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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean hydrogen and new energy society
Journal Basic Information
Journal DOI :
The Korean Hydrogen and New Energy Society
Editor in Chief :
Volume & Issues
Volume 22, Issue 6 - Dec 2011
Volume 22, Issue 5 - Oct 2011
Volume 22, Issue 4 - Aug 2011
Volume 22, Issue 3 - Jun 2011
Volume 22, Issue 2 - Apr 2011
Volume 22, Issue 1 - Feb 2011
Selecting the target year
Development of the SiO
/Nano Ionomer Composite Membrane for the Application of High Temperature PEMFC
Na, Hee-Soo ; Hwang, Hyung-Kwon ; Lee, Chan-Min ; Shul, Yong-Gun ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 569~578
membranes for polymer electrolyte membrane fuel cell (PEMFC) are preapared by electrospinning method. It leads to high porosity and surface area of membrane to accommodate the proton conducting materials. The composite membrane was prepared by impregnating of Nafion ionomer into the pores of electrospun
:heteropolyacid (HPA) nano-particles as a inorganic proton conductor were prepared by microemulsion process and the particles are added to the Nafion ionomer. The characterization of the membranes was confirmed by field emission scanning electron microscope (FE-SEM), thermogravimetry analysis (TGA), and single cell performance test for PEMFC. The Nafion impregnated electrospun
membrane showed good thermal stability, satisfactory mechanical properties and high proton conductivity. The addition of the
:HPA nano-particle improved proton conductivity of the composite membrane, which allow further extension for operation temperature in low humidity environments. The composite membrane exhibited a promising properties for the application in high temperature PEMFC.
Preparation and Properties of Sulfonated Poly(ether Sulfone)s Containing BFBN for PEMFC
Lim, Young-Don ; Seo, Dong-Wan ; Lee, Hyun-Chul ; Jin, Hyun-Mi ; Hossain, MD. Awlad ; Jeong, In-Seok ; Kim, Whan-Gi ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 579~584
Sulfonated poly (ether sulfone)s containing BFBN
were prepared from 2,3-bis(4-fluorophenyl)-2-butenedinitrile
, 4,4-sulfonyldiphenol and sulfonated 4,4'-difluorodiphenylsulfone sodium salt
using potassium carbonate, and followed acidification reaction with 1M
. BFBN was prepared from 4-fluorobenzylcyanide,
, NaOH using trimethylbenzylammoniumchloride
. Sulfonated poly(ether sulfone)s containing BFBN were studied by FT-IR,
-NMR spectroscopy, and thermo gravimetric analysis (TGA). The water uptake of synthesized S-PBFBN membranes exhibit 31~62% compared with 28% of Nafion 211. The S-PBFBN membranes exhibit proton conductivities (
, RH 100) of 53.8~117.4 mS/cm compared with 137.4 mS/cm of Nafion 211.
Development of High Performance MEA by Decal Method for PEM Fuel Cell
Lee, Ki-Sub ; Lee, Jae-Seung ; Kwon, Nak-Hyun ; Hwang, In-Chul ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 585~591
This study has focused on the development of high performance membrane-electrode assemblies (MEAs) fabricated by decal method for proton exchange membrane fuel cell (PEMFC). To study the effect of ionomer contents on performance, we fabricated MEAs with several electrodes which were prepared by varying the quantity of ionomer from 20 wt.% to 45 wt.% in catalyst layer. The MEA performance was obtained through single cell test. The MEA prepared from electrode with 25wt.% of ionomer showed the best performance. We evaluated the surface area and pore volume of electrode with BET. We found that the surface area and pore volume in electrode decreased rapidly at the electrode with 40wt.% of ionomer in catalyst layer. MEA was fabricated by roll laminator machine and the roll laminating conditions for the preparation of MEA, such as laminating press, temperature and speed, were optimized. The MEA performance is not affected by laminating temperature and speed, but roll laminating press have a great effect on MEA performance.
