Exploring the Determinants of MOOCs continuance intention

( Donghyuk Jo ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.8

In our current information-based society in which knowledge is a fundamental asset to production, the capability to utilize information and produce knowledge with the use of information technology (IT) has become essential to learning. Massive Open Online Courses (MOOCs) have recently been introduced in light of such changes and are recognized as an alternative to open education. MOOCs’ capabilities are being acknowledged in lifelong education in terms of reeducation and knowledge sharing, and also in terms of improving teaching quality, and improving university students’ levels of creativity and integrated thinking by supporting high-level content and teaching. Therefore, this study presents an extended research model that combines information system (IS) continuance and task-technology fit models. Our study researches previous literature, revealing factors of continuous use after accepting MOOCs from the learner’s perspective, and analyzes the model empirically. The ideal environment for MOOCs learners is evaluated, and a strategic approach to the successful settlement and diffusion of MOOCs is presented based on this study’s findings.

비 중첩 구조 인코넬 용접 벨로우즈 개발

조동혁(Donghyuk Jo),김현웅(HyunWung Kim),방정석(JeongSeok Bang),이병호(Byungho Rhee),신동순(DongSun Shin),한상엽(SangYeop Han) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11

본 논문은 롤 제어를 수행하는 용접 벨로우즈 개발에 관한 연구이다. 벨로우즈 개발은 소재 선정, 설계, 시제품제작, 검증시험 등의 과정으로 진행되었다. 소재는 강도, 내열성, 내식성이 뛰어난 Inconel(인코넬)를 사용하였고, 샘플 벨로우즈 제작 공정은 Left Membrane, Right Membrane을 성형한 후 Left Membrane, Right Membrane을 용접하여 CV(convolution)를 만들고 여러개의 CV(convoultion)를 용접하여 코어(Core)를 만든다. 코어(Core)상태에서 열처리 한 후 코어(Core) 끝단부 Adapter Ring을 용접하는 공정으로 제작하였다. 시제품 검증은 1.Left Membrane, Right Membrane 단품 검수, 2.Left Membrane, Right Membrane 용접부 검증, 3.열처리 검증, 4. 진원도 검증을 수행하였다. 위의 과정으로 제작된 샘플벨로우즈의 성능 테스트를 위한 치구 제작 후 기밀 시험, 모멘트 시험, 수명시험을 수행하였고 열환경 수명시험을 진행하였다. In this paper, it is a study on the development of welding bellows for roll control. Bellows development process was conducted in the order of the material selection, design, verification test. We were using the Inconel material with excellent strength, heat resistance, corrosion resistance. Bellows sample manufacturing process ; Left Membrane and Right Membrane press forming, Left Membrane and Right Membrane welded to make a CV(convolution), makes the core by welding multiple CV(convolution), Core heat treatment after the adapter Ring welding. Bellows sample verification procdures ; 1. Inspection of Left Membrane and Right Membrane. 2. Welding inspection of Left Membrane and Right Membrane. 3. Inspection of heat treatment. 4. Verification of roundness. The progress of the performance test of the bellows samples that have been produced in the above processre ; After fabrication a bellows performance test jig, leak test, moment test, life cycle test and thermal environment life cycle test was conducted.

