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Journal of Traffic and Transportation Engineering 2017年第5期5卷 260-270页

作者： Se-Yeon Jung Baek-Jae Kim kwang-eui yoo The Korea Transport Institute 370 Sicheong-daero Sejong-si South Korea Qatar Airways 2060 Unseo-Dong Jung-Gu Incheon South Korea Korea Aerospace University 76 Hanggongdaehang-ro Goyang-si South Korea

This study analyzes air passenger route choice behavior for long-haul inter-continental travel. It employs the SP （state preference） technique and logit modeling to investigate the impact of route development via neighboring countries in the region. With the Japanese government pursuing an increase in international routes at Haneda International Airport, and the Chinese government planning to construct Beijing Capital Second International Airport by 2019, the competition among airports to serve as hubs in Northeast Asia will increase significantly. Korean passengers will have a greater number of route choices when traveling to North America or Europe, utilizing not only direct flights from Incheon International Airport but also flights via Tokyo or Beijing area airports including Haneda International Airport, Narita International Airport, Beijing Capital International Airport and Beijing Capital Second International Airport. Accordingly, passengers will choose among the alternatives by considering fares and flight times. As such, it is essential for airports to offer flights with competitive prices for transit passengers to become successful competitive airports in the region. Therefore, it will become more important for market decision makers to strive toward more attractive ticket prices and better route network quality.

关键词： Passenger route choice behavior SP technique multinomial logit model nested logit model competitive airports inNortheast Asia.

Passenger Perceptions and Choice Behavior of National,Low Cost and Foreign Carriers:A Case Study on Incheon International Airport

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Journal of Traffic and Transportation Engineering 2018年第5期6卷 230-240页

作者： Baek-Jae Kim Se-Yeon Jung kwang-eui yoo Qatar Airways 2060Unseo-Dong Jung-GuIncheonSouth Korea The Korea Transport Institute 370 Sicheong-daeroSejong-si339-007South Korea Korea Aerospace University 76 Hanggongdaehang-roGoyang-siSouth Korea

Recently,the LCCs(low cost carriers)using ICN(Incheon International Airport)as a hub have increased their international *** addition,foreign nationality airlines,including Middle Eastern carriers,have gradually increased their operations at *** growth in carrier services has resulted in a more competitive market environment,and reasonable resource assignment has become an important issue for airport ***,the airport will open a new terminal—T2(terminal 2)in early 2018,and carriers will need to adjust their operations reflecting the utilization of newly assigned *** by this change,we investigate the differentiation of airport service perception as well as airline choice behavior by passenger groups at *** paper employs a MNL(multinomial logit)model as well as a SEM(structural equation model).The results indicate that airline gate allocation is a significantly important value for passengers in terms of airport service perception and choice *** perception and choice behavior differ according to the selected *** study concludes that it is significantly important to consider the characteristics of passenger perception and choice behavior to improve airport operational efficiency,particularly with respect to carrier facility assignment.

关键词： Terminal facility assignment passenger perception choice behavior

An Evaluation of Network Competitiveness and the Effects of LCCs on South Korea’s Network Connectivity:Using Aviation Market Data

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Journal of Traffic and Transportation Engineering 2018年第3期6卷 109-120页

作者： Se-Yeon Jung Baek-Jae Kim kwang-eui yoo The Korea Transport Institute 370 Sicheong-daeroSejong-si 339-007South Korea Qatar Airways 2060Unseo-dong Jung-guIncheonSouth Korea Korea Aerospace University 76 Hanggongdaehang-roGoyang-siSouth Korea

LCCs(low cost carriers)are expanding their routes,which is affecting airport network *** subsequent increases in market competition and the number of airlines operating in air network routes have made the centrality analysis more significant because it can be used to identify airport network connectivity *** study analyzes the network connectivity competitiveness of South Korea among Asian airports using the MIDT(marketing information data transfer)dataset provided by OAG Traffic Analyser,which provides data collected from regional Asian airports since *** network centrality of individual airports is estimated to compare network connectivity competitiveness in *** for overall network centrality include degree,closeness and betweenness *** network centrality analysis may be helpful for South Korean airports in identifying their network performance and competitive position in Asia and confirming the effects that LCCs have on airport network *** results indicate that South Korea’s aviation market needs to expand its network via a strategy that prioritizes the strengthening of airport connectivity and the pursuit of *** addition,LCC operations will support Korea’s network growth via the various strategies that they ***,this in turn will bolster the overall market competitiveness of South Korean airports.

