Blue Luminescent Zn(II) and Hg(II) Complexes with 2-[4-(Dimethylamino)styryl]pyridine; Structural and Luminescent Properties

Hoe-Joo Seo,Jeong Sim Ryu,Ki-Sun Nam,강성권,Sun Young Park,김영인 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12

Blue Luminescent Zn(II) and Hg(II) Complexes with 2-[4-(Dimethylamino)styryl]pyridine; Structural and Luminescent Properties

Seo, Hoe-Joo,Ryu, Jeong-Sim,Nam, Ki-Sun,Kang, Sung-Kwon,Park, Sun-Young,Kim, Young-Inn Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12

Forecasting Winning Rates in Major League Baseball Based on Fuzzy Logic

Woo-Joo Lee(이우주),Hyo-Jin Jhang(장효진),Seo-Hee Lee(이서희),Seung-Hoe Choi(최승회) 한국지능시스템학회 2020 한국지능시스템학회논문지 Vol.30 No.5

퍼지 시계열은 시계열의 자료 수가 충분하지 않거나 자료의 구조가 특정 되지 않을 때에 효율적인 방법이다. 본 연구는 1901년부터 2019년까지 미국 메이저 리그에 소속된 16개 팀의 승률에 대한 종속성과 상관성을 이용하여 승률에 대한 예측을 위하여 퍼지 논리와 퍼지 분할 그리고 F-변환을 이용한다. 그리고 본 연구에서 제시된 퍼지 시계열의 결과를 전통적인 Arima 모형과 증가하는 자료에 대한 미분방정식을 이용하는 Grey 방법, 그리고 장단기기억(Long Short Term Memory, LSTM) 방법의 결과와 비교한다. 본 연구에서 제시된 퍼지 시계열 분석에 대한 효율성을 조사하기 위해 평균절대백분율오차와 편차와 오차의 비 그리고 상관관계를 사용한다. A fuzzy time series is used efficiently when there are not enough data in a time series that is continuously recorded over time, or when data pattern cannot be expressed as a specific function. This study uses a fuzzy time series to predict the winning rates in Major League Baseball (MLB), using fuzzy partition and F-transform for the winning percentage of 16 teams in the MLB from 1901 to 2019. The results of the fuzzy time series presented in this study are compared with the results of the Box-Jenkins method and a Grey model using a differential equation for the increasing data, as well as the Long Short Term Memory (LSTM) model. To investigate the efficiency of the fuzzy time series analysis presented in this study, we use the mean absolute percentage error (MAPE), correlation, and ratio of deviation error.

Extremity CT검사 시 Cradle Angle이 피사체의 선량과 화질에 미치는 영향에 관한 연구

박병서(Byeong-seo Park),이민수(Min-su Lee),유희성(Hoe-seong Yoo),이성현(Sung-hyeon Lee),정우준(Woo-joon Jung),주명식(Myeong-sik Joo),조인완(In-wan Jo),박태현(Tae-hyeon Park) 대한CT영상기술학회 2018 대한CT영상기술학회지 Vol.20 No.1