Effect of Microstructure on Mechanical and Electrical Properties in Ni-YSZ of Anode Supported SOFC
Choi, Mi-Hwa ; Choi, Jin-Hyeok ; Lee, Tae-Hee ; Yoo, Young-Sung ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 592~598
Electrode of solid oxide fuel cell must have sufficient porosity to allow gas transport to the interface with electrolyte effectively but high porosity has a negative impact on structural stability in electrode support. Thus, the upper limit of porosity is based on consideration of mechanical strength of electrode. In this study, the effect of microstructure of Ni-YSZ anode supported SOFC on the mechanical and electrical property was investigated. LSCF composite cathode and 8YSZ electrolyte were used. The porosity of the anode was modified by the amount of graphite powder and added graphite contents were 24, 18, 12 vol%, respectively. The higher the porosity, the better the electrical performance,
. While the flexural strength decreased with increasing the amount of graphite. But the rate of increase in electrical performance and the rate of decrease in mechanical strength were not directly proportional to amount of graphite. The optimum graphite content incorporating both electrical and mechanical performance was 18 vol%.
Influence of the Thin Anode Geometry on the Performance of Molten Carbonate Fuel Cells
Seo, Dong-Ho ; Park, Dong-Nyeok ; Yoon, Sung-Pil ; Han, Jong-Hee ; Oh, In-Hwan ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 599~608
The Ni-Al anodes of the molten carbonate fuel cell (MCFC) with three different structures were successfully fabricated in order to reduce the thickness of the anode down to 0.3 mm; one was the non-supported anode made by a conventional tape casting method, and others were the supported anodes made by lamination or direct casting on the nickel screen. It was seen from the physical analyses and cell operation that the supported thin anodes made by direct casting showed good mechanical strength and cell performance because of a good contact between the anode materials and the support. The single cell using the above anode showed the cell voltage of 0.858 V at the current density of 150
with the nitrogen cross-over of only 0.6% at the operation time of 1,000 h, which was similar to the performance of the conventional thick (0.7 mm) anode. The ability to utilize a thin configuration of anode should cut down the amount of nickel alloy and consequently reduce its manufacturing cost.
Operation Results of a 5kW-Class SOFC System Composed of 2 Sub-Module Stacks
Lee, Tae-Hee ; Choi, Mi-Hwa ; Yoo, Young-Sung ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 609~615
A 5 kW class SOFC system for cogeneration power units was consisted of a hot box part and cold BOPs. High temperature components such as a stack, a fuel reformer, a catalytic combustor, and heat exchanges are arranged in the bot box considering their operating temperatures for the system efficiency. The hot box was made of ceramic boards for the thermal insulation. A 5 kW class SOFC stack was composed of 2 sub-modules and each module had 64 cells with
area and stainless steel interconnects. The 5 kW class SOFC system was operated with a hydrogen and a city gas. With a hydrogen, the total power of the stacks was about 7.1 kWDC and electrical efficiency was about 49.3% at 80 A. With a city gas, the total power of the stacks was about 5.7
and electrical efficiency was about 38.8% at 60 A. Under self-sustained operating condition, the system efficiency including a power conditioning loss and a consumed power by BOPs was about 30.2%.
Hydrogen Storage and Release by Redox Reaction of Fe/Zr/Mo Mixed Oxide Mediums
Je, Han-Sol ; Kang, Eun-Jee ; Lee, Su-Gyung ; Park, Chu-Sik ; Kim, Young-Ho ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 616~624
Hydrogen storage and release of Fe/Zr/Mo mixed oxide mediums were investigated by hydrogen reduction and water splitting oxidation(
). As the results of TPR/O, Mo was an additive to enhance the reactivity of water splitting oxidation as well as the stability of the medium. On the other hand, it seemed that
additive provided the passway for the diffusion of gaseous chemicals on the medium in repeated redox cycles. Among the Fe/Zr/Mo mediums, a FeZrMo-7 medium (Fe/Zr/Mo=80/13/7mol%) exhibited the best performance with good durability during five repeated redox cycles. The amount of hydrogen evolved on the medium was maintained at ca. 10.7mmol-
/g-medium corresponding to the hydrogen storage amount of ca. 2.2wt%.
