Kim, JongSu;Choi, SeukCheun;Jeong, SooHwa;Mock, ChinSung;Kim, DooBoem
Clean Technology
/
v.28
no.2
/
pp.131-137
/
2022
The semiconductor process currently emits various by-products and unused gases. Emissions containing pollutants are generally classified into categories such as organic, acid, alkali, thermal, and cabinet exhaust. They are discharged after treatment in an atmospheric prevention facility suitable for each exhaust type. The main components of organic exhaust are volatile organic compounds (VOC), which is a generic term for oxygen-containing hydrocarbons, sulfur-containing hydrocarbons, and volatile hydrocarbons, while the main components of alkali exhaust include ammonia and tetramethylammonium hydroxide. The purpose of this study was to determine the combustion characteristics and analyze the NOX reduction rate by maintaining a direct combustion and temperature to process organic and alkaline exhaust gases simultaneously. Acetone, isopropyl alcohol (IPA), and propylene glycol methyl ether acetate (PGMEA) were used as VOCs and ammonia was used as an alkali exhaust material. Independent and VOC-ammonia mixture combustion tests were conducted for each material. The combustion tests for the VOCs confirmed that complete combustion occurred at an equivalence ratio of 1.4. In the ammonia combustion test, the NOX concentration decreased at a lower equivalence ratio. In the co-combustion of VOC and ammonia, NO was dominant in the NOX emission while NO2 was detected at approximately 10 ppm. Overall, the concentration of nitrogen oxide decreased due to the activation of the oxidation reaction as the reaction temperature increased. On the other hand, the concentration of carbon dioxide increased. Flameless combustion with an electric heat source achieved successful combustion of VOC and ammonia. This technology is expected to have advantages in cost and compactness compared to existing organic and alkaline treatment systems applied separately.
Seol, Soo Young;Jeong, Myung Ho;Lee, Seung Hun;Sohn, Seok-Joon;Cho, Jae Yeong;Kim, Min Chul;Sim, Doo Sun;Hong, Young Joon;Park, Hyung Wook;Kim, Ju Han;Ahn, Youngkeun;Cho, Jeong Gwan;Park, Jong Chun
The Korean Journal of Medicine
/
v.94
no.1
/
pp.96-106
/
2019
Background/Aims: It is well known that gender differences are associated with clinical outcomes in patients with acute myocardial infarction (AMI). However, it is not clear whether gender differences affect the prognosis of elderly patients with AMI. Methods: We analyzed the incidence of in-hospital complications and mortality in the Korea Acute Myocardial Infarction Registry-National Institutes of Health from November 2011 to June 2015. This study included elderly patients (≥ 75 years) diagnosed with AMI. Results: A total of 2,953 patients were eligible for this study. Among them, 1,529 (51.8%) patients were female, and the mean age of the female group was older than that of the male group (80.7 ± 4.4 vs. 79.6 ± 4.0 years, respectively, p < 0.001). Elderly females utilized emergency medical services less frequently compared with elderly males (11.5 vs. 15.4%, respectively, p < 0.001). Elderly female AMI patients had a similar rate of in-hospital mortality compared with elderly males (7.1 vs. 8.4%, respectively, p = 0.196). The rate of major cardiac adverse events (MACEs) was lower in elderly females than males during a 12-month follow-up (hazard ratio [HR] 1.19, 95% confidence interval [CI] 1.00-1.41, p = 0.045). According to multivariate analysis, the male gender is an independent factor for predicting 1-year MACEs (HR 1.37, 95% CI 1.14-1.65, p < 0.001). Conclusions: No significant differences in peri-procedural complications or in-hospital mortality were observed between male and female elderly patients with AMI. However, elderly female patients had a more favorable prognosis than male patients during a 1-year clinical follow-up.
