Hand Command Synthesis Based on Hand Gesture Recognition

He XiaoYu,Li-Wei,Sang-Yun Park,Jeong Goo Kim,Sung-Jin Kim,Eung-Joo Lee 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-

In this paper, we utilize hand gesture information to recognize hand gesture. Firstly, we can utilize human skin color information in YCbCr color model to detect human skin region, and then use edge detection algorithm to detect skin region edge, and confirm the rotundity rate constant for every region by comparing region length to area value. Because that for human hand, it contain very complex edge, so hand's rotundity rate is usually very large. Through this method we can easily confirm hand region and remove those small parts which we call it noise parts. Then we segment the hand region into 5 by 5 pieces and calculate pixel rate of every region to extract eigenvector of hand. We employed a recognition machine based on neural net to recognize the detected hand posture. For recognized hand posture, we then code it to make a corresponding command for synthesizing a sound. And for hand gesture, we can divide the input video into several frames, and in every frame, we can applied the hand posture recognition to recognize the information.

Hand Posture Recognition Based on PCA

He XiaoYu,Sang-Yoon Park,Jung-Hoon Kim,Young-Il Kim,Chang-Min Seo,Eung-Joo Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

In this paper, we present an algorithm which detects human hand by skin color information in YCbCr and HIS color model. And for confirming special human hand we use circle rate of region to detect hand region because human hand have complex edge than other region, thus circle rate of hand region is usually more greater. For the recognition of detected hand, we use the Hausdorff to tracking the hand region. And we employed a recognition method based on PCA algorithm to recognize the hand gestures. The experimental results show that an algorithm plays an efficient effort for hand gesture recognition.

Hand Gesture Recognition Using Neural Network

He XiaoYu,Sang-Yoon Park(박상윤),Jung-Hoon Kim(김정훈),Young-Il Kim(김영일),Chang-Min Seo(서창민),Eung-Joo Lee(이응주) 한국멀티미디어학회 2007 한국멀티미디어학회 학술발표논문집 Vol.2007 No.1

In this paper, we present an algorithm which detects human hand by skin color information in YCbCr and HIS color model. And for confirming special human hand we use circle rate of region to detect hand region because human hand have complex edge than other region, thus circle rate of hand region is usually more greater. For the recognition of detected hand, we segmented it into 5 by 5 paces and calculate the pixel rate of every piece to extract eigenvector of hand region. And we employed a recognition method based on neural network algorithm to recognize the hand gestures. The experimental results show that an algorithm plays an efficient effort for hand gesture recognition.

EFFECT OF THIOPHENE IN BITHIAZOLE-BRIDGED SENSITIZERS ON THE PERFORMANCE OF DYE-SENSITIZED SOLAR CELLS

XIAOYU ZHANG,JIANLI HUA,JINXIANG HE,WENJUN WU,HANS AGREN,XIN LI,FULING GUO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5

In this paper, we have designed and synthesized four bithiazole-bridged sensitizers (BT-T2,TBT-T2, BT-T3 and TBT-T3) with triphenylamine and indoline as the donor segment andapplied them to dye-sensitized solar cells (DSSCs). For triphenylamine-based sensitizers as BT-T2 and TBT-T2, adding one thiophene unit between triphenylamine donor and bithiazolemoiety not only led to bathochromic shift of the maximum absorption and increase of molarextinction coe±cient, but also enhanced the photovoltaic conversion e±ciency from 7.12% ofBT-T2 to 7.51% of TBT-T2. But for indoline-based sensitizers as BT-T3 and TBT-T3,adding one thiophene unit between indoline donor and bithiazole moiety resulted in hypochro-matic shift instead of bathochromic shift. We employed the density functional theory (DFT)calculations to further investigate the in°uence of the thiophene unit on their optical and elec-tronic properties and photovoltaic performance of corresponding DSSC devices. Given theresults, a reasonable explanation is the introduction of thiophene unit suppressed the intramo-lecular charge transfer and charge separation in the conjugation system of indoline-based sen-sitizer, which led to the hypochromatic shift of the maximum absorption wavelength and ¯nallythe low Jsc . Since the Jsc dropped sharply from 15.26 mAcm? 2 to 4.52 mAcm? 2 , the photovoltaicconversion e±ciency decreased dramatically from 7.86% to 1.93%.

