• 한국진공학회:학술대회논문집
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• 한국진공학회 1994년도 제6회 학술발표회 논문개요집
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• pp.36-36
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• 1994

• Communications for Statistical Applications and Methods
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• 제7권1호
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• pp.285-290
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• 2000

We noted a property of a stationary distribution on the matrix C, which is the covariance matrix of order statistics of standard normal distribution That is the sup norm of th powers of C is ee' divided by its dimension. The matrix C can be taken as a transition probability matrix in an acyclic Markov chain.

• 한국진공학회:학술대회논문집
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• 한국진공학회 1992년도 제3회 학술발표회 논문개요집
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• pp.93-93
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• 1992

• 설비공학논문집
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• 제7권2호
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• pp.341-352
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• 1995

In this study, thermal parameters were measured and 213 occupants were also questioned in three office buildings located in Seoul during the summer season. Predicted mean vote-predicted percentage of dissatisfied(PMV-PPD) and standard new effective temperature(SET*) were used for evaluating Korean thermal sensation. The distribution of thermal sensation vote(TSV) and percentage of dissatisfied(PD) is very similar to that of PMV and PPD. By regression analysis, the following regression equation was obtained; TSV=0.339SET*-8.583. In this case, neutral temperature and comfort range are $25.3^{\circ}C$, $23.8{\sim}26.8^{\circ}C$ respectively. Present experimental results obtained from the field study is less sensitive to the temperature change than those obtained from the climate chamber study in Korea. But, thermal sensations are similar to each other near the neutral point. The neutral temperature and comfort range obtained by this experiment are higher than those of ANSI/ASHRAE Standard 55-1974 about $1.4{\sim}1.8^{\circ}C$.

• 교육녹색환경연구
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• 제4권4호
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• pp.1-18
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• 2004

Research has been carried out to study thermal environment in a classroom under three kinds of air diffusion temperature and six kinds of air diffusion direction for ceiling type air conditioner. The velocity and temperature distributions of air in the room calculated by 3-dimensional numerical method(PHOENICS), This present study was also conducted to calculate the Air Diffusion Performance Index(ADPI) for cooling conditions and Predicted Percentage of Dissatisfied(PPD) for heating conditions. This analysis shows that the optimum angle of ceiling type air conditioner's diffusion is $15{\sim}30^{\circ}$ for cooling mode and about $15{\sim}45^{\circ}$ for heating mode in these calculating conditions. And also analysis has been carried out to evaluate thermal comfort of vertical and horizontal cross section of classroom.

• 대한조선학회논문집
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• 제42권4호
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• pp.402-410
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• 2005

This paper focused on the analysis of the thermal comfort conditions in 1,000 ton class patrol ship's cabins through the evaluation of PMV(predicted mean vote) and PPD(predicted percentage of dissatisfied). Different areas have different clothing and activity in the ship. Therefore, any area may be thermally uncomfortable in case of air conditioning with equal temperature, relative humidity and relative air velocity. PMV or PPD-DCAC (demand controlled air conditioning) system is a new design that the whole cabins are maintainable with the ideal thermal comfort condition.

• 대한수의학회지
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• 제48권2호
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• pp.181-185
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• 2008

Comparative studies of histopathologic lesions from 23 purified protein derivative (PPD) positive cattle, 21 slaughter cattle found with tuberculosis, and 11 tuberculosis-positive elk (Cervus elaphus) were performed. PPD positive cattle did not show specific histopathologic lesions in all 23 heads that were no visible lesion reactor. Slaughter cattle found with tuberculosis revealed microscopically classical granulomatous lesion (tubercle) with central caseous necrosis surrounded by mantle of epithelioid cells and Langhan's giant cells capsuled by connective tissue in lung. Elk was noted with some different lesion patterns with classical granulomatous lesion and suppurative abscesses that was composed of fibrin, degenerated cells without having connective tissue. In addition, many Langhan's giant cells infiltration in alveoli at peripheral lesion were observed in some cases of classical granulomatous lesion and suppurative abscesses.

• 한국응용과학기술학회지
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• 제27권2호
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• pp.129-136
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• 2010

A series of noble poly(amide-imide)s and copoly(amide-imide)s bearing 1,2-bis(4-phenoxy)benzene units were synthesized by the direct polycondensation of 1,2-bis(4-trimellitimidophenoxy)benzene[1,2-PTPB] with a combination of commercially available aromatic diamines and diacids such as m-phenylene diamine, p-phenylene diamine(PPD), isophthalic acid and terephthalic acid(TA) in N-methyl-2-pyrrolidone(NMP) using triphenyl phosphite and pyridine as a condensing agent in the presence of dehydrating agent ($CaCl_2$). The resulting polymers had inherent viscosities in the range of 0.37~0.78 dL/g and most of them were soluble m common organic solvents including NMP, dimethylacetamide, dimethylsulfoxide, dimethylformamide, and m-cresol. Wide-angle X-ray diffractograms revealed that the copoly(amide-imide) derived from PPD with mixed acids of 1,2-BTPB and TA, showed crystalline nature, whereas all of the other polymers were found to be amorphous. The glass transition temperatures of the polymers occurred over the temperature range of $270{\sim}323^{\circ}C$ in their differential scanning calorimetry curves and their 10% weight loss temperature, determined by thermogravimetric analysis in air and nitrogen atmosphere, were in the range $465{\sim}535^{\circ}C$, $500{\sim}550^{\circ}C$, respectively, indicating their good thermal stability.

