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( Minjae Park ),( Horim Kim ),( Young Su Lee ),( Hyeri Jo ),( Xin Zhao ),( Jae Young Kim ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
Nitrogen oxides (NO<sub>X</sub>) are air pollutants that cause respiratory and cardiovascular diseases which are mainly produced by the combustion process of power plants, incinerators, and automobiles. Selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) are well-known methodologies of reducing nitrogen oxides to nitrogen by ammonia. Anhydrous ammonia (NH<sub>3</sub>, l), ammonia solution (NH<sub>3</sub>, aq), and urea solution (NH<sub>2</sub>CONH<sub>2</sub>, aq) are conventional reductants of SCR and SNCR. Anhydrous ammonia and ammonia solution are highly corrosive resulting high risk of storage and transportation. Compared to the previous two reductants, urea solution is much safer and therefore generally applied to SCR of various systems. To convert urea into ammonia, urea solution requires a pyrolysis process with a temperature of 400℃. Still, the conversion rate of urea solution is low because of by-products produced by complicated reactions. Recently, ammonium carbonate, which decomposes completely into ammonia at 58℃, is being studied as a reductant of SCR and SNCR. However, ammonium carbonate is much more expensive than urea. In this study, to take advantage of both urea and ammonium carbonate, the synergy effect of urea and ammonium carbonate was investigated by comparing the concentration of produced ammonia. Three types of solutions, 4 wt. % urea solution, 2 wt. % ammonium carbonate solution, and a mixture of 4 wt.% urea and 2 wt.% ammonium carbonate solution, were thermally decomposed in a tube furnace. The pyrolysis was performed at a temperature of 200, 300, 350, 400, and 500°C with a residence time of 2 seconds. The produced gas was dissolved into 250 ml of distilled water inside the impinger using air as carrier gas. Ammonia concentration was measured with the Nessler method and UV-Visible Spectrophotometer. This study investigated the synergy effect of urea and ammonium carbonate and how the synergy effect varies depending on the pyrolysis conditions.
Minjae Lee,Sung Gyun Shin,Seungsoo Jang,Woosung Cho,Sungkyum Kim,Chanho Choi,Jooyeon Kim,Sangsoo Han,Song Hyun Kim,Youngmin Kim 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.5
Most vision-based landing algorithms cannot be applied in a severe vision-detection environment. However, the application of a deep learning technique to vision-based landing algorithm can solve the problem of a severe vision-detection environment, especially in vision-impaired environments. Based on this fact, a novel-landing concept with deep learning technique is proposed in this study. Three main techniques applied for guided landing are 1) deep learning for accurate landing mark detection; 2) location-memorized system for coping temporal failure of the landing mark detection; 3) Unmanned Aerial Vehicle control algorithm for vibration minimization in vision sensor. The proposed system successfully and accurately guided the multicopter onto the landing area without failure in vision-impaired environments. The results show that the proposed landing algorithm can overcome environmental restrictions in operating multicopters.
Minjae Kim,Shin Hwang,Chul-Soo Ahn,Ki-Hun Kim,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Seung-Mo Hong 대한외과학회 2021 Annals of Surgical Treatment and Research(ASRT) Vol.100 No.5
Purpose: Combined hepatocellular carcinoma and cholangiocarcinoma (cHCC-CC) has wide histologic diversity. This study investigated the effects of cHCC-CC histology, according to the 2010 World Health Organization (WHO) classification, on patient prognosis. Methods: The medical records of patients who underwent surgical resection for cHCC-CC at our institution between July 2012 and June 2019 were retrospectively evaluated. Results: During the study period, 168 patients, 122 males (72.6%) and 46 females (27.4%), underwent surgical resection for cHCC-CC, including 159 patients (94.6%) who underwent R0 resection. Mean tumor diameter was 4.4 ± 2.8 cm, and 161 patients (95.8%) had solitary tumors. Histologically, 86 patients (51.2%) had classical type, and 82 (48.8%) had tumors with stem cell (SC) features, including 33 (19.6%) with intermediate-cell and 23 (13.7%) each with typical SC and cholangiolocellular features; 3 tumors (1.8%) were unclassifiable. At 1, 3, and 5 years, tumor recurrence rates were 31.9%, 49.6%, and 58.1%, respectively, and patient survival rates were 91.0%, 70.2%, and 60.3%, respectively. Univariate analysis showed that tumor size of >5 cm, microscopic and macroscopic vascular invasion, lymph node metastasis, 8th edition of the American Joint Committee on Cancer (AJCC) tumor stage, and 2010 WHO classification were significantly prognostic. Multivariate analysis showed that the 8th AJCC tumor stage and 2010 WHO histologic classification were independently prognostic for tumor recurrence and patient survival. There were no significant prognostic differences among the 3 SC subtypes. Conclusion: Postresection outcomes are better in patients with SC-type than with classical-type cHCC-CC.
Code Division Multiplexing based MIMO Channel Sounder Architecture utilizing Chaotic Sequence
Minjae Kim,Hyoungsuk Jeon,Heung-Ryeol You,Hyuckjae Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we propose a novel MIMO channel sounding architecture by using chaotic sequence instead of PN sequence in conventional sounder.