• Mass Spectrometry Letters
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• 제5권1호
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• pp.16-23
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• 2014

Liquid chromatography based mass spectrometry (LC-MS) is a key technology for analyzing highly complex and dynamic proteome samples. With highly accurate and sensitive LC-MS analysis of complex proteome samples, efficient data processing is another critical issue to obtain more information from LC-MS data. A typical proteomic data processing starts with protein database search engine which assigns peptide sequences to MS/MS spectra and finds proteins. Although several search engines, such as SEQUEST and MASCOT, have been widely used, there is no unique standard way to interpret MS/MS spectra of peptides. Each search engine has pros and cons depending on types of mass spectrometers and physicochemical properties of peptides. In this study, we describe a novel data process pipeline which identifies more peptides and proteins by correcting precursor ion mass numbers and unifying multi search engines results. The pipeline utilizes two open-source software, iPE-MMR for mass number correction, and iProphet to combine several search results. The integrated pipeline identified 25% more proteins in mouse epididymal adipose tissue compared with the conventional method. Also the pipeline was validated using control and colitis induced colon tissue. The results of the present study shows that the integrated pipeline can efficiently identify increased number of proteins compared to the conventional method which can be a breakthrough in identification of a potential biomarker candidate.

• 한국의류학회지
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• 제35권3호
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• pp.359-370
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• 2011

This study analyzes the textiles design of natural indigo dyed products in Korea and Japan. In this study, a total of 556 Korean natural indigo dyed products, and 2,730 Japanese natural indigo dyed products were used for analysis. The subjects of this study were 556 natural indigo dyed products and 2,730 Japanese natural indigo dyed products selling natural indigo dyed products which were found using search engine keywords of natural indigo dyeing and natural dyeing. Research and analysis was treated regarding the products, items, patterns, and the representation techniques of the patterns. The results of this study are as follows. In the pattern used for natural indigo dyed products, 71.4% of Korean products have no pattern, but 77.1% of Japanese products have patterns. On the representation techniques of the patterns, Korean products used tie-dyeing and a dip patterned fabric. While in the Japanese products, the most frequent patterning techniques were paraffin dye, followed by tie-dyeing, yarn-dyed and weaving, screen printing, and yarn-dyed and knitting. Regarding the kinds of patterns for natural indigo dyed products, only 8 kinds of patterns were used in Korean products; however, over 50 kinds of various patterns were used in Japanese products. Most patterns in the Korean products were ion patterns made by tie-dyeing. While in the Japanese products, the most frequent patterns were stripe patterns, followed by flower, dot, and ion patterns. Based on these research results, the problems of the textile design of Korean natural indigo dyed products were that most of the products have no pattern, and even though there were patterns, they lacked variations between the products. While in the case of Japan, they used the traditional and modem patterns of various textile representation techniques.

• 한국자기학회지
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• 제4권4호
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• pp.326-334
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• 1994

친수성-고점도 자성유체를 Nd-영구자석과 병용하여 기름밀봉 장치로의 개발을 목표로 실험 검토하였다. etylene glycol 액상중에 $Fe_{3}O_{4}$를 분산시킨 자성유체는 매질의 비등점이 다른 액상보다 높고 점성이 높아서 기름밀봉 성능을 향상시킬 수 있을 뿐만 아니라 본 장치의 부품중 대부분 을 이루고 있는 철강재를 부식시키지 않았다. 본 자성유체중 $Fe_{3}O_{4}$ 농도가 증가할수록 점도 와 자성율이 증가하여 기름밀봉 성능을 향상시킬 수 있었다. 본 장치는 대기압하에서 기름밀봉 성능이 매우 우수하였다.

