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이성민,김봉석,송준호,이수훈,이혜진,이문구,송준엽,이창우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
Recently, the robustness against daily impact is important according to portablization and downsizing of mobile electronics. Especially, almost parts of cellular phone should undergo drop test when they fall 1.5 m above ground. This test simulates the case when cellular phone slips through user's fingers while he is talking on the phone. This paper studies a drop test of auto focusing (AF) actuator for camera module in cellular phone. This component is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension. The leaf spring's deformation is essential for the test because its permanent distortion disables the focusing, and then, a high quality photograph cannot be obtained. Up to now the drop test has been carried out after fabricating real AF actuator. We propose a dropt test model which simulates the drop test based on finite element analysis. This model makes us enable investigate the stress acting on the clamping and curved parts of leaf spring. Stress over Von Mises criterion lets the spring deformed permanently, and then AF actuator malfunctioned, It helps us to design and modify AF actuator without manufacturing the real product. And also, it saves the time and cost for the development of new products.
Novel Methylation Biomarker for Non-invasive Diagnostics in Lung Cancer
오태정,( Chang Hun Lee2 ),( Min Ki Lee ),( Yeul Hong Kim ),( Sang Yull Lee ),( Hyo Sung Jeon ),( Shin Yup Lee ),( Seung Soo Yoo ),( Jae Yong Park ),( Sung Whan An ) 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.-
To identify aberrantly hypermethylated DNA in lung cancer cells we established a genome-wide analysis for hypermethylation sites, namely Methyl DNA Isolation and Amplification (MeDIA) coupled-CpG microarray analysis. In the comprehensive methyaltion profiling analysis between human lung cancer, A549 cells and normal NHBE cells, we observed that several clusters of genes show a significant level of aberrancy in CpG island methylation pattern in cancer cells compared to normal cells. We further identified PCDHGA12 gene as a new marker of non-invasive diagnostics for lung cancer based on followings. 1) Transcription of PCDHGA12 gene is reactivated after treatment of A549 cells with demethylating agent. 2) Bisulfide clonal-sequencing reveals that CpG island of PCDHGA12 shows a distinctive differential methylation between two cell lines. 3) Pyrosequencing-based quantitative methylation assay for such region in tumor and non-tumorous tissues from lung cancer patients shows aberrant hypermethylation in 37 (92%) of the 40 tumor tissues. In clinical validation by pyrosequencingin induced-sputum of lung cancer patients (n=87) and healthy controls (n=51), we observed aberrant hypermethylation incident at significantly elevated level in samples derived from lung cancer patients. According to the optimal threshold calculated by ROC curve analysis, sensitivity and specificity of PCDHGA12 was 86.2% and 82.4%, respectively. PCDHGA12 methylation status could be a potential methylation biomarker alone or combined with others for the screen and the detection of relapse of lung cancer.
매크로/마이크로 레벨 볼트 결합 구조물에서의 실험적/해석적 방법을 통한 시스템 특성 비교
김봉석,이성민,이문구,이수훈,Jun Ni,송준엽,이창우,하태호 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
As the micro technology and miniaturization of a structure and component in the last couple of decades have been concretely realized, the understanding of structural and dynamic characteristics and prediction of dynamic behavior are indispensable to the miniaturized structures and micro machines. This paper shows the effect of dynamic characteristics in bolt-jointed structures by comparing natural frequencies and mode shapes between macro and micro-scale beams through experimental modal analysis and finite element analysis with a1 8 test models by materials, by size, and by joining condition; that is, SS41 and A16061-T651, micro and macro, and monolithic beam and bolt-jointed beam.
Plant regeneration from callus of Iris odaesanensis Y. N. Lee native to Korea via organogenesis
Bae, Kee-Hwa,Yoo, Kyoung-Hwa,Lee, Mi-Hyun,Jeong, Jae-Hun,Choi, Yong-Eui,Yoon, Eui-Soo The Korean Society of Plant Biotechnology 2013 식물생명공학회지 Vol.40 No.3
Iris odaesanensis Y. N. Lee. is an important endangered and native plant belonging to the family Iridaceae in Korea. This study describes a method for rapid micropropagation of this species via from leaf, rhizome and root explants derived calli. Leaf, rhizome and root explants were cultured on Murashige and Skoog (MS) medium supplemented with 2,4-dichlorophenoxy acetic acid (2,4-D) for callus induction. Rhizome explants yielded calli at a frequency of 72% when cultured at 1.0 mg/l 2,4-D. Calli were maintained at 1.0 mg/l 2,4-D. These calli were transferred to MS medium supplemented with 0, 0.5, 1.0, and 2.0 mg/l 2,4-D in combination with 0, 0.5, 1.0, and 3.0 mg/l BA for adventitious shoot induction. The highest number of adventitious shoot (228.9 per petri-dish) were formed at 1.0 mg/l 2,4-D and 1.0 mg/l BA. WPM medium was the best to convert calli into plantlets, where up to 98.2% of calli were regenerated into plantlets. This in vitro propagation protocol should be useful for conservation of this endangered plant.
