버팀지지대의 선행하중에 따른 흙막이벽의 거동특성

裵鐘淳,權正烈,權敏載,朴卿局 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-

Urban excavation require highly reliable prediction technique for the design and construction of earth retaining structures in order to protect adjacent structures around deep excavation. Application of the pre-loading of bracing for deep excavation has been reported and known beneficial in reducing settlement behind the retaining wall. But this beneficial effects are net fully understood and recognized by many practitioners. Model tests have been carried out to evaluate the efficiency of pre-loading system in reducing ground settlement as well as adjacent structural damages around excavation in sand. The test results revealed that the applied pre-loading of approximately 50% showed effective reduction in the maximum lateral wall displacement and the maximum magnitude of ground surface settlements, Also, bracing forces and earth-pressure distribution behind the wal1 have been monitored during pre-loading at various excavation swages.

말뚝이 매입된 연약지반의 변형거동

裵鍾淳,權正烈,鄭晳允,朴卿局 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-

When embankment is constructed on soft ground, lateral displacements and consolidation settlements develops. When load work on the soft clay ground, we can earn the following result through model test that is the lateral displacement by the piles embedded distance(L) and the piles spacing rate(s/D). 1. As increasing L and s/D, the maximum heaving height(HH Max) of the ground was also increasing, and the maximum heaving distance(HL Max) became far from the end of the load. 2. As L and s/D was increasing, the maximum of the lateral displacement(SL Max) became increasing, and The location of the maximum lateral displacement(SL Max) occurred in the -0.17~-0.28B spot regardless L and s/D. 3. HH Maxof the ground is proportional to SL Max

동국대학경주병원에서 분리된 각종 병원성 세균 및 항생제 감수성 양상

하경임,고은하,전창호,정병욱,안우섭,김우택,배정수,어경윤 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

We investigated characteristics of bacterial infection and antimicrobial suscerptibility patterns of clinical specimens in Dong Guk University Kyong Ju Hospital from october 1991 to december 1992. The types of clinical specimens requested for culture were as follows ; pus(34.2%), urine(29.6%), sputum(25.2%), blood(9.2%), etc. The most frequently isolated organisms were E. coli(17.6%), Pseudomonas(12.7%), S. aureus(12.2%), and CNS(11.2%), orderly. Predominant organisms from pus, urine and sputum were S.aureus, E. coli and Pseudomonas. Blood culture was requested 1,244 samples from 614 patients, 91 pathogeni organisms were isolated(14.8% from patient and 7.3% from requested clinical samples). E. coli was most frequently isolated(29.7%) and Salmonella typhi was noted 8.8% from the requested samples. The patterns of isolated organisms according to departments were as follows ; E.coli and Klebsiella were frequently isolated in internal medicine and general surgery, E.coli and Pseudomas in Neurosurgery, S. aureus and Pseudomonas in orthopedic surgery. In ICU, Pseudomonas was predominatly isolated and the rate of mixed infection was also high(16.4%). Most of gram-negative bacilli revealed relatively high susceptibility to Chlorampenicol, Amikacin, Tobramycin and Carbenicillin, but Acinetobacter were only susceptible to Carbenicillin and Tetrecyclin, and Serratia were to Carbenicillin and Amikacin while Salmonella were susceptible to all tested first drugs. The proportions of multi-drug resistant bacteria were 34.9% of Acinetobacter, 21.1% of Serratia, 20.0% of Pseudomonas and 15.4% of Citrobacter but Aztreonam was highly susceptible(84∼100%) except Acinetobacter. S. aureus and CNS were susceptible to Chlorampenicol, Oxacillin, Cephalothin and Vancomycin, especially, 100% susceptible to Vancomycin. But Methicillin reistant Staphylococcus aureus were very high(49%) inspite of new constructed hospital. Pneumococcus and Streptococcus species were relatively high susceptible to all tested drugs.

