• The Journal of Asian Finance, Economics and Business
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• 제8권11호
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• pp.223-234
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• 2021

This study aims to examine whether operating cash flows influence banks' financial stability in Pakistan. The study employed annual panel data collected from annual reports of 20 commercial banks listed on the Pakistan Stock Exchange for the year 2011 to 2019. Free cash flow yield was taken as the dependent variable while cash flow ratio was selected as the independent variable, and net interest margin, income diversification, asset quality, financial leverage, the cost to income ratio, advance net of provisions to total assets ratio, capital ratio, financial performance, breakup value per share and bank size were taken as control variables. The study performed ordinary least square technique, random and fixed effects models, Hausman test, Lagrange multiplier test, descriptive and correlation analysis. Results showed that operating cash flows and net interest margin significantly and positively influenced banks' financial stability while the cost to income ratio and advances net of provisions to total assets ratio significantly and negatively associated with banks' financial stability. To improve financial stability, banks should become more cost-effective and enhance their liquidity levels by lowering lending activities. In the future, it would be useful to compare commercial and investment banks, also Islamic and conventional banks in the same research setting.

• 전기학회논문지
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• 제63권7호
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• pp.956-961
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• 2014

Due to the increasing needs of anti-fall device for elderly, it is required to develop the test rigs for fall simulation. The femoral bone model consists of silicone and steel is used as an effective device to simulate falls. In this work, we propose five different femoral bone models and analyse them by using a commercial FEA tool. It has been shown that two kinds of simplified models exhibit the simulated side falls with an error range of ~1% in the impact load of femoral neck compared with full model. Especially, the upper tissue model is found to provide us with the best efficient test environment, attributable to its simple structure.

• 한국군사과학기술학회지
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• 제11권5호
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• pp.12-22
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• 2008

In this study, the dynamic characteristics for the wheel-type landing gear system of helicopter have been analyzed. Nonlinear multi-body dynamic models of the landing gear system are constructed and the equations of motion, kinematics and internal forces of shock strut are considered. In addition, flexibility effect of the wheel axle with equivalent beam element is taken into account. General purpose commercial finite code, SAMCEF which includes MECANO module is applied. The results of dynamic simulation for various landing and weight conditions are presented and compared with each other. Based on the results, characteristics of impact dynamic behaviors of the landing gear system are practically investigated.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 창립기념 춘계학술대회 논문집
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• pp.377-384
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• 1998

The crushable front part of the conventional TGV is composed of 3 energy absorption zones; retractable coupler, protective headstock and honeycomb structure. This frontal part must absorb about 80% of the energy that should be done in a cra shworthy design. The conventional TGV can absorb 2MJ impact energy by the frontal end, but 5MJ is the design target for energy absorption in the next generation TGV. To accomplish this design goal, a new concept of design is necessary for energy absorbing components. In this paper, the design concept of the tube expansion energy absorber will be proposed and analyzed. The crash analysis of the energy absorber are performed by comparing the value of the theoretical equation wi th the simulation calculated from the commercial nonlinear FE-Code ‘PAM-CRASH’ S/W.

• 환경영향평가
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• 제12권2호
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• pp.73-86
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• 2003

In this study, we performed 8 times of water quality sampling and continuous measurement of flow to identify wastewater flow characteristics for wastewater treatment basins of Namyangju city. The field survey has been conducted 6 times in dry weather period and 2 times in wet weather period. Each survey conducted 24-hr water quality sampling in the interval of 2-hr. From the analysis of flow data and water quality data, the following conclusions can be drawn. For Namyangju-1 station, which represents residential and commercial mixed area, flow rises early in the morning before office-going hour and moves up and down within narrow range, and lasted after office-leaving hour, resulting from continuous commercial activity. In case of Namyangju-5 station representing community and Namyangju- 6 station representing residential area, the flow immediately falls down after rising early in the morning and later rises again at the office-leaving hour, and arrives at peak flows around late evening. In the analysis of wastewater characteristics for weekdays and weekends, without landuse types the flow rate of weekends is higher than that of weekdays because it reflects population, being not contributed to generate wastewater during the working hours of weekdays, stay home and produce wastewater for weekends period.

• 한국도로학회논문집
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• 제19권6호
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• pp.13-21
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• 2017

PURPOSES : In this research, an SB3-level roadside barrier for a highway transition zone that meets the newly established guide Installation and Management Guide for Roadside Safety Appurtenance is developed. Its performance is evaluated by a numerical simulation and real-scale vehicle impact test. METHODS : The commercial explicit dynamic software LS-DYNA is utilized for impact simulation. An FE model of a passenger vehicle developed and released by the National Crash Analysis Center (NCAC) at George Washington University and a heavy goods vehicle (HGV) model developed by the TC226/CM-E Work Group are utilized for impact simulation. The original vehicle models were modified to reflect the conditions of test vehicles. The impact positions of the passenger vehicle and truck to the transition guardrail were set as 1/2 and 3/4 of the transition region, respectively, according to the guide. RESULTS : Based on the numerical simulation results of the existing transition barrier, a new structural system with improved performance was suggested. According to the result of a numerical simulation of the suggested structural system, two sets of transition barriers were manufactured and installed for real-scale vehicle impact tests. The tests were performed at a test field for roadside safety hardware of the Korea Highway Corporation Research Institute. CONCLUSIONS : The results of both the real-vehicle impact tests and numerical simulations of the developed transition barrier satisfied the performance criteria, and the results of numerical simulation showed good correlation with the test results.

