침전지내장형 상분리 산화구공정에 의한 하수 고도처리특성 평가

홍기호,장덕,한상배 한국물환경학회 2004 한국물환경학회지 Vol.20 No.6

Phased isolation intrachannel clarifier ditch process developed in this study is an enhanced biological nutrient removal process employing two ditches with intrachannel clarifiers. Bench-scale phased isolation ditch process was used to evaluate the system performance on municipal wastewater and detailed assessment of internal behavior in a ditch and each reactions. When the system was operated at the HRTs of 6∼12hours, SRTs of 9∼31 days, and cycle times of 4hours, the system showed removals of BOD, TN, and TP as high as 88∼97%, 73∼78%, and 65∼90%, respectively. The internal behavior were well matched on each reactions such as nitrification, denitrification, and phosphorus release and uptake. As the SRT became longer, TN removal increased gradually, whereas TP removal decreased contrarily. However, the system was capable of producing an effluent TP concentration 1㎎/L or less even at longer SRTs except the case of solids discharge by malfunction of intra-clarifier occurred by its geometrical limit. The system performance slightly decreased by hydraulic shock loading(increasing of influent flowrate and decreasing of system HRT). However, the higher system performance could be achieved again after four cycles. Thus, the system reliability could be successfully achieved short-term hydraulic shock loading that occurred in medium- and small-sized wastewater treatment plants suffering fluctuation of influent quality and flowrate during wet season.

Au를 공침한 SnO₂후막센서의 가스 감응 특성

성정훈,강대원,이윤수,임준우,홍영호,이덕동 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

High selective and sensitive thick film type methane gas sensors were fabricated and their sensing characteristics for various hydrocarbon gases were investigated. Raw material, SnO_(2)/Au, prepared by coprecipitation was even grain size. SEM, TEM, BET and XRD analyses were carried out for investigation of surface morphology and crystalline structure. The thick film devices using the above materials exhibited high sensitivity to methane gas at the operating temperature of 400°C. The sensitivity of SnO_(2)/Au+Pd thick film devices to methane gas was higher than that to the other hydrocarbon gases such as iso-butane and propane. The optimal adding amounts of Au and Pd were 1wt.% and 3wt.%, respectively. The sensitivity, S, is defined as {(R_(A)-R_(G))/R_(A)}><100, which R_(A) and R_(G) are resistance in air and that in the gas ambient, respectively.

경제체제와 사회질서

한덕규,홍성민 한국외국어대학교 외국학종합센타 중동연구소 1999 중동연구 Vol.18 No.1

디지털 포렌식의 기술 동향과 전망

전상덕,홍동숙,한기준 한국정보사회진흥원 2006 정보화정책 Vol.13 No.4

디지털 포렌식(Digital Forensics)은 법정 제출용 디지털 증거를 수집하여 분석하는 기술을 말하며 인권을 강조하는 요즘 IT 관련 기관과 기업을 중심으로 많은 관심이 집중되고 있다. 디지털 증거 수집 및 분석 과정은 기술적으로 복잡하고 난해하여 분석가의 전문성에 의해 증거의 무결성과 신뢰성이 결정된다. 디지털 증거 수집 및 분석 과정의 수준향상을 위해 IT 분야에서 많은 전문가의 참여와 디지털 포렌식의 고급기술에 대한 연구가 필요하다. 본 논문에서는 디지털 포렌식의 개요, 디지털 포렌식 도구의 소개, 디지털 포렌식 절차를 설명하고, 마지막으로 결론에서 디지털 포렌식 산업 육성 방안, 디지털 포렌식 전문 인력 양성 방안, 디지털 포렌식의 전망에 대하여 제시한다. 현재 국내외에서 활발히 수행되고 있는 디지털 포렌식 기술은 향후 유비쿼터스 컴퓨팅 환경을 지향하는 IT 분야에서 핵심 기술로서 인식되고 있으며, 또한 새로운 포렌식 기술에 대한 연구 개발이 더욱 체계적이고 활발히 수행됨으로써 새로운 비즈니스 영역도 창출될 수 있을 것이다. 그리고 첨단 과학기술을 이용하는 디지털 포렌식은 사법기관의 인권 보호와 사법 정의 구현에도 크게 기여할 수 있을 것이다.

유통시장의 변화와 중소상인의 쇠락 : 식료잡화점의 사례

李廷德,洪性翕 全北大學校 1996 論文集 Vol.42 No.-

This study trys to understand the recent change in Korean retail market and the reponse of related people. The data was collected through the search of news articles, interview, and participant observation. The massive input of foreign capital and merchandising technigue and of capital from Korean conglomerates(재벌) transforms the retail industry rapidly. Many small retailers already closed their stores and other traditional retailers(수퍼) try to organize themselves to compete with the new big discount stores, hypermarkets, wholesale clubs and convenience stores. However, the traditional small stores do not have enough capital to restructure themselves and have lost their customers to the new retailers. This change in retail industry also means a deterioration of the self-reproduction system of regional society and culture.

