에틸렌 염회비닐 공중합체의 열분해 특성연구

황택성,서정목,맹기석,송해영 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.2

PVC has been developed very rapidly as one of general useful resins, and many scientists have studied complimentary method for thermal stability to improve the disadventages of PVC. This study investigated to promote thermal stability by a VC-Ethylene copolymer synthesis of copolymer syntheses. The effect of the thermal stability was studies with different portion of Ethylene-VC copolymer. As the result, when ethylene copolymer was introduced, the thermal stability was promoted. So this report described the process and the result for such analysis.

Cr(Ⅲ)-EDTA착이온 [Credta(H_2O)]^-과 아세트산이온과의 치환반응의 평형상수에 미치는 압력의 효과

정종재,황정의,서형택 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-

The equilibrium constants of the substitution reaction of ethylenediaminetetraacetatoaquochromate(Ⅲ) ion with acetate ion were determined under high pressure by the spectroscopic method in order to learn how pressure governs the magnitude of the equilibrium constant of the reaction. 〔Cr(edta)(H_2O)〕^- +OA_c- ⇔ 〔Cr(edta)(OA_c)〕^2- + H_2O The reaction was analyzed with the thermodynamic parameters calculated from the equilibrium constants. The equilibrium constants increased as the pressure and the temperature did. The enthalpy change (ΔH˚), entropy change (ΔS˚) and volume change (ΔV˚) of the reaction were obtained by the equilibrium constants change with the pressure and the temperature. The isoequilibrium temperatures were obtained from the isokinetic relationship between ΔH˚ and ΔS˚ for the pressure change in the reaction. From all of the above results, it was found that this reaction was endothermic and enthalpy controlled reaction in the experimental temperature.

Cr(Ⅲ)-EDTA착이온 [Credta(H_2O)]￣과 아세트산이온과의 치환반응의 평형상수에 미치는 압력의 효과

정종재,황정의,서형택 慶北大學校 1982 論文集 Vol.33 No.-

The equilibrium constants of substitution reaction of ethylenediaminetetraacetatoaquochromate(Ⅲ) ion with acetate ion were determined under high pressure by the spectroscopic method in order to learn how pressure governs the magnitude of the equilibrium constant of the reaction. 〔Cr(edta)(H_2O)〕^-+OAc^-??〔Cr(edta)(OAc)〕^2-+H_2O The reaction was analyzed with the thermodynamic parameters calculated from the equilibrium constants. The equilibrium constants increased as the pressure and the temperature did. The enthalpy change (ΔH°), entropy change (ΔS°) and volume change (ΔV°) of the reaction were obtained by the equilibrium constants change with the pressure and the temperature. The isoequilibrium temperatures were obtained from the isokinetic relationship between ΔH° and ΔS° for the pressure change in the reaction. From all of the above results, it was found that this reaction was endothermic and enthalpy controlled reaction in the experimental temperature.

자발성 뇌교출혈 환자의 예후에 관한 임상 분석

조재영,석종식,민병국,권정택,최덕영,황성남,김영백,박승원 중앙대학교 의과대학 의과학연구소 2002 中央醫大誌 Vol.27 No.1

Patients with spontaneous pontine hemorrhage very often develop setvere disturbances of consciousness,pupilary abnormalities, respiratory and motor. They have high mortality rate. Therefore, I analyzed the correlation between the Glasgow outcome scale(GOS)and clincial manifestations or computed tomographic(CT)findings in 48 patients with spontaneous pontine hemorrhage to clarify factors predicting the prognosis. I examined 48 Patients with spontaneous pontine hemorrhage; 33 males and 15 females, age 54.6±8.99(mean±S.D.;range 39 to 68)brought to our hospital between January 1995 and December 1999, retrospectively. Correlations between the clinical manifestations, CT findings and the GOS was assessed with multivariate regression analysis. The results were as follow: 1) Patients with the pontine hemorrhage were of 8.8% in those with intracerebral hemorrhage. The ratio of male and female was 33 to 15. The incidence of age is eqial to 40,50 and 60. Total mortality was 41.6%. 2) The poor prognostic factor were that; Glasgow coma scale(GCS)3∼8, irregular respiration. pupilary abnormality, quadriplegia, Brain CT typeⅠ(massive), hydrocephalus, extrapontine extension, Intraventricular hemorrhage(IVH). These clinical analysis should be useful in determining the level of care and future resuscitative efforts.

무연탄 분말의 사과나무 생산성에 미치는 영향 (1)

宋承達,李容夏,鄭三澤,黃正儀 慶北大學校 1974 論文集 Vol.18 No.-

Effects of coal powder on the apple productivity were investigated from the plant eco-physiological point of view. 1) Light absorption by the dispersion of 10, 30 and 50g/㎡ of 54μ meshed coal powder was 42, 82 and 94% of the incident light, respectively. 2) Leaf area index of the coal treated apple tree on June (nearly maximum) was slightly larger than that of the control plant, i.e., 4.5-5.0 for Jonathan and 5.5-6.0 for Rolls Janet. Relative light intensity under this apple leaf population declined to 3.4-2.4% on June 26, 1974. 3) Application of coal powder on apple tree resulted in an increase of specific leaf area. 4) Assimilation rate measured by the half leaf method showed a decreased rate in the treated leaf. 5) Transpiration rate decreased by 9.6% on the coal powdered leaf. 6) Surplus photosynthesis of the apple leaf population was 31.1-32.7g/㎡/day from the estimation by the formula of Monsi-Saeki. 7) Growth rate of fruit diameter and shoot length showed the obstructive effect of coal treated apple tree. 8) Rate of June drop of the coal treated apple (50g/㎡) increased 11.0-15.7% as compared with that of the control plant.

