• 한국산학경영학회:학술대회논문집
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• 2005.11a
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• pp.29-46
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• 2005

Recently, TPS is one of the hot issues which enterprises and manufacturing related people were greatly concerned. TPS is very representative of Japanese production system. And TPS have contributed to the advance of industrial engineering. This study highlights the limitation and unsolved problems of presented TPS, through understanding the basic principles and characteristics and application process of TPS. To be continuously developing and competitive system in the future, we suggest New JIT System to complement current TPS system. New JIT is a customer oriented system. For the customer satisfied quality management, renovate business process in production, development and sales area. It has hardware and software system. Hardware system is consists of TMS, TDS, TPS. Software system Is scientific SQC utilized TQM. For the advanced next generation manufacturing management system, we should develop New JIT system.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.4
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• pp.421-428
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• 2008

Youngwon channel located in Chinhae city and formed by the Busan New Port Construction Project has been concerned about the water quality degradation problems because of the flow and pollutants stagnation due to its long-narrow shape. In this study, the water quality(hereafter WQ) variation is analysed by using the monthly WQ data measured in Yongwon channel from 2003 to 2007. The analysis shows that the TN and TP concentration in the inside Yongwon channel is definitely worse than the TN and TP concentration in the entrance of the Yongwon channel based on the 95% confidence level. The COD, TN, and TP concentrations in the Yongwon channel are 1.34, 2.08, and 1.80 times larger than that in the entrance of the Yongwon channel, respectively. It has been found that only the TP concentration in SW-26 station has an increasing trend based on the Mann-Kendall test with respect to 95% confidence level. The other stations and the other WQ constituent changes do not have the any significant trends.

• Journal of Korean Society on Water Environment
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• v.28 no.4
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• pp.505-511
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• 2012

While the existing sewage treatment facilities are mainly being operated by biological processes, winter-time efficiency improvement and additional phosphorus treatment equipment using chemicals have been required to follow the effluent criteria of TP (0.2, 0.3 and 0.5 mg/L for the zone of I, II and III respectively) and $BOD_5$ (5.0 mg/L) which is intensified from 2012 in Republic of Korea. We made an investigation into actual condition of biological treatment process and calculated the optimal chemical input amount by jar test of supernatant of secondary sedimentation tank to evaluate the process improvement for the intensified criteria. Ejector BAF system for removing TP, $BOD_5$ of sewage effluent was suggested. The concentration of TP from biological process is 0.3-0.8 mg/L, and the input amount of optimal chemical coagulant was above Al/P ratio of 3(1.9 mg/L as Al) to meet the criteria of TP for secondary treatment effluent. From the results of this experiment, the best Al/P ratio for Ejector BAF system was about Al/P ratio of 1, and LV of BAF process for intensified criteria of $BOD_5$ and TP was below 1.97m/hr.

• Journal of Korean Society on Water Environment
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• v.28 no.4
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• pp.551-560
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• 2012

The objectives of this study were to elucidate spatio-temporal heterogeneity of water chemistry and develop empirical models using trophic variables in Daechung Reservoir during 2005-2010 along with in situ tests of nutrient enrichment bioassays (NEB). The relations of water quality parameters in regard to precipitation showed that seasonal and interannual fluctuations of biological oxygen demand (BOD), total nitrogen (TN) and pH were minor, whereas conductivity, suspended solids (SS), and total phosphorus (TP) were largely varied in response to the magnitude of rainfall. The CHL maxima occurred immediately after the spate of TP during the high flow, indicating that phytoplankton growth was directly controlled by phosphorus. Empirical linear models of CHL-TP indicated that the variation of CHL in premonsoon was accounted 60% ($R^2$ = 0.60, p < 0.05, n = 54) by TP. In the mean time, empirical models of annual CHL-TN showed that the variation of CHL was weakly accounted ($R^2$ = 0.16, p < 0.001) by TN and more strongly ($R^2$ = 0.44, p < 0.001) by TP. Thus, the variation of CHL was more explained by the variation of TP than TN. In situ tests of Nutrient Enrichment Bioassays (NEBs) showed that the growth of CHL was greater in the P-treatments (as $PO_4-P$) than the control and N-treatment (as $NO_3-P$). Overall, our results suggest that phosphorus was aprimary limiting nutrient controlling the seasonal phytoplankton growth, based on the in situ experiments of NEBs.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.602-607
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• 2009

