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Transport Property of Associated Liquids : Viscosity & Diffusion
Rhew, Jong-ha 영남이공대학 1979 論文集 Vol.8 No.-
液體分子들이 cluster를 만들어 행동한다는 가정에서 粘度溪水 η와 擴散계수 D가 다음고 같이 주어짐을 알았다. η=4π(gu)^(1/2) σ/(3.5)(3RT)^(1/2) D=C_D ρ^(1/3)T^(3/2)q^5/6)б^-1 여기서 q: cluster을 內의 分子數 μ: 液體의 分子量 σ: 표면장력 T: 溫度 ρ: 液體의 密度 C_D:constant 液體分子들이 cluster를 만들어 행동한다는 가정에서 粘度溪水 η와 擴散계수 D가 다음고 같이 주어짐을 알았다. η=4π(gu)^(1/2) σ/(3.5)(3RT)^(1/2) D=C_D ρ^(1/3)T^(3/2)q^5/6)б^-1 여기서 q: cluster을 內의 分子數 μ: 液體의 分子量 σ: 표면장력 T: 溫度 ρ: 液體의 密度 C_D:constant
Thermodynamic Properties of Associated Solution : Acetone-Chloroform mixture
Shin, Hong Seub,Rhew, Jong Ha 영남이공대학 1974 論文集 Vol.3 No.-
2成分溶液에서 溶質과 溶媒間에만 會合이 일어나는 境遇인 acetone-chlolroform系에 있어서 chloroform의 水素와 acetone의 酸素間의 水素結合에 의하여 會合이 일어나는데, 이 系의 混合自由 energy는, K_(dis)를 解離定數, 그리고 X_(A₁), X_(B₁), 및 X_(AB)를 單量體 A₁, B₁, 및 2量體 AB의 mole fraction이라 할 때, ▷표 삽입◁ 원문 참조하세요 로 유도되었는데 平均會合度는 濃度에 보다는 溫度에 크게 依存함을 알았다.
임정훈,유종하,김정아 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.6
Only 6 patients with partial trisomy of the long arm of chromosome 19 (19q), caused by direct interstitial duplications, have been reported until today. Herein, we report a pediatric patient with a novel 1.13 Mb direct interstitial duplication within 19q13.32, which is the smallest fragment affected so far. A five-year old Korean boy of healthy parents presented with microcephaly, growth retardation, developmental delay, and craniofacial dysmorphism. Even though G-banded chromosome analysis at resolution of 550-band revealed normal karyotype, duplication of 1.13 Mb fragment within 19q13.32 was detected by array comparative genomichybridization. Comparing with previously reported patients with pure duplication involving 19q as a sole chromosomal abnormality,our case showed the smallest duplication segment with relatively mild degree of clinical features. Our present case might serve as the landmark case among patients with 19q duplication for genotype-phenotype correlation study and further identificationof critical region for 19q duplication abnormalities.
Poly(2-Hydroxyethyl Methacrylate-co-2-Methacryloxyethyl-1, 1-Dichloroacetate)의 합성과 물성에 관한 연구
성용길,유종하,김용주 동국대학교 자연과학연구소 1987 자연과학연구 논문집 Vol.7 No.-
생체 적합성이 좋은 친수성 methacrylate ester인 2-hydroxyethyl methacrylate (HEMA)와 dichloroacetic acid(DCA)로부터 2-methacryloxyethyl-1, 1-dichloroacetate (MEDCA)를 합성하였다. 2-Methacryloxyethyl-1, 1-dichloroacetate(MEDCA)를 개시제 a, a-azobisisobutyronitrile을 사용하여 60℃에서 라디칼중합법에 의해 poly (MEDCA)를 합성하였으며, poly(HEMA-co-MEDCA)도 같은방법으로 몰비에 따라 공중합성시켰다. 합성된 단량체 및 공중합체는 적외선 분광법과 핵자기 공명 스펙트럼을 사용하여 확인하였으며, 열적성질은 시차주사 열량계 (DSC)와 열무게 측정법 (TG)에 의해 측정하여 용융엔탈피, 용융엔트로피 및 활성화에너지 등을 구하였다. 또한 합성된 충합체들에 대한 팽윤성을 물과 알코올에 대해서 측정 조사하였다. 2-Methacryloxyethyl-1, 1-dichloroacetate(MEDCA) was synthesized from 2-hydroxyethyl methacrylate (HEMA) and dichloroacetic acid (DCA). Poly(HEMA-co-MEDCA) was synthesized by radical polymerization using a,a'-azobisisobutyronitrile(AIBN) at 60℃. The synthesized monomer and copolymer was identified by NMR and FT-IRspectrophotometer. The thermal properties of the copolymers were investigated by differential scanning calorimetry (DSC) and thermogravimetry(TG). The enthalpy, entropy, and activation energy of copolymers we re measured by DSC and TG/ The swelling properties of the copolymers in water and alcohols were also investigated.
