• Asian-Australasian Journal of Animal Sciences
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• 제16권10호
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• pp.1438-1442
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• 2003

A method for the determination of nitrogen in ruminant feedstuffs, products and excreta (e.g. milk and urine) using a spectrophotometer is developed, where samples processed for P determination are also used to determine N. Samples are digested with sulphuric acid and subsequently with hydrogen peroxide in Kjeldahl tubes. Digested solutions along with phenol and buffered alkaline hypochlorite reagents are incubated in a water bath at $37^{\circ}C$ for 30 min and presented in the spectrophotometer. The spectrophotometer set at 625 nm measures the concentration of N of each sample. Nitrogen in 261 of the samples was also determined by the classical Kjeldahl method in order to develop a relationship between N determined by the Kjeldahl method (Y) and the colorimetric method (X). The mean value of Y was as high as that of X (0.92 vs. 0.96; p>0.05). The colorimetric method predicted Kjeldahl N highly significantly (Y=0.985X-0.024, $R^2=0.993$, p<0.001; or more simply Y=0.974X, $R^2=0.993$, p<0.001). An analysis of regression found no difference (p>0.05; both t-test and F-test) between colorimetric (0.96% N) and adjusted (0.96% N) N. In comparison with the Kjeldahl method, the analytical capacity of N by colorimetric method increases greatly, where 200-300 determinations of N are possible in a working day. In addition, the system provides an opportunity to use not only the same digested solution for both N and P determination of a particular sample, but also uses the same spectrophotometer to assay both N and P. Therefore, the system may be attractive in situations where both elements of a sample are to be determined. In conclusion, the speed of N determination, low cost, efficient use of labour, time and reagents, fewer items of equipment, and the reduction of environmental pollution by reducing effluent and toxic elements are the advantages of this method of N determination.

• 기술사
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• 제42권5호
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• pp.32-36
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• 2009

This project located in IFEZ(Incheon Free Economic Zone) is the first central heating and cooling type for high-rise residential building in korea. The design was performed as the joint venture between Cosentini from U.S.A and wooowon, and our design concept was to save energy. LEED application from USGBC is going on in progress for the first residential building in korea. Careful attention was paid from schematic design for not a durability of structural and architectural, but also durability and safety of M.E.P.

• 대한생식의학회:학술대회논문집
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• 대한불임학회 2004년도 제47차 추계학술대회
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• pp.59.1-59.1
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• 2004

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.53.1-53
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• 2002

$\textbullet$ Contents 1. Introduction $\textbullet$ Contents 2. Error Models of Navigation $\textbullet$ Contents 3. Observablity Properties of GPS/INS $\textbullet$ Contents 4. Measurement System for INS Error Estimation $\textbullet$ Contents 5. Numerical Simulation Results $\textbullet$ Contents 6. Conclusions

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.727-730
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• 1998

In this paper, we propose an implementation of an efficient parallel Radon transform on TMS320C80-based system. For an N$\times$N SAR image, we can obtain O(NM/p) of the conventional parallel Radon transform, by representing the projection patterns in Radon space variables instead of the image space variables, and pipelining the algorithm, where p is the number of processors and M is the number of projection angles. Also, we can reduce the time for the dynamic load distribution among the nodes and the communication overheads of accessing the global memories, by pipelining the memory and processing operations by using tripple buffer structure. Experimental results show an efficient parallel Radon transform of speedup Sp=3.9 and efficiency E=97.5% for 256$\times$256 image, when implemented on TMS320C80 composed of four parallel slave processors with three memory blocks.

• 대한화학회지
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• 제9권2호
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• pp.71-74
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• 1965

Reduction of Ti(Ⅳ)-oxalate complex on dropping mercury electrode has been studied as a function of oxalate concentration and of pH varied with HCl. Assuming there are equilibrium $TiO(C_2O_4)_2= \;+\;2H^+\;=\;Ti^{+4}\;+\;2C_2O_4\;=\;+\;H_2O,\;K_4$ in addition to $TiO(C_2O_4)_2\;^=\;=\;TiO^{++}\;+\;2C_2O_4=\;K_2\;Ti(C_2O_4)_2\;^-\;=\;Ti^{+3}\;+\;2C_2O_4=\;K_3$ in the system cathodic wave has been well explained for that pH is higher than 0.5. The equilibrium constants $K_2,\;K_3$ and $K_4$ have been to be $2{\times}10^{-12},\;5{\times}10^{-13}$ and $10^{-11}$, respectively. The reduction of Ti(Ⅳ)-oxalate system is $Ti^{+4}\;+\;e\;{\to}\;Ti^{+3}$ in the concentration of hydrochloric acid, higher than 3M.