개방병동과 폐쇄병동의 치료환경에 대한 비교연구

김경중,배안,조남현 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.4

연구 목적 : 정신과 병동의 치료환경은 환자의 치료전귀에 중대한 영향을 미친다. 저자들은 주로 만성적인 정신과 입원환자들이 입원 치료를 받고 있는 국립나주정신병원에서 개방병동과 폐쇄병동의 치료환경의 특성과 각각의 병동내 직원과 환자의 병동환경에 대한 태도를 비교해보고자 보았다. 연구 방법 : 본 연구자들은 국립나주정신병원에서 비교적 개방과 폐쇄의 전형성을 보이는 남녀병동 각각 1개씩, 총 4개의 병동을 선정하여 그 병동의 환자와 직원을 대상으로 1995년 6월부터 8월까지 3개월 간 월 1회 병실 환경평가척도(Word Atmosphere Scale : WAS)를 실시한 후 각 군들의 WAS에 대한 하위척도의 평균값을 Student's t-test로 비교 분석하였다. 연구 결과 : 1) 폐쇄병동은 직원의 통제와 병동의 규칙을 중요시하고 환자의 자율성이 무시된 통제위주프로그램(control-oriented program)의 치료환경과 유사하였으며, 이러한 평가는 직원들보다는 환자들이 보다 명확하게 지각하고 있다. 2) 개방병동은 직원과 환자 및 환자들끼리 서로 지지하고 격려해주면서 환자의 실제적인 문제의 해결에 중점을 두는 치료환경으로 나타났으며, 특히 직원들은 치료계획차원(treatment program dimension)이 활성화된 병동으로 지각하였다. 3) 두 병동의 치료환경을 비교한 결과 개방병동이 더 치료적임 병동으로 나타났으며, 개방병동은 자율적인 문제해결에 중점을 두고 있는데 반하여, 폐쇄병동은 환자의 보호에 중점을 두고 있었다. 또한 이러한 두 병동이 환경차이에 직원보다는 환자가 더 민감하게 반응하였다. 결 론 : 결론적으로는 병동에서 환자들에게 다양한 현실적인 프로그램을 제공할 수만 있다면, 대부분 만성 정신질환자가 입원된 정신과 전문병원에서 개방병동이 하나의 바람직한 치료유형으로서 대안이 될 수 있음을 볼 수 있었다. Objective : The treatment setting of mental hospital has a great influence on the outcome of treatment. The authors compared the characteristics of treatment setting of the open and the closed wards in a mental hospital and the attitudes of the staff and patients on each ward. Methods : Total four wards two typical open wards and two typical closed wards were selected and each contained one ward and one female ward. Ward Atmosphere Scale (WAS) was conducted to each and the mean scores of suscales of WAS were compared by using Student's t-test. Results : 1) The closed ward was similar to the treatment of control-oriented program which stresses the staff control and the rule of ward and ignores the autonomy of patient and such a evaluation was perceived more by the patients than by the staff. 2) The open ward supported and encouraged the staff and patients and focused on solving the practical problems of the patients, and especially the staff perceived it as the treatment program the activated ward. 3) It was shown that the open ward was more therapeutic and while it focused on the autonomous problem solving, the closed ward pup enguasis on the protection of patients. In addition, the patients were sensitive to the difference of setting between the two wards than the staff. Conclusion : In conclusion, if various and realistic programs were offered to the patients in the ward, the open ward would be proposed as a desirable therapeutic form for the chronic psychiatric inpatients.

