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이철학,김상운 明知大學校 産業技術硏究所 2008 産業技術硏究所論文集 Vol.27 No.-
Among the facial components, the eyes play an important role in recognizing human faces. This paper proposes an effective method of detecting the eyes from facial images, where the detection is carried out two steps. First of all, eye-windows(EW) containing the eyes and eyebrows are extracted with the vertical/horizontal projections. After then, the positions of the eyes are detected by applying the normalized cross correlation (CC)method to the eye window extracted in the first step. While searching the EWs, we have took smoothing firstly to reduce influence of noise and sharper bounds. From the experimental results tor the well-known face databases, we have confirmed a possibility that the proposed method, which is hierarchically combined with EW and CC in sequence, could be available one for appearance based face retrieval.
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이철학,김상운 명지대학교 산업기술연구소 2006 産業技術硏究所論文集 Vol.25 No.-
Image segmentation is an essential preliminary step in pattern recognition and scene analysis problems. Thresholding is a fundamental approach to segmentation that utilizes a significant degree of pixel popularity or intensity. Otsu's thresholding is one of the most well-known methods proposed in the literature. In the Otsu's method, the normalized histogram was employed as a discrete probability density function and a criterion of maximizing the between-class variance of pixel intensity was utilized to choose a threshold value for segmentation. In this paper, first of all, we simplify the between-class variance by which we can easily compute the criterion. Then, we propose a simple thresholding method for finding multi-level threshold values by extending the Otsu's method. Our experimental results how a possibility that the proposed method could be used efficiently for image segmentation.
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문장패턴 변환방법을 이용한 韓-中-日 수화 통신 시스템에 관한 기초연구
이철학,김상운 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - In this paper, we implemented and investigated a sign-language communication system among Korean, Chinese, and Japanese as an extension of the sign-language communication system between Korean and Japanese. Using the system, the deaf-mute can chat each other with sign-language among the three country having different languages on the Internet. Additionally, a translation of sigh-language enables the people with different languages to communicate each other. The system employed the client-server architecture, where the client inputs the sentence by keyboard, and sends it to the server. Then the server translates it into target sign-language parameters and returns them to the group of clients. Finally, the client re-generates the sigh-language animation with the received parameters. At that time, we have used a translation table of language patterns to translate each other among different language structures.
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Li-li Gu,Zhe-lun Shen,Yang-Lei Li,Yi-Qi Bao,Hong Lu 한국분자세포생물학회 2018 Molecules and cells Vol.41 No.5
Oxymatrine (OMT) often used in treatment for chronic hepatitis B virus infection in clinic. However, OMT–induced liver injury has been reported. In this study, we aim to investigate the possible mechanism of OMT-induced hepatotoxicity in human normal liver cells (L02). Exposed cells to OMT, the cell viability was decreased and apoptosis rate increased, the intracellular markers of oxidative stress were changed. Simultaneously, OMT altered apoptotic related proteins levels, including Bcl-2, Bax and pro-caspase-8/-9/-3. In addition, OMT enhanced the protein levels of endoplasmic reticulum (ER) stress makers (GRP78/Bip, CHOP, and cleaved-Caspase-4) and phosphorylation of c-Jun N-terminal kinase (p-JNK), as well as the mRNA levels of GRP78/Bip, CHOP, caspase-4, and ER stress sensors (IREI, ATF6, and PERK). Pre-treatment with Z-VAD-fmk, JNK inhibitor SP600125 and N-acetyl-l-cysteine (NAC), a ROS scavenger, partly improved the survival rates and restored OMT-induced cellular damage, and reduced caspase-3 cleavage. SP600125 or NAC reduced OMT-induced p-JNK and NAC significantly lowered caspase-4. Furthermore, 4-PBA, the ER stress inhibitor, weakened inhibitory effect of OMT on cells, on the contrary, TM worsen. 4-PBA also reduced the levels of p-JNK and cleaved-caspase-3 proteins. Therefore, OMT-induced injury in L02 cells was related to ROS mediated p-JNK and ER stress induction. Antioxidant, by inhibition of p-JNK or ER stress, may be a feasible method to alleviate OMT-induced liver injury.
