Periodic Ground Structure for C-PHY Signaling in Mobile Applications

TaeWoong Kim,YoungBong Han,Hung Khac Le,JongWan Shim,KwangMo Yang,BumHee Bae,SoYoung Kim 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.5

In this paper, we propose periodic slit ground structure (PSG) to improve the signal integrity of multilevel signals at high data rate such as MIPI C-PHY. Periodic slits are added in the upper and lower ground planes of the stripline structure, without adding additional layers or increasing area, to reduce crosstalk among neighboring lines. The proposed PSG structure can effectively improve the eye-diagram, especially eye height (EH) in multilevel signaling. The effectiveness of the proposed structure is validated through simulation and measurement of PCB-flexible printed circuit board (FPCB)-PCB structure that emulates the interconnected system of MIPI C-PHY signal transmission in a mobile system. The measurements from the test structures show that at a 2.5 Gsps data rate condition, the PSG structures show improvement in EH and eye width (EW) by 38.6% and 9.7%, respectively, compared to stripline structures. The proposed idea can be generally applied in PCB designs that will be used in high speed multilevel signal transmission to improve EH.

Development of Wastewater Reuse Monitoring System Applied on the Information Security based on USN

Taewoong Seo,Seokcheol Lee,Myunggyun Jeong,Youngcheol Lim,Changsoo Kim 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-

This research focuses on the real-time wastewater-reuse monitoring system applied on the Information Security. Wastewater reuse Equipment System is designed to recycle the insufficient water. The aim of our system is to improve the economical efficiency of the equipment. Also, we considered that the real-time monitoring system which applied on the information security. We installed a sensor to measure the level and the flow. And we organized the data from the measurement with a sensor node and developed the system to monitor the date in real-time. Existing system have weakness for the information security. So we development system considered weakness for information security at the application to USN. Our system can increase the authenticity using the USN which is the technology isn't restricted by time and space. Also, this IT Convergence Wastewater Reuse system is expected to raise the economical efficiency.

A Study on Vulnerabilities of Monitoring and Control System based on IT Convergence Technology

Taewoong Seo,Myunggyun Jeong,Changsoo Kim 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-

The monitoring and control systems are being installed in country and government agencies in various forms. And these systems use IT convergence technology. Therefore, the computer network system installed and operated in state agencies or public service purposes must be completely integrated. Hence, in this research, we firstly interpret the expanded means of' Monitoring and Control', and analyze the expanded IT convergence monitoring and control systems. Finally, we analyze the vulnerabilities and suggest improvements on major monitoring and control systems.

Optimal Design of Loney’s Solenoid Coil by Using Particle Swam Optimization

Taewoong Lee(이태웅),Doojong Um(엄두종),Ziyan Ren(렌지얀),Chang-Seop Koh(고창섭) 대한전기학회 2014 대한전기학회 학술대회 논문집 Vol.2014 No.10

Performance of a Virtual Frisch-grid CdZnTe Detector for Prompt γ-ray Induced by 14-MeV Neutrons

TaeWoong Lee,NakJeom Kim,SeongMin Jo,YoungHak Kim,AJin Jo,WonHo Lee 한국방사성폐기물학회 2019 한국방사성폐기물학회 학술논문요약집 Vol.2019 No.10

Moving storm analyis through basin rotation method to flood events

Taewoong Park,Taesam Lee,Juyoung Shin,Nima Ghazijahani,Dongryul Lee,Hyunseung Lee 한국방재학회 2014 한국방재학회 학술발표대회논문집 Vol.2014 No.-

Hydrologic responses to variations in storm direction provide useful information for the analysis and prediction of floods and the development of watershed management strategies. However, the prediction of hydrologic responses to changes in storm direction is a difficult task that requires meteorological simulations and extensive computation. It is also difficult to identify the center of rotation of a storm affecting a basin of interest. Therefore, we propose a simple approach of rotating the basin position relative to the storm within the rainfall-runoff simulation model instead of changing the pathway of the storm, which we term the Basin Rotation Method (BRM). The proposed BRM was tested on four major typhoon events in South Korea. The results illustrated that the original basin orientation (i.e., before it was rotated) exhibits earlier and higher peak discharge and earlier recession compared to the basin after rotation. We conclude that the proposed method (BRM) is a viable alternative for use in assessing the directional influence of moving storms on floods caused by historical rather than hypothetical storm events.

Error influence of radar rainfall estimate on rainfall runoff

Taewoong Park,Taesam Lee,Sora Ahn,Dongyul Lee,Jungchan Kim,Dasang Ko 한국방재학회 2014 한국방재학회 학술발표대회논문집 Vol.2014 No.-

Radars have been widely employed to detect precipitation and to predict rainfall. However, the radar-based estimate of rainfall is affected by uncertainties or errors such as mis-calibration, beam blockage, anomalous propagation, and ground cutter. Even though these uncertainties of radar rainfall estimate (RRE) have been studied, their effect on a runoff simulation especially to the peak discharge and peak time have not been much focused. Therefore, the objective of current study is to analyze the effect of the RRE uncertainties or errors based on synthetic simulation of RRE and its effect on peak discharge. First of all, mean of modeled radar rainfall is fixed (e.g., 100mm) and its error variance was set as ±10mm, ±20mm, ±40mm, and ±50mm independent to each grid cell. This independent simulation is based on white-noise process. The second simulation included a spatial-correlation between grid cells in simulating the error variance. The relationship between the distances of rain gauges and the corresponding correlations was modeled with the power law function. The parameters of the function were estimated through meta-heuristic method (specifically harmony search). Moreover, in order to find the correlation of observed data, the whole data from 27 rain gauges in the basin and the corresponding RRE from the dual polarization radar on Mt. Bisl in Korea were employed. The results of the former simulation (independent errors to each grid cell) show that the bias of the peak discharge is increased along with the variance increased, which is caused by influence of zero values. In the latter simulation (spatially correlated errors between grid cells), the results show that the peak discharge variance from the latter presents much larger than that of the former. Furthermore, the spatial distribution pattern of the modeled radar rainfall exhibited very similar to that of the real rainfall. Finally, we concluded that the error variance of RRE on runoff simulation leading bias and high uncertainty.

