유역통합관리의 방안 연구 : 낙동강을 중심으로

우주호 동의대학교 지방자치연구소 2004 공공정책연구 Vol.21 No.-

This article is the study of Integrated Watershed Management of Naktong River. In the past, water management was sub-sectorial, mostly in relation to water supply, irrigation and flood control. There is a growing consensus that integrated watershed management is necessary for sustainable use of water resource for all interests and protection of the environment. The primary objective of this study is to purpose to build an ideal plan of the Integrated watershed management system in Korea. To attain this primary objective, constitutional, organizational and operational requisites should be well established. Based on these three criteria, the current korean watershed management system are evaluated by the two sectors, that is the management of water quantity that is water use and flood control, and the management of water quality that is environment of watershed. The evaluation results show that there are some degree of differences among the sectors, but in general, current watershed management system are far behind to implement integrated watershed management in korea. The conclusion of this study is as follows; To build an ideal integrated watershed management is necessary to carry out three policy subjects, that is the unification plan of watershed management, the integrated management of water quantity and water quality, and the activation of local network system.

인천광역시 강화 지역의 식물상

우광복,장진성,장계선,어주경,이은희 서울大學校農業生命科學大學附屬樹木園 2008 서울大學校 樹木園 硏究報告 Vol.- No.26

This study was carried out to investigate the flora of major mountains located in Gwanghwa Island, Incheon Metropolitan City. Three or four times of field collection were conducted for four sites (Mt. Hyeolgu & Toemo, Mt. Haemyeong, Mt. Hwagae and Mt. Bongcheon) in 2007. Totally 67 families, 164 genera, and 215 taxa were collected. The flora of surveyed area contained 16 taxa of conservation priority grade. The total scored points of the surveyed area were 40 points. The points for collection sites were listed as follows; Mt. Hyeolgu & Toemo (16 points), Hwagae-san (16), Haemyeong-san (14), and Bongcheon-san (8). Clematis brachyura Maxim., Viburnum carlesii Hems!' found at Mt. Haemyeong in Seokmo Island, which are endemic and rare in Korea, need to be paid attention for consersation.

고점성 바이오유의 미립화를 위한 초음파의 적용

주은선,나우정,김종천 慶尙大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.12 No.-

An experiment was conducted to figure out the atomization characteristics of rice-bran oil which is a highly viscous liquid by applying ultrasonic energy to improve the atomization of spray droplets. A spray simulator, an ultrasonic system, and six different nozzles(three kinds of single hole-type nozzles and three kinds of pintle-type nozzles) were made. To investigate the effects of ultrasonic energy on the atomization of a highly viscous liquid, a phase doppler particle analyzer was used for measurement and calculation of spray droplets data. Nozzle opening pressures chosen were of 5 levels, i. e., 10 MPa, 13 MPa, 16 MPa, 20 MPa, and 24 MPa. It was observed that the application of ultrasonic energy into the highly viscous rice-bran oil was effective for the atomization improvement of the liquid fuel. With the increase of nozzle opening pressures and pin-edge angles, and with the decrease of the hole diameters, the atomization of spray droplets was improved, which conforms to general theoretical characteristics.

굴절률이 Dual-Beam LDV의 信號特性에 미치는 影響

朱恩選,羅又禎 慶尙大學校 1986 論文集 Vol.25 No.2

The effects of refractive indices on the visibility which is an important characteristic in a Dual-Beam LDV are investigated. There are two methods for experiment; One is in the case of the variety of refractive indices of scatterers, and the other in the case of the variety of refractive indices of media. In this study, the above second method was selected in order to find that the refractive index is an important parameter on the visibility. A resistance wire with 30㎛ width and a Pt wire with 50㎛ width were applied as scatterers. Five media, ie., H2O(n=1.332), Chloroform (n=1.444), DMSO (n=1.476), Benzyl alcohol (n=1.538) and Carbondisulfide (n=1.628), were used as surrounding media. In the result, it is found that the refractive index of scatter is a parameter of the visibility.

배·급수 시스템에서 부식방지제의 적용 평가 연구

우달식,문정기,구성은,최종헌,김주환,문광순 대한상하수도학회 2003 상하수도학회지 Vol.17 No.5

This study evaluated the effect of the corrosion inhibitors on the corrosion control performance in drinking water distribution system. A phosphate-zinc based inhibitor formulated was for the efficient corrosion control in drinking water distribution system. In a continuous-circulation test, 99% reduction in corrosion rate was achieved. The optimum concentration of the corrosion inhibitor was found to be 2.2㎎ PO₄/L. The effect of the corrosion inhibitor was significant for the pipes of carbon steel, galvanized steel and copper, but less for that of stainless steel. The corrosion inhibitor can be an effective cure for corrosion and red water problems by prevention the old pipes from further corrosion. Tap water in Mokpo and Kwangyang were more corrosive than the water in the rest of 4 other regions(Seoul, Pohang, Pusan, Puyeo). Tap water in Pusan was high in various ionic concentrations in general. The corrosion inhibitor reduced the corrosion rate by 76-94%, depending on the origin of the tap water.