Jeung Jae Yeal;Milton Donald K.;Kim Tae Hyeung;Lee Jong Young;Jahng Doo Sub;Kang Sung He;Song Young Sun;Lee Ki Nam
Journal of Physiology & Pathology in Korean Medicine
/
v.16
no.5
/
pp.1035-1041
/
2002
Ultrasonic nebulizer with the application of new engineering methodology and the design of electronic circuit and 766ppm Cd nebulizing solution were used to generate cadmium aerosol for inhalation toxicology study. The results of particle size analysis for cadmium aerosol were as following. The highest particle counting for source temperature 20℃ was 43.449 x 10³ in inlet temperature 250℃ and particle diameter 0.75㎛. The highest particle counting for source temperature 50℃ was 43.211 x 10³ in inlet temperature 100 ℃ and particle diameter 0.75㎛. The highest particle counting for source temperature 70℃ was 41.917x10³ in inlet temperature 250℃ and particle diameter 0.75㎛. The ranges of geometric mean diameter(GMD) were 0.677-1.009㎛ in source temperature 20℃, 0.716-0.963㎛ in source temperature 50℃, and 0.724-0.957㎛ in source temperature 70℃. The smallest GMD was 0.677㎛ in source temperature 20℃ and inlet temperature 20℃. and the largest GMD was 1.009㎛ in source temperature 20℃ and inlet temperature 20℃. The ranges of geometric standard deviation(GSD) were 1.635-2.101 in source temperature 20℃. 1.676-2.073 in source temperature 50℃, and 1.687-2.051 in source temperature 70℃. The lowest GSD was 1.635 in source temperature 20℃ and inlet temperature 20℃, and the highest GSD was 2.101 in source temperature 20℃ and inlet temperature 200℃. Aerosol generated for cadmium inhalation toxicology study was polydisperse aerosol. The ranges of mass median diameter(MMD) were 1.399-5.270㎛ in source temperature 20℃. 1.593-4.742㎛ in source temperature 50℃, and 1.644-4.504㎛ in source temperature 70℃. The smallest MMD was 1.399㎛ in source temperature 20℃ and inlet temperature 20℃, and the largest MMD was 5.270㎛ in source temperature 20℃ and inlet temperature 200℃. Increasing trends for GMD, GSD, and MMD were observed with same source temperature and increase of inlet temperature. MMD for inhalation toxicology testing in EPA guidance is less than 4㎛. In our results. inlet temperature 20 and 50℃ in source temperature 20℃, and inlet temperature 20 to 150℃ in source temperature 50 and 70℃ were conformed to the EPA guidance. MMD for inhalation toxicology testing in OECD and EU is less than 3㎛. In our results, inlet temperature 20 and 50℃ in source temperature 20, 50, and 70℃ were conformed to the OECD and EU guidance.
To investigate the effect of continual pre-plant application of liquid pig manure (LPM) on malting barley growth, quality and soil environment in double cropping system of rice and malting barley, the liquid pig manure was applied after harvesting rice and malting barley for 3 years. Field experiment was designed with non-fertilizer, chemical fertilizer (CF) recommended by soil testing, rice (LPM 50%+CF 50%)+malting barley (CF 100%), rice (LPM 50%+CF 50%)+malting barley (LPM 50%+CF 50%), rice (LPM 100%)+malting barley (CF 100%) and rice (LPM 100%)+malting barley (LPM 100%). By continuous application of LPM 100%, the contents of available $P_2O_5$ and exchangeable K in the soil were increased. The available $P_2O_5$ increased from 243 to 350 mg $kg^{-1}$ and exchangeable K was changed 0.31 to 0.44 $cmol_{c}\;kg^{-1}$. However, the contents of available $P_2O_5$ and exchangeable K were not significant changes in rice (LPM 50%+CF 50%)+malting barley (LPM 50%+CF 50%) plot. Bulk density of soil was not affected by application of LPM. The microbial density was high in order of bacteria > actinomycetes > fungi. The population of aerobic bacteria in rice (LPM 100%)+malting barley (LPM 100%) plot was higher than other plots. The ratio of aerobic bacteria/fungi and biomass C content were the highest in rice (LPM 100%)+malting barley (LPM 100%) plot. The yield of malting barley was increased 22% by increasing culm length, panicle length, No. of panicle and 1,000 grains as 358 kg $10a^{-1}$ in rice (LPM 100%)+malting barley (LPM 100%) plot compared with 294 kg $10a^{-1}$ in rice (CF 100%)+malting barley (CF 100%) plot. The content of ${\beta}$-glucan was low by 4.5 and 4.4% in non-fertilizer and rice (CF 100%)+malting barley (CF 100%) plot, respectively. The content of crude protein was the lowest by 8.2% in non-fertilizer and rice (CF 100%)+malting barley (CF 100%) plot and the quality of malting barley was good as within 11%.
