비누화 PC88A에 의한 NdCl₃와 SmCl₃용매추출의 화학모델

이만승,이광섭,이진영,김성돈,김준수 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.10

A chemical model was developed to estimate equilibrium constant for the solvent extraction of Nd and Sm from chloride solution with saponified PC88A. The model could be employed to predict the distribution coefficient of metal from the initial extraction conditions. The model consisted of chemical equilibria, mass balance, charge balance and solvent extraction reaction. By applying the model to the experimental conditions and data, equilibrium constants for the solvent extraction of Nd and Sm were obtained. The effect of the saponification of PC88A on the extraction of Nd was explained in terms of the equilibrium constant obtained in this study and the change of equilibrium pH. The predicted distribution coefficients of Nd and Sm agreed well with those measured. (Received July 14, 2004)

염산용액에서 TBP에 의한 FeCl₃ 용매추출의 평형

이만승,이광섭 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.8

Solvent extraction equilibria of FeCl_(3) from chloride solutions with TBP were analyzed by considering chemical reaction, mass balance, charge balance and extraction reaction. The activity coefficients of solutes in the aqueous phase were calculated by Bromley equation. Extraction reaction of FeCl_(3) with TBP in the experimental range of this study was determined from the dependence of the distribution coefficient of FeCl_(3) on the chloride ion concentration. By applying ionic equilibria to the results of solvent extraction, equilbrium constant of the extraction reaction was estimated to be 3.43×10^(2). The equilibrium concentrations of solutes in both phases after extraction could be calculated with the ionic equilibria developed in this study. The predicted concentrations of Fe in the aqueous phase after extraction agreed well with those experimentally measured.

염산용액에서 비누화 PC88A에 의한 용매추출로 Gd와 Sm의 분리

이만승,이광섭,이진영,김성돈,김준수 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.5

Solvent extraction experiments have been performed to separate Gd and Sm from chloride solution with PC88A and saponified PC88A. The effects of extraction conditions on the distribution coefficients of Gd and Sm were investigated. The distribution coefficients of Gd were higher than those of Sm in the experimental ranges of experimental conditions of this study. A solvent extraction model was developed to predict the distribution coefficients of metals and separation factor between Gd and Sm from the initial extraction conditions. The measured distribution coefficients of Gd and Sm with PC88A and saponified PC88A showed good agreements with the predicted values. (Received March 3, 2005)

염산용액에서 PC88A에 의한 Sm의 용매추출

이만승,이광섭,이진영,김성돈,김준수 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.10

Solvent extraction experiments of Sm were performed from chloride solution with PC88A and saponified PC88A. Solvent extraction reaction of Sm with PC88A and the corresponding equilibrium constant were evaluated from the experimental and ionic equilibria data as follows Sm^(3+)_(aq)+ 1.5H₂A_(2,org)= SmA_(3,org)+ 3H^(+)_(aq) , K = 0.33. The predicted distribution coefficients of Sm agreed well with the experimental results. The distribution coefficients of Sm with saponified PC88A and the values of equilibrium pH depended on the initial extraction conditions. When the concentration of PC88A was in excess of that of Sm, saponification of PC88A greatly enhanced the extraction of Sm. (Received June 21, 2004)

조직 구성원이 보유한 형식지와 암묵지의 조직소유인식에 관한 탐색적 연구

장시영,이정섭,오만석 한국경영과학회 2004 經營 科學 Vol.21 No.1

Today's organizations make every effort to achieve effective knowledge management, under the recognition that knowledge is a powerful, competitive weapon. For knowledge management to be successful, however, not only should knowledge be voluntarily offered by organizational members but also the organizational ownership of knowledge be perceived among members. In this regard, this study explores antecedent factors of organizational ownership of knowledge based on the extension of previous studies. The analysis of two hundred and fifty-five survey data indicates that cohesion of department or team, propensity to share, and task interdependence are significantly related to organizational ownership. The relationship turns out to be stronger with tacit knowledge than with explicit knowledge. Some suggestions are proposed for enhancing effective knowledge management.