• Corrosion Science and Technology
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• 제22권3호
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• pp.201-213
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• 2023

Corrosion management of an aircraft and its engine relies on rinsing and cleaning using tap water. Few studies have reported effects of tap water species on corrosion behaviors of structural materials. In this study, a series of experiments were conducted based on the design of experiment. Solutions with different levels of chloride and sulfate ions were prepared using a full factorial design. Two structural materials (aluminum alloy and steel) were used for an alternate immersion test. Weight loss was then measured. In addition, a silver specimen was utilized as a sensor for chloride deposition measurement. The silver specimen was examined using the electrochemical reduction method, XPS, and SEM-EDS. Surface analysis revealed that levels of chloride and sulfate ions were sufficient for the formation of silver chloride and silver surface. Statistical analysis of weight loss and chloride deposition rate showed significant differences in measured values. Concentration of chloride ions greatly affected corrosion behaviors of structural materials. Sulfate ion hindered the adsorption reaction. These results emphasize the importance of controlling ion concentration of tap water used for cleaning and rinsing an aircraft.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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• pp.545-548
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• 2005

There is a close relation between the heat generation in the fuel cell stack and the fuel cell performance. In PEM fuel Gell vehicles, the stack coolant temperature is about $65^{\circ}C$, which is far lower than that for general automobile engine. Therefore, it is hard to release heat generated in the stack by using a radiator of limited size because of the reduced temperature difference between the coolant and the ambient air. In this study, indirect stack cooling system using $CO_2$ heat pump was designed and its stack cooling performance in releasing heat to the ambient was investigated. This work focuses on a series of processes that grasp the relation among the fuel cell power, the radiator capacity and the stack temperature. The purpose of this work is to find out a way to properly release sufficient amount of heat through the finite sized radiator, so that the stack power general ion can not be deteriorated due to the stack temperature increase. The optimization between the compressor power consumption and the fuel cel1 output power can be carried out to maximize the performance of fuel cell system.

• 공업화학
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• 제7권4호
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• pp.661-669
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• 1996

NaY 제올라이트에 Pt/Rh비를 달리하여 이온교환법으로 제조한 Pt-Rh촉매의 특성을$^{129}Xe$-NMR과 EXAFS 방법으로 특성조사를 하였다. $^{129}Xe$-NMR과 EXAFS 자료는 PtRh 이원금속 클러스터의 표면으로 Rh 원자들이 모이는 것으로 나타났다. 모사 자동차 배기가스를 사용하여 희박, 과농 및 양론조건에서 CO, HC 및 $NO_x$ 전환율을 측정하였으며, Pt-Rh/NaY(Pt/Rh=1) 이원금속 촉매가 다른 촉매들보다 세가지 오염물질에 대한 반응활성이 높게 나타남을 알 수 있었다.

• 한국분무공학회지
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• 제3권1호
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• pp.19-26
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• 1998

The effect of mixture component makes a nelay time and a long total combustion period $\tau_{p\;max}$. The flame propagation delay $\tau_{df}$ was determined by the record of current ion. The pressure release delay $\tau_{dp}$ and $\tau_{p\;max}$ were determined by the indicated pressure diagram in constant volume of the combustion chamber. The results are as follows: 1) The ignition delay $\tau_t$ time takes the minimum value around $\Phi=1.15$. 2) $\tau_{df}$ and $\tau_t$ time increased according to the increases of the concentrated dilution gases, because the adiabatic flame temperature decreased due to the increases of the heat capacity. But dilution gases have little effect on flame nucleus formation delay 3) The relation between $\tau_t$ time and reciprocal laminar burning velocity is almost linear. 4) The increase of the propagation length is accompanied with increased ratio of the $\tau_{df},\;\tau_{dp},\;\tau_{t},\;\tau_{p\;max}$.

