• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 임시총회 및 추계학술발표회
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• pp.450-452
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• 2004

Using factor analysis and bivariate comparisons of major components in ground water, three geochemical processes were identified as controlling factors of ground water chemistry; 1) natural mineralization by water rock interactions, 2) effect of seawater which includes salinization by seawater near seashores and deposition of sea salt, and 3) nitrate contamination by N fertilization. Contribution of rainfall was also estimated from the measured composition of wet deposition. The geochemical processes were separated using total alkalinity as an indicator for natural mineralization, Cl for effect of seawater, and nitrate for N fertilization. Relatively high correlation of major components with nitrate suggests that nitrification of nitrogenous fertilizers significantly affects ground water chemistry. Total cations derived from nitrate sources have good linearity for nitrate in equivalent basis with a slope of 1.8, which is a mean of proton production coefficients in nitrification of two major compounds in nitrogenous fertilizers, ammonium and urea. Contribution of nitrate sources to base cations, Cl, and SO$_4$ in ground water was determined considering maximum contribution of natural mineralization to estimate a threshold of the effect of N fertilization for ground water chemistry, which shows W fertilization has a greatest effect than any other processes in ground water with nitrate concentration greater than 50 mg/L for Ca, Mg, Na and with concentration greater than 30 mg/L for Cl and SO$_4$.

• 지역연구
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• 제13권2호
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• pp.93-118
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• 1997

Main findings of this study are as follows. Time-space model of Korea for urban growth model is established. The variables of space model resulted in job and education, which both are significant at 0.01 level and positive. The effect of job and education on the urban growth are 0.76 and 0.29 respectively in average. the determinants for deciding the influences for job variable are income variable and price-level variable. Income variable contributes 68.66% and the direction is negative while contribution of price-level variable is 29.90% and the direction is positive. The determinants for education variable are income, unemployment and wage difference between university graduates and high school graduates. The contribution and the high school graduates. The contribution and the direction of each variable for education variable are 63.6% and positive for the unemployment variable, 15.99% and negative for the income variable and 13.75% and positive for the wage difference variable. This study in different from previous works in three ways. The first is to establish the time-space model which could consider the time and space factor simultaneously. The second is to build data bases which contain the data of almost every city and every year in Korea during the objective period, which make the analysis continuous. The third is that the general analytic framework for the study is macrosocial one rather than a behavioral one, which means the unit of analysis is the metropolitan community and each city occupies population actively through it's potential power such as jobs, education and so on rather than a city population is the passive result of migration.

• 기술혁신학회지
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• 제7권3호
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• pp.657-679
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• 2004

The purpose of this paper is to measure economic impact of marine environment conservation research development project. Benefit-Cost(B/C) analysis and Contingent Valuation Methods(CVM) are used to valuate the benefits from the research development projects. A period of three years for research development fund is considered as a part of the costs and adjusted to the net present value (NPV) of the 2002 ending period. The environmental charges for marine environment improvement are considered for the benefit measurement. The benefits are estimated by using monthly average willingness to pay, which is 2,289 Korean won. The contribution of the developing a management model for environmental pollution in the Gwangyang Bay is evaluated utilizing survey data and information. Based on the assessment by expert groups, the contribution of the model was 37.5％. The research results showed that B/C ratio is 20.61, NPV is 89,200 million Korean won, and social rate of return is 185.7％. When the level of contribution is over 1.83％ at the assessment of potential influence, it is recognized to be economically feasible. This research presents a quantitative framework for Research and Development projects for marine environment conservation, and it can be applied to decision making for the investment size of R&D projects.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall
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• pp.273-280
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• 1999

The base shear and the veritcal distribution of shears along the height of a building are two fundamental measures that define the design seismic load. But the method specified in Korean building code does not give an appropriate distribution for buildings of tall or longer period because it roughly account for the contributions of the higher modes. several methods to give a better distribution of seismic forces have been proposed. But they have not been introduced into the seismic codes yet probably because they cannot solve all the above-mentioned problems. This paper deals with the distribution of lateral seismic forces along the height of a building to account for the contribution of the higher modes. After reviewing some existing distributions in seismic codes and literatures moment-resisting frames with various stories were studied by modal analysis for a wide range of fundamental period and the stiffness ratio of the buiding. As a result of the analysis a new expression for the distribution of seismic forces is proposed and compared with those of some codes and dynamic analysis.

