室內수영장의 水質檢査에 의한 실험적 연구 : KMnO₄ 소비량과 Cl^(-)값 間의 相關關係 Correlation between KMnO₄demand and Cl^(-) values

이징연 대구보건대학 1992 대구보건대학 論文集 Vol.13 No.-

This study was performed to get some basic data in order to maintain the healthful water quality in the indoor swimming pool. The results are summarized as follows : 1. Correlation of KMnO₄ Demand and Cl^(-) values was r=0.9844 in Adult pool, r=0.9858 in children pool. 2. The relation equation of KMnO₄ Demand with time in Adult pool was log y=0.047 log x+0.8702, the relation equation of Cl^(-) with time in Adult pool was log y=0.041 log x+1.631. 3. The relation equation of KMnO₄ Demand with time in children pool was log y=0.090 log x+0.9475, the relation equation of Cl^(-) with time in children pool was log y=0.055 log x+1.91. 4. The supply water quantity was desirable alout 36㎥ to maintain with KMnO₄ Demand 12 p.p.m in a pool for children of 300 persons per day.

共沈현상을 이용한 폐수중의 微量 Cr^(+6)의 처리를 위한 연구

이징연 대구보건대학 1992 대구보건대학 論文集 Vol.13 No.-

This study is to investigate the removal efficiency of Cr^(+6) from waste water by using the coprecipitation phenomena. Experiments were performed mainly by using the jar tester at pH range of 8 to 11. Cr^(+6) concentration was 1㎎/ℓ with different concentrations of ammonium ferrous sulfate, which were 5 to 100㎎/ℓ as Fe^(+2). Following conclusion were obtained from the results of this study. Removal efficiency was highly improved compared to the conventional hydroxide precipitation treatment. The optimum conditions for Cr^(+6) removal is at pH range of 9 to 10 and over the ratio(㎎/ℓ Fe^(+2)㎎/ℓCr^(+6)) of 5. The added So₄^(-2) at pH range of 5 to 6 improved on the coprecipitation of Cr^(+6). The added Ca^(+2) at pH range 10 to 11 improved on the coprecipitation of Cr^(+6).

스포츠에 대한 환경학적 연구의 의의와 과제

이징연(Jing-Yeon Lee),이정식(Jung-Sik Lee) 한국환경관리학회 1998 環境管理學會誌 Vol.4 No.2

석유화학 장치산업에서 염소저장탱크의 누출에 따른 유해 위험거리 및 누출시간과 흡입용량예측을 위한 분산 모델링

박종규(Jong-Kyu Park),이징연(Jing-Yeon Lee),이태호(Tae-Ho Lee) 한국환경관리학회 2011 環境管理學會誌 Vol.17 No.2

After calculate the density per hour of average maximum surface of the earth from the distance below-wind of chlorine gas, we did modeling experiment harmful danger distance(LOC) from the distance below-wind of chlorine gas about the density; TLV-TWA(Threshold Limit Values-Time Weighted Average), IDLH(Immediately Dangerous to Life or Health)-American legal restriction density used for evaluation of harmful possibility of danger, total release time(Strength), the release quantity per minute and an inhalation dosage(Dose) on depending change of the wind speed and the temperature. According to the result of modeling experiment, harmful danger distance was the following outcome, in case of the wind speed 2m/sec, it was 6.4Km;in case of the wind speed 10m/sec. it was 9Km, so the harmful danger distance responded to the change of the wind speed sensitively. And as a determinate cause of release time of harmful poisonous material is the temperature, in case of 20℃, the release time was 2’10”; in case and 35℃, it was 2’, so the release time increased when the circumference temperature was low. Moment inhalation dosage was, in case of wind speed 2m/sec, more than 1,000,000ppm and in case of 10m/sec, it was about 2,000ppm. Besides we give a result that in case of the circumference temperature 20℃, it was about 200,000ppm but in case of 3 5℃, it was 600,000ppm. So

오존산화를 이용한 동화성유기탄소의 측정법에 관한 연구

김지훈 ( Ji Hoon Kim ),정순형 ( Soon Hyung Chung ),이징연 ( Jing Yeon Lee ),이태호 ( Tae Ho Lee ),김인환 ( In Hwan Kim ) 한국수처리학회 2009 한국수처리학회지 Vol.17 No.3

폐정수슬러지를 이용한 점토블록 자원화 연구

황현욱(Hyeon-Uk Hwang),정순형(soon-hyung chung),이징연(Jing-Yeon Lee) 한국환경관리학회 2011 環境管理學會誌 Vol.17 No.2

