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Review of concepts and applications of electrochemical ion separation (EIONS) process
Yoon, Hansun,Lee, Jiho,Kim, Seoni,Yoon, Jeyong Elsevier 2019 Separation and purification technology Vol.215 No.-
<P><B>Abstract</B></P> <P>Sustainability has become a global issue that arouses the need for efficient allocation of resources such as water and energy. Over the recent decade, vast research activities were conducted to electrochemical processes, which utilize fundamentals of electrochemistry to achieve ion separation. Owing to its facile, energy-efficient, and environmentally benign characteristics, electrochemical processes are widely applied to various industries such as desalination, and resource recovery to separate ions either non-selectively or selectively. Although electrochemical processes have been designed for different target ions and industrial purposes, they have in common that ions are captured and released by electrodes sharing similar fundamental separation principles. In this review, electrochemical ion separation (EIONS) was proposed to encompass electrochemical processes utilized in various applications. The concept of EIONS is established in detail through chemical process classification. In addition, the state-of-art of EIONS in desalination, resource recovery, impurity removal, and control of hardness and nutritive ions are provided as example applications. Furthermore, perspectives on the development and potential expansion of EIONS application are provided.</P> <P><B>Highlights</B></P> <P> <UL> <LI> EIONS is conceptualized based on chemical process classification. </LI> <LI> Operating principles is explained based on Faradaic and non-Faradaic reactions. </LI> <LI> State of the art of EIONS applications are presented. </LI> <LI> Future perspectives on the development of EIONS are provided. </LI> </UL> </P>
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Jiho Yoon,Yong Sang Lee,Hang-Seok Chang,Cheong Soo Park 대한외과학회 2014 Annals of Surgical Treatment and Research(ASRT) Vol.87 No.3
Purpose: Endometriosis is defined as functioning endometrial tissue outside of the uterus. Endometriosis of the appendix is uncommon. Its clinical presentation varies from asymptomatic to acute abdominal pain. The aims of this study were to describe our experience of managing patients with appendiceal endometriosis and to review the clinical characteristics of this medical condition. Methods: Five cases of appendiceal endometriosis diagnosed between January 2007 and December 2012 were retrospectively reviewed. Patients treated for intra-abdominal endometriosis were excluded. Results: The mean age at diagnosis was 33.8 years old. One patient was in the second trimester of pregnancy. Two patients were asymptomatic. Three patients had clinical symptoms including two with acute pain in the right lower quadrant and one with abdominal discomfort. Four patients showed appendiceal abnormalities in imaging studies including two cases of suspected mucocele and two cases of appendiceal infection. There were no suspicions of endometriosis of the appendix based on preoperative imaging studies. Three patients underwent appendectomy due to clinical symptoms, and two underwent incidental appendectomy combined with another operation. None of the patients received adjuvant therapy. Conclusion: Appendiceal endometriosis should be included in the differential diagnosis for acute abdominal pain, especially when women of childbearing age present with clinical symptoms of acute appendicitis.