삼각형 모양에 의한 회절현상에 관한 연구

강성수,성덕용,육도진,홍성대,이원진 대구산업정보대학 2003 논문집 Vol.17 No.-

A review of diffraction phenomena for double slit and regularly triangular aperture has been done. First, as a width b and a space d of double slit vary, a diffraction pattern has been calculated by theory. Second, an intensity of diffraction light and separation between fringes for slit has been measured. And, we can expect that the calculated diffraction pattern for a regularly triangular aperture has three symmetric axes.

유포변경 간헐폭기식 침전지내장형 산화구시스템에 의한 하수의 탈질,탈인

장덕,홍기호,허준무,한상배 대한상하수도학회 2003 상하수도학회지 Vol.17 No.1

Phased isolation intrachannel clarifier ditch system devised in this study is an innovative biological nutrient removal system employing two ditches with intrachannel clarifiers and eliminating external per-anaerobic reactors and recycle of sludge and treated effluent. The performances of the system were evaluated through a long term pilot-scale experiments. The system operated at hydraulic retention times of 10-21hours and solids retention times of 16-36days showed removals of biochemical oxygen demand, total nitrogen, and total phosphorus in the range of 90-99%, 64-93%, and 63-98%, respectively, at the mixed liquor temperature above 10℃. The solids retention time played a relatively important role among the operational parameters of the system. As the solids retention time became longer, the effluent total nitrogen decreased dramatically, whereas the effluent total phosphorus increased. Optimal system operating strategies maximizing phosphorus release and its uptake as well as nitrification and denitrification satisfying both the best nitrogen and phosphorus removals included hydraulic retention times ranged 10-14hours and solids retention times ranged 20-25days. The phase separation in a cycle maximizing the performance of the system was completely accomplished by scheduling of alternating flow and intermittent aeration in a simplified process scheme. Especially, temporal phase separation for phosphorus release without additional anaerobic reactor was successfully accomplished during anaerobic period without any nitrate interference and carbon-limiting. The phased isolation ditch system with intrachannel clarifier developed in this study was, therefore, believed to be a simplified and improved option to solve the problems in the existing biological nutrient removal technologies.

호안전면의 이안제 배치조건에 따른 파랑-구조물의 상호작용

이홍식,김성덕,조원철 중앙대학교 건설환경연구소 2000 環境科學硏究 Vol.11 No.2

The structure-wave interactions have been studied to predict the wave fields at the coastal revetment around. The numerical modeling in the present study was based on the linear diffraction theory and boundary element approach. To investigate the interaction, the simulation has been carried out by varying the conditions of distance and length of an offshore breakwater in constant water depth. As result, various aspects of wave fields have been shown by geometric conditions of an offshore breakwater. It was found that the high waves have been significantly shown at coastal revetment around in cases of s/L=0.75 and 1.25.

당밀의 첨가가 갈근탕박 사일리지의 품질과 산양의 기호성에 미치는 영향

김성복,문계봉,이봉덕,오홍록,배형철,이수기 충남대학교 농업과학연구소 2006 농업과학연구 Vol.33 No.1

Two experiments were conducted to investigate the effects of molasses supplementation to silage materials in ensiling Galgeuntang (herbal medicine) meal on the quality of silage, and its palatability in Korean native goats. In experiment Ⅰ, molasses was added at the levels of 0, 0.5, and 1.0% to Galgeuntang meal with three replicates per treatment. In experiment Ⅱ, three 1.5-yr-old Korean native goats were used to measure palatability. In experiment Ⅰ, lactic acid contents in molasses treatments were significantly(p<0.05) higher, and pH and butyric acid contents were lower than those of non-molasses treatment. In addition, molasses treatment increased total microbial cell counts in MRS medium for lactobacillus, but decreased total microbial cell counts in PDA medium for fungi. Molasses supplementation to silage materials increased in vitro dry matter disappearance. Molasses supplementation tended to increase silage intake in Korean native goat (experiment Ⅱ), but the difference was not significant(p>0.05). It is concluded that molasses supplementation to silage materials in ensiling herbal medicine meal could improve its preservability and palatability, the higher the better.

Angiotensin Concerting Enzyme 유전자의 유전적 다형성(Genetic Polymorphism)이 관상동맥 질환 위험인자에 따른 혈중 Plasminogen Activator Inhibitor-1의 농도에 미치는 영향

김덕경,김종원,권현절,류재춘,박승우,김준수,이상훈,홍경표,박정의,이원로 대한고혈압학회 1996 대한고혈압학회지 Vol.2 No.2