PL
 |
EN
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 13

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Brain-wide mapping of oxytocin receptor neurons in the developing postnatal mouse brain
100%
Kim Y.
Acta Neurobiologiae Experimentalis
|
2019
|
tom 79
|
nr Suppl.1
EN
Oxytocin is a neuropeptide with functions including the development and expression of social behavior. Despite its significance, brain-wide spatial and temporal expression patterns of the oxytocin receptor (OTR), the main mediator of the oxytocin ligand, remain largelyunknown. Here, we examined the expression patterns of oxytocin receptor-positive neurons at different developmental time points (P7, P14, P21, P28) and in adulthood (P56) using a transgenic reporter line (OTR‑GFP). We used serial two-photon tomography for whole brain imaging at cellular resolution and a data processing pipeline that allows us to map fluorescently labeled cells throughout the entire brain with our newly developed postnatal 3D atlases. We found temporally different expression peaks in different brain regions including neocortex. We further investigated OTR expression patterns in OTR heterozygote reporter mice (OTR-Venus) and found an overall delayed expression pattern, which may be linked to impaired social behavior in the OTR‑Venus mice. We envision that our highly detailed OTR expression map will guide future circuit-based investigations to understand the mechanisms of oxytocin signaling in various behavioral assays.
2
Load balancing algorithm for parallel vision system using cots pcs and networks
63%
Kim Y. , Kim B.
Image Processing & Communications
|
2002
|
tom Vol. 8, no 2
43-56
EN
We developed a real-time parallel vision system (PAVIS) along with suitable parallel vision algorithms. PAVIS is designed for cost-effectiveness and flexibility, which is composed of several isotypic commercially off-the-shelf (COTS) PCs with an Ethernet switch that constitute a logically fully connected parallel system. Image partitioning method using the equal area criterion has been used for load distribution in parallel vision processing. Since the load is not the pixels but the feature points for high-level vision operations, we propose an image partitioning method named perpendicular image partitioning (PIP), which partitions image data not by the area of image but by the number of features. PIP functions as an efficient load distribution method, since image partitioning and load balancing are simultaneously performed. Real-time vision algorithm for corner detection and feature matching are also devised. Since the objects on the temporally successive sequence of image have motion continuity, we can speedup vision operations by reducing search area for corners or matching pairs along the motion trajectories found from the prey ions image frames. PAVIS is applied to the real-time depth determination problem for mobile robot navigation. The experimental results confirm the validity of proposed algorithms, and its real-time performance within the frame rate.
3
Content available Synthesis and Characterization of Black CoFe2O4 Pigments Using MOOH (M = Fe and Co) Nanorod
51%
Yu R. , Yun J. , Kim Y.
Archives of Metallurgy and Materials
|
2017
|
tom Vol. 62, iss. 2B
1231--1234
EN
We studied the coloration and phase transformation of various iron based pigment with cobalt substitution method and heat treatment. First, we synthesized well defined one dimension β-Fe/CoOOH nanorods using the solid solution method. Yellowish β-Fe/CoOOH nanorods were transformed into reddish intermediate states and, finally, black CoFe2 O4 pigments was obtained. Divalent cobalt ions easily occupied tetrahedral sites. The prepared pigments were well characterized in terms of physical properties by using UV-vis, CIE Lab color parameter measurements, SEM (scanning electron microscopy) and XRD (powder X-ray diffraction). In addition, the magnetization property of the prepared CoFe2 O4 pigment was confirmed by VSM (vibrating sample magnetometer).
4
Content available Synthesis And Characterization Of SiO2, SnO2 And TiO2 Metal Oxide Shells Covering Cu2O Particles
51%
Yu R. , Yun J. , Kim Y.
Archives of Metallurgy and Materials
|
2015
|
tom Vol. 60, iss. 2B
1159--1163
EN
In this work is described a means of improving the chemical stability of Cu2O@SiO2, Cu2O@SnO2 and Cu2O@TiO2 materials. The SiO2, SnO2 and TiO2 coated samples were stable from pH 3 to pH 10 for up to seven days. To determine the stability of the coated nanoparticles, and their colloidal solutions under acidic and basic conditions, colloidal nanoparticle solutions with various pH values were prepared and monitored over time. Details of the effect of variations in pH on the phase stability of core-shell type Cu2O were characterized using transmission electron microscopy and X-ray diffraction.
5
Content available High Purity Tungsten Spherical Particle Preparation From WC-Co Spent Hard Scrap
51%
Han C. , Na H. , Choi H. , Kim Y.
