair trade law. In particular, this problematic practice has become an emerging issue between manufacturers and distributors under the selective distribution system. There are limits of researches and discussions on the selective distribution system in Korea, but conflicts regarding selection of distributors by manufacturers and their vertical distributive restrictions through third-party online platform by their selected distributors have been dealt in terms of competition law in EU or its member states. In European region, the selective distribution system has been recognized as a legal distributional system if it meets three requirements which were suggested by the ECJ in the case of Metro/SABA. In particular, the characteristics of products in problem is critical in determining the legality of the selective distribution system. And its judgement of Pierre Fabre is a seminal case that dealt with the legality of restricting distributors’ sales of products on the Internet by suppliers in EU. The state of art seminal case focusing on the problematic practice regarding distributive restriction using the third-party internet platform by suppliers is a Coty judgement by ECJ, which provide us with important implications in terms of enforcing Fair Trade Law in Korea. In Korea, recently, there exist some cases of the suppliers’ problematic practice banning distributors’ sales through the third-party internet platform, and one of them was ruled by the supreme court of Korea. This paper investigated the seminal case laws on the selective distribution as well as the vertical restriction of internet distribution of products by suppliers in EU and its member states, and then discussed the rulings in Korea and its limits in terms of effective and desirable enforcement of Fair Trade Law in Korea by comparative analysis of these rulings in Korea and EU. In addition, this paper discussed how to effectively regulate the vertical distributional restriction of products sales through the third-party internet platforms under Korean Fair Trade Law.