• 한국벤처창업학회:학술대회논문집
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• 한국벤처창업학회 2007년도 춘계학술대회
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• pp.313-328
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• 2007

본 연구에서는 창업보육센터 자체의 조직과 창업보육센터에 입주하여 기술개발과 경제활동에 힘쓰고 있는 입주업체의 조직과 구성원들의 운영 활동의 문제점을 살펴보고, 두 조직간의 상호관계를 도출하였다. 또한 나타난 제반 문제점들에 대한 해결방안 및 조직의 구성, 체계적인 관리방법 등을 통해 지역 창업보육센터의 자립 경영 방향을 제시하였다. 이를 구체적으로 살펴보기 위하여 창업보육센터 입주기업들을 유형별로 4가지 형태로 나누어 분류하였고, 실제 한 대학의 예를 들어 각 유형 별 기업의 특징과 장 단점 그리고 발전방안을 제시하였다.

• 한국주조공학회지
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• 제24권2호
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• pp.108-114
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• 2004

$Al_2O_3$, SiC reinforced Al matrix composites were fabricated by centrifugal spray casting method and their wear resistance characteristics have been studied. Particles are generally uniformly distributed in the microstructure of as-cast specimens. In order to investigate the effect of secondary deformation, hot rolling was performed for each specimen of pure Al matrix composites with a reduction of 10, 20, 30, 40 and 50% at $400{\sim}500^{\circ}C$, respectively. Microstructure of specimen showed that particle distribution density and hardness increased because of increasing of reduction ratio. Wear test with a various sliding velocity of 1.98, 2.38, 2.88 and 3.53m/sec showed that the wear resistance characterization of composite improved remarkably compared to the normal alloy and performs without reinforced particles. Microstructural observation for the worn surface of pure Al specimens without particles showed that a change in wear mechanism seemed to separate layer by surface fatigue. In other case of Al composite reinforced with $Al_2O_3$ and SiC, the grinder type of wear mechanism was shown.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2008년도 추계학술발표논문집
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• pp.201-203
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• 2008

ITO 투명전극을 양극으로 사용하고 PEDOT:PSS 고분자 물질위에 PVK와 Ir(ppy)3를 각각 host와 dopant로 사용하여 고분자 발광다이오드를 제작하였다. 전자 수송층의 역할로 TPBI, 음극으로 Al을 증착하여 최종적으로 ITO/PEDOT:PSS/PVK:Ir(ppy)3/TPBI/LiF/Al 구조를 갖는 녹색 인광 고분자 유기발광소자(PhPLED)를 제작하였다. 제작 된 소자의 발광부 dopant인 Ir(ppy)3도핑 농도에 따른 전기적 광학적 특성을 평가하였다. PVK:Ir(ppy)3를 host와 dopant system으로 dopant Ir(ppy)3의 도핑 양을 0.5 wt%에서2.5 wt%까지 씩 변화시키면서 최적의 농도를 찾고자 하였다. TPBI를 전자 수송층으로 사용 하였을 경우 최대 휘도는 약 8600 cd/$m^2$ (at 8V)이고, 전류밀도는 337mA/$cm^2$ 를 나타내었다.

• 분석과학
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• 제11권6호
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• pp.413-420
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• 1998

물-메탄올 혼합 용액과 계면활성제 용액에서 1-나프탈렌아세트산 나트륨염, 1-나프탈렌말론산 나트륨염, 2-나프탈렌아세트산 나트륨염과 2-나프탈렌프로피온산 나트륨염과 같은 나프탈렌 나트륨 유도체들의 소수성 상호작용에 대해서 연구하였다. 물-메탄올 혼합 용액에서 소수성 상호작용을 측정하였고, 방출선은 red shift가 일어났다. 양이온 계면활성제인 세틸트리메틸암모늄 브롬화 용액에서도 흡수, 방출선은 red shift됨을 보여주었다.

