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< 전시-P-66 > 슈퍼커패시터용 활성탄 생산을 위한 낙엽송 전처리 최적조건 탐색
최준호 ( Jun-ho Choi ),임건해 ( Geon Hae Lim ),노광철 ( Kwang Chul Roh ),이재원 ( Jae-won Lee ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
친환경에너지기술 개발 및 에너지저장기술에 대한 필요성으로 슈퍼커패시터의 에너지 효율 향상을 위한 전극소재 개발에 대한 관심이 집중되고 있다. 기존 슈퍼커패시터용 활성탄은 주로 야자각을 이용하지만 이는 원료 수급의 문제와 활성화에 대한 문제로 성능향상에 한계가 있다. 바이오매스 구성성분 중 리그닌은 탄화나 활성화 공정을 거쳐 많은 미세기공을 생성하여 높은 에너지 저장밀도를 가질 수 있어 이를 활용한 활성탄 개발을 기대하고 있다. 본 연구에서는 낙엽송을 이용하여 기존의 활성탄을 대체할 수 있는 바이오매스 기반의 활성탄 생산을 위한 전처리 최적조건을 탐색하고자 한다. 증류수를 사용한 무촉매 전처리는 170℃에서 10, 20, 40, 60분 조건으로 실시하였으며 분해율은 반응시간이 늘어남에 따라 17.46%에서 24.20%로 증가하였다. 촉매 전처리는 100 mM의 옥살산과 70 mM의 황산을 촉매로 이용하여 170 ℃ 10, 60분 조건으로 산 전처리를 수행하였다. 촉매 전처리 결과 옥살산은 27.48%에서 30.26%로 분해율이 증가하였으며, 황산은 29.47%에서 30.36%로 분해율이 증가하였다. 무촉매 전처리에 비해 촉매 전처리 이후 효소가수분해 당화수율이 증가하였으며, 전처리 이후 모든 조건에서 결정화도가 증가하였다. 전처리와 효소가수분해 이후 700℃ 탄화온도에서 탄소와 KOH비율이 1:2.5 일 때 활성탄 부피당 용량이 가장 큰 값을 나타냈다. 그 결과 무촉매 전처리의 비축전용량이 18 F/cc, 촉매 전처리는 모두 19 F/cc 로 촉매 전처리 조건에서 전극소재로 적합한 활성탄 특성을 나타냈다.
기관지 천식환자에서 기관지폐포 세척액의 세포조성에 관한 연구
이남민(Nam Min Lee),임건일(Geon Il Lim),박명재(Myeong Jea Park),김기업(Gi Uk Kim),어수택(Soo Taek Uh),정연태(Yeon Tae Chung),김용훈(Yong Hun Kim),박춘식(Choon Sik Park) 대한내과학회 1991 대한내과학회지 Vol.41 No.1
N/A Bronchial hypersensitivity is a characteristic finding in bronchial asthma, and increased bronchial responsive- ness to pharmacologic agents was found to be associated with increased inflammatory cells in bronchoalveolar lavage in asymptomatic or mild bronchial asthma. We measured the total and differential cell counts in 24 bronchial asthma patients (15 mild and 9 more than moderately severe), along with 15 normal controls using conventional 200 ml lavage to evaluate whether the cellular profiles of the lavage reflected the degree of symptoms or bronchial hyperactivity. The asthmatic patients had a significantly greater percentage of epithelial cells, neutrophils, and eosinophils in the lavage than did the normal groups; the PC 20 and FVC, FEV1 were well-correlated; and the neutrophil count had a statistically significant inverse correlation with physiologic parameters (FEV1, FVC). We conclude that bronchial asthma is accompanied by infiltration of the inflammatory cells into the bronchial tree, and these changes of inflammatory cells (especially neutrophils) can predict the severity of bronchial asthma, while the epithelial cell count reflects bronchial hypersensitivity inversely.
