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- 저자 : 안일환(Il Hwan An) (검색결과 5 건)
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환경성과와 재무성과의 상관관계에 관한 실증연구 -우리나라 상장 제조업체를 중심으로-
홍종호 ( Jong Ho Hong ),안일환 ( Il Hwan An ) 한국환경정책평가연구원 2007 환경정책연구 Vol.6 No.4
본 연구에서는 우리나라의 상장 제조업체를 대상으로 환경성과와 재무성과 간의 상관관계에 대해 실증분석을 수행하였다. 본 주제에 대한 기존의 해외 연구들은 서로 상충된 결과를 보이고 있다. 국내에서는 이와 관련하여 충분한 연구가 진행되지 못하였는데, 그 주된 이유는 환경성과에 대한 신뢰성 있는 자료의 부재이다. 본 연구에서는 현재 여건에서 확보할 수 있는 객관적인 기업별 환경성과 자료를 최대한 확보하고자 하였다. 환경성과 자료는 친환경성과와 반환경성과 지표로 대별하였으며, 각각에 대해 대표적인 재무성과 지표와의 상관성을 분석하였다. 분석결과 대부분의 비교 항목들에서 환경성과와 재무성과 간의 양의 상관성을 시사하는 통계치를 얻을 수 있었다. 이는 동일한 방법론을 적용한 해외 연구사례와 비교해 보았을 때 고무적인 결과라고 할 수 있다. 한편 친환경성과 지표와 재무성과 지표 간의 양의 상관성이 반환경성과 지표와 재무성과 지표에 비해 통계적으로 보다 신뢰성 있는 결과를 제시하고 있음을 확인하였다. We try to analyze the relationship between environmental and financial performance in the Korean manufacturing sector. The lack of reliable information on company-level environmental performance in Korea has inhibited research on this subject. This paper utilizes an objective data set called ``Monthly Environmental Violations Report,`` published by the Korean Ministry of Environment, among others, in measuring the environmental performance of the listed companies. The result shows that low polluters tend to perform better financially than high polluters. In addition, the correlation between positive environmental performance and financial performance turns out to be statistically more significant than negative environmental and financial performance.
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영구자석 동기전동기 능동단락 회로 동작에 감자해석 관한 연구
유회총(Huai Cong Liu),김우정(WooJung Kim),문종주(JongJoo Moon),안일환(Il Hwan An) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
This paper investigates the behavior of active short circuit(ASC) in order to protect and inverter and a motor when any faults occur on inverter system at high-speed operation region of motor. The implementation of ASC function is to control the inverter output to be a zero vector which state can be named three phases short(3PS) in the fault condition. The ASC function causes unintended brake torque in the motor and the freewheeling current between the inverter and the motor which is called ASC-current. In general, the ASC current will be several times higher than the maximum power current. Therefore, the magnets selected for the motor design must ensure that they will not be demagnetized under the ASC current. This paper introduces an 8-pole 100kW permanent magnet synchronous motor, discussed the maximum current value of the motor in ASC state, and conducts finite element analysis of demagnetization through dynamic and static methods to verify the safety of permanent magnet selection.
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탄소섬유 강화 플라스틱 (CFRP) 적용 EV 구동모터 회전자의 특성분석
유회총(Huai Cong Liu),박장수(Jang Soo park),안일환(Il Hwan An) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
This paper investigates and compare of EV drive motor rotor applied with carbon fiber reinforced plastic (CFRP). Recently, interior permanent magnet synchronous Motor (IPMSM) has incorporated a CFRP sleeve that wraps around the rotor. The sleeve keeps the rotor assembly from flying apart at high rotational speeds. The ipmsm with cfrp sleeve can reduce the magnetic flux leakage by removing the rib and bridge in the rotor to improve the performance of the motor, but it needs to be discussed and studied to minimize the strength performance of cfrp sleeve and cfrp and the change of electromagnetic performance. In this paper, the electromagnetic and mechanical properties of IPMSM motors with CFRP winding sleeves were compared through finite element method (FEM). A sleeve thickness of 0.5 mm was selected to minimize leakage flux that satisfies rotational stiffness according to the required maximum speed. In addition, magnetic torque, reluctance torque, and d-q axis inductance of CFRP winding sleeve applied IPMSM were analyzed and compared through FEM. By minimizing the d-axis inductance, a reluctance-maximizing model capable of high-speed driving was selected. As a result, it will be a useful reference in the development of the CFRP winding sleeve applied IPMSM.
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성경험이 없는 전신홍반루푸스 환자에서 발생된 뾰족 콘딜로마
김용준 ( Yong Jun Kim ),변창규 ( Chang Kyoo Byon ),김은석 ( Eun Seok Kim ),김현정 ( Hyun Jeong Kim ),정일환 ( Il Hwan Jeong ),안원석 ( Won Suk An ),이상엽 ( Sang Yeob Lee ),이성원 ( Sung Won Lee ),정원태 ( Won Tae Chung ) 대한류마티스학회 2014 대한류마티스학회지 Vol.21 No.2
Anogenital infection with human papillomavirus (HPV) is one of the most common sexually transmitted infections worldwide. The majority of HPV infections are transient and subclinical, with subsequent clearance by the immune system. However, in some individuals, especially those with impaired immunity, HPV infection may persist and result in condyloma acuminatum, pre-cancerous cervical abnormalities, as well as cervical cancer. Because of the intrinsic immunological aberrations and immunosuppressive treatment, patients with systemic lupus erythematosus (SLE) have higher prevalence of anogenital HPV infection, and SLE itself appears to be a major risk factor for HPV infection. HPV infection is sexually transmitted via genital contact; autogenesis of condyloma acuminatum without sexual contact is rare. In this case, a 27-year old virgin female with SLE was admitted to our clinic, presenting anogenital condyloma acuminata. It report that SLE patient can have a disease of anogenital HPV infection, despite the lack of sexual contact. Therefore, we recommend that patients with SLE have regular gynecological evaluations, in addition to prophylactic HPV vaccinations.
ScienceON
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