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충돌분무의 액적 거동에 미치는 비등방성 난류특성의 영향에 대한 수치해석 연구
고권현(G. H. Ko),유홍선(H. S. Ryou) 한국전산유체공학회 2003 한국전산유체공학회지 Vol.8 No.4
It is an aim of this study to perform extensive numerical study for analyzing the anisotropic turbulence effects on spatial and temporal behaviors of droplet for impinging sprays. The turbulence model of Durbin is used for comparisons with the k-E model. The turbulence-induced dispersions of droplets are consider to describe the anisotropy of turbulence effectively and spray/wall interactions are simulated using the model of Lee and Ryou. Present study investigates the overall and the internal structures of impinging diesel sprays such as spray shapes, radius and height of wall sprays, Sauter mean diameter (SMD), local droplet velocity, and local gas velocity and compared the results with experimental data by two adopted turbulence models. When the anisotropy effect of turbulence is included, better predictions for both gas and droplet tangential velocities are obtained, compared to the k-ε model. It is concluded that anisotropic effect of turbulence should be considered for simulating impinging diesel sprays.
Host People's Kindness and Migrant Workers' Cultural Adaptation: Evidence from South Korea
Jihyun Ryou(Jihyun Ryou),Sang-Yeon Kim(Sang-Yeon Kim) 한국학술연구원 2022 Korea Observer Vol.53 No.4
This study purports to determine the predictors of migrant workers' cultural adaptation in South Korea. In the main, we examined the extent to which the level of inter-/intracultural socializing, exposure to local/native media, and host culture receptivity affect the level of cultural adaptation in cognitive, affective, behavioral domains. Potential impacts of demographic factors (e.g., age, sex, ethnicity, marital status, living alone vs. with family, education level, residency in years, perceived cultural similarity) were also explored. To find answers to the research questions, a total of 634 migrant workers from 37 different nations were reached using a snowball sampling. Surveys were collected in 12 districts of Seoul, the capital of South Korea, and 21 adjacent metropolitan areas. Results indicate that intercultural interaction with host people and media exposure to local contents tend to help improve their knowledge about South Korea (e.g., language, culture). With all else equal, migrant workers treated kindly by Koreans at the workplace and in service sectors, and those living with family, compared to those who live alone, tended to enjoy a greater satisfaction with work and life in South Korea and were more willing to stay. Practical implications for Korean policymakers include encouraging competent migrant workers to move together with the family, making administrative efforts to further simplify the documentation process, and initiating public campaigns to raise host culture receptivity among Korean citizens.
Ryou, Hong-Sun,Lee, Seong-Hyuk,Ko, Gwon-Hyun,Hong, Ki-Bae The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.7
The present article presents an extension to the computational model for spray/wall interaction and liquid film processes that has been dealt with in the earlier studies (Lee and Ryou, 2000a). The extensions incorporate film spread due to impingement forces and dynamic motion induced by film inertia to predict the dynamic characteristics of wall films effectively. The film model includes the impingement pressure of droplets, tangential momentum transfer due to the impinging droplets on the film surface and the gas shear force at the film surface. Validation of the spray/wall interaction model and the film model was carried out for non-evaporative diesel sprays against several sources of experimental data. The computational model for spray/wall interactions was in good agreement with experimental data for both spray radius and height. The film model in the present work was better than the previous static film model, indicating that the dynamic effects of film motion should be considered for wall films. On the overall the present film model was acceptable for predication of the film radius and thickness.
