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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.
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.
Effects of Propolis on Sperm Function in Frozen-thawed Boar Semen
Won-Hee Lee,Dong-Jae Jang,Yong Hwangbo,Byeong-Buhm Kang,Hee-Tae Cheong,Boo-Keun Yang,Choon-Keun Park 한국동물생명공학회(구 한국동물번식학회) 2017 Reproductive & Developmental Biology(Supplement) Vol.41 No.2
The aim of this study was to evaluate effect of Propolis on viability, acrosome reaction and mitochondrial intact in frozen-thawed boar sperm. The boar semen was collected by gloved-hand method and cryo-preserved in 11% lactose with 20% egg yolk (LEY) and Triladyl containing propolis (0, 10, 30, and 50 ng/mL) with 0.05% ethanol. Cryo-preserved boar sperms was thawed at 37.5℃ for 45 sec in water-bath. Sperm viability, acrosome reaction, and mitochondrial intact were analyzed using flow cytometry. In results, viability of frozen-thawed sperm, which was cryo-preserved using LEY and triladyl, was decreased in 0, 30, and 50 propolis treatment groups. However, there was no significant difference. Acrosome reaction and mitochondrial intact of sperm was not influenced by all of propolis treatment using both of freezing extender. Motility of frozen-thawed sperm with LEY containing 10 ng/mL propolis was significantly higher than in 0, 10, and 50 ng/mL propolis treatment groups (p<0.05), whereas there was no significant difference compared to control. Especially, 0 and 30 ng/mL propolis treatment groups were significantly decreased compared to control (p<0.05). Similar to result in frozen-thawed sperm with LEY, motility of frozen-thawed sperm with triladyl was significantly increased in 10 ng/mL propolis treatment groups compare to control and other propolis treatment groups (p<0.05). In conclusion, 10 ng/mL propolis improves mobility in frozen-thawed boar sperm with LEY and triladyl, whereas 30 and 50 ng/mL propolis reduced motility. But, the addition of propolis during cryopreservation did not influence to the membrane function of frozen-thawed spermatozoa. Therefore, it is necessary to continue the study on the effects of propolis on boar spermatozoa during cryopreservation.
Camera and Radar-based Perception System for Truck Platooning
Tae-Wook Kim,Won-Seok Jang,Jaesung Jang,Jong-Chan Kim 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Truck platooning is a driving method with multiple trucks maintaining a very close gap between them, e.g., under 10 m at 90 km/h. The close longitudinal distance imposes a challenge for its perception system since a major portion of the front direction is occluded by the trailer in front. With this challenge, we present a radar and camera-based perception system for truck platooning. First, to improve the lane detection accuracy even with the serious occlusion problem, the distance to the front vehicle obtained by a radar is exploited to set a precise region of interest (ROI). Second, a state-of-the-art camera-based object detector is employed with our vehicle tracking mechanism. Third, the vehicle tracking information from the radar is fused to provide more reliable longitudinal information which is not available in the camera. Above methods are actually implemented in an embedded computer and evaluated in a highway driving scenario with prototype trucks.
( Tae Yun Park ),( Jae-woo Jung ),( Ju Young Jang ),( Jae Chol Choi ),( Jong Wook Shin ),( In Won Park ),( Byoung Whui Choi ),( Jae Yeol Kim ) 대한결핵 및 호흡기학회 2018 Tuberculosis and Respiratory Diseases Vol.81 No.2
Background: Eosinophilia is well recognized in specific conditions. The objective of the present study was to determine clinico-radiologic characteristics of eosinophilia and changes in prevalence over 10 years in recipients of private health screening program at a tertiary hospital in Korea. Methods: Data of private health screening program recipients at the health promotion center of Chung-Ang University Hospital from 2004 to 2013 were collected. Health-related questionnaires and laboratory findings of private health screening program with possible relation with eosinophilia were reviewed. Results of enzyme-linked immunosorbent assay (ELISA) for parasite, chest computed tomography, and pulmonary function test were also reviewed. Results: The cumulative prevalence of eosinophilia was 4.0% (1,963 of 48,928). Prevalence of eosinophilia showed a decreased trend from 2004 to 2013. Most cases (96.6%) had mild degree of eosinophilia. Eosinophilic subjects were older and male-predominant. They showed lower levels of forced expiratory volume in 1 second (FEV<sub>1</sub>%), forced vital capacity (FVC%), and FEV<sub>1</sub>/FVC than those without eosinophilia. Eosinophilic subjects showed higher positive rate for common parasite in ELISA than those without eosinophilia. On radiologic findings, consolidation and ground glass opacities were positively associated with the degree of eosinophilia. When eosinophil was classified based on severity, statistically significant correlation between the severity of eosinophil and radiologic abnormalities was found. Conclusion: Eosinophilia is uncommon in healthy population. It usually occurs at a mild degree. Eosinophilic patients have more radiologic abnormalities compared to those without eosinophilia. Such radiologic abnormalities are associated with the severity of eosinophilia.
Intuitionistic Fuzzy Subgroups and Level Subgroups
Tae Chon Ahn,Kul Hur,Kyung-Won Jang 한국지능시스템학회 2006 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.6 No.3
We introduce the concept of level subgroups of an intuitionistic fuzzy subgroup and study some of it's properties. These level subgroups in turn play an important role in the characterization of all intuitionistic fuzzy subgroup of a prime cyclic group.