关键词： Air network connectivity competitiveness network connectivity centrality analysis low-cost carrier effects

Air Traffic Volume and Air Traffic Control Human Errors

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Journal of Transportation Technologies 2011年第3期1卷 47-53页

作者： Woo-Choon Moon kwang-eui yoo Youn-Chul Choi 不详

Navigable airspaces are becoming more crowded with increasing air traffic, and the number of accidents caused by human errors is increasing. The main objective of this paper is to evaluate the relationship between air traffic volume and human error in air traffic control (ATC). First, the paper identifies categories and elements of ATC human error through a review of existing literature, and a study through interviews and surveys of ATC safety experts. And then the paper presents the results of an experiment conducted on 52 air traffic controllers sampled from the Korean ATC organization to find out if there is any relationship between traffic volume and air traffic controller human errors. An analysis of the experiment clearly showed that several types of ATC human error are influenced by traffic volume. We hope that the paper will make its contribution to aviation safety by providing a realistic basis for securing proper manpower and facility in accordance with the level of air traffic volume.

关键词： ATC Human Error Air traffic volume Workload

Enhanced solid-electrolyte interface efficiency for practically viable hydrogen-air fuel cell systems

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Journal of Energy Chemistry 2025年第1期100卷 356-368页

作者： Venkitesan Sakthivel Dong Jin yoo Graduate School Department of Energy Storage/Conversion Engineering (BK21 FOUR) Hydrogen and Fuel Cell Research Center Jeonbuk National University Jeonju Department of Life Science Jeonbuk National University

Proton exchange membrane fuel cells （PEMFCs） provide an appealing sustainable energy system,with the solid-electrolyte membrane playing a crucial role in its overall ***,sulfonated poly（1,4-phenylene ether-ether sulfone）(SPEES),an aromatic hydrocarbon polymer,has garnered considerable attention as an alternative to Nafion ***,the long-term durability and stability of SPEES present a significant *** this context,we introduce a potential solution in the form of an additive,specifically a core–shell-based amine-functionalized iron titanate （A–Fe2TiO5）,which holds promise for improving the lifetime,proton conductivity,and power density of SPEES in *** modified SPEES/A–Fe2TiO5composite membranes exhibited notable characteristics,including high water uptake,enhanced thermomechanical stability,and oxidative ***,the SPEES membrane loaded with 1.2 wt%of A–Fe2TiO5demonstrates a maximum proton conductivity of 155 mS cm-1,a twofold increase compared to the SPEES membrane,at 80°C under 100%relative humidity （RH）.Furthermore,the 1.2 wt%of A–Fe2TiO5/SPEES composite membranes exhibited a maximum power density of 397.37 mW cm-2and a current density of 1148 mA cm-2at 60°C under 100%RH,with an opencircuit voltage decay of 0.05 m V/h during 103 h of continuous *** study offers significant insights into the development and understanding of innovative SPEES nanocomposite membranes for PEMFC applications.

关键词： Composite membranes

Mimicking a Superhydrophobic Insect Wing by Argon and Oxygen Ion Beam Treatment on Polytetrafluoroethylene Film

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Journal of Bionic Engineering 2009年第4期6卷 365-370页

作者： Youngjong Lee Yonghoon yoo Jihoon Kim Sriyulianti Widhiarini Baeho Park Hoon Cheol Park kwang Joon yoon Doyoung Byun Department of Aerospace Information Engineering Konkuk UniversitySeoul 143-701Republic of Korea Department of Physics Konkuk UniversitySeoul 143-701Republic of Korea Department of Advanced Technology Fusion Konkuk UniversitySeoul 143-701Republic of Korea

Biological tiny structures have been observed on many kinds of surfaces such as lotus leaves and insect wings,which enhance the hydrophobicity of the natural surfaces and play a role of *** presented the fabrication technology of a superhydrophobic surface using high energy ion *** insect wings that mimic the morphology and the superhydrophobocity of cicada's wings were successfully fabricated using argon and oxygen ion beam treatment on a polytetrafluoroethylene (PTFE)*** wing structures were supported by carbon/epoxy fibers as artificial flexible veins that were bonded through an autoclave *** morphology of the fabricated surface bears a strong resemblance to the wing surface of a cicada,with contact angles greater than 160°,which could be sustained for more than two months.

