대나무 활성탄의 산 개질이 납과 구리 이온의 흡착에 미치는 영향

이명은ㆍ정재우(Myoung Eun LeeㆍJae Woo Chung) 유기성자원학회 2016 유기물자원화 Vol.24 No.1

질산과 염산에 의한 대나무활성탄(bamboo-based activated carbon, BAC)의 개질이 Pb(Ⅱ)와 Cu(Ⅱ)의 흡착특성에 미치는 영향을 규명하기 위해 회분식 흡착실험을 수행하였다. 산 개질에 의해 BAC의 탄소함량은 감소하고 산소함량은 증가하며 pH는 감소하는 것으로 나타났다. 염산에 의한 개질은 BAC에 뚜렷한 표면 작용기를 첨가시키지 않았으나 질산에 의한 개질은 카르복실기와 OH 작용기를 첨가시키는 것으로 나타났다. BAC와 산으로 개질된 BAC의 중금속 이온 흡착속도는 2차 속도모델에 의해 적절하게 설명될 수 있는 것으로 나타나 흡착반응의 속도가 물리적 흡착보다는 흡착제와 금속이온들 사이의 전자들의 공유나 교환을 포함하는 화학적 흡착에 의해 결정되는 것으로 나타났다. 실험에 사용된 모든 흡착소재의 등온흡착특성은 Langmuir와 Freundlich 모델에 의해 적절하게 설명될 수 있으며 BAC의 염산에 의한 개질은 중금속 이온의 흡착용량에 큰 영향을 미치지 않으나 표면작용기를 첨가시킨 질산에 의한 개질은 Pb(Ⅱ)와 Cu(Ⅱ)의 흡착용량을 각각 36.0%와 27.3% 증가시키는 것으로 나타났다. Effects of acid (HNO3 and HCl) modification on the adsorption properties of Pb(Ⅱ) and Cu(Ⅱ) onto bamboo-based activated carbon (BAC) were investigated through a series of batch experiments. The carbon content increased and oxygen content decreased with acid treatment. HNO3 induced carboxylic acids and hydroxyl functional groups while HCl added no functional group onto BAC. The pseudo-second order model better described the kinetics of Pb(Ⅱ) and Cu(Ⅱ) adsorption onto experimented adsorbents, indicating that the rate-limiting step of the heavy metal sorption is chemical sorption involving valency forces through sharing or exchange of electrons between the adsorbate and the adsorbent. The equilibrium sorption data followed both Langmuir and Freundlich isotherm models. The adsorption capacities of BAC were affected by the surface functional groups added by acid modification. The adsorption capacities were enhanced up to 36.0% and 27.3% for Pb(Ⅱ) and Cu(Ⅱ), respectively by the HNO3 modification, however, negligibly affected by HCl.

정보시스템 서비스의 종합적 품질평가모형에 관한 연구

이명호,윤재욱,이경근 한국경영과학회 1999 한국경영과학회지 Vol.24 No.3

Recently, information technology and information system(IS) are rapidly diffused throughout the world. In the global competitive environment, the success of IS becomes the important on e among the critical success factors(CSF) of the firm. For achieving it, the firm must continually involve itself in the quality evaluation and improvement of IS. The quality concept was changed into the customer-oriented quality one. There is no exception to the quality of IS. In the past, IS quality was determined by the IS developer or IS department offering service. Now it is evaluated by the user of IS service, and then the customer-oriented user satisfaction becomes an important issue. The purpose of this study is to develope the total quality evaluation model of IS through TQM approach First, all success factors of the domestic IS are extracted from the foreign and domestic literatures of IS success factors contained the technical and behavioral aspects. And the extracted factors are classified with evaluation levels for quality evaluation and developed into a total quality evaluation model. Finally the model usefulness is analyzed.

노출형 원형강관 주각의 축압축 가력실험

이태규,이명재 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

The object of this study is to investigate the structural behavior of circular tube column bases under the axial load. Nine specimens of column bases were conducted for tests. And the column base design methods of AISC were investigated by literature survey. Test results were summarized load-displacement relationships, load-strain relationships, and load-relative displacement relationships of base plates.

