대학수학능력시험(2006~2010년) 한국지리 평가문항에 나타난 지리도해력 분석

한경찬 고려대학교 교과교육연구소 2010 교과교육연구 Vol.3 No.2

승용디젤엔진의 closed-loop 연소압기반 실시간 연소제어 기술 개발

한경찬(Kyoungchan Han),유준(Jun Yu),박승일(Seungil Park),유성은(Seungeun Yu),민경덕(Kyoungdoug Min),최회명(Hoimyung Choi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

As vehicle emission regulations are becoming more severe, various engine subsystems and control technologies are being introduced to meet the stringent demands of these regulations. However, because the diesel engine combustion is initiated by auto-ignition, control of the combustion is considerably more difficult. Moreover, there must be cylinder-to-cylinder deviations in diesel combustion engines due to tolerances of the engine hardware and variations in fuel quality. In this study, a ‘closed-loop combustion control’ method was used to accomplish real time combustion control. To achieve the combustion control, MFB 50 (burned mass fraction 50%) was initially determined by analyzing in-cylinder pressure in the diesel engine. Main injection timing was then corrected to sustain the target MFB50 using a in-house control logic. The control logic was demonstrated at steady and transient conditions including NEDC mode. Results from the control method proved possibilities to minimize variation effects of diesel fuel quality and improve fuel efficiency and emissions.

제주도 송전철탑이 토지가격에 미치는 영향

한경찬 ( Kyung Chan Han ),정수연 ( Su Yeon Jung ) 한국감정평가학회 2013 감정평가학논집 Vol.12 No.2

본 연구는 송전탑의 존재가 토지가격의 하락에 영향을 미친다는 것을 실증적으로 보이는 것을 목적으로 한다. 송전탑의 입지와 관련하여 늘 문제가 되는 것은 보상에 관한 것이다. 본 연구는 송전탑관련 분쟁에 있어 보상의 송전탑이 유발하는 자산가치의 하락에 대한 믿음을 실증적으로 객관화하고자 하였다. 이를 위하여 제주도지역의 송전탑 분포를 조사하고 제주도 읍면동 지역 중 도시화가 가장 진전된 지역인 연동지역과 발달정도가 상대적으로 덜한 봉개지역을 대상으로 회귀분석모형을 분석하였다. 종속변수로는 토지가격을 설정하였고 설명변수로는 본 연구의 주요관심변수인 송전탑까지의 거리외에 토지가격특성요인들을 고려하였다. 분석결과 연동지역은 송전탑으로부터의 거리가 멀어질수록 0.94%의 가격상승이, 그리고 봉개동지역은 0.82%의 가격상승이 발생하는 것으로 나타났다. The purpose of this study is to investigate the effect of power transmission towers on land price in Jeju-do. For this, we chose Yeondong the most developed area, and Bonggaedong the least developed area among villages and towns in Jeju.do, And we analyzed the areas in order to see the effects of transmission tower on land price. The number of lots analyzed was 124 in the Yeondong area and 45 in the Bonggae area, And SPSS 12.0 was used for regression analysis. We took the logarithm of dependent variable land price, And also took the logarithm of distance from an electrical pylon measured using a GIS program. The major contents of this study are summarized as follows. In the results of analyzing the effect of distance from an transmission tower on land price in the Yeondong area using regression analysis, R² indicating the goodness.of.fit of the model was 0.816, showing quite high reliability, And the estimate of each variable was all significant at p<0.1. The effect of distance from an electrical pylon on land price was significant at p<0.1, and the coefficient was positive (+). That is, when the distance from an electrical pylon was long it had a land price rising effect of 0.94%. In the results of regression analysis for the Bonggae.dong model, R² was 0.833, the effect of distance from an transmission tower on land price was significant at p<0.1, and the coefficient was positive (+).That is, when the distance from an electrical pylon was long it had a land price rising effect of 0.82%.

