Treatment of Radioactive Liquid Waste by the Forced-AirCirculation System

Tae-κuk Kim,IL Sik Kang,Jong-Sik Shon,Young-Gerl Ryu,Won-Hyuk Jang,Sang-Min Bae,Young-Yong Ji,Dae-Seok Hong,Kyung-Kil Kwak 한국방사성폐기물학회 2011 한국방사성폐기물학회 학술논문요약집 Vol.9 No.2

동북아 피더네트워크의 Win-win전략에 관한 연구

장우준(Woo-jun jang),전찬용(Chan-Yong jeon),김태원(Tae-Won Kim),곽규석(Kyu-Seok Kwak),남기찬(Ki-Chan Nam) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1

최근 중국은 양산항을 개장하여 선사 유치를 위한 다양한 혜택을 제공하고, 일본은 "수퍼중추항만 육성계획“을 세워 항만의 효율성을 바탕으로 비용을 낮추려는 노력을 하고 있다. 또한 선박의 대형화에 의한 중심항만(Hub Port) 위주의 기항과 북중국의 대량 물량 발생지역에 대한 직기항 경향으로 동북아 항만간의 경쟁이 더욱더 치열해 지고 있으며 동북아 역내 피더네트워크 강화의 필요성이 제기되고 있다. 따라서, 본 연구에서는 유럽 피더네트워크 전략 사례를 바탕으로 동북아 피더시장 현황을 파악하고 동북아 피더네트워크 구조를 분석함으로써 동북아 역내 항만 및 선사간의 과당경쟁을 지양하고 서로 Win-Win할 수 있는 터미널의 전략적 활용, 선사간 제휴 확대, 항만간 협력 강화를 위한 구체적인 전략을 제시하였다. Recently, China opened Yangshan port and provides a variety of benefits for shipping companies. Japan plans to reduce logistics costs and improve efficiency through the established "super major ports" project. According to the "hub and spokes" system, the number of direct calls toward North-Chinese ports are increasing. This changing environment has negative effects on the amount of transshipment cargos in Korean ports. In order to make a hub port of a domestic port, it is necessary to develop northeast Asian feeder networks. Therefore, this paper analyzes the structure of northeast Asian feeder networks through the case study of European feeder networks strategy. Finally, we suggests the plans to reinforce feeder networks, which are strategic terminal operation, strategic alliances between shipping companies and port co-operation, for win-win strategy in the competitive northeast Asian market.

MLAT 지상 위치정확도 시험에 대한 성능 분석

구본수,장재원,김우리얼,김태식,Koo, Bon-soo,Jang, Jae-won,Kim, Woo-riul,Kim, Tae-sik 한국항행학회 2017 韓國航行學會論文誌 Vol.21 No.4

GPS 안전성에 대한 문제가 제기 되면서 ADS-B 대안 기술로 다변측정감시(MLAT; multilatration)시스템이 각광 받고 있다. MLAT는 항공기에 탑재된 트랜스폰더에서 송출되는 Mode A,C,S는 물론 1090ES(ADS-B) 신호를 지상의 여러 개의 수신기로 수신하여 항공기를 탐지하고 위치를 계산하며, GPS를 이용하는 ADS-B 수준의 위치 정밀도를 갖고 있으면서도 ADS-B와 달리 독립적으로 표적 위치를 계산 할 수 있다. 전 세계적인 환경변화에 따라 우리나라에서도 공항지역 이동차량 및 항공기 감시용으로 지역다변측정(LAM; local area multilateration)감시 시스템 개발 하고 있다. LAM시스템에 대한 지상 필드 시험을 태안 비행장에서 진행하고 있다. 본 논문에서는 태안 비행장에서 필드 시험 중인 MLAT의 위치 정확도를 확인하기 위하여, 지상에서 고정된 타겟과 움직이는 타겟에 대하여 MLAT 트렌스폰더와 RTK Rover를 설치하여 MLAT의 위치 정보와 RTK의 위치정보를 확인하여, RTK에서 보정된 위치 정보와 MLAT에서 계산되어진 위치정보를 비교하여 성능을 분석 하였다. As a GPS stability problem arises, MLAT system is spotlighted as an alternative technology of ADS-B. MLAT system has a high position accuracy as much as ADS-B. Also, MLAT receives the mode A,C,S, and 1090ES(ADS-B) signals from the mounted aircraft transponder. MLAT receives signals from several receiver units and calculates aircraft positions. MLAT has ADS-B level positioning accurarcy using GPS and can calculate the position information with objects independently. According to global environment changes, Local area multiltilateration(LAM) surveillance system is under development for moving vehicles and aircraft detection in airport. These are still under testing in Tae-an Airfield. In the paper, we analyzed the performance by comparing the calculated position data from MLAT to RTK. In order to confirm the position accuracy of MLAT and the deviation of position data between fixed target and moving target on the ground during the field test in Tae-an Airfield.

