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      • KCI등재

        초·중등 교과 교육의 정립과 발전을 위한 연구

        이경섭,이원희,장원조 한국교육과정학회 1996 교육과정연구 Vol.14 No.3

        This paper studies on the identification and development of each subject-centered education in primary and secondary school. Following is the summarizing conclusion. First, is order that each subject-centered content may contribute better to the goals of primary and secondary schools, it is necessary that the goals of the schools and subjects should relate colsely each other. To get the inter-relationship, there are three desirable ways to state the goals of school levels: educational taxonomy, hierarchical order, and each subject-centered. Second, This paper has set up a system of each subject-centered education in accordance with the three following principles. a. Balancing between the system of education and the meta-disciplinary system of each subject. b. Comprising the whole system with the system of education and the sub-system with meta-disciplinary system of each subject. c. Contributing to the practices of educational theory and the theorization of educational practices. Third, development of each subject-centered education calls for a long-term plan. The plan, based on the clarification of obstacles to the development and characterization of each subject, is to revitalize the activities and researches of each subject-centered education, to promote the qualities of experts in the area, to take administrative steps to produce the experts, and to increase exceedingly financial supports to this study.

      • KCI등재

        Fe-Si-Al 합금 분말 · 고무 복합 자성체의 전파 흡수 특성

        이경섭,윤여춘,최광보,김성수,이준영,Lee Kyung-Sub,Yoon Yeo-Choon,Choi Gwang-Bo,Kim Sung-Soo,Lee Jun-Young 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.2

        준 마이크로파 대역용 전자파 노이즈의 흡수체로서 자성 복합 시트를 개발하였다. Fe-Si-Al 자성 분말을 attrition mill을 이용해 편상화한 후 이것을 polymer와 혼합 분산시켜 전자파의 입사 방향에 수직한 방향으로 배향된 자성 복합 시트를 제조하였다. Attrition milling 시간이 긴 편상 분말일수록 제조된 자성 복합체의 유전율은 증가하나 투자율은 다소 감소하는 경향을 보인다. 또한 오랜 시간 milling한 편상 분말일수록 임피던스 정합 주파수는 저주파 쪽으로 이동하나 정합 주파수에서의 전자파 흡수율은 감소한다. 이러한 결과들로부터 복합 자성체의 유전율과 투자율의 주파수 특성을 제어하여 1.4 GHz에서 -8.2 dB의 반사 손실 특성을 갖는 두께 1.0 mm의 노이즈 흡수 시트를 개발하였다. A magnetic composite as noise absorber of quasi-microwave band was developed. The Fe-Si-Al alloy powder were forged by attrition mill to get flaky shape. The magnetic composite sheet was fabricated in which powders are dispersed in polymer and aligned in the direction perpendicular to electromagnetic wave propagation. The permittivity of magnetic composite is increased as forging time increasing, while the permeability is decreased slightly. The maximum attenuation peak of reflection loss is shifted to lower fiequency range as milling time increasing, and the value of maximum attenuation peak is to get smaller gradually. From these result, we could designed a noise absorber sheet (t=1.0 mm) for quasi-microwave band, which is impedance matched at 1.4 GHz with respect to -8.2 dB reflection 1055.

      • Fabrication of paraffin/reduced graphene oxide composite for heat storage

        이경섭,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

        In this study, paraffin/reduced graphene oxide (rGO) composites were fabricated by simple and environmentally friendly method. rGO filled with paraffin enhanced thermal properties of paraffin, which has low thermal conductivity (~0.2W/m·K). Paraffin/rGO composites were characterized by SEM, DSC, TGA, PPMS with different weight fraction of rGO in composite. Results indicate that when increasing weight fraction of rGO, thermal conductivity and stability also increased while there was no decrease in heat of fusion because of low fraction of rGO. Paraffin/rGO composite can be a good candidate for latent heat storage with enhanced thermal properties which can be utilized in even harsher environment.

      • 전극거리에 따른 Arachidic acid의 변위전류측정에 관한 연구

        이경섭 東新大學校 1998 論文集 Vol.10 No.-

        We have investigated a surface pressure, a displacement current and a charge measurement by distance of between electrode 1(top electrode) and water surface of organic monolayers. And the displacement current was generated during compression of arachidic acid monolayers at a air-water interface. The result from our work show that the displacement current of a Langmuir(L) film for Arachidic acid monolayers has the different maximum points according to the electrode distance. We are known that the displacement current and a charge was generated in inverse proportion to electrode distance d.