关键词： superhydrophobic insect wing mimicry of the wing ion beam treatment artificial flapper dynamic contact angle

Carcinoma of the middle bile duct:Is bile duct segmental resection appropriate?

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World Journal of Gastroenterology 2009年第47期15卷 5966-5971页

作者： Hyung Geun Lee Sang Hoon Lee Dong Do yoo kwang Yeol Paik Jin Seok Heo Seong Ho Choi Dong Wook Choi Department of Surgery Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 135-710South Korea

AIM:To compare survival between bile duct segmental resection(BDSR)and pancreaticoduodenectomy(PD) for treating distal bile duct cancers. METHODS:Retrospective analysis was conducted for 45 patients in a BDSR group and for 149 patients in a PD group. RESULTS:The T-stage(P<0.001),lymph node invasion (P=0.010)and tumor differentiation(P=0.005)were significant prognostic factors in the BDSR *** 3-and 5-year overall survival rates for the BDSR group and PD group were 51.7%and 36.6%,respectively and 46.0%and 38.1%,respectively(P=0.099).The BDSR group and PD group did not show any significant difference in survival when this was adjusted for the TNM *** 3-and 5-year survival rates were: stageⅠa[BDSR(100.0%and 100.0%)vs PD(76.9% and 68.4%)(P=0.226)];stageⅠb[BDSR(55.8% and 32.6%)vs PD(59.3%and 59.3%)(P=0.942)]; stageⅡb[BDSR(19.2%and 19.2%)vs PD(31.9%and 14.2%)(P=0.669)]. CONCLUSION:BDSR can be justified as an alternative radical operation for patients with middle bile duct inselected patients with no adjacent organ invasion and resection margin is negative.

关键词： Bile duct cancer Segmental resection Pancreaticoduodenectomy

Ground settlement during tunneling in groundwater drawdown environment-Influencing factors

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Underground Space 2016年第1期1卷 20-29页

作者： Chungsik yoo School of Civil Architectural Engineering and Landscape ArchitectureSungkyunkwan University2066 Seoboo RoJan-An GuSuwonKyong-Gi Do 16419Republic of Korea

In this paper,the results of a parametric study on groundwater drawdown-induced surface settlement during tunneling in waterbearing ground are presented.A calibrated stress–pore pressure coupled finite element model was adopted for the parametric *** results were analyzed to establish the relationships between key design issues,such as the ground surface settlement and groundwater drawdown,and influencing *** artificial neural network(ANN)-based sensitivity analysis was performed to obtain insight into the relative importance of the influencing *** results indicated that the primary influencing factors on the settlement development are the thickness and stiffness of the soil layer within the drawdown zone and the lining permeability,while the initial void ratio and the permeability of the soil layer were considered secondary influencing *** implications and findings of the study are discussed.

关键词： Conventional tunneling Ground settlement Groundwater Finite element method Stress-pore pressure coupled analysis

Tenofovir rescue therapy for chronic hepatitis B patients after multiple treatment failures

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World Journal of Gastroenterology 2012年第47期18卷 6996-7002页

作者： Yu Jin Kim Dong Hyun Sinn Geum-Youn Gwak Moon Seok Choi kwang Cheol Koh Seung Woon Paik Byung Chul yoo Joon Hyeok Lee Department of Medicine Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 135-710South Korea