• 지역연구
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• 제38권3호
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• pp.51-63
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• 2022

2019년 12월 시작된 COVID-19는 도시 활력에 부정적인 영향을 미치고 있으며, 특히 도시 상권 지역을 중심으로 도시 활력의 감소가 크게 나타나고 있다. 이와 같은 배경에서 본 연구의 목적은 서울시 상권을 대상으로 COVID-19 발생 전과 후의 사회적, 경제적 활력 변화를 분석하고 다항 로지스틱 분석을 이용하여 활력 변화에 영향을 미치는 요인을 규명하는 것이다. 본 연구의 주요한 분석 결과는 다음과 같다. 첫째, 상권 유형별로 상권 활력 변화를 살펴본 결과 사회적 활력보다 경제적 활력의 감소가 더 크게 나타났다. 둘째, COVID-19로 인한 도시 활력 변화는 주거지 비율이 높을수록 부정적 영향이 낮게 나타났다. 셋째, 전통시장의 경우 코로나 이후 유동인구는 감소하였으나, 다른 상권 유형과는 달리 신용카드 매출은 소폭 증가하였다. 넷째, 팬데믹 기간 동안 지하철 접근성은 서울시 상권 지역에서 사회적 활력 및 경제적 활력 감소를 개선하는 데에 긍정적 역할을 하지 못했으며, 오히려 자가용 접근성이 사회, 경제적 활력 증가에 기여하는 것으로 나타났다. 이와 같은 결과는 포스트 팬데믹 시대에 생활권 내의 보행 및 비동력 수단이 접근 가능한 다양한 상권의 조성과 활성화가 중요함을 시사하고 있다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.28-35
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• 2013

The construction industry has introduced the Leadership in Energy and Environmental Design (LEED) rating system to promote objective evaluations of the sustainability of buildings. Three important values to consider when implementing sustainability are the associated environmental, social, and economic impacts. Recently, researchers have begun to investigate the real estate value of LEED certified buildings in terms of the rental cost, occupancy rate, cost per unit area, and resale value in order to better understand the economic benefits of the LEED rating system. However, the economic benefits also encompass economic effects such as the impact of LEED certified buildings on neighborhood real estate values surrounding the certified buildings. This research examines whether the enhanced real estate value of LEED certified buildings in New York City extends to surrounding commercial buildings, utilizing spatial analysis via a Geographic Information System (GIS) and the hedonic pricing method to derive meaningful economic relationships. The results provide practical insights into the economic effect of LEED certified buildings that will be of interest to city officials and planners, as well as the owners, developers, investors and other stakeholders of surrounding buildings.

• 문화기술의 융합
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• 제9권1호
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• pp.89-94
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• 2023

최근 중국 회사채시장의 신용위험이 크게 증가하고 있으며, 회사채의 대부분을 중국 금융기관이 보유하고 있기 때문에 회사채 주요 투자자인 은행의 부실화 가능성을 배제할 수 없다. 따라서 본 연구는 중국 상업은행의 유가증권 투자비중이 경영성과에 미치는 영향을 실증분석 하였다. 분석결과를 요약하면 다음과 같다. 첫째, 중국 상업은행의 유가증권 투자비중이 증가할수록 은행의 수익성은 낮아지는 것으로 추정되었다. 현재 중국 금융당국이 금융리스크를 축소하고 경영건전성을 제고하기 위해 노력하고 있으나 회사채시장의 신용위험 증가 및 한계기업 증가로 유가증권투자는 수익성에 긍정적인 영향을 주지 못한 것으로 나타났다. 둘째, 중국 상업은행의 유가증권 투자비중이 증가할수록 은행의 건전성이 낮아지는 것으로 추정되었다. 유가증권투자가 고정이하여신비율에 직접적인 영향을 주지는 않지만 공격적인 경영으로 인해 대출자산의 부실여신이 증가한 것으로 예측된다. 중국 자본시장의 신용위험이 증가하고 있는 만큼 향후 지속적으로 부실자산에 대한 관리가 요구된다. 중국 상업은행들은 예대마진 중심의 수익확대로는 한계가 있으며, 수익성 제고를 위해 대출자산 외에 유가증권투자를 통한 포트폴리오 관리가 필요하다. 단, 회사채의 주요 투자자인 은행의 부실화 가능성이 존재함에 따라 변동성 관리를 위하여 유가증권 운용규모를 적정수준으로 조정하여 변동성을 줄이고 경영성과를 제고하기 위한 실무적 전략이 요구됨을 시사한다.

• Journal of Magnetics
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• 제17권1호
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• pp.61-67
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• 2012

The miniaturization of an electrostatic precipitator has become a key element in successfully constructing an efficient electrostatic precipitator because of the limited space allowed for installation in a subway tunnel. Therefore, the miniaturization of the rapping system of the electrostatic precipitator has also become important. This research proposes a resonant-type electromagnetic vibration exciter as a vibrating rapper for an electrostatic precipitator. The compact vibrating rapper removes collected dust from the collecting plates without direct impact on those collecting plates. To characterize the dynamic performance of the electromagnetic vibration exciter, finite element analysis was performed using a commercial electromagnetic analysis program, MAXEWLL. Moreover, we analyzed the resonant frequency of an electrostatic precipitator, to which the electromagnetic vibration exciter was applied, by ANSYS. Also, to measure the acceleration generated by the electromagnetic vibration exciter, we manufactured a prototype of the ESP and electromagnetic vibration exciter and measured its acceleration at the resonant frequency.