• Archives of Pharmacal Research
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• 제25권5호
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• pp.675-680
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• 2002

In order to investigate the underlying mechanism of HCI in oesophagitis, the inflammatory response to HCI was observed in RBL-2H3 mast cells. Rat basophilic leukemia (RBL-2H3) cells were used to measure histamine release, arachidonic acid (AA) release, reactive oxygen species (ROS) and peroxynitrite generation induced by HCI. Exogenous HCl increased the level of histamine release and ROS generation in a dose dependent manner, whereas it decreased the spontaneous release of [$^3$H] M and the spontaneous production of peroxynitrite. Mepacrine (10 $\mu$M), oleyloxyethyl phosphorylcholine (10 $\mu$M) and bromoenol lactone (10 $\mu$M) did not affect both the level of histamine release and ROS generation induced by HCI. U73122 (1 $\mu$M), a specific phospholipase C (PLC) inhibitor did not have any influence on level of histamine release and ROS generation. Propranolol (200 $\mu$M), a phospholipase D (PLD) inhibitor, and neomycin (1 mM), a nonspecific PLC and PLD inhibitor, significantly inhibited both histamine release and ROS generation. Diphenyleneiodonium (10 $\mu$M), a NADPH oxidase inhibitor, and tiron (5 mM), an intracellular ROS scavenger significantly inhibited the HCI-induced histamine release and ROS generation. These findings suggest that the inflammatory responses to HCI is related to histamine release and ROS generation, and that the ROS generation by HCI may be involved in histamine release via the PLD pathway in RBL-2H3 cells.

• 한국CDE학회논문집
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• 제5권1호
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• pp.95-101
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• 2000

For last two decades numerous automatic mesh generation algorithms for various two dimensional objects have been introduced continuously and among them triangular mesh generation schemes have been majority because of efficiency and controllability. In our study, an existing triangular mesh generation algorithm developed by Lo is totally modified to more improve node distribution, element shape, and objects shape independency. ft is composed of node generation part and element generation part. In order to find a suitable node position within geometry, the suggested algorithm searches desirable positions of points within boundary and optimizes node position to generate comparatively well-shaped elements. More over, the suggested algorithm handles various complex two dimensional objects and its meshing speed shows superiority to those of the existing triangulation mesh generation algorithms. It is fully automated in a sense of constructing object boundary and hence can be directly used as an independent meshing software.

• 대한전자공학회논문지SD
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• 제41권7호
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• pp.63-70
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• 2004

본 논문에서는 PC 의 스토리지 인터페이스로 사용되는 병렬 ATA를 대체하게 될 새로운 표준인 직렬 ATA 의 링크 층과 물리 층을 설계하였다. 링크층에서는 CRC 생성 및 오류 감지, 스크램블링 회로, 8b/10b 복호화/부호화 회로 및 프리미티브 생성/검파 회로로 구성되었다. 물리 층은 직렬화/병렬화 회로와 전원 초기 인가시의 리셋 발생회로, OOB 신호 발생/검파 회로, 데이터로부터 클록을 복원하는 회로, 스？치 회로 및 임피이던스 조정 회로와 콤마 발생/감지 회로로 설계하였나. 또한 불리 층과 링크층의 동작을 확인하기 위한 테스트 제어 블록과 BIST(Built In Self Test) 블록을 설계하였다. UMC 사의 0.18㎛ 표준 CMOS 공정을 이용하여, 칩으로 제작 후 특성을 검증하였다. 링크 층에서 요구하는 모든 기능 및 특성은 사양을 만족하였고, 물리 층의 출력 전압 및 드라이버 출력 지터, OOB 신호등의 특성도 만족하였다. 데이터 전송 율은 1.5Gbps 속도의 사양목표치에 비해서, 실제 측정된 데이터 전송 속도는 1.28Gbps로 측정되었다. 회로 시뮬레이션에 의한 확인 결과, 레이아웃에서의 배선에 대한 기생 성분의 영향에 의한 것으로 분석되었다.

