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3D Head Modeling using Depth Sensor
Song, Eungyeol,Choi, Jaesung,Jeon, Taejae,Lee, Sangyoun International Society for Simulation Surgery 2015 Journal of International Society for Simulation Su Vol.2 No.1
Purpose We conducted a study on the reconstruction of the head's shape in 3D using the ToF depth sensor. A time-of-flight camera (ToF camera) is a range imaging camera system that resolves distance based on the known speed of light, measuring the time-of-flight of a light signal between the camera and the subject for each point of the image. The above method is the safest way of measuring the head shape of plagiocephaly patients in 3D. The texture, appearance and size of the head were reconstructed from the measured data and we used the SDF method for a precise reconstruction. Materials and Methods To generate a precise model, mesh was generated by using Marching cube and SDF. Results The ground truth was determined by measuring 10 people of experiment participants for 3 times repetitively and the created 3D model of the same part from this experiment was measured as well. Measurement of actual head circumference and the reconstructed model were made according to the layer 3 standard and measurement errors were also calculated. As a result, we were able to gain exact results with an average error of 0.9 cm, standard deviation of 0.9, min: 0.2 and max: 1.4. Conclusion The suggested method was able to complete the 3D model by minimizing errors. This model is very effective in terms of quantitative and objective evaluation. However, measurement range somewhat lacks 3D information for the manufacture of protective helmets, as measurements were made according to the layer 3 standard. As a result, measurement range will need to be widened to facilitate production of more precise and perfectively protective helmets by conducting scans on all head circumferences in the future.
Cho, Jaesung,Ko, Eun Young,Jo, Kyung,Lee, Seonmin,Jang, Sungbong,Song, Minho,Jung, Samooel Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.4
Objective: This study was conducted to investigate the effect of heating of foot-and-mouth disease (FMD) vaccine before injection, on the incidence of lesions at the injection site (pork butt), amount of discarded meat, and economical benefit. Methods: In total, 101,086 piglets raised in 30 farms, were vaccinated in the neck with 2 mL of FMD vaccine at 56 d and 84 d of age using a commercial syringe. The heat treatment group (48,511 pigs) was injected with the FMD vaccine after it had been heated in a water bath at 40℃ for 20 min. After slaughter, the incidence of lesions on the pork butt was inspected, and the subsequent amount of discarded meat was recorded. Results: Heat treatment of FMD vaccine reduced the incident rate of lesions on the pork butt (p<0.01). Overall, 17.81% of the pigs in the heat treatment group had lesions, while the incident rate in the control group was 21.70%. The amount of discarded meat per head of total pigs and per head of pigs with lesions were significantly lower in the heat treatment group than the control group (p<0.01). Thus, the proportion of discarded meat to dressed carcass was lower in the heat treatment group (0.249%) compared with the control group (0.338%) (p<0.01). Farms that rear 1,000 sows can gain 1,863,289 KRW (1,600 USD) in one year when they adopt heat treatment of FMD vaccine before injection. Conclusion: Heat treatment of FMD vaccine using simple heat equipment (water bath) can be effective in reducing lesions caused by FMD vaccination and increase the economic benefits in pig farms.
Polydiacetylene-embedded microbeads for colorimetric and volumetric sensing of hydrocarbons.
