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감염 조절용 차단막의 두께가 광중합기의 중합광에 미치는 영향
장훈상,이석련,홍성옥,류현욱,송창규,민경산 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.5
연구목적: 본 연구는 감염 조절용 차단막을 여러 겹으로 사용했을 때 광중합기의 광강도와 파장, light diffusion 등에 미치는 영향에 대해 조사하였다. 연구 재료 및 방법: 감염 조절용 차단막은 투명 랩 (크린랩)을 사용하였고 광중합기는 할로겐 광중합기 (Optilux 360)와 LED 광중합기 (Elipar FreeLight 2)를 사용하였다. 차단막을 1겹, 2겹, 4겹, 8겹으로 광중합기의 광섬유말단을 감싸고 휴대용 광강도 측정기 (Cure Rite)로 광중합기의 광강도를 측정하였다. 광중합기를 주문제작한 optical breadboard에 고정시킨 후 휴대용 spectroradiometer (CS-1000)를 이용하여 광중합기의 파장을 측정하였고, DSLR (Nikon D70s)을 이용하여 광중합기의 light diffusion을 사진 촬영하였다. 결과: 광강도 측정 결과는 차단막의 두께가 증가할수록 광강도가 유의하게 감소하였으나 할로겐 광중합기에서 1겹과 2겹 사이에는 유의차가 없었으며, 4겹 이상의 차단막을 투과할 때 광강도가 더 많이 감소하였다. 여러 겹의 차단막을 투과한 광중합기의 전체적인 파장 형태와 peak wavelength의 변화는 관찰되지 않았다. Light diffusion 사진 촬영 시, LED 광중합기에서는 차단막의 두께가 미치는 영향이 없었으나 할로겐 광중합기에서는 차단막을 4겹 사용했을 때부터 중합광이 조사되는 각도가 감소하기 시작하여 8겹 사용했을 때 통계적으로 유의하게 감소하는 것을 볼 수 있었다 (p < 0.05). 결론: 광중합형 복합레진을 광중합할 경우 감염 조절용 차단막이 찢어지는 경우를 대비하여 1겹으로 사용하기 보다는 2겹으로 사용하는 것이 환자간의 교차감염을 예방하는데 유리할 것으로 사료된다. Objectives: This study investigated the effect of infection control barrier thickness on power density, wavelength, and light diffusion of light curing units. Materials and Methods: Infection control barrier (Cleanwrap) in one-fold, two-fold, four-fold, and eightfold, and a halogen light curing unit (Optilux 360) and a light emitting diode (LED) light curing unit (Elipar FreeLight 2) were used in this study. Power density of light curing units with infection control barriers covering the fiberoptic bundle was measured with a hand held dental radiometer (Cure Rite). Wavelength of light curing units fixed on a custom made optical breadboard was measured with a portable spectroradiometer (CS-1000). Light diffusion of light curing units was photographed with DSLR (Nikon D70s) as above. Results: Power density decreased significantly as the layer thickness of the infection control barrier increased, except the one-fold and two-fold in halogen light curing unit. Especially, when the barrier was four-fold and more in the halogen light curing unit, the decrease of power density was more prominent. The wavelength of light curing units was not affected by the barriers and almost no change was detected in the peak wavelength. Light diffusion of LED light curing unit was not affected by barriers, however, halogen light curing unit showed decrease in light diffusion angle when the barrier was four-fold and statistically different decrease when the barrier was eight-fold (p < 0.05). Conclusions: It could be assumed that the infection control barriers should be used as two-fold rather than one-fold to prevent tearing of the barriers and subsequent cross contamination between the patients.
윤기도,권동진,홍석산,김수일,정건섭 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.4
To investigate the inhibitory effect of soybean and Korean traditional fermented soybean products on the chemically induced mutagenesis, we extracted soybean, Kanjang, Doenjang, Kochujang, and Chonkukjang with water, methanol and hexane. Inhibitory effect of extracts was assayed by the SOS chromotest using Escherichia coli PQ37 as a test strain. 4-nitroquinoline-1-oxide(4NQO), N-methyl-N'-nitro-N-nitrosoguanidine(MNNG), and aflatoxin B_1(AFB_1) were used as mutagens. Methanol extracts showed relatively higher inhibitory effect than water and hexane extracts. Methanol extracts of soybea, Doenjang, Kochujang, and Chongkukjang showed inhibitory effect of 68.4, 96.3, 17.5, and 100.9%, against MNNG, and 28.6, 109.1, 41.3, and 101.8% against AFB_1., respectively. Doenjang methanol extract showed inhibitory effect of 51.0, 96.3, and 109.1% against 4NQO, MNNG, and AFB_1. Inhibitory effect of heat-treated Doenjang and Chongkukjang methanol extracts on the mutagenicity of MNNG and AFB_1 was remained over 95% of the inhibitory effect of heat-untreated extracts, demonstrating the heat stability of the potent antimutagenic activity.