Operating Strategy Optimization of Metal Hydride based Hydrogen Supply System
Kim, Byung-Jun ; Sung, Hae-Jung ; Lee, Young-Duk ; Lee, Sang-Min ; Cho, Ju-Hyeong ; Ahn, Kook-Young ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 625~633
Characteristics of a commercial metal hydride (MH) hydrogen supply system have been investigated and an operating strategy was developed based on the experimental data. As a prior step, charging/discharging capacity, thermal properties such as heat capacity, heat of reaction of MH system were experimentally measured. And then P-C-T data for various operating conditions were collected and a correlation between P, C and T predicting the behavior of MH was derived. Based on the basic experimental data, an operating strategy of MH system was developed, in which the hot water temperature supplied into the water jacket of MH was controlled depending on the pressure of MH, thereby the pressure of MH could be maintained at a suitable range. By adjusting the temperature of hot water from
, the maximum discharging capacity of hydrogen could be increased by 4.7%, and consequently more stable hydrogen supply and longer operation time of fuel cell system could be achieved.
Cycling Properties of 80wt% AB
-15wt% Mg-5wt% Mm Metal Hydride made by Hydriding Combustion Synthesis
Hur, Tae-Hong ; Han, Jeong-Seb ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 634~640
The effect of cycling on the absorption and desorption characteristics of the 80 wt%
-15 wt% Mg-5 wt% Mm system was investigated. The material was made by Hydrogen Combustion Synthesis. The cycling experiment was performed at 298 K, 30 atm for 15 min. During the reaction time, the amount of absorption was fully desorbed. After the full activation, the hydrogen storage capacity was 1.57 wt% and the capacity was maintained until 50 cycles. And the reaction rate does not change with an increase in the number of cycles. This material has good durability and reversible feature.
Long-Term Performance of Lab-Scale High Temperature Electrolysis(HTE) System for Hydrogen Production
Choi, Mi-Hwa ; Choi, Jin-Hyeok ; Lee, Tae-Hee ; Yoo, Young-Sung ; Koh, Jae-Hwa ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 641~648
KEPRI (KEPCO Research Institute) designed and operated the lab-scale high temperature electrolysis (HTE) system for hydrogen production with
5-cell stack at
. The electrolysis cell consists of Ni-YSZ steam/hydrogen electrode, YSZ electrolyte and LSCF based perovskite as air side electrode. The active area of one cell is 92.16
. The hydrogen production system was operated for 2664 hours and the performance of electrolysis stack was measured by means of current variation with from 6 A to 28 A. The maximum hydrogen production rate and current efficiency was 47.33 NL/hr and 80.90% at 28 A, respectively. As the applied current increased, hydrogen production rate, current efficiency and the degradation rate of stack were increased respectively. From the result of stack performance, optimum operation current of this system was 24 A, considering current efficiencies and cell degradations.
Development of Mixed Conducting Ceramic Membrane for High Purity Hydrogen and Carbon Production from Methane Direct Cracking
Kim, Ji-Ho ; Choi, Duck-Kyun ; Kim, Jin-Ho ; Cho, Woo-Seok ; Hwang, Kwang-Taek ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 649~655
Methane direct cracking can be utilized to produce
-free hydrogen for PEM fuel cells, oil refineries, ammonia and methanol production. We present the results of a systematic study of methane direct cracking using a mixed conducting oxide, Y-doped
), membrane. In this paper, dense
membrane with disk shape was successfully sintered at
with a relative density of more 93% via addition of 1 wt% ZnO. The (
) membrane is covered with Pd as catalyst for methane decomposition with an DC magnetron sputtering method. Reaction temperature was
and high purity methane as reactant was employed to membrane side with 1.5 bar pressure. The
produced by the reaction was transported through mixed conducting oxide membrane to the outer side. In addition, it was observed that the carbon, by-product, after methane direct cracking was deposited on the Pd/ZnO-
membrane. The produced carbon has a shape of sphere and nanosheet, and a particle size of 80 to 100 nm.
