Analysis of Relative Importance on Electric Vehicle Conversion Intention : Comparing China and Korea

권철환(Kwon, Chulhwan),박종우(Park, Jongwoo) 글로벌경영학회 2021 글로벌경영학회지 Vol.18 No.2

운송부문은 전체 대기오염물질 배출의 큰 비중을 담당한다. 대기오염물질 배출을 획기적으로 죽이는 방법으로 전기차가 도입되었지만, 여전히 전기차 판매는 저조하고, 화석연료를 사용하는 기존의 자동차들에 비해 상당히 적은 수가 운행 중이다. 여러 선행연구가 전기차로의 전환의도를 연구했으나, 영향요인을 포괄적인 접근으로 도출하고 분석한 연구는 적다. 이러한 한계를 극복하기 위해 새로운 연구가 필요하다. 한국에서 수집한 데이터에 대한 AHP 분석 결과, 차원에 대하여 제품품질(40.9%), 정책 지원(27.3%), 시장 환경(18.1%), 소비의식(13.7%) 순으로 전기차로의 전환의도에 영향을 미치는 것으로 나타났으며, 요인의 경우 신뢰성과 내구성(13.7%), 구매 보조금(11.1%), 성능(10.1%)의 순으로 높은 영향을 미치는 것으로 나타났다. 중국의 경우 정책 지원(54.8%), 소비의식(33.1%), 제품 품질(7.4%), 시장 환경(4.7%) 순으로 영향정도가 나타났으며, 요인은 정부 규제(38.7%), 자원 절약(26.7%), 구매 보조금(7.8%) 순으로 높은 영향을 미치는 것으로 나타났다. 본 연구는 정책 결정을 위한 가이드 라인을 제시하는 한편, 자동차 제조업체의 전략 수립을 위한 기초 데이터를 제공하는데 의의가 있다. 또한, 전기차의 친환경성과 경제성에 중점을 둔 선행 연구와 달리 본 논문은 신뢰성과 내구성, 자원 절약 등의 새로운 영향요인을 제시 할 수 있었다. 마지막으로 문화적으로 구분되는 두 표본의 비교를 통해 본 연구는 수출의 상황에 대비한 지침을 제공할 수 있었다. The transportation sector is responsible for a large quantity of air pollutant emission. While electric vehicles are introduced as a method to dramatically reduce air pollutant emission, the sales of electric vehicles are relatively low compared to traditional vehicles running on fossil fuel. Past studies have analyzed the factors influencing the conversion intention of electric vehicles. However, they share the limitation of not being able to examine the subject in a comprehensive approach, bringing up the need for a new research. AHP analysis conducted on the data collected for Korea showed the relative effect of dimensions as product quality (40.9%), policy support (27.3%), market environment (18.1%), and consumption consciousness (13.7%). For the factors, reliability and durability (13.7%), purchase subsidies (11.1%), and performance (10.1%) showed an especially high effect on the conversion intention. For the case of China, results showed the relative effect of dimensions as policy support (54.8%), consumption consciousness (33.1%), product quality (7.4%), and market environment (4.7%). For the factors, governmental regulation(38.7%), Resource Saving(26.7%), and purchase subsidies(7.8%) showed an especially high effect compared to other factors. The study provides a guideline for policy making and the basis data for strategy establishment of automakers. Also, in contrast to former research that mainly concentrated on the eco-friendliness and economic aspect of electric vehicles, this paper was able to define the importance of reliability and durability, and resource saving as an influencing factor, providing a new direction for improvement. In addition, with the comparison of two culturally distinct groups, the study was able to provide a guideline for exporting situations.