Solvothermal Synthesis of Novel 3D Peony-Like TiO2 Microstructures and its Enhanced Photocatalytic Activity

Yugan He,Qi Yan,Xiaoyu Chang,Meiying Zhu,Weiwei Wang,Menglong Dong,Lianjie Song,Junjiao Yang,Yaodong Huang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.5

A TiO2 photocatalyst with peony-like microstructures and a large percentage of exposed {001} facets was synthesized using a facile solvethermal method. The peony-like TiO2 was obtained using HF as a capping agent, TiCl4 as the precursor and ethanol as the solvothermal agent. The parameters which influence the mophology and formation mechanism of the products including the HF concentration, the reaction time and temperature and the solvothermal solvent, were investigated. The samples were characterized using field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction and N2 adsorption and desorption analysis. As the reaction time or reaction temperature increased, the morphology TiO2 changed from hexagonally assembled microspheres to peony-like microflowers which were composed of stacks of ultrathin nanosheets. The other reaction parameters also play a crucial role in the formation of the TiO2 microstuctures. Photocatalytic experiments showed that the synthesized TiO2 out-performed Degussa P25 in the photodegradation of methelene blue under a very weak UV light irradiation (power: 8 W, light intensity: 0.4mW cm -1).

Pressure Contact Interconnection for High Reliability Medium Power Integrated Power Electronic Modules

Xu Yang,Wenjie Chen,Xiaoyu He,Xiangjun Zeng,Zhaoan Wang 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.4

This paper presents a novel spring pressure contact interconnect technique for medium power integrated power electronics modules (IPEMs). The key technology of this interconnection is a spring which is made from Be-Cu alloy. By means of the string pressure contact, sufficient press-contact force and good electrical interconnection can be achieved. Another important advantage is that the spring exhibits excellent performance in enduring thermo-mechanical stress. In terms of manufacture procedure, it is also comparatively simple. A 4 ㎾ half-bridge power inverter module is fabricated to demonstrate the performance of the proposed pressure contact technique. Electrical, thermal and mechanical test results of the packaged device are reported. The results of both the simulation and experiment have proven that a good performance can be achieved by the proposed pressure contact technique for the medium power IPEMs.

Pressure Contact Interconnection for High Reliability Medium Power Integrated Power Electronic Modules

Yang, Xu,Chen, Wenjie,He, Xiaoyu,Zeng, Xiangjun,Wang, Zhaoan The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.4

This paper presents a novel spring pressure contact interconnect technique for medium power integrated power electronics modules (IPEMs). The key technology of this interconnection is a spring which is made from Be-Cu alloy. By means of the string pressure contact, sufficient press-contact force and good electrical interconnection can be achieved. Another important advantage is that the spring exhibits excellent performance in enduring thermo-mechanical stress. In terms of manufacture procedure, it is also comparatively simple. A 4 kW half-bridge power inverter module is fabricated to demonstrate the performance of the proposed pressure contact technique. Electrical, thermal and mechanical test results of the packaged device are reported. The results of both the simulation and experiment have proven that a good performance can be achieved by the proposed pressure contact technique for the medium power IPEMs.

