혐기화 시간에 따른 활성슬러지의 물리·화학적 특성변화

이창한,나영수,김도한,이송우,송승구 한국환경과학회 2002 한국환경과학회지 Vol.11 No.4

Physico-chemical properties of the activated sludges(Suyoung and Changlim treatment plant). such as SVI(sludge volume index), absorbance, specific surface area, and specific resistance using Buchener funnel test were investigated with changing anaerobic storage time. This experimental condition was found that it was possible to estimate a linear relationship between their parameters such as specific area, specific resistance, and sludge volume index(SVI). The specific surface area and the specific resistance to filtration of the activated sludges of Suyoung and Changlim treatment plant were found as 123.6~136.6㎡/gDS and 41.5 ~ 44.9㎡/gDS(dry solid), and 1.09×10^14 ~ 5.48×10^14m/㎏, respectively. The results gave a good linear relationship between the specific surface area and the specific resistance. r=2.25×10^12s-8.10×10^13(R^2=0.8885) at Suyoung treatment plant and r=1.26×10^13s-4.75×10^14(R^2=0.8756) at Canglim treatment plact.

압출성형에 의한 국산 무연탄 활성탄의 세공구조 변화

이송우,문장천,김도한,이창한,최동훈,류동춘,송승구 부산대학교 환경문제연구소 2000 環境硏究報 Vol.18 No.-

The purpose of this study is to investigate the variation of pore size distribution of the coal-based extruded activated carbon. The extruded activated carbon was prepared by extruding the mixture of coal powder and coal tar. Pore size distribution of the extruded activated carbon was compared with that of the extruded coal and the extruded char. Also it was compared with that of the crushed activated carbon, raw coal and char. The extruded coal had coarser surface than that of raw coal. Macropores of the extruded coal were funned near 10,000Å in diameter during carbonization process and steam penetrated easily between particles and were growing between 3,000Å and 20,000Å in diameter during activation process.

제20대 대선 유튜브 선거캠페인 댓글연결망 분석 - 삼프로TV를 중심으로

송화영(Hwa-Young Song),이정민(Jung-Min Lee),박한우(Han-Woo Park) 한국콘텐츠학회 2023 한국콘텐츠학회논문지 Vol.23 No.2

이 연구는 제20대 대통령 선거의 소셜 미디어 선거 캠페인에 대한 대중들의 반응을 사회연결망분석을 이용해 살펴보았다. 구체적으로 유튜브 채널 ‘삼프로TV: 경제의 신과 함께’에 게시된 2022년 대통령 선거 후보자 토론 영상과 댓글을 수집하였다. 수집된 데이터를 기반으로 댓글 이용자 연결망 구조를 확인하기 위한 사회연결망분석, 댓글 이용자의 어휘 다양성 파악과 핵심이슈 파악을 위한 의미연결망분석을 수행하였다. 그 결과, 이재명 후보의 연결망이 윤석열 후보에 비해 이용자들 간 밀집도가 더 높았다. 어휘 다양성에 있어서는 윤석열 후보 영상 댓글이 더 다양한 어휘를 구사하는 것으로 나타났다. 이로써 영상 댓글 이용자들 간 ‘관계’에 초점을 두었을 때는 이재명 후보자의 영상이 윤석열 후보에 비해 더 집합적(collective)이었으나, 어휘의 다양성 측면에서 보았을 때는 윤석열 후보가 더 결합적(connective)인 것을 알 수 있다. 핵심 이슈의 경우, 이재명 후보는 후보자 발언에 대한 이용자의 생각이 주로 나타났고, 윤석열 후보는 후보자에 대한 평가나 비판의 내용이 나타났다. 이 연구는 ‘말’보다 ‘행동’에서 비롯된 데이터의 중요성과 약한 유대의 힘 이론이 설명력을 지니고 있음을 시사한다. Using social network analysis, this study investigated people’s responses to Youtube-mediated debate during the 2022 presidential election in Korea. Videos and comments, that were uploaded on the YouTube channel “Sampro TV: With the God of Economy”, were collected using Webometric Analyst 2.0 software. Several network techniques was performed on the obtained data to uncover the structure of the comment user network, and a semantic network analysis was also performed to identify the linguistic diversity of comment users and to identify critical issues. As a result, candidate Lee Jae-Myung’s network had a greater user density than candidate Yoon Suk-Yeol’s network. Yoon Suk-Yeol’s video comments were found to employ more diversified terminology. As a consequence, when focused on the strength of relations between video comment users in a core group, Lee Jae-Myung’s video was more collective and communal than Yoon’s, although Yoon is more connective in terms of vocabulary diversity. In the case of major issues, Lee’s commenters mostly displayed their supporting thoughts on his discussions, whereas Yoon’s commenters displayed the contents of evaluation or critique. The findings of this study is discused from a perspective of the strength of weak ties in social networks.