• Food Science and Biotechnology
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• 제18권1호
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• pp.218-222
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• 2009

Ability of water extract from Prunella vulgaris Labiatae to stimulate immune system and inhibit tumor metastasis in mice was assessed. In experimental lung metastasis, prophylactic intravenous (i.v.) administration of water extract from P. vulgaris significantly inhibited lung metastasis in a dose-dependant manner. Peritoneal macrophages stimulated with P. vulgaris produced various cytokines such as tumor necrosis factor (TNF)-$\alpha$ and interlukin (IL)-12 as well as induced tumoricidal activity. In an assay for natural killer (NK) cell activity, i.v. administration of P. vulgaris significantly augmented NK cytotoxicity. The depletion of NK cells by injection of rabbit anti-asialo GM1 serum abolished the inhibitory effect of P. vulgaris on lung metastasis of colon26-M3.1 cells. These data demonstrate that P. vulgaris activate innate immune system to inhibit the growth of foreign materials including tumor cells in mice.

• Nuclear Engineering and Technology
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• 제40권6호
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• pp.439-450
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• 2008

The KSTAR device succeeded in first plasma generation on $13^{th}$ June of 2008 through comprehensive system test and commissioning. Among various kinds of the key factors that decisively affected the project, success in the construction and assembly of the major tokamak structure was most important one. Every engineering aspects of each structure were finally confirmed in the integrated commissioning period, and there were no severe troubles and failures prevented the KSTAR device from operating during the commissioning and the first plasma experiments. As a result, all of the experiences and technologies achieved through the KSTAR construction process are expected to be important fundamentals for future construction projects of superconducting fusion devices. This paper summarizes key engineering features of the major structures and of the machine assembly.

• Nuclear Engineering and Technology
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• 제41권4호
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• pp.477-492
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• 2009

In this paper, we discuss the experiences during the preparation of the Wolsong Low- and Intermediate-Level Radioactive Waste Disposal Center. These experiences have importance as a first implementation for the national LILW disposal facility in the Republic of Korea. As for the progress, it relates to the area of selected disposal site, the disposal site characteristics, waste characteristics of the disposal facility, safety assessment, and licensing process. During these experiences, we also discuss the necessity for new organization and change for a radioactive waste management system. Further effort for the safe management of radioactive waste needs to be pursued.

• Bulletin of the Korean Chemical Society
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• 제24권9호
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• pp.1324-1328
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• 2003

The simultaneous determination of anions ($SO_4 ^{2-},\;Cl^-,\;and\;NO_3^-$) and cations ($Na^+,\;NH^{4+},\;K^+,\;Mg^{2+},\;and\;Ca^{2+}$) in natural water obtained by Nakdong River waters system in Korea were performed by ion-exclusion/cationexchange chromatography with conductimetric detection. The stationary phase was a polymethacrylate-based weakly acidic cation-exchange resin column in the $H^+$-form and a weak-acid eluent. When using only a 1.4 mM sulfosalicylic acid/6 mM 18-crown-6 ether as an eluent, good resolution of both anions and cations, minimum time required for the separation, and satisfactory detection sensitivity were obtained in a reasonable time. The method was successfully applied to the simultaneous determination of anions and cations in natural waters.

• Carbon letters
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• 제16권1호
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• pp.41-44
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• 2015

We report the preparation of sulfonated reduced graphene oxide (SRGO) by the sulfonation of graphene oxide followed by radiation-induced chemical reduction. Graphene oxide prepared by the well-known modified Hummer's method was sulfonated with the aryl diazonium salt of sulfanilic acid. Sulfonated graphene oxide (SGO) dispersed in ethanol was subsequently reduced by ${\gamma}$-ray irradiation at various absorbed doses to produce SRGO. The results of optical, chemical, and thermal analyses revealed that SRGO was successfully prepared by ${\gamma}$-ray irradiation-induced chemical reduction of the SGO suspension. Moreover, the electrical conductivity of SRGO was increased up to 2.94 S/cm with an increase of the absorbed dose.

• 벤처창업연구
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• 제2권1호
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• pp.1-14
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• 2007

본 연구에서는 창업보육센터 자체의 조직과 창업보육센터에 입주하여 기술개발과 경제활동에 힘쓰고 있는 입주업체의 조직과 구성원들의 운영 활동의 문제점을 살펴보고, 두 조직간의 상호관계를 도출하였다. 또한 나타난 제반 문제점들에 대한 해결방안 및 조직의 구성, 체계적인 관리방법 등을 통해 지역 창업보육센터의 자립 경영 방향을 제시하였다. 이를 구체적으로 살펴보기 위하여 창업보육센터 입주기업들을 유형별로 4가지 형태로 나누어 분류하였고, 실제 한 대학의 예를 들어 각 유형 별 기업의 특징과 장 단점 그리고 발전방안을 제시하였다.