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JaeHan Joo,Jae-Gwang Lee,SangWoo Kim,JaeHan Lee,June-Hee Lee,Kyung-Jae Lee 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
Background: We aimed to find the relationship between sleep duration and impaired fasting glucose according to working type in non-regular workers using the 2016 and 2017 Korean National Health And Nutrition Examination (KNHANE, 7th revision). Method: In the 1st and 2nd year (2016, 2017) of the 7th KNHANE, 16,277 people participated. Minors were excluded because this study was intended for individuals aged 19 years and older. As this study was based on wage workers, unemployment, self-employed workers, employers, unpaid family workers, and those who have insufficient answers such as unknown or no response were excluded. Regular workers were excluded because this study was intended for non-regular workers. Finally, a total of 2,168 people were included in the survey, except those who had been diagnosed with diabetes, had a fasting blood glucose level of 126 mg/dL or higher, or taking hypoglycemic agents or receiving insulin injections. To find the relationship between sleep duration and impaired fasting glucose according to work type in non-regular workers, multiple logistic regression analysis was performed by adjusting the general and occupational characteristics after stratification according to work type. All statistical analyses were performed using the SPSS software (version 26.0; SPSS Inc., Chicago, IL, USA). Results: In the case of insufficient sleep duration in irregular female workers, the odds ratio (OR) of impaired fasting glucose was statistically insignificant, but in the case of insufficient sleep duration in irregular male workers who have shift work, the odds ratio (OR) of impaired fasting glucose was significantly higher than that of sufficient sleep duration (Model 1, OR: 3.05, 95% confidence interval [CI]: 1.18–7.90; Model 2, OR: 2.81, 95% CI: 1.08–7.29). Conclusions: Our findings demonstrate that insufficient sleep duration was associated with an increase in fasting blood glucose levels in non-regular male workers working shifts. This means that non-regular workers are in desperate need for adequate sleep and health care. We hope that our study will help improve the health of non-regular workers and more systematic and prospective follow-up studies will be conducted to further improve the health of non-regular workers.
미세먼지로 인한 온실 피복재 투과율 저하 실험모델 개발
이종혁 ( Jonghyuk Lee ),정영준 ( Youngjoon Jeong ),이상익 ( Sangik Lee ),서병훈 ( Byunghun Seo ),김동수 ( Dongsu Kim ),홍은미 ( Eunmi Hong ),이승재 ( Seungjae Lee ),이재한 ( Jaehan Lee ),최원 ( Won Choi ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-
최근 국내외로 급속한 산업화로 인해 황사 및 미세먼지 발생 횟수가 증가하고 있으며, 이러한 미세먼지는 비닐온실의 투과율을 저하시켜 시설 작물의 생육 환경을 저해한다. 본 연구에서는 미세먼지 발생으로 인한 온실 피복재 투과율 저하도를 구명하고, 온습도 환경에 따른 미세먼지 흡착율을 평가하기 위해 축소실험모델을 개발하였다. 모델은 1개의 미세먼지 발생환경 재현 챔버와 미세먼지 발생장치, 온습도 및 미세먼지 측정 모니터링 센서를 포함한 컨트롤러로 구성되었다. 미세먼지 발생장치의 시료 투입구에 공압펌프를 활용하여 일정 간격으로 미세입자가 주입되며, 정량 투입을 위한 물리적 장치가 고안되었다. 또한 미세먼지 발생장치 내 싸이클론 발생기와 필터를 설치하여 챔버 내 미세먼지의 입경별 투입을 고려하였다. 미세먼지 시료는 입경 분포가 0.97 - 22.00 ㎛로 이루어진 Arizona test dust (A1 Ultrafine)을 사용하였으며, 온실 설계 시 가장 많이 활용되는 폴리에틸렌 (PE) 피복재를 대상으로 투과율 저하도를 분석하였다. 챔버내 온·습도 환경을 조절하며 미세먼지 흡착율에 따른 비닐시편의 투과율 저하도를 비교하였다.