Analysis of Scapular Dyskinesis Using Low-Dose 3D wing CT in Patients with Clavicle Fracture treated by Anatomical plate versus Non-anatomical plate

Jung-Taek Hwang 대한견주관절의학회 2021 대한견주관절학회 학술대회논문집 Vol.2021 No.3

Introduction and Background Clavicle fracture may cause a malposition and abnormal motion of scapula which could be diagnosed as a scapular dyskinesis. The purpose of this study is to analyze the scapular dyskinesis using low-dose 3D wing CT in patients with clavicle fracture treated using anatomical versus non-anatomical plate. Material and Method Thirty four participant with clavicle fracture who had been treated using plate were enrolled in this study. 17 patients treated using anatomical plate were classified into group 1 and the other 17 patients treated using non-anatomical plate into group 2. The 68 scapular movements of 34 patients were classified into 4 types by 3 blinded observers. Then, low-dose 3D wing CT was performed with patients prone, and 3 blinded observers measured 5 angles, consisting of upward rotation(UR), superior translation (ST), anterior tilting (AT), protraction (PRO), and internal rotation (IR). Comparative analysis of the 5 angles and visual type between the two groups were done. Results The mean ages were 47.6 ± 11.6 and 47.0 ± 16.2 years in group 1 and 2. In group 1, there are 15 males and 2 females. And in group 2, there are 14 males and 3 females. Visual typing was shown as table 1 without significant difference between the two groups (p=0.5553). The mean five angles of the two groups were as table 2. There were no statistically significant difference in the five angles between the two groups, also (p=.382, p=.771, p=.097, p=.621, and p=.961, respectively). Conclusions Low dose 3D wing CT well visualized the 5 angles of scapula with less radiation exposure. Anatomical and nonanatomical plates showed the similar effect in the scapular dyskinesis in patients with clavicle fracture.

관절경적 회전근개 봉합술에서 초음파유도 사각근간 상완신경총차단술과 병행한 관절경유도 상견갑신경차단술의 효과: 전향적 무작위 연구

Jung-Taek Hwang(황정택),Do-Young Kim,Sang-Soo Lee 대한견주관절의학회 2015 대한견주관절학회 학술대회논문집 Vol.2015 No.4

Acute Pulmonary Toxicity and Body Distribution of Inhaled Metallic Silver Nanoparticles

Jung-Taek Kwon,Arash Minai-Tehrani,Soon-Kyung Hwang,Ji-Eun Kim,Ji-Young Shin,Kyeong-Nam Yu,Seung-Hee Chang,Dae-Seong Kim,Yong-Taek Kwon,In-Ja Choi,Yun-Hee Cheong,Jun Sung Kim,Myung-Haing Cho 한국독성학회 2012 Toxicological Research Vol.28 No.1

The purpose of this study was to determine the acute pulmonary toxicity of metallic silver nanoparticles (MSNPs, 20.30 ㎚ in diameter). Acute pulmonary toxicity and body distribution of inhaled MSNPs in mice were evaluated using a nose-only exposure chamber (NOEC) system. Bronchoalveolar lavage (BAL) fluid analysis, Western blotting, histopathological changes, and silver burdens in various organs were determined in mice. Mice were exposed to MSNPs for 6 hrs. The mean concentration, total surface area, volume and mass concentrations in the NOEC were maintained at 1.93 × 10? particles/㎤, 1.09 × 10<SUP>10</SUP> ㎚²/㎤, 2.72 × 10<SUP>11</SUP> ㎚³/㎤, and 2854.62 ㎍/㎥, respectively. Inhalation of MSPNs caused mild pulmonary toxicity with distribution of silver in various organs but the silver burdens decreased rapidly at 24-hrs post-exposure in the lung. Furthermore, inhaled MSNPs induced activation of mitogen-activated protein kinase (MAPK) signaling in the lung. In summary, single inhaled MSNPs caused mild pulmonary toxicity, which was associated with activated MAPK signaling. Taken together, our results suggest that the inhalation toxicity of MSNPs should be carefully considered at the molecular level.