TPM 을 활용한 공공프로젝트 관리의 개선방안

김주섭,이만형 충북대학교 건설기술연구소 2000 建設技術論文集 Vol.19 No.1

This study develops theoretical frameworks based on Total Project Management (TPM) methods and applies computer-aided TPM programs to the public arena. It implies that the current practices hinged on passive or limited tactics should be replaced with the TPM strategies which are initiated in the private sector. That is, the major problems of the existing project management can be summarized as the indirect and unilateral systems, the restrictive scopes, and non-scientific management activities. In contrast, the TPM focuses on total management among diverse functions covering the early stage of suggestion up to the post-operation. 'Therefore, both information-sharing and total management activities are possible within the TPM system. For these purposes, an independent organization operation and composition is essential. Furthermore, it also proposes the harmonized structure among areas of scope, quality, cost, time, risk, communication, resources, and procurement management. At the same time, the study finds that roles of negotiators or arbitrators to accommodate diverse opinions among various interest groups are prerequisite for the suitable application of the TPM strategies in the public sector. This thesis presents two-phased practical policy alternatives. Compared with the traditional management activities depending on the hierarchical structure between expert groups and public authorities, the alternative operation of special task force teams is recommendable if the public sector has the sufficient capacities to handle projects in the long run. In specific, the wide application of computer-aided program is the most promising and reliable because it can guarantee the scientific and objective management from the beginning of project design. In order to evaluate the feasibility of program application, the thesis examines a real example dealing with the time-schedule management in Cheong-ju Bongmyong-Shinbong Land Rearrangement Project. As shown in the case study, a series of analyses using management programs can make it possible to quantify risk factors within the total networks, which are also supplemented by additional information for the necessary rescheduling. In addition, the public authority can utilize the management program to simplify the complicated factors concerned with public projects. Nonetheless, it should be kept in mind that the final decision is man-made, not machine-made: we can only be supported by the public decision-making information.

Clinical Characteristics and Treatment Outcomes of Chronic Pulmonary Aspergillosis: a Retrospective Analysis of 70 Patients

( Byung Woo Jhun ),( Kyeong Man Jeon ),( Jung Seop Eom ),( Ji Hyun Lee,),( Gee Young Suh ),( Man Pyo Chung ),( O Jung Kwon ),( Won Jung Koh ) 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.-

Backgroud: Chronic pulmonary aspergillosis (CPA) is uncommon and there are few data on the clinical characteristics, optimal therapeutic strategies, and outcomes. Methods: We retrospectively reviewed the records of patients with newly diagnosed CPA and assessed the clinical, radiologic, and laboratory responses, and outcomes between January 2008 and January 2012. Results: A total of 70 CPA patients were included. Median age was 55 years and 51 patients (72.9% ) were men. Fifty-seven patients (81.4%) had a history of pulmonary tuberculosis and 32 patients (45.7%) had non-tuberculosis mycobacterium (NTM) lung disease, 17 of whom had a history of NTM treatment and 15 was under NTM treatment. Sixty-nine patients (98.6%) received oral itraconazole, except one with oral voriconazole for a median duration of 6.2 months. Symptomatic improvement occurred in 52 patients (74.3%), radiologic improvement occurred in 29 (41.4%), and laboratory tests improved more than 60% of all patients. Thirty-six patients (51.4%) achieved treatment success, defined as symptomatic improvement after at least 6 months of therapy regardless of radiological improvement, and 4 of whom needed retreatment after a median of 8.4 months. There was no difference in clinical characteristics and outcomes according to NTM status and 10 (14.3%) discontinued therapy due to adverse reactions. Death occurred in 10 (14.3%) and median follow-up duration was 11.2 months. Conclusion: Antifungal therapy for about 6 months and reassessment of disease might be feasible treatment strategy in managing patients with CPA.

췌장을 침습한 위의 암육종 1 예

김병호,김효종,조진만,김윤화,이정일,동석호,장영운,황일섭,장 린 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.1

Carcinosarcoma of the stomach is regarded as a rare malignant neoplasm composed of both carcinomatous and sarcomatous components in a given tumor. Few cases have been reported since 1904. This is a case of carcinosarcoma of the stomach in a 61-year-old man. He suffered from indigestion, vomiting, and epigastric pain. Endoscopic finding showed a huge protruding mass with intact mucosa on the posterior wall of the antrum up to the pylorus. Surgery was performed and carcinosarcoma with pancreatic invasion was confirmed by pathology.

A 565 MBIT/S Single Mode Optical Transmission System

Man Seop Lee,Jun Am Hwang,Yong Hwan Kim,Min Ho Kang 대한전자공학회 1987 TENCON 87 - Computers and Communications Technolog Vol.- No.-

Solvent Extraction of Gd from Chloride Solution with PC88A

Lee, Man-Seung,Lee, Gwang-Seop,Lee, Jin-Young,Kim, Sung-Don,Ahn, Jae-Woo,Kim, Joon-Soo The Japan Institute of Metals 2005 MATERIALS TRANSACTIONS Vol.46 No.2

<P>Solvent extraction experiments of Gd from chloride solution with PC88A were conducted at different extraction conditions. Solvent extraction reaction was identified from the experimental results using a graphical method, and the corresponding effective equilibrium constant was determined by analyzing the ionic equlibria in a GdCl<SUB>3</SUB> solution. In the experimental ranges investigated in this study, <I>i.e.</I>, [GdCl<SUB>3</SUB>]≤0.3 kmol/m<SUP>3</SUP>, [PC88A]<SUB>org</SUB>≤3.0 kmol/m<SUP>3</SUP> and initial pH≤2.3, solvent extraction reaction of Gd with PC88A and the corresponding effective equilibrium constant were obtained as follows Gd<SUP>3+</SUP>+2H<SUB>2</SUB>A<SUB>2,org</SUB>=GdA<SUB>3</SUB>HA<SUB>org</SUB>+3H<SUP>+</SUP>, <I>K</I><SUB>ex,eff</SUB>=2.8×10<SUP>−1</SUP>.</P>