• Title/Summary/Keyword: active reflectivity

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Real-Time Multiple Face Detection Using Active illumination (능동적 조명을 이용한 실시간 복합 얼굴 검출)

  • 한준희;심재창;설증보;나상동;배철수
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.05a
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    • pp.155-160
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    • 2003
  • This paper presents a multiple face detector based on a robust pupil detection technique. The pupil detector uses active illumination that exploits the retro-reflectivity property of eyes to facilitate detection. The detection range of this method is appropriate for interactive desktop and kiosk applications. Once the location of the pupil candidates are computed, the candidates are filtered and grouped into pairs that correspond to faces using heuristic rules. To demonstrate the robustness of the face detection technique, a dual mode face tracker was developed, which is initialized with the most salient detected face. Recursive estimators are used to guarantee the stability of the process and combine the measurements from the multi-face detector and a feature correlation tracker. The estimated position of the face is used to control a pan-tilt servo mechanism in real-time, that moves the camera to keep the tracked face always centered in the image.

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RF Magnetron Spurrering법으로 증착한 IGZO 박막의 특성과 IGZO TFT의 전기적 특성에 미치는 RF Power의 영향

  • Jung, Yeon-Hoo;Kim, Se-Yun;Jo, Kwang-Min;Lee, Joon-Hyung;Kim, Jeong-Joo;Heo, Young-Woo
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.340.2-340.2
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    • 2014
  • 최근 비정질 산화물 반도체는 가시광 영역에서의 투명도와 낮은 공정 온도, 그리고 높은 Field-effect mobility로 인해 Thin film transistors의 Active channel layer의 재료로 각광 받고 있다. ZnO, IZO, IGO, ITGO등의 많은 산화물 반도체들이 TFT의 채널층으로의 적용을 위해 활발히 연구되고 있으며, 특히 비정질 IGZO는 비정질임에도 불구하고 Mobility가 $10cm^2/Vs$ 정도로 기존의 a-Si:H 보다 높은 Mobility 특성을 나타내고 있어 대화면 디스플레이와 고속 구동을 위한 LCD에 적용 할 수 있으며 또한 낮은 공정 온도로 인해 플렉서블 디스플레이에 응용될 수 있다는 장점이 있다. 우리는 RF magnetron sputtering법으로 증착한 비정질 IGZO TFT(Thin Film Transistors)의 전기적 특성과 IGZO 박막의 특성에 미치는 RF power의 영향을 연구하였다. 제작한 TFTs의 Active channel layer는 산소분압 1%, Room temperature에서 RF power별(50~150 W)로 Si wafer 기판 위에 30nm로 증착 하였고 100 nm의 $SiO_2$가 절연체로 사용되었다. 또한 박막 특성을 분석하기 위해 같은 Chamber 분위기에서 100 nm로 IGZO 박막을 증착하였다. 비정질 IGZO 박막의 X-ray reflectivity(XRR)을 분석한 결과 RF Power가 50 W에서 150 W로 증가 할수록 박막의 Roughness는 22.7 (${\AA}$)에서 6.5 (${\AA}$)로 감소하고 Density는 5.9 ($g/cm^3$)에서 6.1 ($g/cm^3$)까지 증가하는 경향을 보였다. 또한 제작한 IGZO TFTs는 증착 RF Power가 증가함에 따라 Threshold voltage (VTH)가 0.3~4(V)로 증가하는 경향을 나타내고 Filed-effect mobility도 6.2~19 ($cm^2/Vs$)까지 증가하는 경향을 보인다. 또한 on/off ratio는 모두 > $10^6$의 값을 나타내며 subthreshold slope (SS)는 0.3~0.8 (V/decade)의 값을 나타낸다.

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Development of Tracking Equipment for Real­Time Multiple Face Detection (실시간 복합 얼굴 검출을 위한 추적 장치 개발)

  • 나상동;송선희;나하선;김천석;배철수
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.7 no.8
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    • pp.1823-1830
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    • 2003
  • This paper presents a multiple face detector based on a robust pupil detection technique. The pupil detector uses active illumination that exploits the retro­reflectivity property of eyes to facilitate detection. The detection range of this method is appropriate for interactive desktop and kiosk applications. Once the location of the pupil candidates are computed, the candidates are filtered and grouped into pairs that correspond to faces using heuristic rules. To demonstrate the robustness of the face detection technique, a dual mode face tracker was developed, which is initialized with the most salient detected face. Recursive estimators are used to guarantee the stability of the process and combine the measurements from the multi­face detector and a feature correlation tracker. The estimated position of the face is used to control a pan­tilt servo mechanism in real­time, that moves the camera to keep the tracked face always centered in the image.

