• Weed & Turfgrass Science
• /
• 제7권1호
• /
• pp.62-71
• /
• 2018

본 연구는 부식산 함유 액비(LFH)의 시비에 따른 크리핑 벤트그래스의 생육과 품질의 변화를 확인하기 위해 잔디의 가시적 품질, 엽록소 함량, 예지물량, T/R ratio, 양분 함량 및 흡수량을 조사하였다. 처리구는 대조구(CF), LFH 1,000배 처리구(HF-1), LFH 500배 처리구(HF-2) 및 LFH 250배 처리구(HF-3)로 구분되었다. LFH 처리 전후에 토양화학성은 차이를 나타내지 않았다. LFH처리구와 대조구를 비교하였을 때, 가시적 품질과 뿌리 생육량은 LFH처리구에서 증가하였고, 엽록소 함량, 잔디 예지물, 질소 흡수량은 HF-2처리구와 HF-3처리구에서 각각 11.2-11.8%, 15.3-30.8%, 22-42%씩 증가하였다. LFH처리량에 따라 가시적 품질, 엽록소 함량, 잔디 예지물 및 양분 흡수량은 정의 상관성을 나타내었다. 이 결과들을 종합해 볼 때, 크리핑 벤트그래스에서 부식산 함유 액비의 시비는 잔디의 잎 조직 중 잔디지하부의 생육이 증가하여 양분 흡수를 개선함으로써 잔디품질과 생육이 증가하는 것을 확인 할 수 있었다.

• Bulletin of the Korean Chemical Society
• /
• 제11권6호
• /
• pp.511-515
• /
• 1990

Ab initio calculations with MP3 and CISD method were performed for the FCO and $FCO^+$. The equilibrium geometry of FCO shows the reasonable agreement with experimental values. $FCO^+$ has a linear geometry with $R_{CF}=1.213\;and\;R_{CO}=1.118{\AA}$. The quadratic force constants of $FCO^+$ are 23.21 md ${\AA}^{-1}$ for CO stretch and 12.38 md ${\AA}^{-1}$ for CF stretch. The cubic force constants and the other molecular constants are also calculated.

• 한국건설순환자원학회논문집
• /
• 제11권1호
• /
• pp.48-54
• /
• 2023

본 연구에서는 금속성분을 다량 함유한 전기로산화슬래그(EOS)를 골재로 활용한 콘크리트에 도전성이 높은 카본계 재료를 혼입하여 현장적용이 가능한 EMP 차폐 콘크리트의 최적배합을 도출하고자 기초적인 물성과 두께별 EMP 차폐성능을 평가하였다. 평가결과 슬럼프는 카본섬유(CF)의 혼입량이 증가할수록 저하, 밀드카본(MCF) 혼입시 증가하는 것을 확인할 수 있었다. 압축강도는 EOS가 NA에 비해 강도를 증진시키는 것을 확인할 수 있었으며, CF 및 MCF 혼입시 강도가 저하되는 것을 확인할 수 있었다. EMP 차폐 측정결과 두께가 증가할수록 차폐율이 증가하였으며, 도전성 재료의 첨가량보다 도전성 재료의 종류 및 시험체의 두께가 차폐율 증가에 영향력이 더 큰 것을 확인할 수 있었다. 종합적으로 비교평가를 진행한 결과 EMP 차폐 콘크리트 배합으로 EOS CF 0.2가 적합한 것으로 사료된다.

• 반도체디스플레이기술학회지
• /
• 제11권2호
• /
• pp.85-91
• /
• 2012

In this paper, the large data processing and suitable FAT32 file system for industrial system using a PLC and CF memory was implemented. Most of PLC can't save the large data in user data memory. So it's required to the external devices of CF memory or NAND flash memory. The CF memory is used in order to save the large data of PLC system. The file system using the CF memory is NTFS, FAT, and FAT32 system to configure in various ways. Typically, the file system which is widely used in industrial data storage has been implemented as modified FAT32. The conventional FAT 32 file system was not possible for multiple writing and high speed data accessing. The proposed file system was implemented by the large data processing module can be handled that the files are copied at the 40 bytes for 1msec speed logging and creating 8 files at the same time. In a sudden power failure, high reliability was obtained that the problem was solved using a power fail monitor and the non-volatile random-access memory (NVSRAM). The implemented large data processing system was applied the modified file system as FAT32 and the good performance and high reliability was showed.

• Bulletin of the Korean Chemical Society
• /
• 제34권11호
• /
• pp.3274-3278
• /
• 2013

$CF_2Cl{\cdots}Cl$, an elusive photo-isomer of $CF_2Cl_2$, has been observed in matrix IR spectra from the precursors exposed to radiation from laser ablation of transition-metals. Other plausible products, $CFCl_2{\cdots}F$ and $FClC{\cdots}F-Cl$ are not detected due to their considerably higher energies. Parallel to its previously reported analogues, the C-X bonds are considerably stronger than those of the reactant, and particularly the Cl atom that is weakly bound to the residual Cl atom forms an unusually strong carbon-halogen bond. NBO analysis reveals that the C-Cl bond is a true double bond, and the weak $Cl{\cdots}Cl$ bond is largely ionic, $F_2C=Cl^{\delta+}{\cdots}Cl^{\delta-}$. IRC computation reproduces smooth inter-conversion between the reactant and product, and the transition state is energetically close to the product, consistent with its prompt disappearance in the early stage of photolysis.

