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문성록,박수경,정영표,김태요,최유선 圓光大學校 醫科學硏究所 1998 圓光醫科學 Vol.14 No.2
Background: Radiation therapy in palliative cancer management leads mainly to nausea, vomiting, dyspepsia and anorexia. Several agents have been used to treat above symptoms and sings. We assessed the usefulness of continuous intravenous infusion of low-dose droperidol, compared to granisetron for the control of gastrointestinal symptoms due to radiation therapy. Method: We devided 30 patients who developed gastrointestinal symptoms after undergoing palliative radiation therapy due to metastatic bone pain in two groups. In group G(n=15), the patients were injected granisetron(3㎎) and then injected it, 3㎎ per day. In group D(n=15), the patients were injected low-dose droperidol(0.25㎎) and then infused continuously at low-dose(1㎎/day) by the disposable continuous infusion pump. Result: There were no significant differences in the patient's satisfaction, improvement of appetite and incidences of side effects between two groups. Conclusion: The continuous intravenous infusion of low-dose droperidol can substitute for serotonin-receptor antagonist for the treatment of gastrointestinal symptoms during radiation therapy for cancer patients.
Sun Rock Choi,Junkyu Han,Huee-Youl Ye,Jonggan Hong,Won Sik Yang Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.4
This paper presents a validation study of the subchannel analysis code SLTHEN used for the core thermal-hydraulic design of the Prototype Gen-IV sodium-cooled fast reactor (PGSFR). To assess the performance of the ENERGY model of SLTHEN, four liquid metal heating experiments conducted by ORNL, WARD, and KIT with hexagonal assemblies of wire-wrapped rod bundles were analyzed. These experiments were performed with 19-and 61-pin bundles and varying power distributions of axial and radial peaking factors up to 1.4 and 3.0, respectively. The coolant subchannel temperatures measured at different axial locations were compared with the SLTHEN predictions with the Novendstern, Chiu-Rohsenow-Todreas (CRT), and Cheng-Todreas (CT) correlations for flow split and mixing in wire-wrapped pin bundles. The results showed that the SLTHEN predicts the measured subchannel temperatures reasonably well with root-mean-square errors of ~10 % and maximum errors of ~20 %. It was also observed that the CRT and CT correlations consistently outperform the Novendstern correlation.
최선락(Sun Rock Choi),김동식(Dongsik Kim),좌성훈(Sung-Hoon Choa) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In the present study, the thermal conductivity and diffusivity of a variety of thin film materials, which are commonly used in MEMS applications, are measured. The samples include Au, Sn, Mo, Al/Ti alloy, anodized alumina, SiO₂, AlN, and SiC. In the experiment, the thermal diffusivities of metallic thin films are measured by two independent methods - the AC calorimetric method and photothermal mirage technique. The thermal conductivities of dielectric thin films are measured by the 3 omega technique. The results show that the thermal transport properties of some of the films are significantly smaller than those of the same material in bulk form. Especially, the AlN and SiC thin films exhibit pronounced thermal conductivity reduction because of the size effect. The results are analyzed based on the XRD (X-Ray diffraction) and AFM (Atomic Force Microscope) measurement.
마이크로 채널 내 액체 시료의 실시간 열분석 기법 개발
최선락(Sun Rock Choi),홍종간(Jonggan Hong),김동식(Dongsik Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This work introduces a novel method for real-time measurement of the thermal conductivity and heat capacity of nanoliter-scale liquid samples. The device uses a micromachined thermal sensor composed of a microchannel and a thin-film probe. The method, based on the 3w technique, employs a multiparameter-fitting scheme to determine the thermal properties with numerical computation of heat transfer. The results demonstrate that the sensor can measure the thermal conductivity and heat capacity of 12 nl samples simultaneously. Furthermore, real-time thermal characterization of fluid samples flowing in a microchannel has been demonstrated, manifesting strong potential of the proposed technique as an in-situ probe in various microfluidic applications.
Candida albicans에 의한 피부하 농양 2예
박진선;김병훈;장영락;최우석 김진용;조용균 중앙대학교 의과대학 의과학연구소 2012 中央醫大誌 Vol.37 No.1/2
Candidal subcutaneous abscess is very rare. However, without noticing it, we can confront poor outcomes such as treatment failure, prolonged therapeutic duration, various complicated organ diseases. Furthermore, it tends to gradually increase so we have to consider about it. We present two patients with subcutaneous abscess due to Candida albicans not secondary to hematogenous or disseminated infection which is first case in Korea and we have cured successfully with surgical drainage and antifungal agent. There is no confirmative therapeutic guideline about candidal subcutaneous abscess yet, because of its rarity, but in the future, we need to concern about candidal subcutaneous abscess and establish appropriate treatment.
최선락,이주철,김동식,Choi, Sun-Rock,Lee, Joo-Chul,Kim, Dong-Sik 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.9
The mirage technique is proved to be powerful in measuring the thermal diffusivity of materials. In particular, its contactless nature makes it suitable for delicate samples and microscale structures. In this study, thermal-wave-coupling method is developed in a general form for both thermally thin and thick samples. In the suggested measuring scheme, the probe beam can be positioned close to the pump beam and the absolute position need not be measured. Therefore the new scheme provides a relatively simple yet effective way to determine the thermal diffusivity of thermally thick samples. Thermal diffusivities of bulk samples like Ni and Al were measured and the characteristics of mirage signal for a thin film were observed by using the mirage experimental setup. The apparent thermal diffusivity was measured by varying such parameters as probe beam height, size of pump beam, power of pump beam, and surface condition of sample. From the practical standpoint, it is shown that the size of the pump beam is the most important factor for accurate thermaldiffusivity measurement. Experiments using thin-film samples show that the thermal diffusivity of a substrate covered with thin film can be measured by photothermal mirage signals.