Purpose : Correct positioning patients is the important factor for diagnosis and direction of treatment. Despite of technicians effort, it is difficult because of patients build and extremity, splint, and gips. In this study, we try to compare and analyze the effect of cradle angle on the dose and image quality in the case that the subject is correct with the center of cradle and the opposite case that subject get tilted by angle of cradle. Material and method : The phantoms used in the study were acryl phantom sized 32 cm, called body phantom and the anthropomorpic phantom (RS-114T, RS-116T Radiology Support Devices, Alderson, USA). We compared the dose and the image quality using the value measured in the three cases that the center of cradle was correct with phantom, 10 cm far to the left, and 10 cm far to the right. All evaluation of the dose was done using Kruskal-Wallis test to evaluate the significance. In case of Acryl phantom, the index of coincidence was evaluated by Intra calss correlation, ICC Result : As a result, each surface dose in the direction of 3 o clock and 9 o clock was 2.9±0.5 and 2.7±0.1 compared to the depth dose, 1.8±0.1 at the center. Using Kruskal-Wallis test, we found out there was significant result at the center and in 3 o clock and 9 o clock (0.001<p). According to the result of ICC test using Acryl phantom, there was statistically significant result by 0.915 (95 % CI=0.786~0.966) between the center and the direction of 9 c clock, and 0.991 (95 % CI=0.977~0.99) between the center and the direction of 9 o clock.In the evaluation of the dose using the anthropomorpic phantom, there was significant result from hand & wrist phantom and ankle & foot phantom by using Kruskal-Wallis test, because the measure about CTDI volume value at hand and wrist was 0.02<p, and at foot and ankle was 0.01<p. In case to evaluate image quality, SNR when the subject was correct with the center of cradle was 46.6 ±2.1, 44.6±3.4. SNR in the case that subject was 10 cm far to the left from the center of the cradle was 52.7±3.1, 50.2±1.4, and 10 cm far to the right was 42.2±2.8, 46.0±3.0. There was the significant result statistically (0.03<0.05). Also there was difference more than twice in the case that the subfect was far to the left or right compared to the alignment with center. Conclusion : In this study, it didn t matter in the dose and image quality even though the subject moved to the left or right in case of Extremity CT, but the distortion of image happened and the reproducibility of the shape got wores by the CT cradle tilted. That is the reason why the algorithm is applied using software to compensate for that. Also the appropriate instrument need to be used to raise the reproducibility of image. 목적 : Extremity CT 검사 시 올바른 환자의 위치 잡이는 진단 및 치료방향에 있어 중요한 요소이며, 좁은 cradle과 cradle angle, 환자의 체구와 양측 사지 그리고 각종 부목 (Splint), 고정붕대 (Gips) 등은 검사자의 노력에도 불구하고 적절한 환자의 자세를 잡는 데 한계가 준다. 이에 피사체가 cradle 중심에 일치한 경우와 cradle angle의 영향으로 피사체가 기울어졌을 경우의 cradle angle이 선량과 화질에 미치는 영향을 비교 분석하고자 한다. 대상 및 방법 : 실험에 사용된 팬텀은 Acryl phantom (지름 32 cm body phantom), 인체모형팬텀인 (RS-114T, RS-116T Radiology Support Devices, Alderson, USA)사용하였고, phantom의 중심부의 일치하였을 때 측정된 값과 좌측으로 10 cm, 우측으로 10 cm 이동하여 측정된 값을 이용하여 선량과 화질을 비교 하였다. 모든 선량 평가는 Kruskal-Wallis test 통해 유의성을 평가하였고, acryl phantom은 급내상관계수 (Intra calss correlation, ICC)를 이용하여 측정값의 일치도를 평가하였다. 결과 : acryl phantom을 이용한 선량평가에서는 중심부인 심부선량보다 표면선량 (3시 방향, 9시 방향)에서의 선량은 9시방향의 경우 2.7±0.1, 3시방향의 경우 2.9±0.5, 중심부인 심부선량에서는 1.8±0.1로 측정되었고 중심부와 9시 3시 방향에서 Kruskal-Wallis 검정을 통해 유의한 결과를 나타내었다 (0.001<p). acryl phantom을 이용한 선량의 ICC test결과 중심부와 9시 방향에서는 0.915 (95 % CI=0.786~0.966), 중심부와 3시에서는 0.991 (95 % CI=0.977~0.99)으로 중심부와 3시, 9시 방향에서의 측정값의 일치도는 통계적으로 유의한 결과를 나타내었다. 인체팬텀 선량 평가에서는 Hand & wrist phantom, foot & ankle 측정한 결과 중심에 일치하는 경우와 좌, 우측으로 이동한 경우 Kruskal-Wallis 검정을 통해 CTDIvol값에 대해 hand & wrist는 0.02<p, foot & ankle은 0.01<p로 유의성이 있었고, DLP 값에 대해 hand & wrist는 0.9>p로 유의성이 없는 반면 foot & ankle 0.01<p 으로 유의성을 보였다. 화질평가의 경우 cradle의 중심으로부터 일치한 경우의 SNR 46.6±2.1, 44.6±3.4이며, 좌측으로 10 cm 벗어난 경우 SNR은 52.7±3.1, 50.2±1.4, 우측으로 10 cm 벗어난 경우 SNR은 42.2±2.8, 46.0±3.0 으로 측정되었고, 통계적으로 유의한 결과를 나타내었다 (0.03<0.05). 화질의 정성적 평가에서는 4개의 항목 중에 B, D항목 (영상의 회전, 3D reformation)에서 좌, 우측으로 이동한 경우 중심정렬보다 2배 이상의 차이를 보였다. 결론 : 본 연구를 통해 Extremity CT 검사 시 피사체가 좌, 우측으로 이동하여 검사하면 선량과 화질에는 큰 영향이 없다는 결과를 나타내었지만, CT cradle의 기울기에 따라 영상의 왜곡과 형태의 재현성이 떨어지므로 이에 대한 보상으로 소프트웨어를 이용한 영상 기법을 적용 시키거나 cradle 기울기의 적절한 보상 및 보조기구의 활용을 통해 영상의 재현성을 높여야 할 것으로 생각된다.