딕카이트로부터 스멕타이트의 수열합성

류경원,장영남,배인국,채수천,최상훈 한국광물학회 2004 광물과 암석 (J.Miner.Soc.Korea) Vol.17 No.3

딕카이트[Al₂Si₂O_(5).(OH)₄]를 출발물질로 사용하여 이팔면체형 스멕타이트를 수열합성하였다. 시료를 활성화시키기 위해 Na₂O 성분을 첨가하고 800℃에서 4시간 열처리하였다. 합성실험을 Na-0.7 바이델라이트의 화학반응식에 의한 화학양론적 조성에 따라 SiO₂성분을 첨가하였으며 300℃, 70 ㎏f/㎠ 이하의 조건에서 온도, 압력, 시간 등을 변화시키면서 실험을 수행하였다. 합성실험을 위해 약 1리터 용량의 밀폐형 강철재 압력용기를 사용하였다. 스멕타이트를 합성할 수 있는 최적 조건은 반응온도 290℃, 반응시간 48시간, pH 10 및 60 ㎏f/㎠ 의 압력조건인 것으로 확인되었다. 온도, 압력조건 외에 원료물질의 활성화, 반응시간, 반응용액의 초기 pH 등은 결정도에 영향을 미치는 주요 요인으로 작용하였다. 합성결과물에 대한 X-선 회절분석, 에틸렌글리콜 처리, 'Greene-Kelly' 측정법 등의 실험결과, 합성된 스멕타이트는 Na-바이델라이트임이 확인되었다. A hydrothermal process was used to synthesize dioctahedral smectite from dickite [Al₂Si₂O_(5).(OH)₄]. Dickite was previously activated by heating at 800℃ for 4 hours with Na₂CO₃. After the heat-treatment, Sift was added for stoichiometrv. The autoclaving was carried out in closed stainless steel vessel (about 1 liter) at the condition of various temperature, pressure, time etc. High quality smectite could be obtaind by heating at 290℃ under the pressure of 60 ㎏f/㎠ for 48 hours. This experiment reveals that pH of the solution was an important factor and should be maintained at 10 to 11 for the formation of dioctahedral smectite. Be synthesized smectite was identified as Na-beidellite by the treatment of ethylene glycol and Greene-Kelly test.

매체순환식 가스연소기 적용을 위한 Ni계 및 NiO계 산소공여입자의 반응특성

류호정,배달희,조성호,진경태 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1

매체순환식 가스연소기에 적용하기 위한 최적의 산소공여입자를 결정하기 위해 금속산화물(NiO)의 함량 변화에 따라 네 가지 (NiO 26, 44, 58, 78wt%)의 산소공여입자를 제조하여 열중량 분석기에서 환원반응특성을 측정 및 비교하였다. 제조된 입자들 중에서 NiO 약 60wt%인 입자가 산소전달능력 및 반응속도 면에서 다른 입자들에 비해 우수한 성능을 나타내었다. 산소공여입자의 제조과정에서 금속산화물 형태의 영향을 살펴보기 위해 금속산화물의 출발물질로 Ni과 NiO를 사용하여 NiO 함량이 동일한(약 60%) 두 종류의 입자를 제조하였으며 열중량 분석기와 고정층 반응기를 이용하여 반응속도, 재생성, 환원반응 유지시간 및 CO_(2) 선택도 등을 측정 및 고찰하였다. 금속산화물의 출발물질로 NiO를 사용한 입자가 Ni을 사용한 입자에 비해 반복 실험시에 정상반응조건에 빨리 도달하였고 반응속도와 CO_(2) 선택도가 높았으며 환원반응 유지시간인 길게 나타났다. 실험결과에 의해 본 연구에서 고려한 산소공여입자 중에서 금속산화물의 출발물질로 NiO를 사용한 NiO 함량이 60wt%인 입자를 최적의 산소공여입자로 선정하였다. To find a suitable oxygen carrier particle for chemical-looping combustor, four kinds of particles (NiO 26, 44, 58, 78wt%) were prepared and the reactivity of the reduction was measured and investigated by a thermo-gravimetrical analyzer. From the viewpoint of oxygen transfer capacity and reaction rate, the particle containing 60wt% of NiO showed better performance than the other particles. Also, we have prepared two kinds of oxygen carrier particles to investigate the effect of the starting material for a metal oxide component(i.e., Ni based and NiO based particles, where the weight percents of both samples were set at 60wt% as NiO). The reaction rate, regenerative ability, duration of the reduction, and CO₂ selectivity were easured and investigated by a thermo-gravimetrical analyzer and a fixed bed reactor. The results obtained here indicated that the NiO based oxygen carrier particle containing 60wt% of NiO showed better regenerative ability, reaction rate, CO₂ selectivity, and duration of the reduction, compared with the other particles, therefore we selected this particle as an optimum oxygen carrier particle.