Archives of Metallurgy and Materials
|
2015
|
tom Vol. 60, iss. 2B
1507--1509
EN
Tungsten carbide-cobalt hard metal scrap was recycled to obtain high purity spherical tungsten powder by a combined hydrometallurgy and physical metallurgy pathway. Selective leaching of tungsten element from hard metal scrap occurs at solid / liquid interface and therefore enlargement of effective surface area is advantageous. Linear oxidation behavior of Tungsten carbide-cobalt and the oxidized scrap is friable to be pulverized by milling process. In this regard, isothermally oxidized Tungsten carbide-cobalt hard metal scrap was mechanically broken into particles and then tungsten trioxide particle was recovered by hydrometallurgical method. Recovered tungsten trioxide was reduced to tungsten particle in a hydrogen environment. After that, tungsten particle was melted and solidified to make a spherical one by RF (Ratio Frequency) thermal plasma process. Well spherical tungsten micro-particle was successfully obtained from spent scrap. In addition to the morphological change, thermal plasma process showed an advantage for the purification of feedstock particle.
6
Content available Design Of A Bi-Functional α-Fe2O3/Zn2SiO4:Mn2+ By Layer-By-Layer Assembly Method
51%
Yu R. , Yun J. , Pee J.-H. , Kim Y.
Archives of Metallurgy and Materials
|
2015
|
tom Vol. 60, iss. 2B
1165--1167
EN
This work describes the design of bi-functional α-Fe2O3/Zn2SiO4:Mn2+ using a two-step coating process. We propose a combination of pigments (α-Fe2O3) and phosphor (Zn2SiO4:Mn2+ ) glaze which is assembled using a layer-by-layer method. A silica-coated α-Fe2O3 pigment was obtained by a sol-gel method and a Zn2+ precursor was then added to the silica-coated α-Fe2O3 to create a ZnO layer. Finally, the Zn2SiO4:Mn2+ layer was prepared with the addition of Mn2+ ions to serve as a phosphor precursor in the multi-coated α-Fe2O3, followed by annealing at a temperature above 1000°C. Details of the phase structure, color and optical properties of the multi-functional α-Fe2O3/Zn2SiO4:Mn2+ were characterized by transmission electron microscopy and X-ray diffraction analyses.
7
Dwutlenek węgla jako zamiennik R 22 w domowych urządzeniach klimatyzacyjnych. Część 2
51%
Brown J. S. , Kim Y. , Domański P. A.
Technika Chłodnicza i Klimatyzacyjna
|
2005
|
tom nr 4
132-137
PL
W artykule porównano pracę dwutlenku węgla i czynnika R 22 w domowym urządzeniu klimatyzacyjnym, z wykorzystaniem półempirycznych modeli obiegu sprężarkowego parowego i nadkrytycznego. Analizę przeprowadzono dla mikrokanałowych wymienników ciepła o różnej wielkości zastosowanych w konstrukcji urządzeń. Układ z R 22 uzyskał znacznie wyższy współczynnik COP niż obieg R 744, co oznacza, że lepsze własności kinetyczne tego ostatniego i wyższa sprawność izentropowa jego sprężarki nie rekompensują wad obiegu nadkrytycznego w zastosowaniu do klimatyzacji komfortu. Wyniki analizy produkcji entropii w poszczególnych podzespołach wskazują, że procesy w parowniku cechują się mniejszym stopniem nieodwracalności w przypadku dwutlenku węgla. Jednak chłodnica gazu i zawór rozprężny dla tego czynnika przyczyniają się do większej produkcji entropii nich w ich odpowiednikach dla R 22 i w największym stopniu wpływają na niskie wartości współczynnika COP w przypadku układu z R 7 44.
EN
The paper compares the performance of CO2 and R 22 in residential air conditioning applications using semi-theoretical vapour compression and trans-critical cycle methods. The microchannel heat exchangers have been analysed in the paper. The R 22 system had a significantly better coefficient of performance then the CO2 system when equivalent heat exchangers were used in both systems. This indicates that the better transport properties and compressor isentropic efficiency of CO2 did not compensate for the thermodynamic disadvantage of the transcritical cycle in comfort cooling applications. An entropy generation analysis showed that CO2 evaporator operated with fewer irreversibilities then did R 22 evaporator. However, the CO2 gas cooler and expansion device generated more entropy than their R 22 counterparts and were mainly responsible for the low COP of the R 744 system.
8
Content available Evaluation of an Incentive-Based Obesity Management Program in a Workplace
51%
Hwang G. , Yoon C. , Jung H. , Kim Y.
International Journal of Occupational Safety and Ergonomics
|
2011
|
tom Vol. 17, No. 2
147--154
EN
This study is to analyze the effectiveness of an incentive-based obesity management program (the Midas Project aimed to improve good health habits) at an electronics company in 2005. A total of 95 company participants with a high body mass index (BMI) were recruited for a health promotion program for 3 months that awarded gold medals as an incentive for body fat loss. BMI decreased from 28.8 to 27.8 kg/m² (p = .000), body weight decreased from 87.2 to 83.5 kg (p = .000), and body fat weight decreased from 25.4 to 23.3 kg (p = .000). Systolic and diastolic blood pressure decreased from 130.5 to 125.1 mmHg (p = .002), from 86.4 to 81.7 mmHg (p = .009). The percentage of participants exercising more than 3 times per week increased from 27.3 to 52.3% (p = .000). The percentage who avoided overeating at parties and midnight eating increased from 65.9 to 72.7% (p = .767) and 70.5 to 84.1% (p = .172), respectively. This incentive-based obesity management program was effective in improving not only BMI but also health status.
