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질소-산소계 시프염기 리간드의 합성과 전이금속(Ⅱ) 착물의 안정도상수결정
김선덕,송찬익,김준광,김정성 한국환경과학회 2004 한국환경과학회지 Vol.13 No.9
N,N-bis(2-salicylaldehyde)dipropylenetriamine(5-Hsaldipn), N,N-bis(5-bromosalicyl-aldehyde) dipropylenetriamine (5-Brsaldipn), N,N-bis(5-chlorosalicylaldehyde)dipropylene-triamine(5-Clsaldipn), N,N-bis(2-hydroxy-5-methoxybenzaldehyde)dipropylenetriamine(5-OCH₃saldipn) and N,N-bis (2-hydroxy-5-nitrobenzaldehyde)dipropylenetriamine (5-NO₂saldipn) were synthesized and characterized by elemental analysis, infrared spectrometry, NMR spectrometry and mass spectrometry. Their proton dissociation constants were determined in 70% dioxane/30% water solution by potentiometric. Stability constants of the complexes between these ligands and the metal ions such as Cu(Ⅱ), Ni(Ⅱ) and Zn(Ⅱ) were measured in dimethyl sulfoxide by a polarographic method. Stability constants for the ligands were in the order of 5-OCH₃> 5-H > 5-Br > 5-Cl > 5-NO₂saldipn. Enthalpy and entropy changes were obtained in negative values.
마이크로머시닝을 이용한 Bump형 Probe Card의 제조
최원익,김용대,심준환,이종현 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
Probe card is the most important part of testing IC chips. This work was related to silicon vertical probe card which enabled to simultaneously test multiple semiconductor chips. We presented Bump-type vertical probe card. It was fabricated by dry etching using RIE technique, isotropic etching, and bulk-micromachining on SDB wafer. The process used in this work was very simple and reproducible, which had good controllability in the probe card dimension and spacing. It is expected that the fabricated probe card can reduce testing time, can promote productivity and enables bum-in test.
최익수,김기준,전병훈 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Pseudoaneurysms form when a hemorrhage or hematoma from the injured arterial wall is replaced with an fibrous vessel wall, which is dilated by subsequent pulsating pressure. Recently, we experienced a patient with a pulsatile preauricular mass, measuring about 1.5× 1.5 cm, sustained from blunt trauma by the baseball. The presumptive diagnosis of pseudoaneurysm of the superficial temporal artery was made by Doppler sonography. Under local anesthesia, the aneurysm was excised en bloc following ligation. We report the rare case with a review of literatures.
권재현,김봉준,김민규,염익태,김형수 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4
The pretreatment process was carried out to solubilize the sewage sludge for enhancing its biodegradability using alkaline treatment, ultrasonic treatment(l5kHz), ozone treatment and different combination of these three methods: alkaline followed by ultrasonic as well as ozone, and ultrasonic followed by alkaline. The solubilization efficiency was evaluated based on the SCOD/TCOD ratio and VSS/TS ratio. In results, the proper condition of alkaline treatment was shown as 30meq/l of NaOH, pH 12 and 3hours of reaction time. Solubilization efficiency increased to 17% from initial 2% based on SCOD/TCOD ratio under this condition. In ultrasonic treatment, the higher ultrasonic power, the longer treatment time and the lower sludge volume resulted in higher solubilization respectively. There was a rapid increase in solubilization efficiency after 20 minute, then it was measured as 32% of SCOD/TCOD ratio in 1 hour at a ultrasonic power of 1,300W with 1/sludge. Solubilization efficiencies in combined treatment using alkaline and ultrasonic were 47-53% higher than single treatment at a sonicated time of 1 hour. Ozone treatment followed by alkaline treatment also represented the enhanced solubilization compared to ozone treatment. Therefore, ultrasonic or ozone treatment assisted by alkaline could achieve the short treatment time as well as high solubilizetion efficiency.
Tunneling Magnetoresistance in Sintered Fe_3O_4 Samples Diluted with Fe and α-Fe_2O_3
Kim, Ick-Jun,Moon, Seong-In 대한금속학회 2002 METALS AND MATERIALS International Vol.8 No.1
Electric transport and magnetoresistance characteristics were investigated for Fe_3O_(4-x) Fe(x=0, 10, 20 wt.%) samples and Fe_3O_(4-α)-Fe_2O_3 samples sintered at 500℃. For composition dependence of Fe_3O_(4-x) Fe samples, the largest room temperature MR, 3.3% at 10 kOe, was obtained from a Fe_3O_4-10 Fe sample. For the surface heat treatment dependence of Fe_3O_4 powders, the largest room temperature MR, 4% at 10 kOe, was obtained from a Fe_3O_(4-α)-Fe_2O_3 sample sintered with Fe_3O_4 powders heated at 200℃ in air. It was found that these enhanced MR ratios always appear together with the appropriate excess resistance which is regarded as the tunneling barrier. These enhanced MR ratios of Fe_3O_4-10 Fe and Fe_3O_(4-α)-Fe_2O_3 samples can be explained by the increased interparticle contact sites and the appropriate thickness of α-Fe_2O_3, respectively.
