• Bulletin of the Korean Chemical Society
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• 제13권6호
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• pp.650-654
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• 1992

Absorption and fluorescence spectra are reported for four different 1 : 3 $Dy^{3+}$ : ligand systems in aqueous solution under mild alkaline pH conditions. The ligands included in this study are oxidiacetate, dipicolinate, iminodiacetate and methyliminodiacetate. The oscillator strengths for the 4f→4f multiplet-to-multiplet transitions are empirically determined from the absorption spectra and the intensity parameters ${\Omega}_{\lambda}$}(${\lambda}$ = 2, 4, 6) for the systems are also obtained by applying the Judd-Ofelt theorem to the observed oscillator strengths. The values of the intensity parameters for the systems are compared and discussed in terms of ligand structural properties to investigate how the intensity parameters can response to the minor changes in the ligand environment. In addition, the relative oscillator strengths for fluorescence are evaluated and compared to the results obtained from absorption spectra.

• Bulletin of the Korean Chemical Society
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• 제16권3호
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• pp.232-237
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• 1995

The absorption spectra of holmium nitrate and erbium nitrate and the difference absorption spectra of their complexes with crown ethers were measured in acetonitrile. The crown ethers used in this study are 12-crown-4 and 15-crown-5. The oscillator strengths for the 4f→4f multiplet-to-multiplet transitions are empirically determined from the absorption spectra in combination with the difference spectra. The intensity parameters Ωλ (λ=2, 4, 6) for the systems are also evaluated by applying the Judd-Ofelt theorem to the observed oscillator strengths. The values of the intensity parameters are compared and discussed to investigate the sensitivity of the intensity parameters to the ligand environment.

• 지구물리와물리탐사
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• 제13권1호
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• pp.109-117
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• 2010

소니 플레이스테이션3 (PS3) 비디오 게임 콘솔을 이용하여 대용량자료에 고성능 계산을 적용시키기 위하여 개인용컴퓨터 (PC) 의 윈도우 시스템과 PS3로 구성된 하이브리드 시스템을 제작하였다. 이 시스템의 성능을 검증하기 위해 파형모양의 유사도를 이용하여 미세지진의 멀티플렛을 알아내는 실시간 멀티플렛 식별자 (RTMI)를 수행하여보았다. RTMI의 핵심 알고리즘인 상호상관 계산은 PS3 플랫폼에 최적화 되었고 자료의 압출력을 포함하는 다른 계산들은 PC 상에서 수행되었다. 이 경우에 알고리즘의 핵심 부분이 원래의 경우보다 50 배 이상 빨리 수행되어 결과적으로 개발된 시스템은 과거 400개의 신호밖에 처리하지 못하던 것을 총 2100개까지의 미소진통 신호등을 처리 할 수 있게 하였다. 이 결과는 자료전송시간이 계산시간에 비해 무시할 수 있는 한 PS3를 이용한 대용량 자료의 고성능 계산이 가능하다는 것을 잘 보여주고 있다.

• 천문학논총
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• 제10권1호
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• pp.127-134
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• 1995

Recent discovery of an Io-related feature in Jupiter's auroral regions prompted us to search for an or multiplet at $1304{\AA}$ in IUE aurora spectra. In three independent IUE spectra taken on January 18, 1981, we found an emission structure at $1304{\AA}$, with a signal-to-noise of about three. If the structure is due to the OI emission, then it is a direct evidence of oxygen ion precipitation, which may originate from Io and Io torus. The emission rates of the $H_2$ band systems and the or multiplet are about 50 kR and 150 R, respectively. We have constructed high resolution model spectra with the estimated emission rates of $H_2$, OI and SI for the Goddard High Resolution Spectrograph (GHRS) onboard the Hubble Space Telescope. The model spectra clearly show the or and SI mulitplets separated from crowded $H_2$ Lyman and Werner band lines, and therefore it is promising to detect the OI and SI multiplets with the GHRS. Given the possibility that the lo-related feature may be caused by ion precipitations from the Io flux tube, it is likely that the OI emission may be detected in the footprint area of the IO flux tube.

• Macromolecular Research
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• 제10권6호
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• pp.304-310
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• 2002

In a recent study by the same authors using a DMTA (Dynamic Mechanical Thermal Analyzer), it was found that the 4-aminobenzoic arid (ABA) molecules acted as either a neutralizing agent, or a plasticizer, or a filler, depending on the order of mixing of poly(styrene-co-styrenesulfonic acid) (PSSA), ABA, and NaOH. Subsequent to that study, we here pursued the same topic, i.e., the effect of the addition of CsOH (instead of NaOH) and ABA on the morphology of PSSA, but this time, by using a small-angle X-ray scattering (SAXS) technique. In line with the previous results, the present study with the SAXS technique verified that the order of mixing has a significant effect on the morphology of ionomers. In addition, with the SAXS data and the density values of the ionomers, we attempted to calculate both the number of sulfonate ionic groups per multiplet and the size of the multiplet of the ionomer.

