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ASSESSING SPATIALLY VARYING MARKETPLACE INCLUSION: AN INVESTIGATION OF GROCERY STORES
Seongsoo Jang,Jinwon Kim 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
This study assessed the degree of marketplace inclusion inherent in the distribution of grocery stores in the Detroit Metropolitan Area; to account for spatial effects such as spatial heterogeneity, phenomena rarely considered in prior marketing literature, geographically weighted regression and geographic information systems were employed.
Tangible interface for shape modeling by block assembly of wirelessly connected blocks
Jinwon Son,Hoik Jang,Young Choi 한국CDE학회 2019 Journal of computational design and engineering Vol.6 No.4
Tangible computer-aided design (CAD) that can generate and manipulate 3D models more efficiently than conventional modeling interfaces is a new interface technology between users and computers through tangible physical devices. Because the majority of tangible CAD systems use cameras or projec-tors, 3D models of complex structures with visual occlusion cannot be generated. In this work, we pro-pose and develop a system that allows users to create complex shapes by assembling wireless blocks. By allowing more freedom in the orientations of blocks, models created by the assembly operation can be used to generate true 3D shapes compared to the 2.5D shapes resulting from previous research. The phys-ical blocks of the proposed system include infrared proximity sensors, inertial magnetic units, Zigbee modules, and Arduino microcontrollers. The status of the block assembly is transmitted to the worksta-tion wirelessly by the Zigbee. The workstation collects the sensor data of the blocks and generates and renders 3D models of the physically assembled blocks. The concept of the proposed tangible CAD system can be used in various application areas where simple, easy-to-use shape modeling interfaces for creating models by assembling small blocks are sufficient. The education and gaming industries are good exam-ples of where this concept can be applied easily.
Targeted drug delivery technology using untethered microrobots: a review
Jang, Deasung,Jeong, Jinwon,Song, Hyeonseok,Chung, Sang Kug IOP 2019 Journal of micromechanics and microengineering Vol.29 No.5
<P>Targeted drug delivery is a promising application of microrobots owing to the capability of the microrobots to access nearly every region of the human body through the circulatory system. Research on microrobots over the past few decades has enabled substantial advances in the design of both the untethered microrobots swimming in a biofluid and the related mechanisms to carry and release therapeutic agents in a controlled manner. This paper presents a comprehensive review of the technological state of the art in untethered microrobots for targeted drug delivery applications. First, the <I>in vivo</I> microrobot locomotion techniques are discussed with respect of the different types of actuation energy sources such as magnetic fields, motile microorganisms, acoustic waves, and chemical reaction, outlining the respective advantages and major limitations. Subsequently, recent progress in various technologies of microrobot-driven targeted drug delivery is surveyed deliberating on the corresponding drug manipulation mechanisms: magnetically driven, motile microorganisms-driven, acoustic-aided, and stimuli-responsive hydrogels-aided. Although most studies on microrobot-driven targeted drug delivery were carried out <I>in vitro</I>, few among them successfully demonstrated <I>in vivo</I> operations in living animals. In the concluding section, current challenges and future perspectives of the microrobot-driven targeted drug delivery technology are discussed.</P>
( Kyumin Jang ),( Dongwook Lee ),( Won Yong Choi ),( Yunsung Yoo ),( Jinwon Park ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
This study investigated the technical feasibility of a novel extraction-mineralization process using cement kiln dust and in-situ strong acid. The process included the extraction of Ca(OH)<sub>2</sub> from cement kiln dust (CKD) using strong acids and mineralization for CO<sub>2</sub> absorption employing extracted Ca(OH)<sub>2</sub> and alkaline wastewater as solvents. The extraction process used the pH swing method comprised of three phases: Ca<sup>2+</sup> leaching from the CKD, removal of impurities from the supernatant, and Ca<sup>2+</sup> recovery. hydrochloric acid, and nitric acid, showed significant Ca<sup>2+</sup> extraction efficiency of 93.54% and 88.58%, respectively. In the mineralization phase, when the Ca(OH)<sub>2</sub> was used with deionized water as a solvent, they have shown similar CO<sub>2</sub> loading values (1.19 and 1.18 mol CO<sub>2</sub>/mol Ca(OH)<sub>2</sub> with hydrochloric acid and nitric acid as extraction agents, respectively). When the solvent was replaced with alkaline wastewater, the CO<sub>2</sub> loading values were increased to 2.28 and 2.26 mol CO<sub>2</sub>/mol Ca(OH)<sub>2</sub> with hydrochloric acid and nitric acid as extraction agents, respectively. In the proposed process, CaCO<sub>3</sub> yield was achieved at 126.45 and 71.17 g CaCO<sub>3</sub>/kg CKD with hydrochloric acid and nitric acid, respectively. In addition, the properties of CaCO<sub>3</sub> were different depending on solvent types and it was observed that nanosized CaCO<sub>3</sub> with 41.21 and 30.85 nm of average particle size was formed with deionized water as a solvent. When the solvent was replaced, the average particle size of CaCO<sub>3</sub> increased to 62.87 and 43.05 nm, respectively. As a result, it seems that the high pH of alkaline wastewater affected the increase of particle size because the nucleation and the growth of CaCO<sub>3</sub> are highly dependent on the pH of the system. The novel extraction-mineralization process takes advantage of no additional energy and no generation of acidic or alkaline wastewater in the overall process, and high-purity CaCO<sub>3</sub> products. Therefore, this novel extraction-mineralization process allows approximately 0.71 to 1.46 ton of CO<sub>2</sub> to be captured using 1 ton of CKD. Via substituting conventional products of CaCO<sub>3</sub>, this process could reduce more than original CO<sub>2e</sub> emissions. Therefore, the results of this study can be contributed to carbon capture and utilization processes designed for industry by-products such as alkaline waste.
