나프틸기를 포함하는 퓨록산 유도체의 합성

黃匡鎭,南賢祐 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-

Furoxan derivatives containing naphthyl group was designed and synthesised as pohtochemical nitric oxide precussor. Naphthyl furoxan 4 was prepared by the [2+3] cycloaddition of the nitrile oxide generated in situ from the iminoyl chloride 3. The preparation of iminoyl chloride 3 was proceeded from naphthyl aldehyde 1 by the reaction with N-chlorosuccinimide following oxime formation. Naphthyl furoxan 4 was irradiated on 300 nm in CH2Cl2 to give alkyne 5 confirming NO generation.

치은연하 파절로 치조골 소실을 동반한 상악측절치에서 orthodontic extrusive remodeling후 임플란트 식립을 통한 심미수복 : 증례보고

황수연,손원준,한영철,배광식,백승호,이우철,금기연 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.1

심미적으로 중요한 전치부에서 단일 치아 임플란트를 이용한 보철수복은 임상의에게 새로운 도전과제 중의 하나가 되었다. 그러나 전치부에서 single-unit implant는 식립할 부위의 치조골 상태가 양호해야 하는데 치은연하 파절로 인해 치아 주위에 골 손실이 있는 경우 immediate implant는 심미적으로 문제를 야기할 수 있다. 따라서 본 증례는 "orthodontic extrusive remodeling"을 통해 파절치와 주위 조직을 교정적으로 정출시켜 임플란트 식립을 위한 연조직과 경조직을 증대시킨 후 임플란트 식립을 통해 상악측절치에서 성공적인 심미수복을 이룬 증례에 관한 것이다. The treatment of esthetic areas with single-tooth implants represents a new challenge for the clinician. In 1993, a modification of the forced eruption technique, called "orthodontic extrusive remodelling" was proposed as a way to augment both soft- and hard-tissue profiles at potential implant sites. This case report describes augmentation of the coronal soft and hard tissues around a fractured maxillary lateral incisor associated with alveolar bone loss, which was achieved by forced orthodontic extrusion before implant placement. Through these procedures we could reconstruct esthetics and function in a hopeless tooth diagnosed with subgingival root fracture by trauma.

RS485 직렬 통신 인터페이스를 이용한 BLDC 서보 전동기의 안전운전 영역에서의 운전에 관한 연구

우광준,김장기,황규범 단국대학교 1999 論文集 Vol.34 No.-

The servo motor systems is widely applied to the position and speed control system in modern process automation. In this paper, we design the H/W interface including RS232/485 converter and the control S/W interface including RS485 communication protocol for the real time operation of BLDC servo motor using half duplex asynchronous serial communication interface(ASCI). We confirm the servo operation for servo motor system in safety operation region by monitoring the servo status from the reply data of communication protocol and the possibility of real time operation in servo motor system using DIO method as well as ASCI method by the experimental results of proposed scheme.

구강 악성 흑색종에서 PCNA 발현에 관한 면역조직화학적 연구

황경균,남윤우,이재일,이종호,심광섭,김명진 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.6

Malignant melanoma arising from the mucosa of head and neck region was rare and showed poor prognosis. Some of malignant melanoma were transformed from benign melanotic lesion. Malignant melanoma had high cellular proliferation and rapid growth. The percentage of PCNA-positive cell (labeling index) is high in many malignant tumor. So we compared the pattern of PCNA expression in the melanotic lesion. We performed the immunohistochemical study in malignant melanoma(19 cases), benign melanotic macule(24 cases) and normal mucosa(20 cases) were diagnosed in Seoul National University Dental Hospital between 1980 and 2000. Positive PCNA staining was found mainly in malignant melanoma. The mean PCNA expression in malignant melanoma, melanotic macule, normal tissue were 29.2%, 1.4%, 0%, respectively. Significant differences in PCNA expression were noted between malignant melanoma and melanotic macule(p<0.01), normal mucosa(p<0.01). These result suggested that the PCNA expression seems to be used as a diagnostic indicator for malignancy in malignant melanoma and melanotic lesion.

니트로크라이센 유도체의 합성에 관한 연구

黃匡鎭,김진국,남현우 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-

In an attempt to provide a useful light-emitting material in the organic electroluminescence diode, nitrochrysene 5 was prepared by the nitration of the tetrahydrochrysene 4 using dinitrogen tetraoxide as a key step. The chrysene 4 was obtained from the methyl cinnamate in 3 steps. The mono-nitration was confirmed by the IR, ^1H-NMR and ^13C-NMR spectra of chrysene 5. The results suggest that the synthetic methods for the nitrochrysene 5 is applicable to the synthesis of various chrysene derivatives containing donor-acceptor groups at 2, 8-positions.

낙동강 수계의 인, 질소 및 Chl.a 농도 분포 : The distributions of phosphorus, nitrogen, and chlorophyll a concentration in the Nakdong River

허우명,김범철,황길순,최광순,박원규 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-

The longitudinal variations of water quality along the mainstream of the Nak-ding River from May 1994 to October was surveyed by the measurement of chl-orophyll a, total phosphorus, total nitrogen, dissolved inorganic phosphorus, nitrate-nitrogen, ammonia-nitrogen concentration, and secchi disc transparancy. Chl. a, TP, TN, DIP, NO_(3) and NH_(3)-N concentration was maintained at high level during the investigation period. And they also showed the peak after the input of Kumho River. Chl. a concentration was increased from 14.2㎎/㎥ in May to 95.2 in October. TP ane TN concentration was maintained always above 100㎎/㎥ and 3~4㎎N/l, respectively. TN/TP ratio were less than 16 from June to September with a few exceptions. Therefore, nitrogen is the limit-ing nutrient in the Nakdong River. Trophic states were in the range of eutrophic to hypertrophic, from 60 to80.

