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( Ryan Kihoon Kang ) 서울대학교 아시아태평양법연구소 2013 Journal of Korean Law Vol.12 No.2
The purpose of the article is to determine the territorial sovereignty status of the Liancourt Rocks, disputed between Korea and Japan. The islands are currently occupied and controlled by Korea, and Japan protests the Korean occupation as illegal. The paper employs the historical analysis of the state and civilian actions involving the Liancourt Rocks. The relevant actions are examined under the international legal principles of sovereignty acquisition founded by international mediators, arbitrators, the Permanent Court of International Justice, and the International Court of Justice throughout history. The paper finds that Korea has acquired an earlier title than Japan and has maintained the valid and legal sovereignty over the Liancourt Rocks through the operation of various principles under public international law. Thus the current occupation of the Liancourt Rocks by Korea is found to be legal and valid.
Ryan Kihoon Kang 서울대학교 아시아태평양법연구소 2013 Journal of Korean Law Vol.12 No.2
The purpose of the article is to determine the territorial sovereignty status of the Liancourt Rocks, disputed between Korea and Japan. The islands are currently occupied and controlled by Korea, and Japan protests the Korean occupation as illegal. The paper employs the historical analysis of the state and civilian actions involving the Liancourt Rocks. The relevant actions are examined under the international legal principles of sovereignty acquisition founded by international mediators, arbitrators, the Permanent Court of International Justice, and the International Court of Justice throughout history. The paper finds that Korea has acquired an earlier title than Japan and has maintained the valid and legal sovereignty over the Liancourt Rocks through the operation of various principles under public international law. Thus the current occupation of the Liancourt Rocks by Korea is found to be legal and valid.
Hall, Ryan,Kang, Beom-Goo,Lee, Sanghoon,Chang, Taihyun,Venerus, David C.,Hadjichristidis, Nikos,Mays, Jimmy,Larson, Ronald G. American Chemical Society 2019 Macromolecules Vol.52 No.4
<P>We determine experimentally the “dilution exponent” α for entangled polymers from the scaling of terminal crossover frequency with entanglement density from the linear rheology of three 1,4-polybutadiene star polymers that are blended with low-molecular-weight, unentangled linear 1,4-polybutadiene at various star volume fractions, ϕ<SUB><I>s</I></SUB>. Assuming that the rheology of monodisperse stars depends solely on the plateau modulus <I>G</I><SUB><I>N</I></SUB>(ϕ<SUB>s</SUB>) ∝ ϕ<SUB><I>s</I></SUB><SUP>1+α</SUP>, the number of entanglements per chain <I>M</I><SUB><I>e</I></SUB>(ϕ<SUB><I>s</I></SUB>) ∝ ϕ<SUB><I>s</I></SUB><SUP>-α</SUP>, and the tube-segment frictional Rouse time τ<SUB><I>e</I></SUB>(ϕ<SUB><I>s</I></SUB>) ∝ ϕ<SUB><I>s</I></SUB><SUP>-2α</SUP>, we show that only an α = 1 scaling superposes the <I>M</I><SUB><I>e</I></SUB>(ϕ<SUB><I>s</I></SUB>) dependence of the terminal crossover frequency ω<SUB><I>x</I>,<I>t</I></SUB> of the blends with those of pure stars, not α = 4/3. This is the first determination of α for star polymers that does not rely on any particular tube model implementation. We also show that a generalized tube model, the “Hierarchical model”, using the “Das” parameter set with α = 1 reasonably predicts the rheological data of the melts and blends featured in this paper.</P> [FIG OMISSION]</BR>
Ku, Kang Hee,Shin, Jae Man,Klinger, Daniel,Jang, Se Gyu,Hayward, Ryan C.,Hawker, Craig J.,Kim, Bumjoon J. American Chemical Society 2016 ACS NANO Vol.10 No.5
<P>A series of porous block copolymer (BCP) particles with controllable morphology and pore sizes was fabricated by tuning the interfacial behavior of BCP droplets in oil-in-water emulsions. A synergistic adsorption of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) BCPs and sodium dodecyl sulfate (SDS) to the surface of the emulsion droplet induced a dramatic decrease in the interfacial tension and generated interfacial instability at the particle surface. In particular, the SDS concentration and the P4VP volume fraction of PS-b-P4VP were key parameters in determining the degree of interfacial instability, leading to different types of particles including micelles, capsules, closed-porosity particles, and open-porosity particles with tunable pore sizes ranging from 10 to 500 nm. The particles with open-porosity could be used as pH responsive, high capacity delivery systems where the uptake and release of multiple dyes could be achieved.</P>