SIL 기반 플라즈모닉 리소그래피에서 주파수 적응형 필터를 이용 한 나노간극 제어의 성능향상
최국종 ( Guk Jong Choi ),임건 ( Geon Lim ),박노철 ( No Cheol Park ) 정보저장시스템학회 2014 정보저장시스템학회논문집 Vol.10 No.1
Plasmonic lithography is the latest technique to overcome diffraction limit of previous optical lithography. In the plasmonic lithography, the nano gap between nano metal wave guide and photoresist should be in sub-wavelength region. SIL-based plasmonic lithography is the one of the solutions to maintain small air gap. However, the nano gap control is so sensitive that a little disturbance is able to have a large effect on the nano gap control. So, we analyzed the characteristics of disturbance, and then modified the previous controller to suppress the disturbance. We applied two peak filters which were fixed one and adaptively changeable one. We experimentally confirmed the improvement of the nano gap control, which reduced nano gap error by 30 %. The proposed control will improve the quality of lithography pattern.
Super-continuum generation 현상을 이용한 Solid-immersion lens 기반 공초점 현미경
이원섭 ( Won Sup Lee ),문형배 ( Hyungbae Moon ),임건 ( Geon Lim ),최국종 ( Guk Jong Choi ),박노철 ( No Cheol Park ) 정보저장시스템학회 2015 정보저장시스템학회논문집 Vol.11 No.2
In this paper, we demonstrate solid-immersion lens based confocal microscopy using super-continuum generation effect. Using super-continuum generation effect, we could diversify the excitation wavelength of confocal microscopy. Further, high refractive index of solid-immersion lens would increase the resolution of confocal microscopy. As a result,by applying the super-continuum generation effect and solid-immersion lens to confocal microscopy, some problems of confocal fluorescent microscopy, the excitation wavelength and the resolution, could be overcome. To verify it, we made home-built solid-immersion lens based confocal microscopy using super-continuum generation effect, and evaluate the performance of the system.
정상인에서 전기 및 자기 자극을 이용한 설 근육의 전기생리학적 평가
조은미,류종현,안성환,조경원,임건한,김진호,김후원 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.1
Background: Abnormality of lingual muscles is clinically common. But its exact clinical assessment is quite difficult. Evaluation of motor power of the lingual muscles and their neural pathway is limited because of anatomical inaccessibility and individual variation of subjective symptoms. Transcranial magnetic stimulation (TMS) of the human motor cortex is a non-invasive tool to assess the functional integrity of the fast conducting central motor pathways and electrical stimulation of lingual nerve is a conventional method of peripheral nerve conduction. Therefore both study will be helpful to understanding of pathophysiology of lingual abnormality. Until now there is no such report in Korea. This study was conducted to acquire the easier method and normal control values of Korean subjects. Method: We recorded the motor responses from the lingual muscles of 32 healthy subjects (22 men, 10 women) by focal cortical TMS with a circular coil. Motor potentials were recorded by means of surface electrodes applied on the both side of the tongue, following TMS several centimeters lateral from the vertex and parietooccipital cortex and peripheral electrical stimulation of the 12th cranial nerve at the lateral 1/3 point of the line between the midline and angle of mandible. Results: During moderate motor activation, majority of maximal motor response were obtained 4-6cm lateral to the vertex with similar latencies. And the responses from magnetic stimulation of the intracranial segment of hypoglossal nerve were discarded because of difficulty to obtain and unsatisfactory reproducibility. The latency of motor evoked potentials in right cortical stimulation was 10.08 ± 1.17 msec and in left stimulation 10.04 ± 1.32 msec. The amplitudes in right 2.15 ± 1.02, left 2.09 ± 1.11 mV. The latencies electric hypoglossal nerve stimulation were 2.42 ± 0.34 in right, 2.49 ± 0.35 msec in left side. The amplitudes were 2.90 ± 2.37 in right, 2.43 ± 1.86 mV in left side. Central conduction times as calculated by subtracting the response latencies obtained by magnetic and electric stimulation are right 7.65 ± 1.19, left 7.55 ± 1.35 msec. There was no significant difference between man and woman, Conclusion: The method may be efficient, noninvasive, painless, and easy reproduced. With more extensive application to various neurological disorders, it comes close to being an ideal clinical conduction study technique for this cranial nerve.