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Dongwoo Ham,YoungYun Cho,Mi-Suk Park,Yun-Sug Park,Sun-Young Kim,Hye-Min Seol,Yoo Mi Park,Sunok Woo,Hyojee Joung,Do-Sun Lim 한국영양학회 2020 Nutrition Research and Practice Vol.14 No.6
BACKGROUND/OBJECTIVES: The Seoul Metabolic Syndrome Management (SMESY) program is a 1-yr lifestyle modification program targeting metabolic syndrome (MetS) in Seoul residents. This study investigated the associations between adherence to dietary guidelines and MetS among the SMESY program participants. SUBJECTS/METHODS: Data of 54,385 participants aged 20-64 yrs who completed the SMESY program in 2015, had information on adherence to dietary guidelines, and were not medicated for diabetes, hypertension, or dyslipidemia were analyzed. Participants underwent MetS screening and completed a lifestyle questionnaire including adherence to 10 dietary guidelines before and after participation. Participants were classified according to the number of MetS risk factors at baseline (MetS group, ≥ 3; risk group, 1-2; healthy group, none). Adherence to dietary guidelines was determined from the number of “yes” responses regarding the fulfillment of each guideline on ≥ 5 days/week. Multiple logistic regression was used to evaluate associations between newly diagnosed MetS and changes in adherence to dietary guidelines. RESULTS: In the MetS group, MetS prevalence decreased after the SMESY program (men, -41.9%p; women, -48.7%p), and all risk factors were significantly improved (P < 0.0001). All groups exhibited improved adherence to all dietary guidelines after participation (P < 0.0001). In the MetS group with positively changed adherence scores, the MetS prevalence decreased by -44.1%p for men and -49.5%p for women, whereas the prevalence in those with negative changes decreased by -38.1%p for men and -48.6%p for women. In the risk group, those with positively changed adherence scores had significantly decreased odds ratios (ORs) for newly diagnosed MetS compared with those with negative changes (OR, 0.70; 95% confidence interval [CI], 0.61-0.80 for men; OR, 0.88; 95% CI, 0.79-0.99 for women). CONCLUSIONS: The SMESY program may effectively reduce the risk of MetS among adults with risk factors by improving adherence to dietary guidelines.
Lim, Junyub,Song, Kang Sub,Kim, Dongwoo,Lee, DongChan,Kim, Yongchan Elsevier 2018 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.127 No.1
<P><B>Abstract</B></P> <P>In this study, the condensation heat transfer characteristics of R245fa in a shell and plate heat exchanger (SPHE) are measured and analyzed by varying the mean vapor quality from 0.16 to 0.86, mass flux from 16.0 to 45.0 kg m<SUP>−2</SUP> s<SUP>−1</SUP>, heat flux from 1.3 to 9.0 kW m<SUP>−2</SUP>, and saturation temperature from 90 to 120 °C for high-temperature heat pumps (HTHPs). The condensation heat transfer coefficient and frictional pressure drop are shown to increase with increasing mean vapor quality and mass flux and with decreasing saturation temperature. The condensation heat transfer coefficient of R245fa in SPHE is on average 5.9% lower than that in the brazed plate heat exchanger (BPHE) with a similar effective heat transfer area. However, the average two-phase frictional pressure drop of R245fa in SPHE is 16.7% lower than that in BPHE. Empirical correlations for the condensation heat transfer coefficient and two-phase frictional pressure drop in SPHE are developed with mean absolute errors of 8.2% and 9.4%, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The condensation heat transfer characteristics of R245fa in SPHE and BPHE are measured and analyzed. </LI> <LI> The heat transfer coefficients of R245fa in SPHE are lower than those in BPHE. </LI> <LI> BPHE shows higher pressure drops of R245fa than SPHE at the same heat flux. </LI> <LI> Correlations of Nusselt number and friction factor of R245fa in SPHE are developed. </LI> </UL> </P>
Biology and Potential Use of Chicken Bone Marrow-derived Cells
Dongwoo Ko,Jeong Mook Lim 한국수정란이식학회 2018 한국동물생명공학회지 Vol.33 No.1
Developmental aspects of chicken embryos showed dramatic difference compared with those of mammals and consequently, such difference in various developmental events leads to different feasibility in both clinical and industrial application. We have concentrated on the studies for using of chicken bone marrow cells and currently we found number of unique cellular properties. Through this article, we reviewed characteristics and cell signaling of osteogenic cells during endochondral ossification in chicken long bone.