Investigation of Photocatalytic Activity with a Metal Doped TiO
Nanotubular Electrode for Hydrogen Production
Lee, Jae-Min ; Lee, Chang-Ha ; Yoon, Jae-Kyung ; Joo, Hyun-Ku ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 656~662
The purpose of this study was to correlate between photoelectrochemcial hydrogen production rate and electron transfer with various types of metal doped
nanotubes as photoanodes. In order to fabricate light sensitized photoanode, CdS,
, and Pt were doped by electrodeposition method. As the results of experiments, the electron transfer was favorable from higher position to lower position of conduction band (CB). In consequence, the higher hydrogen production rate was as follows, CdS/
) > Pt/
). The surface characterizations exhibited that crystal structure, morphological and electrical properties of various metal depoed
nanotubes by the results of SEM, TEM, XPS, and photocurrent measurements.
Synchronization of Cell Cycle in Korean Hydrogen Producing Cyanobacterial Strains
Park, Jong-Woo ; Ahn, Se-Hee ; Kim, Hyung-Seop ; Yih, Won-Ho ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 663~670
Under a daily photoperiod of 14h light and 10h dark synchronization of cell cycle in Korean Cyanothece spp. strains and
sp. strain Miami BG043511 was analyzed as to be applicable to enhanced hydrogen production. For all strains peaks of double cell were observed during the light period of a daily cycle. Peaks of maximal cell size measured by a coulter counter appeared at the peak of double cells observed under light microscope reconfirming the synchronization of daily cell cycle. The cell cycle synchronization became weakened within two days when treated with continuous illumination. Rapid detection of the peak time of double cell percentage by coulter counters may contribute to quasi-realtime feedback control for efficient production of photobiological hydrogen by unicellular cyanobacterial strains.
Hydrogen Production from Hyperthermophilic Archaebacteria Thermococcus onnurineus NA1
Kim, Ok-Sun ; Na, Jeong-Geol ; Kim, Hae-Jin ; Rhee, Young-Woo ; Kim, Mi-Sun ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 671~677
A hyperthermophilic archaeon,
NA1 was studied to investigate its fermentation characteristics using various carbon sources including formate, maltose and carbon monoxide during the anaerobic batch cultivation at
. Formate was the best carbon source for cell growth and hydrogen production among others. In the batch culture on formate, it was found that the cell concentration increased exponentially by 12 hrs of culture, after which the cell growth and formate consumption was retarded. Hydrogen production was continued more than 24 hrs although the cell growth was ceased at 18 hrs. Hydrogen production rate was directly correlated with the cell growth and formate degradation up to 18 hrs, and the average hydrogen production yield was 1.05 mole-
/mole-formate. Cell growth and hydrogen production were optimized at the initial pH 6-7, while inhibited at the initial pH lower than 5 and higher than 9.
The Design and Test of Ejectors for a 75-kW Fuel Cell System
Kim, Beom-Joo ; Kim, Do-Hyeong ; Lim, Hee-Chun ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 678~685
An Ejector enhances system efficiency, are easily operated, have a mechanically simple structure, and do not require a power supply. Because of these advantages, the ejector has been applied to a variety of industrial fields such as refrigerators, power plants and oil plants. In this work, an ejector was used to safely recycle anode tail gas in a 75-kW Molten Carbonate Fuel Cell (MCFC) system at KEPCO Research Institute. In this system, the ejector is placed at mixing point between the anode tail gas and the cathode tail gas or the fresh air. Commercial ejectors are not designed for the actual operating conditions for our fuel cell system. A new ejector was therefore designed for use beyond conventional operating limits. In the first place, a few sample ejectors were manufacured and the entrainment ratio was measured at a dummy stack. Through this experiment, the optimum ejector was chosen. The 75-kW MCFC system equipped with this optimum ejector was operated successfully.
