• 한국응용과학기술학회지
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• 제27권3호
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• pp.353-360
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• 2010

This study was carried out to investigate the possibility of solid particles as a stabilizing agent instead of surfactant for preparing emulsions in the cosmetics. The type of emulsions stabilized by solid particles was dependent on wettability of the particles for water and oil. The optimal conditions of emulsions stabilized by solid particles were determined with ratio of water and oil phase, polarity of oils and amount of stabilizers. In the foundation appling the optimal condition of emulsions stabilized by solid particles without surfactant, the stable emulsion type foundation was successfully prepared. As a result, this work indicates that emulsions stabilized by solid particles can be applied to make-up cosmetics.

• 대한금속재료학회지
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• 제48권9호
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• pp.791-797
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• 2010

The creep crack growth rate (da/dt) of the Cr-Mo steels tested by pre-crack and the voltage (or resistance) variables were related into fracture parameter (Ct), crack growth coefficient (H), and an exponent (q) in the parts of Base, weld and HAZ. The fracture parameter (Ct) has various variables relating to the specimen and crack shape, applied stress, and creep strain curve. The H and q was inferred by OLS regression (ordinary least square method), and the H values were solved in statistics and probability assessment, which were attained fromPDF's distributions (probability density function). The HAZ part has the highest value of q by OLS regression and the widest distribution of H by PDF of WEIBULL, which means that the crack sensitivity of HAZ should be cautioned against the creep crack growth and failure.

• 한국기계가공학회지
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• 제18권8호
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• pp.98-103
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• 2019

A more accurate method of feature point extraction and matching for three-dimensional reconstruction using low-resolution images of crops is proposed herein. This method is important in basic computer vision. In addition to three-dimensional reconstruction from exact matching, map-making and camera location information such as simultaneous localization and mapping can be calculated. The results of this study suggest applicable methods for low-resolution images that produce accurate results. This is expected to contribute to a system that measures crop growth condition.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2019년도 학술발표회
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• pp.252-252
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• 2019

하상재료는 하천의 유사이송, 총유사량 산정, 장래 하상변동 모의, 하천의 조도, 하천 서식처와 같은 하천환경 분석 등에 다목적으로 활용된다. 그러나 그간 하상재료는 하천기본계획, 유사량조사, 유역조사, 하도변화 모니터링 사업 등에서 조사되어 왔으나, 자료가 체계적으로 관리되지 않아 활용성이 낮은 실정에 있다. 이에 본 연구에서는 하상재료의 활용성에 목적을 두고 한국수자원조사기술원에서 수행한 유사량조사, 유역조사, 하도변화 모니터링에서 생산된 자료를 수집하여 분석한 후 DB화하였다. 본 연구에서 DB화한 측선은 총 1,676개이며, 사업별로는 유사량조사 191개소(한강권역 40개소, 낙동강권역 78개소, 금강권역 27개소, 섬진강권역 14개소, 영산강권역 32개소), 전국유역조사 1,404개소(한강권역 470개소, 낙동강권역 454개소, 금강권역 324개소, 섬진강권역 60개소, 영산강권역 96개소), 하도변화 모니터링 81개소(한강권역 17개소, 낙동강권역 39개소, 금강권역 12개소, 영산강권역 13개소)로 구분된다. 본 연구에서는 이용자의 편의성을 고려해 shape 파일 형태로 작성하여 채취 위치, 입경분포, 입경가적곡선 등의 다양한 구성요소를 DB화하였다. 본 연구에서는 현재 하상재료를 정기적으로 DB화할 수 있는 시스템(Riverbed Material Management System; RMS)을 구축 중에 있으며, DB화 대상도 하천기본계획에서 조사한 하상재료까지 확대할 예정이다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.921-926
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• 2006

The present study has been conducted economic analysis through actual operation of EHP and GHP which are installed at the same building of an university Cost items, such as initial cost, annual energy cost and maintenance cost of each system are considered to analyze LCC and economical efficiency is compared. The initial cost is considered on the basis of actual costs, and annual energy cost is converted into the cost after measuring electricity and gas consumption a day. LCC applied present value method is used to assess economical efficiency of both them. Variables used to LCC analysis are electricity cost escalation rate, natural gas cost escalation rate, interest rate, and service lives and when each of them are 4%, 2%, 8%, and 20 years, results of analysis short that EHP(148,257,306 won) is 8.05%(12,981,990 won) more profitable than GHP(161,239,295 won).

