[기업 인터뷰] 라온시큐어 서비스 부문 총괄 정현철 사장

정현철 한국정보처리학회 2024 정보처리학회지 Vol.31 No.1

췌장암-항암 치료가 필요한가?

정현철 대한내과학회 1999 대한내과학회지 Vol.57 No.4

Solvent-Ratio Dependency of Polymorphism of Silver(I) Complexes Containing 1,2,3-Tris(Isoniconitoyloxy)Benzene

정현철,노태환 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.11

Self-assembly of AgClO4 with 1,2,3-tris(isonicotinoyloxy)benzene (L) in a mixture of ethanol and acetone in a 1:1 volume ratio in refrigerator afforded concomitantly two kinds of thin- and block-shaped colorless crystals consisting of {[Ag(L)]ClO4·0.5CH3CH2OH} n and {[Ag(L)]ClO4·0.5CH3CH2OH·2Me2CO} n, respectively, in a 3:2 ratio. By contrast, self-assembly at room temperature yielded thin crystals exclusively. At 5 °C, in particular, the self-assembly in 3:1 and 1:2 ethanol/acetone solutions yielded thin- and block-shaped crystals, respectively, suggesting that discrimination of the two products can be controlled by the solvent volume ratio and crystallization temperature. The products' crystal structures and physicochemical properties were fully characterized by means of single-crystal X-ray diffraction measurement, thermal analysis, and infrared (IR) data.

국내자본시장의 국제자본시장과의 통합화 정도에 관한 연구

정현철 한국국제경영관리학회 2007 국제경영리뷰 Vol.11 No.3

국가간의 정치/경제적 통합화추세가 자본시장에도 예외는 아니어서 일반적으로 자본시장통합화가 이루어지고 있는 것으로 알려지고 있다. 본 연구는 국내자본시장의 국제자본시장과의 통합화정도를 국가차원(country-level) 뿐만 아니라, 기업규모별(firm-level)로 또한 산업별(industry-level)로 측정하였다. 연구결과 국제자본자산가격결정모형(ICAPM)이 성립되지 않는 것으로 나타났으며, 국가차원에서는 국내시장이 국제시장과 통합되어 있음을 보이고 있다. 반면 산업별/기업규모별 차원에서의 분석 결과는 시장통합화 정도가 산업 및 기업규모별로 차별화를 보이고 있다. 이러한 결과는 국제분산투자효과의 극대화를 추구하는 국제투자자들이 지역적 분산 뿐 아니라 산업별/기업특성별 분산투자전략을 수립할 필요성을 시사한다. Many empirical studies show global financial markets have been integrated and the process is on-going. Most of the previous studies, however, looked at this market integration at the market level. There are many reasons to raise questions about market integration across industry sectors and firms. We attempt to answer these questions in this paper. We investigate the degree of market integration between domestic and global financial markets using industry- and firm-level data as well as market-level data. Our results first reveals International Capital Asset Pricing Model (ICAPM) doesn't hold. At the market level, secondly, domestic financial market is apparently integrated with global financial market. On the other hand, we found significant cross-sectional variations in market integration across industry sectors and firm characteristics. This study eventually provides a better understanding of the various market integration, which is the one of the most important factors for foreign investors seeking international diversifications to maximize their returns or minimize their investment risks.