논에서 수질변화특성에 관한 메카니즘은 매우 복잡하다. 영양물질의 농도특성을 정확히 파악하기 위해서는 영농활동에 따른 체계적인 모니터링을 통한 다양한 측정 자료가 필요하다. 그러나 현재 논에서 토양의 산화환원에 관한 연구 자료는 많지 않기 때문에 그의 특성을 파악하기에는 어려운 실정에 있다. 본 연구의 목적은 충북대학교 부속농장 필지논에서 2008년 영농기간을 중심으로 논에서의 영양물질인 총인(TP), 인산성 인($PO_4-P$) 및 산화환원전위(Eh)의 변화특성을 파악함으로써, 논으로부터의 영양물질 유출제어에 관한 기초 자료를 제공하는데 있다. 이 연구는 2008년 6월부터 10월까지 필지논에서 논 표면수의 TP 와 $PO_4-P$의 농도변화와 토양의 산화환원전위(Eh)와의 관계 특성을 파악하였다. 관개기의 논에서 인은 분얼비 시기에 인성분이 시비되지 않았는데도 불구하고 분얼비 직후와 분얼비 1주일 후에 TP농도가 높게 나타났는데 이는 담수의 영향으로 논이 환원상태로 되어, 논바닥에 침전된 철이온에 흡착되어 있던 인이 철이온의 환원으로 함께 용출하기 때문이라고 생각된다. 산화환원전위(Eh)는 높아지면 산화경향을, 낮아지면 환원경향을 나타낸다. 본 연구기간 동안의 산화환원전위(Eh) 값은 비 관개기에 $201^{\sim}405$ mV로 높게 나타났고, 관개기에는 $93^{\sim}195$ mV로 낮게 나타났다. 필지논 표면수의 인농도는 분얼비 직후 1주일후까지 TP 와 $PO_4-P$ 농도는 같이 상승하다가 TP농도는 약 2주일까지 더 상승하여 2008년 최대값을 나타냈고 $PO_4-P$농도는 하강하였는데 이는 논 토양이 환원상태로 되면서 바닥에 있던 입자성 인이 논 표면으로 떠올랐기 때문으로 사료된다. 그 후에 담수가 끝나는 시점까지 농도는 낮아졌다. 강우량이 적은 관개초기에 인의 농도는 비교적 높게 나타났지만 강우량이 많은 여름에는 작물의 생장에 필요한 영양물질 섭취 등으로 인농도가 낮게 나타나 논은 인의 유출을 억제하고 있는 것으로 나타났다. 이와 같이 인의 유출특성 및 산화환원전위(Eh)의 변화에 따른 논에서의 유출부하 특성이 규명된다면, 환경부하가 적은 효과적인 물관리가 가능해 질 것으로 판단된다.

• Journal of Preventive Medicine and Public Health
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• v.28 no.2 s.50
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• pp.421-432
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• 1995

