석탄회를 이용한 석탄광산 폐기물의 안정화 효율성 평가

오세진(Se-Jin Oh),김성철(Sung-Chul Kim),고주인(Ju-In Ko),이진수(Jin-Soo Lee),양재의(Jae E. Yang) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6

본 연구는 다량의 중금속을 함유하는 폐석탄 광산에 적치된 폐석으로부터 발생하는 침출수의 안정화를 위해 석탄회를 안정화제로서의 적용성을 평가하는데 목적이 있다. 석탄폐석에 석탄회를 적용하여 컬럼시험을 수행한 결과는 다음과 같다. 1) 석탄회의 pH는 비산재와 바닥재가 각각 11.1, 9.7의 강알칼리성을 갖는 것으로 나타나 강산성 조건의 폐석 (pH 3.5)를 교정하였으며 유기물을 비롯하여 식물생장에 필요한 영양소인 인산, 칼슘 등을 함유하는 것으로 나타나 폐석과 혼합할 경우 비옥도가 개선될 수 있을 것으로 판단된다. 2) 폐석만을 충진한 컬럼에서 발생하는 침출수의 pH는 3.5~4.0의 수준을 시험기간 동안 지속적으로 유지하는 것으로 나타나지만, 석탄회의 처리량에 따라 40% (pH 5.0~6.0) 〉 20% (pH 4.5)로 나타나고, 동일 처리량 (40%)의 처리방법에 따른 효율성은 완전혼합 (pH& & 5.0~6.0) 방법이 층위처리 (pH 4.0~4.5)에 비해 pH 상승효과가 높은 것으로 조사되었다. 3) 침출수의 Ca과 Mg의 함량은 4 pore volume까지 빠르게 용탈되다 그 이후부터 안정화 되었으며 석탄회에서 용탈된 Ca과 Mg의 영향으로 폐석에 함유되었던 Cu, Pb, As, 및 Al 등이 탄산이온 (CO₃<SUP>2-</SUP>) 또는 수산화이온 (OH-)과 불용성 화합물을 형성하여 안정화 되는 것으로 사료된다. 4) 철의 용존함유량에 대한 분석결과 석탄회 처리구의 용존량이 석탄회를 40% 층위처리한 처리구를 제외하고 대조구에 비해 약 8-74% 정도 감소하는 것으로 조사 되었다. 5) 석탄회를 이용한 폐석의 중화 및 철의 용존량 감소 효율성을 평가한 결과 폐석의 중화 효율성은 석탄회를 40% 완전혼합한 경우 가장 높았으며 철의 용존량 감소 효율성은 석탄회를 20% 완전혼합한 경우가 가장 좋은 것으로 조사되었다. 따라서 석탄회를 이용하여 현장에서 폐석을 처리할 경우 약 20-40%의 석탄회를 처리해야 높은 효율성을 얻을 수 있을것으로 사료된다. In this study, coal combustion ash (CCA) was evaluated for its stabilization effect on acidic mine waste with column experiment. Total of six treatments were installed depending on mixing ratio between coal wastes and CCA (0, 20, 40%) and mixing method (completely mixing and layered). Artificial acidic rain (pH 5.6) was used for feeding solution with flow rate of 0.05 mL min<SUP>-1</SUP>. Result showed that higher pH of leachate was observed as more CCA was mixed. The highest pH in leachate was measured when 40% of CCA was mixed with coal waste (pH of 5.8). Also, complete mixing with CCA and coal waste was more effective to increase the pH of leachate than layered treatment. Regarding the reduction of soluble Fe amount, the highest efficiency (78%) was observed when 20% of coal ash was completely mixed with mine waste. Based on those result, optimum mixing ratio of coal ash with mine waste can be ranged 20-40% depending on environmental circumstances in the field.

Acrylonitrile-Styrene 공중합체의 합성 및 열적성질에 관한 연구

양정성,오세찬,성용길 慶南大學校 附設 基礎科學硏究所 1989 硏究論文集 Vol.1 No.-

Ammonium peroxidisulfate was used as an initiator in the free radical polymerization of acrylonitrile. Benozyl peroxide was used as an initiator in the free radical polymerization of styrene and in the free radical copolymerization of styrene with acrylonitrile. The synthesized polymers and copolymers have been identified by FT-IR spectrophotometer. The thermal properties and glass transition temperature(Tg) of the polymers and copolymers were measured by differential scanning calorimetry and thermogravimetry. The activation energies of thermal decomposition for the polymers and copolymers were evaluated from the thermogravimetric data by Freeman and Carroll method.