매체순환식 가스연소기 산소공여입자의 최소유동화속도 및 고속유동층으로의 전이유속

류호정,임남윤,배달희,진경태 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5

기포유동층과 고속유동층의 2탑 연결 가압순환유동층으로 조업되는 매체순환식 가스연소기의 설계와 조업조건 선정을 위해 산소공여입자의 최소유동화속도와 고속유동층으로의 전이유속을 측정 및 고찰하였다. 층물질로 매체순환식 가스연소기의 산소공여입자인 NiO/bentonite (평균입경 : 0.181 mm, 입자밀도 : 4,080 kg/㎥)를 사용하여 가압 기포유동층(내경 0.052 m, 높이 1.66 m)에서 층압력강하를 측정하여 온도(25-1,000℃)와 압력(1-6 atm)의 변화에 따른 최소유동화속도의 변화를 측정 및 고찰하였고 고온순환유동층(내경 0.02 m, 높이 2.0 m)에서 emptying time method에 의해 고속유동층으로의 전이유속(U_(tr))에 대한 온도(25-600℃)의 영향을 측정 및 고찰하였다. 측정된 최소유동화속도는 온도와 압력이 증가함에 따라 감소하였으며, 고속유동층으로의 전이유속은 온도가 증가함에 따라 증가하였다. 최소유동화속도와 고속유동층으로의 전이유속에 대한 본 실험의 측정값을 기존의 상관식과 비교하였으며 기존 상관식을 바탕으로 수정된 상관식을 제시하였다. In order 10 design and select appropriate operating conditions for the practical operation of chemical-loaping combustor, which consists of two interconnected fluidized beds (bubbling fluidized bed and fast fluidized bed), minimum fluidization velocity and transition velocity to fast fluidization were measured and investigated. Oxygen carrier particle of NiO bentonite particle (specific surface mean diameter: 0.181 mm, particle density: 4,080 ㎏/㎥) was used as a bed material. The minimum fluidization velocity was determined by measuring the bed pressure drop in the pressurized fluidized bed (0.052 m i.d. and 1.66 m high) with variations of temperature (25-1,000℃) and pressure (1-6 atm). The transition velocity from bubbling to fast fluidization was determined by means of emptying tim method in the high temperature circulating fluidized bed (0.02 m i.d. and 2.0 m high) with variation of temperature (25-600℃). The measured minimum fluidization velocity was increased with increasing temperature and pressure. The measured transition velocity to fast fluidization was increased with increasing temperature. The previous correlations on the minimum fluidization velocity and transition velocity to fast fluidization were compared with the present measured values to develop new correlation.

Polymorphisms in Apoptosis-Related Genes and <i>TP53</i> Mutations in Non-Small Cell Lung Cancer

Bae, Eun Young,Lee, Eun Jin,Kang, Hyo-Gyoung,Lee, Shin Yup,Jin, Gwang,Lee, Won Kee,Choi, Jin Eun,Jeon, Hyo-Sung,Lim, Jeong Ok,Lee, Eung Bae,Park, Jae Yong The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.11

<P>Apoptosis plays an essential role in the elimination of mutated or transformed cells from the body. Therefore, polymorphisms of apoptosis-related genes may lead to an alteration in apoptotic capacity, thereby affecting the occurrence of <I>TP53</I> mutations in lung cancer. We investigated the relationship between potentially functional polymorphisms of apoptosis-related genes and <I>TP53</I> mutations in non-small cell lung cancer (NSCLC). Twenty-seven single nucleotide polymorphisms in 20 apoptosis-related genes were genotyped by a sequenome mass spectrometry-based genotyping assay in 173 NSCLCs and the associations with <I>TP53</I> mutations in the entire coding exons (exons 2-11), including splicing sites of the gene, were analyzed. None of the 27 polymorphisms was significantly associated with the occurrence of <I>TP53</I> mutations. This suggests that apoptosis-related genes may not play an important role in the occurrence of <I>TP53</I> mutations in lung cancer.</P>

