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김흥식,정진형,최명수,안정근,김상규,김종대,전주영 ( Heung Sik Kim,Jin Hyung Jeong,Myung Soo Choi,Jung Geun An,Sang Gyu Kim,Jong Dae Kim,Chu Young Chun ) 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.1
The present study was performed to improve the Environmental Impact Assessment system by comparing and analysing EIA systems for Residential Developments in the light of the business practice. For the improvement of EIA system, future strategies from each of three part ; the organ of approval(Construction&Transportation Dept.) for residential developments, the organ of consultation(Environment Dept.) for EIA and a developer(Korea Nation Housing Corp.), were analysed, and EIA systems and the processes of Residential developments were analysed. Results from the analysis of problems have provided a proposal for improvement of the Environmental Impact Assessment.
고삼추출물이 치은섬유아세포의 세포주기 조절단백질 발현에 미치는 영향
김흥식,김현아,유용욱,강태현,김윤철,김탁,피성희,유형근,신형식,Kim, Heung-Sik,Kim, Hyun-A,Yu, Yong-Ouk,Kang, Tai-Hyun,Kim, Youn-Chul,Kim, Tak,Pee, Sung-Hee,You, Hyung-Keun,Shin, Hyung-Shik 대한치주과학회 2000 Journal of Periodontal & Implant Science Vol.30 No.4
Fibroblasts are major cellular components of gingiva and periodontal ligament. They regulate the healing process after surgery or injury. Recently, many natural medicines, whose advantages are less side effects and possibility of long-term use, have been studied for their capacity, their anti-bacterial and anti-inflammatory effects and regenerative potential of periodontal tissues. Sophorae radix have been traditionally used as an anti-bacterial and antiinflammatory drug in oriental medicine. The purpose of present study was to investigate the effects of Sophorae radix extract on cell cycle progression and its molecular mechanism in human gingival fibroblasts. Sophorae radix extracts($100{\mu}g/ml$) notably increased cell proliferation and cell activity in the human gingival fibroblasts as compared to non-supplemented controls. There was an increase in the S phase and a decrease in the G1 phase in $100{\mu}g/ml$ of Sophorae radix extracts group as compared to non-supplemented controls. The level of cyclin E and cdk 2 protein in test group was higher than that of control groups. But that of cyclin D, cdk 4, and cdk 6 was not distinguished from controls. The level of p53 protein in test group was lower than that of controls, whereas that of p21 was not different. The level of pRB protein in test group was higher than that of controls, whereas that of p16 was lower. These results indicate that the increase of cell proliferation by Sophorae radix extracts may be due to the increased expression of cyclin E and cdk 2, and the decreased expression of p53 and p16 in human gingival fibroblasts.
김흥식,정진형,최명수,안정근,김상규,김종대,전주영,Kim, Heung-Sik,Jeong, Jin-Hyung,Choi, Myung-Soo,An, Jung-Geun,Kim, Sang-Gyu,Kim, Jong-Dae,Chun, Chu-Young 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.1
The present study was performed to improve the Environmental Impact Assessment system by comparing and analysing EIA systems for Residential Developments in the light of the business practice. For the improvement of EIA system, future strategies from each of three part ; the organ of approval(Construction&Transportation Dept.) for residential developments, the organ of consultation(Environment Dept.) for EIA and a developer(Korea Nation Housing Corp.), were analysed, and EIA systems and the processes of Residential developments were analysed. Results from the analysis of problems have provided a proposal for improvement of the Environmental Impact Assessment.
A Study on the Contamination of D.I. Water and its Effect on Semiconductor Device Manufacturing
김흥식,유형원,윤철,김태각,최민성,Kim, Heung-Sik,Yoo, Hyung-Won,Youn Chul,Kim, Tae-Gak,Choi, Min-Sung The Institute of Electronics and Information Engin 1993 전자공학회논문지-A Vol.30 No.11
We analyzed the D.I. water used in wet cleaning process of semiconductor device manufacturing both at the D.I. water plant and at the wafer cleaning bath to detect the impurity source of D.I. water contamination. This shows that the quantity of impurity is related to the resistivity of D.I. water, and we found that the cleanliness of the wafer surface processed in D.I. water bath was affected by the degree of the ionic impurity contamination. So we evaluated the cleaning effect as different method for Fe ion, having the best adsoptivity on wafer surface. Moreover the temperature effect of the D.I. water is investigated in case of anion in order to remove the chemical residue after wet process. In addition to the control of D.I. water resistivity, chemical analysis of impurity control in D.I. water should be included and a suitable cleaning an drinsing method needs to be investigated for a high yielding semiconductor device.