정도영,이상호,서진우,오홍석,최경호 三陟大學校 1997 論文集 Vol.30 No.1
The switched reluctance motor(SRM) has a simple rotor construction with no windings. It also has simple concentrated windings on the stator. Thus, it is expected to be a lower cost machine to manufacture than the squirrel cage induction motor. This paper presents an advanced rotor structure type, well-round rotor type in SRM. To design the improved SRM we have used FEM and studied and compared with each other. The static torque, instantaneous torque and average torque are more improved than that of typical rotor type which has been a lot of used for SRM.
Hong, Seok-San,Cha, Seong-Kwan,Kim, Wang-June,Koo, Young-Jo The Korean Society for Microbiology and Biotechnol 1996 Journal of microbiology and biotechnology Vol.6 No.1
A cultured milk product was made by fennenting 10$\%$ reconstituted skim milk with Lactococcus lactis subsp. lactis TA29 and Saccharomyces exiguus SK2. L. lactis TA29 and S. exiguus SK2 grew up to 1.0 $\times 10^9\;and\;2.0 \times 10^6$ cfu/ml, respectively. After the fermentation 21$\%$ of lactose was hydrolyzed, pH was lowered to 4.2, and titratable acidity and alcohol concentration were increased to 0.96 and 0.023$\%$, respectively. When the fermented milk was stored at $4{\circ}C$ for 9 days, the viable cell counts for L. lactis TA29 and S. exiguus SK2 were $6.5 \times 10^5\;and\;1.6 \times 10^6$ cfu/rnl, respectively. The alcoholic fermented milk prepared in this experiment was more inhibitory against some pathogenic bacteria including C. perfringens than commercial yoghurt products tested.
Growth of Spirulina platensis in Effluents from Wastewater Treatment Plant of Pig Farm
Hong, Seok San,Lee, Nam Hyung 한국미생물 · 생명공학회 1993 Journal of microbiology and biotechnology Vol.3 No.1
Spirulina platensis NIES 39 was grown in effluents from a wastewater treatment plant utilizing activated sludge process at a pig farm to reduce pollutants and to produce feed resources. The addition of 2g/ℓ NaCl was required for the growth of S. platensis in the effluents with about 100㎎/ℓ ammonia nitrogen concentration. The growth was stimulated by the addition of 2 g/ℓ sodium bicarbonate and 4㎎/ℓ ferrous sulfate. The microorganism grew well at pH 8∼11, and the optimum pH for the growth was 10. The algal concentration of 1.1g/ℓ was attained after 8 days of growth at the optimum condition with the removal of 95% ammonia nitrogen and 34% phosphorus.
가미통성산(加味通聖散)이 자발성 고혈압 흰쥐에 미치는 영향
최은희,임대웅,정태산,안가영,천혜선,전상윤,홍석,Choi, Eun-Hee,Lim, Dae-Woong,Jung, Tae-San,An, Ga-Yong,Chun, Hea-Sun,Jeon, Sang-Yun,Hong, Seok 대한한방내과학회 2010 大韓韓方內科學會誌 Vol.31 No.3
Objective : This study was examined to investigate the effect of Gamitongseong-san(GTS) extract on spontaneous hypertension. Methods : After administering GTS extract to SHR for 4 weeks, we measured anti-oxygen effects, weight of body, heart and kidney, blood pressure, heart rate, aldosterone, catecholamine, electrolyte, uric acid, and BUN. Results : 1. GTS increased 2,2-diphenyl-1-picrylhydrazyl(DPPH) scavenging activity and superoxide dismutase(SOD) similar activity depending on the concentration. 2. GTS significantly decreased heart weight in spontaneously hypertensive rat. 3. GTS significantly decreased blood pressure and heart rate in SHR. 4. GTS significantly decreased aldosterone. 5. GTS significantly decreased norepinephrine and epinephrine. 6. GTS significantly decreased $K^+$. 7. GTS significantly decreased BUN. Conclusions : These results suggest that GTS may be usefully applied for the treatment of hypertension.