Genetic Algorithm-assisted optimization of partially dyed-TiO₂ for room-temperature printable photoanodes of dye-sensitized solar cells

Bae, Eun Gyoung,Kim, Hyunho,Hwang, Yun-Hwa,Sohn, Kee-Sun,Pyo, Myoungho The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.2

<p>The processing parameters for photoanodes that are printable in a room-temperature (RT) continuous process for dye-sensitized solar cells (DSCs) were optimized by the use of Genetic Algorithm (GA). The photoanodes were prepared at RT from mixtures of partially dyed-TiO<SUB>2</SUB> (PDT) with various sizes and dye-loadings and were subsequently compressed for the fabrication of PDT films with different compositions, nanoporous structures, and thicknesses. According to our decision parameter design, there were 2<SUP>20</SUP> different cases, from which only 30 chromosomes for each generation were selected for the testing of photovoltaic performance to determine the global optimal point in power conversion efficiency (<I>η</I>). After 7 generations (<I>i.e.</I>, only 210 chromosomes tested out of 2<SUP>20</SUP>), <I>η</I> reached 6.02%, which was 22% higher than the value reported previously without the aid of a GA. The photoanode composed of a mixture of 14, 21, and 40 nm TiO<SUB>2</SUB> with different dye-loadings and compressed to a thickness of 8.0 μm under 94 MPa showed the highest <I>η</I> (short circuit current = 12.03 mA cm<SUP>−2</SUP>, open circuit voltage = 685 mV, fill factor = 72.8%). A comparison of the photovoltaic parameters and characteristic charge transport properties revealed that sparsely dyed small TiO<SUB>2</SUB> provided an efficient electron transport route to increase the short circuit current. The role of large TiO<SUB>2</SUB> dyed up to monolayer coverage, on the other hand, was also disclosed to partially increase the short circuit current by light scattering. We hope that the GA-assisted photoanode optimization, presented here, will encourage new directions in research while providing an efficient RT printing process for the continuous fabrication of DSCs.</p> <P>Graphic Abstract</P><P>To realize a continuous RT printing process of DSCs, the composition and processing parameters of photoanodes composed of partially dyed-TiO<SUB>2</SUB> were optimized, reaching a 6 % efficiency. <img src='http://pubs.rsc.org/ej/JM/2011/c1jm14416b/c1jm14416b-ga.gif'> </P>

Binder-free Sn/Graphene Nanocomposites Prepared by Electrophoretic Deposition for Anode Materials in Lithium Ion Batteries

Bae, Eun Gyoung,Hwang, Yun-Hwa,Pyo, Myoungho Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.4

Nanocomposites consisting of Sn nanoparticles and graphene oxide (GO) were electrophoretically deposited onto Cu current collectors that was used for anodes in Li ion batteries (LIBs). In order to optimize the electrochemical performance of nanocomposites as an anode material by controlling the oxygen functionality, the GO was subjected to $O_3$ treatment prior to electrophoretic deposition (EPD). During thermal reduction of the GO in the nanocomposites, the Sn nanoparticles were reduced in size, along with the formation of SnO and/or $SnO_2$ at a small fraction, relying on the oxygen functionalities of the GO. The variation in the duration of time for the $O_3$ irradiation resulted in a small change in total oxygen content, but in a significantly different fraction of each functional group in the GO, which influenced the Sn nanoparticle size and the amount of SnO (and/or $SnO_2$). As a result, the EPD films prepared with the GO that possessed the least amount of carboxylic groups (made by treating GO in an $O_3$ environment for 3 h) showed the best performance, when compared with the nanocomposites composed of untreated GO or GO that was $O_3$-treated for a duration of less than 3 h.