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Jinho Song,Junhee Lee,Kwanghee Ko,Won-Don Kim,Tae-Won Kang,Jeung-Youb Kim,Jong-Ho Nam 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.1
In this paper, a method for classifying 3D unorganized points into interior and boundary points using a deep neural network is proposed. The classification of 3D unorganized points into boundary and interior points is an important problem in the nonuniform rational B-spline (NURBS) surface reconstruction process. A part of an existing neural network PointNet, which processes 3D point segmentation, is used as the base network model. An index value corresponding to each point is proposed for use as an additional property to improve the classification performance of the network. The classified points are then provided as inputs to the NURBS surface reconstruction process, and it has been demonstrated that the reconstruction is performed efficiently. Experiments using diverse examples indicate that the proposed method achieves better performance than other existing methods.
Effect of melt water interaction configuration on the process of steam explosion
Song, JinHo,Na, YoungSu,Hong, SeongWan,Hong, SeongHo Atomic Energy Society of Japan 2017 Journal of nuclear science and technology Vol.54 No.1
<P>Steam explosion experiments are performed at various modes of melt water interaction configuration using prototypic corium melt. The tests are performed to simulate bothmelt water interaction in a partially flooded cavity and melt water interaction in a cavity with submerged reactor. The tests are performed using zirconia and corium melts. The behavior of melt jet fragmentation during the flight in the air and fragmentation and mixing of melt jet in water is investigated by a high-speed video visualization and by comparison of debris size distribution and morphology of debris. Strength of steam explosion is estimated by measuring dynamic pressure and dynamic force.</P>
Jinho Song,Tae Hwan Koh,One Park,Daeil Kwon,Seonghoon Kang,Kyeongmin Kwak,Jong-Tae Park 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-
Background: Depression is considered as a risk factor for cardiovascular disease (CVD) and associated with changes in individuals" health status that might influence CVD risk. However, most studies have scrutinized this relationship on a rather narrower and specific study population. By focusing on general population of Korea, we sought to inspect the association of depression with CVD risk and cardiovascular risk factors. Methods: The data from the first year (2016) of the 7th Korea National Health and Nutrition Examination Survey was used. Participants were classified by the Patient Health Questionnaire-9 (PHQ-9) score as such: normal group (PHQ-9 score 0–4), mild depression (MD) group (PHQ-9 score 5–9) and moderate and severe depression (MSD) group (PHQ-9 score 10–27). General linear model was used to analyze differences and the trend of mean CVD risk according to depression level. Adjusted odds ratios (AORs) were calculated by logistic regression to identify the association between depression and cardiovascular risk factors after adjusting for age. Results: Mean CVD risk of MSD group was higher than that of normal group (p < 0.05). There was a tendency of CVD risk to increase as depression worsened (p < 0.01). Among men, MSD group was associated with current smoking (AOR, 2.97; 95% confidence interval [CI], 1.78–4.97), taking antihypertensive medications (AOR, 2.42; 95% CI, 1.26–4.66), increased fasting blood sugar (> 125 mg/dL; AOR, 2.37; 95% CI, 1.25–4.50) and taking diabetes medications (AOR, 3.08; 95% CI, 1.65–5.72). MD group was associated with current smoking (AOR, 1.60; 95% CI, 1.18–2.17). Among women, MSD group was associated with high body mass index (≥ 25 kg/m²; AOR, 1.61; 95% CI, 1.11–2.32), large waist circumference (≥ 85 cm; AOR, 1.63; 95% CI, 1.12–2.37), current smoking (AOR, 5.11; 95% CI, 3.07–8.52) and taking diabetes medications (AOR, 2.62; 95% CI, 1.68–4.08). MD group was associated with current smoking (AOR, 1.86; 95% CI, 1.18–2.93). Conclusions: We suggest that depression is associated with increased risk for CVD occurrence in general population of Korea.
Post-Fukushima challenges for the mitigation of severe accident consequences
Song, JinHo,An, SangMo,Kim, Taewoon,Ha, KwangSoon Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.11
The Fukushima accident is characterized by the fact that three reactors at the same site experienced reactor vessel failure and the accident resulted in significant radiological release to the environment, which was about 1/10 of the Chernobyl releases. The safe removal of fuel debris in the reactor vessel and Primary Containment Vessel (PCV) and treatment of huge amount of contaminated water are the major issues for the decommissioning in coming decades. Discussions on the new researches efforts being carried out in the area of investigation of the end state of fuel debris and Boling Water reactor (BWR) specific core melt progression, development of technologies for the mitigation of radiological releases to comply with the strengthened safety requirement set after the Fukushima accident are discussed.
송진호(Jinho Song),오인영(Inyoung Oh),장길상(Gilsang Jang),손문구(Moongu Son),고광희(Kwanghee Ko) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
객체 3D 데이터를 얻는 방법은 기기 발전으로 인해 다양화되고 있다. 그중 널리 쓰이는 방법 중 하나는 마커기반 정합으로 해당 방법을 사용하면 저비용 장비만으로 객체에 대한 3D 정보를 간편하게 얻을 수 있다. 그러나 마커기반 정합은 탐지된 마커 정보에 의존하고 있고, 마커 관련 정보가 손실 될 경우 정합이 제대로 수행되지 못해 정확한 3D 정보를 얻지 못한다는 문제점이 있다. 본 논문은 이와 같은 단점을 극복하기 위해 실시간으로 촬영 시 매 프레임마다 마커기반 정합 성공 여부를 체크하고, 실패시 과거 프레임들에서 마커 정보를 가져와 보안하는 알고리즘을 제안한다. Currently various 3D data acquisition method are developed, and one of the popular methods is marker-based registration method. People can conveniently obtain 3D geometric information of the object using low-cost scanners by using markers. But, it is difficult to obtain accurate 3D data if some makrer information is lost during acquisition. Therefore, this paper proposes the framework to check whether marker registration is successfull or not for each frame, and bring marker information from previous frames if the framework determines the regisration is likely to fail.
송진호(Jinho Song),송철기(Chul Ki Song),김건상(Kun Sang Kim),홍진석(Jin Seok Hong),김홍섭(Heung seob Kim),오재응(Jae-Eung Oh) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
"Development of Active Noise Control System for Vehicle's Muffler" is developing an active muffler system capable of attenuating low frequency noise levels and simultaneously improving engine performance. Its concepts will utilize a digital signal processing computer, with a cancelling actuator connected to the engine via a straight-through pipe, to cancel unwanted engine exhaust noise. With fast clock speed of 20MHz, the DSP chip allows for rapid adaption to a car engine speed changes.<br/> Sensing devices located within the Active Muffler System detect exhausted noise generated by the engine. The sensing devices relay the noise, in the form of electrical signals, to the DSP computer. The DSP analyzes the incoming information and, in response, generates mirror image elecrical signals. These inverse signals are then introduced, through transducers, into the Active Muffler System canister. Within miliseconds, cancellation occurs. Through these cancellation process, considerable noise reduction will be attatined.<br/> In this study, active muffler was designed and manufactured for exhaust noise reduction of commercial vehicle, then simulation and experiment of real vehicle was conducted.<br/>