Formocresol pulpotomy와 연관된 함치성 낭종의 시험례

주태준,박호원,이주현,서현우 大韓小兒齒科學會 2009 大韓小兒齒科學會誌 Vol.36 No.3

1904년 Buckley에 의해 치근관 살균제로 도입된 이후로 1:5로 희석된 formocresol을 사용한 치수절단술이 치아우식에 의한 유치의 비가역적 치수염시에 가장 많이 사용되어 왔다. Formocresol은 치수조직의 높은 고정능력으로 높은 임상적 성공률을 보이고 있으나 자체독성이 매우 강하여 영구 계승치 치배의 변위나 결손, 법랑질 형성 부전, 전신흡수로 인한 돌연변이 가능성과 암유발 가능성 역시 보고되고 있다. 또한 formocresol을 사용한 치수절단술 후에 과사용된 formocresol에 의한 만성적인 염증이 계승 영구치로 확산되어 퇴축법랑상피의 증식을 자극하고 법랑질로부터 퇴축법랑상피를 분리시켜 함치성 낭종을 형성할 수 있음이 보고되고 있다. 본 증례는 3년 전 응급으로 하악 좌측 제 2유구치의 formocresol을 사용한 치수절단술 후 정기 검진을 위해 내원한 환자의 방사선 사진에서 함치성 낭종이 발견되어 낭종 제거와 함께 유치의 발치를 시행했고 발치된 유치에서 formocresol cotton pellet이 제거되지 않은 채로 발견되어 formocresol이 장기간 남아있음으로 인해 낭종을 형성할 수 있음을 보고하는 바이다. Buckley's formocresol was first introduced as a pulp medicament in 1904, and since 1930, it has been the treatment of choice for primary molar pulpotomies. Formocresol has fixation effect of pulp tissue and high clinical success rate. But side effect such as displacement and loss of permanent successor, amelogenesis imperfecta, cyst formation, mutation by general absorption, possibility of cancer induction have been reported. Of those, dentigerous cyst can form in the periradicular region after formocresol pulpotomy caused by an alteration of the reduced enamel epithelium, which result in fluid accumulation between the epithelium and the tooth crown. The present case describes a 6-year-old girl who had accidentally discovered in the panoramic radiograph a single, well-defined, radioluscent area enclosing the second unerupted mandibular premolar. The second left primary molar had been pulpotomizied 3 year before. Surgical treatment was carried out, the primary molar was extracted and cystectomy was performed under local anesthesia. In the extracted second primary molar, formocresol cotton pellet was left in the pulp chamber. Histologic study confirmed the suspected diagnosis of dentigerous cyst. This report present a case of dentigerous cyst associated with inadequate formocresol pulpotomized deciduous molar.

소아청소년과의사의 영유아기 구강건강 관리에 대한 인식도 조사

주태준,박호원,이주현,서현우 大韓小兒齒科學會 2009 大韓小兒齒科學會誌 Vol.36 No.3

국민건강보험공단에서 실시하는 영유아 건강검진은 5회의 일반검진과 2회의 구강검진으로 구성되어 있다. 하지만 9개월 영유아 건강검진 시 구강건강 상담 및 교육은 일반의사가 담당하도록 되어 있어 이를 주로 담당하게 될 소아청소년과의사의 구강건강 상담 항목에 대한 지식이 필요한 상황이다. 이번 조사의 목적은 소아청소년과 전문의나 전공의를 대상으로 영유아기 구강건강교육에 대한 인식도를 알아보는 것으로 150명의 설문을 분석해 다음과 같은 결론을 얻었다. 1. 조사 대상자의 대부분은 유아기우식증으로 인한 치과 의뢰 경험이 있었고, 절반 이상의 응답자는 영유아 환자에 대해 구강검사를 시행하지 않고 있었다. 2. 조사 대상 소아청소년과의사들의 첫 치과방문 시기에 관한 적절한 인식도가 확립되지 않았다. 3. 영유아 건강검진 중 구강건강 교육 항목에 대한 인지도가 전반적으로 부족하였다. 이에 대한 교육의 강화가 필요하다. 4. 영유아 구강질환 예방을 위한 의과계의 관심과 더불어 치과계와의 협조가 필요하리라 생각 된다. For prevention of ECC, the Korean Academy Of Pediatric Dentistry(KAPD) advocate that Children should be seen as early as 6 months of age after the first tooth erupts, or 12 months of age. Pediatrics have increased access to new mothers and children 6 to 12 months while dentists does not see young children unless there are urgent problems. Therefore, they have an opportunity to impact infant oral health care. This study's purpose was to examine pediatricians' awareness and experience about infant oral health care. For the study, we surveyed of 150 pediatricians in korea. The survey comprised 10 questions related to infant oral health care and the recommended age a child go for their first dental visit. The results were as follows: 1. Most respondents had been referred children to a dentist for treating ECC and more than half of respondents reported that they did not do oral examination in their practice. 2. The majority of surveyed pediatricians are not advising patients to see the dentist by 1 year of age. 3. The surveyed pediatrician's awareness of infant oral health care is insufficient. The oral health education should be reinforced. 4. There is a need for increased infant oral health care education in the medical and dental communities.