Polydeoxyribonucleotide and Polynucleotide Improve Tendon Healing and Decrease Fatty Degeneration in a Rat Cuff Repair Model

Hwang Jung-Taek,Lee Sang-Soo,한상학,Sherchan Binod,Panakkal Jiss Joseph 한국조직공학과 재생의학회 2021 조직공학과 재생의학 Vol.18 No.6

Background: After surgical repair of chronic rotator cuff tears, healing of the repaired tendons often fails and is accompanied by high-level fatty degeneration. Our purpose was to explore the effects of polydeoxyribonucleotide (PDRN) and polynucleotide (PN) on tendon healing and the reversal of fatty degeneration in a chronic rotator cuff tear model using a rat infraspinatus. Methods: Sixty rats were randomly assigned to the following three groups (20 rats per group: 12 for histological evaluation and 8 for mechanical testing): saline + repair (SR), PDRN + repair (PR), and PN + repair (PNR). The right shoulder was used for experimental intervention, and the left served as a control. Four weeks after detaching the infraspinatus, the torn tendon was repaired. Saline, PDRN, and PN were applied to the repair sites. Histological evaluation was performed 3 and 6 weeks after repair and biomechanical analysis was performed at 6 weeks. Results: Three weeks after repair, the PR and PNR groups had more CD168-stained cells than the SR group. The PR group showed a larger cross-sectional area (CSA) of muscle fibers than the SR and PNR groups. Six weeks after repair, the PR and PNR groups showed more adipose cells, less CD68-stained cells, and more parallel tendon collagen fibers than the SR group. The PR group had more CD 68-stained cells than the PNR group. The PR group showed a larger CSA than the SR group. The mean load-to-failure values of the PR and PNR groups were higher than that of the SR group, although these differences were not significant. CONCLUSION: PDRN and PN may improve tendon healing and decrease fatty degeneration after cuff repair. Background: After surgical repair of chronic rotator cuff tears, healing of the repaired tendons often fails and is accompanied by high-level fatty degeneration. Our purpose was to explore the effects of polydeoxyribonucleotide (PDRN) and polynucleotide (PN) on tendon healing and the reversal of fatty degeneration in a chronic rotator cuff tear model using a rat infraspinatus. Methods: Sixty rats were randomly assigned to the following three groups (20 rats per group: 12 for histological evaluation and 8 for mechanical testing): saline + repair (SR), PDRN + repair (PR), and PN + repair (PNR). The right shoulder was used for experimental intervention, and the left served as a control. Four weeks after detaching the infraspinatus, the torn tendon was repaired. Saline, PDRN, and PN were applied to the repair sites. Histological evaluation was performed 3 and 6 weeks after repair and biomechanical analysis was performed at 6 weeks. Results: Three weeks after repair, the PR and PNR groups had more CD168-stained cells than the SR group. The PR group showed a larger cross-sectional area (CSA) of muscle fibers than the SR and PNR groups. Six weeks after repair, the PR and PNR groups showed more adipose cells, less CD68-stained cells, and more parallel tendon collagen fibers than the SR group. The PR group had more CD 68-stained cells than the PNR group. The PR group showed a larger CSA than the SR group. The mean load-to-failure values of the PR and PNR groups were higher than that of the SR group, although these differences were not significant. CONCLUSION: PDRN and PN may improve tendon healing and decrease fatty degeneration after cuff repair.

Effect of serum testosterone and percent tumor volume on extra-prostatic extension and biochemical recurrence after laparoscopic radical prostatectomy

Hwang, Eu Chang,Yu, Seong Hyeon,Jo, Yang Hyun,Jung, Seung Il,Kang, Taek Won,Kwon, Dong Deuk,Choi, Chan,Heo, Suk Hee,Hwang, Jun Eul,Jung, Sung-Hoon,Jung, Tae-Young Medknow PublicationsMedia Pvt Ltd 2016 ASIAN JOURNAL OF ANDROLOGY Vol.18 No.1

<P>Several studies have revealed that the preoperative serum testosterone and percent tumor volume (PTV) predict extra-prostatic extension (EPE) and biochemical recurrence (BCR) after radical prostatectomy. This study investigated the prognostic significance of serum testosterone and PTV in relation to EPE and BCR after laparoscopic radical prostatectomy (LRP). We reviewed 520 patients who underwent LRP between 2004 and 2012. PTV was determined as the sum of all visually estimated tumor foci in every section. BCR was defined as two consecutive increases in the postoperative prostate-specific antigen (PSA) >0.2 ng ml<SUP>−1</SUP>. The threshold for serum total testosterone was 3.0 ng ml<SUP>−1</SUP>. Multivariate logistic regression was used to define the effect of variables on the risk of EPE and BCR. A low serum testosterone (<3.0 ng ml<SUP>−1</SUP>) was associated with a high serum PSA, Gleason score, positive core percentage of the prostate biopsy, PTV, and all pathological variables. On multivariate analysis, similar to previous studies, the serum PSA, biopsy positive core percentage, Gleason score, and pathological variables predicted EPE and BCR. In addition, low serum testosterone (<3.0 ng ml<SUP>−1</SUP>, adjusted OR, 8.52; 95% CI, 5.04–14.4, <I>P</I> = 0.001) predicted EPE and PTV (adjusted OR, 1.02; 95% CI, 1.01–1.05, <I>P</I> = 0.046) predicted BCR. In addition to previous predictors of EPE and BCR, low serum testosterone and PTV are valuable predictors of EPE and BCR after LRP.</P>