• Bulletin of the Korean Chemical Society
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• 제13권1호
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• pp.54-59
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• 1992

Spectroscopic measurements and theoretical calculations are performed for the four 1 : 3 Sm(III) : ligand solutions. The ligands included in this study are oxidiacetate, iminodiacetate, methyliminodiacetate and dipicolinate. The oscillator strengths for the $4f{\to}4f$ multiplet-to-multiplet transitions are empirically determined from the absorption spectra. The intensity parameters ${\Omega}_{\lambda}\;({\lambda}=2,\;4,\;6)$ of $Sm^{3+}$(aquo) and ${SmL_3}^{3-}$ complexes are also evaluated by applying the Judd-Ofelt theorem to the observed oscillator strengths. The values of the intensity parameters are compared and discussed in term of structural properties of the complexes. In addition, the fluorescence spectra are reported for the Sm(III) complex systems under mild alkaline condition. The excitation from the $^6H_{5/2}$ ground state to any excited states lying above the emitting energy level $(^4G_{5/2})$ produces four fluorescence bands, following nonradiative transitions from a certain excited state to the $^4G_{5/2}$ state. The ratios of oscillator strengths of ${SmL_3}^{3-}$ complexes to that of $Sm^{3+}$(aquo) are also evaluated from the fluorescence spectra and compared to the results obtained from the absorption bands.

• Preventive Nutrition and Food Science
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• 제10권1호
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• pp.29-33
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• 2005

To facilitate establishing regulations for irradiated foods, Korean traditional soybean-based fermented powdered doenjang (PD), kanjang (PK), kochujang (PKC) and chungkukjang (PC) were irradiated at 1, 3, 5 and 7 kGy, and subjected to irradiation detection analyses as part of establishing a database for detecting irradiated foods. Photostimulated luminescence (PSL) and electron spin resonance (ESR) were applied as the detection methods. Using PSL analysis, the irradiated PD, PK and PKC could be easily distinguished from the non-irradiated ones, while irradiation of the PC at 5 kGy or higher was detectable. The ESR spectra of the irradiated PD, PK and PKC exhibited symmetrical multiplet lines, which might be induced from the crystalline sugar, whereas, the PC showed a single signal at the paramagnetic centers. The signal intensity increased with incremental increases of irradiation doses distinguishing the irradiated samples from the control. In addition, the peak height also revealed that irradiation induced an increment in the intensity of single and/or multiplet lines of the ESR signals, resulting in clear confirmation of irradiation. Thus, the data from this study could be used as references for detecting irradiated soybean-based fermented powdered sauces.

• 한국식품과학회지
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• 제33권4호
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• pp.423-426
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• 2001

건조과일의 방사선 조사여부를 확인하기 위하여 감마선 조사로 생성된 라디칼을 ESR spectroscopy를 이용하여 측정하였다. 건조된 바나나, 파인애플 및 피스타치오를 0, 0.5, 1, 2, 5 kGy의 Co-60 감마선을 조사한 후 이를 시료로 Bruker Win-EPR spectrometer를 이용하여 측정하였다. 방사선 조사된 파인애플과 바나나는 sugar radical의 전형적인 매우 복잡한 multiplet을 나타내었으며, 피스타치오의 신호형태는 singlet을 나타내어 비조사 시료와 확실히 구별되었다. 적용선량의 범위에서$(0.5{\sim}5\;kGy)$ 조사선량이 증가함에 따라 라디칼의 농도는 직선적으로 증가하였으며, 이때 $R^2$값은 $0.9874{\sim}0.9974$의 범위로 매우 높았다. 또 이들 라디칼들은 상온에서 40일간 저장 후에도 관찰이 가능하여 건조과일의 유통 중 방사선 조사여부의 판별에 ESR spectroscopy의 이용 가능성이 확인되었다.

• Applied Biological Chemistry
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• 제32권1호
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• pp.1-7
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• 1989

Methyl linolenate를 자동산화반응(自動酸化反應)의 model 화합물(化合物)로 선정(選定)하여 실온(室溫)에서 90m1/min.의 air flow rate로 96시간(時間) 산화(酸化)시켰으며 여기서 얻어진 산화생성물(酸化生成物)을 TLC로 분리(分離)한 다음 각(各) 분획물(分劃物)을 ir, uv, nmr로 분석(分析)하였다. 분광기기분석(分光機器分析) 결과(結果)는 서로 일치(一致)하였으며 Rf. 0.28과 $0.15{\sim}0.10$의 화합물(化合物)들이 hydroperoxide와 cis, trans-substituted diene인 것으로 확인(確認)되었고 주(主)로 cis, transconjugated diene system과 약간(若干)의 trans, trans-configuration인 것으로 밝혀졌다. 특(特)히 $5.83{\sim}6.60ppm$에서 나타난 multiplet 부위(部位)는 산화생성물(酸化生成物)들의 화학구조(化學構造)를 결정(決定)함에 있어서 큰 도움을 줄 것으로 생각하기 때문에 앞으로 많은 연구(硏究)가 요망(要望)된다.

• 한국자기공명학회논문지
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• 제10권1호
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• pp.59-73
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• 2006

Spin-lattice relaxation pathway of $CH_2$ spin system by two dimensional NOESY sequence has been discussed. Two-dimensional spectra governed by dipolar relaxation mechanism were simulated in term of transfer mode, the generalization of conventionally used magnetization mode in one dimension. The transfer matrix directly related to the Redfield relaxation matrix can be constructed by the multiplet of transfer mode. The observable relaxation transfer modes causes to variation of the off-diagonal signal intensity of phase sensitive NOESY spectra from which variable spectral density can be extracted with simple group theoretical calculation. The variation of the J-coupling peak intensity as a function of the mixing time in 2-D spectra for $n-Undecane-5-^{13}C$ and Bromoacetic $2-^{13}C$ acid has been theoretically traced.