실내 환경에서의 이동로봇의 위치추정을 위한 카메라 센서 네트워크 기반의 실내 위치 확인 시스템

Ji, Yonghoon,Yamashita, Atsushi,Asama, Hajime 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.11

This paper proposes a novel indoor positioning system (IPS) that uses a calibrated camera sensor network and dense 3D map information. The proposed IPS information is obtained by generating a bird's-eye image from multiple camera images; thus, our proposed IPS can provide accurate position information when objects (e.g., the mobile robot or pedestrians) are detected from multiple camera views. We evaluate the proposed IPS in a real environment with moving objects in a wireless camera sensor network. The results demonstrate that the proposed IPS can provide accurate position information for moving objects. This can improve the localization performance for mobile robot operation.

실내 환경에서의 이동로봇의 위치추정을 위한 카메라 센서 네트워크 기반의 실내 위치 확인 시스템

지용훈(Yonghoon Ji),Atsushi Yamashita,Hajime Asama 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.11

This paper proposes a novel indoor positioning system (IPS) that uses a calibrated camera sensor network and dense 3D map information. The proposed IPS information is obtained by generating a bird’s-eye image from multiple camera images; thus, our proposed IPS can provide accurate position information when objects (e.g., the mobile robot or pedestrians) are detected from multiple camera views. We evaluate the proposed IPS in a real environment with moving objects in a wireless camera sensor network. The results demonstrate that the proposed IPS can provide accurate position information for moving objects. This can improve the localization performance for mobile robot operation.

A Geometric-Statistic Channel Model for THz Indoor Communications

Choi, Yonghoon,Choi, Ji-Woong,Cioffi, John M. Springer-Verlag 2013 Journal of infrared, millimeter and terahertz wave Vol.34 No.7

Lane-Changing Feature Extraction Using Multisensor Integration

Hanwool Woo,Yonghoon Ji,Hitoshi Kono,Yusuke Tamura,Yasuhide Kuroda,Takashi Sugano,Yasunori Yamamoto,Atsushi Yamashita,Hajime Asama 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10

We propose a feature extraction method for lane changes of other traffic participants. According to previous research, over 90 % of car crashes are caused by human mistakes, and lane changes are the main factor. Therefore, if an intelligent system can predict a lane change and alarm a driver before another vehicle crosses the center line, this can using the multisensor system which consists of a position sensor and a laser scanner with line markings information. For a lane change prediction of other traffic participants, the most effective features are a lateral position and velocity with respect to a center line. We installed the sensor system to the primary vehicle and measured positions of other traffic participants while the primary vehicle drives on a highway. We extracted the features as the distance with respect to the center line and the lateral velocity of other vehicles using the measurement data. We confirmed that our feature extraction method has an enough accuracy for the lane change prediction.

인체 모델과 차량 모델을 이용한 보행자 사고 상해에 관한 비교 분석

지성호(Sungho Ji),이용훈(Yonghoon Lee),전희정(Huijeong Jeon) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11

The number of road traffic fatalities is decreasing over the last 10 years in Korea. But according to an Korea road traffic authority’s report, Pedestrians accident rate of Korea is the highest among OECD countries and more than 2000 pedestrians are killed every year in a road accident. For the reason, car manufactures are trying to protect pedestrian by a lot of tests or numerical simulation studies. As the vehicle sale market becomes more competitive, pedestrian protection become more important. This study examines the pedestrian injuries during impact with the front of cars by numerical simulation and focused human body model behavior and injury risk. Influence of vehicle and pedestrian type are studied through the use of Mini, Small, SUV car with 6YO, 5<SUP>th</SUP> percentile, 50<SUP>th</SUP> percentile, 50<SUP>th</SUP> percentile FE model

정화 보조지표와 시료 채취 방법 제안을 통한 토양정화검증 제도 개선 연구

권지철,이군택,김태승,윤정기,김지인,김용훈,김준영,최정민,Kwon, Ji Cheol,Lee, Goontaek,Kim, Tae Seung,Yoon, Jeong-Ki,Kim, Ji-in,Kim, Yonghoon,Kim, Joonyoung,Choi, Jeongmin 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.6

