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( Junghyun Kim ),( Woo Jin Kim ),( Bom Kim ),( So Hyeon Bak ),( Yeon-mok Oh ) 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Purpose The clinical and radiological presentation of chronic obstructive pulmonary disease (COPD) has proposed heterogeneity according to the sources of inflammation characterized in COPD. This study tried to evaluate COPD phenotypes for specific dust exposure. Method This study was designed to compare characteristics and clinical outcomes with radiological findings between the two prospective COPD cohorts representing a distinguishing region in the Korea; COPD in Dusty Area (CODA) and the Korean Obstructive Lung Disease (KOLD) cohort. A total of 733 participants (n=186 for CODA, and n=547 for KOLD, for each) were included in the final analysis. Multivariate analysis for the comparison of lung function and CT measurements of both study groups after adjusting for age, gender, education, body mass index, smoking status, pack-year, charlson comorbity index, and the frequency of exacerbation were done entering the level of FEV1(%), biomass exposure and COPD medication into the model in stepwise. Result There was no differences in mean wall area (70.2±1.26 in CODA vs. 67.07±0.90 in KOLD, p=0.121). KOLD, where the COPD subjects from urban and metropolitan area, showed higher emphysema index (6.07±3.06 in CODA vs. 20.0±2.21 in KOLD, p<0.001, respectively). This significance in emphysema index was consistent even after further adjustment for FEV1 (6.12±2.88 in CODA vs. 17.3±2.10 in KOLD, p=0.002, respectively). Mean wall area was also found to be significantly lower in KOLD (70.2±1.21 in CODA vs. 66.8±0.88 in KOLD, p=0.028) after including FEV1 into the model. However, there was no difference in lung density between the two groups (p=0.077). Additional adjustment for biomass parameter and medication for COPD did not alter the statistical significance after entering into the analysis with COPD medication. Conclusion Higher mean wall area and lower emphysema index were observed in dust exposure region. These Results suggest that imaging phenotype of COPD is influenced by the environmental exposure.
Junghyun Kim,Soo Jie Chung,Woo Jin Kim 대한내과학회 2024 The Korean Journal of Internal Medicine Vol.39 No.1
A high level of particulate matter (PM) in air is correlated with the onset and development of chronic respiratory diseases. We conducted a systematic literature review, searching the MEDLINE, EMBASE, and Cochrane databases for studies of biomarkers of the effect of PM exposure on chronic respiratory diseases and the progression thereof. Thirty-eight articles on biomarkers of the progression of chronic respiratory diseases after exposure to PM were identified, four of which were eligible for review. Serum, sputum, urine, and exhaled breath condensate biomarkers of the effect of PM exposure on chronic obstructive pulmonary disease (COPD) and asthma had a variety of underlying mechanisms. We summarized the functions of biomarkers linked to COPD and asthma and their biological plausibility. We identified few biomarkers of PM exposure-related progression of chronic respiratory diseases. The included studies were restricted to those on biomarkers of the relationship of PM exposure with the progression of chronic respiratory diseases. The predictive power of biomarkers of the effect of PM exposure on chronic respiratory diseases varies according to the functions of the biomarkers.
PVDF 와 실리콘 산화물을 이용한 2 차전지 음극재용 다공성 복합입자 제조
김정현(Junghyun Kim),정진수(Jin-Su Jung),이정한(Jeonghan Lee),이교우(Gyo Woo Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
본 연구는 실리콘 잉곳 생산장비에서 응축되어 생성된 흄 형태의 실리콘 산화물을 2차전지의 음극재로 재활용 한 연구로 포집한 입자를 PVDF(polyvinylidene fluoride)의 식각효과를 이용하여 다공성 복합입자로 제조해 음극재로의 성능을 개선하고자 했다. 실리콘 산화물을 다공성 복합입자로 개질하기 위해 PVDF와 혼합 후 열처리하여 PVDF에서 불소가 발생하도록 했으며 PVDF에 포함된 탄소와 실리콘 산화물이 복합입자로 제조되게 했다. 이와 함께 PVDF의 식각 효과를 확인하기 위해 SiO2와 PVDF를 같은 방법으로 혼합 후 열처리하여 복합입자를 제조했다. 이후 XPS(x-ray photoelectron spectroscopy), STEM(scanning transmission electron microscopy), TEM(transmission electron microscopy), EDS(energy dispersive x-ray spectroscopy) 분석하여 입자의 특성을 비교했고, 실리콘 산화물의 개질 전 후의 입자를 이용해 half coin cell을 제조해 charge/discharge, EIS(electrochemical impedance spectroscopy) 테스트를 수행하여 방전용량과 용량유지율 및 전극의 저항을 비교했다. 입자의 개질을 통해 다공성 복합입자가 제조된 것을 STEM 사진으로 관찰했고 이는 PVDF의 식각효과의 결과이며, 이를 SiO₂를 같은 개질 방법으로 제조한 입자를 분석해 확인했다. 또한, 150회 충방전 테스트에서 용량 유지율은 입자 개질 전 33.4 %에서 입자 개질 후 55.6 %로 개선되었고, 전기 저항의 크기를 나타내는 반원의 크기가 개질 후 작아져 전기 전도성이 향상된 것을 볼 수 있었다. 이는 탄소 코팅에 의한 실리콘 팽창 저지 효과로 방전용량 유지율이 상승한 것이며, 다공성 입자 구조로 인한 비표면적 증대로 전해액과 리튬 이온의 접촉 면적이 증가하고 전기 전도성이 높은 탄소에 의해 전기 저항이 작아진 것이다. 결과적으로 본 연구를 통해 실리콘 산화물을 PVDF를 이용해 다공성 구조의 복합입자로 제조할 수 있음을 확인했고 이 방법은 음극재로의 성능개선을 위한 방법 중 하나로 제안될 수 있다. 차후 연구에서는 PVDF와 실리콘 산화물의 혼합비에 따른 음극재 성능 변화를 살펴보고 최적화할 예정이다.
Small Electrical Nerve Stimulator by Arm Processor
Sanghyo Woo,Changwook Kim,Mohyuddin Zia,Sangheon Lee,Euisung Chung,Jangwoo Lee,Junghyun Lee,Heejoon Park,Chulho Won,Jinho Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Recently, performance of a mobile phone has increased dramatically, and it is possible to integrate various biotechnologies into the mobile phone. Among the various biotechnologies, a transcutaneous electrical nerve stimulator has many advantages such as improve the circulation of blood and suppress a pain. To integrate the stimulator in the mobile phone, it is necessity to make small, low power, and safe module. In this paper, the transcutaneous electrical nerve stimulation module was designed and implemented by small boost converter. To reduce the power consumption, the external ADC was used to measure the value of the charged energy. Also, the module limits the maximum transmit power by tank capacitor value to inprove safety. To confirm the operation of designed module, an arm processor was used to control the module. The implemented module consumes only 6.6 ㎽ (without CPU) at normal stimulus mode.