• 한국기후변화학회지
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• 제7권3호
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• pp.357-371
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• 2016

Buildings in the city acts as a cause of distorted wind direction, wind speed, causing the stagnation of the air flow. In the recent trend of climate change can not but consider the temperature rise of the urbanization. This study was aimed to analyze the thermal comfort of planetary boundary layer in different artificial constructions areas which has a direct impact on urban climate, and estimating the warming phenomena. Envi-met model was used to consider the urban structure associated with urban growth in order to precisely determine the impact of the building on the city weather condition. The analyzed values of thermal comfort index were temperature, wind speed, horizontal and vertical turbulent diffusivity. In particular, analysis of the PPD(Predicted Percentage of Dissatisfied) represents the human thermal comfort. In this study, by adjusting the arrangement and proportion of the top floor building in the urban it was found that the inflow of the fresh air and cooling can be derived low PPD. Vertical heat flux amount of the city caused by climate change was a factor to form a high potential temperature in the city and the accumulation of cold air does not appear near the surface. Based on this, to make the city effectively respond to climate change may require a long-term restructuring of urban spatial structure and density management.

• Tuberculosis and Respiratory Diseases
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• 제53권1호
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• pp.5-16
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• 2002

연구배경 : 말초혈액 단핵구와 폐포 대식세포가 림프구에 의하여 활성화된 후 탐식된 세포내 결핵균을 제거하는 최종 효과기로 작용하지만 결핵균은 이러한 세포 내에서조차 살아남아 증식한다. 본 연구에서는 인체 감염의 경우와 유사하도록 낮은 감염률(결핵균:포식세포 1:10)을 이용하여 MAC(Mycobacterium avium)과 Mycobaterium tuberculosis $H_{37}Ra$에 대한 단핵구와 폐포 대식세포의 림프구 의존적 결핵균 살해능의 정도를 측정하고자 하였다. 방 법 : 정상인과 폐결핵 환자의 말초혈액 단핵구를 Ficoll gradient 방법을 이용하여 분리하고, 정상인의 폐포 대식세포를 기판지폐포 세척액에서 분리 하여 96well plate에 $1{\times}10^5$ 씩 분주하고 결핵균주 MAC과 $H_{37}Ra$에 낮은 감염률(결핵균:단핵구 1:10)로 감염시켰다. 일부는 비부착세포(림프구)를 림프구:포식세포 10:1 비율로 첨가하여 $37^{\circ}C$, 5% $CO_2$ 배양기에 배양하였다. 1일, 4일, 및 7일째 각각 수확하여 middlebrook 7H10/OADC agar plate에 접종 후 집락이 형성될 때까지 $37^{\circ}C$, 5% $CO_2$ 배양기에 배양하였다. 결핵균의 수는 lysate의 $m{\ell}$(세포수 $10^6$)당 CFU로 표시하였고, 결핵균의 살해능은 log killing ratio[logKR=$log_{10}$(Final CFU/Initial CFU)]로 표시하였다. 배양 1일째 상층액에서 TNF-${\alpha}$, 배양 4일째 상층액에서 ${\gamma}$-IFN을 Elisa kit를 사용하여 측정하였다. 결 과 : 단핵구의 세포내 결핵균 살해능은 정상대조군에 비하여 결핵환자군에서 ${\Delta}logKR$가 MAC -0.4, $H_{37}Ra$ -0.2 정도로 유의하게 증가되어 있었다(p<0.05). 정상대조군에서 폐포 대식세포의 결핵균 살해능은 단핵구에 비하여 ${\Delta}$logKR가 MAC과 $H_{37}Ra$ 모두 -0.2정도로 증가된 경향을 보였다. 단핵구와 폐포 대식세포내 결핵균 살해능은 림프구 의존적으로 림프구 첨가시의 ${\Delta}logKR$는 MAC -0.4, $H_{37}Ra$ -0.5 정도로 포식세포 단독에 비하여 유의하게 증가되었다 (p<0.05). ${\gamma}$-IFN은 말초 단핵구와 폐포 대식세포 단독배양시 분비량이 경미하였으나 림프구 첨가시에는 유의한 분비의 증가를 보였다. 결 론 : 본 연구는 낮은 결핵균 감염률을 이용한 인체 포식세포의 세포내 결핵균 감염 모델이다. 결핵균 살해능은 림프구 의존적이며, 포식세포의 결핵균 탐식 후 7일까지의 배양에서 결핵환자의 단핵구와 PPD 양성 정상인의 폐포 대식세포에 림프구를 첨가한 경우에만 실질적인 균 증식의 제한을 볼 수 있었다.