Sex Identification of Jackass Penguins(Spheniscus demersus) using the CHD Gene

Tae-Sue Kim,Mi Jang,Hyun-Sung Kang,Chul-Won Song,Kang-Seok Seo 경상대학교 농업생명과학연구원 2014 농업생명과학연구 Vol.48 No.6

In many avian species, it is difficult to distinguish the sexes based on their external features. Sex determination is an important area of study in developmental and evolutionary biology, as well as in ecology. In penguins, physical sexual characteristics between males and females are hard to differentiate particularly the Jackass penguins (Spheniscus demersus) which show little sexual dimorphism. Although it is always thought that males are usually larger than females, sexing by direct observation may be difficult especially in young birds. In this research, we evaluated a sex determination technique in Jackass Penguins using genomic deoxyribonucleic acid (DNA) amplification using primers. Genomic DNA was extracted from feathers of Jackass penguins, Chickens (Gallus gallus domesticus) and Ducks (Anas Platyrhynchos var. domestica) using E prep (Viagenkorea.CO, Korea) reagent. A primer set is designed for sex determination. The primers amplifythe homologous region of the CHD-W gene (chromo-helicase-DNA-binding gene) unique to females, and the CHD-Z gene, occurring in both sexes and characterized by two bands in females and only one band in males. The results showed that analyses of the polymerase chain reaction products in Jackass penguins using 2550F-2718R and P2/P8 primer sets showed one band in both males and females. Moreover, 2550F-2718R primer set identified the sex of chickens but not in ducks while primer P2/P8 showed only one band in both chickens and ducks. The 1272L-1237H primer showed one band in male and two bands in female in all species tested. It was confirmed that the use of 1272L-1237H primer concur in identifying the sex of the following species: Jackass penguins, ducks and chickens.

Excision of reprogramming transgenes improves the differentiation potential of IPS cells into hepatocyte-like cells and hepatic organoid

Tae Hun KIM,Jaemin JEONG,Sehwan Shim,Hyosun Jang,Won Il Jang,Seung Bum Lee,Dongho Choi 한국간담췌외과학회 2022 Annals of hepato-biliary-pancreatic surgery Vol.26 No.-

Development of portable digital radiography system with device for sensing X-ray source-detector angle and its application in chest imaging

Tae-Hoon Kim(김태훈),Dong-Woon Heo(허동운),Jong-Hyun Ryu(류종현),Chang-Won Jeong(정창원),Hong Young Jun(전홍영),Kyu Gyeom Kim(김규겸),Jee Min Hong(홍지민),Mi Yeon Jang(장미연),Dae Won Kim(김대원),Kwon-Ha Yoon(윤권하) 한국컴퓨터정보학회 2017 한국컴퓨터정보학회 학술발표논문집 Vol.25 No.1

