• KOREAN POULTRY JOURNAL
• /
• v.24 no.2 s.268
• /
• pp.131-135
• /
• 1992

겨울철 산란육성계와 브로일러에서 장염, 미숙변, 연변, 계사과습 등으로 증체, 폐사, 도태율이 증가하여 생산성이 저하되며 산란성계 편입 후에도 능력을 최대한 발휘하지 못하여 고심한다. 여름철에는 콕시듐증이 문제이지만 겨울철은 방한시설에 치중하다보면 장염성 살모넬라증을 일으켜 눈에 보이지 않게 손실을 보게 된다. 닭에서 상기원인체인 살모넬라증은 인수공통전염병(人獸共通傳染病)의 하나로 닭은 물론 사람에게도 오염된 닭고기, 계란을 먹고서 때때로 식중독 증상을 일으킨다. 아울러 닭에서도 과습고온 사육시 연변, 하리, 장염, 소화장해 등으로 생산성 저해 소화기 질병을 일으킨다. 이 달에는 본 질병의 근본원인체인 살모넬라 장염에 대하여 기술한다.

• Korean Journal of Environmental Agriculture
• /
• v.30 no.1
• /
• pp.31-36
• /
• 2011

BACKGROUND: Disposal of slurry animal manure produced by an anaerobic slurry-type barn method is not easy since the animal slurry contain high moisture content which makes solid-liquid separation a difficult process. However, recently, the interest about anaerobic digestion process as an environment-friendly waste disposal method has gained a wide interest because it can treat highly organic matter contained by the piggery slurry, decrease the odor after treatment, and enable the effective recovery of the methane gas which is a valuable energy resource. The objectives of this study were to identify the solubilization characteristics and to improve the anaerobic digestion efficiency of piggery slurry through full-scale anaerobic digestion experiments. METHODS AND RESULTS: In a full-scale continuous anaerobic digestion operation, the adaptability of single anaerobic digestion and its digestion efficiency were also evaluated in the farm field. The actual pH range and alkalinity concentration of piggery slurry used during the operation were comparatively higher than the concentrations of pH and alkalinity in the digestion tank which were stable at 7.5~8.0, 4,008 mg/L (as$CaCO_3$), respectively. The removal efficiency of organic matter (TCOD) by anaerobic digestion was 75~90% and methane gas production amount was at 0.33 L/L/day, a little higher than that of ordinary animal manure. CONCLUSION(s): Our findings showed higher recovery of highly purified methane and greater efficiency of anaerobic tank digestion since its methane gas content was at 65~70%.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
• /
• v.10 no.1
• /
• pp.47-55
• /
• 2005

Seasonal variations of remineralization and inorganic nitrogen removal capacity were measured from Dec. 2001 to Apr. 2004 in a tidal flat located in south-western pan of Gwanghwa island, Korea by measuring the sediment oxygen demand (SOD) and denitrification. SOD was higher in muddy sediment (Dong-Mak; three year average=$683;m^{-2}d^{-1}$) than sandy sediment(Yeocha; three year average=$457;m^{-2}d^{-1}$). The SOD was high in summer and tended to be lower in winter. During the sediment incubation in Apr. 2002, production of oxygen from sediment was observed implying active benthic photosynthesis. Denitrification was also higher in muddy sediment (Dong-Mak: $5.4;m^{-2}d^{-1}$) than sandy sediment (Yeocha; $3.4;m^{-2}d^{-1}$). The denitrification rate corresponds to the carbon remineralization rate of 9.3 and $5.9\;mg-C\;m^{-2}d^{-1}$ in Dong-Mak and Yeocha, respectively. The denitrification rates were lower compared to rates observed in other coastal area $(0{\sim}200\;{\mu}mole\;m^{-2}h^{-1})$. Although Kwanghwa tidal flat sediments are replete in organic matter, remineralization activity seems to be limited by the availability of labile organic matter. The Kwangwha tidal flat may have potential to effectively remove large load of organic matter. Net remineralization rates were 196 and $132\;mg-C\;m^{-2}d^{-1}$ in Dong-Mak and Yeocha, respectively.