방전관용 전극개발 및 특성에 관한 연구

안성환,황동원,최준영,송시준,전용우,박원주,이광식 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1

This paper describes the development of sputtered tungsten electrode for discharge tube by making use of Sputtering method using plasma. The Xe discharge tube was designed and fabricated by using sputtered tungsten electrode, and the ICCD(Intensified Charged Coupled Device) and monochromator were used in order to observe the discharge image distribution and to measure the signal intensity. As a result, the emission light form the electrode was spreaded almost uniformly over a wide wavelength band, and the discharge image distribution and the signal intensity show quite a uniform distribution. The emission light from the Xe discharge tube was peaked at 488[nm] and 648[nm].

자일리톨, 후노란, 제2인산칼슘 및 카제인포스포펩타이드배합껌이 법랑질의 광질재침착에 미치는 영향에 관한 실용실험연구

이병진,배광학,박우철,양준영,황수정,노정,백대일,김종배 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.4

The object of this study was to investigate caries preventive effect of chewing gum containing xylitol, funoran, calcium hydrogen phosphate and casein phosphopeptide by examining Vickers' hardness and surface roughness with confocal laser microscope. Early caries-like lesions were created using 0.1 M lactic acid-sodium hydroxide buffer(pH 4.0). 8 pieces of 3am diameter bovine enamel specimen with early caries-like lesions were mounted into the recesses of lingual surface of the acrylic mandibular removable appliance. 13 subjects were the appliance for daytime and chewed control and experimental gums 7 times in a day, for 3 days. In order to evaluate the remineralization effect of chewing gum on specimens, we measured vickers' hardness number after chewing gum, 1 day, 2 days, 3 days after and calculated surface roughness immediately after chewing gum. Vickers' hardness number of experimental chewing gum was significantly higher than control in 2 and 3 days after. Surface roughness of experimental chewing gum was significantly lower than control immediately after chewing gum. These results showed that experimental gum has more effective in remineralization of bovine tooth enamel, and it is more effective at immediately after chewing.

원자력 사고후 쌀알과 배추내 ^90Sr 및 ^137Cs 농도 예측

최용호,임광묵,황원태,이한수,이창우 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.3

원자력 사고후 시간경과에 따른 작물체내 핵종 농도를 보다 현실적으로 예측할 수 있는 방법을 수립하고 단위 건침적에 대하여 백미와 배추내 ^90Sr 및 ^137Cs의 50 년간 농도를 예측하였다. 비생육기 사고의 경우 농도는 두 핵종 모두 시간경과에 따라 서서히 감소하였고 50년 내내 ^90Sr이 ^137Cs보다 높았다. 생육기 사고의 경우 처음 1년간 농도는 비생육기 사고에 비해 대체로 ^90Sr은 최고 30 배, ^137Cs은 최고 1,000 배 정도까지 높았다. 50 년간의 누적농도는 백미에서는 비 생육기 사고의 경우 ^90Sr이, 생육기 사고의 경우 ^137Cs이 더 높았으나 배추에서는 어느 경우에나 ^90Sr이 더 높았다. 생육기 사고시 50년간의 누적농도에 대한 지배적 경로는 대체로 ^90Sr의 경우 뿌리흡수, ^137Cs의 경우 작물체 직접오염이었다. 재부유의 영향은 무시할 수 있을 정도였다. 예측 결과에 입각하여 사고 조건별로 대책의 방향을 제시하였다. A method of more realistically predicting radionuclide concentrations in crop plants varying with time after a nuclear accident was established to estimate 50 years' concentrations of ^90Sr and ^137Cs in polished rice seeds and Chinese cabbage for unit dry deposition. After non-growing season accidents, concentrations of both nuclides decreased gradually with time and ^90Sr concentrations were higher than those of ^137Cs throughout the whole period. Radionuclide concentrations in the 1st year after growing season accidents were on the whole higher than those after non-growing season accidents by factors of up to 30 for ^90Sr and up to 1,000 for ^137Cs. In polished rice seeds, the 50 years-integrated concentration was higher for ^90Sr than for ^137Cs after non-growing season accidents, whereas the opposite was true after growing season accidents. In Chinese cabbage, however, it was higher for ^90Sr than for ^137Cs after both types of the accident. Generally speaking, the dominant pathway for the integrated concentration after the growing season accident was root uptake for ^90Sr and direct plant contamination for ^137Cs. The effect of resuspension was negligible. Based on the predicted results, the direction of planning countermeasures was suggested for various accident conditions.

소양호에서 인의 존개 형태별 분포에 관하여 : The Distribution of Phosphorus Fractions in Lake Soyang

김범철,허우명,황길순,김동섭,최광순 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-

The distribution of phosphorus in Lake Soyang from January 1985 to August 1992 was surveyed by the measurement of soluble reactive phosphorus(SRP), total dissolved phosphorus(DTP), and total phosphorus(TP) concentration. SRP concentration was in the range of 2~7㎎/㎥ in epilimnion, and 4~200㎎P/㎥ in hypolimnion. The vertical distribution pattern of SRP showed a large difference with the season. SRP concentration decereased during the growing season of phytoplankton in the epilimnion of Lake Soyang and increased in hypolimnion during the oxygen depletion. Higher concentration near the bottom implies they are diffused from the bottom sediment where organic particles are settled and degraded. SRP, DOP, POP and TP concentration was higher in the meralimnion of Lake Soyang in rainy season It might be related with storm runoff. General trend of TP variation is that the TP concentration of water column is increasing substantially from yeat to year. TP concentration in the surface water increased from 5㎎P/㎥ at 1985 to 20㎎P/㎥ at 1992.