손상정도계수와 외상치를 이용한 외상환자의 분석

송근정,장문준,김성중,조광현,김인병,최성욱,이한식 대한응급의학회 1993 대한응급의학회지 Vol.4 No.2

Trauma is one of the most common causes of death. Recently, injury severity score(ISS) is widely used to evaluate and classify the patients with multiple injury. Trauma score(TS) was developed as a means of providing rapid accurate assessment of the injured patient. Authors conducted a review of trauma patients who visited the emergency department of YongDong Severance Hospital from September 1992 to August 1993. ISS and TS were collected from comprehensive initial evaluation. The results were as follows : 1) The subjects were 10.2%(2,666 patients) of total 26,202 emergency patients. 2) Male to female ratio was 2.1 : 1. The age distribution was highest under 10 year(24.9%). The mean ISS was 3.5, and the mean ISS increased with ago. 3. Analysis of injury mechanism showed high incidence of traffic accident(35.3%), blunt trauma 25.7%, fall 24.2%, stabbing 10.7%, and others 4.3% in order. 4. The 8.0% of patients were admitted after initial management and their mean Iss was 12.6 mean TS was 15.5. 5. Among admitted traffic accident patients, the mean ISS of passenger T.A., pedestrian T.A. and driver T.A. were 19.0 ±9.9, 14.4 ±10.6, and 11.3 ±7.7 respectively. 6. Among 42 mortality cases, 25 patients were D.O.A. and 17 were expired. The mean ISS of D.O.A. Patients was 30.0; the mean Iss and mean Iss and mean TS of expired patients were 28.3 and 11.8 respectively. 7. The most common cause of death was head trauma(66.7%). 8. By comparing the ISS and TS of admitted and expired patients, mortality occurred above 16 point of ISS. The mortality increased with increasing ISS, but it was influenced by the trauma site and the severity of the particular injury site. Mortality also occurred below 15 point of TS, the mortality increased inversely with TS, and the mortality with TS, and the mortality was high below 13 point (above 40%).

트레픽 특성 분석을 통한 ATM 네트워크 설계

이석송,김한경 창원대학교 정보통신연구소 2001 精報通信論文集 Vol.5 No.-

To configure Switching backbone network, traffic analysis of characteristics should be the first thing to do.Not only traffic volume check, but also traffic type analysis on QoS and applied protocol is required. We definitely need to consider ATM backbone supporting 7oS and expansion as the system tend to go for the web-based resolution system and the application for e-commerce. Switching backbone configuration means not just a securing network bandwidth but a comprehensive and systematic approaching. This thesis suggests precise analysis on the base of standard and data - traffic inquiry of current and future networkas preceding works for the rational approaching.According to those analyses, recommendations for network design can be suggested. By the considerations on the result of analysis with QoS, it has been concluded that it is preferred to migrate ATM switching backbone rather than the current FDDI backbone network, which is mentioned in the thesis. It is needed to design most efficient backbone network by traffic characteristics analysis of gigabit switching model which regarded as future backbone switch along with ATM switching.

은행의 보험업 진출 시나리오

李漢德,宋暎曉 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

This study presents scenarios regarding highly possible strategic plans that domestic banks can adopt to penetrate in insurance business due to the introduction of Bancassurance in August, 2003. In case of large banks, making contracts of the independent agency with insurers or establishing joint venture with insurers would be possible options to be taken in a short run. In case of small and medium banks, making contracts of the independent agency with insurers would be a only possible option to be taken. In a long run, maintaining independent agency contracts with insurers, changing into the exclusive agency contracts, establishing joint venture with insurers, acquiring existing insurers, stablishing insurance subsidiaries, or making capital alliance with insurers would be plausible options to be taken by large banks. In case of small and medium banks, maintaining independent agency contracts with insurers, or changing into the exclusive agency contracts would be only possible in a long run. It is expected that the introduction of any kinds of Bancassurance will be more favorable to banks than to insurers. Therefore, insurers should try hard to establish strategic plans to survive in a very competitive financial environment.

CM(건설사업관리)배상책임보험 도입방안

宋映曉,李漢德 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

When construction-related accidents happen, it takes a lot of time and costs to locate and allocate responsibilities among construction-related parties. In many cases, negligence of contractors, architects and construction supervisors is combined and it is very hard to clarify who is responsible and how much they are responsible. This kind of the dispute often hinders swift indemnification of injured parties and recovery of damaged works. This study proposes activation of construction management(CM) and the introduction of construction management liability insurance to facilitate to repair damaged works and indemnify injured parties resulting from construction accidents. It should be mandatory for construction managers to buy construction management liability insurance in public construction works. Ultimately, construction management liability insurance should be applied to private construction works.