Comparison of bone metabolism based on the different ages and competition levels of junior and high school female rhythmic gymnasts

( Taewoong Oh ),( Tatsuki Naka ) 한국운동영양학회 2017 Physical Activity and Nutrition (Phys Act Nutr) Vol.21 No.2

[Purpose] This study was to clarify the effect of age and competition level by measuring bone metabolism markers and bone mineral density measurements of junior high school and high school female rhythmic gymnasts, who restrict their diets to maintain a low body weight, while routinely undertaking long hours of high-intensity exercise, comparing the gymnasts based on their elite/non-elite. [Methods] The study investigated 7 junior high school and 12 high school female rhyth-mic gymnasts. For comparison by competition level, the 7 junior high school gymnasts were separated into 3 gymnasts who competed at national level (junior high school elite), and 4 gymnasts who did not compete at that level (junior high school non-elite), and the 12 high school gymnasts were separated into 7 gym-nasts who competed at national level (high school elite) and 5 gymnasts who did not compete at that level (high school non-elite). The measurement items were bone mineral density, bone metabolism markers (under-carboxylated osteocalcin (ucOC), osteocalcin (OC), bone-specific alkaline phosphatase (BAP), calcium (Ca), inorganic phosphorus (P), alkaline phosphatase (ALP), parathyroid hormone (PTH), type 1 collagen cross-linked N-telopeptide (NTx)). We also surveyed the gymnasts` height, weight and nutrition. [Results] In this study we found: 1) The high school gymnasts who competed at high-level rhythmic gymnastics had good results for bone metabolism markers and bone mineral density. 2) Elite high school gymnasts had restricted diets. 3) Nutritionally, their energy intake and carbohydrate intake was low, but their intake of protein, calcium, iron, vitamin D and vitamin K was good. [Conclusion] The results found that the elite gymnastics showed a higher bone density than the non-elite group that suggests the possibility of inhibiting bone formation in the bone metabolism.

Effects of high-intensity swimming training on the bones of ovariectomized rats

( Taewoong Oh ),( Sakura Tanaka ),( Tatsuki Naka ),( Shoji Igawa ) 한국운동영양학회 2016 Physical Activity and Nutrition (Phys Act Nutr) Vol.20 No.3

[Purpose] This study was performed to assess the effects of high-intensity intermittent swimming training(HIT) on bone in ovariectomized rats. [Methods] Six-week-old female Sprague- Dawley rats were randomly assigned to either sham operation or bilateral ovariectomy. After surgery, they were divided into the following four groups: 1) sham-operated sedentary (S), 2) sham-operated exercise training (SE), 3) OVX sedentary (O), 4) OVX exercise training (OE) 5) OVX given 17β-estradiol (OE2) and 6) OVX exercise training and given 17β-estradiol (OEE). SE, OE and OEE rats were used extremely high-intensity swim exercise. The rats repeated fourteen 20-s swimming bouts with a weight equivalent to 14, 15, and 16% of body weight for the first 5, the next 9, and the last 5 days, respectively. Between exercise bouts, a 10-s pause was allowed. HIT was originally designed as an exercise method; a method that very quickly induces an increase in the maximum oxygen intake (Tabata I et al., 1996). OEE and OE2 rats were subcutaneously injected ethanol with 25μg/kg body weight 17β-estradiol 3 times per week. [Results] Bone strength, bone mineral density and trabecular bone parameters were measured after a 8-weeks experimental period. Bone strength was significantly higher in the SE, OE, OE2 and OEE group compared with the O group. BV/TV was significant increase in the SE, OE groups compared with the O group. BMD showed no difference in the OE group compared with the O group. [Conclusion] This study demonstrate some beneficial effects of postmenopausal osteoporosis of high-intensity intermittent swimming training on bone structure and strength.

High-Performance Compton SPECT Using Both Photoelectric and Compton Scattering Events

Taewoong Lee,Younghak Kim,Won Ho Lee 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.9

In conventional single-photon emission computed tomography (SPECT), only the photoelectric events in the detectors are used for image reconstruction. However, if the 131I isotope, which emits high-energy radiations (364, 637, and 723 keV), is used in nuclear medicine, both photoelectric and Compton scattering events can be used for image reconstruction. The purpose of our work is to perform simulations for Compton SPECT by using the Geant4 application for tomographic emission (GATE). The performance of Compton SPECT is evaluated and compared with that of conventional SPECT. The Compton SPECT unit has an area of 12 cm 12 cm with four gantry heads. Each head is composed of a 2-cm tungsten collimator and a 4040 array of CdZnTe (CZT) crystals with a 33 mm2 area and a 6-mm thickness. Compton SPECT can use not only the photoelectric effect but also the Compton scattering effect for image reconstruction. The correct sequential order of the interactions used for image reconstruction is determined using the angular resolution measurement (ARM) method and the energies deposited in each detector. In all the results of simulations using spherical volume sources of various diameters, the reconstructed images of Compton SPECT show higher signal-to-noise ratios (SNRs) without degradation of the image resolution when compared to those of conventional SPECT because the effective count for image reconstruction is higher. For a Derenzo-like phantom, the reconstructed images for different modalities are compared by visual inspection and by using their projected histograms in the X-direction of the reconstructed images.