Exploring the Experiences of Participating Spiritualty Education Program by Social Workers: focusing on CPE (사회복지사의 영성(Spiritualty)교육프로그램 참여 후 변화 경험 연구: 임상사목교육(CPE)을 중심으로)

  • Kim, Kyung Mee
    • The Journal of the Korea Contents Association
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    • v.16 no.6
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    • pp.537-549
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    • 2016
  • Interest in spirituality in the workplace is rising as an alternative to overcome the possibility of burnout of social workers. This research has evaluated the results of spirituality education program to social workers in senior welfare centers. CPE(Clinical Pastoral Education) was provided to 25 social workers in 3 different senior welfare centers for 12 to 14 weeks. 4 Focus group interviews with 24 education participants after the end of education were conducted. For the participants of CPE, there were changes in individual levels(habituation of self-reflectivity, the integration of personal spirituality and social worker's spiritualty, expansion of self-awareness and pursuit of altruism), practice behavior(recognition of client's individualism, getting rid of the obsession of proposing a resolution, active listening), and organization levels(intimate fellowship, increase in horizontal relationship in the agencies). Pursuing changes within the organization towards integrating individual and organization spirituality along with social welfare organizations helping the development of social worker's individual spirituality for the simultaneous growth of social workers and the organizations is necessary.

Drilling Gas Hydrate at Hydrate Ridge, ODP Leg 204

  • Lee Young-Joo;Ryu Byong-Jae;Kim Ji-Hoon;Lee Sang-Il
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.663-666
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    • 2005
  • Gas hydrates are ice-like compounds that form at the low temperature and high pressure conditions common in shallow marine sediments at water depths greater than 300-500 m when concentrations of methane and other hydrocarbon gases exceed saturation. Estimates of the total mass of methane carbon that resides in this reservoir vary widely. While there is general agreement that gas hydrate is a significant component of the global near-surface carbon budget, there is considerable controversy about whether it has the potential to be a major source of fossil fuel in the future and whether periods of global climate change in the past can be attributed to destabilization of this reservoir. Also essentially unknown is the interaction between gas hydrate and the subsurface biosphere. ODP Leg 204 was designed to address these questions by determining the distribution, amount and rate of formation of gas hydrate within an accretionary ridge and adjacent basin and the sources of gas for forming hydrate. Additional objectives included identification of geologic proxies for past gas hydrate occurrence and calibration of remote sensing techniques to quantify the in situ amount of gas hydrate that can be used to improve estimates where no boreholes exist. Leg 204 also provided an opportunity to test several new techniques for sampling, preserving and measuring gas hydrates. During ODP Leg 204, nine sites were drilled and cored on southern Hydrate Ridge, a topographic high in the accretionary complex of the Cascadia subduction zone, located approximately 80km west of Newport, Oregon. Previous studies of southern Hydrate Ridge had documented the presence of seafloor gas vents, outcrops of massive gas hydrate, and a pinnacle' of authigenic carbonate near the summit. Deep-towed sidescan data show an approximately $300\times500m$ area of relatively high acoustic backscatter that indicates the extent of seafloor venting. Elsewhere on southern Hydrate Ridge, the seafloor is covered with low reflectivity sediment, but the presence of a regional bottom-simulating seismic reflection (BSR) suggests that gas hydrate is widespread. The sites that were drilled and cored during ODP Leg 204 can be grouped into three end-member environments basedon the seismic data. Sites 1244 through 1247 characterize the flanks of southern Hydrate Ridge. Sites 1248-1250 characterize the summit in the region of active seafloor venting. Sites 1251 and 1252 characterize the slope basin east of Hydrate Ridge, which is a region of rapid sedimentation, in contrast to the erosional environment of Hydrate Ridge. Site 1252 was located on the flank of a secondary anticline and is the only site where no BSR is observed.

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