The influence of lead exposure on renal function was studied. Eighty nine lead exposed workers who worked in 2 storage battery factories, and seventy one control workers were chosen for this study. Blood lead(PbB) and zinc protoporphyrin in whole blood(ZPP) were selected as indicators of lead exposure. As indicators of renal function, urinary N-acetyl-$\beta$-D-glucosaminidase(NAG), blood urea nitrogen(BUN), serum creatinine(S-Cr), total protein in urine(U-TP),and serum uric acid(S-Ua) were selected. The results obtained were as follows: 1. While the mean values of lead exposure indicators of lead workers were significantly different from non-exposed ones, the mean values of NAG, U-TP, BUN and S-Cr of renal function indicators of exposed were also significantly different from non-exposed but their mean values were all within normal limits. 2. BUN, logarithmic U-TP, logarithmic NAG and S-Cr showed statistically significant correlation with PbB. 3. The proportion of workers whose values of renal function indicators were over the normal limits(NAG7.5 U/g Cr ; U-TP10.9 mg/dl ; BUN20 mg/dl ; S-Crl.2 mg/dl ; S-Ua7.0 mg/dl) by the level of lead absorption in terms of PbB and ZPP were calculated. The proportion of workers with over the normal limits of U-TP among total workers showed the dose-response relationship. When age is adjusted, U-TP showed significantly strong dose-response relationship with the level of PbB and ZPP.

• Journal of Sensor Science and Technology
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• v.29 no.5
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• pp.342-347
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• 2020

In this study, a portable total-phosphorus (TP) monitoring system utilizing a photocatalytic-reaction-based pretreatment method is proposed, fabricated, and characterized. Commercial TP monitoring systems are only used in laboratories because of their complex monitoring procedure, bulk-size, and high-cost. In particular, pretreatment in commercial TP monitoring systems is performed at high temperatures (> 120 ℃) and pressure (> 1.1 kg cm^-2) making it difficult to minimize the scale of the systems. The proposed TP monitoring system employs a pretreatment method with a photocatalytic reaction; thus, its size can be reduced, as photocatalytic reactions occur at room temperature and atmospheric pressure. Analytes with various TP concentrations are pretreated using the proposed portable TP monitoring system and are quantitatively measured with an LED and a photodiode.

• Microbiology and Biotechnology Letters
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• v.31 no.3
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• pp.264-270
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• 2003

A quantitative survey of the protozoa microfauna at bioreactor of advanced sewage treatment plant was carried out during a period of 11 months. In this study, 32 genera were identified, including 17 ciliates. The abundance of the important protozoa were compared with the operating parameters and water quality of the effluent of the plant using statistical procedure. Statistical analysis revealed a relationship between the abundance of some genera and removal rate. In particular, correlation analysis on the quality of effluent and protozoa indicated that Lepadella may be used as the bioindicator of TP removal and Trochilia, Entosiphon, Colepus may be used as the bioindicator of TN removal when water temperature was below $20^{\circ}C$.

• Korean Business Review
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• v.19 no.1
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• pp.93-114
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• 2006

Recently, TPS is one of the hot issues which enterprises and manufacturing related people were greatly concerned. TPS is very representative of Japanese production system. And TPS have contributed to the advance of industrial engineering. This study highlights the limitation and unsolved problems of presented TPS, through understanding the basic principles and characteristics and application process of TPS. To be continuously developing and competitive system in the future, we suggest New JIT System to complement current TPS system. New JIT is a customer oriented system. For the customer satisfied quality management, renovate business process in production, development and sales area. It has hardware and software system. Hardware system is consists of TMS, TDS, TPS. Software system is scientific SQC utilized TQM. For the advanced next generation manufacturing management system, we should develop New JIT system.

• Clean Technology
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• v.17 no.2
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• pp.103-109
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• 2011

The process optimization was carried out to improve the throwing power (TP) and the thickness uniformity of the electroless copper (Cu) plating, which plays a seed layer for the subsequent electroplating. The DOE (design of experiment) was employed to screen key factors out of all available operation parameters to influence the TP and thickness uniformity the most. It turned out that higher Cu ion concentration and lower plating temperature are advantageous to accomplish uniform via filling and they are accounted for based on the surface reactivity. To visualize what occurred experimentally and evaluate the phenomena qualitatively, the kinetic Monte Carlo (MC) simulation was introduced. The combination of neatly designed experiments by DOE and supporting theoretical simulation is believed to be inspiring in solving similar kinds of problems in the relevant field.