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석탄회로 합성한 제올라이트에 대한 암모니아성 질소 흡착특성 조사
류완호,이원묵,백일현,배장순 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4
국내 석탄화력 발전소에서 폐기되는 석탄회를 이용하여 폐수 중 암모니아성 질소 제거용 흡착제를 제조하고자 NaOH를 반응물로 한 수열합성 반응을 이용, 제올라이트를 합성하였으며 제조된 제올라이트를 실제공정에 활용하기 위하여 흡착실험 및 공정모사를 수행하였다. 또한 흡착제를 구형으로 제조하여 암모니아성 질소의 등온 흡착 공정에 이용하였으며 이 결과 Langmuir식에 잘 일치함을 알 수 있었다. 고정층에서의 흡착 거동은 축 방향 분산흐름, 입자 내부에서의 표면 확산 및 Sips 흡착 등온식을 바탕으로 한 고정층 흡착모델의 주요 공정 변수에 대한 파과곡선을 잘 모사할 수 있음을 확인할 수 있었다. Zeolite was synthesized from coal fly ash produced by a domestic power plant and applied for the removal of ammonia from waste water. Zeolite was synthesized using a hydrothermal method involving an akaline reaction with NaOH, and adsorption experiments and simulations were conducted. Adsorption experiments with the pelletized spherical zeolite were carried out. The experimental data obtained from adsorption isotherms agreed well with the Langmuir equation. Also, most of the correlated results for the fixed bed model based on surface diffusion and Sips adsorption isotherms equation were consistent with the experimental data.
Inconel 718 상향 엔드밀링시 절삭력에 미치는 공구형상오차의 영향
이영문,양승한,장승일,백승기,김선일,이동식 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.5
In an end milling process, the undeformed chip section and cutting forces vary periodically with the phase change of the tool. However, the real undeformed chip section area deviates from the geometrically ideal one owing to the cutter runout and tool shape error. In the current study, a method of estimating the real undeformed chip section area which reflects the cutter runout and tool shape error is presented during up-end milling processes of Inconel 718. The specific cutting forces, K_r and K_t are defined as the radial and tangential cutting forces divided by the modified chip section area, respectively. Both of the K_r and K_t values become smaller as the helix angle increases from 30˚ to 40˚. Whereas they become larger as the helix angle increases from 40˚ to 50˚. The K_r and K_t values show a tendency to decrease with increase of the modified chip section area.
2003년 국내 중증급성호흡기증후군 진료 현황 및 문제점 분석
이진수,김은실,정문현,백제중,정선화,안주희,최영화,이선희,고철우,김성범,김민자,박승철,기현균,송재훈,최상호,김양수,이상오,조용균,박영훈,정숙인,김연숙,이흥범,손창희,장성희,정희진,김우주 대한감염학회 2004 감염과 화학요법 Vol.36 No.3
목적 : 2002년 말 중국에서 SARS가 발생한 이후 국내에서도 2003년 10월까지 총 3명의 추정환자, 17명의 의심환자가 보고되었다. 향후 추가적인 SARS의 유행이 우려되는 상황에서, 그간의 SARS 환자 진료에 있어서의 실질적인 준비사항, 진료 현황 등에 대한 조사를 통해 문제점을 파악하여, 향후 더 나은 대비가 될 수 있도록 개선점을 제시하고자 하였다. 재료 및 방법 : SARS로 의심되는 환자를 진료 경험이 있는 병원의료진을 대상으로 2003년 10월에 설문조사를 실시하였다. 설문에는 SARS 환자 진료 시의 실질적인 조치, 진료 현황, 병실, 응급실 및 외래에서의 격리 시설과 준비사항, 보건당국의 관리와 지원에 관한 사항을 포함하였다. 결과 : 대상이 되는 22개 병원 중 17개(17/22, 77.2%) 병원이 설문에 응하였다. SARS 환자를 위한 격리실은 응급실, 외래, 일반병실 및 중환자실에서 각각 9개(9/17, 52.9%), 5개(5/17, 29.4%), 15개(15/16, 93.7%), 4개(4/16, 25%) 병원에서 음압처리가 되어있지 않은 일인실 혹은 다인실이 사용되었고, 1개(1/16, 6.3%) 병원에서만 일반병실에서 음압격리실이 운영되었다. 입원환자의 진찰 시 개인보호구의 착용은 거의 모든 의료기관에서 이루어졌다. 보건당국에서 SARS지정병원의 시설 등을 사전에 확인한 곳은 1곳(1/12, 8.3%)이였고, 14개 병원(14/15, 93.3%)에서는 보건당국에 의뢰한 검사결과를 통하 받지 못하였다. 결론 : 의료기관에서 SARS 환자용 격리실뿐만 아니라 기존의 격리실 설비 등이 미흡하였으며, 특히 중환자실 및 외래의 준비가 더욱 부족하였다. 보건당국의 의료기관에 대한 종합적인 지원이 부족하였고, 병원과의 원활한 연계가 잘 이루어지지 않았다. SARS 만이 아닌 격리를 필요로 하는 질환의 적절한 진료를 위해 향후 병원 시설의 정비와 정부차원에서의 보다 구체적이고 실질적인 대책마련이 필요하다. Background : There was an worldwide outbreak of the Severe Acute Respiratory Syndrome (SARS) originated from China in late 2002. During that period three cases of suspected SARS and 17 cases of probable SARS were reported in Korea. With the concerns about the reemergence of SARS-coV transmission, it is important to be prepared for any possibility. So, this study is aimed to analysis the past measures in managing SARS and propose the amendatory plans to improve the preparedness. Materials & Methods : Questionnaires were collected among clinicians with any experience in managing the probable or suspected SARS cases in Oct. 2003. 17 out of 22 hospitals responded to the questionnaire. The contents in the questionnaire were practical activities, personal equipments, response plans, isolation facilities in emergency centers, outpatient clinics, general wards and intensive care units, and relationship with the public health department. Results : The dedicated isolation rooms in emergency centers, outpatient clinics, general wards, and intensive care units were prepared in 9 (9/17, 52.9%), 5 (5/17, 29.4%), 15 (15/16, 93.7%), and 4 (4/16, 25.0%) hospitals, respectively. Except for one hospital that newly made negative pressure room for SARS, single or multi-bed rooms without airborne infection control were used in all the other hospitals. The personal precaution principles were kept quite well in general wards. Before the designation of SARS hospital by the public health department prior evalution to see if the hospital was suitable for managing SARS was conducted in only 1 (1/12, 8.3%) hospital. The results of laboratory diagnosis were reported back in 1 (1/15, 6.6%) hospital. Conclusions : The isolation facilities which can control airborne infection were almost deficient not only for SARS but also for other respiratory transmissible diseases. For the infection control of transmissible diseases including SARS, more investment is needed on medical facilities and comprehensive support from the public health department required.