Kim, Eun Sook;Jang, Yo Jong;Park, Ji Yeon;Kang, Dong Yun;Yeom, Doo Seok
The Journal of Korean Society for Radiation Therapy
/
v.25
no.2
/
pp.107-113
/
2013
Purpose: To verify accuracy of respiratory gated proton therapy by measuring and analyzing proton beam delivered when respiratory gated proton therapy is being performed in our institute. Materials and Methods: The plan data of 3 patients who took respiratory gated proton therapy were used to deliver proton beam from proton therapy system. The manufactured moving phantom was used to apply respiratory gating system to reproduce proton beam which was partially irradiated. The key characteristics of proton beam, range, spreat-out Bragg peak (SOBP) and output factor were measured 5 times and the same categories were measured in the continuous proton beam which was not performed with respiratory gating system. Multi-layer ionization chamber was used to measure range and SOBP, and Scanditronix Wellhofer and farmer chamber was used to measure output factor. Results: The average ranges of 3 patients (A, B, C), who had taken respiratory gated proton therapy or not, were (A) 7.226, 7.230, (B) 12.216, 12.220 and (C) 19.918, 19.920 $g/cm^2$ and average SOBP were (A) 4.950, 4.940, (B) 6.496, 6.512 and (C) 8.486, 8.490 $g/cm^2$. And average output factor were (A) 0.985, 0.984 (B) 1.026, 1.027 and (C) 1.138, 1.136 cGy/MU. The differences of average range were -0.004, -0.004, -0.002 $g/cm^2$, that of SOBP were 0.010, -0.016, -0.004 $g/cm^2$ and that of output factor were 0.001, -0.001, 0.002 cGy/MU. Conclusion: It is observed that the range, SOBP and output factor of proton beam delivered when respiratory gated proton therapy is being performed have the same beam quality with no significant difference compared to the proton beam which was continuously irradiated. Therefore, this study verified the quality of proton beam delivered when respiratory gated proton therapy and confirmed the accuracy of proton therapy using this.
Kim, Youn Young;Youm, Doo Seok;Jang, Yo Jong;Kang, Dong Yun;Park, Jeong Hoon
The Journal of Korean Society for Radiation Therapy
/
v.25
no.2
/
pp.153-158
/
2013
Purpose: After making two plans, the Double Scattering (DS) Mode and The Pencil Beam Scanning (PBS) Mode, of patients on early prostate cancer, we not only compare the dose conformity and the dose homogeneity by analyzing each DVH, CN and HI, but also evaluate normal structures's sparing effect on each mode. Materials and Methods: Planes about nine patients, who did proton therapy, on prostate cancer was setted using the Eclipse proton external beam planning system. The prescription dose, every $2.5 Gy{\times}28$ fractions=70 Gy, was delivered to the PTV. The CN and the HI were getted by anlazing each DVHs for the DS Plan and the PBS Plan. Also, normal structures' %volumes according to dose of the PBS are campared with those of the DS. Results: The average CN of the PTV is increase 16.63% from DS $0.68{\pm}0.07$ to PBS $0.79{\pm}0.01$, and the average IN of the PTV is decrease -22.66 % from DS $0.12{\pm}0.03$ to PBS $0.09{\pm}0.01$. The PBS has litter %Volumes of normal structures than the DS about every patient except Rectum. The average %Volume of Left Femoral Head receiving ${\geq}30$ Gy shows most high decreasing rate, -79.93%, from DS to PBS and the average %Volume of Rectum receiving ${\geq}70$ Gy shows most low decreasing rate, -3.03%, from DS to PBS. Conclusion: Therefore, the PBS is more effective achieving the dose conformity and the dose Homogeneity than DS, and better to reduce unnecessary dose arriving normal structures, especially the femoral heads.