컴파일러 중간언어에 관한 연구

오세만,이양선,박진기 동국대학교 1986 論文集 Vol.25 No.-

최근의 프로그래밍 언어와 기계구조의 급격한 발전은 컴파일러의 자동생산을 요구하게 되었고, 이에 따라 컴파일러의 설계에도 많은 진보가 이루어졌다. 대부분의 컴파일러에서, 원시코드는 기계코드 보다는 중간코드로 번역이 되며 그 중간코드는 특정기계의 목적코드로 번역된다. Syntax-directed방법으로 원시언어에서 기계언어로 직접 번역도 가능하다. 그러나 우리는 중간언어를 사용함으로 해서 몇가지의 이점을 얻을 수 있다. 첫째로 컴파일러의 구성을 서로 독립적인 두 부분으로 나눌 수 있고, 두 번째로 컴파일러의 portability를 한층 더 높일 수 있다. 그리고 세 번째로 중간언어단계에서 기계와 독립적인 optimization을 할 수 있다. 실제규모의 컴파일러를 설치하는 데 있어 중간언어의 선택은 중요한 문제이다. 이 논문에서는 네가지의 중간언어를 다루었고 각 중간언어의 특징을 중간언어의 기준에 비추어 설명하였다. Recently, the programming languages and machine architectures are proliferating. This has led to automate the production of compilers. So much progress in the design of compilers has been made. In most compilers, the source code is translated into an intermediate code rather than machine code. And then the intermediate code is targetted to a specific machine. It is possible to translate directly from source to machine language in a syntaxdirected way. But we can obtain a munber of advantages by use of an intermediate language. They are: (1) The construction of a compiler can be split into two independent phases. (2) The portability of a compiler can be enhanced. (3) A machine independent optimization can be performed at the intermediate language level. The problem of intermediate language selection is very important in implementing a practical scale compiler. In this paper, four kinds of intermediate language are examined and the characteristics of each intermediate language are described according to some criteria.

수율 최적화를 통한 GaAs MMIC 주파수 혼합기 설계

오세홍,양승인 崇實大學校 生産技術硏究所 1995 論文集 Vol.25 No.1

We designed a mixer for PCS receiver in MMIC which promises small chip size by high integration and low cost. Because the mixer was designed by cascoding two single gate MESFETs, we could not only obtain reasonable LO/RF isolation, but also need only a drain - gate bias. The mixer circuit was implemented including transmission lines connecting between components and bonding wire interfacing between the mixer circuit and the chip outside circuit. The circuit design and layout were cone by using HP-EEsof Libra, Academy and Simulatable Artwork Library developed in M/W lab., Soong Sil Univ. Yield analysis was implemented with ±5% parameter variations because MESFET and passive device, which were provided in ETRI Foundry, have some fabrication tolerance. As the results, we obtained initially 77% yield and the Sensitivity Histograms show high sensitivity of yield according to the parameter variations. So, we did the yield optimization, As a result the yield was raised by 13% and the sensitivity becomes dulled. At the final circuit, when the current dissipation is 7mA with 3V drain bias and LO power is 0dBm, the following performances were obtained ; conversion gain > 3.5dB, LO/RF isolation > 16dB, LO/IF isolation > 18dB, 1dB gain compression point = -5.5 dBm(input), third order intercept point = 8.8 dBm(output). The layout chip size becomes 1.5㎜ × 1.5㎜. The mixer would be useful for PCS receiver thanks to its small chip size and low current dissipation.

GMAHN 환경에서의 TCP 프로토콜 성능 분석

吳世德,金玄旭,李光培,張良根,裵振勝,金在浩 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

Recently, GMAHN that provides interface between MANET and Wired Network has been focused in Mobile Communication. It is necessary that The technology provide reliable data transmission technology between mobile node and wired network in MANET environment that varing by the node movement. In this paper, using the TCP protocol(Tahoe, Reno, Vegas, SACK)that increases reliability between source and destination, we applied the TCP protocol mechanism to various environment, and compared result, and also proposed the efficient TCP mechanism by comparing each mechanism.

