加壓浮上法에 依한 活性슬러지 混合液의 固液分離에 關한 硏究

梁相鉉,羅德寬 全北大學校 1985 論文集 Vol.27 No.-

An effective technique of sludge separation is required for concentrated activated sludge process. The dissolved-air flotation (DAF) has been shown to be efficient process for sludge separation. The factors affecting DAF process for activated sludge separation are type and concentration of sludge, air/solid ratio, ratio of pressurized water flow, pressure, sludge detention time, temperature, sludge and hydraulic loading rate, recycle flow rate of sludge and type and quantity of chemical aid. In order to study the optimal operation condition for sludge separation, the influence factors such as type and concentration of sludge, ratio of pressurized water flow and pressure are investigated by batch and continuous reactor experiments of DAF and sedimentation test. The results obtained through experimental investigation are as follws; 1. For the bulking and concentrated sludge, DAF is more effective than sedimentation for the sludge separation. 2. In DAF, the critical ratio of pressurized water flow exist. The critical value varies with the pressure in the tank. That is, according to the pressure changes from 3 to 5 kg/㎠, the critical value varies from 0.25 to 0.67 accordingly. 3. Pressure affects the ratio of pressurized water flow, but it does not show any influence upon the DAF efficiency directly. 4. Continuous experimental rerults was not better than those of batch.

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.

Norepinephrine이 흰쥐 해마박편에서 아미노산 신경전달물질 유리에 미치는 영향에 관한 연구

김성룡,김관식,정동균 대한구강생물학회 1990 International Journal of Oral Biology Vol.14 No.1

Present study was performed to clarify the effect of norepinephrine on the release of amino acid neurotransmitters employing hippocampal slices. Hippocampal slices (300-400㎛ thick) were prepared by the method of Spencer et al.(1976) and pre-equilibrated in Krebs-bicarbonate medium (KBM, pH 7.4) for 1 hr at 37℃. Pre-equilibrated slices were incubated in fresh KBM and then veratrine (25μM)-containing KBM for 10 min period. Basal and veratrine-induced release of GABA and glutamic acid were determined from recovered medium by HPLC. After 30 min resting period, slices were reincubated in norepinephrine-containing KBM and test agent plus veratrine-containing medium consecutively for 10 min period each to investigate the effect of norepinephrine on basal or veratrine-induced amino acid release from hippocampal slices. The observed results were as follows: 1. The release of GABA induced by the first and second 10min-exposure of 25μM veratrine was 246.9±16.82 nmol and 209.9±20.84 nmol, respectively. When compared with released amounts of GABA during the corresponding spontaneous periods, these were 7.3 and 7.3-fold increase respectively. 2. The release of glutamic acid induced by the first and second 10min-exposure of 25μM veratrine was 426.3±63.16 nmol and 377±61.83 nmol, respectively. When compared with released amounts of glutamic acid during the corresponding spontaneous periods, these were 9.9 and 10.2-fold increase respectively. 3. Norepinephrine (1-100μM) increased veratrine-stimulated and spontaneous release of GABA in dose-dependent manner. 4. Norepinephrine (1-100μM) inhibited veratrine-stimulated glutamic acid release in dose-dependent fashion.

패혈증과 피부 감염증 의증으로 오진된 스티븐스 존슨 증후군 1예

정성구,김명천,고영관 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Stevens-Johnson syndrome(SJS) is a rare, life-threatening, drug-induced cutaneous reaction which presents dramatic, unforgettable manifestations. While the characteristic features of the disease are well known universally, many physicians have not seen a case of SJS which may result in delay in recognition and treatment. We report a rare case of SJS, which was initially misiagnosed as sepsis with skin infection and atypical pneumonia on emergency department presentation, and we give a brief review of the literature.

Ascorbic acid 가 골조직세포군의 Phosphatase 에 미치는 영향

김상균,김관식,정동균 대한구강생물학회 1987 International Journal of Oral Biology Vol.11 No.2

Several lines of findings suggest that ascorbic acid might influence the function of osteoblasts although no direct evidences were provided. This study was undertaken to investigate the effect of ascorbic acid on bone cells employing 5 fetal rat calvarial cell populations isolated by sequential enzyme digestion. Fetal rat calvaria were treated 5 times consecutively with enzyme mixture of collagenase, trypsin and EDTA for 10, 10, 10, 20 and 20 minutes. Each bone cell population was primarily cultured for 6-7 days and then the effect of ascorbic acid (10 and 100㎍/ml) on the phosphatase level were determined. The observed results were as follows. 1. Population IV and V had characteristics of osteoblast such as high alkaline phosphatase level and low acid phosphatase. 2. Ascorbic acid decreased the acid phosphatase activity of population IV, regardless its concentration while did not affect other cell populations. 3. Alkaline phosphatase activity of population IV was increased significantly by ascorbic acid. 4. Taken together, these results suggest that ascorbic acid may promote the differentiation of osteoblasts and its effect is restricted in osteoblastic population only, not in other type of bone cells.