Purpose: Anhedonia has been proposed to be the result of a basic neurophysiologic dysfunction and a vulnerability marker that precede and contribute to the liability of developing schizophrenia. We hypothesized that anhedonia, as a construct reflecting the decreased capacity to experience pleasure, should be associated with decreased positive hedonic affect trait. This study examined the relationship between anhedonia and positive hedonic affect trait and searched for the brain legions which correlate with anhedonia in normal subjects. Materials and Methods: Using $^{18}F$-FDG PET scan, we investigated the brain activity of twenty one subjects during resting state. Questionnaires were administrated after the scan in order to assess the self-rated individual differences in physical/social anhedonia and positive/negative affect traits. Results: Negative correlation between physical anhedonia score and positive affect trait score was significant (Pearson coefficient =-0.440, p<0.05). The subjects physical and social anhedonia scores showed positive correlation with metabolic rates in the cerebellum and negative correlation with metabolic rates in the inferior temporal gyrus and middie frontal gyrus. In addition, the positive affect trait score positively correlated with various areas, most prominent with the inferior temporal gyrus. Conclusion: These results suggest that neural substrates, such as the inferior temporal gyrus and prefrontal-cerebellar circuit, which dysfunction has been proposed to be involved with the cognitive deficits of schizophrenia, may also play a significant role in the liability of affective deficits like anhedonia.
To reveal the association between blood selenium level and the gastric diseases, 180 persons received the gastrofiberscopic examination at the outpatients department of the two university hospitals from July to September 1987, after the exclusion of the persons having the esophageal varix, were randomly selected. Their general characteristics such as age, sex and educational level and so on, were inverstigated. Five mi venous blood was collected from each subjects and stored at $0^{\circ}C$ in heparinized vaccum tube. The blood selenium level was measured by the flameless atomic absorption spectrophotometry. In the procedure of data analysis, five subjects having benign tumor and anomaly of the stomach, were also excluded. The mean blood selenium levels of the $155.5{\mu}g/{\ell}$ among gastritis cases, the $154.8{\mu}g/{\ell}$ gastric ulcer and the $133.0{\mu}g/{\ell}$ gastric malignancy were significantly lower(p<0.05) than that of the $173.3{\mu}g/{\ell}$ among normal controls. In men the mean blood selenium levels .among gastritis, gastric ulcer and gastric malignancy cases were significantly lower(p<0.05) than that among normal controls. In females, the mean blood selenium levels among gastritis and gastric maligancy cases were significantly lower(p<0.05) than that among normal controls($169.7{\mu}g/{\ell}$), but that among gastric ulcer cases($177.7{\mu}g/{\ell}$) was not significantly higher. In the logistic analysis, coefficient of the blood selenium level was -0.0436(p<0.05 : odds ratio 0.957) for gastritis, -0.0197(p=0.17 : 0.981) for gastric ulcer, -0.4876(p<0.05 : 0.614) for gastric malignancy and -0.0411(p<0.05 ; 0.960) for gastric diseases including the gastritis, the gastric ulcer and the gastric malignancy. These data support the hypothesis that the gastric diseases are to be associated with the low selenium level but, for the gastric ulcer, the further research is recommended.