Hall, Ryan,Desai, Priyanka S.,Kang, Beom-Goo,Huang, Qifan,Lee, Sanghoon,Chang, Taihyun,Venerus, David C.,Mays, Jimmy,Ntetsikas, Konstantinos,Polymeropoulos, George,Hadjichristidis, Nikos,Larson, Ronal American Chemical Society 2019 Macromolecules Vol.52 No.20
<P>We blend newly synthesized nearly monodisperse four-arm star 1,4-polybutadienes with various well-entangled linear polymers, confirming the conclusions in Desai et al. [<I>Macromolecules</I>201649 (13)49644977] that advanced tube models, namely, the hierarchical 3.0 and branch-on-branch models [Wang, Z.; <I>J. Rheol.</I>201054 (2)223260], fail to predict the linear rheological data when the pure linear polymers have shorter relaxation times, but within 3-4 orders of magnitude of the star polymer. However, when the linear polymer has a longer relaxation time than the star, our new work, surprisingly, finds that non-monotonic dependence of terminal relaxation behavior on composition is both observed experimentally and captured by the models. Combined with previous data from the literature, we present results from over 50 1,4-polybutadiene star-linear blends, suitable for thorough testing of rheological models of entangled polymers.</P> [FIG OMISSION]</BR>
Statistical calibration of safety factors for flexural stiffness of composite columns
Farhad Aslani,Ryan Lloyd,Brian Uy,Won-Hee Kang,Stephen Hicks 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.1
Composite column design is strongly influenced by the computation of the critical buckling load, which is very sensitive to the effective flexural stiffness (EI) of the column. Because of this, the behaviour of a composite column under lateral loading and its response to deflection is largely determined by the EI of the member. Thus, prediction models used for composite member design should accurately mirror this behaviour. However, EI varies due to several design parameters, and the implementation of high-strength materials, which are not considered by the current composite design codes of practice. The reliability of the design methods from six codes of practice (i.e., AS 5100, AS/NZS 2327, Eurocode 4, AISC 2010, ACI 318, and AIJ) for composite columns is studied in this paper. Also, the reliability of these codes of practice against a serviceability limit state criterion are estimated based on the combined use of the test-based statistical procedure proposed by Johnson and Huang (1997) and Monte Carlo simulations. The composite columns database includes 100 tests of circular concrete-filled tubes, rectangular concrete-filled tubes, and concrete-encased steel composite columns. A summary of the reliability analysis procedure and the evaluated reliability indices are provided. The reasons for the reliability analysis results are discussed to provide useful insight and supporting information for a possible revision of available codes of practice.
Lee, Yeonjae,Kang, Ryan,Kwon, Jenna,Jo, Kyuhee,Im, Jungbin,Jung, Sangwook,Lee, DongHyun,Lee, Juhyeon,Lee, Jeong-Sang The Institute of Internet 2018 International journal of advanced smart convergenc Vol.7 No.2
Celiac disease (CD) is an immune-mediated enteropathy of small intestine diagnosed in both childhood and adulthood. CD is caused by gluten, which produces gliadorphin during its digestion. The enzyme dipeptidyl peptidase-4 (DPP4) breaks gliadorphin down nevertheless the last tripeptide remains and eventually inhibits DPP4, thus slowing down its process. Therefore, the idea is to produce an additional DPP4 enzyme which is crucial. Consequently, the functional DPP4 gene was cloned into pCDNA3 intermediate (FLAG+DPP4) vector and finally a recombinant plasmid pSB1C3 (Andersons promoters+FLAG+DPP4) was constructed using synthetic biology. Normally, a DPP4 inhibitor is used as a cure for diabetes. Another important concern was overexpression of DPP4, which might lead to diabetes, accordingly the work was also performed for the regulation of the DPP4 gene expression. In this regard, three types of Anderson promoters (strong, moderate and weak) were utilized to study the control overexpression. This is the first report of idealistic trial for control the exogenous DPP4 gene-expression by molecular biologic tools.