Synthesis of Truncated DNA Aptamer and Its Application to an Electrochemical Biosensor Consisting of an Aptamer and a MXene Heterolayer for Yellow Fever Virus

Kwon Nayeon,Lee Siyun,Jang Moonbong,Lee Jin-Ho,Park Chulhwan,Lee Taek 한국바이오칩학회 2024 BioChip Journal Vol.18 No.1

Yellow fever virus (YFV) is an acute infectious virus with high morbidity and mortality risks during the toxic phase. Early diagnosis and suppression are essential because YFV has no precise treatment. With the aim of detecting YFV, we fabricated a highly sensitive electrochemical biosensor comprised with a truncated DNA aptamer/MXene heterolayer. The synthesized DNA aptamer was prepared by systematic evolution of ligands using the exponential enrichment (SELEX) technique, which can specifically detect the YFV NS1 protein. MXenes increase the electrical sensitivity and the possibility of attachment of aptamers by widening the surface area. The aptamer-cutting process which called a truncation process can reduce the production cost of biosensors. The biosensor performance was evaluated using electrochemical methods, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The limit of detection (LOD) was 2.757 pM for YFV diluted in phosphate-buffered saline (PBS) and 2.366 pM for YFV diluted in 10% human serum, proving that the biosensor specifically binds to YFV through selectivity evaluation. This biosensor can be a valuable tool for the early diagnosis of YFV, enabling timely intervention as well as facilitating the control and prevention of yellow fever outbreaks.

The Effect of Na on CIGS Module Performance

JinWoo Lee,ChulHwan Choi,KyoungHo Kang,MinJung Shin,SeHan Kwon,윤재호 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.12

We fabricated matched pairs of Cu(In_1−x,Ga_x)Se₂ (CIGS) solar cell devices on two different substrates with different Na levels. The effect of Na from the glass substrates on the CIGS device performance was investigated. We found clear evidence of performance enhancement due to Na especially for samples grown at higher temperatures. A comparison of the secondary ion mass spectroscopy (SIMS) profiles indicated the additional presence of alkali K atoms for devices on photovoltaic (PV)-specialty glass substrates. Novel reverse-bias-induced breakdown measurements were carried out to quantitatively characterize the quality of the junction interface due to the level of Na out-diffusion at higher growth temperatures.

Recent Progress in Rapid Biosensor Fabrication Methods: Focus on Electrical Potential Application

Yoon Yejin,Kwon Yein,Park Hanbin,Lee Siyun,Park Chulhwan,Lee Taek 한국바이오칩학회 2024 BioChip Journal Vol.18 No.1

The coronavirus disease pandemic has led to an urgent need for rapid and accurate viral diagnosis. Therefore, rapid biosen- sors, not only for viruses but also for the detection of bacteria, disease diagnosis, and environmental monitoring, have been actively researched. Biosensors analyze the binding of biomolecules and target substances mainly based on electrochemical, electrical, or optical methods. To achieve precise and rapid diagnosis, it is crucial to reduce the time required for biomolecule– target substance binding. Typically, biomolecules reach the target substances through random diffusion, and to overcome the limitations associated herewith, biosensors have been integrated with alternating current (AC) electrokinetics (ACEK) technology. ACEK, through the application of alternating voltages, converts electrical energy into fluid motion, inducing pumping, mixing, concentration, and separation of the fluid. Its low power consumption makes it highly promising as a point-of-care diagnostic device. In this paper, we review the advancements in three ACEK technologies: AC electrothermal flow, AC electro-osmosis, and AC di-electrophoresis, to discuss the development of rapid biosensor fabrication methods based on electrical potential applications. The coronavirus disease pandemic has led to an urgent need for rapid and accurate viral diagnosis. Therefore, rapid biosen- sors, not only for viruses but also for the detection of bacteria, disease diagnosis, and environmental monitoring, have been actively researched. Biosensors analyze the binding of biomolecules and target substances mainly based on electrochemical, electrical, or optical methods. To achieve precise and rapid diagnosis, it is crucial to reduce the time required for biomolecule– target substance binding. Typically, biomolecules reach the target substances through random diffusion, and to overcome the limitations associated herewith, biosensors have been integrated with alternating current (AC) electrokinetics (ACEK) technology. ACEK, through the application of alternating voltages, converts electrical energy into fluid motion, inducing pumping, mixing, concentration, and separation of the fl uid. Its low power consumption makes it highly promising as a point-of-care diagnostic device. In this paper, we review the advancements in three ACEK technologies: AC electrothermal flow, AC electro-osmosis, and AC di-electrophoresis, to discuss the development of rapid biosensor fabrication methods based on electrical potential applications.