Tuning Photophysical and Electrochemical Properties of Heteroleptic Cationic Iridium(III) Complexes Containing Substituted 2-Phenylquinoxaline and Biimidazole

Nallathambi Sengottuvelan,Hoe-Joo Seo,강성권,김영인 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8

Design and syntheses of four red phosphorescent heteroleptic cationic iridium(III) complexes containing two substituted phenylquinoxaline (pqx) or benzo[b]thiophen-2-yl-pyridin (btp) main ligands and one 2,2'-biimidazole (H2biim) ancillary ligand are reported: [(pqx)2Ir(biim)]Cl (1), [(dmpqx)2Ir(biim)]Cl (2), [(dfpqx)2Ir(biim)]Cl (3),[(btp)2Ir(biim)]Cl (4). Complex 1 showed a distorted octahedral geometry around the iridium(III) metal ion with cis metallated carbons and trans nitrogen atoms. The absorption, emission and electrochemical properties were systematically evaluated. The complexes exhibited red phosphorescence in the spectral range of 580 to 620 nm with high quantum efficiencies of 0.58 - 0.78 in both solution and solid-state at room temperature depending on the cyclometalated main ligands. The cyclic voltammetry of the complexes (1-3) showed a metal-centered irreversible oxidation in the range of 1.40 to 1.90 V as well as two quasi reversible reduction waves from ‒1.15 to ‒1.45 V attributed to the sequential addition of two electrons to the more electron accepting heterocyclic portion of two distinctive cyclometalated main ligands, whereas complex 4 showed a reversible oxidation potential at 1.24 V and irreversible reduction waves at ‒1.80 V.

Tuning Photophysical and Electrochemical Properties of Heteroleptic Cationic Iridium(III) Complexes Containing Substituted 2-Phenylquinoxaline and Biimidazole

Sengottuvelan, Nallathambi,Seo, Hoe-Joo,Kang, Sung-Kwon,Kim, Young-Inn Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.8

Design and syntheses of four red phosphorescent heteroleptic cationic iridium(III) complexes containing two substituted phenylquinoxaline (pqx) or benzo[b]thiophen-2-yl-pyridin (btp) main ligands and one 2,2'-biimidazole (H2biim) ancillary ligand are reported: [$(pqx)_2$Ir(biim)]Cl (1), [$(dmpqx)_2$Ir(biim)]Cl (2), [$(dfpqx)_2$Ir(biim)]Cl (3), [$(btp)_2$Ir(biim)]Cl (4). Complex 1 showed a distorted octahedral geometry around the iridium(III) metal ion with cis metallated carbons and trans nitrogen atoms. The absorption, emission and electrochemical properties were systematically evaluated. The complexes exhibited red phosphorescence in the spectral range of 580 to 620 nm with high quantum efficiencies of 0.58 - 0.78 in both solution and solid-state at room temperature depending on the cyclometalated main ligands. The cyclic voltammetry of the complexes (1-3) showed a metal-centered irreversible oxidation in the range of 1.40 to 1.90 V as well as two quasi reversible reduction waves from -1.15 to -1.45 V attributed to the sequential addition of two electrons to the more electron accepting heterocyclic portion of two distinctive cyclometalated main ligands, whereas complex 4 showed a reversible oxidation potential at 1.24 V and irreversible reduction waves at -1.80 V.

한국인에서의 무과립구증 발병율 조사연구 -제4상 임상시험을 위한 기초자료조사-

안윤옥,박병주,이무송,김병국,구홍회,서철원 大韓臨床藥理學會 1993 臨床藥理學會誌 Vol.1 No.1

Blue Emitting Cationic Iridium Complexes Containing Two Substituted 2-Phenylpyridine and One 2,2'-Biimidazole for Solution-Processed Organic Light-Emitting Diodes (OLEDs)

Seong-Jae Yun,김영인,Hoe-Joo Seo,Myungkwan Song,진성호 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11

