졸-겔법으로 합성된 폴리이미드/실리카 복합체의 환경적 물성에 관한 연구

박성수,홍성수,이성환,김성완,박재현,김지경,박희찬 한국환경과학회 2003 한국환경과학회지 Vol.12 No.4

Two types of polyimide/silica composite films were prepared using sol-gel method through hydrolysis and polycondensation of tetraethoxsilane(TEOS) with the polyamic acid(PAA) and end-capped PAA solution. Sample were characterized by the means of differential thermogravimetry, X-ray diffractometry, scanning electron microscopy, universal test, impedance analyzer, chemical resistance test, etc. All of the PAA/silanol solutions heat-treated at 300℃ for 6h were transformed to polyimide/silica composites. It has been demonstrated that the properties of polyimide/silica composites were affected by the amount of silica addition and the bond type existed between polyimide and silica.

폐결핵 환자 혈청에서 수용성 Interleukin 2 수용체 및 Adenosine Deaminase 활성도에 관한 연구

고정희,박성규,백상현,박찬권,박병수,안진영,최우석,박정규 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.1

Interleukin-2 (IL-2) induces T cell proliferation in an autocrine manner and provides a means by which antigen triggered T cells can be clonally expanded in vitro. During the following activation, the activity of IL-2 is mediated by specific high affinity IL-2 binding membrane receptors which are expressed shortly after activation. In this process, a 42 KD-fragment (soluble IL-2R) is continuously cleaved off and circulates as a soluble marker of T lymphocyte activation. Elevated level of soluble IL-2R has been identified in the serum of patients with malignant autoimmune and allergic disorders, systemic parasitic infection, undergoing graft versus host disease, acute or chronic lymphocytic leukemia and HIV-infection. ADA (adenosine deaminase) completes the process of differentiation of T cell and is essential for progression of T cell maturation. Therefore level of ADA is to correlated with magnitude of T cell immune response. The fact that expression of sIL-2R and ADA activity increases in peripheral blood T-lymphocytes of patients with active pulmonary tuberculosis suggests that T cell activation might have a major role in the pathogenesis of pulmonary tuberculosis. In order to evaluate the T cell immune response in pulmonary tuberculosis, we measured the serum concentration of sIL-2R and ADA activity in 17 patients with current pulmonary tuberculosis, 10 chronic inactive pulmonary tuberculosis, 10 as normal controls. (1) Current pulmonary tuberculosis had significantly higher levels of sIL-2R (237.24±95.47)when compared with those of inactive tuberculosis (78.6±11.06). and the control (68.17±15.4) group. (2) ADA activity in current pulmonary tuberculosis was significantly increased (34.41±20.63) when compared with those of inactive tuberculosis (24.7±14.36) and control (17.65± 5.94) group. (3) There was good correlation between sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group. (4) sIL-2R concentration and ADA activity was decreased significantly 6 months after anti-tuberculosis drug medication. In conclusion, sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group was increased when compared with those of inactive pulmonary tuberculosis and the control group. By the way, T cell mediated immune response was enhanced in current pulmonary tuberculosis, but in inactive chronic pulmonary tuberculosis who had treated by antituberculosis drug medication, the concentration of sIL-2R and ADA activity was nearly normal.

대량의 각혈로 사망한 장티푸스 1예

한상우,유진홍,권순석,김성훈,박지찬,홍은정,최경성,박용완,장준희,안지원,박유경,강지영,박상미,신완식 대한감염학회 2004 감염과 화학요법 Vol.36 No.5

We experienced a 25 year-old male patient with typhoid fever complicated with massive hemoptysis. Pulmonary complication in typhoid fever is very rare and to our knowledge, there has been no report of hemoptysis as a main cause of death with this disease. We herein report a rare case of typhoid fever.

다단계 수리체계의 성능평가를 위한 폐쇄형 대기행렬 네트워크 모형

박찬우,김창곤,이효성 한국경영과학회 2000 한국경영과학회지 Vol.25 No.4

In this study we consider a spares provisioning problem for repairable items in which a parts inventory system is incorporated. If a machine fails, a replacement part must be obtained at the parts inventory system before the failed machine enters the repair center. The inventory policy adopted at the parts inventory system is the (S,Q) policy. Operating times of the machine before failure, order in lead times and repair times are assumed to follow a two-stage Coxian distribution. For this system, we develop an approximation method to obtain the performance measures such as steady state probabilities of the number of machines at each station and they probability that a part will wait at the parts inventory system. For the analysis of the proposed system, we model the system as a closed queueing network and analyze it using a product-form approximation method. A recursive technique as well as an iterative procedure is used to analyze the sub-network. Numerical tests show that the approximation method provides fairly good estimation of the performance measure of interest.