한국영재교육에서 소집단 탐구활동에 대한 인식 분석

정현철,박영신,황동주 한국지구과학회 2008 韓國地球科學會誌 Vol.29 No.2

This study quantitatively investigated the actual situations and perceptions of gifted students and their teachers during small group inquiry activities in Korea. Some 1,670 gifted math students and 1,732 gifted science students, as well as 614 of their teachers were selected through random sampling to participate in this study. Data were collected by means of a survey developed by the researchers of this study, based on reviews of literature related to inquiry and small group cooperative learning. The results were as follows: (1) In Korean gifted education, small group inquiry activities were frequently used as teaching and learning strategies, and both the students and teachers perceived its effects to be very positive in terms of cognition and affection. (2) Gifted education teachers emphasized the development of students' procedural inquiry skills as well as logical thinking skills, whereas they were indifferent to the essential elements of small group cooperative learning and therefore the lessons did not surpass the level of traditional group activities. (3) The fact that the actual small group inquiry activities did not reflect the characteristics of well-organized small group activities is due to a lack of knowledge on the teacher's part as to effective teaching strategies concerning cooperative learning. This study implies that gifted education teachers require the opportunity to reflect on and develop their knowledge and understanding of small group inquiry activities through professionally developed programs in order to maximize the effectiveness of small group inquiry activities in gifted education. 이 연구는 우리나라 영재교육에서의 소그룹 탐구활동에서의 실태 및 인식을 정량적으로 조사한 것이다. 임의 표본으로 전국의 16개 도시의 영재담당 교사 614명, 수학에서는 1,670명, 과학에서는 1,732의 영재학생이 이 연구에 참여하였다. 자료 수집을 위하여 본 연구의 연구자들은 기존의 관련 문헌을 바탕으로 협동학습 형태의 소그룹활동 및 탐구활동에 대한 설문지를 개발하여 실태 및 인식을 조사하였다. 이 연구의 결과는 (1) 현 한국의 영재교육에서의 소그룹 탐구활동은 교실 내에서 효과적인 학습 및 교수법으로 빈번하게 사용되고 있었다. 또한 한국영재교육에서의 소그룹 탐구활동에 대해 교사 및 영재학생들은 인지적 및 정의적 측면에서 긍정적으로 인식하고 있음에도 불구하고, (2) 실질적으로 학생간의 상호작용을 활발하게 도모하기위한 교수법이나 효과적인 조구성을 위한 교수법은 사용하지 않았다. 이는 영재교육에서 이루어지고 있는 소그룹 탐구활동은 단순한 전통적인 그룹 활동에 불과하다는 것을 지적하며, (3) 이는 영재담당 교사들의 관련 이해 및 지식이 충분하지 않아 효과적으로 적용할 수 있는 교수법의 부족에서 오는 것이라 할 수 있겠다. 한국영재교육에서의 효과적인 소그룹 탐구활동의 적용을 위해서는 영재담당 교사연수를 통해 소그룹 탐구활동에 대한 이해도 및 지식을 반성하고 개발하며 또한, 학생들의 상호작용을 극대화할 수 있는 관련된 교수법 및 교수 모델을 창안할 수 있는 기회가 제공되어야 할 것이다.

늘보리 분말을 첨가한 식빵의 품질특성

정현철 경주지역발전협의회 부설 경주발전연구원 2013 경주연구 Vol.22 No.1

급성 신우신염에 합병된 급성 신부전증 2예

정현철,이우철,이수봉,김도훈,곽임수,나하연,송상헌,배우형,박삼석 대한내과학회 2001 대한내과학회지 Vol.60 No.3

Acute renal failure secondary to acute pyelonephritis is developed rarely. But acute pyelonephritis is considered in differential diagnosis of acute renal failure, particularly in elderly patient. Elderly patient showed subtle symptoms or signs of infections and can be missed easily. We experienced two cases of acute renal failure secondary to acute pyelonephritis. In first case, one patient complained fever, chilling and right flank pain for 10 days. Three repeated blood and urine cultures showed E. coli, respectively. At admission serum creatinine showed 2.4 mg/dL and thereafter increased to 4.5 mg/dL, and then decreased to 1.7 mg/dL with antibiotic therapy and hydration at 14 days of admission. In second case, patient complained right flank pain, costovertebral tenderness and urinary difficulty at admission. Two repeated blood culture showed no growth, two repeated urine culture showed $gt; 105 ml/dL of E. coli. At admission serum creatinine level was 2.69 mg/dL and then decreased to 1.7 mg/dL with antibiotic therapy and hydration at 14 days of admission. Acute pyelonephritis should be considered in differential diagnosis of acute renal failure in the elder ages, although this developed rarely. Early recognition and appropriate antibiotic treatment helps recover acute renal failure secondary to acute pyelonephritis.(Korean J Med 60:254-259, 2001)

An Empirical Study on the Application of Lead-Acid Batteries to ESSs and Performance Improvement Methods

정현철,허훈 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.5

In this paper, an approach to extend the life of lead-acid batteries through the elimination of sulfation with “rest time” using the pulse current of a conventional DPV (Differential Pulse Voltammetry) method is discussed. A new rest time without “0” current in “saw-tooth” pattern pulses is proposed to overcome the “0” current (blackout period), which is a shortcoming of DPV. This will enable the proposed method to be used in the loaded state. In the proposed approach, ESSs (Energy Storage Systems) were discharged for 5 h twice per day for 6 months on weekdays. To observe the changes in the lifespan of the systems, for the same period, the changes in the impedances of lead-acid batteries which were being charged e without charging and discharging were measure and compared. This study is focused on determining the effectiveness of lead-acid batteries as ESSs.

혈중 hCG 농도가 낮은 자궁외임신에서 기대요법의 성공률(초)

정현철,윤영선,조금준,김해중 대한산부인과학회 2009 대한산부인과학회 학술대회 Vol.95 No.-

Corrigendum: Lymphangiographic Interventions to Manage Postoperative Chylothorax

정현철,안효영,권훈,김영대,조정수,엄중섭 대한흉부외과학회 2020 Journal of Chest Surgery (J Chest Surg) Vol.53 No.2