Two new blue emitting cationic iridium(III) complexes with two substituted 2-phenlypyridine ligands as main ligands and one 2,2'-biimidazole as an ancillary ligand, [(L1)2Ir(biim)]Cl (1) and [(L2)2Ir(biim)]Cl (2), where L1 = 2-(2',4'-difluorophenyl)-4-methylpyridine, L2 = 2-(2',4'-difluoro-3'-trifluoromethylphenyl)-4-methylpyridine and biim = 2,2'-biimidazole, were synthesized for applications in phosphorescent organic lightemitting diodes (PhOLEDs). Their photophysical, electrochemical and electroluminescent (EL) device performances were examined. The photoluminescent (PL) spectra revealed blue phosphorescence in the 450 to 485 nm range with a quantum yield of more than 10%. The iridium(III) compounds studied showed good solubility in organic solvents with no solvatochromism dependent on the solvent polarity. The solutionprocessed OLEDs were prepared with the configuration, ITO/PEDOT:PSS (40 nm)/mCP:Ir(III) (70 nm)/ OXD-7 (20 nm)/LiF (1 nm)/Al (100 nm), by spin coating the emitting layer containing the mCP host doped with the iridium phosphors. The best performance of the fabricated OLEDs based on compound 1 showed an external quantum efficiency of 4.5%, luminance efficiency of 8.52 cd A−1 and blue emission with the CIE coordinates (x,y) of (0.16, 0.33).

Novel Cationic 2-Phenylpyridine-based Iridium(III) Complexes Bearing an Ancillary Phosphine Ligand: Synthesis, Photophysics and Crystal Structure

Ma, Ai-Feng,Seo, Hoe-Joo,Jin, Sung-Ho,Yoon, Ung-Chan,Hyun, Myeong-Ho,Kang, Sung-Kwon,Kim, Young-Inn Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.11

Three novel phosphorescent 2-phenylpyridine-based iridium(III) complexes, $[(ppy)_2Ir(P\^{}N)]PF6\;(1),\;[(dfppy)_2Ir(P\^{}N)]PF_6$ (2), and $[(dfmppy)_2 Ir(P\^{}N)]PF6$ (3), where $P\^{}N$ = 2-[(diphenylphosphino)methyl]pyridine (dppmp), were synthesized and characterized. The absorption, photoluminescence, cyclic voltammetry and thermal stability of the complexes were investigated. The complexes showed bright blue luminescences at wavelengths of 448 $\sim$ 500 nm at room temperature in $CHCl_3$ and revealed that the $\pi$-acceptor ability of the phosphorous atom in the ancillary dppmp ligand plays an important role in tuning emission color resulting in a blue-shift emission. The single crystal structure of $[(dfmppy))_2Ir(P\^N)]PF_6$ was determined using X-ray crystallography. The iridium metal center adopts a distorted octahedral structure coordinated to two dfmppy and one dppmp ligand, showing cis C-C and trans N-N chelate dispositions. There is a $\pi-\pi$ overlap between π electrons delocalized in the difluorophenyl rings.

Blue Emitting Cationic Iridium Complexes Containing Two Substituted 2-Phenylpyridine and One 2,2'-Biimidazole for Solution-Processed Organic Light-Emitting Diodes (OLEDs)

Yun, Seong-Jae,Seo, Hoe-Joo,Song, Myungkwan,Jin, Sung-Ho,Kim, Young Inn Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11

Two new blue emitting cationic iridium(III) complexes with two substituted 2-phenlypyridine ligands as main ligands and one 2,2'-biimidazole as an ancillary ligand, $[(L1)_2Ir(biim)]Cl$ (1) and $[(L2)_2Ir(biim)]Cl$ (2), where L1 = 2-(2',4'-difluorophenyl)-4-methylpyridine, L2 = 2-(2',4'-difluoro-3'-trifluoromethylphenyl)-4-methylpyridine and biim = 2,2'-biimidazole, were synthesized for applications in phosphorescent organic light-emitting diodes (PhOLEDs). Their photophysical, electrochemical and electroluminescent (EL) device performances were examined. The photoluminescent (PL) spectra revealed blue phosphorescence in the 450 to 485 nm range with a quantum yield of more than 10%. The iridium(III) compounds studied showed good solubility in organic solvents with no solvatochromism dependent on the solvent polarity. The solution-processed OLEDs were prepared with the configuration, ITO/PEDOT:PSS (40 nm)/mCP:Ir(III) (70 nm)/OXD-7 (20 nm)/LiF (1 nm)/Al (100 nm), by spin coating the emitting layer containing the mCP host doped with the iridium phosphors. The best performance of the fabricated OLEDs based on compound 1 showed an external quantum efficiency of 4.5%, luminance efficiency of 8.52 cd $A^{-1}$ and blue emission with the CIE coordinates (x,y) of (0.16, 0.33).