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.

얼굴영상검색을 위한 눈 위치 추출

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.

영상분할을 위한 간단한 멜티레벨 스레쉬홀딩법

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.

Plant regeneration via callus-mediated organogenesis in commercial variety of Chuanbeichai No. 1 in Bupleurum chinense DC

Li Yuchan,Zhao Jun,Chen Hua,Yu Xia,Li Hui,Zhang Yu,Feng Liang,Wu Zhe,Xie Wenlin,Hou Dabin,Yu Ma 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.2

Bupleurum chinense DC is an important medicinal plant with many active ingredients that are used for the treatment of different types of diseases and valued in pharmaceutical markets. In vitro shoot regeneration can efficiently contribute to the improvement of B. chinense. In the present study, we investigated the effects of the explant type and plant growth regulators (PGRs) on embryogenic callus induction and plant regeneration in B. chinense. Our investigation demonstrated that 2 mg/L 2,4-dichlorophenoxyacetic acid (2,4-D) combined with 1 mg/L thidiazuron (TDZ) played a major role in promoting callus induction from leaf, hypocotyl and stem 2 explants, whereas the most effective treatment for stem 1 callus formation was Murashige and Skoog (MS) medium supplemented with 1 mg/L 2,4-D, 0.5 mg/L 6-benzyladenine (BA) and 0.5 mg/L kinetin (Kin). The highest shoot regeneration rate (57.14%) was obtained from hypocotyl-induced calli in MS medium with 0.5 mg/L Kin after 12 weeks of cultivation. This regeneration protocol can be used in large-scale cultivation and may be useful for future genetic modifications of B. chinense.

Box & Stool

( Li Zhe ) 한국기초조형학회 2019 한국기초조형학회 작품집 Vol.2019 No.2

High-Power-Factor Single-Stage LCC-Resonant Inverter for LCD TV Backlights

Zhe Li,Bong-Hwan Kwon 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1

High-power-factor(HPF) single-stage series-parallel (LCC) resonant inverter for LCD TV backlights is proposed. The half-bridge LCC-resonant inverter shares switches with the power factor correction(PFC) stage to form single stage. The proposed inverter provides unity power factor to the utility line, and also, gives high energy efficiency, low cost and high reliability. Experimental results on 32 inch LCD TV backlights show the performances of the proposed inverter.

Investigating the Shear Strength Characteristics of Slip Zone Soil Based on In-situ Multiple Shear Tests

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.

A Novel Menthol-Cementing Sampling Technique for Cohesionless Coarse-Grained Fillers

Zhe Li,Zhenguo Zhu,Lulu Liu,Lei Sun,Zhongjiang Wang,Xiaowei Gu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2

It is difficult to test the engineering properties of undisturbed cohesionless coarse-grained fillers in the laboratory, especially those with low water contents because most sampling methods disturb the natural structure of the filler. This study proposes a novel sampling method that uses menthol as a temporary cement to obtain samples that are more resistant to disturbance. Liquid menthol infiltrates the interparticle spaces and cements the particles together as it cools, forming a high-strength structure. The samples can then be cut with a cutting ring (for grain sizes ≤ 0.5 mm) or a cutting machine (for grain sizes > 0.5 mm) to prepare the final samples, from which the menthol is removed by heating. To demonstrate the feasibility of the method, a number of laboratory experiments were performed, including sampling tests, confined compressive strength tests, vibration tests, drop tests, and CT scans. The optimal particle temperature for introducing the liquid menthol is 70°C, while 90°C is optimal for removing the cemented menthol. For both cost and anti-disturbance reasons, 20°C is suggested as a suitable storage temperature for menthol-cemented samples. The interspace structure undergoes less change with increases in sample depth and with larger grain sizes. We recommend that the lower two-third of the depth of a menthol-cemented block is used as the final sample for laboratory testing.

A Low Latency, Energy Efficient MAC Protocol for Wireless Sensor Networks

Li, Zhe-tao,Chen, Qian,Zhu, Geng-ming,Choi, Young-june,Sekiya, Hiroo SAGE Publications 2015 INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWOR Vol.2015 No.-

Research on the Optimal Task Scheduling Algorithm Based on SDN Architecture

Zhe Li,Zhi-Long Deng,Tian-Fan Zhang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.10

A new task scheduling algorithm based on Hadoop is proposed to optimize scheduling of resources problems under the Distributed cloud-computing platforms. The core idea of the algorithm is full reference to the current network conditions and treat it as an important reference for system task scheduling, with the bandwidth management ability ,SDN architecture allows us to allocate bandwidth according to a time slot strategy, then according to the operation completed sooner or later the time to decide whether the task assigned to the local node or low load of non-local node .In this way, we will not only ensure the locality of the task from a global perspective , but also assign tasks in an optimal way to efficiently. In the end, we do experiments based on the scheduler to verify the quality of scheduling algorithm.