• 한국수소및신에너지학회논문집
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• 제24권1호
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• pp.1-11
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• 2013

Additives such as glycerol, methanol, acetone, and ethanol were used to prevent $NaBO_2$ from precipitation, and their effects on hydrogen generation properties of $NaBH_4$ hydrolysis were investigated. When the concentration of additives was 5 wt%, the additives such as methanol, acetone, and ethanol could not prevent $NaBO_2$ precipitation. Although glycerol prevented $NaBO_2$ precipitation, conversion efficiency decreased to 78.0% due to its viscosity. Based on test results, hydrogen generation tests were also performed at various concentration of glycerol and methanol to investigate the concentration effects on hydrogen generation properties. As the concentration of glycerol increased from 1 wt% to 3 wt%, conversion efficiency increased owing to additive effect. When its concentration increased to 5 wt%, conversion efficiency decreased due to its viscosity. As the concentration of methanol increased from 5 wt% to 10 wt%, conversion efficiency increased owing to additive effect. When its concentration increased to 15 wt%, conversion efficiency decreased due to $NaB(OCH_3)_4$ precipitate. Although conversion efficiency decreased about 1% when 3 wt% glycerol was added, $NaBO_2$ precipitation was prevented. Consequently, addition of 3 wt% glycerol to $NaBH_4$ solution improves stability of hydrogen generation system.

• 한국응용곤충학회지
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• 제19권4호
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• pp.243-248
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• 1980

가, 숯검은밤나방은 1회 발생으로 9월하순이 최성기였고 짐거세미나방 및 거세미나방은 년 $2\~3$회 발생으로 1화 6월중순, 2화기 8월중순, 3화기 9월하순에 최성기를 보였다. 나, 거세미나방류의 각태별 기간은 숯검은나방은 난기간 6.3일 유충기간 327.1, 용기간 25.1, 성충기간 6.5로 유충기간이 길었고 검거세미나방은 난기간 4.2일, 유충기간 29.6일, 용기간 17.5일, 성충기간 5.2일 이었고 거세미나방은 난기간 5.6일, 유충기간 38.2일, 용기간 27.3일, 성충기간 5.7일이었다. 다, 거세미나방류는 배추의 잎이 축 늘어진 잎 뒷면에 산란하였다. 라. 거세미나방 유충의 토중 잠토 시기는 3령이후였다. 마, 거세미나방류의 천적으로는 고치별 1종과 맵시벌 2종이 발견되었다. 바, 거세미나방류의 방제약제로는 모캡 및 보라톤이 효과적이었으나 보라톤은 작물체에 직접 닿으면 약해가 유발되므로 세심한 주의를 요한다.

• 대한토목학회논문집
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• 제43권2호
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• pp.249-258
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• 2023

태양광발전은 현재 국내 신재생에너지 중 발전량과 설비용량 비중이 가장 크다. 수상태양광은 국내의 육상태양광 발전시설의 여러 가지 단점을 보완한 방식이다. 본 연구는 군산 새만금에 위치한 18.7 MW 시설용량의 수상태양광발전소를 대상으로 발전량을 분석하고자 한다. 기후의 영 향을 많이 받는 태양광발전사업의 특성으로 타당성을 확인하고자 관련 연구자들은 태양광 발전량 예측에 많은 기법들을 적용하였다. 일반적으로 발전량 예측에 필요한 변수들은 사업대상 지역의 경사면 일사량, 발전효율, 패널 설치 면적 등이다. 본 연구는 기상청 과거 10년간의 월 일사량 데이터를 활용하여 태양광 발전량을 분석하였다. 발전량을 예측하기 위해서 몬테카를로 시뮬레이션 기법을 적용하였으며, 태양광 패널의 발전효율과 일사량을 시뮬레이션의 변수들로 사용하였다. 새만금 태양광의 경우, 가장 태양광 발전량이 많은 달은 5월이며, 가장 적은 달은 12월로 예측되었으며, 발전량은 월평균 2.1 GWh이고, 최소 월 발전량은 0.3 GWh, 최대는 5.0 GWh로 분석되었다.

