영양제로서 결정 NH₄H₂PO₄를 첨가한 피혁 공장 폐수의 생물학적 처리

전명순,임병란,최기덕,이수구 서울산업대학교 산업대학원 1993 大學院論文集 Vol.2 No.-

피혁 공장 폐수의 생물학적 처리에 있어서 유입 폐수의 급격한 부하변동, 독성물질의 유입 및 미생물의 성장에 필요한 각종 영양소의 불균형 등으로 인해 처리효율이 낮고 운전관리상 어려움이 많다. 따라서 본 연구에서는 피혁공장 폐수의 생물학적처리효율을 높이기 위하여 각종 영양제의 주입에 따른 처리효과에 관한 실험을 실시하여 적절한 영양제를 선정하고, 최적 주입량 등을 결정 하였다. 실험대상 폐수는 반월공단내의 피혁 공단 폐수로서 중화 및 응집참전 밥법으로 전처리 한 후 포기조에 유입되는 폐수를 대상으로 하였다. 영양제로는 회분식 실험에서 피혁폐수의 처리효율이 가장 우수한 것으로 나타난 결정 APM (ammonium phosphate monobasic, NH₄H₂PO₄)을 이용하였다. 연속식 활성 슬러지 공장에 있어서 폐수의 유량, 슬러지 반송율, 결정 APM 주입량 등을 변화시켜 그에 따른 처리효율에 미치는 영향을 실험 고찰하였으며, 생물 반응공학적인 반응해석을 통하여 설계에 필요한 반응상수 등을 구하였다. 연속식 활성슬러지법에서체류시간 12시간의 조건에서 영양제 미주입시 BOD 제거효율은 68%에 불과하였으나, 영양제로서 요소와 인산을 주입한 경우 73%로 증가하였으며 결정APM을 주입한 경우 90% 이상의 높은 처리율을 얻을 수 있었다. 결정 APM의 최적 주입량은 회분식 실험의 경우 300㎎/L이었으나, 연속식 실험의 경우 50㎎/L로 낮게 나타났는데, 이는 반송되는 슬러지내의 높은 인농도와 미량원소에 기인한다. 결정 APM을 50㎎/L 주입한 후 수리학적 체류시간을 6∼30 시간의 범위로 변화시켜 실험한 결과, BOD 제거효율은 체류시간 6시간에서는 67%에 불과하였으나, 12시간의 경우 93%, 30시간의 경우 98%이었다. 따라서 BOD제거효율 90%이상을 얻기 위해서는 수리학적 체류시간은 11시간 이상, F/M비는 0,65 ㎏ BOD/㎏ MLVSS·d 이하로 운전하여야 하는 것으로 나타났다. This study was performed to enhance the treatment efficiency of leather wastewater adding APM(ammonium phosphate monobasic, NH₄H₂PO₄) crystal as nutrient which contained the sufficient mineral components. The effect of APM crystal on biological treatment were studied and its optimum dosage and kinetic coefficients were determined. In the continuous activated sludge system for field wastewater of Banwol leather complex, BOD removal efficiency could be obtained over 90% with adding APM crystal, while it was 68% without nutrients and 73% with urea and phosphoric acid in the condition of HRT 12hr and SRT 3 days. The optimum dosage of APM crystal was 50㎎/L which was low compared with 300㎎/L in batch test due to recycling sludge contained high content of phosphate and mineral nutrients. In the condition of adding APM crystal 50㎎/L and hydraulic retention time in the range 6∼30hr, BOD removal efficiencies were 67% for HRT 6hr, 93% for 12hr and 98% for 30hr. In order to obtain over 90% of BOD removal efficiency, HRT should be maintained over 11 hr and F/M ratio within 0.65 ㎏ BOD/㎏ MLVSS·d.

유비쿼터스 컴퓨팅에 관한 소고

방기천 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.2

The revolution of ubiquitous has been achieved at the united space of on-line and off-line through the intelligent combination which is carried out between physical and cyber space. The space of cyber is able to create new ubiquitous room by natural combination with life space. The space is the mysterious world as well as the unlimited space of opportunity which human beings have not experienced yet. The purpose of this study is to research the results of project which have been accomplished by each country and to study the current situation of the technique of ubiquitous computing which has been progressed. It is likely to occur the many cases that violate individual privacy at the world which is possible to communicate with codeless equipments. It is expected this research to be a basic data to prepare for the world of ubiquitous to be coming in the future.

副腎皮質 腺腫을 同伴하는 原發生 Aldosteronism

이기형,전정열 慶熙大學校 1983 論文集 Vol.12 No.-

A 41-year-old-woman with hypertension and hypokalemia underwent adrenalectomy for primary aldosteronism, She was found to have and adenoma in right adrenocortical region on pathologic result. The diagnosis was made by finding low plasma renin activity, which could not be stimulated, and unsuppresable elevated plasma or urin aldosterone. The localization of an adenoma was accomplished by adrenal angioraphy, venography ultrasonogram, and CT. The CT was more helpful to identify the localization of the tumor than other radiologic studies. The patient was recovered completly from hypertension and hypokalemia after operation.