Modeling of Solid Particle-Slag Interactions in Entrained Gasification Reactor
Chi, Jun-Hwa ; Kim, Ki-Tae ; Kim, Sung-Chul ; Chung, Jae-Hwa ; Ju, Ji-Sun ; Kim, Ui-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 686~698
Mathematical models for char-slag interaction and near-wall particle segregation developed by Montagnaro et. al. were applied to predict various aspects of coal gasification in an up-flow entrained gasifier of commercial scale. For this purpose, some computer simulations were performed using gPROMS as the numerical solver. Typical design parameters and operating conditions of the commercial gasifiers were used as input values for the simulation. Development of a densely dispersed phase of solid carbon was found to have a critical effect on both carbon conversion and ash flow behavior. In general, such a slow-moving phase was turned out to enhance carbon conversion by lengthening the residence time of char or soot particles. Furthermore, it was also found that guiding the transfer of char or soot into the closer part of the wall to coal burner is favorable in terms of gasification efficiency and vitrified ash collection. Finally, to a certain degree densely dispersed phase of carbon showed an yield-enhancing effect of syngas.
Performance Characteristics of Combined Heat and Power Generation with Series Circuit Using Organic Rankine Cycle
Kim, Kyoung-Hoon ; Jung, Young-Guan ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 699~705
A combined heat and power cogeneration system driven by low-temperature sources is investigated by the first and second laws of thermodynamics. The system consists of Organic Rankine Cycle (ORC) and an additional process heater as a series circuit. Seven working fluids of R152a, propane, isobutane, butane, R11, R123, isopentane and n-pentane are considered in this work. Maximum mass flow rate of a working fluid relative to that of the source fluid is considered to extract maximum power from the source. Results indicate that the second-law efficiency can be significantly increased due to the combined heat and power generation. Furthermore, higher source temperature and lower turbine inlet pressure lead to lower second-law efficiency of ORC system but higher that of combined system. Results also show that the optimum working fluid varies with the source temperature.
The Effects of Silica-Alumina Type Inorganic Compounds on the Pyrolysis Reaction of EVA to Produce Fuel-Oil
Bak, Young-Cheol ; Choi, Joo-Hong ; Oh, Se-Hui ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 706~713
The effects of silica-alumina type catalysts addition on the thermal decomposition of ethylene vinyl acetate (EVA) resin have been studied in a thermal analyzer (TGA, DSC) and a small batch reactor. The silica-alumina type compounds tested were kaolinite, bentonite, perlite, activated clay and clay. As the results of TGA experiments, pyrolysis starting temperature for EVA resin had the 1st pyrolysis temperature range of 300~
and the 2nd pyrolysis temperature range of 425~
. The silica-alumina type catalysts did not affect the pyrolysis rate in EVA pyrolysis reaction. In the DSC experiments, addition of kaolinite and bentonite catalysts reduced the heat of fusion and heat of 2nd pyrolysis reaction. In the batch system experiments, the mixing of silica-alumina type catalysts enhanced the yield of fuel oil, and affected to the distribution of carbon numbers. In the silica-alumina type inorganic material used in this experiments, bentonite was the most effective from the pyrolysis heat, yields, and the characteristics of fuel oil.
