• KSBB Journal
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• v.20 no.3
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• pp.142-148
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• 2005

Succinic acid is an important material in industries producing biodegradable polymers, food and pharmaceutical products, and green solvents. Furthermore, succinate fermentation is a novel process due to the fixation of $CO_2$ into succinate during fermentation. However, the impurities in fermentation broth make the separation process of succinic acid be difficult. Reactive extraction has been proposed to be an effective primary separation step of succinic acid from dilute fermentation broth. This article presents the principles of reactive extraction along with the characteristics of tertiary amino extractants. A brief overview on the current research on reactive extraction of succinic acid is presented. Finally, for the succinic acid separation, reactive extraction as a primary step is suggested in the whole downstream process for succinic acid from fermentation broth.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.49 no.6
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• pp.1-8
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• 2012

This paper presents a fully-integrated buck converter equipped with packaging inductors. These inductors include parasitic inductances of the bonding wires and lead frames in the package. They have significantly better Q factors than the best on-chip inductors implemented on silicon. This paper also proposes a low-swing gate driver for efficient regulation of high-frequency switching converters. The low-swing driver uses the voltage drop of a diode-connect transistor. The proposed converter is designed and fabricated using a $0.13-{\mu}m$ CMOS process. The fully-integrated buck converter achieves 68.7% and 86.6% efficiency for 3.3 V/2.0 V and 2.8 V/2.3 V conversions, respectively.

• Journal of the Korea Computer Graphics Society
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• v.23 no.2
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• pp.23-27
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• 2017

We propose an inter-leg collision avoidance method that compensates the disadvantage of the data-driven biped control method. The data-driven biped control technique proposed by Lee et. al [1] sometimes generates the movement that the two legs intersect with each other while walking, which can not be realized in walking of a real person or a biped robot. The proposed method changes the angle of the swing hip so that the swing foot can move inward only after passing the stance foot. This process introduces an additional angle adjustment algorithm to avoid collisions with the stance leg to the original feedback rule of the stance hip. It generates a stable walking simulation without any inter-leg collisions, by adding minimal changes and additional calculations to the existing controller behavior.

• Journal of Korea Game Society
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• v.17 no.3
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• pp.53-62
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• 2017

VR content manipulation equipment is not easy for individuals to access because it requires high prices. Especially, in the case of a system for tracking the motion of the user among the VR contents, a separate optical sensor device using an infrared camera is generally used. The disadvantage of the optical sensor equipment is that the measurable range is dependent on the measurement direction when tracking the rotation motion when using only a single device. In order to solve the above problems, this paper shows that the inertial sensor of the smartphone, which is generally owned by the public, can track the rotational motion of the user regardless of the measurement direction . The system using the LeapMotion is used as the reference system, and the system using the smart phone is defined as the evaluation system, and the usability of the evaluation system is verified by comparing the user satisfaction of the two systems.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.695-698
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• 2015

In this paper proposes bat tracking in baseball broadcasting using CAMshift and Kalman filter. The bat is changing fast during the swing, the shape also continues to rotate. For this reason, to apply the CAMshift to self adjust the size of the search window in order to use the color information to the invariant of the bat. Because it uses the color information if there are objects of similar color to the background because of the interruption on the track narrows the search range in range of motion detection by using the MHI(Motion History Image). By applying a Kalman filter, limit changing on the size of the search window, and it can be obtained higher track accuracy. But, this proposed method was limited color change by light.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.199-201
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• 2013

'Sportainment' like Golfzon, which combines the elements of sports and entertainment have a lot of potential and development as new business items in the view of overcome many limitations such as time and place in real sports. For ultimately developing baseball simulation game as 'sportainment', this paper as the early stage suggests the system which can analyze pitching and swing. Unlike speed-gun measurement for moving ball, it uses sensor technology to take information of ball speed and movement and reproduces graphic screen based on the information collected from sensors with graphic technology. Hitter's swing and hit-ball can be measured in the similar way. This baseball simulation game is expected to develop as one of successful indoor spotainment businesses such as Golfzon.

• Journal of Korea Game Society
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• v.13 no.2
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• pp.29-38
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• 2013

Recently there has been an increasing interest on tangible games in which human motions are recognized rather than the handling of keyboards and mouses. Such games require a motion controller for recognizing the motions of users. In this paper, we analyze the characteristics of values of accelerator sensors which are generated by a user who perform a tennis swing while holding a smartphone with his/her hand, and propose a method for motion recognition based on DWT(Discrete Wavelet Transform). The proposed method enables a smartphone to serve as a motion controller, so that a user can enjoy a tangible tennis game without eliminates a need for buying the device. We developed a tennis game prototype using the proposed method. To our experiment, our method showed a high recognition rate and the usefulness in the game.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.9
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• pp.1599-1604
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• 2008

In this paper, it has been analyzed how transport characteristics is influenced on gate oxide properties in the subthreshold region as nano structure FinFET is fabricated. The analytical model is used to derive transport model, and Possion equation is used to obtain analytical model. The thermionic emission and tunneling current to have an influence on subthreshold current conduction are analyzed for nano-structure FinFET, and subthreshold swings of this paper are compared with those of two dimensional simulation to verify this model. As a result, transport model presented in this paper is good agreement with two dimensional simulation model, and this study shows that the transport characteristics have been changed by gate oxide properties. As gate length becomes smaller, funneling characteristics, one of the most important transport mechanism, have been analyzed.

• Journal of the Korean Applied Science and Technology
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• v.38 no.1
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• pp.1-8
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• 2021

The purpose of this study was to analyze relationship between biomechancal factors and diver's distance during golf driver swing. Fifteen professional golfers were participated in as subject. Eight motion capture cameras(250 Hz), 2 force plates(1000 Hz), and Trackman were used to collect kinematic and kinetic datas. It was performed Pearson's correlation analysis using SPSS 24.0. The level of significance was at .05. Ball speed, club head speed, X-Factor, and ground reaction force were correlated on driving distance, However, smash factor and knee moment were not correlated on driving distnace. Ball speed, club head speed, X-Factor, and ground reaction force were effected to driving distance, but smash factor and knee moment were not effected to driving distance.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.206.1-206.1
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• 2010

폐기물 등을 열분해 가스화한 합성가스로부터 효과적으로 고순도의 수소를 회수하기 위하여 WGS(수성가스전환반응) 및 $CO_2$ 회수 PSA 공정을 적용하였다. 벤치스케일 열교환형 WGS반응기를 개발하여 기존 단열방식에 비하여 단순화한 반응시스템을 구축하였으며 출구 CO농도 4%대를 달성하였다. 또한 3베드로 구성된 벤치스케일의 $CO_2$ PSA운전을 수행한 결과, 2.5barg 흡착 및 진공재생단계를 적용하여 회수되는 $CO_2$의 농도가 95%이상, 회수율 80%이상을 기록하는 효율적인 $CO_2$ 회수공정을 개발하였다. 한편, 흡탈착 모사프로그램인 ADSIM을 통해서도 실험과 비교적 일치한 결과를 얻을 수 있었는데 향후 스케일업 설계자료 확보시 유용할 것으로 판단되었다.