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Determination of personal PM2.5 exposure using time activity pattern
( Yun Hyung Hwang ),( Jeong Hoon Kim ),( Soog Il Lim ),( Ki Young Lee ),( Tae Hyun Kim ),( Won Ho Yang ),( Seung Do Yu ) 대한보건협회 2013 대한보건협회 보건종합학술대회 Vol.2013 No.-
Background: Exposure to particulate matter less than aerodynamic diameter of 2.5 μm (PM2.5) may be associated with respiratory and cardiovascular effects. Ambient PM2.5 concentrations are poorly correlated with personal exposure since people spend time in various microenvironments. Personal PM2.5 exposures have not been well characterized due to the difficulty of monitoring. Application of portable nephelometer allowed continuous measurement of personal PM exposure. The purpose of this study was to determine impacts of activity pattern and contribution of each microenvironment on personal PM2.5 exposure. Methods: Two non-smoking technicians carried a nephelometer (Sidepak, TSI) for three different days while simulating activity patterns of 10 different population groups. The 10 groups were classified by time activity patterns of 2358 population in Seoul, Korea. The Sidepak was set to measure PM2.5 with 3-min logging interval and the time-activity diary was recorded with characteristics of microenvironments. The population proportion staying in each location multiplied by its residential time was calculated to determine contribution of each microenvironment. Results: The mean PM2.5 personal exposure was 19.8 μg/m3. The average exposure of each population group was ranged from 9.8 μg/m3 to 43.1 μg/m3. High peak and average concentrations were observed when the persons stayed in restaurants and bars. Such high concentrations were due to secondhand smoke and cooking with charcoal on table. Residential indoor level had the largest contribution to personal exposure, although residential PM2.5 concentrations were relatively low. The contributions from residence, restaurant, office, transportation and outdoor were 36.2%, 26.0%, 16.6%, 6.7% and 3.7% respectively. Conclusion: The various contributions of microenvironment suggested that personal exposure can be affected by activity pattern.
Yun, Jong-Won,Song, Seung-Koo The Korean Society for Biotechnology and Bioengine 1996 Biotechnology and Bioprocess Engineering Vol.1 No.1
A continuous production of fructooligosaccharides from sucrose was investigated by fructosyltransferase immobilized on a high porous resin, Diaion HPA25. The optimum pH(5.5) and temperature(55$^{\circ}C$) of the enzyme for activity was unaltered by immobilization, and the immobilized enzyme became less sensitive to the pH change. The optimal operation conditions of the immobilized enzyme column for maximizing the productivity were as follows: 600g/L of sucrose feed concentration, flow rate of superficial space velocity 2.7h-1. When the enzyme column was run at 50$^{\circ}C$, about 8% loss of the initial activity of immobilized enzyme was observed after 30 days of continuous operation, during which high productivity of 1174g/L$.$h was achieved. The kinds of products obtained using the immobilized enzyme were almost the same as those using soluble enzymes or free cells.
Design of Multiband Maritime Network for Ships and its Applications
Yun, Chang-Ho,Cho, A-Ra,Kim, Seung-Geun,Park, Jong-Won,Lim, Yong-Kon The Korea Institute of Information and Commucation 2009 Journal of information and communication convergen Vol.7 No.3
Nowadays, maritime communication systems need high data rate, reliability, and consistency in order to equivalently provide navigating ships with diverse multimedia services as in terrestrial communication systems. For this purpose, we conceptualize and design the maritime network for ships equipped with a multiband communication system which cost-effectively supports multimedia services according to several radiofrequency bands, such as HF, VHF, and satellite frequencies. We also introduce two service scenarios targeted for the maritime network; ship multimedia service (SMS) and real-time maritime logistics location tracking (RML2T). In addition, we specify related works according to three lower network layers (i.e., physical, data-link, and network layers) upon designing the network.
Comparisons of Expression Level of Lentinula edodes β-Glucan Gene According to the Growth Conditions
Seung-Bin Im,Neul-i Ha,Seong-Woo Jin,Kyung-Je Kim,Young-Woo Koh,Hee-Kyung Jeong,Seung-Ju Kim,Kyong-Won Yun,Ki-Man Kim,Yu-Jin Choi,Da-Hye Song,Kyoung Sun Seo 한국식품영양과학회 2020 한국식품영양과학회 학술대회발표집 Vol.2020 No.10
Recipient S-CSCF Assured (RSA) Session Transfer for IMS based NGN
Yun, Chang-Ho,Cho, A-Ra,Kim, Seung-Geun,Park, Jong-Won,Lim, Yong-Kon The Korea Institute of Information and Commucation 2010 Journal of information and communication convergen Vol.8 No.4
A session transfer method, referred to as a Recipient Serving-call session control function (S-CSCF) Assured (RSA), is proposed in order to support both session mobility and consistency in IP multimedia subsystem (IMS) based next generation network (NGN). RSA session transfer simplifies a basic session transfer operation specified in [1] by using the user agent client (UAC) like characteristics of an S-CSCF. To show its efficiency, the session transfer delay and the traffic cost of RSA session transfer are investigated and compared with those of existing session transfer applications, including Assured and Consultative session transfers, by practically considering multiple session transfer failures. It is shown that RSA session transfer can further improve user experience by reducing session transfer delay as well as traffic cost than Assured and Consultative session transfers.
Production of Inulo-Oligosaccharides from Inulin by Immobilized Endoinulinase from Pseudomonas sp.