Effect of SO
on HC-SCR Kinetics over Ag/Al
Lee, Ju-Heon ; Park, Jeong-Whan ; Kim, Seong-Soo ; Yoo, Seung-Joon ; Kim, Jin-Gul ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 714~720
Ethanol was used as reducing agent to remove
exhaust from the stationary source. Pre-treatment with sulfuric acid over
catalyst was dedicated to overcome the
poisoning effect. The
reduction experiment was performed under the simulated condition of power plant The increased surface area with higher CPSI devoted to increase de-
yield of the
exhaust containing 20 ppm of
increased after acid treatment with 0.7%
, where the increased dispersion of Ag found from the results of XRD and XPS was the dominant factor for the increased de-
yield. However, the reason for the decreased de-
yield with the acid treatment of higher concentration (1.0% and 2.0%) of
was found to be due to the formation of
crystallites found from XRD result. Acid-treated
catalyst showed maximum de-
yield at higher temperature than non-treated
Electrochemical Oxidation of Carbon Felt for Redox Flow Battery
Jung, Young-Guan ; Hwang, Gab-Jin ; Kim, Jae-Chul ; Ryu, Cheol-Hwi ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 721~727
All vanadium redox-flow battery (VRFB) has been studied actively as one of the most promising electrochemical energy storage systems for a wide rage of applications such as electric vehicles, photovoltaic arrays, and excess power generated by electric power plants at night time. In this study, carbon felt electrodes were treated by electrochemical oxidation with KOH, and the cyclic voltammetry were studied in order to investigate redox reactivity of vanadium ion species with carbon felt electrodes. Besides the effect of electrochemical oxidation on the surface chemistry of carbon felt electrodes were investigated using the X-ray photoelectron spectroscopy (XPS). After electrochemical oxidation, XPS analysis of PAN based GF20-3 carbon felt electrode revealed on increase in the overall surface oxygen content of the carbon felts after electrochemical oxidation. Redox reaction characteristics using cyclic voltammetry (CV) were ascertained that the electrochemical treated electrode were more reversible than the untreated electrode.
Synthesis and Electrochemical Properties of LiFePO
by Citrate Process
Kim, Soo-Min ; Kim, Sang-Hun ; Kim, Jin-Ho ; Kim, Ung-Soo ; Hwang, Hae-Jin ; Cho, Woo-Seok ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 728~734
is a promising cathode material for secondary lithium batteries due to its high energy density, low cost and safety.
was synthesized by the citrate process under reductive, neutral, and oxidative, atmospheres and the crystal structure was analyzed by X-ray powder diffraction. The samples synthesized under
atmosphere showed a single phase of a olivine structure, where the samples synthesized under
atmosphere exhibited second phase of
. All the samples synthesized at 400, 600 and
atmosphere presented a single phase of olivine. Residual organic material was observed for the sample synthesized at
. There was nearly no intensity difference between the samples synthesized at
. The electrochemical characteristic of the
atmosphere was analyzed. The result exhibited an high discharge capacity of 160 mAh/g at the first cycle, and 155-160 mAh/g after 45 cycles.
A Study on Expansion of Lean Limit for Heavy-Duty DI Engine with Compressed Natural Gas
Quoc, Tran Dang ; Lee, Kwang-Ju ; Lee, Jong-Tai ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 735~740
Trend of Photo-Electrochemical Hydrogen Production Technology
Han, Hye-Jung ; Kang, Kyung-Seok ; Baeg, Jin-Ook ; Moon, Sang-Jin ; Kim, Jong-Wook ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 5, 2011, Pages 741~748
Hydrogen is clean and renewable, and recognized as a very promising energy resource to solve both depletion of petroleum and environmental problems caused by the use of fossil fuels. Extensive researches have been performed worldwide on the production technologies of hydrogen. In this paper, the technology trend of photo-electrochemical (PEC) hydrogen production was scrutinized based on the patent and paper analysis. Open/registered patents of US, JP, EP, and KR and SCI Journals related to the PEC hydrogen production technology between 1996~2010 were reviewed. Patents and papers were gathered by using the key-words searching method and filtered by desirable filtering criteria. The technology trend was discussed by classifying each patent and paper based on the publishing year, country, and organization, and analyzing the core patents and papers.