Busan Metropolitan City

Busan, South Korea

Busan Metropolitan City

Busan, South Korea
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Song B.-D.,Busan Metropolitan City | Park B.-G.,Backyoung G&C Co. | Choi Y.,Kyungsung University | Kim T.-H.,Korea Maritime and Ocean University
Construction and Building Materials | Year: 2017

A series of High Performance & Multi-Functional Agent (Hi-FA) grout materials have been developed. This material is a surfactant compound that can provide high flowability and viscosity if it is added to Portland cement. The purpose of this study is to determine the properties of the developed Hi-FA grouts and to confirm whether they are suitable materials for underwater construction. To determine this, an experiment covering the methodologies used in concrete was reviewed and then adopted with some modifications. Using the proposed test methods, laboratory tests were conducted and the properties of the Hi-FA grouts were determined. The anti-washout, bleeding, self-leveling and uniaxial compression tests were conducted. These tests showed that the Hi-FA grouts displayed adequate engineering properties for underwater construction when the Hi-FA material was mixed with cement. © 2017 Elsevier Ltd

Lee D.,Nagoya University | Lim S.,Busan Metropolitan City | Choi K.,Pusan National University
Maritime Policy and Management | Year: 2017

By incorporating port competition into a third-market model consisting of two exporting firms and one importing country, we demonstrate the endogenous choice of port structures (i.e. privatization or public ownership) under either Bertrand or Cournot competition. In contrast to previous studies on port competition, we analyze the port strategy in view of all trading countries (i.e. importing country and exporting countries). We find that regardless of transport cost, the port ownership strategy alters according to exporting firm’s competition mode. Under Bertrand competition, the choice of port ownership structure depends on the degree of imperfect substitutability. However, under Cournot competition, all trading countries choose same ownership structures of each port. By comparing equilibrium of each competition mode, we show that welfare of exporting country under Cournot competition is higher than under Bertrand competition if goods are sufficiently substitutes. In contrast, importing country prefers Bertrand competition to Cournot competition when the competitive pressure is sufficiently high. © 2017 Informa UK Limited, trading as Taylor & Francis Group

Bae S.J.,Pusan National University | Lee J.S.,Pusan National University | Kim J.M.,Pusan National University | Lee E.K.,Pusan National University | And 9 more authors.
Journal of Agricultural and Food Chemistry | Year: 2010

5-Hydroxytryptophan (5HTP), an analogue of tryptophan, is a precursor of serotonin that also has effective antioxidative and anti-apoptotic properties (1). However, the cellular mechanisms underlying these properties of 5HTP have not been explored. In this study, we tested the hypothesis that 5HTP exerts its antioxidative action against oxidative stress and inflammation by suppressing the activation of the key pro-inflammatory transcriptional pathways, p38 mitogen-activated protein kinase (p38MAPK) and nuclear factor-κB (NF-κB). The study was carried out using human fibroblast cells that were challenged by tert-butylhydroperoxide (t-BHP)-induced oxidative damage. Results show that 5HTP significantly reduced t-BHP-induced oxidative damage in human fibroblast cells, as determined by cell cytotoxicity, intracellular reactive species (RS) and peroxynitrite (ONOO-) generation, and inducible nitric oxide synthase expression. Moreover, 5HTP protected human fibroblast cells against t-BHP-induced oxidative DNA damage, as determined by 4,6-diamidino-2-phenlylindole (DAPI) staining. Pretreatment of human fibroblast cells with 5HTP also dose-dependently inhibited glutathione (GSH) depletion, indicating that it protects cells against t-BHP-induced oxidative damage. Western blot analysis revealed that 5HTP also markedly increased Bcl-2 expression and suppressed both p38MAPK and NF-κB activation in the t-BHP-treated human fibroblast cells. When these results are taken together, they strongly indicate that 5HTP has beneficial and protective effects against t-BHP-induced cell death in vitro, as demonstrated by its antioxidative and anti-inflammatory actions. Data further showed that the protective mechanisms underlying the actions of 5HTP against oxidative stress-induced damage are associated with RS/ONOO- scavenging and the inhibition of lipid peroxidation and GSH depletion. © 2010 American Chemical Society.