냉수 가글링과 젖은 거즈를 이용한 구강간호가 비강수술 환자의 갈증 및 구강상태에 미치는 효과 비교

이인선,심명숙,나은희,강재연,김지혜,황민영,윤계숙,성영희 병원간호사회 2006 임상간호연구 Vol.11 No.2

Purpose: This study researched the comparison of oral care methods between the wet gauze and the water gargling for nasal surgery patients. It executed to find out more effective method to relieve thirst. Method: We divided two groups; the wet gauze and the cold water garaling. We assessed patient's oral cavity state and sebjective oral dryness for three times; firstly before the intervention, secondly 15 minutes after 1st intervention and thirdly 15 minutes afrer 2nd intervention. Result: As the intervention, there was no difference on oral condition subhectvely, but there was a difference on thirsty reduction objectively. As the aral dryness has relieved through both methods. It showed the repeated gargling helps more to relieve oral dryness effectively than the wet gauge. At PACU, post nasal surgery patient's oral dryness was decreased with gauze more than two times, patient's oral dryness was relieved. Whereas the dryness was relieved after applying the cold water gargling for just one time. Conclusion: The water gargling is more effective intervention than the wet gauze. Especially, oral dryness was improved in the section of objetive oral assessment index.

강성사면에 인접한 옹벽의 거동에 관한 연구

이명욱,유남재,박병수 江原大學校 産業技術硏究所 1998 産業技術硏究 Vol.18 No.-

This thesis is an experimental and numerical research on beating capacity acting retaining walls close to rigid slopes with stiff angles. Experiments were performed with changing the roughness of adjacent slope to the wall, its inclination, distance between wall and slope. Vertical stress and applied surcharge loads were measured by miniature earth cells and a load cel respectively. Stress distribution Vertical Settlement of surcharge of rigid model footing were measured by LVDTs. Bearing capacities of surcharge loads were compared with theoretical estimations by using several different methods of limit equilibrium and numerical analysis. For limit equilibrium methods, the modified silo and the wedge theories, proposed by Chung sung gyo and Chung in gyo(1994) were used to analyze test results Based on those modified theories, the particular solution with the boundary condition of surcharge loads on the surface of backfill was obtained to find the stress distributions acting in the backfill and to compare with test results. From results of surcharge test with model wall being very close to the slope, analyzed results by the modified silo theory and to be in the better agrements than other methods.

포스포늄염을 포함하는 가교 고분자의 제조 및 그들의 감습특성

이칠원,공명선,이승재 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

고습도 또는 결로시 내수성을 지니는 저항형 습도센서를 제조하기 위하여 vinylbenzyl tributyl phosphonium chloride를 포함하는 4원 공중합체를 합성하여 저습도와 고습도 범위에서 측정이 가능한 습도센서용 감습막을 제작하였다. 1,5-dibrompentane과 4차 염화 가교 반응을 통하여 최종 저항형 습도 센서를 제작하였다. 감습막은 알루미나 기판에 한 쌍의 금 paste가 인쇄된 전극을 사용하였으며, 감습막은 다양한 비율의 vinylbenzyl tributyl phosphonium chloride, 2-(dimethylamino)ethyl methacrylate, 2-ethylhexyl acrylate, 그리고 [2-(methacryloyloxy)ethyl]trimethyl ammonium chloride등을 이용하여 제조하였다. 감습막은 micro-syringe를 이용하여 도포하였으며 건조 oven에서 50 ℃에서 6 시간 동안 가교반응을 진행하였다. 습도센서의 임피던스 특성은 2-(dimethylamino)ethyl methacrylate 또는 [2-(methacryloyloxy)ethyl]trimethyl ammonium chloride의 함량이 증가할수록 감소하였다. vinylbenzyl tributyl phosphonium chloride / 2-(dimethylamino)ethyl methacrylate / 2-ethylhexyl acrylate / [2-(methacryloyloxy)ethyl]trimethyl ammonium chloride의 조성비가 4/4/1/1인 공중합체의 경우 30∼90%RH 범위에서 2.64 MΩ ∼ 3.11MΩ 의 임피던스 특성을 보였으며 우수한 직선성과 낮은 히스테리시스 나타내었다.

