연속식 오존처리공정을 이용한 낙동강 상수원수의 정수처리 효과

임영성,강관호,이홍재,서동철,박문수,허종수,조주식 한국환경농학회 2002 한국환경농학회지 Vol.21 No.3

낙동강 상수원수를 대상으로 연속적 오존처리에서 오존주업농도에 따른 유기물 분해 특성을 조사하기 위하여 오존처리에 의한 DOC성분변화, UV254/DOC의 변화와 소비오존에 따른 DOC 제거효율을 조사한 결과는 다음과 같다. 유입원수의 수질변화에 따라 다소 차이는 있었으나 전반적으로 오존주입농도가 증가할수록 DOC 처리효율도 증가되었다. 오존처리에 따른 DOC 성분변화는 전오존을 3 mg/L농도로 처리시 TDOC, ADOC, A&BDOC 및 NRDOC는 각각0.6, 0.2, 0.1 및 1.0 mg/L 정도 오존처리에 의하여 감소되었으나 BDOC는 0.8 mg/L 증가하였다. UV254/DOC의 분율은 오존주입농도를 1, 3 및 5 mg/L 처리하였을 때 전오존의 경우는 각각 0.048, 0.044 및 0.037 이였고, 후오존의 경우는 각각 0.018, 0.015 및 0.012로 나타나 오존주입농도가 증가할수록 감소하는 경향을 보였다. 초기 DOC mg당 소비되는 오존량에 대한 DOC 제거율은 전오존과 후오존처리의 초기 DOC에 대한 소비오존량이 각각 약 1.5와 2.3일 때 각자 25%와 32%로서 최대의 DOC 처리효율을 나타내었다. 낙동강 상수원수에 전오존을 처리할 경우 오존주입량은 초기 DOC mg당 소비된 오존이 1.5 mg 이내의 농도가 되도록 주입하고, 후오존은 유입수인 모래여과수의 초기 DOC mg당 소비된 오존이 2.3 mg이내의 농도가 되도록 조절하여 주입하면 적당할 것으로 생각되었다. This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using ozonation process. For raw water. Nakdong River was used. By conducting continuous ozonation experiments, the following results were obtained. Efficiency of water treatment was enhanced with increase in ozone dosage. When ozone dosage of 3 mg/L was used, preozonation of raw water reduced TDOC, ADOC, A&BDOC and NRDOC as much as 0.6 mg/L, 0.2 mg/L, 0.1 mg/L and 1.0 mg/L, respectively. On the other hand, content of BDOC Increased at the level of 0.8 mg/L. Ratio of UV254 absorbance to DOC content by the preozonation with 1, 3 and 5 mg/L dosage were 0.048, 0.044 and 0.037, respectively. In case of postozonation, it were 0.018, 0.015 and 0.012, respectively. When the ratios of consumpted ozone content to 1 mg of initial DOC were 1.5 and 2.3 in preozonation and postozonation treatment, respectively, the highest DOC removal rates of 25% and 32% were obtained by the continuous ozonation.

활성탄을 이용한 낙동강 상수원수의 수처리 효과

임영성,강관호,이홍재,서동철,허종수,손보균,조주식 한국환경농학회 2002 한국환경농학회지 Vol.21 No.3

상수원수를 보다 효과적으로 처리함으로서 양질의 수돗물을 공급하기 위한 기초자료를 얻고자 낙동강 상수원수를 대상으로 활성탄처리에 의한 공탐체류시간 및 활성탄 여층 깊이에 따른 수처리 효율과 생물활성탄으로서의 이용 가능성을 조사한 결과는 다음과 같다. 공탑체류시간(EBCT)에 따른 수처리 효율은 EBCT가 증가할수록 증가되었으나 운전시간이 경과함에 따라 활성탄 흡착능력은 감소되어 처리효율도 서서히 감소하였다. 활성탄 여층깊이에 따른 pH 변화는 활성탄 층 깊이에 따라 거의 없었으며, D0는 활성탄 층 깊이가 깊을수록 서서히 감소하였다. KMnO^4 소비량, UV254 흡광물질 DOC 및 THMFP 처리효율은 활성만 표층으로부터 하부로 내려갈수록 증가하였으며, 운전시간이 경과할수록 활성탄 상층부에 형성되어 있던 흡착대파 하부로 이동하였다. DOC의 상당 부분이 활성탄여과지에 서식하는 미생물 작용에 의해 분해 제거되는 것으로 나타났으며, 운전개시 126일 후의 BAC에서 활성탄 표층으로 부터깊이 20 cm 부근에 미생물이 1.1*10^7 cell/cm^3 이상 존재하는 것으로 관찰되어 생물활성탄 조건을 만족시키고 있었다. This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using mated carbon process. For raw water, Nakdong river was used. From the activated carbon adsorption experiment, the following results were obtained. The efficiency of water treatment enhanced with increase in empty bed contact time. Variation of pH was not detected to the bed depth, but DO content gradually decreased with the bed depth, Removal efficiency of KMnO₄ consumption, UV254 absorption, DOC and THMFP also were increased by increasing in the bed depth. Transition of adsorption zone from upper parts of the bed to the lower parts were detected as treatment periods increased. Large portion of DOCs were degraded and removed by the microbes growing on the surface of activated carbons. Cell numbers of microbes were estimated over 1.1 × 10 exp(7) cell/㎤ at the depth of 20 ㎝ from the surface 126 days after starting operation. The results shown that the activated carbon filter was successfully acted as a biofilm filter.

