(±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo [b,d] pyran-9(8H)-one의 염소화 반응에 관한 연구

홍기운,육찬남,백승화 圓光大學校 1991 論文集 Vol.25 No.2

(±)-6a, Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b,d] pyran-9[8H]-one의 염소화 반응은 metal halide와 함께 18-crown-6존재하에m-chloroperbenzoic acid에 의해 산화반응이 일어났다. 이 반응계에서는 염소화 반응이 방향족 고리에만 선택적으로 일어났다. (±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo [b, d]pyran-9(8H)-one has been chlorinated in the aromatic ring with metal halide in the presence of 18-crown-6 on oxidation with m-chloroperbenzoic acid. This reagent system effects the regiospecific chlorination of activated aromatic ring over olefinic double bond.

수술실 손 소독제의 종류에 따른 균주 수의 변화

홍성윤,김정민,김소영,이수정,오은실,양서인,김화실,김남초 병원간호사회 2006 임상간호연구 Vol.11 No.2

Purpose: The present study purposed to compare the hand washing effect of 7.5% powidone-iodine, which is used in the operation room of C university hospital in Seoul, with that of Ethyl alcohol-CHG mixture recommended by the US Association of Operating Room Nurses (2002) and to adopt a more effective hand disinfectant. Method: In a quasi-experimental design, 48 medical staff who participated in operations during the period from November 2004 to February 2005 had hand washing using the two kinds of hand disinfectants: 7.5% povidone-iodine and the ethyl alcohol-CHG mixture. Their palms were swabbed and cultured just after hand washing and again after taking dff sterile gloves after the operation. The number of colonies from the two occasions were counted and compared. Result: The number of general bacillus increased significantly in the group using 7.5% povidone-iodine compared to that in the group using the ethyl alcohol-CHG mixture. The number of general bacillus increased signficantly in doctors compared to that in nurses. The factors affecting the increase of the number of general bacillus were disinfectants and medical personnel. The number of general bacillus was expected to increase 9.41 times with 7.5% povidone-iodine than with the ethyl alcohol-CHG mixture and 14.87 times in doctors than in nurses. Conclusion: This study shows that the ethyl alcogol-CHG mixture has a stronger hand disinfection effect than 7.5% povidone iodine. Thus we need to change the hand disinfectant used in operating rooms as soon as possible in order to minimize the infection of wounds resulting from operations.

앉은 자세에 따른 등근육 근전도 해석

洪性燦,柳宗賢,白承殷,白承和 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

Today, many people stay lot of time sitting on chair in their life. If a sitting posture is not correct, there is some trouble with the waist. And if it goes on long time, sometimes it cause the hurts of waist or the deformded spinal column. A crouched posture is an obstacle to breath and it give rise to drowsiness because the lack of oxygen. Sitting posture is a habit so people can't feel it oneself and look over some kind of risks. It analyzes a condition of muscles by measuring EMG of spinal both side of spinal-bones. It can have a right sitting posture by the analyzing that increasing of muscles tention in one or the other side of muscles when the posture inclines on one side or ahead.

쾌속조형용 재료의 이방성과 강도에 대한 연구 - FDM

김승화,이홍경,이재일,안성훈 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-

Rapid Prototyping (RP) technology has been advanced to fabricate initial prototy various materials. Stratasys Fused Deposition Modeling (FDM) is one of the typical RP that provide functional prototypes of ABS plastic. In order to predict the behavior of parts, it is critical to understand the material properties of the raw FDM process mat the effect that FDM build parameters have on the FDM part. In this paper, we characterize the properties of ABS parts fabricated by the FDM 1650. Using the I Experiment (DOE) approach, the process parameters of FDM, such as raster orientatior bead width, color, and model temperature were examined. Tensile strengths of specimens, [45/-45], cross specimens, [0/90], and directionally fabricated tensile special and [90]) were measured and compared with the injection molded FDM-ABS P400 mat the FDM parts made with a 0.003 air gap, the typical tensile strength ranged be percent and 83 percent of the strength of injection molded ABS P4OO. From the expert couple of build rules for designing FDM parts were obtained.

AWRR 셀 스케쥴링 알고리즘

신승수,신동화,지홍일,최승권,조용환 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.1

The Binary Scheduling Wheel(BSW) algorithm was proposed to carry on manage buffer efficiently at implementing of WRR scheduler. But, BSW algorithm cause serous performance degradation of cell delay and maximum queue length because it allocates more weight than the weight allocated actually in VC and could not serve cell if the VC queue is empty. In this paper, we propose new BSW of the old BSW structure. Also, we develop a cell scheduling algorithm which is suitable for the new BSW structure. The proposed BSW structure and the developed algorithm are capable of maintaining the allocated weight of each VC correctly, and decrease average cell delay and average buffer length by serving other VC cell when the selected VC queue is empty, and increase cell service ratio as a whole. The evaluation results show that the proposed structure can implement WRR algorithm more efficiently than the old BSW.