• Venture DIGEST
• /
• s.24
• /
• pp.4-5
• /
• 2003

월드컵 4강의 꿈(★)을 이뤄냈던 대한민국 축구. 그 중심에는 자랑스런 24인의 태극전사가 있었다. 그리고 한마음으로 목이 터져라 응원전을 펼친 4000만 국민이 있었다. 하지만 우리의 기억 속에 우뚝 자리한 사람은 누가 뭐라고 해도 거스 히딩크 감독일 것이다.그는 선수 개개인의 능력을 철저히 분석하고 조련하여 여러 포지션을 소화낼 수 있는 멀티플레이어를 만들어냄으로써 월드컵 4강의 신화를 창조해 낼 수 있었다. 하지만 멀티플레이어는 푸른 그라운드뿐 아니라 벤처업계도 존재한다. 1994년 국내 최초로 컴퓨터와 전화를 통합시킨 CTI(Computer Telephony Integration)를 도입하여 국내 정보통신 부가서비스 분야에서 폭발적인 성장을 이끌면서 부동의 업계 1위를 고수하고 있는 콜센터 전문기업 로커스의 김형순 대표, 그가 바로 멀티플레이형 벤처기업인이다. 무역업을 시작으로 사업에 뛰어든 김 대표는 팩스 뉴스 자동검색 서비스, 통신솔루션 그리고 엔트테인먼트에 이르기까지 그야말로 다재다능한 능력을 보여준 멀티플레이어 벤처인이다.

• Korean Journal of Construction Engineering and Management
• /
• v.14 no.5
• /
• pp.26-34
• /
• 2013

Recently, many companies recognize the individual human resource as a core asset of the corporate value creation and devote a lot of effort to develop and manage competency-based human resource in order to strengthen the corporate competitiveness. As the integrated construction company taking the major portion in Korean construction industry, its construction engineers perform the construction supervision task with various related parties at each stage of the life cycle of the construction project. Therefore, the competency of a construction engineer is an important factor which have a direct impact on the success of the construction project. However, the current capability evaluation scheme of the domestic construction engineers is mainly oriented on the qualification factors such as the certificates or the seniority and this is quite different from evaluating the actual ability for construction management tasks. In this point of view, this study proposes the appropriate level of proficiency in cost management by analyzing the work process and its detailed items of the cost management that is the one of the basic management items of the construction industry. Based on this, this study analyzes the current competency level of the construction engineer by comparing with the required competency of each job position and also performs the engineer's work competency analysis of each work step.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.8 no.1
• /
• pp.156-166
• /
• 2007

Soybean meal was widely used as a protein source in pig feedstuff because it has a good amino acid balance compared with other vegetable sources. However, soybeans contain trypsin inhibitors and other antinutritional factors which can lead to lower the digestibility of amino acid, and consequently reduce the growth performance. Heat treatment of soybeans is helpful shown to decrease the antinutritional factors and elicit an improved growth performance. Additionally, microbial processe using(HP 100, HP 200 and HP 300), and non-protein constituent removal are suggested to improve the growth performance and nutrient digestibility. Inadequate heat treatment of soybeans gives no damage to adult pig, but it has been shown to decrease nutrient digestibility in young pig. So, soy protein concentrate (SPC) and Isolated soy protein(ISP) were more widely used for nursery pigs than growing and finishing pigs, since SPC and ISP have similar characteristics as milk product.

