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김한별(Hanbyeol Kim),최해천(Haecheon Choi) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In submarine crude oil industries, the crude oil fouling in a pipe causes critical problems such as narrowing the pipe diameter and the pressure drop. Thus, the prediction and mitigation of crude oil fouling is an important issue to investigate. In the present study, we conduct direct numerical simulation (DNS) of the crude oil fouling in a turbulent channel flow using additional species transport equations as a phase separation model. We treat the fouling deposits as a highly viscous fluid, and assume that the fluid flows as a slurry flow and the apparent viscosity is calculated using Thomas’ equation. Also, we assume that a second order chemical reaction occurs between asphaltene and coke which are a reactant and a product, respectively. In our simulation, the asphaltene flows into the channel at the inlet and reacts on the hightemperature walls, and then the coke is stuck on the wall by its high viscosity.
김한별(Hanbyeol Kim),김형신(Hyungsin Kim) 한국소비문화학회 2023 소비문화연구 Vol.26 No.1
최근 공급자 중심에서 수요자 중심으로 정책 개발 패러다임이 변화함에 따라, 정책 디자인에 공공서비스 디자인 방법론이 활발히 활용되고 있다. 공공서비스 디자인 방법을 이용하여 정책을 디자인 할 때 가장 큰 특징 중 하나는, 수요자와 공급자가 코크리에이션(co-creation) 워크숍을 통해 정책 의제의 발굴부터 정책 아이디어 도출까지 함께 진행한다는 것이다. 하지만, 정책디자인 워크숍의 대부분은 오프라인으로 진행되기 때문에, 참여자의 물리적, 시간적 진입 장벽으로 참여자가 한정된다는 문제점이 발생한다. 이러한 문제는, 다양한 정책 수요자의 의견이 반영되기 어려워 편향된 의견에 따른 정책이 만들어 질 수 있다. 본 연구는 이 문제점을 해결하고자, 온라인 환경에서 정책디자인 워크샵을 진행할 수 있는 툴 ‘폴디(PolD)’를 개발 하였다. 연구 방법으로는 이해관계자 심층 인터뷰 및 어피니티 다이어그램을 통해 정책디자인 프레임워크 설계 및 온라인 정책디자인 툴의 필수기능을 정의하여 이를 프로토타이핑 한 후 사용자 평가를 진행하였다. 실험 결과, 폴디와 같은 온라인 정책디자인 툴은 정책수요자인 일반 시민의 정책 참여에 시공간적 진입 장벽을 낮추어, 정책 디자인 워크숍에 더 많은 사람들이 참여할 수 있게 할 뿐만 아니라, 정책실무자 및 퍼실리테이터가 효율적인 정책디자인 워크숍을 진행하는데 도움이 되는 것을 보여주었다. As the paradigm of policy development has recently changed from a provider-centered policy perspective to a consumer-centered one, public service design methodology is actively used in policy design. Such design in the area of public service proceeds from discovering policy agendas to deriving policy ideas through co-creation workshops between consumers and suppliers. However, policy design workshops were conducted offline in the majority of cases, which results in difficulties in terms of reflecting the opinions of various policy consumers, as the pool of participants is limited due to the presence of physical and entry barriers. Accordingly, this study proceeded with the development of a policy design workshop tool in an online environment. Through in-depth interviews with stakeholders and affinity diagrams, essential functions of policy design framework design and online policy design tools were defined and prototyped. the final online policy design tool ‘PolD’ was developed through three prototyping tests. The results of this analysis shows that the PolD will overcome the temporal and spatial barriers of participation in policy design workshops. The practical significance of this study is crucial as it enables the creation efficient policy design workshops in the case of policy practitioners and facilitators.
부유식 해상 구조물의 진단을 위한 유탄성 해석 프로그램 적용
김한별 ( Kim¸ Hanbyeol ),반석현 ( Ban¸ James ),마천 ( Ma¸ Chuan ),정석원 ( Jeong¸ Seokwon ),지광습 ( Zi¸ Goang-seup ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
본 연구는 부유식 해상 구조물의 진단을 위해 유탄성 해석 프로그램을 적용하기 위함이다. 연구결과에 의하면, 해당 해석 프로그램은 부유식 해상 구조물의 거동과 역학 관계를 도출해내어 구조물의 진단에 도움이 됨을 확인하였다.
L2-영어 수준별 L1-한국어 고등학생들의 L2 관사습득과 사용양상
김한별 ( Kim Hanbyeol ),백승현 ( Baek Seunghyun ) 한국외국어대학교 외국어교육연구소 2022 외국어교육연구 Vol.36 No.4
This study explored the choice of definite article the and indefinite article a(n) of fifty-six adolescent L1-Korean L2-English learners in the four semantic contexts: [+definite, +specific], [+definite, -specific], [-definite, +specific], and [-definite, -specific] and a writing test depending on their L2 grammatical ability. The results revealed that regardless of their L2 grammatical ability, in the forced-choice test, overall, they overuse the in the indefinite context and a(n) in the definite context. In particular, they are unlikely to properly use a(n) in the [-definite, +specific] context and most likely to fluctuate between [-definite, +specific] and [-definite, -specific]. Additionally, in the writing test, it was found that they use a(n) more accurately than the in noun phrases (NPs) and tend to dominantly omit the articles, a(n) and the prior to NPs. These results propose that adolescent L1-Korean L2-English learners may have more difficulties in acquiring [±specificity] than [±definiteness] and they seem to acquire the indefinite article, a(n) earlier than the definite one, the, mapping [-definiteness] onto one, the numeric number on singular nouns. The possible linguistic reasons for their L2-English article choice and acquisition order along with their textbook analysis and pedagogical implications were further discussed in detail.
박준기(Jungi Park),조철현(Cheulhyun Cho),김한별(Hanbyeol Kim),이정우(Jungwoo Lee) 한국IT서비스학회 2013 한국IT서비스학회지 Vol.12 No.3
IT consulting is becoming a norm rather than exception in this age of smart work and information revolution. As IT consulting is one of the knowledge intensive services requiring high credence on both sides, maintaining a good trustful relationship is critical in sustenance of strategic partnership between business firms and IT service firms. Trust is known to be one of the salient constructs in service relationships. In this study, building from the social psychology literature, trust is conceptualized as two dimensions : cognitive and affective trust. Using two dimensions of trust as mediators, a research model is constructed for IT consulting specific context : relationship continuance intention as the dependent construct while expertise, service performance, reputation, relationship satisfaction and value similarity as antecedents of cognitive and affective trust. 145 data points were collected through a survey of IT service client project managers retrospectively asking their experience with IT consultants. Findings suggest that cognitive trust is associated with perceived level of expertise and service performance while affective trust with relationship satisfaction and value similarity, respectively. Interestingly, the paths from reputation are found to be statistically insignificant towards both dimensions of trust, indicating IT service context would be more practically outcome oriented than any other professional service context. Also, cognitive trust seems to maintain stronger influence on relationship continuance intention as anticipated. Implications and limitations are discussed at the end.