• 디지털산업정보학회논문지
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• 제5권4호
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• pp.11-17
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• 2009

Polarography is a subclass of voltammetry where the working electrode is a dropping mercury electrode. More, I developed the experiment for raising up mercury electrode. In Voltammetry, information about an analyte is obtained by measuring the current as the potential is varied at oxidation-reduction reaction. A plot of current vs. potential in a polarography experiment shows the current oscillations correspoding to the drops of Hg falling from the capillary. The drops growth causes capacitive and faradic current. These changing current effects combined with experiments where the potential is continuously changed can result in noisy traces. The raising up type improved upon the method of dropping in hardware. In reduction of the noise, moving average smoothing method have been used. But the other procedure is introduced based on Fourier transformation. So FFT and IFFT engine was implemented and installed in my experiment. However, after experimentation, peak height as the measuring parameter gave a good linear relationship to concentration. The resolution of potential peaks of various kinds, using Zn and Cu as the example, was improved using the smoothing method.

• Journal of Advanced Marine Engineering and Technology
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• 제40권1호
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• pp.28-33
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• 2016

배터리는 휴대폰, 전기자동차, 무인잠수정 등과 같은 분야에서는 주 동력원으로 사용되고, 일반 자동차에서는 시동기 또는 램프구동용으로 사용되며, 일반 선박에서는 비상전원으로 사용되고 있다. 2차 전지로는 납축전지와 리튬이온 배터리를 많이 사용하고 있으며, 납축전지는 가격이 비교적 저렴하고 안전하다. 리튬이온전지는 에너지 밀도가 높고 출력이 우수하며 수명이 긴 장점이 있으나 공기 중의 수분과 반응하여 폭발의 위험성을 가지고 있다. 그러나 최근에는 방수, 방염, 방진 기술의 발달에 힘입어 리튬배터리의 사용이 증가하고 있고, 특히 하이브리드 선박 및 전기추진 선박 등의 주동력원으로 사용될 만큼 그 사용범위가 점점 넓어지고 있으므로 좀 더 엄격한 배터리의 관리가 필요하다. 하이브리드 선박에서는 500kWh 이상의 대용량 동력원을 만들기 위하여 셀(Cell) 단위로 이루어진 수십 개의 리튬배터리가 들어 있는 팩들로 접속이 된 전원을 사용한다. 따라서 배터리 점검에 필요한 검출 전압, 전류 및 온도 데이터들을 관리용 서버로 보내 주는 유선 점검 및 감시시스템을 구현하는 데에는 많은 전선과 통신 모듈이 필요하다. 본 논문에서는 직렬통신 모듈보다 가격이 저렴하고 전선을 사용하지 않는 저 전력 블루투스(Bluetooth low energy, BLE) 무선통신 모듈과 전력선 모뎀을 사용하여 하이브리드 선박용 리튬배터리 저가형 점검 및 감시시스템을 구현하고자 한다. 배터리의 점검요소에는 잔존용량(State of charge, SOC)과 잔존수명(State of health, SOH)이 있으며, 제안한 시스템은 이들을 규칙적으로 점검하여 배터리의 수명 예측과 예방 정비를 할 수 있기 때문에 안전사고를 방지할 수 있을 것으로 전망된다.

• KEPCO Journal on Electric Power and Energy
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• 제6권2호
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• pp.173-179
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• 2020

전기자동차의 보급이 확대됨에 따라, 소비자의 고속충전에 요구가 높아지고 있으나 관련 연구는 미흡한 실정이다. 본 연구에서는 LiNi_0.5Co_0.2Mn_0.3O₂/Graphite 18650 실린더형 리튬이온전지를 이용하여, 정전류와 정출력 충전방식에 따른 전지 열화현상을 비교한다. 정전류모드의 충전속도를 1C, 2C, 3C, 4C로 설정하고, 각 충전속도에서의 에너지를 기반으로 정출력값을 산정하였다. 따라서, 동일 충전 에너지를 기반하여, 두 충전방식에 따른 전지 열화를 분석한 결과, 3C의 높은 율속에서 정출력 충전방식이 전지의 열화를 늦출 수 있음이 전압곡선, 용량유지율, 직류저항값으로 확인되었다. 그러나, 충전속도를 4C 이상 높이면, 충전방식보다 전지간 편차가 열화 거동을 지배하였다.