Chang Yun Hee;Lee Sang Kwon;Lee Hyung Doo;Kim Siho;Yie Kilsoo;Woo Jong Soo;Lee Young Seok;Sung Si Chan
Journal of Chest Surgery
/
v.38
no.4
s.249
/
pp.291-300
/
2005
One-stage repair of aortic arch anomalies and intracardiac defects through median sternotomy has been recently adopted by many institutions since it is known to be safer than the staged repair. The early and midterm results of the one-stage repair of aortic arch anomalies and intracardiac defects were retrospectively evaluated. Material and Method: 45 patients who underwent one-stage repair of aortic arch anomalies and intracardiac defects performed by one surgeon from January 1996 to July 2003 were included in this retrospective study. The median age of repair was 16 days (range, 3 days$\~$23.7 months) and the mean weight was $3.62\;\pm\;1.30 kg$. Thirty one $(68.9\%)$ had coarctation and 14 $(31.1\%)$ had interrupted aortic arch. Associated intracardiac anomalies were VSD in 31 patients (VSD group), TGA or Taussig-Bing anomaly in 10 (TGA group), and others in 4 (ASD in 1, aortopulmonary window 1, truncus arteriosus 1, aortic and mitral stenoses 1, miscellaneous group). The arch obstruction was repaired with end-to-side anastomosis in 23 patients and end-to-end anastomosis in 22. Result: Overall postoperative hospital mortality was $22.2\%\;(10/45);\;16.1\%$ (5/31) in VSD group, $40\%$ (4/10) in TGA group, and$25\%$ (1/4) in miscellaneous group. There was no mortality in VSD group since 1998, and the mortality in TGA group has remarkably reduced since technical modification for coronary transfer was adopted $(75\%\;vs\;16.7\%)$. There was no postoperative seizure or other neurological complications. Postoperative aortic restenosis occurred in 5 patients $(5/35,\;14.3\%)$. Two patients underwent balloon aortoplasty with successful results. There was no reoperation. There was one late death caused by pneumonia 5 months after the operation. Two-year actuarial survival rate including operative death was $72.9\%$. Conclusion: The operative mortality of one-stage repair has been reduced with time and aortic restenosis rate was also acceptable. We concluded that this procedure is a reproducible procedure for aortic arch anomalies associated with intracardiac defects.
Kim, Tae-Sung;Yun, Mi-Jin;Cho, Arthur;Lee, Jong-Doo
Nuclear Medicine and Molecular Imaging
/
v.41
no.1
/
pp.22-29
/
2007
Purpose: Metastatic thyroid cancers with I-131 uptake have been known to show no increase of FDG uptake whereas those without I-131 uptake tend to demonstrate increased uptake on PET. In this study, we evaluated the degree of FDG uptake in primary thyroid cancers of papillary histology before surgery. Material & Methods: Forty FDG PET studies were performed on the patients who had papillary cancer proven by fine needle aspiration. The degree of FDG uptake was visually categorized as positive or negative (positive if the tumor showed discernible FDG; negative if the tumor didn't) and the peak standard uptake value (peak SUV) of the papillary thyroid cancer (PTC) were compared with the size of PTC. Results: The mean size of 26 PTC with positive FDG uptake was $1.9{\pm}1.4\;cm(0.5{\sim}5\;cm)$. In 13 PTC with negative FDG uptake, the mean size of those was $0.5{\pm}0.2\;cm\;(0.2{\sim}0.9\;cm)$. All PTC larger than 1cm ($2.5{\pm}1.4\;cm,\;1{\sim}5\;cm$) have positive FDG uptake (peak $SUV=6.4{\pm}5.7,\;1.7{\sim}22.7$). Among the micropapillary thyroid cancer (microPTC; PTC smaller than 1cm), 8 microPTC show positive FDG uptake(peak $SUV=2.9{\pm}1.3,\;1.7{\sim}5.5$), while 13 microPTC show negative finding(peak $SUV=1.3{\pm}0.2,\;1.1{\sim}1.7$). The size of microPTC with positive FDG uptake is significantly larger than that of microPTC with negative FDG uptake ($0.7{\pm}0.1\;cm$ vs $0.4{\pm}0.2\;cm$, p=0.01). Conclusion: All PTCs larger than 1cm show positive FDG uptake in our study. In other words, thyroid lesions larger than 1cm with negative FDG uptake are unlikely to be PTC. So far, only poorly differentiated thyroid cancers are known to show increased FDG uptake. Our results seem to be contradictory to what is known in the literature. Further study is needed to understand better the significance of increased FDG uptake in PTC in relation to expression of NIS and GLUT.
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