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A Highly Efficient and Fast Algorithm for Implementing a Real-Time Software GNSS Receiver
Sung-Hyuck Im,Gyu-In Jee,Hak-Sun Kim,Sang-Do Cho,Sun-Jun Ko 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
In this paper, for implementing a real-time software GNSS receiver we propose the highly efficient and fast algorithms such as partial down-conversion, phase rotator, composite I&Q accumulation, Virtual DCO technique, and parallel acquisition using FFT. When the proposed algorithms are used, more 30 tracking channels with 3 tracking arm(early-prompt-late) is operated real-time on Intel 2.8GHz personal computer. Also, the partial down-conversion reduces the FFT size, for parallel acquisition, to 1/8 of conventional FFT-size and the program size includes map is not exceed 1Mbyte. Finally, the proposed real-time software GNSS receiver using the proposed algorithms provides the navigation solution with below 10 meter rms error.
( Byoung Hyuck Kim ),( Eui Kyu Chie ),( Kyu Bo Kim ),( Jin Young Jang ),( Sun Whe Kim ),( Sae Won Han ),( Do Youn Oh ),( Seock Ah Im ),( Tae You Kim ),( Yung Jue Bang ),( Sung W Ha ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: To date, there is a paucity of information regarding optimal radiation dose after microscopic positive (R1) resection in patients with extrahepatic bile duct cancer. This study was conducted to evaluate the impact of radiation dose escalation for R1 resection margin (RM). Methods: A retrospective review was performed on 251 patients who underwent curative resection followed by adjuvant chemoradiotherapy between 1995 and 2009. Eighty-six patients had R1 RM which included invasive carcinoma (n=63) and carcinoma in situ/high-grade dysplasia (n=23). Among them, 54 patients received radiation dose < 54 Gy (range, 40-50.4 Gy) and 32 patients received = 54 Gy (range, 54-56 Gy). Concomitant fi uoropyrimidine-based chemotherapy was administered. Acute and late gastrointestinal (GI) toxicity were evaluated using Radiation Therapy Oncology Group criteria. The median follow-up duration was 27 months for all patients and 92 months for survivors. Results: Radiation dose = 54 Gy was associated with improved locoregional control (LRC) (5yr rate, 73.8% vs. 47.1%, p = 0.038), but not disease-free survival (5yr rate, 43.4% vs. 32.6%, p = 0.427) and overall survival (5yr rate, 40.6% vs. 29.6%, p = 0.393). In multivariate analysis for LRC, R1 with invasive carcinoma (HR 3.31, 95% CI 1.11-9.85, p = 0.032) and radiation dose < 54 Gy (HR 3.09, 95% CI 1.14-8.39, p=0.027) were independent adverse prognostic factors. Between the two dose groups, there was no signifi cant difference in acute GI toxicity =grade 2 and in late GI toxicity =grade 3. Conclusions: The current study demonstrated that radiation dose = 54 Gy was associated with improved LRC in patients with R1 RM and also well tolerated. Therefore, dose escalation could be considered for R1 RM. Prospective study is needed to verify these results.
Heo, Jin Hyuck,Shin, Dong Hee,Song, Dae Ho,Kim, Do Hun,Lee, Sang Jin,Im, Sang Hyuk The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.18
<P>Super-flexible bis(trifluoromethanesulfonyl)-amide (TFSA)-doped graphene transparent conducting electrode (GR TCE)-based FAPbI3 − xBrx perovskite solar cells with 18.9% power conversion efficiency (PCE) for a rigid device and 18.3% for a flexible one are demonstrated because the TFSA-doped GR TCE reveals high conductivity and high transmittance. The unencapsulated TFSA-doped GR TCE-based cell maintained ∼95% of its initial PCE under a continuous light soaking of 1 Sun at 60 °C/30% relative humidity for 1000 h. In addition, the TFSA-doped GR TCE-based flexible perovskite solar cells show excellent bending stabilities, maintaining PCEs of ∼85, ∼75, and ∼35% of their original values after 5000 bending cycles, at <I>R</I> = 12, 8, and 4 mm, respectively.</P>
Thermally Stable Inorganic CsPbI<sub>2</sub>Br Mesoscopic Metal Halide Perovskite Solar Submodules
Heo, Jin Hyuck,Kim, Do Hun,Park, Jin Kyoung,Choi, Yong Kyu,Lee, David S.,Im, Sang Hyuk American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.46
<P>Highly efficient and thermally stable inorganic CsPbI<SUB>2</SUB>Br mesoscopic metal halide perovskite (MHP) solar cells with a poly-3-hexylthiophene (P3HT) hole transporting layer (HTL) are demonstrated by spin-washing of the P3HT HTL since the light harvesting efficiency is improved by minimizing the coabsorption of light by P3HT, and the open-circuit voltage is enhanced because of the increased valence band maximum position of the spin-washed P3HT HTL. The spin-washed CsPbI<SUB>2</SUB>Br MHP solar cell exhibited 1.24 V open-circuit voltage (<I>V</I><SUB>oc</SUB>), 14.20 mA/cm<SUP>2</SUP> short-circuit current density (<I>J</I><SUB>sc</SUB>), 81.52% fill factor (FF), and 14.35% power conversion efficiency (PCE). The unencapsulated spin-washed CsPbI<SUB>2</SUB>Br MHP solar cell went through 7.56% degradation after a 1000 h thermal stability test under 100 °C/25% relative humidity (RH) and simultaneous 1 sun light soaking conditions. In addition, the unencapsulated spin-washed CsPbI<SUB>2</SUB>Br MHP solar submodule with 25 cm<SUP>2</SUP> of masked active area showed a 98% geometrical FF, 115.09 mA short-circuit current, 3.54 V <I>V</I><SUB>oc</SUB>, 71.09% FF, and 11.58% PCE while exhibiting 8.80% of degradation during a thermal stability test at 100 °C/25% RH and 1 sun light soaking for 1000 h.</P> [FIG OMISSION]</BR>
Heo, Jin Hyuck,Jang, Min Hyuk,Lee, Min Ho,Shin, Dong Hee,Kim, Do Hun,Moon, Sang Hwa,Kim, Sang Wook,Park, Bum Jun,Im, Sang Hyuk American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.47
<P>High-performance solid-state PbS quantum dot-sensitized solar cells (QD-SSCs) with stable 9.2% power conversion efficiency at 1 Sun condition are demonstrated by introduction of hybrid perovskite interlayer. The PbS QDs formed on mesoscopic TiO2 (mp-TiO2) by spin-assisted successive precipitation and anionic exchange reaction method do not exhibit PbSO4 but have PbSO3 oxidation species. By introducing perovskite interlayer in between mp-TiO2/PbS QDs and poly-3-hexylthiophene, the PbSO3 oxidation species are fully removed in the PbS QDs and thereby the efficiency of PbS QD-SSCs is enhanced over 90% compared to the pristine PbS QD-SSCs.</P>