• 반도체디스플레이기술학회지
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• 제9권2호
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• pp.49-54
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• 2010

We have successfully synthesized $CeO_2$ nanopowders by means of the hydrothermal method, in a low temperature range of $100-200^{\circ}C$. In order to investigate the structure and morphology of the nanopowders, scanning electron microscopy and X-ray diffraction have been employed. In addition, for exploring the optical properties, Raman spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy have been used. In the optimized condition, with the pH, velocity, and time of 4.5, 600 rpm, and 60 h, the $CeO_2$ nanopowders with a diameter ranging from 50 to 150 nm have been synthesized. The nanopowders exhibited the visible emission mainly in the blue region. With comparing the reaction time, it is revealed that the extinction of functional groups at 60 h contributed to the growth and homogenization of the $CeO_2$ powders. Since the overgrowth and agglomeration of nanopowders were found, we suggest that the cracking/growth process is more favorable mechanism than the dissolution/precipitation process.

• Nuclear Engineering and Technology
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• 제47권7호
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• pp.915-923
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• 2015

Pyroprocess technology has been considered as a fuel cycle option to solve the spent fuel accumulation problems in Korea. The Korea Atomic Energy Research Institute, Daejeon, Korea has been studying pyroprocess technology, and the conceptual design of an engineering-scale pyroprocess facility, called the Reference Engineering-scale Pyroprocess Facility, has been performed on the basis of a 10 ton heavy metal throughput per year. In this paper the concept of Reference Engineering-scale Pyroprocess Facility is introduced along with its safety requirements for the protection of facility workers, collocated workers, the off-site public, and the environment. For the identification of safety structures, systems, and components and/or administrative controls, the following activities were conducted: (1) identifying hazards associated with operations; (2) identifying potential events associated with these hazards; and (3) identifying the potential preventive and/or mitigative controls that reduce the risk associated with these accident events. This study will be used to perform a safety evaluation for accidents involving any of the hazards identified, and to establish safety design policies and propose a more definite safety design.

• Nuclear Engineering and Technology
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• 제46권1호
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• pp.63-72
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• 2014

Pyroprocess technology has been considered as a fuel cycle option to solve the spent fuel accumulation problems in Korea. The Korea Atomic Energy Research Institute has been studying pyroprocess technology, and the conceptual design of an engineering-scale pyroprocess facility, called the Advanced Fuel Cycle (AFC) facility, has been performed on the basis of a 10tHM throughput per year. In this paper, the concept of the AFC facility was introduced, and its safety evaluations were performed. For the safety evaluations, anticipated accident events were selected, and environmental safety analyses were conducted for the safety of the public and workers. In addition, basic radiation shielding safety analyses and criticality safety analyses were conducted. These preliminary safety studies will be used to specify the concept of safety systems for pyroprocess facilities, and to establish safety design policies and advance more definite safety designs.

• Archives of Pharmacal Research
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• 제22권2호
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• pp.179-183
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• 1999

3-Arylisoquinolin-1(2H)-ones (2) are possible bioisosteres of the $5-[4^{l}-(piperidinomethyl)phenyl]-2<$,3-dihydroimidazo[2,1-$\alpha$]isoquinoline (1) which is in clinical evaluation for the treatment of cancer. Structure-activity relationship studies of 3-arylisoquinolin-1(2H)-ones. (2) led to the synthesis of 3-arylquinolin-2(1H)-ones (3). A number of 3-phenyl substituted quinolin-2(1H)-ones were synthesized and tested for their in vitro antitumor activity against four different human tumor cell lines and 3-phenyl-N-benzyl-3,4-dihydroquinolin-2(1H)-one (12) showed the most potent activity.

• Korean Chemical Engineering Research
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• 제57권3호
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• pp.387-391
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• 2019

A highly porous Ni@MIL-101catalyst for urea oxidation was synthesized by anchoring Ni into a Cr-based metal-organic framework, MIL-101, particles. The morphology, structure, and composition of as synthesized Ni@MIL-101 catalysts were characterized by X-Ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electro-catalytic activity of the Ni@MIL-101catalysts towards urea oxidation was investigated using cyclic voltammetry. It was found that the structure of Ni@MIL-101 retained that of the parent MIL-101, featuring a high BET surface area of $916m^2g^{-1}$, and thus excellent electro-catalytic activity for urea oxidation. A $urea/H_2O_2$ fuel cell with Ni@MIL-101 as anode material exhibited an excellent performance with maximum power density of $8.7mWcm^{-2}$ with an open circuit voltage of 0.7 V. Thus, this work shows that the highly porous three-dimensional Ni@MIL-101 catalysts can be used for urea oxidation and as an efficient anode material for urea fuel cells.