근원세포 분화조절 유전자의 클로닝

강성구,이채관,김상해,김정락 인제대학교 1992 仁濟論叢 Vol.8 No.2

배아의 근원세포는 분화가 진행 됨에 따라 성체의 골격근 세포로 된다. 이러한 분화단계에는 특정 유전자가 관여할 것으로 추정되며 이전 실험에서 0.8Kb의 cDNA를 확인하였다 (Kang et al., 1992). 이러한 특이 유전자는 계배 부화 9일째부터 발현이 되었으며 성체에서는 발현이 되지 않았다. 특히 12일과 14일 계배의 뇌,간,신장조직에서는 유전자 발현이 되지 알았으며 단지 가슴근육조직에서만 유전자 발현이 되었다. 이 유전자는 계배 골격근 세포의 분화에서 중요한 역할을 할 것으로 추정된다. Embryonic myoblasts become determined to differentiate into distinctive types of muscle cells. Skeletal muscle cell is one of them. We studied the expression of muscle specific 0.8Kb cDNA related to the differentiation of chick embryonic myoblast in various stage of development and in organs. The gene was expressed from 9 day old chick embryo stage, but was not expressed at adult breast muscle. Also the gene was not expressed in brain, liber, kidney but expressed in 12 and 14 day old chick embryonic breast muscle. Therefore, this muscle specific gene(0.8Kb) may have an important role in regulating the diffrentiation of chick embryonic myoblast.

구강 연조직 병소의 Nd:YAG laser를 이용한 치료 : 임상 증례보고 CLINICAL CASE REPORTS

김수관,조세인,권병곤,이상호 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.4

The neodymium:yttrium-aluminum-garnet (Nd:YAG) laser is most widely used for treatment of lesions affecting the oral mucosa. A pulsed Nd:YAG laser (SDL-300EN, Samsung Electronics, Korea) with a wavelength of 1.32㎛ was used. In all cases, contact mode was used. Four cases of soft tissue oral lesions are presented to document the clinical aspects. Surgery proceeded without complication and healing was uneventful. This study indicate that the Nd:YAG laser can be used successfully for intraoral soft tissue applications are well tolerated and minimal bleeding.

버어리종 담배의 염소에 관한 연구 : 염소시용시기 및 시용량이 담배의 염소흡수 및 엽중분포에 미치는 영향 The effects of application time and rate of chlorine on the chlorine absorption and distribution in each stalk position of the plants

김상범,배길관 충북대학교 엽연초연구소 1988 煙草硏究 Vol.13 No.-

Effects of application time and rate of chlorine on the chlorine absorption and distribution at different stalk positions of the plants were investigated in burley tobacco grown under the pot condition. Treatment consisted of 6 application times(from 2 weeks before transplanting to 8 weeks after transplanting with 2 weeks' interval) and 2 application rates(2g and 4g-KCl/pot) by 6×2 factorial experimental design. The tobacco plants took up the chlorine rapidly just after chlorine application, and the chlorine content of leaf was increased proportionally to the rate of chlorine application. The chlorine was accumulated much in lower leaves when chlorine was applied early, while the chlorine accumulated much in upper leaves when chlorine was applied late. The chlorine content of leaf was negatively correlated to the degree of brightness, red color and yellow color of cured leaf. Significant increases in cured leaf ratio, leaf thickness, leaf weight and weight per unit leaf area of harvested leaf were obtained with increased chlorine application. When the chlorine was applied early, the leaf weight showed increasing tendency.

4족 보행로봇의 지형-적응 알고리즘에 관한 연구

오상관,김영탁,유재명 중앙대학교 미래신기술연구소 2002 미래신기술연구소 논문집 Vol.11 No.2

보행로봇이 비평탄 지형에서도 자유로운 이동을 할 수 있기 위해서는 지형에 따라 적절한 알고리즘으로 변화시켜 보행하는 것이 중요하다. 지금까지 블라인드 로봇(blind robot)의 경우 각 다리의 착지점을 선택하는 방법에 초점을 맞추고 있으나 본 논문에서는 스트로크와 주기를 변화시켜 비평탄 지형에도 안정된 등속도 보행을 하는 알고리즘을 제시한다. Framix-DSP라고 하는 4족 로봇을 실험대상으로 하였고, 로봇은 물결-게 걸음새로 보행한다. One of the primary advantage of walking robots is their ability to walk in the irregular terrain. Adaptive algorithms that modify the gait according to the terrain must be provided to apply this advantage. Existing articles about adaptive gaits of blind robot are based on intelligent foothold selection. However, this article proposes a algorithm that is based on the variations of stroke and period to adapt the irregular terrain. If this adaptive algorism is used, robot can maintain periodic gait walking and constant speed using only force sensor even in the irregular terrain without external sophisticated sensor. Quadruped robot named FRAMIX-DSP is used as a working example and robot walks with the wave-crab gait.

임베디드 장치용 사용자 인터페이스 라이브러리 설계 및 개발

김시관,홍상렬,박형순 금오공과대학교 2006 論文集 Vol.27 No.-

임베디드 시스템 장치에서 사용자에게 정보를 제공하고 사용자의 입력을 받기 위한 언터페이스의 중요성은 인터넷의 발전 및 휴대 전화 PDA 등과 같은 개인 정보 접속 장치의 대중화로 점차 커져가고 있다. 개인 정보 접속 장치뿐만 아니라 산업 현장에서 사용되고 있는 임베디드 시스템에서도 장치 제어 및 감시에 사용될 GUI의 요구 증가는 계속 되고 있다. 하지만 임베디드 장치의 제어 및 감시를 위한 GUI 라이브러리의 개발은 아직 미비한 실정이다. 따라서 임베디드 시스템 장치를 제어하고 감시하기 위한 기존의 GUI 라이브러리 보다 더 발전된 Gill 라이브러리를 설계하고 개발하였다. 그리고 새로운 GUI 리아브러리를 이용한 데모 프로그램을 작성하였다.