Variable-node element families for mesh connection and adaptive mesh computation
Lim, Jae Hyuk,Sohn, Dongwoo,Im, Seyoung Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.3
Variable-node finite element families, termed (4 + k + l + m + n)-node elements with an arbitrary number of nodes (k, l, m, and n) on each of their edges, are developed based on the generic point interpolation with special bases having slope discontinuities in two-dimensional domains. They retain the linear interpolation between any two neighboring nodes, and passes the standard patch test when subdomain-wise $2{\times}2$ Gauss integration is employed. Their shape functions are automatically generated on the master domain of elements although a certain number of nodes are inserted on their edges. The elements can provide a flexibility to resolve nonmatching mesh problems like mesh connection and adaptive mesh refinement. In the case of adaptive mesh refinement problem, so-called "1-irregular node rule" working as a constraint in performing mesh adaptation is relaxed by adopting the variable-node elements. Through several examples, we show the performance of the variable-node finite elements in terms of accuracy and efficiency.
Nonconforming Finite Element Method Applied to the Driven Cavity Problem
Lim, Roktaek,Sheen, Dongwoo Global Science Press 2017 Communications in computational physics Vol.21 No.4
<B>Abstract</B><P>A cheapest stable nonconforming finite element method is presented for solving the incompressible flow in a square cavity without smoothing the corner singularities. The stable cheapest nonconforming finite element pair based on <I>P</I>1×<I>P</I>0 on rectangularmeshes [29] is employed with a minimal modification of the discontinuous Dirichlet data on the top boundary, where is the finite element space of piecewise constant pressures with the globally one-dimensional checker-board pattern subspace eliminated. The proposed Stokes elements have the least number of degrees of freedom compared to those of known stable Stokes elements. Three accuracy indications for our elements are analyzed and numerically verified. Also, various numerous computational results obtained by using our proposed element show excellent accuracy.</P>
Kim, Dongwoo,Kim, Eunju,Lee, Jiyeong,Hong, Soonsang,Sung, Wokyung,Lim, Namseok,Park, Chan Gyung,Kim, Kimoon American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.28
<P>A detailed study of the direct synthesis of polymer nanocapsules, which does not require any template, and core removal, is presented. Thiol−ene “click” reaction between a CB[6] derivative (<B>1</B>) with 12 allyloxy groups at the periphery and dithiols directly produced polymer nanocapsules with a highly stable structure and relatively narrow size distribution. Based on a number of observations including the intermediates detected by DLS, TEM, and SEM studies, a mechanism of the nanocapsule formation was proposed, which includes 2D oligomeric patches turning into a hollow sphere. A theoretical study supports that the formation of a hollow sphere from a disk-shaped intermediate can be thermodynamically favorable under certain conditions. In particular, the effects of various factors such as monomer concentration, reaction temperature, and medium on the formation of polymer nanocapsules have been investigated, which qualitatively agree with those predicted by our theoretical model. An interesting feature of the polymer nanocapsules was that the polymer shell made of a CB[6] derivative allows facile tailoring of its surface properties in a noncovalent and modular manner by virtue of the unique recognition properties of the accessible molecular cavities exposed on the surface. Furthermore, this approach appears to be applicable to any building unit with a flat core and multiple polymerizable groups at the periphery which can direct polymer growth in lateral directions. Other reactions, such as amide bond formation, can be used for the synthesis of polymer nanocapsules in this approach. This novel approach to polymer nanocapsules represents a rare example of self-assembly of molecular components into nanometer-scale objects with interesting structures, shapes, and morphology through irreversible covalent bond formation.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-28/ja1039242/production/images/medium/ja-2010-039242_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja1039242'>ACS Electronic Supporting Info</A></P>
신동우(Dongwoo Shin),한형석(Hyungsuk Han),김동성(Dongsung Kim),이재경(Jaikyung Lee),김현수(Hyunsoo Kim),박태원(Taewon Park),임원식(Wonsik Lim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The Internet-based performance analysis system, called P-DYN, for automotive powetrains is developed. All the interfaces of the system are accessible via Web browsers, such as Netscape or Explorer. P-DYN/Processor, P-DYN/Plot as a preprocessor, postprocessor of P-DYN is developed in JAVA, DB. The P-DYN/Solver for predicting the powertrain performance is ran on the server. Anyone who wants to analyze powertrain performance or share the results data can access the analysis system on the Internet regardless of their OS, platform, or location.