지역 맞춤형 소규모 다용도 저수지 도입

한경찬(Han, Kyoung Chan),배득렬(Bae, Deuk Ryeol),한성수(Han, Seong Su),서광석(Seo, Kwang Seok) 대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10

북미 승용디젤엔진 연소압 기반 실시간 연소제어 기술

한경찬(Kyoungchan Han),유성은(Seungeun Yu),남기훈(Kihoon Nam),최대(Dae Choi),유준(Jun Yu) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11

지역 맞춤형 소규모 다용도 저수지 도입

대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10

원가의 형태와 경영자 유형

이용규(Yongkyu Lee),한경찬(Kyoung Chan Han) 한국관리회계학회 2005 관리회계연구 Vol.5 No.2

최근 많은 연구들에서 활동수준이 증가할 때와 감소할 때 원가의 변화 정도에 차이가 있다는 원가행태의 비대칭성 및 그 요인에 대한 실증적인 증거를 제시하고 있다. 본 연구에서는 비대칭적 원가행태가 결국 경영자의 의사결정으로부터 기인된다는 점에 착안하여 대리인이론의 관점에서 비대칭적 원가행태를 살펴보고자 한다. 대리인이론에 의하면 경영자의 의사결정은 반드시 기업의 목적에 부합하는 방향으로 이루어진다고 볼 수 없으며 오히려 그 경영자의 성과평가나 보상의 관점에서 경영자에게 유리한 방향으로 이루어진다고 할 수 있다 경영자의 의사결정과 원가행태의 양상을 파악하기 위해서는 경영자의 기정자원에 대한 의사 결정에 영향을 주는 요소를 파악한 후 이들 요소가 의사결정에 어느 방향으로 영향을 주게 되며 그 결과 원가의 행태에 어떠한 영향을 주는 지를 검증해야 할 것이다. 그러나 본 연구에서는 현실적으로 경영자의 의사결정에 영향을 주는 요소를 일일이 파악하는 것이 어렵다는 점을 감안하여 이들에 대한 대리변수(proxy)로 전문경영자와 소유경영자로 구분한 경영자유형 변수를 사용한다. 분석결과에 의하면 소유경영자기업과 전문경영자기업에서 제품제조원가의 매출액변화에 대한 행태는 상반되는 결과를 보이고 있다. 즉, 소유경영자기업은 하방경직성(상방탄력성)을 보이며 전문경영자기업은 하방탄력성(상방경직성)을 보이고 있다. 또한 각 기업의 부채비율로 측정한 채권자의 영향력이 소유경영자기업의 하방경직성과 전문경영자기업의 하방탄력성을 각각 완화시켜주고 있는 것으로 확인되었다. 한편 소유경영자기업에 있어 경영자의 지분율이 상승할수록 하방경직성이 완화되는 현상도 확인되었다. 이러한 분석결과는 소유경영자와 전문경영자의 의사결정이 서로 다른 양상을 보이며 이들의 의사결정에 영향을 주는 요소 예를 들어, 성과평가 및 보상체계 등과 관련성이 있음을 간접적으로 시사한다고 할 수 있다. Recent papers have provided evidences on asymmetric cost behavior, called stickiness and various drivers of stickiness. From the perspective of agency theory where managers make corporate decision with respect to their own interest, managers' selfish decision specially on committed resources may result some aspect cost behavior. In this paper we try to explain the relationship between what affects managers' decision and cost behavior. Many factors affect manager's selfish decision; utility function, risk aversion, performance evaluation and reward are among others. Since these are difficult to identify or measure and hardly possible to use in the empirical tests, we use binary variable of owner-manager / employed manager as a poxy encompassing all these decision affecting factors. The results show contrasting cost behaviors between owner-manager / employed manager. There appears to be downward inelasticity in the owner-manager firms. and downward elasticity in the employed manager firms. This means owner-manager reduces committed resources when sales decline in less proportion than when increasing committed resources during sale increase, which has been observed in many papers. But in the employed manager firms, they seem to reduce their resources more quickly than in owner-manager firms, and in more proportion than in the opposite sale-increasing situation. Additionally we find debt ratio as a proxy variable of creditor influences alleviates both downward inelastic cost behavior of owner-manager firms and that of downward elasticity in employed manager firms. Also as owner-manager have more outstanding shares, degree of downward inelasticity is declining. All the results modestly imply that cost behavior appears to be related to manager's decision affecting factors.