This study was to develop a portable digital radiography (PDR) system with a function measuring the X-ray source-with-detector angle (SDA) and to evaluate the imaging performance for the diagnosis of chest imaging. The SDA device consisted of an Arduino, an accelerometer and gyro sensor, and a Bluetooth module. According to different angle degrees, five anatomical landmarks on chest images were assessed using a 5-point scale. Mean signal-to-noise ratio and contrast-to-noise ratio were 182.47 and 141.43. Spatial resolution (10% MTF) and entrance surface dose were 3.17 lp/mm (157μm) and 0.266mGy. The angle values of SDA device were not significant difference as compared to those of the digital angle meter. In chest imaging, SNR and CNR values were not significantly different according to different angle degrees (repeated-measures ANOVA, p>0.05). The visibility scores of the border of heart, 5th rib and scapula showed significant differences according to different angles (rmANOVA, p<0.05), whereas the scores of the clavicle and 1st rib were not significant. It is noticeable that the increase in SDA degree was consistent with the increase of visibility score. Our PDR with SDA device would be useful to be applicable to clinical radiography setting according to the standard radiography guideline at various fields.

Simple Model of Bright-room Contrast Ratio Measurement System for Plasma Display Panels with Contrast Enhancement Film

Tae Won Beom,박종락,Gi Chan Park,Youngsik Kim,Jun Zhang,Bu Seup Song,Jong Pil Chun,Ki Cheol Yoon,Won-Gun Jang 한국광학회 2011 Current Optics and Photonics Vol.15 No.1

We have developed a simple model of a bright-room contrast ratio (BRCR) measurement system for plasma display panels (PDPs) adopting a contrast enhancement film (CEF) by using an illumination design tool. Only four model parameters were used, namely, total ambient illumination power delivered by fluorescent lamps, a panel scattering rate, illuminance of PDP white patterns, and the absorption coefficient of a color adjusting film. These parameters were determined by simple optical measurements and matching simulations. The proposed model was employed to predict the BRCR values of four different CEF samples, and the simulated ones were found to be in agreement with measured ones within about 10% relative-error.

LC : A Randomized, Multi-center, Phase IV Open-label Study to Evaluate the Long-term Effect of Carvedilol versus Propranolol on Reduction in Portal Pressure in Patients with Cirrhosis: An Interim Analysis

( Tae Yeob Kim ),( Joo Hyun Sohn ),( Soon Ho Um ),( Yeon Seok Seo ),( Soon Koo Baik ),( Moon Young Kim ),( Jae Young Jang ),( Soung Won Jeong ),( Young Seok Kim ),( Sang Gyune Kim ),( Dong Joon Kim ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1

Background: Carvedilol, a potent non-cardioselective beta blocker with vasodilating properties due to alpha-1 blockade, is more effective in reducing portal pressure than propranolol in randomized controlled hemodynamic studies. Recently, longterm low dose of carvedilol may be suggested an option for primary prophylaxis in patients with high-risk esophageal varices. The aim of this study is to evaluate long-term effect of carvediolol versus propranolol on reduction in portal pressure in patients with cirrhosis. Methods: We conducted this ongoing prospective randomized multicenter study (target sample size: 130 patients) between July 2011 and February 2013 and analyzed clinical and hemodynamic measurement data of 99 cirrhotic patients with severe portal hypertension (HVPG > 12 mmHg). During that period, these patients were randomized to either carvedilol (mean dose 11.6±2.2 mg/day in 50 patients) or propranolol group (mean dose 153.5±100.2 mg/day in 49 patients). After randomization, 8 patients and 11 patients were dropped out in carvedilol and propranolol group, respectively. The responders were defined to achieve a fall in HVPG to < 12 mmHg or a 20% reduction from baseline values 6weeks after treatment. Results: There were no significant differences between carvedilol and propranolol group in age, sex, etiology, Child-Turcott- Pugh score, MELD score, severity of HVPG, presence of ascites and baseline serum parameters. In per-protocol analysis, the rate of responder of patients with receiving carvedilol was 54.8% (23/42) as compared with 45.2% (16/38) of those with receiving propranolol (P=0.258). In intent-to-treat analysis, the rate of responder between carvedilol and propranolol group were 46.0% and 32.7%, respectively (P=0.174). The mean decrease of HVPG was 15.6±18.1% and 8.1±30.1%, respectively (P=0.188). Finally, there was no significant difference in adverse events between two groups. Conclusions: In this interim analysis, low dose of carvedilol showed similar effi cacy in reducing portal pressure compared to propranolol in cirrhotic patients with severe portal hypertension.