현장검사 분석 기기인 ABL90 FLEX PLUS의 크레아티닌 분석능 평가
이승재,안효준,유종하 대한진단검사의학회 2020 Laboratory Medicine Online Vol.10 No.3
배경: 크레아티닌은 신기능 평가를 위한 중요한 도구이며 조영제 유발 신부전과 같은 급성 신기능 저하를 진단하기 위해 전혈을 이용하여 크레아티닌을 현장검사 방법으로 측정하는 방법이 활발히 사용되고 있다. 본 연구는 현장검사 장비인 ABL90 FLEX PLUS (Radiometer, Denmark)의 크레아티닌의 측정 성능을 평가하여 임상적 유용성을 알아보고자 시행되었다. 방법: ABL90 FLEX PLUS의 크레아티닌 측정 성능 평가를 위해 CLSI 지침에 따라 정밀도, 직선성, 상관성을 평가하였다. 상관성 평가는 혈청을 이용하여 측정한 Beckman Coulter AU5800 (Beckman Coulter, USA)의 결과와, 동일한 환자의 전혈을 이용하여 측정한 ABL90 FLEX PLUS의 결과를 비교하였다. 결과: 정밀도 평가 결과 총 정밀도 변이계수는 두 정도관리 물질에서 각각 0.0%, 0.8%였다. 직선성 평가 결과(측정범위 0.4-8.4 mg/dL) 회귀식을 이용하여 도출 한 결정계수(R2)가 0.9993이었다. Beckman Coulter AU5800와 상관성 비교 평가 결과, 상관계수(r)가 0.989로 도출되어 95% CI 범위 이내에 포함되었으며, 95% 일치한계 경계값은 -0.649 mg/dL (-18.8%)와 0.643 mg/dL (17.8%)였다. 결론: 현장검사 장비인 ABL90 FLEX PLUS의 크레아티닌 측정값에 대한 평가결과 정밀도, 직선성, 상관성 모두 우수하였다. 이를 바탕으로 고려할 때 ABL90 FLEX PLUS는 임상적으로 유용할 것으로 판단된다. Background: To diagnose acute renal failure, creatinine levels in whole blood are typically assessed using point-of-care testing (POCT) methods. The present study aimed to evaluate the performance of a newly developed POCT blood gas analyzer, the ABL90 FLEX PLUS (Radiometer, Denmark), which can measure creatinine in blood. Methods: Precision and linearity of the ABL90 FLEX PLUS were evaluated and compared with those of the Beckman Coulter AU5800 (Beckman Coulter, USA), according to the CLSI guidelines for creatinine measurement performance. Results: For the ABL90 FLEX PLUS, the total imprecision (%CV) levels of two control materials were measured to be 0.0% and 0.8%, while linearity was evaluated, with the R2 value measured to be 0.9993 (0.4-8.4 mg/dL). Compared to the AU5800, the ABL90 FLEX PLUS correlation coefficient (r) was found to be 0.989. The 95% limits of agreement were determined to be -0.649 and 0.643 mg/dL (-18.8% and 17.8%). Conclusions: The ABL90 FLEX PLUS exhibited good performance for creatinine test. This indicates that the ABL90 FLEX PLUS can be potentially useful in clinical laboratories.
대구 응급의료센터와 약물 중독 선택 키트를 이용한 진단테스트의 의료적인 유연성에 급성중독환자의 진단타입
이승진,임순옥,김태정,박민정,유종하 대한임상검사과학회 2013 대한임상검사과학회지(KJCLS) Vol.45 No.3
It is important to check the types of drugs when treating acute drug intoxication. This study researches the clinical characteristics and types of patients hospitalized in emergency medical center for drug addiction in 2009 and 2010. By applying a drug addiction selecting kit, it studied the flexibility and clinical efficiency during diagnosis and treatment. The study result shows, among the drugs causing addiction, Sedative accounts for 34.4%, Herdicide 23.5%, Analgesic 17.2%, Insectide 7.8% and else 17.2%. Sedative showed the highest proportion both in 2009 and 2010. Among the drug addicted patients, 39 cases did not know that the drugs are poisonous and among them, the drug addiction selecting kit was positive in 32 cases (82.0%). In 42 cases where addiction was suspicious, 25 cases (59.5%) were positive in the drug addiction selecting kit. In 57 cases of using drug addiction selecting kits, the cases in which benzodiazepine was positive, were 30 and the most frequently cases were as follows; Tricyclic Antidepressants (TCA) 13 cases, Amphetamines 3 cases, barbiturate 3 cases, and piate 3 cases. In the district using drug addiction kit meaningfully had Flumazenil injection much greater impact than the one not using the kit. This proves the efficiency of the kit (p<0.05). The uses of drug addiction selecting kits are for acute drug intoxicated patients and for providing objective and scientific information when emergency medical doctor are checking unchecked poisoning drugs. It is considered that drug addiction selecting kits would give help when treating the early stage of drug addicted patients in emergency medical treatment.