TiN 박막 형성에 미치는 ion beam 조사 효과

안병건,추관식,문두수,안정식,김영대,김형자,이규용 釜慶大學校 2002 釜慶大學校 論文集 Vol.7 No.-

Low energy high current N_2 ion beam was used to modify the morphology and chemical composition of cemented carbide WC-Co(Co:10 wt%, TiC + TaC:15 wt%, WC:bal) hard material surface for the fabrication of the TiN thin film by sol-gel method. The effects of ion beam treatment on preparation of the TiN thin film by sol-gel mothod were investigated by XPS, SEM, AFM and GXRD. According to the N_2 ion beam bombardment, the surface roughness was increased and TiC binders in WC were dissolved. The dissolved Ti was recombind with nitrogen ion to form the TiN nucleuses which were acted as seeds for the forming of the TiN thin film on the cemented WC-Co surface. Besides, the sputter deposited Ti interlayer prevented the diffusion of TiO_2 sol into the porous WC-Co during the formation of TiN thin film.

Mineralization of Bone and Osteocalcin Gene Expression

Kim, Gwan Sik The Official Publication of Korean Academy of Oral 1993 International Journal of Oral Biology Vol.17 No.2

Several lines of investigation suggest that osteocalcin, a bone-specific small peptide elaborated by osteoblasts may play a role in bone formation, resorption and turnover. To provide some informations regarding the biological function of osteocalcin with respect to mineralization, a culture system for in vitro mineralization has been established initially. Then expression pattern of osteocalcin in cultured osteoblastic cells with varying degree of mineralization and in calvaria at different stage of development were examined by RNA blot hybridization. During in vitro mineralization, osteocalcin transcripts expression was detectable at the period of matrix mineralization and its level was elevated considerably as mineralization was increased. Temporal profile of osteocalcin expression in developing calvaria was concurrent with expected onset of mineralization. These findings demonstrated that osteocalcin expression is closely related to mineralization though it remains to be determined whether it has a direct role or merely represents a differentiation-specific molecule during mineralization.

화살 , 남천 , 차 , 초피나무 4유용수종의 종자 발아촉진처리가 포지발아와 (圃地發芽) 유묘 (幼苗) 생장에 미치는 효과

구관효(Gwan Hyo Goo),최재식(Jai Sik Choi),윤기식(Ki Sik Youn) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.1

We examined the effects of seed treatment on field germination rate and seedling growth for four woody species, Euonymus alatus, Thea sinensis, Zanthoxylum piperitum, Nandina domestia which are economically useful in Korea. The seeds of each species were purified carefully after collection during Oct. and Nov.. E. alatus, T. sinensis, and Z. piperitum were sowed in the experimental field after stored in open ground with treatment of Pon-Pon. H₂O₂. GA₃, scarification. and N. domestica was sowed in container within green house after treatment of three different periods(7, 15, 21days) in growth chamber(4, 25, 32℃). Germination rate and seedling growth were measured in mid-Oct.. In E. alatus germination rate was higher in storaging in open ground after soaking in GA₃(67.1%) than in only storaging in open ground(18.4%). But the rate in T. sinenszs showed no differences between storage in open ground after treatment of GA₃, and scarification. and only storage in open ground, Germination rate of Z. piperitum was much higher in storaging in open ground after treatment of Pon-Pon(80.3%) than in only storaging in open ground(12.4%). In N. domestica. seeds stored for 7 days at 32℃ were germinated faster than those stored for 7 days at 4℃, and germination rate of the former was also higher than that of the latter. Peak Times of seed germination in field were order of E. alatus (32 days). Z. piperitum (49 days). T. sinensis (83 days), N. domestica (87 days). The growth of seedling germinated in field showed a good result because of early germination following the effect of seed treatment. The periods of highest growth performances of the seedlings were 72 days in late Jun.-mid Jul. in E. alatus. 59 days in late Jun.- mid Jul. in Z. Piperitum, and 45 days in mid Aug.- mid Sep. in T. sirtensis