• 한국자동차공학회논문집
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• 제20권3호
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• pp.119-125
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• 2012

Caliper intergrated Electric Parking Brake (EPB) is an automatic parking brake system, attached to rear caliper. Because EPB uses luxury vehicles recently, the drivers of vehicles are sensitive to the EPB noise. EPB is operated by the motor and gear, so noise is generated by motor and gear. In order to reduce noise, One of EPB manufacturers uses helical gear and changes the shape of EPB housing. But these methods are not optimized for reduction of interior noise. There are many noise transfer paths into vehicle interior and it is difficult to identify the noise sources. Therefore, in this study, we performed contribution analysis and modal testing in the vehicle system. It is possible to distinguish between air-borne noise and structure-borne noise in the vehicle interior noise by comparing interior noise peak with resonance mode map.

• 대한지역사회영양학회지
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• 제11권5호
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• pp.642-649
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• 2006

The purposes of this study were to investigate methods of applying activity-based cost to menu engineering and to examine the feasibility. A total of 6 menu items of XYZ restaurant in Seoul were selected and the ledger of September 2005 was used for menu analysis. The menu mix percent of beef sirloin steak (61.95%) and beef tenderloin steak (17.13%) were labeled as high, whereas BBQ pork ribs (4.94%), salmon fillet (2.66%), seafood platter (5.77%), and teriyaki chicken (7.56%) showed low menu mix percent. In addition, the contribution margin for BBQ pork ribs (29,000 won), salmon fillet (25,810 won), seafood platter (22,400 won), and teriyaki chicken (22,000 won) were higher than the average contribution margin (21,957 won), and those for beef sirloin steak (21,200 won) and beef tenderloin steak (21,900 won) were lower than average. When popularity and contribution margin were applied in menu engineering, BBQ pork ribs, salmon fillet, seafood platter and teriyaki chicken were classified as puzzles and beef tenderloin steak and beef sirloin steak as plowhorses. Menu engineering using popularity and operating profit, which was calculated from activity-based cost, also gave the same results, whereas the additional label for activity cost placed BBQ pork ribs and salmon fillet in the brain teaser category. Ranking analysis on variables estimating menu profitability using Spear-man's ${\rho}$ revealed that there were no significant correlation between variables, which means the estimation of menu item profitability could differ by methods of analysis. With these results, it was concluded that activity-based cost would help to establish more detailed marketing strategy for a restaurant.

• 농업과학연구
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• 제43권4호
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• pp.603-611
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• 2016

The aim of this study was to analyze the contribution factors (backfat thickness, eye muscle area, carcass weight, marbling score, and feeding period) affecting meat unit price (South-Korean Won / Kg of meat). The best slaughtering age to maximize unit price was also assumed. All data used in this study were acquired from the Korea Institute for Animal Products Quality Evaluation from 2010 to 2014. Contributions to the estimated unit price of cows by the following factors, backfat thickness, eye muscle area, carcass weights, feeding period, and marbling score were 2.65%, 0.04%, 1.58%, 1.58%, and 95.72%, respectively. Contribution to estimated unit price of steers by the same factors (backfat thickness, eye muscle area, carcass weights, feeding period, and marbling score) were 7.88%, 1.24%, 0.07%, 90.81%, and 95.72%, respectively. Slaughtering ages ranged from 26 to 36 months and the data were separated into each month for an 11 month period. The unit price of meat from Hanwoo slaughtered at 30 months was highest among groups. The lowest unit price was observed in the group belonging to the Hanwoo slaughtered at 36 months. In conclusion, of all contributing factors, marbling score affected unit price the most. Based on our results, it is recommended that the optimal slaughtering age be set at 30 months to maximize unit price. Moreover, the feeding of beef cattle past 30 months of age is not recommended because of the increase in feeding costs.