Hong, Jaesung,Park, Dong-Hoon,Baek, Sunghoon,Song, Simon,Lee, Chan Woo,Kim, Jong-Man American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.15
<P>Rational design of a hydrocarbon sensor that enables visual differentiation of saturated aliphatic hydrocarbons (SAHCs) is very difficult owing to the lack of useful functional groups that can interact with the sensor system. Here, we report a microbead embedded with polydiacetylene that undergoes faster swelling and faster blue-to-red color change in response to the hydrocarbons of shorter alkyl chains. Accordingly, visual differentiation among n-pentane, n-heptane, n-nonane, and n-undecane was readily achieved. By taking advantage of the collective effect, construction of a sensor system with amplified response was possible. Combination of microfluidic technology (for bead preparation), PDMS (swellable polymeric matrix), and polydiacetylene (colorimetric material) was key to enabling this unique hydrocarbon sensor.</P>
이동 Ad Hoc 네트워크에서 다중경로를 통한 신뢰도 기반의 안전한 인증 기법
김재성 ( Jaesung Kim ),송주석 ( Jooseok Song ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
이동 Ad Hoc 네트워크에서는 노드가 신뢰받은 인증기관을 통해 인증을 받는 형식이 아니기 때문에, 멀티홉 방식에 의해 라우팅을 수행할 경우 악의적인 중간 노드에 의해 데이터의 무결성 및 기밀성 문제가 발생할 수 있다. 따라서 이동 Ad Hoc 네트워크에서 안전하게 통신하기 위해서는 네트워크에 참여한 노드 중 악의적 중간 노드를 찾아내 격리시키고, 서로 신뢰할 수 있는 노드만이 네트워크에 참여할 수 있도록 하는 방안이 필요하다. 본 논문에서는 신뢰받는 인증기관이 없는 이동 Ad Hoc 네트워크에서 신뢰도 측정을 바탕으로 노드간 상호 인증할 수 있는 새로운 방안을 제시한다.
Effects of RESET Current Overshoot and Resistance State on Reliability of RRAM
Jeonghwan Song,Daeseok Lee,Jiyong Woo,Yunmo Koo,Euijun Cha,Sangheon Lee,Jaesung Park,Kibong Moon,Misha, Saiful Haque,Prakash, Amit,Hyunsang Hwang IEEE 2014 IEEE electron device letters Vol.35 No.6
<P>Current overshoot has severe effects on the reliability of resistive random access memory (RRAM). It is well known that the current overshoot during the SET process is caused by parasitic capacitance. In this letter, we observed a different type of current overshoot during the RESET process. The RESET current overshoot was confirmed to have severe effects on the endurance of RRAM. We also demonstrated the relation between the current overshoot and the intrinsic capacitive elements of each state of RRAM. Finally, an optimized pulse shape was proposed to minimize the current overshoot and was experimentally verified to significantly improve the variability and endurance in a typical RRAM device with a W/Zr/HfO<SUB>2</SUB>/TiN structure.</P>
송지현(Jihyun Song),이재성(Jaesung Lee) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
This paper proposes a indoor-positioning method for vehicles based on image processing technology. The method obtains an absolute coordinate through QR-code scanning, and an relative coordinate of a black-box camera through the tilt and roll angle correction using affine transformation, scale transformation, and trigonometric function. Using these information of an absolute coordinate and an relative one, the precise position of a car is estimated. As a result, average error of 13.79cm is achieved and it corresponds to just 27.6% of the error of 50cm in indoor-positioning techniques based on wireless networks.
Prakash, Amit,Jaesung Park,Jeonghwan Song,Jiyong Woo,Eui-Jun Cha,Hyunsang Hwang IEEE 2015 IEEE electron device letters Vol.36 No.1
<P>Multilevel cell (MLC) storage technology is attractive in achieving ultrahigh density memory with low cost. In this letter, we have demonstrated 3-bit per cell storage characteristics in a TaO<SUB>x</SUB>-based RRAM. By analyzing the key requirements for MLC operation mainly the switching uniformity and stability of resistance levels, an engineered stack based on thermodynamics in top electrode/(vacancy reservoir/defect control layer)/switching layer/bottom electrode structure was designed. In the optimized stack with ~10-nm Ta layer incorporated at W/TaO<SUB>x</SUB> interface, seven low resistance state levels with same high resistance state were obtained by controlling the switching current down from 30 μA enabling low power 3-bit storage in contrast to the control device which shows 2-bit MLC with resistance saturation. The improved switching and MLC behavior is attributed to the minimized stochastic nature of set/reset operations due to filament confinement by favorable electric field generation and formation of thin but highly conductive filament which is confirmed electrically.</P>