• Korean Journal of Poultry Science
• /
• v.31 no.2
• /
• pp.85-91
• /
• 2004

This study was conducted to investigate the effects of dietary direct-fed microbials(DFM) on the growth performance and nutrient digestibility in broiler chickens. A total of two hundred eighty eight broiler chickens were randomly allocated into six treaments with four replications and fed for five weeks. Dietary treatments included 1) CON (basal diet), 2) DFM-1(basal diet + 0.2% Enterococcus sp. ＆ Lactobacillus reuteri), 3) DFM-2(basal diet + 0.2% Enterococcus sp. ＆ Lactobacillus plantarum), 4) DFM-3(basal diet + 0.2% Enterococcus sp. ＆ Lactobacillus reuteri ＆ Lactobacillus plantarum), 5) DFM-4(basal diet + 0.2% Enterococcus sp. ＆ Lactobacillus reuteri ＆ Lactobacillus plantarum ＆ Yeast), 6) DFM-5(basal diet + 0.2% Enterococcus sp. ＆ Lactobacillus reuteri ＆ Lactobacillus plantarum ＆ Bacillus subtilis). During the period of 1∼3weeks, average daily gain (ADG) and Feed/Gain were not significant different among treatments. In the later(3∼5weeks) and overall period(l∼ 5weeks), ADG and Feed/Gain tended to be improved in DFM treatments compared to the control. However, there were no significant differences among DFM complexes and between control and DFM treatments. The broilers fed DFM-3 diet was showd poor growth performance compared to the broilers fed DFM-l diet and similar to the broilers fed DFM-2 diet but there was no significant differences. The treatments of DFM-4 diet added Yeast and DFM-5 added Bacillus subtilis were improved in ADG and Feed/gain but no significant differences were found and also there was no specific DFM treatments in experiment period. In digestibility, the broiler chicks fed DFM treatments tended to improve N digestibility compared to control treatment. However, they were not significantly different among the treatments. In conclusion, DFM tended to improve growth performance in later stage of broiler.

• Proceedings of the Korea Information Assurance Society Conference
• /
• 2004.05a
• /
• pp.167-172
• /
• 2004

In the process of presenting the additional criteria, ISST, developed to evaluate teachers' capacity of applying information, suggests the criteria without considering teacher's own task. Information Ethics and Security Model is made up of two parts. In one part, it deals with four areas concerning with Information Ethics evaluation to measure the sensibility of Information Ethics of Information Teacher In another part, it is divided Information Security Evaluation into three areas which estimate technical method to secure the information system tying in the environment of information-oriented education.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.6
• /
• pp.588-597
• /
• 2016

In this study, we attempted to improve the biogas production efficiency by varying the mixing ratio of the mixed sludge of organic wastes in the improved single-phase anaerobic digestion process. The types of organic waste used in this study were raw sewage sludge, food wastewater leachate and livestock excretions. The biomethane potential was determined through the BMP test. The results showed that the biomethane potential of the livestock excretions was the highest at $1.55m^3CN4/kgVS$, and that the highest value of the composite sample, containing primary sludge, food waste leachate and livestock excretions at proportions of 50%, 30% and 20% respectively) was $0.43m^3CN4/kgVS$. On the other hand, the optimal mixture ratio of composite sludge in the demonstration plant was 68.5 (raw sludge) : 18.0 (food waste leachate) : 13.5 (livestock excretions), which was a somewhat different result from that obtained in the BMP test. This difference was attributed to the changes in the composite sludge properties and digester operating conditions, such as the retention time. The amount of biogas produced in the single-phase anaerobic digestion process was $2,514m^3/d$ with a methane content of 62.8%. Considering the value of $2,319m^3/d$ of biogas produced as its design capacity, it was considered that this process demonstrated the maximum capacity. Also, through this study, it was shown that, in the case of the anaerobic digestion process, the two-phase digestion process is better in terms of its stable tank operation and high efficiency, whereas the existing single-phase digestion process allows for the improvement of the digestion efficiency and performance.

• Journal of Korean Society of Environmental Engineers
• /
• v.28 no.2
• /
• pp.173-177
• /
• 2006

Pesticides from diffuse pollution sources adsorbed in suspended particles flow into surface water and threats to the public health. In this research, dechlorination constants of Atrazine by zero valent iron were measured with addition of buffer solution for simulating buffer capacity of sediment. When initial concentration of Atrazine was 10, 30, and 50 mg/L, their dechlorination was explained using the pseudo-first order reaction. Dechlorination constants $K_{obs}$ were $3.21{\times}10^{-2}/d$ in average.