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Yoon, Jiho,Kang, Kyungnam,Kim, Sungchul,Kim, Jungho Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.4
<P><B>Abstract</B></P> <P>We numerically investigate the effect of the incidence angle of sunlight on the optimized folding angle of V-shaped organic solar cells (VOSCs) to obtain the best power conversion efficiency in a realistically operating environment. The light absorbance at the active layer is calculated based on the finite element method with respect to the incidence angle of sunlight and the folding angle of the VOSC. We calculate the generation energy density per day at each folding angle by integrating the angular response of the short-circuit current and the open-circuit voltage with the consideration of the variation of the incidence angle during daytime. We show that the optimized folding angle of the VOSC based on the variation of the generation energy density per day is close to that determined from the variation of the electric power density in normal incidence, which has been widely used to optimize the folding angle of VOSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> V-shaped organic solar cells (VOSCs) were optically modeled based on the FEM. </LI> <LI> Angular response of VOSCs was calculated during daytime. </LI> <LI> The energy density per day was used to optimize the folding angle of VOSCs. </LI> </UL> </P>
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Son, Yoon Jun,Kang, Jin Soo,Yoon, Jungjin,Kim, Jin,Jeong, Juwon,Kang, Jiho,Lee, Myeong Jae,Park, Hyun S.,Sung, Yung-Eun American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.13
<P>Dye-sensitized solar cells (DSSCs) are highly efficient and reliable photovoltaic devices that are based on nanostructured semiconductor photoelectrodes. From their inception in 1991, colloidal TiO<SUB>2</SUB> nanoparticles (NPs) with the large surface area have manifested the highest performances and the particle size of around 20 nm is generally regarded as the optimized condition. However, though there have been reports on the influences of particle sizes in conventional DSSCs employing iodide redox electrolyte, the size effects in DSSCs with the state-of-the-art cobalt electrolyte have not been investigated. In this research, systematic analyses on DSSCs with cobalt electrolytes are carried out by using various sizes of NPs (20-30 nm), and the highest performance is obtained in the case of 30 nm sized TiO<SUB>2</SUB> NPs, indicating that there is a reversed power conversion efficiency trend when compared with those with the iodide counterpart. Detailed investigations on various factors-light harvesting, charge injection, dye regeneration, and charge collection-reveal that TiO<SUB>2</SUB> particles with a size range of 20-30 nm do not have a notable difference in charge injection, dye regeneration, and even in light-harvesting efficiency. It is experimentally verified that the superior charge collection property is the sole origin of the higher performance, suggesting that charge collection should be prioritized for designing nanostructured TiO<SUB>2</SUB> photoelectrodes for DSSCs employing cobalt redox electrolytes.</P> [FIG OMISSION]</BR>
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Extraction of Salinity-Gradient Energy by a Hybrid Capacitive-Mixing System
Lee, Jiho,Yoon, Hongsik,Lee, Jaehan,Kim, Taeyoung,Yoon, Jeyong Wiley (John WileySons) 2017 ChemSusChem Vol.10 No.7
<P>Salinity-gradient energy (SGE) is a renewable energy source available wherever two solutions with different salinity mix. Capacitive-mixing (Capmix) is a technology that directly extracts the SG potential through the movements of ions in high- and low-concentration solutions. However, the energy-harvesting performance of Capmix needs further improvement. Herein, a hybrid Capmix that consists of a battery and capacitive electrodes is proposed. In this system, sodium ions and anions are captured/released by the metal oxide and carbon electrodes, respectively. The hybrid Capmix extracted an energy density that was approximately three times higher (130Jm(-2)) and exhibited a notable power output (97mWm(-2)) compared to the previous Capmix using ion-exchange membranes. Furthermore, the hybrid system operated successfully with real river water and seawater. These results suggest that the hybrid Capmix could be a viable option to harvest energy from salinity gradients.</P>