      • 하부 요관결석의 자연배출에 있어서 니페디핀의 치료효과

        이경섭 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

        요관 결석의 53%는 수분 섭취 등으로 자연배출이 되나 자연배출을 돕는 내과적 요법은 잘 정립되어 있지 않은 실정이다. 저자는 니페디핀과 같은 칼슘길항제가 평활근을 이완시킨다는데 착안하여 결석의 크기가 10 mm 이하였던 하부 요관결석 환자 50례를 대상으로 칼슘길항제인 니페디핀의 효과에 대해 전향적, 무작위, 이중맹검 분석을 하였다. 하루 2리터 이상의 수분섭취와 더불어 니페디핀을 하루 40 mg 섭취한 군(남자 16례, 여자 9례)과 하루 2리터 이상의 수분만을 섭취한 군(남자 17례, 여자 8례)을 분석한 결과는 다음과 같다. 1.수분섭취와 더불어 니페디핀을 하루 40 mg 섭취한 군의 평균 결석의 크기는 5.4±1.1 mm였고, 수분섭취만 한 군의 크기는 5.3±1.6 mm 였다. 2.수분섭취와 더불어 니페디핀을 하루 40 mg 섭취한 25례 중 20례는 결석이 배출되었고 5례는 배출되지 않았고(성공률 80%), 수분섭취만을 했던 25례 중 17례에서 결석이 배출되었고 8례에서는 배출되지 않아서(성공률 68%) 이 두 군 사이에 통계학적으로 유의한 차이가 있음을 알 수 있었다(p=0.03). 3.결석이 배출되었던 두 군 사이에 결석의 크기에서도 차이가 없었으며 통계학적 의의가 없었다(5.3±1.1, 5.1±1.7). 4.수분섭취와 더불어 니페디핀을 하루 40 mg 섭취하여 결석이 배출되었던 군의 직경은 5.3±1.1 mm, 결석이 배출되지 않았던 군의 직경은 5.8±1.3 mm였고, 수분섭취만을 했던 군 중 결석이 배출되었던 군의 직경은 5.1±1.7 mm, 결석이 배출되지 않았던 군의 직경은 5.6±1.6 mm로 결석이 배출되었던 군보다 배출되지 않았던 군에서 결석의 직경이 더 컸음을 알 수 있었다. 5.결석이 성공적으로 배출되었던 양군 사이에 배출되는데 걸리는 기간은 15.9일과 15.5일로 유의한 차이가 없었다. 이상의 결과로 저자는 하부 요관결석의 배출에 있어서 니페디핀을 이용한 요법이 효과적임을 알 수 있었으나 향 후 더 많은 예에서 관찰 해 보아야 할 것으로 생각된다. Almost 53% of the ureteral stones will pass spontaneously within 1 year. But expulsive medical therapy of uretral stones is not well established. To test efficacy of a calcium antagonist(nifedipine) in facilitating lower ureteral stone passage, I studied 50 patients with a unilateral ureteral radiopaque stone smaller than 10mm in maximum diameter. Patients were randomly treated 40mg oral nifedipine with 2 liter of pure water (16 men and 9 women) and 2 liter of pure water daily only(17 men and 8 women). The results were as follows : 1.The average maximum diameter of the stone was 5.4±1.1mm in nifedipine with pure water group and 5.3±1.6mm in pure water only group (not significant). 2.In nifedipine with pure water group, 20 patients had successfully passed and 5 failed(success rate 80%), compared to 17 and 8, respectively, in pure water only group (success rate 68%). This difference was significant statistically(p=0.03). 3.No difference was present in the maximum stone diameter among the successful case in nifedipine with pure water group and pure water group(5.3±1.1 and 5.1±1.7 mm, not significant). 4.In both groups the maximum diameter of the stone was larger in the failed than in the successful case in nifedipine with pure water group and pure water group(nifedipine with pure water group : 5.8±1.3mm vs 5.3±1.1mm and pure water group : 5.6±1.6mm vas 5.1±1.7 mm). 5.In both groups the mean tinterval for stone passage in the successful cases was not different(nifedipine with pure water group : 15.9 days, pure water group : 15.5 days). 6.I concluded that expulsive medical treatment with water and nifedipine is effective in facilitating lower ureterl stone passage

      • KCI등재

        외상성 신동맥 색전증 3례

        이경섭 대한외상학회 1999 大韓外傷學會誌 Vol.12 No.1

        Renal artery thrombosis may result from external trauma of a blunt or penetrating nature. Such injury is thought by some to be due to rapid deceleration resulting in the stretching of the renal vasculature, disruption of the arterial intima-the least elastic layer of the arterial waU and eventual thrombosis. Blunt arterial injury occurs more commonly on the left than right because of the mobile kidney with acute angulation of the left renal artery at its aortorenal junction. The treatment of renal artery thrombosis is controversial, with physicians opinions divided between prompt surgical exploration with vascular repair and clinical observation. I experienced 3 cases of traumatic renal artery thrombosis and report them with a brief review of the literature.