EPx 자동생화학분석기와 컴퓨터간의 양방향 통신 시스템 구축

박기현,전효진 啓明大學校 醫科大學 1995 계명의대학술지 Vol.14 No.4

It has been understand that a laboratory information system(LIS) plays an important role in a hospital information system(HIS). However, few HIS has been equipped with a fully automated LIS. This is partly because, in order to achieve a fully automated LIS, there are many testing equipment has its own communication protocol. In this paper, a bi-directional communication system between an ABBOTT SPECTRUM EPx auto-chemical analyzer and a PC is constructed. With the communication system, it is possible that a PC controls an EPx's operations and that the PC receives test results form the EPx automatically. RS-232C serial ports are used in order to make bi-directional communication possible between them

극한 표면의 근접거리 메트릭을 이용한 적응적 Loop메쉬분할법

방기천 남서울대학교 1999 남서울대학교 논문집 Vol.5 No.-

This paper proposes the adaptive Loop subdivision using the closeness distance of limit surface that is defined by the distance between newly created vertex and its limit position. The closeness distance metric can be applied to all approximation schemes, and we can get the result which is close to the limit surface by adaptively subdividing of initial mesh according to users input bound using this metric. Moreover, adaptive Loop subdivision that is proposed in this paper can be applied effectively to multiresolution representations or mesh editing schemes that use Loop subdivision.

실시간 스트림 방식을 이용한 웹기반 원격 교육 시스템

방기천 남서울대학교 2001 남서울대학교 논문집 Vol.7 No.-

A number of remote education systems are trying to offer the video, but they did not acquire satisfiable results because of limited network bandwidth. In this paper, we propose a web-based remote education system using the real stream methods. Currently, in remote education systems, they are implemented about the instruction and learning among the manager, instructor and learner, In addition to the system, we had them constitute a user integrated community and smoothly exchange their opinions between them in cyber space. We imported a feed-back system between the instructor and learner, fed back the result of learning to the learner and constituted the conversation channels between them.

유비쿼터스 환경에서의 정보보호

방기천 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.1

The ubiquitous computing environment can cause greater problems than the existing computing environment if data is not securely preserved. In order to create a secure and reliable ubiquitous computing environment, it is necessary not only to consider technical matters and development of ubiquitous, based on the existing research on cyber and physical space, but also to suggest a strategic policy for the protection of privacy, information and security. This study aims to look into the ubiquitous computing environment, which is a new technical environment, and suggest preventive measures against possible problems of the ubiquitous computing environment.

그래픽 기법을 이용한 분산분석

방기천 남서울대학교 1995 남서울대학교 논문집 Vol.1 No.-

In this paper, we present the implementation of graphical method to analyse the AOV type data. Representing the data graphically is better to explore the patterns and the features of the data than just summarizing the data numerically.

멀티미디어 CBT 시스템의 효과적인 활용을 위한 고찰

방기천 남서울대학교 1997 남서울대학교 논문집 Vol.3 No.-

A multimedia CBT system is the educational training system which conveys the educational contents and is utilized as an evaluating instrument. Because there is individual studies through the interaction between computer and learners, we can achieve the effectiveness of education more highly and can adjust the level of studies depending upon individual capability. Multimedia CBT system utilizes a variety of media, so it enlightens the intent of learners, higher than the exiting CBT system and it has higher effectiveness in transmiting information. Although many people has recognized the advantage of CBT system, there were not many uses because of difficulties in installing computer and in developing coursware. I have illustrated the fields of hardware, software, courseware and the like to utilize the CBT system more effectively. To take advantage of multimedia system as an educational instrument, we should not just focus upon the uses of mechanical function, and should not provide educational program just for entertainment. Considering theoratical background of CBT system systematically, it should be directed to maximize the function of newmedia.

이황화탄소 폭로가 혈압과 콜레스테롤치에 미치는 영향

洪起天,李恩一,金光鍾 고려대학교 의과대학 1994 고려대 의대 잡지 Vol.31 No.3

To study the effects of exposure to carbon disulfide on blood pressure and serum cholesterol level, we gathered the informations from file of the periodic health examination for occupational disease, the periodic health examination for general disease and medical records in, Wonjin factory clinic. The study subjects were 266 workers who had worked in spinning department as exposure group, and 207 male office workers and 59 female office workers as non-exposure group. The results are as follows; 1. The slope coefficients of systolic blood pressure(as dependent variable) and age and exposure duration(as independent variable) were 0.013 and 0.066 respectively in exposure group. And the slope coefficients of diastolic blood pressure(as dependent variable) and age and expoure duration(as independent variable) mere 0.010 and 0.051 respectively in expoure group. 2. The slope coefficients of systolic blood pressure(as dependent variable) and age and tenure duration(as independent variable) were 0.019 and 0.009 respectively in male unexposure group, and were 0.032 and 0.018 respectively in female unexposure group. And the slope coefficients of diastolic blood pressure(as dependent variable) and age and tenure duration(as independent variable) were 0.016 and 0.009 respectively in male unexposure group, and were 0.019 and 0.033 respectively in female unexposure group. 3. The slope coefficient of exposure duration was greater than that of age in exposure group and that of age was greater than that of tenure duration in male unexposure group. 4.There was no significant difference of blood pressure between the exposure and non-exposure group. 5.The slope coefficients of Serum cholesterol(as dependent variable) and age and exposure duration(as independent variable) were 0.03 and 0.035 respectively in exposure group. The slope coefficients of serum cholesterol(as dependent variable) and age and tenure duration(as independent variable) were 0.102 and -0.012 respectively in male unexposure group. And the slope coefficients was very low in female unexposure group. 6. The slope coefficient of exposure duration was similar to that of age in exposure group, and only age was positively related to serum cholesterol in male unexposure group.