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Search Results: 1 - 10 of 31158 matches for " Nam-Ho Lee "
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Identification of Acceptable Restoration Strategies
Seung-Tae Cha,Nam-Ho Lee,Eung-Bo Shim,Jeong-Hoon Shin
Journal of Systemics, Cybernetics and Informatics , 2008,
Abstract: In recent years, we have seen several catastrophic and cascading failures of power systems throughout the world. Power system breakup and blackouts are rare events. However, when they occur, the effects on utilities and general population can be quite severe. To prevent or reduce cascading sequences of events caused by the various reasons, KEPRI is researching ways to revolutionize innovative strategies that will significantly reduce the vulnerability of the power system and will ensure successful restoration of service to customers. This paper describes a restoration guidelines / recommendations for the KEPS simulator, which allows power system operator and planner to simulate and plan restoration events in an interactive mode. The KEPS simulator provides a list of restoration events according to the priority based on some restoration rules and list of priority loads. Further, the paper will draw on research using information from a Jeju case study.
Early Referral to a Nephrologist Improved Patient Survival: Prospective Cohort Study for End-Stage Renal Disease in Korea
Do Hyoung Kim, Myounghee Kim, Ho Kim, Yong-Lim Kim, Shin-Wook Kang, Chul Woo Yang, Nam-Ho Kim, Yon Su Kim, Jung Pyo Lee
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0055323
Abstract: The timing of referral to a nephrologist may influence the outcome of chronic kidney disease patients, but its impact has not been evaluated thoroughly. The results of a recent study showing an association between early referral and patient survival are still being debated. A total of 1028 patients newly diagnosed as end-stage renal disease (ESRD) from July 2008 to October 2011 were enrolled. Early referral (ER) was defined as patients meeting with a nephrologist more than a year before dialysis and dialysis education were provided, and all others were considered late referral (LR). The relationship of referral pattern with mortality in ESRD patients was explored using a Cox proportional hazards regression models. Time from referral to dialysis was significantly longer in 599 ER patients than in 429 LR patients (62.3±58.9 versus 2.9±3.4 months, P<0.001). Emergency HD using a temporary vascular catheter was required in 485 (47.2%) out of all patients and in 262 (43.7%) of ER compared with 223 (52.0%) of LR (P = 0.009). After 2 years of follow-up, the survival rate in ER was better than that in LR (hazard ratio [HR] 2.38, 95% confidence interval [CI] 1.27–4.45, P = 0.007). In patients with diabetes nephropathy, patient survival was also significantly higher in ER than in LR (HR 4.74, 95% CI 1.73–13.00, P = 0.002). With increasing age, HR also increased. Timely referral to a nephrologist in the predialytic stage is associated with reduced mortality.
(2,2′-Bipyridine-κ2N,N′)dibromidopalladium(II) dichloromethane solvate
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809039701
Abstract: In the title compound, [PdBr2(C10H8N2)]·CH2Cl2, the Pd2+ ion is four-coordinated in a slightly distorted square-planar environment by two N atoms of the chelating 2,2′-bipyridine ligand and two bromide ions. The compound displays intramolecular C—H...Br hydrogen bonds and pairs of complex molecules are assembled by intermolecular C—H...Br hydrogen bonds. These pairs are connected by additional C—H...Br hydrogen bonds, forming a layer structure extending parallel to (011). Intermolecular π–π interactions between the pyridine rings of the ligand are also present, the shortest centroid–centroid distance being 4.090 (9) .
Hexane-1,6-diammonium bis(pyridine-2-carboxylate)
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809019424
Abstract: The title compound, C6H18N22+·2C6H4NO2 , consists of a doubly protonated hexamethylenediammonium dication and two pyridine-2-carboxylate anions. These ions interact by means of intermolecular N—H...O and N—H...N hydrogen bonds to form a two-dimensional array. The carboxylate groups of the anions appear to be delocalized on the basis of the C—O bond lengths.
catena-Poly[[diaquadibromidomanganese(III)]-μ-pyridine-2-carboxylato]
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s160053680902844x
Abstract: The asymmetric unit of the title compound, [MnBr2(C6H4NO2)(H2O)2]n, contains one monomeric unit of the neutral linear coordination polymer. The Mn3+ ions are bridged by anionic pyridine-2-carboxylate (pic) ligands, thereby forming a chain-like structure along the c axis, and are six-coordinated in a distorted octahedral environment by two O atoms of the two different carboxylate groups, two O atoms of two water molecules and two Br atoms. The complex displays intermolecular O—H...Br, O—H...N, O—H...O, C—H...O and C—H...Br hydrogen bonding. There may also be intermolecular π–π interactions between adjacent pyridine rings, with a centroid–centroid distance of 3.993 (8) .