      • KCI등재

        음낭손상의 진단에 있어서 신체검사와 초음파검사의 진단적 가치

        이경섭 대한외상학회 1998 大韓外傷學會誌 Vol.11 No.2

        Backgrounds: The value of physical examination and ultrasonography in scrotal trauma has been questioned in asmuch as the injuried testis should always be explored smgically. The incidence of testicular rupture is nearly half in all cases of blunt scrotal trauma. Physical examination is first method of diagnosis in sctotal injury but it was limited in case of severe sciotal swelling. However, ultrasonography plays as important role in the diagnosis and follow up of patients with blunt scrotal trauma. Methods: We evaluated 35 operated cases of blunt scrotal trauma all of them performed physical examination and ultrasonography preoperetively. We reviewed 35 operated cases of blunt scrotal trauma, 26 cases of them revealed testicular rupture, simple hematocele and scrotal wall hematocele in 9. In 3 cases orchiectomy was necessary due to severe testicular rupture. Results : From our experience the sensitivity of physical examination was 96.2%, with a 22.2% specificity, with a 78.1% positive predictive value. The sensitivity of ultrasonography was 100%, with a 55.6% specificity, with a 86.7% positive predictive value. Conclusions: Therefore, we concluded that ultrasonography used in canjunction with a precise physical examination is accurate and valuable diagnostic method.

      • KCI등재

        방광파열 환자의 임상적 분석과 예후에 미치는 인자

        이경섭 대한외상학회 1996 大韓外傷學會誌 Vol.9 No.2

        A clinical analysis was made on 46 patients with bladder rupture in the department of urology, at dongguk university hospital from Jan. 1990 to Dec. 1995. The following results were obtained: 1. The 46 cases were comprised of 30 males and 16 females(male:female=1.87:1). The most prevalent age group of bladder rupture was 30 to 39 years. 2. The patients with intraperitoneal bladder rupture were more common than those with extraperitoneal bladder rupture. The causes of bladder rupture were motor vehicle accident in 23, direct blow in 13, iatrogenic cause in 4, fall down in 4, and penetrating injury in 2. Among these 16(34. 8%) cases were associated with alcohol drinking. 3. The most common associated injury was pelvic bone fracture(41.3%). 4. The postoperative complications occurred in 6(13.0%): urine leakage from bladder in 3, intestinal obstruction in 3. Among the cases with urine leakage, 2 had wide separation of symphisis pubis and 1 had electrical injury. Among the cases with intestinal obstruction, 2 were mechanical ileus, which required surgical exploration. 5. Mean delayed time from injury to operation in 40 patients without complications was 12. 1 hours, and that in 6 patients with complications were 26. 7 hours. So complicated group had longer delayed time than non-complicated group. From these results, it is very important to shorten the time from injury to operation to minimize post-operative complications. In patients with bladder rupture associated with wide separation of symphisis pubis, it would be better to consider the external fixator application to the pelvic bone and urinary drainage via suprapubic cystostomy.

      • 변위전류법에 의한 지질단분자막의 전기특성에 관한 연구

        이경섭,권영수 한국전기전자재료학회 1996 電氣電子材料學會誌 Vol.9 No.5

        Maxwell-Displacement-Current(MDC) measuring technique has been applied to the study of monolayers of Dilauroylphosphatidylcholine (L-.alpha.-DLPC) and Dimyristoylphosphatidylcholine (L-.alpha.-DMPC). The displacement current was generated from monolayers on a water surface by monolayer compression. Displacement current was generated when the area per molecule was about 250.angs.$^{2}$, 280.angs.$^{2}$. Displacement current was generated in the gas state, gas/liquid state, and liquid state in the course of monolayer compression. The orientational change of molecules in monolayers was discussed on the basis of the MDCs obtained. Finally, we measured differential thermal analysis of sample.

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