In addition to the measurement of the concentration of soil contaminants, the new idea of indicative parameters was proposed to validate the remedial works through the monitoring for the changes of soil characteristics after applying the clean up technologies. The parameters like CFU (colony forming unit), pH and soil texture were recommended as indicative parameters for land farming. In case of soil washing, water content and the particle size distribution of the sludge were recommended as indicative parameters. The sludge is produced through the particle separation process in soil washing and it is usually treated as a waste. The parameters like water content, organic matter content, CEC (cation exchange capacity) and CFU were recommended as indicative parameters for the low temperature thermal desorption method. Besides the indicative parameter, sampling methods in stock pile and the optimal minimum amount of composite soil sample were proposed. The rates of sampling error in regular grid, zigzag, four bearing, random grid methods were 17.3%, 17.6%, 17.2% and 16.5% respectively. The random grid method showed the minimum sampling error among the 4 kinds of sampling methods although the differences in sampling errors were very little. Therefore the random grid method was recommended as an appropriate sampling method in stock pile. It was not possible to propose a value of optimal minimum amount of composite soil sample based on the real analytical data due to the dynamic variation of $CV_{fund{\cdot}error}$. Instead of this, 355 g of soil was recommended for the optimal minimum amount of composite soil sample under the assumption of ISO 10381-8.

Evaluating high-resolution forecasts of atmospheric CO and CO₂ from a global prediction system during KORUS-AQ field campaign

Tang, Wenfu,Arellano, Avelino F.,DiGangi, Joshua P.,Choi, Yonghoon,Diskin, Glenn S.,Agustí,-Panareda, Anna,Parrington, Mark,Massart, Sebastien,Gaubert, Benjamin,Lee, Youngjae,Kim, Danbi,Jung, Ji Copernicus GmbH 2018 Atmospheric Chemistry and Physics Vol.18 No.15

<P><p><strong>Abstract.</strong> <span id='page11008'/>Accurate and consistent monitoring of anthropogenic combustion is imperative because of its significant health and environmental impacts, especially at city-to-regional scale. Here, we assess the performance of the Copernicus Atmosphere Monitoring Service (CAMS) global prediction system using measurements from aircraft, ground sites, and ships during the Korea-United States Air Quality (KORUS-AQ) field study in May to June 2016. Our evaluation focuses on CAMS CO and <span class='inline-formula'>CO₂</span> analyses as well as two higher-resolution forecasts (16 and 9<span class='thinspace'></span>km horizontal resolution) to assess their capability in predicting combustion signatures over east Asia. Our results show a slight overestimation of CAMS <span class='inline-formula'>CO₂</span> with a mean bias against airborne <span class='inline-formula'>CO₂</span> measurements of 2.2, 0.7, and 0.3<span class='thinspace'></span>ppmv for 16 and 9<span class='thinspace'></span>km <span class='inline-formula'>CO₂</span> forecasts, and analyses, respectively. The positive <span class='inline-formula'>CO₂</span> mean bias in the 16<span class='thinspace'></span>km forecast appears to be consistent across the vertical profile of the measurements. In contrast, we find a moderate underestimation of CAMS CO with an overall bias against airborne CO measurements of <span class='inline-formula'>−</span>19.2 (16<span class='thinspace'></span>km), <span class='inline-formula'>−</span>16.7 (9<span class='thinspace'></span>km), and <span class='inline-formula'>−</span>20.7<span class='thinspace'></span>ppbv (analysis). This negative CO mean bias is mostly seen below 750<span class='thinspace'></span>hPa for all three forecast/analysis configurations. Despite these biases, CAMS shows a remarkable agreement with observed enhancement ratios of CO with <span class='inline-formula'>CO₂</span> over the Seoul metropolitan area and over the West (Yellow) Sea, where east Asian outflows were sampled during the study period. More efficient combustion is observed over Seoul (<span class='inline-formula'><math xmlns='http://www.w3.org/1998/Math/MathML' id='M12' display='inline' overflow='scroll' dspmath='mathml'><mrow><mi mathvariant='normal'>d</mi><mrow class='chem'><mi mathvariant='normal'>CO</mi></mrow><mo>/</mo><mi mathvariant='normal'>d</mi><mrow class='chem'><msub><mi mathvariant='normal'>CO</mi><mn mathvariant='normal'>2</mn></msub></mrow><mo>=</mo><mn mathvariant='normal'>9</mn></mrow></math><span><svg:svg xmlns:svg='http://www.w3.org/2000/svg' width='77pt' height='14pt' class='svg-formula' dspmath='mathimg' md5hash='e15dbed157728345ac15fd0589ea867d'><svg:image xmlns:xlink='http://www.w3.org/1999/xlink' xlink:href='acp-18-11007-2018-ie00001.svg' width='77pt' height='14pt' src='acp-18-11007-2018-ie00001.png'/></svg:svg></span></span><span class='thinspace'></span>ppbv<span class='thinspace'></span>ppmv<span class='inline-formula'>⁻¹</span>) compared to the West Sea (<span class='inline-formula'><math xmlns='http://www.w3.org/1998/Math/MathML' id='M14' display='inline' overflow='scroll' dspmath='mathml'><mrow><mi mathvariant='normal'>d</mi><mrow class='chem'><mi mathvariant='normal'>CO</mi></mrow><mo>/</mo><mi mathvariant='normal'>d</mi><mrow class='chem'><msub><mi mathvariant='normal'>CO</mi><mn mathvariant='normal'>2</mn></msub></mrow><mo>=</mo><mn mathvariant='normal'>28</mn></mrow></math><span><svg:svg xmlns:svg='http://www.w3.org/2000/svg' width='83pt' height='14pt' class='svg-formula' dspmath='mathimg' md5hash='3be8931fd245903ba9a1c1d59edabca9'><svg:image xmlns:xlink='http://www.w3.org/1999/xlink' xlink:href='acp-18-11007-2018-ie00002.svg' width='83pt' height='14pt' src='acp-18-11007-2018-ie00002.png'/></svg:svg></span></span><span class='thinspace'></span>ppbv<span class='thinspace'></span>pp