國際的 人權保護와 不干涉의 原則

朴炳度,洪性讚 건국대학교 사회정책연구소 1998 사회과학연구 Vol.9 No.-

카올린으로부터 액상침전법에 의한 미립 알루미나 합성

박희찬,강효경,김병찬,박성수 釜山大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.56 No.-

카올린으로부터 미립 일루미나 분말을 합성하였다. 황산용액을 이용하여 액상침전법으로 알루미나를 추출하였다. 알루미나 추출에 미치는 황산농도, 반응온도 및 반응시간의 영향을 조사하였다. 이 과정에서 수화 황산알루미늄이 용출액으로부터 석출되었다. 이때 석출제로는 에탄올을 사용하였다. 이 석출물을 가영하여 미립 알루미나 분말을 얻을 수 있었다. DTA, SEM, TEM 및 XRD를 이용하여 분말의 특성을 조사하였다. Fine alumina was synthesized from kaolin. The alumina was prepared by liquid phase precipitation method using H?SO? solution. The effects of acid concentration, reaction temperature and reaction time on alumina extraction were investigated. Using an ethanol as precipitating agent, hydrated aluminum sulfate was precipitated from leach liquor. Fine alumina powder was obtained by calcining the precipitate. DTA, SEM, TEM and XRD were employed to characterize the powder.

한국형 후각검사 KVSS Test의 개발

홍석찬,유영석,김은서,김석천,박수홍,김진국,강성호 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.7

國際環境法에서 非政府間機構의 役割

朴炳度,洪性讚 건국대학교 사회정책연구소 1999 사회과학연구 Vol.10 No.-

마이크로파로 가열된 리튬 실리케이트계 무기고분자의 핵 생성 및 결정화에 관한 연구

박성수,박찬영,민성기 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1

A comparison of nucleation and crystallization of amorphous lithium silicate under the conventional and microwave processing was investigated. Optical microscopy(OM). X-ray diffractometry(XRD), and differential thermal analysis(DTA) were used to evaluate the results. Both conventional and microwave heat-treated samples had same nucleation temperature, 460~480℃, and same temperature of maximum nucleation rate, 580℃. From the results of DTA, the probability for the bulk crystallization increased in the microwave heat-treated samples. compared to conventional one. Degree of crystallization increased with increasing crystallization temperature in both conventional and microwave heat-treated samples. However, pattern of spherulites growth under the microwave processing appeared to be quitely different from that under the conventional one due to its internal heating.

부신피질 자극호르몬 단독결핍 1례

박경식,이승현,최석영,박태규,이동화,이찬우,정성복,이인규 啓明大學校 醫科大學 1997 계명의대학술지 Vol.16 No.3

부신피질 자극호르몬 단독결핍은 국내에서 7례만이 보고된 희귀 질환이며 병인 및 경과 등 아직 불분명한 측면이 많다. 이는 질환지체의 희귀성도 있지만 치료후 자연경과에 대한 장기적인 추적검사가 이루어진 경우가 드물기 때문이기도 하다. 저자들은 비특이적인 전신증상을 주소로 내원한 폐경기후의 56세 여자 환자에서 자가면역질환의 증거없이 고프로릭틴혈증을 보인 부신피질 자극호르몬 단독결핍 1례를 경험하고 1년간의 부신피질호르몬 대치요법후 추적검사를 실시하였기에 문헌 고찰과 함께 보고하는 바이다. Isolated ACTH deficiency is a rare disorder which shows secondary adrenal insufficiency with normal states of other pituitary hormones. A 56-year-old postmenopausal woman complaining general weakness and intermittent mental confusion presented negligible serum cortisol and ACTH level with hyperprolactinemia and mild hyponatremia. Rapid ACTH stimulation test did not show significant increase of serum cortisol level. Combined pituitary stimulation test showed negligible response of cortisol and ACTH, and slightly decreased response of prolactin and gonadotropin. But the responses of TSH and GH were normal. There was no evidence of organic pituitary of hypothalamic lesion in brain MRI and antithyroid autoantibody was not detected in serum. After receiving 12 months of glucocorticoid replacement therapy, she skipped the medicine for 3 weeks and we performed follow-up endocrinologic tests. Serum ACTH and cortisol level was also negligible and prolonged ACTH simulation test showed normal response of serum cortisol. CRF stimulation test showed no response of serum ACTH. Basal prolactin level was decreased to near normal and combined pituitary stimulation test showed normal response of prolactin with slightly blunted response of TSH and GH. We concluded that the case was nonautoimmune origined isolated ACTH deficiency which was accompanied by hyperprolactinemia and resultant deficiency of gonadotropin, so we report this case with review of literatures.