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정성택,박종남,조규재 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
CFRP composite has a lot of merits such as mechanical characteristic, light weight, and thermal resistance. For these merits CFRP is applied to so many industrial area. In this paper, the relationship between the stack thickness and drill diameter is examined from the drilling experiment, which is the drilling of 16, 32, 48plies specimen with the φ8, φ10, φ12mm cemented carbide drill. The results are analyzed with consideration of cutting force, stack thickness and drill diameter.
정성택,박종남,조규재 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.6
CFRP composite has a lot of merits such as mechanical characteristic, light weight, and thermal resistance. For these merits CFRP is applied to so many industrial area. In order for the composite materials to be used in the air& structures or machine elements, accurate surfaces for bearing mounting or joints must be provided, which require precise machining. In this paper, the relationship between the stack thickness and drill diameter is examined from the drilling experiment, which is the drilling of 16, 32, 48plies specimen with the φ8, φ10, φ12mm cemented carbide drill. The results are analyzed with consideration of cutting force, stack thickness and drill diameter.
정성택,박종남,김선진,조규재 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
In recent days the more use of CFRP composite is in the airplane, automobile, and sport goods, etc., the more necessity of research on it in this engineering. In this research, the CFRP composite specimen are fabricated by 48 CFRP plies with 8 orientation angles, and the specimens are drilled with 3 tools. The results are analyzed with consideration of cutting force, type of tools and fabrication condition. The specimens with each drilling conditions are also investigated with SEM. The optimal drilling conditions such as drill types and cutting force with respect to the fabricating condition are studied.
정성택,박종남,조규재,심재기 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
In recent days the more use of CFRP composite is in the airplane, automobile, and sport goods , etc., the more necessity of research on it in this engineering. In this research, the CFRP composite specimen are fabricated by 48 CFRP plies with 6 stacking sequences, and the specimens are drilled with 4 tools. The results are analyzed with consideration of cutting force, type of tools and fabrication condition. The specimens with each drilling conditions are also investigated with SEM. The optimal drilling conditions such as drill types and cutting force with respect to the fabricating condition are studied.
效率的인 環境敎育을 위한 敎授·學習方法의 改善에 關限 硏究 : 中學校를 中心으로 in Middle School
김현철,이택순,문병현,서규태 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1
This paper focuses on the development of desirable curriculum for environmental education in middel school. From the questionnaire investigation for teachers and students of 10 middle schools in Gyeongnam-do, it is desirable that the eduaction program should be practical and experiential rather than the current cramming lecture. In addition, environmental education program should be introduced as a compulsory subject through continuous and systematic curriculum. A training program is necessary for specialist group teaching environmental issues too. Institution of regional environmental education center is an appropriate meausre to develop such program. It will be helpful for open communication between school and social community. National support is necessarily required to promote research activity and to develop innovative teaching materials in such center. Consequently the national environmental network will be constructed and effective environmental education will be implemented.
최미리,서규태,문병현,이택순 7개 국립대학교 환경연구 논문집 공동발행 위원회 2003 공업기술연구 Vol.3 No.-
This study was to investigate the cause of the color and turbidity in a small-scale water treatment plant using lakes water as water supply source. Water qualities in aqueducts, in depth of the lakes and in each process were measured. And effects of prechlorination on each unit operation in the water treatment, especially on iron and manganese removal, were studied. The concentration of iron and manganese was 0.13, 0.08 mg/L in the surface water and 1.93 and 0.433 mg/L in 15 m depth of the lake. Higher iron concentration of the inlet was measured to 5.35 mg/L which was caused by the steel aqueduct corrosion. The optimun coagulation dosages of Poly Aluminum Chloride(PAC) and Liquid Aluminum Sulfate (LAS) were 17.5 mg/L and 35 mg/L. Pretreatmnet of raw water with CaCOl improved the removal efficiencies of iron and manganes. However, more efficient method for removing iron and manganes was required.
참지식 부직포여과 활성슬러지 시스템의 가정 오수처리 적용 타당성 조사 연구
임태진,서규태,이택순,문병현 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1
An experimental study was conducted to investigate the applicability of non-woven fabric filter as an alternative separation material in membrane combined activated sludge process. The most advantage of the fabric filtration activated sludge system is the low operation and maintenance cost resulting from the ready available material and gravity filteration. The system was consisted of two reactors, anoxic and aerobic one with working volume of 0.28㎥ and 0.47㎥, respectively. The non-woven fabric filter module was immersed in the aerobic compartment for separation of activated sludge by gravity filtration. Although the system showed high potential to treat domestic wastewater the initial leakage of bio-solid from the reactor and reduction of permeate flux were main problems of the system. The initial flux of 0.4㎥/㎡/day reduced to 0.2㎥/㎡/day in 12 days operation at 133㎝ water head. During the stable operation period, average SS concentration of effluent was 1.8㎎/L showing 96.4% removal. Organic removal efficiency was 98.3% as COD_Cr and 91.6% as BOD with the effluent concentration, 14.4㎎/L and 1.5㎎/L, respectively. T-N removal efficiency was 60% at C/N ratio 4.5.
윤혜정,서규태,이택순 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
The corrosion rate of copper pipe used in distribution system was studied in presence of chloride, sulfate and fluoride ions, respectively. It was compared with test results using mixtures of sulfate and chloride at concentrations similar to those of tap water in Gyeongnam area. The corrosion rate of copper pipe was higher in the presence of sulfate than chloride showing two fold higher rate. In contrast copper concentration in synthetic water containing chloride was rather higher than in the presence sulfate. Fluoride was generally considered less aggressive toward corrosion of pipes, but corrosion rate and the concentration of copper were relatively large values. During potentiostatic anodic polarisation a relatively large current was producted in the chloride containing solutions.
폐타이어 담체를 이용한 유동상 생물막공정의 고도처리 효율에 관한 연구
송창열,이택순,서규태,문병현 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
Organic and nutrient removal was investigated in a full scale fluidized phase biofilm process of 800m-(3)/day using waste tire media for domestic wastewater treatment. Various internal reciculation ratio was set as an operation condition to enhance nitrogen removal efficiency. The process operation results are as follows. Significantly high removal efficiency above 94% could be obtained by the biofilm process in terms of organics(BOD&COD_(Mn)) and suspended solid(SS). Relatively low nitrogen removal of 53% was observed at the internal recycling 100% of influent flow rate. However the removal efficiency could be increased to 70% at 200% internal recycling. The process showed also considerably high T-P removal efficiency of 80% producing effluent concentration of 0.68mg/L for 3.38mg/L influent.
이춘수,서규태,문병현,이택순 7개 국립대학교 환경연구 논문집 공동발행 위원회 2003 공업기술연구 Vol.3 No.-
This study was performed for water quality management of Yonggi Lake Park in Changwon City. The results are as follows; The water quality of the lake was deteriorated during summer season because of algal blooming. It was estimated that existing treatment capacity of the lake water was not sufficient to meet the target lake water quality. And so the lake water circulation period, 40 days should be shorten to below 30 days by increasing the treatment capacity. Fountain and air supply facilities for 02 supply and mixing caused rather resuspension of solid settled at the bottom of the lake. It was also evident that the extended detention of water in the lake resulted in water quality deterioration. Consequently it is important to supply high quality water from other sources. Especially lower temperature water had better effect on improvement of the water quality.