In this research, sludge was added in the brick manufacturing to reduce the clay usage and examined the plasticity, compressive strength, surface absorption and the quality of the brick with step by step addition of sludge in the raw material, and compare the results with the brick quality standard rules and regulations whether the quality is satisfaction able or not. We examined possibility of recycling waterworks sludge by combining clay, kaolin, and silica as a block. The compressive strength was observed 361.1kgf/㎠ when brick was manufactured with 75% clay and sludge 5% and 20% silica which compete the 1st grade brick standard. The compressive strength was observed 349.9kgf/㎠ when 70% clay, 10% sludge and 20% silica, and 317.3kgf/㎠ was observed when 65% clay, 15% sludge and 20% silica was added, which satisfy the brick quality standard. Absorption of the brick manufactured by the addition 20% silica of 5%, 10% 15% sludge was observed 5%, 7.65%, and 8.92% respectively, satisfying the brick quality standard of grade. Conclusively, absorption and compressive strength with the addition of proper amount of sludge which satisfies the brick quality standard was observed 10 ~ 15%.

食品廢水의 燐除去를 爲한 實驗的 硏究 (Ⅰ)

李澄姸 대구보건대학 1988 대구보건대학 論文集 Vol.11 No.-

Removal of Phosphorus compounds from food waste water is an important operation, because these compounds play a critical role in lake eutrophication. Emphasis has been given to phosphorus removal for one reason : phosphorus is the mist critical nutrient. The purpose of this paper is made an experiment on the phosphorus removal of food waste water. The results are summarized as follows : 1. The phosphorus removal rate is above 90% in case of Fe^(+3)/PO₄^(-3)-P mole>1.7 and Al^(+3)/PO₄^(-3)-P mole>1.5 on the high phosphorus concentration in food waste water. 2. C.O.D removal rate shows above 90% in case of increasing Al^(+3) dosages. Influence of increasing Fe^(+3) dosages on the C.O.D removal rate is expressed opposite tendency to Al^(+3) dosages, C.O.D removal rate is on the decrease. 3. Suspended Solids in the treated effluent influences phosphorus removal rate and C.O.D removal rate, decreased each removal rate.

대구시 전통축제 놀이의 활성화를 통한 노인건강 증진방안

이징연 대구보건대학 2002 대구보건대학 論文集 Vol.22 No.-

The purpose of this paper was to develop the activity of traditional festival for the senior citizens' health in Daegu city. Recently, the positive factors for a local festival has not been revealed because of the cultural extinction, and administrational expedient. These phases distorted the succession of traditional festival and their life. Furthermore, These phases also caused that these senior citizens lost their traditional origin. Daegu city has been regarded one of culturally important city in South Korea. Therefore, this study attempted to practice a political task that people respect and care old people for their health, entertainment and life in Daegu city. Finally, developing their health through providing traditional festival could be able to establish a relationship between senior people and society.

기업 환경경영의 난제와 대응전략

이징연 대구보건대학 2003 대구보건대학 論文集 Vol.23 No.-

The purpose of this study is to explore and discuss some of the environmental management implications, problems and strategies in corporate operation as it adopts new paradigm to survive in changing society. The background and current situation are analysed and future recommendations made. The paper attempted to discuss factors contributing to the circumstances and endeavor to imply possible solutions. In conclusion, the widespread awareness of global environmental problems has put pressure on companies to better manage their environmental responsibilities. Therefore, the companies facing an environmental restraints and pressure of environmental organization needs to adopt environmental management as new paradigm such as environmental management system, environmental auditing and environmental performance evaluation. However, most of domestic companies tend to neglect an investment related to environmental management and have little understanding. The involved companies in environmental management are small and in short of high technology. To overcome these obstacles, some suggestions are as follows: First, companies should set up an effective environment strategy in order to meet the objective of environmental management. Second, it need to establish a detail and practical programs to meet the demands of reality. Third, it is necessary a change of recognition and creating value of environmental management, setting up effective strategy of environmental management and providing its information.

토양에 의한 영양염의 흡착 (其二) : 입도분포의 영향, 양이온의 영향 및 음이온의 영향

李澄姸 대구보건대학 1987 대구보건대학 論文集 Vol.10 No.-

The purpose of this paper is made an experiment of the adsorption rate of NH₄-N and PO₄-P in soil samples. The results obtained were as follows. 1. Influence of particle distribution on the adsorption rate of NH₄-N and PO₄-P is expressed opposite tendency between sand percentage and silt plus clay percentage. adsorption rate of NH₄-N and PO₄-P is not increase in proportion to clay percentage. 2. Adsorption rate of PO₄-P as compared with NH₄-N in soil samples shows a slightly higher rate. 3. Adsorption rate of NH₄-N is affected quite sensitively in order of K^(+)>Ca^(2+)≒Mg^(2+)>Na^(+). 4. Cl ion the adsorption rate of PO₄-P is not affected very much.