韓國에 있어서 肝吸蟲症 分布에 관한 疫學的 硏究

宋寅喆,李駿商,林漢鐘 고려대학교 의과대학 1983 고려대 의대 잡지 Vol.20 No.1

Korea, a total number of 19,758 stool specimens were collected from the inhabitants who lived in the basins of main 6 rivers, i.e. the Han River, the Gum River, the Nakdong River, the Mangyong River, the Yongsan River and the Seomjin River. The specimens were examined both by cellophane thick smear method and Stoll's egg counting technique during the period from March 1973 to October 1982. The distribution and infection rates were compared in those of river and non-river sides, and the epidemiological statrs was analysed statistically by the regression equations and catalytic curves with the results obtained from two endemic areas. The results are as follows: 1. High egg positive rates were revealed among the inhabitants in the areas of all above river basins, whereas low egg positive rates were obtained among the inhabitants in the areas apart from the riversides. However, in some areas which are not directly connected with the rivers, relatively high rates of Clonorchis infection were also observed. 2. The infection rates of Clonorchis sinensis by sex age were shown significantly different among the population in the most of these studied areas. The rates for males were significantly higher than that for females, and the rates were increased by the higher age groups up to 40 to 59 years old. However in the high endemic areas such as Kimhae the infection rates of both sexes were almost parallel and practically similar high rates revealed in all age groups for 20 to 60 years old. 3. The mean E.P.G. count of Clonorchis infection in the surveyed areas was found higher in the areas which shown as higher infection rates. The degree of the intensity of Clonorchis infection by E,P.G. counts was evenly distributed to heavy and very heavy infections as well light and moderate infections in the areas showed high infection rates. 4. The intensity of endemicity in all surveyed areas was compared with the regression equations calculated with the cumulative percentages of E.P.G. counts. 5. For the quantitative analysis of epidemiology of clonorchiasis in Kimhae and Pyongtrek areas, special type of simple catalytic model was applied to the age prevalence rates revealed through stool examination for Clonorchis eggs and intradermal test for the detection of positive reactors. 6. It was suggested that the two-stage catalytic was well fitted to the prevalince rates by sex and age in the egg positive cases in Kimhae and Pyongtaek areas, and the calculation lead to the equation y=1.042(e-^(0.003t)-e^(-0.074t), a=0.074〉b=0.003 in Kimhae area, and y=1.412(e^(-0.024t)-e^(-0.041t), a=0.024〈b=0.041 in Pyongtaed area. 7. In the high endemic area such as Kimhae, the tendency of familial aggregation was not recognized by statistical analysis. In this area, the mean E.P.C. obtained from same persons in 1973 were compared and descussed statistically.

석탄폐석으로 제조한 흡착제의 물리적 특성

이상인,송근호,오한기,김종수,이광래 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-

석탄폐석인 선탄폐석과 굴신폐석으로 흡착제를 제조하였으며, 탄화/활성화 조건이 흡착제의 물성에 미치는 영향을 조사하였다. 탄화온도 500℃에서는 제조된 흡착제에 미세공이 형성되지 않았으며, 수증기법에 의한 850℃의 활성화 공정에 의하여 미세공이 생성되었다. 생성된 미세공에 의한 표면적은 전체 표면적의 약 50%를 차지하였다. 활성화된 흡착제의 표면적은 탄화과정만 거친 것보다 2.5배 더 컸다. 이는 활성화공정이 흡착제의 표면적에 미치는 영향이 매우 크다는 것을 의미한다. 굴진폐석으로 제조한 흡착제의 BET 표면적이 선탄폐석으로 만든 것보다 1.7∼2.9배 더 크게 나타났다. Coal waste-based adsorbents were prepared, and the effects of carbonization/activation conditions on the physical properties of the adsorbents were investigated. Two kinds of coal waste, coal-dressing waste and coal-dub waste, were used as raw materials. At carbonization temperature of 500℃, micropores were not formed in adsorbents. However, micropores was about 50% of total surface area. The surface area of activated adsorbent was 2.5 times greater than that of carbonized one. The BET surface area of coal-dub waste based adsorbents was 1.7∼2.9 times greater than that of coal-dressing waste based adsorbents.

전신마취 후 발생한 악성고열증 환자의 치료 경험

이근무,정승환,이정한,정순호,최영균,김영재,신치만,박주열,이영민 白中央醫療院 2005 仁濟醫學 Vol.26 No.1

Malignant hyperthermia is the disorder of calcium regulation within skeletal muscle associated predominantly with anesthesia. It is triggered by volatile anesthetics and depolarizing neuromuscular blocking agents. We experienced a case of malignant hyperthermia. 50 years old female patient was transferred to our emergency room that she was developed tachyarrhythmia and high fever. She was taken arthroscopic examination under the general anesthesia with enflurane and succinylcholine. We suspected malignant hyperthermia and promptly treated her with dantrolene sodium. She was developed disseminated intravascular coagulopathy and acute renal failure then we were intensive care to her. She was discharged without sequela. We experienced successful management of malignant hyperthermia.