李秀培,金德宗,金康柱,田炳勳,禹元洪 圓光大學校 韓醫學硏究所 1993 원광한의학 Vol.3 No.1
The purpose of this study is to know the effects of Pinelliae Tuber on the cytotoxicity of human gingival fibroblasts according to brewing methods. Pinelliae Tuber was extracted by water in the state of being raw materials, prebrewing with Zingiberis Tuber and alumen. The extracted Pinelliae Tuber was applied to the cultured human gingival fibroblasts. The cytotoxic effct of Pinelliae Tuber was meaeured by MTTassay and microscopic findings. The results were as follows : 1. The cell viability of the fibroblasts by Pinelliae Tuber water extracts significantly decreased compared to control group. 2. The cell viability by the Pinelliae Tuber extracts prebrewed with Zingiberis Tuber was similiar to those of control group. 3. The cell viability by the Pinelliae Tuber extracts prebrewed with alumen slightly decreased, but was higher than those of PT group. 4. According to the microscopec findings, the number of cell count were smaller than normal in all experimental group, specially in the PT group, and showed the shrinkage of cytoplasmic process in the PT group and PA group.
이명수,허화정,김병기,류훈,정현택 한국정신과학학회 1998 韓國精神科學學會誌 Vol.2 No.2
심장박동간격은 최근 교감신경과 부교감신경의 안정을 알아보는 척도로 쓰이고 있다. 본 연구는 4~12개월 천도선법 기수련을 행한 20대의 20명의 기수련자와 동일 연령층의 20명의 일반인을 대상으로 하여 1시간 동안 천도선법을 수행하게 하여 전, 참선, 후의 심장박동을 생리 기록계로 측정을 하여 빠른 퓨리에 변환 (FFT)을 통하여 심장박동간격을 조사하였다. 그 결과 자율신경제의 안정척도인 저주파수 적분 값과 고주파수 적분 값의 비(LF/HF)가 수련전과 수련 중에서 천도선법 기수련생들의 값이 일반인과 비교하여 통계적으로 유의한 차이가 났으며 (p<0. 01) 특히 두 그룹 모두 HF 의 값이 유의하게 변화하는 것을 보았을 때 천도선법 기수련이 부교감신경의 활동을 조절하여 자율신경계를 안정화 시킨다는 것을 보여주었다. The effects of ChunDoSunBup (CDSB) Qi-training on the power spectrum of heart rate variability were studied in 20 healthy subjects and 20 CDSB Qi-trainee (subjects with CDSB Qi-training for 4-12 months) Continuous ECG signals were recorded during 1) 10 min of rest in sitting position, 2) 1 hour of CDSB Qi-training , 3) 10 min of post-training. Fast Fourier transformation was used to determine the power spectrum of heart rate variability While CDSB Qi-training, there were significant decrease in the ratio of low to high frequency power spectrum. And value of pre and mild-training in CDSB Qi-trainees were lower than that of control subjects There was a significant changes in high frequency power of both group, but net in low frequency These results suggest that CDSB Qi-training may stabilize autonomic nervous system by modulate parasympathetic nervous system.
CMS에서 전력제어를 위한 AGC의 성능 개선에 관한 연구
이원구,이철희,천종훈,박수봉,박종안,신용길 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1
CDMA 시스템에서는 이동국이 Open-loop 전력제어 및 Close-Loop 전력제어를 할 때 비 선형적인 AGC의 특성으로 인해 수신기의 감도가 현저히 낮아진다. 본 논문에서는 AGC의 비선형적인 특성 곡선값을 S/W로 선형화 시켜 RAS RAMDATA를 생성하고 이를 RAS RAM에 넣어 선형적으로 보상된 AGC특성을 얻는 알고리즘을 제안하였다. 그리고 실험을 통하여 그 유효성을 증명한다. In CDMA system, the sensitivity of receivers is lowered significantly due to characteristics of non-linear AGC when the mobile station implements open-loop power control and closed-loop power control. In this paper, We propose a algorithm that obtains linearly conpensated AGC characteristic by inserting the RAS RAM DATA in RAS RAM, which linearizes the value of non-linear characteristic graph in AGC by S/W, and the experimental results shows the validity.
이수훈,김봉석,강태한,송준엽,강재훈,서천석 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
This paper deals with a prediction method of tool life in view of the reliability assessment. In this study, the flank wear was studied among multi-factors deciding the tool wear state. Firstly, tool life was predicted by correlation between flank wear and cutting time, based on the extended Taylor tool life equation of turning data, including parameters of cutting speed, feed rate, and cutting depth. Secondly, each of cutting conditions of endmilling was equivalently converted to apply ball endmill data to the extended Taylor equation. The web-based reliability prediction program for tool life is being developed as one of reliability assessment programs to for the machine tools.