9
W kierunku bardziej spójnego projektowania konstrukcji ze szkła laminowanego
51%
Dunham M. R. , Kim Y. , Knapp K.
Świat Szkła
|
2018
|
tom R. 23, nr 12
33--41, 45
10
Dwutlenek węgla jako zamiennik R 22 w domowych urządzeniach klimatyzacyjnych. Cz. 1
51%
Brown J. S. , Kim Y. , Domański P. A.
Technika Chłodnicza i Klimatyzacyjna
|
2005
|
tom nr 3
93-98
PL
W artykule porównano pracę dwutlenku węgla i czynnika R 22 w domowym urządzeniu klimatyzacyjnym, z wykorzystaniem półempirycznych modeli obiegu sprężarkowego parowego i nadkrytycznego. Analizę przeprowadzono dla mikrokanałowych wymienników ciepła o różnej wielkości zastosowanych w konstrukcji urządzeń. Układ z R 22 uzyskał znacznie wyższy współczynnik COP niż obieg R 744, co oznacza, że lepsze własności kinetyczne tego ostatniego i wyższa sprawność izentropowa jego sprężarki nie rekompensują wad obiegu nadkrytycznego w zastosowaniu do klimatyzacji komfortu.
EN
The paper compares the performance of CO2 and R 22 in residential air conditioning applications using semi-theoretical vapour compression and trans-critical cycle methods. The microchannel heat exchangers have been analysed in the paper. The R 22 system had a significantly better coefficient of performance then the CO2 system when equivalent heat exchangers were used in both systems. This indicates that the better transport properties and compressor isentropic efficiency of CO2 did not compensate for the thermodynamic disadvantage of the transcritical cycle in comfoer cooling applications.
11
Content available remote Gas chromatographic determination of phenol in fish tissues as a phenyl acetate derivative following solvent extraction of acidified samples
45%
Kim H. , Kim Y. , Park S. , Lee J. , Choi J.
Acta Chromatographica
|
2020
|
tom Vol. 32, no. 1
64--67
EN
This study aimed to develop a chromatographic method to quantitatively determine phenol in fish tissues. This method involves solvent extraction of acidified samples, followed by derivatization to phenyl acetate and analysis with gas chromatography coupled with mass spectrometry (GC–MS). Phenol in a representative tissue sample (belly, gill, or renal tubules), which was homogenized with 2 N sulfuric acid, was extracted with ethyl acetate and derivatized to phenyl acetate using acetic anhydride and K2CO3 in water. An n-butyl acetate extract was injected into the GC–MS. The linearity (r2) of the calibration curve was greater than 0.996. The analytical repeatability, which is expressed as the relative standard deviation, was less than 6.14%, and the recovery was greater than 96.3%. The method detection limit and the limit of quantitation were 8.0 μg/kg and 26 μg/kg, respectively. The proposed method is also applicable to the analysis of other biological tissues for phenol and its analogs, such as pentachlorophenol.
12
Content available Fabrication of Mo-Si-B Intermetallic Compound Powders Under Different Heat Treatment Conditions
38%
Park J. H. , Lee S. , Kim D. , Kim Y. , Yang S. H. , Lee S. H.
Archives of Metallurgy and Materials
|
2018
|
tom Vol. 63, iss. 3
1509--1512
EN
In this research, we investigated the effects of reduction atmospheres on the creation of the Mo-Si-B intermetallic compounds (IMC) during the heat treatments. For outstanding anti-oxidation and elevated mechanical strength at the ultrahigh temperature, we fabricated the uniformly dispersed IMC powders such as Mo5SiB2 (T2) and Mo3Si (A15) phases using the two steps of chemical reactions. Especially, in the second procedure, we studied the influence of the atmospheres (e.g. vacuum, argon, and hydrogen) on the synthesis of IMCs during the reduction. Furthermore, the newly produced IMCs were observed by SEM, XRD, and EDS to identify the phase of the compounds. We also calculated an amount of IMCs in the reduced powders depending on the atmosphere using the Reitveld refinement method. Consequently, it is found that hydrogen atmosphere was suitable for fabrication of IMC without other IMC phases.
13
Content available Synthesis and Characterization of Black CoFe2O4 Pigments Using MOOH (M = Fe and Co) Nanorod
23%
Yu R. , Yun J. , Kim Y.
|
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.