Yang J.,Korea Institute of Construction Technology | Yang J.,Pusan National University | Baeg H.,Pusan National University | Moon S.,Busan Metropolitan City
KSCE Journal of Civil Engineering | Year: 2014

The design review in a Value Engineering (VE) workshop generates ideas for alternative construction designs that, if adopted, would improve the function of the original design. Each alternative conceived during idea generation will usually carry some beneficial and some adverse effects that must be traded off against each other when deciding whether or not to adopt the design. The objective of this paper is to investigate the characteristics of contradiction in idea creation, and use them to create better design alternatives in construction VE. An Idea Breakdown Structure (IBS) is applied as the principle of problem solving. A contradiction table is then set up to overcome contradictions in construction design. A case study shows that balanced contradiction produces better alternatives in construction VE. © 2014 Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg.

Lee S.Y.,Busan Metropolitan City | Jung H.Y.,Pusan National University
17th ITS World Congress | Year: 2010

The Semi-public Bus Transportation System and the Bus-Subway Transfer System included Community buses, recently implemented in Busan, provide a better service quality of public transportation for a citizen of Busan. However, these systems have brought out problems like decreases of service frequency, a spread of drivers' egotism and managers' carelessness, and so on. It has been happened diseconomy that service hasn't improved to be caused inconvenience of bus user as increasing headway. It has been occurred imbalance of demand and supply, because of a wide difference of headway's and bus user demand's fluctuation. Therefore, this study explores a way to control more flexible bus headway to provide reduction of operation costs to private bus companies and a better service quality of urban transportation system to citizens. For doing this study, we make use of BIMS(Bus Information Management System) data.

Moon S.,Pusan National University | Ha C.,Busan Metropolitan City | Yang J.,Busan Metropolitan City
Journal of Construction Engineering and Management | Year: 2012

Abstract Value engineering (VE) is an effort to increase the value of a system through a creative and organized approach. Idea generation is the most important part in a VE job plan. Although the experts in a VE team can evaluate multiple alternatives that can replace the original idea, idea generation is usually on the basis of their knowledge and experience. A structured method will help to consider different functional perspectives and to create inventive ideas that could have been missed otherwise. This paper presents a construction value engineering inventive idea support (CVE-IIS) tool for structured idea generation in construction VE. In this study, previous VE reports were analyzed to understand the pattern of proposed ideas in highway construction design. These ideas were categorized according to the rules of advanced systematic inventive thinking (ASIT) to establish an idea breakdown structure (IBS). The IBS was then used to support the generation of construction ideas using idea-generation worksheets. A case study demonstrated that the CVE-IIS can help improve the value of design functions by improving performance. © 2012 American Society of Civil Engineers.

Nam M.S.,Research Institute of Korea Expressway Corporation | Kim H.-J.,Research Institute of Korea Expressway Corporation | Kwon S.-G.,Busan Metropolitan City
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

Earthquakes have occurred globally over the last two decades, which have resulted in an increased expectation of acceptable performance for bridge structures during seismic events. Many research projects have been performed to assess the degree of structural damage especially upper structure of bridges. However, a few researches are available on the pile foundation systems and their response to earthquakes especially for a pile to pile-cap connection. When a pile-cap is loaded, moment and axial loads are transferred to the pile through the pile to pile-cap connection. There is uncertainly with regards the portion of the loads the connection experiences due to the inability to effectively monitor the forces the connection experiences during loadings. In order to investigate behavior of the pile to pile-cap connection for steel pipe piles subject to axial and uplift loads, full scale tests were conducted, and their key factors were considered from test results.