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Gu, Li-li,Shen, Zhe-lun,Li, Yang-Lei,Bao, Yi-Qi,Lu, Hong Korean Society for Molecular and Cellular Biology 2018 Molecules and cells Vol.41 No.5
Oxymatrine (OMT) often used in treatment for chronic hepatitis B virus infection in clinic. However, OMT-induced liver injury has been reported. In this study, we aim to investigate the possible mechanism of OMT-induced hepatotoxicity in human normal liver cells (L02). Exposed cells to OMT, the cell viability was decreased and apoptosis rate increased, the intracellular markers of oxidative stress were changed. Simultaneously, OMT altered apoptotic related proteins levels, including Bcl-2, Bax and pro-caspase-8/-9/-3. In addition, OMT enhanced the protein levels of endoplasmic reticulum (ER) stress makers (GRP78/Bip, CHOP, and cleaved-Caspase-4) and phosphorylation of c-Jun N-terminal kinase (p-JNK), as well as the mRNA levels of GRP78/Bip, CHOP, caspase-4, and ER stress sensors (IREI, ATF6, and PERK). Pre-treatment with Z-VAD-fmk, JNK inhibitor SP600125 and N-acetyl-l-cysteine (NAC), a ROS scavenger, partly improved the survival rates and restored OMT-induced cellular damage, and reduced caspase-3 cleavage. SP600125 or NAC reduced OMT-induced p-JNK and NAC significantly lowered caspase-4. Furthermore, 4-PBA, the ER stress inhibitor, weakened inhibitory effect of OMT on cells, on the contrary, TM worsen. 4-PBA also reduced the levels of p-JNK and cleaved-caspase-3 proteins. Therefore, OMT-induced injury in L02 cells was related to ROS mediated p-JNK and ER stress induction. Antioxidant, by inhibition of p-JNK or ER stress, may be a feasible method to alleviate OMT-induced liver injury.
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Research on Hybrid Distributed Computing System Based on Embedded System
Li Zhe,Mu Dejun,Zhang Tianfan,Guo Lantian 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.11
With the rapid development of embedded system and Internet of Things technology, embedded system and smart device based on embedded system is collecting huge amounts of data, and corresponding data processing and application method have been greatly changed, different from the traditional big data and cloud computing focus , local processing and application become important trend. This paper tries to take Cortex-A7 as the main system with the stronger ability , Hadoop distributed computing system is deployed in embedded system and could meet the demand of the future data process with directly managing the resource-constrained sensors, embedded systems and smart devices . Successfully deploying over 20GB data in the test, the system is verified that it can complete most of the functions of data processing cluster , and can also manage the collected sensors and embedded system terminal ,with better research and market promotional value.
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Zhe Li,Juqiang Li,Meng Han,Lulu Liu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9
Investigating the shear strength characteristics of sliding zone soil is crucial for evaluating slope safety and stability. This paper discusses the shear strength characteristics of Lishi loess and N2laterite in the sliding zone under different influencing factors based on in-suit multiple shear tests, and the shear strength characteristics of Lishi loess were contrasted and analyzed based on field and laboratory tests. The results indicated a favorable correlation between the shear strength of soil samples and normal stress. The shear strength attenuation of clay-rich N2laterite was much larger than that of sand-rich Lishi loess with the increase of the shear stage. Importantly, the mutation points of the shear rate corresponding to the peak stress of soil samples were obtained, which can be used as a symbol to judge the transfixion of the shear plane. Moreover, the stress-strain characteristics of Lishi loess under the same normal load were diverse as a result of the different experimental methods, and the residual strength characteristics for the two tests also varied substantially. Notably, the Lishi loess in the field test has a more stable residual strength than the laboratory direct shear test conducted. The findings can aid in the comprehension of the mechanical behavior of loess and laterite on the Loess Plateau.
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An Optimized Multi-load Wireless Power Transfer System with Constant Load Currents
Zhe Zhou,Weiguo Li,Chenwen Cheng,Zhanfeng Deng,Fangyi Li,Qiuyu Shi,Chris Mi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a multi-load wireless power transfer (WPT) system using repeater coils. The repeater unit that contains two repeater units is designed. The series-parallel-series (SPS) compensation method is used for each repeater unit. The constant load current for all the loads can be obtained with suitable resonant condition when neglecting the coils’ parasitic resistances. A feasible coil structure is designed where the two repeater coils in the same repeater unit are both bipolar that are placed perpendicularly so that the coupling between them can be neglected. A ferrite plate is inserted between the two bipolar coils in each repeater unit to enhance the magnetic coupling between adjacent units. Moreover, the proposed system has been optimized so that the system efficiency can be improved. The simulation results are given to validate the effectiveness of the proposed WPT system.
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