Biodiesel production from various oils under supercritical fluid conditions by Candida antartica lipase B using a stepwise reaction method.

Lee, Jong Ho,Kwon, Cheong Hoon,Kang, Jeong Won,Park, Chulhwan,Tae, Bumseok,Kim, Seung Wook Humana Press ; Humana Press ; OCLC 2009 Applied biochemistry and biotechnology Vol.156 No.1

<P>In this study, we evaluate the effects of various reaction factors, including pressure, temperature, agitation speed, enzyme concentration, and water content to increase biodiesel production. In addition, biodiesel was produced from various oils to establish the optimal enzymatic process of biodiesel production. Optimal conditions were determined to be as follows: pressure 130 bar, temperature 45 degrees C, agitation speed 200 rpm, enzyme concentration 20%, and water contents 10%. Among the various oils used for production, olive oil showed the highest yield (65.18%) upon transesterification. However, when biodiesel was produced using a batch system, biodiesel conversion yield was not increased over 65%; therefore, a stepwise reaction was conducted to increase biodiesel production. When a reaction medium with an initial concentration of methanol of 60 mmol was used and adjusted to maintain this concentration of methanol every 1.5 h during biodiesel production, the conversion yield of biodiesel was 98.92% at 6 h. Finally, reusability was evaluated using immobilized lipase to determine if this method was applicable for industrial biodiesel production. When biodiesel was produced repeatedly, the conversion rate was maintained at over 85% after eight reuses.</P>

Determinants of Continuance Intention in Mobile Payment Services: Based on the IS Success Model

( Viyada Itthiphone ),( Donghyuk Jo ),( Chulhwan Kwon ) 한국인터넷정보학회 2020 인터넷정보학회논문지 Vol.21 No.5

Highly competitive environment has been forcing e-commerce industries to seek strategies to achieve competitive advantages. Mobile payment is a kind of service that allows mobile phone user to easily and conveniently initiate payments and transfer funds using their mobile phone anytime, and anywhere. This study is designed to identify factors that affect the intention of continued use of mobile payment services between users in Korea and Laos. As a result, first, in the case of Korean consumers, system quality, information quality and service quality were shown to have a positive effect on trust and satisfaction. In addition, trust and satisfaction were shown to have a positive effect on continuance intention. Second, in the case of Laotian consumers, system quality and service quality were shown to have a positive effect on trust, and system quality and information quality were shown to have a positive effect on satisfaction. In addition, trust and satisfaction were shown to have a positive effect on continuance intention. The study has its implications by analyzing factors affecting the continuance intention with the comparison of the customers from a developed nation and a developing nation, providing a direction of development for developing competitive advantages for those in development. For the developed, the study provides a guideline of what to modify and supplement in cases of entering the markets of developing nations.

Investigation of Enzyme Stability of Enzymatic Synthesis of Puerarin Palmitate Using Immobilized Thermomyces lanuginosus Lipase

Hyeseon LEE,Eunjeong YANG,Hyeok Ki KWON,Chulhwan PARK 한국생물공학회 2023 한국생물공학회 학술대회 Vol.2023 No.10

Bacterial cellulose production by Gluconacetobacter xylinus ATCC 53524 through OVAT method

Ha Eun KIM,Jeongbae SEO,Hee Kean KWON,Hong Seok KIM,Seung Hwan SHIN,Dam KO,Seung Joo YANG,Hah Young YOO,Chulhwan PARK 한국생물공학회 2017 한국생물공학회 학술대회 Vol.2017 No.10

스마트 기기 탑재 단안카메라를 이용한 객체 위치 추정

이지상(Lee, Jisang),호현주(Ho, Hyunju),김철환(Kim, Chulhwan),권영목(Kwon, Youngmok),손홍규(Sohn, Hong-Gyoo) 대한토목학회 2021 대한토목학회 학술대회 Vol.2021 No.10

Effect of Temperature and Solvents on Enzymatic Synthesis of Naringin Ester

Eunjeong YANG,Kyeonga KIM,Hyeseon LEE,Hyeok ki KWON,Chulhwan PARK 한국생물공학회 2023 한국생물공학회 학술대회 Vol.2023 No.4