PI3K款 is required for NMDA receptor??dependent long-term depression and behavioral flexibility
Kim, Jae-Ick,Lee, Hye-Ryeon,Sim, Su-eon,Baek, Jinhee,Yu, Nam-Kyung,Choi, Jun-Hyeok,Ko, Hyoung-Gon,Lee, Yong-Seok,Park, Soo-Won,Kwak, Chuljung,Ahn, Sung-Ji,Choi, So Yoen,Kim, Hyun,Kim, Kyoung-Han,Backx Nature Publishing Group, a division of Macmillan P 2011 NATURE NEUROSCIENCE Vol.14 No.11
<P>Phosphatidylinositol 3-kinase (PI3K) has been implicated in synaptic plasticity and other neural functions in the brain. However, the role of individual PI3K isoforms in the brain is unclear. We investigated the role of PI3K gamma in hippocampal-dependent synaptic plasticity and cognitive functions. We found that PI3K gamma has a crucial and specific role in NMDA receptor (NMDAR)-mediated synaptic plasticity at mouse Schaffer collateral-commissural synapses. Both genetic deletion and pharmacological inhibition of PI3K gamma disrupted NMDAR long-term depression (LTD) while leaving other forms of synaptic plasticity intact. Accompanying this physiological deficit, the impairment of NMDAR LTD by PI3K gamma blockade was specifically correlated with deficits in behavioral flexibility. These findings suggest that a specific PI3K isoform, PI3K gamma, is critical for NMDAR LTD and some forms of cognitive function. Thus, individual isoforms of PI3Ks may have distinct roles in different types of synaptic plasticity and may therefore influence various kinds of behavior.</P>
Changes of depression and job stress in workers after merger without downsizing
Jun Ick Jung,Jun Seok Son,Young Ouk Kim,Chang Ho Chae,Chan Woo Kim,Hyoung Ouk Park,Jun Ho Lee,Young Hoo Shin,Jea Chul Ha 대한직업환경의학회 2018 대한직업환경의학회지 Vol.30 No.-
Background: Since the 1980s, restructuring, which includes downsizing, closures, mergers, and privatization, has expanded worldwide, and various studies have investigated its effect on health. However, previous studies have mainly focused on restructuring accompanied by massive lay-offs, and the effect of a merger on workers’ health is still controversial. This study aims to investigate changes in worker depression and job stress after a merger without downsizing, which is unusual in Korea. Methods: Repeated surveys were done in April 2014, April 2015, and April 2016 involving the participation of 209 subjects. Participants were divided into two groups, which were comprised of blue-collar workers (104) and whitecollar workers (105). Sociodemographic characteristics, including age, education level, job tenure, gender, marital status, smoking status, and alcohol consumption, were measured via a survey. To determine the level of depression, the Korean version of the Center for Epidemiologic Studies Depression Scale (CES-D) was employed, and to investigate job stress, the Korean Occupational Stress Scale-Short Form (KOSS-SF) was used. For statistical analyses, Pearson’s chi-square test, the Student’s t-test, and repeated measure analysis of variance (ANOVA) were performed. Results: The results showed that depression (CES-D, F[2, 400] = 0.466, p = 0.628) was changed but without significance and job stress (KOSS-SF, F[1.899, 379.831] = 3.192, p = 0.045) were significantly different. The betweengroup difference in the CES-D score between the blue- and white-collar workers by survey administration time was not statistically significant (F = 0.316, p = 0.574). The interaction between the survey time and occupational group was also not statistically significant (F = 0.967, p = 0.381). The between-group difference in the KOSS-SF total score was not statistically significant (F = 1.132, p = 0.289), and the interaction between the survey administration time and occupational group was also not significant (F = 0.817, p = 0.437). In the job stress subgroup analyses Job insecurity and Lack of reward showed a significant difference by survey administration time. Conclusion: This study showed that a merger without massive downsizing can cause negative health effects such as an changes in depression and increase in job stress. To improve the health of workers, both the immediate negative effects on health, and the long-term effects or their resolution over time should be considered prior to the merger.