Hybrid capacitive deionization to enhance the desalination performance of capacitive techniques
Lee, Jaehan,Kim, Seoni,Kim, Choonsoo,Yoon, Jeyong The Royal Society of Chemistry 2014 ENERGY AND ENVIRONMENTAL SCIENCE Vol.7 No.11
<P>Based on a porous carbon electrode, capacitive deionization (CDI) is a promising desalination technology in which ions are harvested and stored in an electrical double layer. However, the ion removal capacity of CDI systems is not sufficient for desalting high-concentration saline water. Here, we report a novel desalination technique referred to as “hybrid capacitive deionization (HCDI)”, which combines CDI with a battery system. HCDI consists of a sodium manganese oxide (Na<SUB>4</SUB>Mn<SUB>9</SUB>O<SUB>18</SUB>) electrode, an anion exchange membrane, and a porous carbon electrode. In this system, sodium ions are captured by the chemical reaction in the Na<SUB>4</SUB>Mn<SUB>9</SUB>O<SUB>18</SUB> electrode, whereas chloride ions are adsorbed on the surface of the activated carbon electrode during the desalination process. HCDI exhibited more than double the ion removal sorption capacity (31.2 mg g<SUP>−1</SUP>) than a typical CDI system (13.5 mg g<SUP>−1</SUP>). Moreover, it was found that the system has a rapid ion removal rate and excellent stability in an aqueous sodium chloride solution. These results thus suggest that the HCDI system could be a feasible method for desalting a highly concentrated sodium chloride solution in capacitive techniques.</P> <P>Graphic Abstract</P><P>Based on a porous carbon electrode, capacitive deionization (CDI) is a promising desalination technology in which ions are harvested and stored in an electrical double layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ee02378a'> </P>
Highly selective lithium recovery from brine using a λ-MnO<sub>2</sub>–Ag battery
Lee, Jaehan,Yu, Seung-Ho,Kim, Choonsoo,Sung, Yung-Eun,Yoon, Jeyong The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.20
<P>The demand for lithium has greatly increased with the rapid development of rechargeable batteries. Currently, the main lithium resource is brine lakes, but the conventional lithium recovery process is time consuming, inefficient, and environmentally harmful. Rechargeable batteries have been recently used for lithium recovery, and consist of lithium iron phosphate as a cathode. These batteries feature promising selectivity between lithium and sodium, but they suffer from severe interference from coexisting magnesium ions, an essential component of brine, which has prompted further study. This study reports on a highly selective and energy-efficient lithium recovery system using a rechargeable battery that consists of a λ-MnO<SUB>2</SUB> positive electrode and a chloride-capturing negative electrode. This system can be used to recover lithium from brine even in the presence of magnesium ions as well as other dissolved cations. In addition, lithium recovery from simulated brine is successfully demonstrated, consuming 1.0 W h per 1 mole of lithium recovered, using water similar to that from the artificial brine, which contains various cations (mole ratio: Na/Li ≈ 15.7, K/Li ≈ 2.2, Mg/Li ≈ 1.9).</P> <P>Graphic Abstract</P><P>The λ-MnO<SUB>2</SUB>–Ag battery successfully demonstrated lithium recovery in the presence of other cations including magnesium ions, with low energy consumption. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp50919b'> </P>
Lee, Jiho,Lee, Jaehan,Ahn, Jaewuk,Jo, Kyusik,Hong, Sung Pil,Kim, Choonsoo,Lee, Changha,Yoon, Jeyong American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.40
<P>Desalination technologies have heavily been investigated to utilize the abundant salt water on Earth due to the global freshwater shortage. During recent years, the desalination battery (DB) has attracted attention for its low-cost, eco-friendly, and energy-efficient characteristics. However, the current DB system is subject to inevitable performance degradation because of the mass-transfer limitation at the electrode-electrolyte interface, particularly when the system is used to treat brackish water. Here, we present a novel strategy to overcome the intrinsic mass-transfer limitation of DB in brackish water using an effective cell design based on a multichannel flow system. Compared to the conventional DB that consists of one feed channel, the multichannel desalination battery (MC-DB) is configured using two side channels introducing a highly concentrated solution to the electrodes and one middle feed channel for water desalination. The MC-DB showed a desalination capacity of 52.9 mg g<SUP>-1</SUP> and a maximum salt removal rate of 0.0576 mg g<SUP>-1</SUP> s<SUP>-1</SUP> (production rate of 42.3 g m<SUP>-2</SUP> h<SUP>-1</SUP>) when a salinity gradient between the feed streams in the middle (10 mM NaCl) and side (1000 mM NaCl) channels was present, which were 3-fold higher than those in the case with no salinity gradient. In addition, the high concentration solution in the side channel significantly enhanced the rate capability of MC-DB, allowing the system to operate under a high current density of 40 A m<SUP>-2</SUP> with a desalination capacity of 34.1 mg g<SUP>-1</SUP>. Considering the effect of electrolyte concentration on the battery electrode performance through electrochemical characterization, the highly saline medium at the side channel in the MC-DB creates an optimal environment for the battery electrode to fully capitalize the high desalination capacity, salt removal rate, and capacity retention of the battery electrodes.</P> [FIG OMISSION]</BR>
Direct evidence of void passivation in Cu(InGa)(SSe)<sub>2</sub> absorber layers
Lee, Dongho,Lee, Jaehan,Heo, Sung,Park, Jong-Bong,Kim, Young-Su,Mo, Chan B.,Huh, Kwangsoo,Yang, JungYup,Nam, Junggyu,Baek, Dohyun,Park, Sungchan,Kim, ByoungJune,Kim, Dongseop,Kang, Yoonmook American Institute of Physics 2015 Applied Physics Letters Vol.106 No.8
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>