Implementation of Image Transmission Based on Vehicle-to-Vehicle Communication

Chang-hao Piao,Xiaoyue Ding,Jia He,장수현,Mingjie Liu 한국정보처리학회 2022 Journal of information processing systems Vol.18 No.2

Weak over-the-horizon perception and blind spot are the main problems in intelligent connected vehicles(ICVs). In this paper, a V2V image transmission-based road condition warning method is proposed to solvethem. The encoded road emergency images which are collected by the ICV are transmitted to the on-board unit(OBU) through Ethernet. The OBU broadcasts the fragmented image information including location and clockof the vehicle to other OBUs. To satisfy the channel quality of the V2X communication in different times, theoptimal fragment length is selected by the OBU to process the image information. Then, according to theposition and clock information of the remote vehicles, OBU of the receiver selects valid messages to decodethe image information which will help the receiver to extend the perceptual field. The experimental resultsshow that our method has an average packet loss rate of 0.5%. The transmission delay is about 51.59 ms inlow-speed driving scenarios, which can provide drivers with timely and reliable warnings of the roadconditions.

The Hardware Cost and Computing Accuracy Trade-off in Multipliers using Imprecise 4-2 Compressors for Image Processing Applications

Yongqiang Zhang,Cong He,Xiaoyue Chen,Guangjun Xie 대한전자공학회 2022 IEIE Transactions on Smart Processing & Computing Vol.11 No.3

Approximate computing has been widely used in image processing applications to significantly reduce the hardware cost of circuits; however, this induces a sacrifice in computing accuracy. The compromise between accuracy and hardware cost in approximate multipliers has not been investigated yet. To address this issue, this paper proposes a set of approximate 8×8 Dadda multipliers built by using an efficient imprecise 4-2 compressor. The compressor introduces symmetrical errors into the truth table of the exact design to reach a simpler structure. Furthermore, as an important image processing application, image multiplication is implemented with the proposed multipliers. Synthesis and simulation results show that the overall performance of the multipliers varies depending on the various assessment criteria. Utilization of the modified compressor in the multipliers results in area, delay, and power reductions of 38%-72%, 14%-33%, and 39%-77%, respectively, compared to the exact design, while maintaining acceptable computing accuracy in image multiplication. According to the results, the proposed multipliers achieve a better trade-off between energy efficacy and computing accuracy than the existing designs, which could be certified as options for exact multipliers in image processing.

Genomic Characteristics and the Potential Clinical Implications in Oligometastatic Non–Small Cell Lung Cancer

Rongxin Liao,Kehong Chen,Jinjin Li,Hengqiu He,Guangming Yi,Mingfeng Huang,Rongrong Chen,Lu Shen,Xiaoyue Zhang,Zaicheng Xu,Zhenzhou Yang,Yuan Peng 대한암학회 2023 Cancer Research and Treatment Vol.55 No.3

Purpose Oligometastatic non–small cell lung cancer (NSCLC) patients have been increasingly regarded as a distinct group that could benefit from local treatment to achieve a better clinical outcome. However, current definitions of oligometastasis are solely numerical, which are imprecise because of ignoring the biological heterogeneity caused by genomic characteristics. Our study aimed to profile the molecular alterations of oligometastatic NSCLC and elucidate its potential difference from polymetastasis. Materials and Methods We performed next-generation sequencing to analyze tumors and paired peripheral blood from 77 oligometastatic and 21 polymetastatic NSCLC patients to reveal their genomic characteristics and assess the genetic heterogeneity. Results We found ERBB2, ALK, MLL4, PIK3CB, and TOP2A were mutated at a significantly lower frequency in oligometastasis compared with polymetastasis. EGFR and KEAP1 alterations were mutually exclusive in oligometastatic group. More importantly, oligometastasis has a unique significant enrichment of apoptosis signaling pathway. In contrast to polymetastasis, a highly enriched COSMIC signature 4 and a special mutational process, COSMIC signature 14, were observed in the oligometastatic cohort. According to OncoKB database, 74.03% of oligometastatic NSCLC patients harbored at least one actionable alteration. The median tumor mutation burden of oligometastasis was 5.00 mutations/Mb, which was significantly associated with smoking, DNA damage repair genes, TP53 mutation, SMARCA4 mutation, LRP1B mutation, ABL1 mutation. Conclusion Our results shall help redefine oligometastasis beyond simple lesion enumeration that will ultimately improve the selection of patients with real oligometastatic state and optimize personalized cancer therapy for oligometastatic NSCLC.