우리나라 동향결혼의 변화추세와 결정요인

조동혁(Donghyuk Jo),박선권(Sunkwon Park),성낙일(Nakil Sung) 한국인구학회 2011 한국인구학 Vol.34 No.3

우리나라에서 ‘동향’은 배우자의 선택에서 주요 요인의 하나이다. 본 연구는 1993년~2009년 기간의 통계청 혼인통계자료를 시용해 우리나라 동향결혼의 변동추세와 현황을 분석하고 이를 토대로 동향결혼 선택확률에 영향을 미친 각종 요인을 고찰하는 데에 목적이 있다. 본 연구의 분석결과에 따르면, 우리나라에서 동향결혼은 여전히 큰 부분을 차지하고 있지만 시간이 지나면서 점차 줄어들고 있다. 또한 동향결혼은 해당 지역에서의 인구이동 및 구성에 의해서도 영향을 받았다. 특히 수도권으로의 인구유입은 타향출신의 결혼 후보자를 접할 기회를 증가시켜 동향결혼비율의 감소를 가져왔다. 또한 자신과 비교해 결혼 상대자의 소득이 더 커질수록 동향결혼을 선택할 가능성은 감소했다. 이는 배우자의 선택에서 동향요인이 약화되고 있는 데에는 경제적 요인도 작동하고 있었음을 의미한다. 본 연구는 방대한 원시자료에 기초해 우리나라의 동향결혼 현상을 실증적 관점에서 규명한 최초의 연구라는 점에서 의의가 있다. This study examines marriage between spouses from the same native place, suggests some stylized facts regarding the marriage type, and attempts to assess demographic, regional and economic factors which affect the probability of marriage between spouses from the same native place. Empirical analysis is carried out with original microdata on marriage over the period 1993-2009. Empirical results indicate that the birthplace of spouse played a less and less important role in marriage-related decision over time. Second, in addition to differences in a propensity to choose a person from the same native place as a spouse across regions, mobility and composition in population affected the probability of marriage between spouses from the same native place. For example, an influx of people into the capital region accelerated the chance of face-to-face communication between persons from the different birthplace, thereby decreasing the probability of marriage between spouses from the same native place. Finally, wider income gap between husband and wife led to lower probability of marriage between spouses from the same native place. To the best of our knowledge, this study is one of the first empirical analysis to investigate into the relationship between marriage and birthplace.

Coordination-Driven Self-Assembly Using Ditopic Pyridyl–Pyrazolyl Donor and <i>p</i>-Cymene Ru(II) Acceptors: [2]Catenane Synthesis and Anticancer Activities

Jo, Jae-Ho,Singh, Nem,Kim, Donghyuk,Cho, Se Min,Mishra, Anurag,Kim, Hyunuk,Kang, Se Chan,Chi, Ki-Whan American Chemical Society 2017 Inorganic Chemistry Vol.56 No.14

<P>Coordination-driven self-assembly of m-bis[3-(4-pyridyl)pyrazolyl]xylene (L) and [(p-cymene)(2)Ru-2-(OO boolean AND OO)(2)(OTf)(2)] (A(1)) (OO boolean AND OO = 6,11-dioxido-5,12-naphthacenedione) in methanol resulted in a mixture of [2]catenane 1 and macrocyde 2, and self-assembly in nitromethane resulted in pure macrocycle 2, whereas the coordination-driven self-assembly of L and similar acceptors [(p-cymene)(2)Ru-2(OO boolean AND OO)(2)(OTf)(2)] [OO boolean AND OO = 5,8-dioxido-1,4-naphthoquinonnato (A(2)); 2,5-dioxido-1,4-benzoquinonato (A(3)); oxalato (A(4))] resulted in the formations of monomeric macrocydes 3-5, respectively. All self-assembled macrocydes were obtained in excellent yields (>90%) as triflate salts and were fully characterized by multinuclear NMR, elemental analysis, and electrospray ionization mass spectrometry (ESI-MS). The structures of [2]catenane 1 and macrocydes 5 were confirmed by single-crystal X-ray diffraction analysis. The X-ray structure of 1 confirmed an edge-to-face interaction between the tetracene moiety in parallel-displaced pi-pi stacks (3.5 angstrom), and CH center dot center dot center dot pi (2.5 angstrom) stabilizes the [2]catenane topology. Macrocydes 2-5 were assessed for anticancer activities using human cancer cell lines of different origins, and the macrocyde 3 was found to exhibit the best inhibitory effect and to do so in a dose-dependent manner. Further examination with the Tali apoptosis assay suggested the growth inhibitory effect of 3 involved the induction of the programmed cell death, and this suggestion was supported by observations of PARP and caspase 3 cleavage after treating cells with 3. In addition, exposure to 3 increased the expression of Bax and repressed the expression of Bcl-2, thus indicating the involvement of macrocyde 3 upstream of Bax and Bcl-2 in the apoptotic signaling pathway. Macrocycle 3 also tended to repress metastasis as evidenced by changes in the transcriptional expressions E- and N-cadherin (markers of metastasis). Furthermore, a stability assay demonstrated macrocyde 3 remained stable at high concentration.</P>

