• Title, Summary, Keyword: team treatment

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A Study on the Effect of Pre-treatment on the Formation of Nitriding Layer by Post Plasma (포스트 플라즈마를 이용한 질화의 질화층 형성에 미치는 전처리의 영향에 대한 연구)

  • Moon, Kyoung Il;Byun, Sang Mo;Cho, Yong Ki;Kim, Sang Gweon;Kim, Sung Wan
    • Journal of the Korean Society for Heat Treatment
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    • v.18 no.1
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    • pp.24-28
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    • 2005
  • New post plasma nitriding can achieve a high uniformity that have been difficult in DC nitriding and have a high productivity comparable to gas nitriding. However, it has not a enough high nitriding potential for a rapid nitriding, because surface activation or ion etching in the general plasma nitriding cannot be expected. Thus, in this study, the effects of pre-treatments with oxidation and reduction gas have been investigated to improve the nitriding kinetics of post plasma nitriding. An effective pre-treatment consisting of oxidation and reduction resulted in the increase of surface energy of STD 11. This induced the surface hardness and the effective nitriding depth of STD 11. It is thought that the increase of the surface energy and the surface area with pre-treatment promote the nucleation of nitriding layer.

Analysis of Water Quality caused by Improvement of Sewage Treatment Plant in Masan Bay (하수처리장 개선이 마산만 수질에 미치는 영향분석)

  • Oh Hyun-Taik;Goo Jun-Ho;Park Sung-Eun;Choi Yun-Sun;Jung Rae-Hong;Choi Woo-Jeung;Lee Won-Chan;Park Jong-Soo
    • Journal of Environmental Science International
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    • v.14 no.8
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    • pp.777-783
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    • 2005
  • For the sustainable management of marine ecosystem in Masan Bay, we have to assess the carrying capacity and standard of target water quality. In this research, we assume that all pollutants loads are treated in Dukdong sewage treatment plant, then we simulate the physical-biological model for prediction water quality for the achievement of standard water quality. In 2001 year, for the achievement of COD 2.5 mg/L, we need to reduce COD $90\%$, nitrogen $30\%$, phosphate $90\%$ than that of the present value, According to these results, the water quality of sewage treatment plant is required to treat COD 13.5 mg/L, nitrogen 33.3 mg/L, phosphate 6,0 mg/L. If the sewage treatment plant will be expanded much larger in 2011, it will need to be treated in COD 6.6 mg/L, nitrogen 2.5 mg/L, phosphate 5 mg/L for the achievement of water quality standard in COD 2.5 mg/L.

Effects of High Levels of Nutrients on Growth Performance and Carcass Characteristics of Hanwoo Cattle

  • Reddy, Kondreddy Eswar;Jeong, Jin Young;Ji, Sang Yun;Baek, Youl-Chang;Lee, Seul;Kim, Minseok;Oh, Young Kyun;Lee, Hyun-Jeong
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.38 no.3
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    • pp.180-189
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    • 2018
  • The present study was conducted to evaluate the effects of high levels of nutrients on the growth performance, blood metabolites and carcass characteristics of Hanwoo cattle. Eighteen Hanwoo steers were fed two types of diets: 1) Nine animals were fed the conventional diet including typical levels of crude protein (CP) and total digestive nutrients (TDN), and 2) Nine animals were fed the treatment diet including high levels of CP and TDN. The average body weight (BW) and dry matter intake (DMI) were greater (P < 0.05) in the treatment group than in the conventional group at early and late fattening stages. Also, in the treatment group, the average daily gain (ADG) was greater (P < 0.05) at the late fattening stage. The serum total lipid and cholesterol levels were higher (P < 0.05) in the late fattening stage of treatment group. The carcass weight, total fat weight, longissimus muscle area and the grade of meat quality were also greater (P < 0.05) in the treatment group than the conventional diet group. This study demonstrates that high levels of CP and TDN exhibit a positive effect on the growth performance and carcass characteristics, indicating that high levels of CP and TDN can be used as a cost-effective feeding program for Hanwoo cattle by shortening the feeding period.

Marine Ecosystem Response to Nutrient Input Reduction in Jinhae Bay, South Korea

  • Oh, Hyun-Taik;Lee, Won-Chan;Koo, Jun-Ho;Park, Sung-Eun;Hong, Sok-Jin;Jung, Rae-Hong;Park, Jong-Soo
    • Journal of Environmental Science International
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    • v.15 no.9
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    • pp.819-827
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    • 2006
  • We study on the dynamic interaction with a simulated physical-biological coupled model response to nutrient reduction scenario in Jinhae Bay. According to the low relative errors, high regression coefficients of COD and DIN, and realistic distribution in comparison to the observation, our coupled model could be applicable for assessing the marine ecosystem response to nutrient input reduction in Jinhae Bay. Due to the new construction and expansion of sewage treatment plant from our government, we reduce 50% nutrient inputs near Masan Bay and sewage treatment plant. COD achieves Level II in Korea standard of the water quality from the middle of the Masan Bay to all around Jinhae Bay except the inner Masan Bay remaining at Level III. When our experiment reduces 50% nutrient inputs near Masan Bay and Dukdong sewage treatment plant simultaneously, COD decreases to about 0.1-1.2 mg/L $(128^{\circ}30'{\sim}128^{\circ}40'\;E,\;35^{\circ}05'{\sim}35^{\circ}11'\;N)$. The COD from the middle of the Masan Bay to Jinhae Bay achieves Level II.

Enhancing Lifetime of White OLED Device by Minimizing Operating Voltage Increase

  • Lee, Sung-Soo;Choi, Jun-Ho;Ha, Jae-Kook;Lee, Sang-Pil;Kim, Seong-Min;Choi, Ji-Hye;Lee, Soo-Yeon;Kim, Hyo-Seok;Chu, Chang-Woong;Shin, Sung-Tae;Kim, Chi-Woo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1658-1660
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    • 2007
  • We fabricate green device having unique life time characteristics of operating voltage reduction with time, ${\Delta}V_{op}$ <0. A green device needs lower voltage than initial voltage for sustaining constant current as life time goes on. It means there are two possible reasons; one is interface modification between anode and HIL due to oxygen plasma treatment and the other is bulk property modification due to combination of new green host and new green dopant. From these materials and oxygen plasma treatment, we can make white OLED device having the characteristics of low ${\Delta}V_{op}$ increasing.

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