태양광 발전의 효율 향상을 위한 새로운 태양추적 알고리즘 개발
최정식(Jung-Sik Choi),고재섭(Jae-Sub Ko),강성준(Sung-Jun Kang),백정우(Jeong-Woo Baek),장미금(Mi-Geum Jang),김순영(Sun-Young Kim),정동화(Dong-Hwa Chung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
This paper proposes a novel solar tracking algorithm for improving of photovoltaic(PV) efficiency with tracking method. A novel solar tracking algorithm calculates the global latitude and longitude of earth with sun. Also, it considers the refraction of atmosphere, annual oscillation and perturbation of moon. Proposed algorithm is applied the PV generation unit with tracking method and observes the azimuth and altitude. Observed data compare to korea astronomy observatory and conventional position solar algorithm(PSA) data and analyzes the accuracy. Therefore, the validity of this paper proves by analyzed data.
Jang, Hae-Sun,Lee, Hae-Rim,Koo, Bon-Sang,Jeon, Eun-Ok,Han, Moo-Sung,Min, Kyung-Cheol,Lee, Seung-Baek,Bae, Yeonji,Cho, Sun-Hyung,Mo, Jong-Suk,Kim, Jong-Nyeo,Mo, In-Pil The Korean Society of Poultry Science 2014 韓國家禽學會誌 Vol.41 No.3
While use of mass rearing systems improved poultry production, chances of exposing to contagious diseases have been increased, making flocks more vulnerable to diseases. Diseases of interest which affects egg production adversely include Low pathogenic avian influenza (LPAI), Infectious bronchitis (IB), Avian meta-pneumoviral infection (aMPV) and Egg drop syndrome'76 (EDS'76). This report collected and analyzed 5,385 serum samples, which were collected from 1,330 different chicken flock, provided by Chungbuk National University, Avian Disease Laboratory at 2009. Serums were analyzed based on rearing stages; 0~1.3weeks (wks) (maternal antibody period), >1.3~3 wks (starting period), >3~10 wks (growing period), >10~22 wks (developing period), >22~40 wks (peak laying period), >40~60 wks (late laying period) and over 60 wks (post-molting period). Results showed the 99.7% of the tested flocks were immunized against ND and73.8%, 97.1%, 78,2% and 78% of the flocks were immunized against other 4 agents (LPAI, IB, EDS'76, aMPV). Maternal antibody was transferred to enough quantity for NDV. Generally, antibody titers which were developed at 22 weeks were stabilized permanently for life. In case of IB and aMPV, infection titer emerged as early as 10 weeks and the titer was increased from 99.4% to 100% for life. EDS76 showed increase in titers, reflecting decreased frequency of vaccination programs. Overall, this study displayed general trends of major viral disease in layers, but considering the trend of development of preventive measures and evolution of pathogens, conducting serological surveys on a regular basis is important.
A Generalized Likelihood Ratio Test in Outlier Detection
Jang Sun Baek(백장선) 한국통계학회 1994 응용통계연구 Vol.7 No.2
본 연구에서는 핵확산 감시와 관련된 이상점 탐지를 위한 일반화 우도비 검정 방법이 개발되었다. 고전적인 이상점 탐지방법들이 연속형 변수만을 고려한 반면, 본 연구에서 제안된 방법은 연속형 변수, 이산형 변수, 혹은 이산형과 연속형이 혼합된 변수들에 모두 적용될 수 있다. 더우기 대부븐의 고전적인 방법들에 있어서 주로 이용된 정규분포 가정을 필요로 하지 않는다. 본 연구에서 제안된 방법은 일반화 우도비에 붓스트랩 방법을 적용하여 구성되었다. 모의실험을 통하여 검정력을 고찰함으로써 제안된 검정방법의 성능을 연구하였다. A generalized likelihood ratio test is developed to detect an outlier associated with monitoring nuclear proliferation. While the classical outlier detection methods consider continuous variables only, our approach allows both continuous and discrete variables or a mixture of continuous and discrete variables to be used. In addition, our method is free of the normality assumption, which is the key assumption in most of the classical methods. The proposed test is constructed by applying the bootstrap to a generalized likelihood ratio. We investigate the performance of the test by studying the power with simulations.