The Importance of Word-for-Word Translation Or How to Minimize What Is Lost in Poetic Translating
Ryou, KyongJoo H. 한국비교문학회 2003 比較文學 Vol.30 No.-
번역된 시 본문이 지닌 과도한 상화화는, 특별히 이 상황화가 외견상의 본문의 매끄러움을 위해서 원래의 의미 그 이상으로 나아갈 경우 위험성이 있다. 문학작품을 번역하는데 늘 따라오는 어려움이 시 번역에서는 더욱 심해지는데 이는 문학작품을 다른 종루의 글과 구별케 하는 속성들이 시에서는 더욱 강하게 드러나기 때문이다. 게다가 시가 지닌 특별한 요소들, 즉 소리, 리듬, 운율 그리고 세쥬라(caesura) 같은 것들은 번역자에게 엄청난 부담을 주게된다. 이런 상황에서, 과도한 수정이나 첨가와 같은 시도를 멈추게 하는 힘은 기본적으로 본문 그 자체이다. 비록 몇몇 학자들은 축어적인 번역을 조소 어린 시선으로 바라보지만, 원본이 지닌 미묘한 암시들과 시사하는 바들을 가능한 한 손상시키지 않으면서도 원래의 의미에 충실한 시 번역본을 만드는 일은 번역이 매끄럽든 아니든 먼저 문자적 번역의 원리들에 기초해야 한다. 시 본문을 갖고 있는 모든 면들, 즉 단어는 단어대로, 운율은 운율대로, 은유는 은유대로 모든 차원들을 면밀하게 검토하고 살핀 후에야 비로소, 번역자는 최소한 원본이 지닌 본질의 얼마를 번역본 가운데 살려낼 수 있기를 소망할 수 있는 것이다. 위에서 본 소고가 주장하는 바는 다음과 같은 두 가지의 사례를 중심으로 개진될 것인데, 그 중 하나는 미국에서 출판될 릴케의 번역물에 대한 수용이요, 다른 하나의 가장 자주 번역되어지고 또한 가장 자주 시선집에 소개되는 김소월의 「진달래 꽃」이다.
Numerical Evaluation of Crashworthiness of Automotive Sheets
Ryou, Han Sun,Lee, Myoung Gyu,Kim, Chong Min,Chung, Kwan Soo Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.345-346 No.-
<P>Crash simulations were performed for automotive sheets. To understand the influence of crystal structures in sheet materials on crashworthiness, the effect of the yield function shape was studied by adopting the recently developed non-quadratic anisotropic yield surface, Yld2004-18p. The effect of the back-stress was also investigated by comparing simulation results obtained for the isotropic, kinematic and combined isotropic-kinematic hardening laws based on the modified Chaboche model. In addition, the effects of anisotropy and sheet thickness on crashworthiness were evaluated.</P>
Properties of early-stage concrete with setting-accelerating tablet in cold weather
Ryou, J.S.,Lee, Y.S. Elsevier Sequoia 2012 Materials science & engineering. properties, micro Vol.532 No.-
Various methods are used at the early stages to control setting-time and strength of concrete, when cold-weather concrete is utilized. Among these methods is one that involves the use of an accelerator. Although economical, accelerators have difficulty securing workability because their early hydration makes them react rapidly. Therefore, how to make a tablet for cold-weather concrete, as with the existing medicines and foods, is discussed in this study, including the following items: mortar setting-time, workability by elapsed time, early strength to assure the development of adequate strength, and freezing-thawing resistance. As a result, both the 0.5 and 1.0% tablets were found to be superior. Thus, workability can be secured, as well as the development of early strength to prevent early frost.
Ryou, S.M.,Park, M.,Kim, J.M.,Jeon, C.O.,Yun, C.H.,Han, S.H.,Kim, S.W.,Lee, Y.,Kim, S.,Han, M.S.,Bae, J.,Lee, K. Elsevier Science Publishers 2011 Journal of biotechnology Vol.156 No.2
A prerequisite for the therapeutic use of small RNAs is the development of a method that can deliver them into animals. Previous studies have shown the capability of functionalized gold nanoparticles to serve as a general platform for loading and delivering DNA oligonucleotides and short hairpin RNAs (shRNAs) into cultured human cells. Here, we report the ability of the gold nanoparticle-assisted gene delivery system (AuNP-GDS) to deliver shRNA to a xenograft tumor in a mouse model. AuNP-GDS delivery of in vitro synthesized shRNA targeted to the Mcl-1L gene knocked down levels of Mcl-1L mRNA and protein by ∼36% and ∼26%, respectively, which were sufficient to induce apoptosis of the xenograft tumor cells and consequently inhibited the development of the tumor. We demonstrated that our lego-like AuNP-GDS, which can easily load and deliver shRNAs targeted to any gene of interest into living systems, can deliver shRNAs into xenograft tumors, leading to antitumor activity in an animal model.