병원이용 빈도와 진료수익성 분석을 통한 외래환자 시장세분화

이명선,이장재 朝鮮大學校 統計硏究所 2007 統計硏究所論文誌 Vol.9 No.1

The research objective is segmenting outpatients for CRM in medical service. Using modified RFM(Recently, Frequency, Monetary) method based on frequency and profitability in the hospital, the data were analyzed with the data mining technique. The result can be summarized as follows : The outpatients were semented into the four groups:1) the loyal patient group, who have kept visiting until recently and giver high profitability, 2) potential loyal patient group, who give lower profitability but high frequency of use, 3) potential withdrawer patient group, who have lower frequecy of use but give high profitability and: 4) withdrawer patient group, who give low frequency of use and have not visited recently.

폐 내 병변으로 인한 소아 급성 호흡부전의 원인 질환과 예후

이혜영,박지숙,최희라,서지현,김점수,임재영,최명범,박찬후,우향옥,윤희상 대한소아과학회 2004 小兒科 Vol.47 No.5

골수구성 백혈병 환자에게 발생한 결핵성 림프절염

이창섭,송진수,최평균,조재현,방지환,박경화,박완범,김홍빈,김남중,윤성수,박선양,김병국,오명돈,최강원 대한감염학회 2006 감염과 화학요법 Vol.38 No.5

혈액질환 가운데 결핵 발생이 증가한다고 알려진 것은 호지킨 림프종을 포함한 림프증식성질환 그리고 모양세포성 백혈병 등이 있다. 또한 동종 골수이식을 받은 환자에서도 결핵은 증가한다고 알려져있다. Kaplan 등은 골수구성 백혈병 환자에서 결핵 발생이 증가한다고 보고하였다. 그러나 골수구성 백혈병 환자에서 결핵의 발생이 증가하는 이유에 대해서는 아직까지 정확하게 밝혀지지 않았다. 저자들이 2년 동안 후향적으로 조사한 180명의 성인 골수구성 백혈병 환자들 가운데 결핵이 발생한 환자는 4명이었고, 발생 부위는 모두 림프절이었다. 결핵은 골수구성 백혈병의 특정 아형에만 국한되어 발생하지 않았지만, 50%에서 FAB 분류에 의한 M4였다. 림프절이 종대된 골수구성 백혈병 환자에서 특히, 결핵의 유병율이 높은 나라에서는 결핵성 림프절염도 감별진단에 포함시켜야 한다. During the neutropenic phase, leukemia patients receiving chemotherapy are prone to bacterial and, fungal infections; occasionally mycobacterial, viral and protozoal organisms may also cause infections. Mycobacterium tuberculosis infection was reported very rarely in these patients. This report describes four patients with M. tuberculosis infection identified from 185 adult patients who were diagnosed myelogenous leukemia between January 2003, and December 2004. There was no patient with M. tuberculosis infection from 44 lymphoid leukemia and 11 acute biphenotypic leukemia patients. Sites of infection were all lymph nodes. Three among four patients were presented with lymphadenopathy at initial diagnosis of leukemia, and the other one presented with lymphadenopathy after induction chemotherapy. There was no patient presented with lymphadenopathy during the neutropenic phase. Tuberculous lymphadenitis was presented in a patient with three acute myelogenous leukemia (FAB class 2 M4, 1 M2) and a chronic myelogenous leukemia, accelerated phase. An acute myelogenous leukemia patient had a leukemic cell and tubercle bacilli in the same lymph node. Tuberculosis should also be included as a differential diagnosis in myelogenous leukemia patient with lymphadenopathy, especially in the countries in which the disease is endemic.

작업효율을 만족하고 작업량 평준화를 고려한 작업자할당 방법에 관한 연구

이홍철,안재명,김성식 한국경영과학회 1997 韓國經營科學會誌 Vol.22 No.4

The problem addressed in this paper is to minimize the deviations of workloads assigned to worker and to maximize the total utilizations(degree of skill) between workers and machines simultaneously. Each worker can handle the set of machines with the different degree of skill and each machine has the workloads needed to be processed. Also, each worker has to be assigned to at least one machine with the minimum workload deviation. This problem can be formulated as a preemptive goal programming with generalized assignment constraints. The proposed algorithm consists of two phases. First, a capacitated circulation network is constructed to assign the workers to machines with the maximum total utilizations while considering workloads balance. Then, a refinement process is applied to the split machines to satisfy the feasibility condition. The real industrial application in a plastic extrusion manufacturer is included along with several computational experiments.