장규민 ( Kyumin Jang ),강동우 ( Dongwoo Kang ),유윤성 ( Yunsung Yoo ),김인준 ( Injun Kim ),최원용 ( Wonyong Choi ),박진원 ( Jinwon Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2020 No.-
LFG가스에는 메탄과 이산화탄소가 50%, 30%가 포함되어 있다. 본 연구에서는 LFG가스 내의 이산화탄소를 흡수 후 ash에서 추출한 Ca(OH)<sub>2</sub>를 첨가해 전환실험을 하였다. 대표적인 흡수제인 Monoethanolamine을 사용하여 이산화탄소를 흡수시켜, 흡수곡선을 도시하였다. Gas Chromatography(GC)분석을 통해 흡수된 가스의 순도를 확인하였다. ash를 채취하여, inductively coupled plasma optical emission spectrometry(ICP-OES)분석, X-ray fluorescence(XRF)분석, X Ray Diffraction(XRD)분석을 통해 Ca의 함량을 확인하였다. 추출 용제로 hydrochloric acid 40%를 사용하였으며, pH를 11와 13으로 조절하기 위해 NaOH를 주입한 결과로 불순물과 Ca(OH)<sub>2</sub>가 침전되었다. 침전물에 대하여 XRD분석을 하여 침전물이 Calcium hydroxide임을 확인하였다. 포화된 흡수제에 Calcium hydroxide를 첨가하여 흡수제를 재생시켰다.
LFG 고순도화 및 플라이 애쉬 내 칼슘 이온을 통한 CO<sub>2</sub> 활용
장규민 ( Kyumin Jang ),유윤성 ( Yunsung Yoo ),이동욱 ( Dongwook Lee ),최원용 ( Won Yong Choi ),( Cristian Aravena ),김인준 ( Injun Kim ),박진원 ( Jinwon Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
본 연구는 MEA를 이용한 Landfill gas(LFG) CCUS 프로세스와 Municipal Solid Waste Incineration(MSWI) fly ash에서 추출한 Ca 이온을 활용하여 포화 된 Monoethanolamine(MEA)의 재생에 대한 연구를 하였다. LFG는 유기 폐기물의 혐기성 소화에 의해 생성된 혼합물로, 주로 CO<sub>2</sub> (30-50 vol.%)와 CH<sub>4</sub> (40-60 vol.%)를 함유하고 있다. LFG에 CO<sub>2</sub>가 존재하면 열량이 감소하기 때문에, CO<sub>2</sub>의 제거를 통해 양질의 메탄가스를 생산하고자 한다. Carbon Capture Utilization and Storage(CCUS)는 배가스로부터 CO<sub>2</sub>를 선택적으로 포집 후 이를 저장 및 유용 물질로 활용하는 기술이다. 일반적으로 MEA는 CO<sub>2</sub>와의 반응에서 높은 흡수 용량과 반응속도로 인해 사용되는 상용 흡수제지만 재생에 다량의 에너지가 소모되는 단점이 있다. 이에 따라 광물 탄산화를 활용하여 포화된 MEA를 추가적인 에너지 소모 없이 재생하였다. 광물 탄산화의 원료 물질은 고형 폐기물 소각에서 발생하는 MSWI fly ash를 선정하였으며 3단계로 구성된 pH-swing method를 통해 Ca를 추출하였다. 추출 용제로 1N-citric acid, acetic acid, formic acid가 사용되었으며 칼슘 이온 회수율은 각각 82.82 %, 98.35 %, 97.99 %를 달성하였다. 이후 LFG 내 CO<sub>2</sub>를 제거하기 위해 흡수실험을 진행하였으며 시간 별 CH<sub>4</sub>-CO<sub>2</sub> 농도 곡선을 도시하였다. 포화 된 흡수제의 재생을 위하여 fly ash에서 추출한 Ca를 첨가하여 흡수제를 재생하였으며 침전된 침전물은 여과 후 회수하였다. pH-swing method에서 발생한 상등액과 침전물에 대하여 Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) 분석, X-Ray Diffraction (XRD), Scanning Electron Microscope(SEM) 분석을 통해 구성성분의 농도 및 최종 Ca 이온의 형태를 확인하였다.