미세혈관 수술후 Urokinase투여효과에 관한 실험적 연구

이세일,오석준,김용성,양경무 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.1

However, even the most technically perfect anastomosis can neither eliminate the damage which microneedles cause on the vascular endothelium nor foreign body reaction to the suture material. Thrombosis developed at the suture site and regressed if the stimulus for the thrombosis is not severe. Partial thrombosis was inevitable after microvascular anastomosis. Since systemic thrombolytic drugs were used initially in the management of pulmonary emboli, urokinase were also used in prevention of thrombolysis and thrombolysis after microvascular anastomsis. This experimental study includes the effect of urokinase on the microvascular anastomosis in rabbits. The patency was observed, and platelet count, fibinogen, prothrombin time, and activated partial thromboplastim time were examined. In the case of thromboses, the anastomotic sites were resected and examined microscopically. The results were as follow; 1. The patency rate was increased 15 percent in experimental group than control group. 2. There were no differences in platelet count and the prothrombine time between experimental and control group. 3. The level of fibrinogen was decreased 157㎎/dl in experimental group less than control group. 4. The activated partial thromboplastin time was increased three to four times at postoperative period more than preoperative period in experimental group. 5. In light microscopic examination of thrombotic vessel wall revealed inflammatory reaction to suture material. In the experimental group, the thrombi were loose and defibrinated than control group.

Global-MAHN에서 라우팅 오버헤드 개선에 대한 연구

張良根,金玄旭,李光培,吳世德,裵振勝,金在浩 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

In this Paper, we studied the mechanism that increases the network reliability and decreases network load in GMAHN environment based on the AODV routing protocol. This proposed algorithm is the research on the algorithm, minimizing network overhead by preventing unnecessary network overhead previously and adapting Local repair mechanism to efficient data transmission when route error happens in network, in GMAHN environment. To evaluate the proposed algorithm's performance, we analyzed the proposed algorithm and adapting in various experiment environment according to 5 experiment viewpoint such as node movement, gateway network zone, mobile node number, flow number. After evaluating the experiment, we confirmed better network improvement altogether through following result such as total average data reception rate's increase, average data transmission time's decrease, network overhead's decrease than existing GMAHN algorithm.

허혈성 장질환의 조기진단을 위한 혈청 락테이트(lactate)의 유용성

이미진,오동렬,박규남,김세경,양진홍,박상현 대한응급의학회 2000 대한응급의학회지 Vol.11 No.4

Background: Intestinal ischemia remains a devastating event despite improvements in clinical recognition and in diagnostic and therapeutic modalities. The ischemic bowel diseases encompass a wide clinical spectrum from mild, reversible disease to severe, irreversible injury. The clinical picture is characterized initially by poorly localized visceral pain. Thus, it is difficult to diagnose this ischemia at an early stage. This study investigated whether an increased serum lactate level is a recognized danger signal marker for intestinal ischemia in patients who present at the emergency department because of abdominal complaints. Methods: Patients who came to our emergency department with abdominal pain and the risk factors of intestinal ischemia between Apr. 1999 and Nov. 1999 were included in this study. The data analysis included age, sex, final diagnosis, pathogenesis of bowel ischemia, and serum lactate level. Results: The serum lactate level in the intestinal ischemia group was 28.54±22.51 mg/dl; in non-ischemia group, it was 15.49±22.52 mg/dl. This difference between the two groups was significant(p<0.05). An increased serum lactate level had a sensitivity of 88.2% and specificity of 59.2%, a positive likelihood ratio of 4.92, and a negative likelihood ratio of 0.47 as a marker of bowel ischemia. These results do not represent a very meaningful revision of bowel ischemlc provability, but may make a small contribution to management of the disease, depending upon their magnitude and the clinical context in which they are applied. Conclusion: In patients with abdominal complaints, an increased serum lactate level is usually a useful aid as a diagnostic marker of bowel ischemia.

GMAHN 환경에 적응하는 에러 복구기능을 이용한 AODV 라우팅 프로토콜

정찬혁,오세덕,배진승,이기원,장양근,이광배,김현욱,유충렬,하재승 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-

Mobile nodes in ad hoc mobile networks typically communicate over wireless channels and are capable of movement. These are networks that support multihop communication and can be formed on a temporary basis. This paper proposes a solution that allows mobile nodes to access the wired Internet and to roam from base station to base station. And we also develop the efficient method that adapts in Global MANET which can be changed over time. It is observed that we can reduce not only error detection time but also network load, thus increasing the data reception rate in Global MANET Environment.

Wolff-Parkinson-White증후군의 임상상 및 전기생리학적 소견

안신기,이문형,장양수,오동진,최인석,하종원,임세중,김병옥,정남식,심원흠,조승연,김성순 대한순환기학회 1997 Korean Circulation Journal Vol.27 No.9