루브릭 기반 국가기술자격 실기평가 연구

윤관식 ( Gwan Sik Yoon ),최명란 ( Myung Ran Choi ) 한국실천공학교육학회 2012 실천공학교육논문지 Vol.4 No.2

자기적 비선형성을 고려한 투자율 산정방식의 Switched-Reluctance Motor 전류 및 토오크 해석

孔寬植(Gwan-Sik Kong),安永珠(Young-Joo Ahn),黃煐文(Young-Moon Hwang) 대한전기학회 1993 전기학회논문지 Vol.42 No.8

넙치용 습사료의 항산화제 첨가효과

정관식(Gwan Sik JEONG),지승철(Seung Cheol Ji),안창범(Chang Bum AHN) 전남대학교 수산과학연구소 2003 수산과학연구소논문집 Vol.12 No.-

This study was conducted to investigate supplementary effects of the antioxidant, antioxidant premix and ethoxyquin to moist pellet diet (MP). Experimental fish (average body weight, 40 g) were divided into 5 group and each group was fed with raw fish diet (diet 1), 8:2 (ratio of raw fish to commercial compound meal) MP (diet 2), 8:2MP with antioxidant premix (diet 3), 8:2MP with fresh oil and ethoxyquin (diet 4), 8:2MP with oxidized oil and ethoxyquin (diet 5) for 8 weeks. The Growth rate of fish fed diet 3 was the best (167.1%). The growth rates of diet 1, 4 and 5 (138.8%, 136.0% and 145.0%, respectively) were significantly higher than diet 1 (108.3%). Feed efficiency of fish fed diet 3, 4 and 5 (53.7~55.9%) were significantly higher than diet 1 and 2 (45.6% and 49.0%, respectively). Crude protein and lipid contents of whole body fed the diet 3, 4 and 5 higher than those of diet 1 and 2. Also, these diet groups had higher hepatosomatic index (HSI), visceralsomatic index (VSI) and condition factor (CF) than the other diet groups.

노인의 자원봉사활동이 성공적 노화에 미치는 영향에 관한 연구

황관식 ( Gwan Sik Hwang ),김선희 ( Seon Hee Kim ) 한국노인의료복지학회 2012 노인의료복지연구 Vol.4 No.1

This research analyzed the effects of voluntary work on the aging process by surveying the aged over 60 years old residing in Dae-gu · Kyung-Book area from Apr 6th to May 15th, 2011. Total 236 copies of questionnaire were returned and the results can be summarized as followings. 1. Females in a good health condition with a high educational and decent economical background having a religion and a good relationship with their family showed to have a high level of achievement on their voluntary work. 2. The ones in a good condition with a high educational and economical background having a good relationship with their family living with their spouse together showed to experience a more successful aging process. 3. Correlation between their level of satisfaction with voluntary work and successful aging process. Among the factors, social responsibility had the biggest correlation. 4. Factors leading to the successful aging process. Among the factors, their satisfaction level of social responsibility affected them to lead to the successful aging process the most.

초피나무에 있어서 Pon - Pon 처리에 의한 종자 발아촉진과 (發芽促進) 삽목에 (揷木) 의한 무성번식 (無性繁殖) 개선

구관효(Gwan Hyo Goo),윤기식(Ki Sik Youn),최재식(Jai Sik Choi) 한국산림과학회 1993 한국산림과학회지 Vol.82 No.3

This study was carried out to seek for a most effective hastening method of seed germination by Pon-Pon treatment and asexual multiplication method by cutting in Zanthozylum piperitum . The results obtained in this study were as follows : 1. Cold moist stratification under the ground accompanied with Pon-Pon treatment was shown 74.3% of seed germination, which was the most effective one among pretreatment methods with significance at 1% level. 2. Height growth was shown continuous growth pattern and the maximum growth was shown during the period 1 July to 31 July, which corresponds 40.3% of total annual growth. 3. Although no noticeable difference among the kind of plant growth regulator in the rooting rate, there was difference among concentrations with significance at 1% level . 4. In the case of number of primary roots and T/R rate of rooted cuttings, treatment of plant growth regulators was significantly superior to control. 5. T/R rate in rooted cuttings was a high negative correlation (r=-0.7164) with the number of primary roots.