Jeon B.,Kyungsung University | Choi Y.,Kyungsung University | Kim C.,Kyungsung University | Song B.,Busan Metropolitan City
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

Sonar Roughness Profiling System (SRPS) that can be used in the construction site was developed and verification tests were conducted to evaluate the applicability of SRPS. Firstly, in the indoor test, objective was to study the ability of sonar sensors. It was tested to check the effect of different shapes and turbidity using five specimens. It was found that the sensors had an accuracy of 1 mm. Plus, it was not greatly affected by the change of the shapes and turbidity. Secondly, in order to confirm field application of SRPS, tests were carried out on site. Although some problems were found, test was completed properly according to test procedure. Based on the test results, it was confirmed that SRPS could be used to measure socket roughness on site where shaft were drilled in rock.

News Article | February 17, 2017
Site: www.marketwired.com

SEOUL, SOUTH KOREA--(Marketwired - Feb 17, 2017) - TV Chosun announced 40 leaders of various companies, governments, and non-profit organizations as the 'The Korea's Influential CEO in 2017'. Hosted by TV Chosun and sponsored by Chosunilbo, Ministry of Science, ICT, and Future Planning, and Ministry of Trade, Industry and Energy, the award ceremony for "The Korea's Influential CEO in 2017" was at Millennium Hilton Hotel in Seoul on January 25th with the award winners and their peers and family. The following is the list of the award winners: Won-Suk, Oh (Chairman / Korea Fuel Tech Corporation)  Sung-Hee, Kang (Chairman / CLK Corporation)  Un-Ha, Roh (CEO / Panasonic Korea, Ltd.) In-Gyu, Park (Chairman / DGB Financial Group Co., Ltd.)  Hwa-Sun, Shin (CEO / Shinwha Real Estate Research & Development Institute) Se-Jong, Lee (Vice-president / Suncore, Inc.)  Yoshimi, Takahashi (CEO / SBI Investment Korea Co., Ltd.)  Joo-Hyun, Moon (Chairman / Mdmworld.co.kr & Marketing Co., Ltd.)  Kuk-Hyun, Kim (Chairman / Inist bio Co., Ltd.)  Hong-Goo, Lee (CEO / Tobesoft, Inc.)  Yoon-Chai, Lee (Chairman / Pigeon Corporation)  Dong-Won, Kwak (CEO / Busan Metropolitan Corporation)  Gi-Woo, Lee (President / JEI University)  Soon-Ja, Lee (President / Gyeongju University) Ji-Ha, Lee (CEO / Saemaul Globalization Foundation)  Soon-Chul, Kim (Chairman / Korea Federation of Credit Guarantee Foundations)  Yeo-Pyo, Yun (President / Chungbuk National University)  Yeu-Keun, Choi (CEO / KEPCO Plant Service & Engineering)  Bo-Saeng, Park (Mayor / Gimcheon City)  Joo-Soo, Kim (Governor / Uiseong County)  Byung-Soo, Suh (Mayor / Busan Metropolitan City)  Chung-Sik, Kim (Governor / Changnyeong County)  Dong-Soo, Han (Governor / CheongSong County)  Sung-Woo, Kim (Governor / Goryeong County)  Woo-Jeong, Park (Governor / Gochang County)  Hyun-Bok, Jeong (Mayor / Gwangyang City)  Yoon-Joo, Kim (Mayor / Gunpo City) Dong-Chell, Park (Governor / Geumsan County)  Suk-Woo, Lee (Mayor / Namyangju City)  Moon-Oh, Kim (Governor / Dalseong County)  Hong-Jang, Kim (Mayor / Dangjin City)  Chun-Hee, Park(Mayor / Songpagu Office) Kyu-Sun, Kim (Governor / Yeoncheon County)  Saeng-Gi, Kim (Mayor / Jeongeup City)  Chang-Hee, Lee (Mayor / Jinju City)  Seung-Yool, Lee (Governor / Cheongdo County)  Seok-Hwa, Lee (Governor / Cheongyang County)  Sang-Ki, Han (Governor / Taean County)  Seok-Hwan, Kim (Governor / HongSeong County) Moon-Soon, Choi (Governor / Hwacheon County)

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