MPI-CDL 망의 전송 효율 증대를 위한 패킷 헤더 압축 프로토콜 연구

한동혁(Donghyuk Han),신성진(Sungjin Shin),조성웅(Sung-Woong Jo),하태영(Taeyoung Ha),박의영(Ui-young Pak),류영재(Young-jae Ryu),정종문(Jong-Moon Chung) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.6

K-medians 클러스터링과 Elbow method를 이용하여 정확도가 향상된 Snort rule classifier

김동혁(Donghyuk Kim),조호성(Hosung Jo),박희진(Heejin Park) 한국정보과학회 2015 한국정보과학회 학술발표논문집 Vol.2015 No.12

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.

Reasons for Divorcing and Their Relationships with Divorcees' Demographic and Socioeconomic Status: The Case of Korea

Nakil Sung,Donghyuk Jo 한국재정학회 2015 한국재정학회 학술대회 논문집 Vol.2015 No.3

BACKGROUND Divorce data from Korea provide a unique opportunity for divorce research. Korea’s divorce declaration record includes detailed information on reasons for divorcing as well as on divorcees' demographic and socioeconomic status such as age at marriage, occupations, and the education level. OBJECTIVE Using divorce data from Korea, this study examines the characteristics of divorcees classified by reasons for divorcing and provides a multinomial logit analysis to assess the relationships between divorcees' demographic and socioeconomic status and their reasons for divorcing. RESULTS The demographic and socioeconomic status of divorcees was closely related to reasons for divorcing. For example, unemployed husbands were more likely to get divorced for economic problems than for any other reason. By contrast, couples with skilled jobs were more likely to get divorced for personal differences than for economic problems.

숙박예약서비스 환경에서 e-서비스스케이프가 고객충성도에 미치는 영향 : 한·중 비교를 중심으로

사사(SHASHA),조동혁(Jo, Donghyuk) 글로벌경영학회 2021 글로벌경영학회지 Vol.18 No.2

온라인 쇼핑 시장의 급속한 성장과 함께 소비자의 소비 행동은 오프라인 중심에서 온라인으로 변화하고 있다. 온라인 환경에서 판매자와 구매자의 관계는 점차 사라지고 있으며, 소비자 행동에 영향을 미치는 요인으로서 온라인 웹 사이트의 환경을 이해하는 것은 인터넷 쇼핑에서 있어 매우 중요한 요소로 인식되고 있다. 따라서 본 연구는 온라인 쇼핑환경을 e-서비스스케이프의 개념으로 제시하고, 고객 만족, 신뢰 및 충성도에 영향을 파악하고자 한다. 이를 위해 본 연구에서는 기존의 연구에서 검토되지 못한 확장된 상호작용성, 정보성, 오락성의 개념을 e-서비스스케이프의 하위차원으로 추가하여 그 역할을 검증하였다. 연구결과, 숙박예약서비스 환경에서 e-서비스스케이프와 고객만족, 고객신뢰 및 고객충성도 간의 유의한 영향관계가 있음을 확인하였다. 본 연구는 e-서비스스케이프의 연구 분야를 숙박예약서비스 분야로 확대하여 e-서비스스케이프와 소비자 행동 간의 관계를 실증적으로 검증하였다는 데 의의가 있다. With the rapid growth of the online shopping market, consumers consumption behavioris moving from offline center to online. In the online environment, the relationship between sellers and buyers is gradually disappearing, and understanding the environment of online web sites as a factor that influences consumer behavior isa very important factor in Internet shopping. Through the servicescape, This study will understand the factors that affect loyalty, focusing on Korea-China comparison. In this study, the concepts of extended interactivity, information, and entertainment that were not reviewed in previous studies were added and introduced into the research model to verify their role. It is meaningful in that a detailed study was conducted by expanding the e-servicescape and accommodation reservation service to conduct a comprehensive study, and in that it studies the relationship between e-servicescape and customer satisfaction, customer reliability, and customer loyalty.

빔 수의칭 안테나를 이용한 MIMO 수신기 설계

조권도(Gweon-Do Jo),곽동혁(Donghyuk Gwak),오정훈(Jung-Hoon Oh) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6