• Bulletin of the Korean Chemical Society
• /
• 제17권11호
• /
• pp.1004-1009
• /
• 1996

The interactions between a rod-coil liquid crystalline oligomer, ethyl 4-[4'-oxy-4-biphenylcarbonyloxy]-4'-biphenylcarboxylate with poly(ethylene oxide) (DP=12) (12-4) and LiCF3SO3 have been characterized by using Raman spectroscopy. Band assignments were made comparing the spectrum of 12-4 with those of the poly(ethylene glycol) monomethyl ether(PEGME) (Mw=550) and the ethyl-4'-hydroxybiphenyl-4-carboxylate (EHBPC), which are the coil and mesogen analogues, respectively. Analyzing characteristic bands of the 12-4-salt complex, we have found that the bands belonging to the coil and mesogenic units are changed in both intensities and frequencies. The spectral changes were interpreted from the viewpoint of the complexation between 12-4 and the Li+ ion. However, the possibility that the spectral changes in the mesogenic unit are not due to the complexation with the Li+ ion, but due to the conformational changes by the intercalation of nondissociated LiCF3SO3, is not ruled out.

• 한국초전도ㆍ저온공학회논문지
• /
• 제11권2호
• /
• pp.37-40
• /
• 2009

A mixed working fluid has a potential to widen the operation temperature range of the thermosiphon. In this study, the thermosiphon using $N_2\;and\;CF_4$ mixture as the working fluid is fabricated and tested to verify its transient thermo hydraulic characteristic. A transparent pyrex glass tube was used for the thermosiphon itself and the vacuum chamber was also fabricated by glass to visualize the internal state of thermo siphon. Onset of condensation temperature was related to the partial pressure of $CF_4$. Two solidifications were observed and condensate temperature range of mixed working fluid was from 160K to 70.7K with $N_2$ 25% composition.

• 한국전기전자재료학회논문지
• /
• 제15권11호
• /
• pp.933-938
• /
• 2002

(Ba,Sr)TiO$_{4}$ (BST) thin films on Pt/Ti/SiO$_{2}$/Si substrates were deposited by a sol-gel method and the etch characteristics of BST thin films have been investigated as a function of gas mixing ratio. The maximum etch rate of the BST films was 440 $AA$/min under such conditions as: CF$_{4}$(CF$_{4}$＋Ar) of 0.2, RF-power of 700 W, DC-bias voltage of -200 V, pressure of 15 mTorr and substrate temperature of 30 $^{circ}C$. The selectivities of BST to Pt, SiO$_{2}$ and PR were 0.38, 0.25 and 0.09, respectively. In the XPS (X-ray photoelectron spectroscopy) analysis, Barium (Ba) and Strontium (Sr) component in BST thin films formed low volatile compounds such as BaFx, SrFx, which are forms by the chemical reaction with F atoms and is removed by Ar ion bombardment. Titanium (Ti) is removed by chemical reaction such as TiF with ease. The result of secondary ion mass spectrometry (SIMS) analysis confirmed the existence of the BaFx, SrFK, TiFx.

• 한국식품위생안전성학회지
• /
• 제25권1호
• /
• pp.10-15
• /
• 2010

2009년 4-7월 대형 수산물 도매 시장에서 구입한 조미 건어포류 210건 (오징어포류 157건, 쥐치포 23건, 명태포류 20건 등) 을 조사한 결과, 균종별로는, 대장균군 13.3%(28/210), 바실러스균 15.2%(32/210), 포도상구균 33.8%(71/210), 리스테리아균 5.2%(11/210), 그리고 장구균 4.7%(10/210) 등으로 각각 분리되었다. 대장균군의 경우 Escherichia coli 등 총 28주가 분리 되었고, 건오징어에서 22주로 가장 많았으며, 포도상구균의 경우 Staphylococcus xlosus 등 총 71주가 분리되었고, 건오징어에서 51주가 분리되어 가장 많았으며, 바실러스균의 경우, Bacillus cereus 19주 등 총 32주였고, 건오징어에서 21주로 가장 많았다. 한편, 리스테리아균은 Listeria grayi가 8주, 장구균의 경우는 Aerococcus viridons가 9주로 각각 분리되었다. 16종류의 항생제들에 대해 디스크 확산 법에 의한 항생제 감수성 검사를 실시한 결과, 9주의 E. coli에 대한 다제 내성 양상들은 NOR+LVX+CIP+SAM+VA+S+TE+CF, SAM+C+VA, VA+S+TE, 그리고 VA+S 등으로 나타났고, 21주의 Bacillus cereus에 대한 다제 내성 양상들은 AMC+SAM+CF, SAM+CF, 그리고 VA+CF 등으로 각각 나타났으며 이 가운데 AMC+SAM+CF가 9주로 가장 많았다. 본 연구를 통해 시판 조미 건어포류에서 다제 내성 균주들이 꾸준히 증가하고 그 양상이 복잡해짐을 알 수 있었고, 이와 같은 항생제 다제 내성 균주들의 증가는 최근 수산 가두리양식장에서의 항생제 남용에 대한 가이드라인 설정과 이에 대한 국가적인 관리가 요구됨을 알 수 있다.

• 보건세계
• /
• 제59권6호
• /
• pp.10-11
• /
• 2012