• 한국잠사곤충학회지
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• 제39권1호
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• pp.36-43
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• 1997

In order to express the FLP recombinase in B. mori cultured cell line, BmN-4, transient expression system using a heat shock protein gene (hsp70) promoter of Dorosophilla melnogaster was constructed. This vector was designated as pHsSV. Activity strength of the hsp70 promoter was compared with that of immediate early gene (IE-1) and polyhedrin gene of BmNPV employing the E. coli $\beta$-galactosidase gene as a reporter gene. The result showed that the pHs $\beta$-gal plasmid vector expressed the $\beta$-galactosidase at 2nd and 3rd day after the transfer of plasmid DNA into BmN-4 cells, which was similar to that of pIE1 $\beta$-gal vector, but different from that of a recombinant virus, vBm $\beta$-gal. For the construction of FLP recombinase transient expression vector, the FLP recombinase gene was cloned by polymerase chain reaction technique. To express the FLP recombinase, this gene was inserted into pHsSV plasmid vector, under the control of the hsp70 promotor, and tranfected in BmN-4 cells. The expressed FLP recombinase was estimated at 44kDa on a 12.5% SDS-PAGE.

• Journal of Animal Science and Technology
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• 제56권7호
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• pp.26.1-26.10
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• 2014

Background: Endocrine disruptors are exogenous substance, interfere with the endocrine system, and disrupt hormonal functions. However, the effect of endocrine disruptors in different species has not yet been elucidated. Therefore, we investigated the possible effects of $17{\beta}$-estradiol (E2), progesterone (P4), genistein (GEN) and 4-tert-octylphenol (OP), on capacitation and the acrosome reaction in bovine, mouse, and porcine spermatozoa. In this in vitro trial, spermatozoa were incubated with $0.001-100{\mu}M$ of each chemical either 15 or 30 min and then assessed capacitation status using chlortetracycline staining. Results: E2 significantly increased capacitation and the acrosome reaction after 30 min, while the acrosome reaction after 15 min incubation in mouse spermatozoa. Simultaneously, capacitation and the acrosome reaction were induced after 15 and 30 min incubation in porcine spermatozoa, respectively. Capacitation was increased in porcine spermatozoa after 15 min incubation at the lowest concentration, while the acrosome reaction was increased in mouse spermatozoa after 30 min (P < 0.05). E2 significantly increased the acrosome reaction in porcine spermatozoa, but only at the highest concentration examined (P < 0.05). P4 significantly increased the acrosome reaction in bovine and mouse spermatozoa treated for 15 min (P < 0.05). The same treatment significantly increased capacitation in porcine spermatozoa (P < 0.05). P4 significantly increased capacitation in mouse spermatozoa treated for 30 min (P < 0.05). GEN significantly increased the acrosome reaction in porcine spermatozoa treated for 15 and 30 min and in mouse spermatozoa treated for 30 min (P < 0.05). OP significantly increased the acrosome reaction in mouse spermatozoa after 15 min (P < 0.05). Besides, when spermatozoa were incubated for 30 min, capacitation and the acrosome reaction were higher than 15 min incubation in E2 or GEN. Furthermore, the responsiveness of bovine, mouse and porcine spermatozoa to each chemical differed. Conclusions: In conclusion, all chemicals studied effectively increased capacitation and the acrosome reaction in bovine, mouse, and porcine spermatozoa. Also we found that both E2 and P4 were more potent than environmental estrogens in altering sperm function. Porcine and mouse spermatozoa were more responsive than bovine spermatozoa.

• 생명과학회지
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• 제21권9호
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• pp.1323-1328
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• 2011

본 연구에서는 페놀 화합물들을 현장에서 검출하기 위해 간단하고 간편한 일회용 재조합 박테리아 바이오센서 시스템을 개발하였다. 플라즈미드 pLZCapR을 함유하는 E. coli 세포를 ${\beta}$-galactosidase 기질인 CPRG와 함께 96-well plate의 wells에 agarose로 고정하였다. 이 바이오센서는 현장에서 발색을 위한 별도의 기질을 추가하거나 불편한 기기 사용 또는 시료의 전 처리를 필요로 하지 않는다. 시료의 측정은 간단히 적은 부피(<100 ${\mu}l$)의 현장 시료를 바이오센서를 포함하는 wells에 넣고 발색을 관찰하여 측정하였다. 또한 6% DMF, 0.1% SDS 그리고 10 mM $CaCl_2$를 첨가하여 agarose 고정에 의한 화합물의 세포내 확산 제한을 감소시켜 보다 더 나은 발색을 얻을 수 있었다. 따라서 이 고정된 미생물 유래 재조합 바이오센서 시스템은 현장에서 환경오염물질들을 간단하게 확인하고 정량 하는 유용한 접근 방법이 될 것으로 사료된다.

• 동력기계공학회지
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• 제9권2호
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• pp.93-98
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• 2005

The performance of cooling tower is dependent on the thermal performance of the packings. It's assessed by heat transfer rate and fan power. In this study, new packing was developed for application in compact type cross-flow cooling tower. The packing characteristic curve and the pressure drop curve were obtained by measuring packing characteristic values and pressure drops of small sized filler in comparison to existing mid-large sized filler. The heat transfer characteristics on small sized filler are about 66% higher than existing mid-large sized filler. The pressure drop characteristics on small sized filler are about two times of the pressure drop characteristics on existing mid-large sized filler.