Long-term Effects of the Eradication of Helicobacter pylori on Metabolic Parameters, Depending on Sex, in South Korea

Park Jaehyung,Kim Nayoung,Kim Won Seok,Lim Seon Hee,Choi Yonghoon,Jo Hyeong Ho,Ji Eunjeong,Yoon Hyuk,Shin Cheol Min,Park Young Soo,Lee Dong Ho 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.1

Background/Aims: Helicobacter pylori (HP) infection is positively associated with metabolic syndrome (MS). However, the long-term effects of eradication therapy on MS and sex differences have not been thoroughly studied. We aimed to investigate the long-term effects of HP eradication on MS and sex differences. Methods: This study included 2,267 subjects who visited a tertiary referral center between May 2003 and May 2019. HP was diagnosed by histology, a Campylobacter-like organism test, and culture, and the subjects were prospectively followed up. The participants were categorized into three groups: HP uninfected, HP infected but non-eradicated, and HP eradicated. The baseline characteristics and changes in metabolic parameters after HP eradication were compared over a 5-year follow-up period. Results: Among 1,521 subjects, there was no difference in baseline metabolic parameters between the HP-uninfected (n=509) and HP-infected (n=1,012) groups, regardless of sex. Analysis of the metabolic parameters during follow-up among HP-uninfected (n=509), HP-non-eradicated (n=346), and HP-eradicated (n=666) groups showed that high-density lipoprotein (HDL) and the body mass index (BMI) increased after eradication, with a significant difference at 1-year of follow-up. In females, HDL increased after eradication (p=0.023), and the BMI increased after eradication in male subjects (p=0.010). After propensity score matching, the HDL change in female remained significant, but the statistical significance of the change in BMI in the male group became marginally significant (p=0.089). Conclusions: HP eradication affected metabolic parameters differently depending on sex. HDL significantly increased only in females over time, especially at 1-year of follow-up. In contrast, BMI showed an increasing tendency over time in males, especially at the 1-year follow-up.