Standardized Cirsium setidens Nakai Ethanolic Extract Suppresses Adipogenesis and Regulates Lipid Metabolisms in 3T3-L1 Adipocytes and C57BL/6J Mice Fed High-Fat Diets

조봉연,박미령,이진하,라문진,한경찬,강일준,이옥환 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.8

Cirsium setidens Nakai, a wild perennial herb, grows mainly in Gangwon province, Korea, and has been reported to contain bioactive ingredients with various medicinal activities, including the treatment of edema, bleeding, and hemoptysis. However, the potential antiobesity effects of C. setidens Nakai have not been fully investigated. This study evaluated the antiobesity effect of standardized C. setidens Nakai ethanolic extract (CNE) in 3T3-L1 adipocytes and in obese C57BL/6J mice fed a high-fat diet. CNE suppressed the expression of lipogenic genes and increased the expression of lipolytic genes. The antiadipogenic and antilipogenic effects of CNE appear to be mediated by the inhibition of peroxisome proliferator-activated receptor γ (PPARγ) and CCAAT/enhancer-binding protein (C/EBP) expressions. Moreover, CNE stimulated fatty acid oxidation in an AMPK-dependent manner. CNE-treated groups of C57BL/6J mice showed reduced body weights and adipose tissue weight and improved serum lipid profiles through the downregulation of PPARγ, C/EBPα, fatty acid binding protein 4 (FABP4), sterol regulatory element binding protein-1c (SREBP-1c), and fatty acid synthase (FAS) and the upregulation of adiponectin and carnitine palmitoyltransferase-1 (CPT-1) in obese C57BL/6J mice fed a high-fat diet. These results suggest that CNE may have an antiobesity effect on adipogenesis and lipid metabolism in vitro and in vivo and present the possibility of developing a treatment for obesity with nontoxic natural resources.

슈퍼차저 적용에 의한 다운사이징 디젤 엔진의 연비 향상

김형민(Hyungmin Kim),남기훈(Kihoon Nam),한경찬(Kyoungchan Han),유준(Jun Yu),전종만(Jongman Jeon) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11

산지별 고려엉겅퀴의 Pectolinarin 함량 및 항산화 활성

조봉연,이진하,라문진,김선영,강일준,한경찬,이옥환 한국식품위생안전성학회 2016 한국식품위생안전성학회지 Vol.31 No.3

This study was performed to provide basic data of Cirsium setidens Nakai by cultivars that will be applied for development of functional foods and ingredients. We assessed pectiolinarin content, total flavonoids content and antioxidant effects (DPPH radical scavenging activity and ORAC assay) of C. setidens Nakai. Our results showed that the pectolinarin and total flavonoids contents of C. setidens Nakai by cultivars ranged from 3.95±0.05 to 7.29±0.07 mg/g and from 40.42±0.91 to 76.70±2.24 mg pectolinarin equivalent (PNE)/g, respectively. Among C. setidens Nakai by cultivars, the pectolinarin content was highest in GW-D extract. Futhermore, the DPPH radical scavenging activity of C. setidens Nakai ranged from 31.25 to 81.93%, respectively. The oxygen radical absorbance capacity (ORAC) value was highest in GW-D and GW-E extracts (514.49 and 501.73 μM TE/g, respectively). These results suggest that C. setidens Nakai extract could be considered as a good sources of natural antioxidants and functional food ingredients.