Tetra(chlorido/iodido)(1,10-phenanthroline)platinum(IV) hemi[di(chlorine/iodine)]
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809007703
Abstract: The asymmetric unit of the title compound, [PtCl3.66I0.34(C12H8N2)]·0.5(Cl0.13I1.87), contains a neutral PtIV complex and one half of a halogen molecule. The PtIV ion is six-coordinated in a distorted octahedral environment by two N atoms of the 1,10-phenanthroline ligand and Cl or I atoms. The refinement of the structure and the EDX analysis indicate that the compound is a solid solution in which there is some substitution of Cl for I and vice versa. The chemical formula of the pure state of the compound would have been [PtCl4(C12H8N2)]·0.5I2. In the analysed crystal, two Cl atoms are partially (ca 25% and 9%) replaced by I atoms, and the I2 molecule has a minor component modelled as ICl. As a result of the disorder, the different trans effects of the N and Cl/I atoms are not distinct. The complex displays intermolecular π–π interactions between the six-membered rings, with a centroid–centroid distance of 3.771 (4) . There are also weak intramolecular C—H...Cl hydrogen bonds.
[(2,3,5,6-η)-Bicyclo[2.2.1]hepta-2,5-diene]dibromidopalladium(II)
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809020583
Abstract: In the title complex, [PdBr2(C7H8)], the PdII ion lies in a distorted square-planar environment defined by the two Br atoms and the mid-points of the two π-coordinated double bonds of bicyclo[2.2.1]hepta-2,5-diene. The complex is disposed about a crystallographic mirror plane parallel to the ac plane passing through the Pd, Br atoms and the centre of the diene ligand.
Tetrakis(pyridine-2-carboxylato-κ2N,O)palladium(IV) dihydrate
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809039270
Abstract: The asymmetric unit of the title compound, [Pd(C6H4NO2)4]·2H2O, consists of a quarter of a neutral PdIV complex and half of a solvent water molecule. In the complex, the PdIV ion is located on a fourfold inversion axis and eight-coordinated in a distorted dodecahedral environment by four N and four O atoms from four symmetry-related pyridine-2-carboxylate (pic) anionic ligands. In the crystal, the water molecule is involved in O—H...O hydrogen bonding, and weak intermolecular C—H...O hydrogen bonds occur. There are also intermolecular π–π interactions between adjacent pyridine rings, with a centroid–centroid distance of 3.715 (3) .
Butane-1,4-diammonium bis(pyridine-2-carboxylate) monohydrate
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809031493
Abstract: The asymmetric unit of the title compound, C4H14N22+·2C6H4NO2 ·H2O, consists of half of a doubly protonated tetramethylenediammonium dication, a pyridine-2-carboxylate anion and half of a solvent water molecule; the dication is located on a centre of inversion and a twofold rotation axis passes through the O atom of the water molecule. The carboxylate group of the anion appears to be delocalized on the basis of the C—O bond lengths. In the crystal structure, the components are linked by intermolecular N—H...O, N—H...N and O—H...O hydrogen bonds.
4,11-Diaza-1,8-diazoniacyclotetradecane bis(pyridine-2-carboxylate) dihydrate
Nam-Ho Kim,Kwang Ha
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809037258
Abstract: The asymmetric unit of the title compound, C10H26N42+·2C6H4NO2 ·2H2O, consists of half of a doubly protonated 1,4,8,11-tetraazacyclotetradecane (cyclam) dication, a pyridine-2-carboxylate anion and a solvent water molecule. The complete dication is generated by a crystallographic centre and adopts an endodentate conformation which may be influenced by intramolecular N—H...N hydrogen bonding. The carboxylate group of the anion appears to be delocalized on the basis of the C—O bond lengths [1.257 (2) and 1.250 (2) ]. In the crystal structure, the components are linked by intermolecular N—H...O, N—H...N and O—H...O hydrogen bonds.
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