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( Sang Hoon Ahn ),( Won Hyeok Choe ),( Yoon Jun Kim ),( Jeong Heo ),( Dorota Latarska-smuga ),( Jiho Kang ),( Seung Woon Paik ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Chronic Hepatitis C Virus (HCV) infection increases the risk for progressive liver disease, hepatocellular carcinoma and negatively impacts the patient’s quality of life. HCV treatment is evolving with direct acting antivirals but IFN based therapy has been the standard of care for many years and remains available in some countries. The MOSAIC study aims to characterize patients with chronic HCV infection and assess the impact of IFN-containing treatment on health-related quality of life, work related productivity and health care utilization. Methods: MOSAIC is an international prospective multicenter observational study that has been conducted in 20 countries. Consecutive patients with chronic HCV infection were enrolled and those who initiated an IFN based regimen were prospectively followed for 48 weeks. We report results from the Korean cohort Results: 100 patients were enrolled: 86 were treatment naïve and 14 were treatment experienced. 33 patients initiated an IFN based regimen: 6 patients started IFN + RBV, 26 patients started Peg-IFN + RBV, none started Peg-IFN + RBV + DAA and 1 patient received other treatment. Among the treated cohort, demographic and disease characteristics were the following: the mean age was 54.5 years; 14 patients were male. 14 had minimal or no fibrosis, 2 portal fibrosis, 3 bridging fibrosis and 6 patients suffered from cirrhosis. HCV Genotype distribution was as follows: genotype 1: 11; genotype 2: 19 and genotype 3: 3. Table 1 describes the results at baseline and changes over 4, 12 and 48 weeks and end-of-treatment (EOT) for the quality of life and work productivity outcome measures (EQ-5D-5L, HCV-PRO and WPAI). Conclusions: Results from the Korean cohort of the MOSAIC study show a moderate trend for deterioration of health-related quality of life and work productivity associated with IFN based treatment for patients with chronic HCV infection during treatment period. Acknowledgements: The design, study conduct, analysis, and financial support of MOSAIC study were provided by AbbVie. AbbVie participated in the interpretation of data, review, and approval of the content of the abstract. All authors had access to all relevant data and participated in writing, review, and approval of this abstract. Medical writing support was provided by Olivier Van de Steen of Medeor-consulting, funded by AbbVie. Disclosures: Sang Hoon Ahn: served as an advisor and lecturer for Bristol-Myers Squibb, Gilead Sciences, F.Hoffmann-La Roche, Merck, AbbVie, and has received unrestricted grants from Bristol-Myers Squibb, Gilead Sciences, and F. Hoffmann-La Roche for investigator- initiated trials Won Hyeok Choe: Nothing to disclosure Yoon Jun Kim: Nothing to disclosure Jeong Heo: received a grant from GSK; Research support from BMS, and Roche; Advisor for Abbvie, BMS, Gilead Sciences, Pharma Essentia, SillaJen, and Johnson & Johnson. Dorota Latarska-Smuga, Jiho Kang: are employees of AbbVie, Inc. and may hold stock or stock options. Seung Woon Paik: received grant and research support from AbbVie, BMS, Gilead, GSK, Merck, Novartis, and Roche
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Jeyull Lee,Junseong Kim,Jinsub Kim,Young Gun Park,Woo Seung Lee,Jiho Lee,Yoon Do Chung,Kyung-yong Yoon,Ho Min Kim,Yong Soo Yoon,Tae Kuk Ko Institute of Electrical and Electronics Engineers 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>In this paper, characteristics of a thermally and magnetically triggered switch for a high-Tc superconducting (HTS) power converting system are experimentally analyzed. For verifying the efficiency of the suggested switch, current charging and discharging tests using heater-triggered switch with or without an external magnetic field are performed. Charging tests are performed with two charging sequences, i.e., CS1 and CS2. Each sequence is experimented with two kinds of heater currents to maintain different temperatures. Saturation current and saturation time are detected to calculate the pumping rate. Two discharging sequences, i.e., DS1 and DS2, are used for discharging tests with heater current to maintain 120 K. From the results, normalized load energies are calculated and compared.</P>
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Yoon, Yong Pill,Ryu, Jiho,Park, Su Hyun,Lee, Hyun Jae,Lee, Seungho,Lee, Sang Kook,Kim, Ju-Ock,Hong, Jang-Hee,Seok, Jeong Ho,Lee, Choong Jae The Korean Academy of Tuberculosis and Respiratory 2014 Tuberculosis and Respiratory Diseases Vol.77 No.5
Background: In this study, we investigated whether lobetyolin, lobetyol, and methyl linoleate derived from Codonopsis pilosula affect MUC5AC mucin secretion, production, and gene expression from airway epithelial cells. Methods: Confluent NCI-H292 cells were pretreated with lobetyolin, lobetyol, or methyl linoleate for 30 minutes and then stimulated with phorbol 12-myristate 13-acetate (PMA) for 24 hours. The MUC5AC mucin gene expression, and mucin protein production and secretion were measured by reverse transcription polymerase chain reaction and enzyme-linked immunosorbent assay, respectively. Results: Lobetyolin, lobetyol, and methyl linoleate inhibited the gene expression of MUC5AC mucin induced by PMA; lobetyolin did not affect PMA-induced MUC5AC mucin production. However, lobetyol and methyl linoleate inhibited the production of MUC5AC mucin; lobetyolin and lobetyol did not significantly affect PMA-induced MUC5AC mucin secretion from NCI-H292 cells. However, methyl linoleate decreased the MUC5AC mucin secretion. Conclusion: These results suggest that among the three compounds, methyl linoleate can regulate gene expression, production, and secretion of MUC5AC mucin by directly acting on the airway epithelial cells.
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