AIM:To evaluate the efficacy and safety of tenofovir disoproxil fumarate(TDF) for chronic hepatitis B(CHB) patients after multiple ***:A total of 29 CHB patients who had a suboptimal response or developed resistance to two or more previous nucleoside/nucleotide analogue(NA) treatments were *** subjects were treated with TDF alone(n = 13) or in combination with lamivudine(LAM,n = 12) or entecavir(ETV,n = 4) for ≥ 6 *** virologic response(CVR) was defined as an achievement of serum hepatitis B virus(HBV) DNA level ≤ 60 IU/mL by real-time polymerase chain reaction method during *** assessment was based on serum creatinine and phosphorus *** patients had histories of LAM and adefovir dipivoxil(ADV) treatment and 18 patients were exposed to LAM,ADV,and ***-seven patients(93.1%) were hepatitis B e antigen(HBeAg) positive and the mean value of the baseline serum HBV DNA level was 5.5 log IU/mL ± 1.7 log IU/*** median treatment duration was 16 mo(range 7 to 29 mo).RESULTS:All the patients had been treated with LAM and developed genotypic and phenotypic resistance to *** to ADV was present in 7 patients and 10 subjects had a resistance to *** patient had a resistance to both ADV and *** cumulative probabilities of CVR at 12 and 24 mo of TDF containing treatment regimen calculated by the Kaplan Meier method were 86.2% and 96.6%,*** one patient failed to achieve CVR,serum HBV DNA level decreased by 3.9 log IU/mL from the baseline and the last serum HBV DNA level during treatment was 85 IU/mL,achieving near *** patients in this study showed viral breakthrough or primary non-response during the follow-up *** cumulative probability of HBeAg clearance in the 27 HBeAg positive patients was 7.4%,12%,and 27% at 6,12,and 18 mo of treatment,*** efficacy of TDF containing regimen was not statistically different according to the presence of specific HBV mutatio

关键词： Tenofovir Chronic hepatitis B Treatment failure

Clinical course of sub-centimeter-sized nodules detected during surveillance for hepatocellular carcinoma

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World Journal of Gastroenterology 2012年第21期18卷 2654-2660页

作者： Yang Won Min Geum-Youn Gwak Min Woo Lee Moon Seok Choi Joon Hyoek Lee kwang Cheol Koh Seung Woon Paik Byung Chul yoo Department of Medicine Samsung Medical Center Sungkyunkwan University School of MedicineSeoul 135-710 South Korea Department of Radiology Samsung Medical Center Sungkyunkwan University School of MedicineSeoul 135-710 South Korea

AIM: To evaluate the outcome of sub-centimeter-sized nodules (SCSNs) detected during surveillance for hepatocellular carcinoma (HCC) in patients at risk. METHODS: We retrospectively analyzed a total of 142 patients with liver cirrhosis or chronic hepatitis B or C without a prior history of HCC in whom a SCSN was detected during HCC surveillance. We calculated the rate of HCC development from SCSNs in the study population and analyzed the differences in the baseline clinical characteristics and imaging features between the patients with SCSNs that eventually developed into HCC and patients with SCSNs that did not develop into ***: During 667 person-years of follow-up, HCC developed in 33 patients. The calculated HCC development rate was 4.9% per year. The cumulative one-, two-, three- and five-year HCC development rates were 5.6%, 10.6%, 14.1% and 20.4%, respectively. Upon baseline comparison, the HCC group was older (54.4 ± 8.3 years vs 48.9 ± 9.4 years; P = 0.003) and had lower albumin levels (3.56 ± 0.58 g/dL vs 3.84 ± 0.55 g/dL; P = 0.012) and higher baseline alpha-fetoprotein (AFP) levels (8.5 ng/mL vs 5.4 ng/mL; P = 0.035) compared to the non-HCC group. Nodule pattern and initial radiologic diagnosis also differed between the two groups. Multivariate analysis revealed that age [P = 0.012, odds ratio (OR) =1.075, 95% confidence interval (CI) =1.016-1.137], sex (P = 0.009, OR = 3.969, 95% CI: 1.403-11.226), and baseline AFP level (P = 0.024, OR = 1.039, 95% CI: 1.005-1.073) were independent risk factors for developing HCC. CONCLUSION: The overall risk of HCC development in patients with SCSNs is similar to that in liver cirrhosis patients. Patients with these risk factors need to be closely monitored during follow-up.

关键词： Chronic liver disease Hepatocellular carcinoma Risk factor Sub-centimeter-sized nodule