• 한국육종학회지
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• 제41권2호
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• pp.92-100
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• 2009

To investigate the mutagenecity of sodium azide (SA) and to select mutants having various agronomic characteristics in rice (Oryza sativa L. ssp. japonica), dry seeds of rice variety 'Suweon 472' were treated with 0, 0.5, 1.0, 2.0, and 4.0 mM SA solutions prepared in 0.1 M phosphate buffer (pH 3.0). Germination rate, seedling height and sterility were investigated in $M_1$ generation and chlorophyll mutations were observed in $M_3$ generation. Germination rate and seedling height decreased as the increase of SA concentration in $M_1$ generation, the maximum seed sterility (40.8%) was found at 4.0 mM SA concentration. Chlorophyll mutants were occurred in $M_3$ generation and the frequency calculated on a line basis was 13.5% at the same treatment. Many kinds of mutations for morphological and agronomic characters were observed and mutations with short culm and glabrous leaf were frequently found in $M_3$ generation. Interestingly, five mutant lines resistant to blast or bacterial blight (BB) were selected and evaluated with several isolates in $M_3$ generation although Suweon 472 has been known to be susceptible to blast and BB. These mutants showed all resistance to seven isolates of blast and a total of 76 lines among 2,567 lines evaluated showed resistant to race K1 of bacterial blight. Two mutant lines (440172 and 41272) showed different reaction to BB isolates from the other resistant mutants. A few kinds of endosperm mutants were also identified and most of them were waxy mutants.

• Current Photovoltaic Research
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• 제5권1호
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• pp.33-37
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• 2017

Today, photovoltaic power generation mostly uses Si crystalline solar cell modules. The most vulnerable part of the Si solar cell module is that the power generation decreases due to the temperature rise. But, it is widely used because of low installation cost. In the solar market, where Si crystalline solar cell modules are widely used. The CPV (Concentrated Photovoltaic) module appeared in the solar market. The CPV module reduces the manufacturing cost of the solar cell by using non-Si in the solar cell. Also, there is an advantage that a rise in temperature does not cause a drop in power generation. But this requires high technology to install and has a disadvantage that the initial installation cost is expensive compared to normal Si solar cell module. So that we built a testbed to see these characteristics. The testbed was used to measure the amount of power generation in a long-term outdoor environment and compared with the general Si solar cell module.

• International Journal of Advanced Culture Technology
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• 제4권1호
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• pp.1-9
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• 2016

The demand for energy in Thailand has been continually increasing as the economic and social country grows. Approximately 60% of Thailand's primary energy is imported, mostly petroleum products. In 2008 Thailand's total energy consumption was 80,971 ktoe and the net price of energy imported was up to 1,161 billion Baht which is equivalent to 12.8% of GDP at the current price. The energy consumption or energy demand has been growing at an annual compounded growth rate of 6.42% and the peak electric power demand and electricity consumption was recorded at 22,568 MW and 148,264 GWh and grew at a rate of 7.0% and 7.5% per annum during the period from 1989 to 2008. The gross agriculture production in 2008 was recorded at 135.4 Mt which represents agriculture residue for energy at 65.73 Mt, which is equivalent to energy potential of about 561.64 PJ or 13,292 ktoe an increase in average of 5.59% and 5.44% per year respectively. The agricultural residues can converted to 15,600 GWh/year or 1,780 MW of power capacity. So, if government sector plan to install small biomass gasification for electricity generation 200 kW for Community. The residue agricultural is available for 8,900 plants nationwide. The small biomass power generation for electricity generation not only to reduce the energy imports, it also makes the job and income for people in rural areas as well. This paper's aim is to report the energy situation in Thailand and has studied 5 main agricultural products with high residue energy potential namely sugarcane, paddy, oil palm, cassava, and maize appropriate for small electricity production. These agricultural products can be found planted in many rural areas throughout Thailand. Finally, discuss the situation, methods and policies which the government uses to promote small private power producers supplying electricity into the grid.

• International Journal of Aerospace System Engineering
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• 제3권1호
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• pp.5-9
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• 2016

This paper briefly introduces efforts into space debris modeling towards a better understanding of space debris environment. Space debris modeling mainly consists of debris generation and orbit propagation. Debris generation can characterize and predict physical properties of fragments originating from explosions or collisions. Orbit propagation can characterize, track, and predict the behavior of individual or groups of space objects. Therefore, space debris modeling can build evolutionary models as essential tools to predict the stability of the future space debris populations. Space debris modeling is also useful and effective to improve the efficiency of measurements to be aware of the present environment.