Debonding forces of three different customized bases of a lingual bracket system

Jang-Won Sung,Tae-Yub Kwon,Hee-Moon Kyung 대한치과교정학회 2013 대한치과교정학회지 Vol.43 No.5

Objective: The purpose of this study was to investigate whether extension of the custom base is necessary for enhancement of bond strength, by comparing the debonding forces and residual adhesives of 3 different lingual bracket systems. Methods: A total of 42 extracted upper premolars were randomly divided into 3 groups of 14 each for bonding with brackets having (1) a conventional limited resin custom base; (2) an extended gold alloy custom base: Incognito™; and (3) an extended resin custom base: KommonBase™. The bonding area was measured by scanning the bracket bases with a 3-dimensional digital scanner. The debonding force was measured with an Instron universal testing machine, which applied an occlusogingival shear force. Results: The mean debonding forces were 60.83 N (standard deviation [SD] 10.12), 69.29 N (SD 9.59), and 104.35 N (SD17.84) for the limited resin custom base, extended gold alloy custom base, and extended resin custom base, respectively. The debonding force observed with the extended resin custom base was significantly different from that observed with the other bases. In addition, the adhesive remnant index was significantly higher with the extended gold alloy custom base. Conclusions: All 3 custom-base lingual brackets can withstand occlusal and orthodontic forces. We conclude that effective bonding of lingual brackets can be obtained without extension of the custom base.

Risk Factors for Postoperative Ileus Following Orthopedic Surgery: The Role of Chronic Constipation

( Tae Hee Lee ),( Joon Seong Lee ),( Su Jin Hong ),( Jae Young Jang ),( Seong Ran Jeon ),( Dong Won Byun ),( Won Young Park ),( Soon Im Kim ),( Hyung Suk Choi ),( Jae Chul Lee ),( Ji Sung Lee ) 대한소화기기능성질환·운동학회 2015 Journal of Neurogastroenterology and Motility (JNM Vol.21 No.1

Background/Aims Distinction is vague between severe constipation and postoperative ileus (POI) in terms of pathogenesis, clinical features, and treatment options. However, no data are available regarding their associations. Methods After retrospective review of data from patients who underwent orthopedic surgery during the first 6 months of 2011, a total of 612 patients were included. Severe constipation was defined as symptoms of constipation requiring treatment using at least 2 laxatives from different classes for at least 6 months. POI was defined as paralytic ileus lasting more than 3 days post-surgery and associated with 2 or more of the following: (1) nausea/vomiting, (2) inability to tolerate an oral diet over a 24-hour period, and (3) absence of flatus over a 24-hour period. The subjects were divided into non-POI and POI groups, and we com - pared patient-, surgery-, and pharmaceutical-related factors. Results Thirteen (2.1%) out of 612 experienced POI. In comparisons between the non-POI and POI groups, univariate analysis showed significant differences in the mean age (51.4 vs 71.6 years), mean body mass index (24.1 vs 21.8 kg/m2), severe constipation (5.8% vs 76.9%), co-morbidities (33.2% vs 84.6%), type of orthopedic surgery (spine/hip/limb: 19.4/11.0/65.6% vs 23.1/61.5/15.4%), and estimated blood loss (50 vs 300 mL). Multivariate logistic regression analysis, after adjustment for age, body mass index, co-morbidities, type of orthopedic surgery, and estimated blood loss, showed that severe constipation was an independent risk factor for POI (OR, 35.23; 95% CI, 7.72-160.82; P < 0.001). Conclusions Severe constipation is associated with POI after orthopedic surgery.