YUN, JONG WON,KIM, DONG HYUN,KIM, BYUNG WOO,SONG, SEUNG KOO 동의대학교 기초과학연구소 1998 基礎科學硏究論文集 Vol.8 No.1
Continuous production of inulo-oligosaccharides from pure inulin was conducted using an immobilized endoinulinase reactor. The optimal operating conditions of the reactor for maximizing the productivity were as follows: 50g/ℓ of inulin feed concentration, flow rate as superficial space velocity 1.1 h^-1, and temperature 55℃. The enzyme reactor was run for 15 d at 55℃ achieving an oligosaccharide yield of 83% without any significant loss of initial enzyme activity, during which the volumetric productivity was 55g/ℓh and half life of the immobilized enzyme indicated 35d.
Seung Chan Park,Tuy An Trinh,Won-Yung Lee,Ji Yun Baek,Seung Yong Lee,Kyu Hee Choi,Jaewon Ha,Chang-Eop Kim,Ki Sung Kang,Hye Lim Lee 한국한의학연구원 2021 Integrative Medicine Research Vol.10 No.3
Background: This study aimed at determining the effect of the herbal mixture estrogen inhibition formula (EIF) and its possible mechanisms by precocious puberty animal models and network pharmacology-based analysis. Methods: Precocious puberty animal models were established by a single injection of 300 μg danazol, then female rats were administered EIF, vaginal openings were monitored, uterus and pituitary indices were determined. The levels of ALP, E2, LH, and FSH were measured using ELISA kits. Real-time PCR was performed to evaluate the mRNA expression of GnRH, UNC5C, and netrin-1 in hypothalamic tissues. We applied network pharmacological analysis to predict potential targets and pathways of EIF. Results: EIF delayed danazol-induced early vaginal opening. In the onset model, EIF reduced the increased levels of serum ALP, E2, LH, and FSH; as well as mRNA expressions of GnRH, Netrin-1, and UNC5C. Moreover, long-term administration of EIF not only diminished all impaired factors but also had no effect on the normal development of the animals. The gene set enrichment analysis showed that the targets of EIF are mainly associated with the GnRH signaling and ovarian steroidogenesis pathways. Conclusion: EIF could be used in preclinical research for the treatment of precocious puberty by the inhibition of HPGA pre-maturation.
( Seung Woong Lee ),( Ja Gyeong Song ),( Byung Soon Hwang ),( Dae Won Kim ),( Yoon Ju Lee ),( E Eum Woo ),( Ji Yul Kim ),( In Kyoung Lee ),( Bong Sik Yun ) 한국균학회 2014 韓國菌學會誌 Vol.42 No.2
We investigated a total of 335 samples of Korean native mushroom extracts as part of our lipoxygenase (LOX) inhibitor screening program. Among the mushroom-methanolic extracts we investigated, 35 exhibited an inhibitory activity greater than 30% against LOX at a concentration of 100 μg/mL. Especially, Collybia maculata, Tylopilus neofelleus, Strobilomyces confusus, Phellinus gilvus, P. linteus, P. baumii, and Inonotus mikadoi exhibited relatively potent LOX inhibitory activities of 73.3%, 51.6%, 52.4%, 66.7%, 59.5%, 100.0%, and 85.2%, respectively. Bioassay-guided fractionation led to the isolation of inoscavin A from the methanolic extract of P. baumii, which showed the most potent activity and was identified by spectroscopic methods. Specifically, inoscavin A exhibited potent LOX inhibitory activity with an IC50 value of 6.8 μM.
( Seung Won Ra ),( Sun Young Kim ),( Yun Young Lim ),( Shin Jung Park ),( Chin Kook Rhee ),( Deog Kyeom Kim ),( Yong Bum Park ),( Chang Youl Lee ),( Hyoung Kyu Yoon ),( Jeong-woong Park ),( Kwang Ha Y 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Background Botanical medicines used as expectorants and antitussives have proven to be effective while also having excellent safety margins. We aimed at evaluating the efficacy and safety of a new botanical drug, CKD-497, in patients with acute upper respiratory tract infections and bronchitis. Methods In this phase 2 study, 225 patients were enrolled and randomly assigned to one of four treatment groups: placebo (n=55), Synatura® (n=49), CKD-497 200mg (n=68), or CKD-497 300mg (n=53). The study drugs were administered three times daily over the course of 7 days. Primary endpoint was the change in the bronchitis severity score (BSS) from baseline to day 7. Secondary endpoint was evaluated based on clinical response rates on days 4 and 7. A safety analysis was also performed. The Kruskal-Wallis test for intergroup differences and a Chi-square test were applied. Results Between baseline and day 7, the mean BSS scores decreased significantly in each group (P<0.001): 4.04±1.85, 4.31±1.47, 4.09±1.48, and 4.28±1.69. However, neither the CKD-497 nor Synatura® group showed any significant effect on the difference in BSS change (P=0.75). The rate of clinical response was higher in the CKD-497 300mg group as compared to the placebo only on day 4 (18% vs. 36%; P<0.05) and those having more severe bronchitis (phlegm score≥3) showed a significant reduction of total BSS in the Synatura® and CKD-497 groups (P=0.042). No significant adverse events were observed in either of the CKD-497 groups. Conclusion CKD-497 and even the positive control drug had no significant effect on BSS change in this phase 2 clinical trial. However, CKD- 497 300mg had a mild but significant clinical improvement in early bronchitis patients with more severe phlegm. Considering both efficacy and safety, a future study using 300mg of CKD-497 with a shorter-term endpoint is warranted in patients with more severe bronchitis symptoms.