김흥식,백승욱,박준성,Kim, Heung-Sik,Baek, Seung-Wook,Park, Jun-Sung 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.10
An experimental study was conducted to investigate the interaction phenomena of droplet array combustion in ambient environment. The droplet with 1 mm in diameter was supported from an optical fiber and ignited with a hot wire. Combustion lifetimes and burning rate constants were measured for fuel of nheptane according to parameters, which were junction and suspender spacings, and array configuration. Results show that the burning process considerably depends on the initial away configuration. The d$^2$-law is found to be correct when applied to both of the droplets in away and the single droplet. For separation distance of about 5mm, there exists a critical state. So the transition from a merged flame to separated flames occurs and burning velocity is much faster than before. Combustion lifetime of the lower droplet is shorter than that of the upper droplet in the two-dimensional arrays combustion. Burning rate constants of the droplets in arrays are smaller than that of the single droplet, while they become higher as separation distance increases. Combustion lifetimes of the droplets in arrays are longer than that of the single droplet and decrease as separation distance increase. It is concluded that the array configuration and the mergedness of the flame are the most important factors governing multi-droplet combustion.
김흥식,손장열,오재응,Kim, Heung-Sik,Son, Jang-Yeol,O, Jae-Eung 한국음향학회 1987 韓國音響學會誌 Vol.6 No.3
새로운 차음성능 측정방법인 표면인텐시티법을 이용하여 실제 건축물의 현장에서 각부위별 차음성능 평가하고. 이를 종래의 음압측정방법과 은향인텐시티법 및 이론계산에 의한 결과 치 와 비교 . 검토하였다. 표면인텐시티법에 의한 건물부위의 차음성능 측정결과치는 음향인 텐시티법 및 이론계산에 의한 결과치와 잘 일치하였으며, 표면 인텐시티법은 음향인텐시티 법과 더불어 종래의 음압측정방법에 비해 측정시 주위 암소음 및 flanking transmission의 영향을 적게 받는 것으로 나타났다. This study is to propose more reliable test method in evaluating the sound insulation performance of building element in fields. This method involves the measurements of the incident acoustic intensity and transmitted surface intensity. The incident intensity is determined from measurements of the space averaged sound pressure level in source room. The transmitted surface intensity is measured directly using one microphone and one accelerometer. The results of experiments indicate that this new method makes it possible to give more reliable data than the conventional field test method. The values of trans-mission loss measured by this new method are compared favorably with those obtained using the sound intensity method and theoretical calculation(mass law).
성인성 치주염환자에서 분리한 Porphyromonas gingivalis와 Prevotella intennedia의 항생제 내성에 관한 연구
김흥식,유형근,신형식,Kim, Heung-Shik,You, Hyung-Keun,Shin, Hyung-Shik 대한치주과학회 1996 Journal of Periodontal & Implant Science Vol.26 No.3
The purpose of this study was to an in estimate the antibiotic susceptibility of P. gingivalis and P. interrnedia isolate from the subgingival plaque to adult periodontitis. Six P. gingivalis and five P. intermedia bacterial strains were tested for their susceptibility to 10 antimicrobial agents under disc diffusion method and broth dilution method. Ten patients with deep pocket(6mm) were selected for this study. They had not taken antibiotics for 6 months and no history of dental treatment for 6 months before this study. The result were as follow : 1. For antibiotic disc diffusion method, six P. gingivalis and five P. interrnedia were tested with 10 antimicrobial agents which comprised penicillin, gentamycin, clindamycin, lincomycin, ampicillin, erythromycin, tetracycline, amikacin, chloramphenicol, vancomycin. The sensitive antibiotics were tetracycline, penicillin, ampicillin, vancomycin, chloramphenicol and resisitent antibiotics were lincomycin. The other antimicrobial agents were less active. 2. From the study of determination on the minimal inhibitory concentration(MIC) by broth dilution method, the MIC of tetracycline to P. gingivalis and P. intermedia were $0.5-1.0{\mu}g/ml$, $0.5{\mu}g/ml$, that of ampicillin were $1-8{\mu}g/ml$, that of clindamycin were $1-32{\mu]g/ml$, $8-16{\mu}g/ml$, that of lincomycin were $16-32{\mu}g/ml$, $2-32{\mu}g/ml$. These data suggest that tetracycline and ampicillin may be valuable drug in the elemination of P. gingivalis and P. interrnedia from the patients with adult periodontitis.