자동차 포탈 사이트의 비즈니스 모델 연구

우성진,이민우,박주철 울산대학교 2001 공학연구논문집 Vol.32 No.1

인터넷에서의 비즈니스 전개는 그 특성상 시간과 공간에 구애받지 않는다는 장점이 있다. 또한 포인트 마케팅이 가능하여 이러한 장점을 이용하려는 기존의 오프라인 기업들과 온라인의 인터넷 기업들이 인터넷 비지니스(E-business) 사업에 뛰어들고 있다 오프라인 기업들의 경우, 시장의 제약성에서 탈피하고자 인터넷을 마케팅 수단으로 인식하고 영역을 넓히고 있는 실정이다. 최근에는 여러 부문 중, 자동차 부문에 대한 인터넷 비지니스(E-business)의 관심이 고조되고 있으며 기존의 인터넷 기업들과 제조업체들간에 인터넷 시장에 대한 진입으로 경쟁이 치열해지고 있다. 본 연구에서는 기존의 일반적 비즈니스 모델을 분석하고, 자동차 포탈 사이트의 비즈니스 모델에 대해 논의한다. 인터넷 기업들이 가지는 제약성인 오프라인에서의 활동성을 강화하고, 인터넷 사용자에게 고수준의 논리적/물리적 서비스를 동시에 제공할 수 있는 자동차 포털 비즈니스 모델을 제시하고자 한다. 이러한 연구를 통해, 자동차 포탈 사이트의 활동방향과 인터넷 비즈니스 모델에 대한 이해도를 높일 수 있으며, 웹 사이트의 개발에도 도움을 줄 수 있을 것으로 기대된다. Off line company recognize the internet as the marketing tool to overcome the limitation of the market. Above all, the company related to the car industry has a keen interest in E-Business. In this paper, we investigate general business model and propose a new business model of car portal which is integrated on-off support with physical-logical service of the high level for customer. We expect that this business model give a help to understand about E-business Model and develop the various E-business model.

CMP 실리카 슬러리 노화 현상에 대한 연구

이우선,최권우,고필주,서용진 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.1

As the integrated circuit device shrinks to the smaller dimension, the chemical mechanical polishing (CMP) process was required for the global planarization of inter-metal dielectric (IMD) layer with free-defect. However, as the IMD layer gets thinner, micro-scratches are becoming as major defects. Micro-scratches are generated by agglomerated slurry, solidified and attached slurry in pipe line of slurry supply system. It is well known that the presence of hard and larger size particles in the CMP slurries increases the defect density and surface roughness of the polished wafers. In this paper, we have studied aging effect the of CMP slurry as a function of particle size. We prepared and compared the self-developed silica slurry by adding of abrasives before and after annealing. As our preliminary experiment results, we could be obtained the relatively stable slurry characteristics comparable to original silica slurry in the slurry aging effect.

레이저 간섭계(ESPI)에 의해 측정된 플립칩 열변형의 유한요소해석 모델링을 통한 솔더볼의 유동곡선 평가

이백우,김주영,나재웅,백경욱,권동일 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.6

The goal of this study was to determine the uniaxial flow curve for solder balls in a flip-chip from experimental-computational algorithms based on finite element modeling (FEM) of in-plane thermal displacement data measured by electronic speckle pattern interferometry (ESPI). In order to measure the deformation of such tiny components as the solder balls in the flip-chip, the spatial resolution of ESPI was increased to submicron scale by magnifying the areas studied. The flow curve for solder balls in the flip-chip was determined by the algorithm, which effectively matches the simulated solder deformation by FEM to the measured deformation by ESPI. The algorithms were applied to Sn-36Pb-2Ag flip-chip solder balls. The flow curve obtained for flip-chip solder was compared with those for bulk solder. The microstructure was also studied to clarify the flow curve results.