• 한국철도학회논문집
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• 제19권3호
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• pp.271-279
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• 2016

팬터그래프의 공력소음은 열차가 고속으로 주행할 때 발생하는 소음의 주요한 원인이다. 본 연구에서는 팬터그래프에 의한 공력소음 기여도를 분석하기 위하여 차세대고속열차(HEMU-430X)를 이용하여 시험을 수행하였다. 실제차량에서의 팬터그래프에 의한 소음의 주파수 특성을 분석하기 위하여, 350km/h와 400km/h 주행 시 전체차량의 음장가시화를 144채널 마이크로폰 어레이를 이용하여 수행하였다. 음장가시화 분석결과 팬터그래프의 소음은 250~400Hz 대역의 저주파 소음이 주로 기여함을 확인하였다. 또한 팬터그래프의 소음 기여도를 분석하기 위하여 팬터그래프의 올림 및 내림 시 소음도 차이를 단일 마이크로폰 시험을 통하여 비교분석하였다. 단일 마이크로폰 시험을 통한 팬터그래프 소음의 주요 주파수 특성은 315~400Hz와 1000~1250Hz 대역임을 확인 하였으며 이는 기존의 연구 결과 및 음장가시화 결과와 잘 일치하였다.

• 한국콘텐츠학회논문지
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• 제14권1호
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• pp.318-325
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• 2014

본 연구는 국세청에서 공시한 2012년도 공공의료원의 손익계산서 분석을 통해 이익 측면에서의 공공의료원의 경영 분석에 대해 살펴보고자 한 것이다. 국세청에 공시된 2012년 공공의료원의 재무제표 총 38건의 손익계산서 중 중복된 자료를 제외하고 매출액, 매출원가, 판매비와 관리비의 구분 표기가 가능한 자료를 추출하여 최종 22건의 자료를 이용하였다. 분석에는 의료이익, 공헌이익, 매출액 추세를 이용하였다. 공공의료원의 의료이익을 분석한 결과 22개 공공의료원의 평균 의료이익은 손실로 -4,678.9백만 원이었고, 평균공헌이익은 12,572.5백만 원, 매출이 증가한 의료원의 평균 매출 증가액은 1,299.1백만 원이었다. 결과적으로 공공의료원의 의료이익은 손실이나 공헌이익이 발생하고 있고, 아울러 약 2/3의 의료원에서 매출액 증가 추이를 보이는 바 개별 의료원 차원만을 고려한 경영 의사결정 시에는 신중한 접근이 필요하며, 공공의료원이 전국에 지역별 거점 기관의 성격으로 개설되어 있는 국가 공공의료망의 일부라는 측면에서 전사적 차원, 즉 국가적 차원에서의 경영분석과 판단이 이루어져야 함을 제안한다.

• 한국항만경제학회지
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• 제36권3호
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• pp.137-154
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• 2020

본 연구에서는 우리나라 주요 5개 항만배후단지의 성과를 분석하고 발전방안을 제시하고자 하였다. 성과분석은 단순한 물동량이나 입주기업의 유치수에서 벗어나 항만배후단지 입주기업 활성화, 항만물동량 기여, 국가경제기여 등 3개로 성과를 분류하고 세부적으로 입주기업 물동량 생산성, 총항만물동량 대비 항만배후단지 물동량 비율(컨테이너 화물, 총화물), 항만물동량 성장 기여율, 항만물동량 성장기여도, 물동량 부가가치 발생액, 일자리 창출 등 7개로 세분화하여 분석하였다. 모든 지표에서 있어 꾸준한 성장세를 보이고 있는 곳은 광양항, 울산항으로 나타났으며 광양항의 경우 5개 항만 중 가장 꾸준한 증가세를 보이고 있는 유일한 항만으로 분석되었다. 분석결과를 항만배후단지의 지속적인 성장을 위해 고부가가치 창출 배후단지 및 지역경제 기반한 특성화 배후단지 구축을 제안하였다.