Jinsuk Kim

With the demand for high-energy-storage devices, the rechargeable metal-oxygen battery has attracted attention recently. Sodium-oxygen batteries have been regarded as the most promising candidates because of their lower-charge overpotential compared with that of lithium-oxygen system. However, conflicting observations with different discharge products have inhibited the understanding of precise reactions in the battery. Here we demonstrate that the competition between the electrochemical and che

Recently, metal-air batteries, such as lithium-air and zinc-air systems, have been studied extensively as potential candidates for ultra-high energy density storage devices because of their exceptionally high capacities. Here, we report such an electrochemical system based on sodium, which is abundant and inexpensive. Two types of sodium-oxygen batteries were introduced and studied, i.e. with carbonate and non-carbonate electrolytes. Both types could deliver specific capacities (2800 and 6000 mA

Abstract To address the urgent demand for sustainable battery manufacturing, this review contrasts traditional wet process with emerging dry electrode technologies. Dry process stands out because of its reduced energy and environmental footprint, offering considerable economic benefits and facilitating the production of high‐energy‐density electrodes. We spotlight technological innovations that exemplify the paradigm shift towards eco‐friendliness and cost‐efficiency. This review synthesizes the

Poor interfacial contact is often encountered in nanoparticulate film-based devices. The dye-sensitized solar cell (DSSC) is a representative case in which a nanoporous TiO(2) electrode needs to be prepared on the transparent conducting oxide (TCO)-coated glass substrate. In this study, we demonstrate that the inter-electrode contact resistance accounts for a considerable portion of the total resistance of a DSSC and its efficiency can be greatly enhanced by welding the interface with a laser. T

Abstract Lithium batteries with solid-state electrolytes are an appealing alternative to state-of-the-art non-aqueous lithium-ion batteries with liquid electrolytes because of safety and energy aspects. However, engineering development at the cell level for lithium batteries with solid-state electrolytes is limited. Here, to advance this aspect and produce high-energy lithium cells, we introduce a cell design based on advanced parametrization of microstructural and architectural parameters of el

Solubilities of lithium bromide in the water (1) + lithium bromide (2) + ethanolamine (3) system at three different ratios ( w 2 /w 3 = 4.5, 4, and 3.5) were measured by using the visual polythermal method in temperature ranges of (281.35 to 333.55) K, (281.65 to 333.55) K, and (275.45 to 345.95) K, respectively. Each set of experimental measurements was correlated with two least-squares regression equations as a function of temperature. The average absolute deviations between the experimental a

Abstract Keeping both the chemical and physical state of the electrode–electrolyte interface intact is one of the greatest challenges in achieving solid‐state batteries (SSBs) with longer cycle lives. Herein, the use of organic electrolyte additives in the cathode electrolyte interphase (CEI) layer to mitigate the intertwined chemical and mechanical degradation in sulfide‐based SSBs is demonstrated. Lithium difluorobis(oxalato)phosphate (LiDFBOP) and argyrodite (Li 6 PS 5 Cl) are used as a model

A radiometric characterization of the Korea Multi-Purpose Satellite (KOMPSAT) Series multispectral imagery was performed by the Korea Aerospace Research Institute (KARI) and the Pukyong National University Remote Sensing Group (PKNU RSG). This paper presents a vicarious radiometric calibration performed by KARI and PKNU RSG in 2012 and 2014. Correlations between top-of-atmosphere (TOA) radiances and the spectral band responses of the KOMPSAT-3 sensors at Zuunmod, Mongolia and Goheung, South Kore

A new falling particle receiver design with truncated-cone geometry has been developed. The design implemented a unique multi-stage particle falling concept with a combination of an inclined wall and wall-attached catch- and-release troughs. Combining truncated-cone geometry and four falling stages, overall solar energy absorptance of particle curtain was estimated to be higher than 92% in the design condition. Design capacity of the receiver is around 750kWt at solar noon on the equinox with a

We propose an efficient selective block encoding scheme with motion information feedback in distributed video coding (DVC). The proposed scheme estimates the spatial and temporal matching costs for each block in the side information (SI) and for the blocks with high matching costs, the motion information is provided to the encoder side to selectively encode the motion-compensated frame difference signal. Experimental results show that the proposed scheme outperforms the recently developed DVC al

Maintaining receiver’s thermal stresses and corrosion below the material limits are issues that need careful attention in solar thermal towers. Both depend on heliostats’ aiming points over the central receiver and available direct solar radiation at any instant. Since this technology relies on an unavoidable time-changing resource, aiming points need to be properly manipulated to avoid excessive hot spots. This paper proposes a new aiming point strategy based on a multivariable model predictive

1980년～2000년의 기간 동안 우리나라의 산업부문 최종에너지 소비량은 수송․가정․상업․기타부문의 최종에너지 소비량에 비해 더욱 가파르게 상승하였으며 외환위기의 영향도 다른 에너지 소비부문에 비해 적게 받고 있는 것으로 나타나고 있다. 본 연구는 꾸준한 증가추세로 나타난 국내 산업부문의 에너지 소비량의 변화 요인 및 산업계의 에너지 저소비형 산업구조 구축을 위한 노력 여부를 산업별로 분석하기 위하여 Chen and Rose(1990)의 two- tier KLEM모형형 구조분해분석(Structural Decomposition Analysis)모형을 확장하여 총 17가지 요인으로 1980년～2000년의 기간 동안의 국내에너지 소비량의 변화를 분석하였다. 본 연구에서 사용한 산업 분류는 2000년도 산업연관표에서 석탄과 석탄제품, 연료유, 전력, 도시가스의 에너지 부문과 대분류를 기준으로 한 28개 산업부문으로 분류하였으며 개별 산업별로 분석함으로써 산업별 에너지소비구조 변화 요인을

This paper proposes a simplified electromagnetic actuation system for the motion control of a micro-robot. The proposed system uses only two pairs of Helmholtz coils for two-dimensional motion generation, while conventional systems use two pairs of Helmholtz coils and Maxwell coils, respectively. It can make the system smaller and increase the workspace of the micro-robot. And also, power consumption can be lower. To verify the feasibility of the proposed system, force analysis and basic experim