(±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b, d] Pyran-9(8H)-one의 염소화 반응에 관한 연구

백승화,홍기운,육찬남 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3

(±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b, d] pyran-9[8H]-one 의 염소화 반응은 metal halide와 함께 18-crown-6존재하에 m-chloroperbenzoic acid에 의해 산화반응이 일어났다. 이 반응계에서는 염소화 반응이 방향족 고리에만 선택적으로 일어났다. (±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b, d] pyran-9[8H]-one has been chlorinated in the aromatic ring with metal halide in the presence of 18-crown-6 on oxidation with m-chloroperbenzoic acid. This reagent system effects the regiospecific chlorination of activated aromatic ring over olefinic double bond.

나주지역 문화관광자원 활성화에 관한 연구

최윤홍,나승화 한국문화관광학회 2000 문화관광연구 Vol.2 No.1

The tourist trade of Naju city in its present condition shows Naju's lack of interest as a central tourist attraction since 1997. In 1998 the tourist rate began to increase because of the interest in Naju's historical temples and the Bannam's tombs. This indicates the growing concern for cultural assets and national treasures in this area. The purpose of this research is to develop Naju's cultural tourist trade and establish an image of Naju as a historical tourism city. The development of cultural tourism resources should produce on a commercial scale tangible cultural assets to improve the historical sites and increase the tourist trade as well as to preserve the historical areas. In order to fulfill these tasks, it is necessary to develop cultural resources and assets to maintain all historical areas such as fortress, pavilions, temples and tombs, and utilize local temples as spiritual, moral and cultural foundations.

유백피 메탄올 추출물에 의한 Melanin 합성 조절

정승일,김춘관,전병훈,백승화,우원홍,천현자 대한동의병리학회 2001 동의생리병리학회지 Vol.15 No.5

Melanogenesis is a physiological process resulted in the synthesis of melanin pigments, which have a role in protecting skin from the damaging effect of ultra-violet(UV) radiation. The main aim of the present study was to examine the effect of Ulmus davidiana var. japonica on melanogenesis. Cells were cultured in the presence of methanol extracts from Ulmus davidiana var. japonica for 48 h, and there were estimated total melanin content as a final product and activity of tyrosinase, a key enzyme, in melanogenesis. Methanol extracts of the bark Ulmus davidiana var. japonica increased tyrosinase activity and melanin contents in a dose-dependent manner. Especially, It was observed that only 100 μg/ml methanol extract stimulates melanin secretion in B16/F10 melanoma cells by 140% at 48 h treatment and activity of tyrosinase increased by 250 % in the presence of same concentration.

장기투석을 받은 만성 신부전 환자에서 발생한 종양에 관한 고찰

황정화,이혜경,홍현숙,박재성,김대호,권귀향,최득린,황승덕,이희발 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2

The authors tried to evaluate tumor occurrence in long-term dialysis patients with chronic renal failure. Among 359 patients, 20 patients (about 5.6%) were diagnosed with malignancy during long-term dialysis from the period of 1983 to 1995 at our nephrology department. The ultrasonographic and computed tomographic findings including the clinical features of 20 patients that were retrospectively reviewed. The mean age of the patients was 53 (37-75)years old and the ratio of male to female was 9:1. Among the 20 cases, 7 cases of hepatoma (35%) were developed. Among them, urinary tract tumors such as renal and bladder cancer were developed in 4 (20%) and 2 (10%) of the cases. Other malignant tumors were lymphoma, stomach cancer, uterine cervical cancer, cholangiocarcinoma, lung cancer, meningioma, and acoustic neuroma one case of each (each of 5.3%). The most common tumor in patients with chronic renal failure, who were receiving long-term dialysis, was hepatoma and the second most common tumor was cancer of the urinary tract such as kidney and bladder.

난황낭종 환자에서 보존적 수술 및 항암 화학요법 후 성공적인 자연임신

정은환, 홍승화, 박연진, 지일운, 김학순 충북대학교 의과대학 충북대학교 의학연구소 2012 忠北醫大學術誌 Vol.22 No.1

침윤성 난소암의 경우 생식력의 보존이 중요한 도전이라고 할 수 있다. 20대 중반의 여성에서 거대 한 난황낭종이 발견되어 생식력의 보존을 위해 보존적 수술과 복합항암화학요법을 시행한 후 임신 및 출산에 성공한 증례를 경험하였기에 문헌고찰과 함께 보고한다.