• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.17-18
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• 2023

This study aims to compare the hardness value development characteristics according to the water-cement ratio during a series of experiments to develop a setting estimator for an AI-based concrete finishing automation system. For the test variables, water-cement ratios are varied with 30, 40 and 50%. Proctor penetration test and surface hardness test by setting time estimator are conducted to estimate the setting time. For the effect of water-cement ratios, they did not affect the surface hardness either, while initial set time and final set time are not constant with water-cement ratios.

• 한국축산시설환경학회지
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• 제18권3호
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• pp.165-172
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• 2012

비육돈사의 돈방 바닥면적과 형태가 체중 80 kg 이상 버크셔종 비육돈의 생산효율과 행동특성 및 도체품질에 미치는 영향을 조사하기 위하여 총 336두를 공시하여 시험을 수행하였다. 비육돈사 돈방바닥 형태는 콘크리트 슬랏 바닥과 톱밥바닥으로 하여 비교하였으며, 두당 바닥면적은 $1.0m^2$와 $2.5m^2$를 비교하였는데, 사료섭취량, 증체량 및 사료요구율 등 생산효율과 눕고, 걷고 먹는 등의 동작으로 보낸 시간의 비율 등 행동특성 및 부분육 생산량 비교, 등심근 pH, 보수성, 육즙손실, 전단력과 같은 도체품질 특성을 조사, 비교하였으며 그 결과를 요약하면 다음과 같다. 비육돈의 두당 바닥면적과 바닥형태 차이는 사료섭취량과 증체량 및 사료요구율 등 생산효율에 영향을 미치지 않는 것으로 나타나 두당 바닥 면적을 증가시키거나 돈방바닥을 톱밥으로 처리하여도 생산효율 차이는 인정되지 않았다. 두당 바닥면적과 바닥형태 차이는 옆으로 누운 자세와 걷는 동작으로 보낸 시간 비율에 영향을 미치지만, 앉고 걷고 먹고 마시는 행동에는 영향을 미치지 않았다. 두당 바닥면적과 바닥형태 차이는 돈육 등심근의 수분함량, pH, 보수성, 육즙손실 및 전단력에 영향을 미치지 않는 것으로 나타났으며, $1.0m^2$와 $2.5m^2$의 두당 바닥면적 및 콘크리트 슬랏 바닥과 톱밥바닥 간에 등심근의 육질특성 차이는 인정되지 않았다.

• 농촌계획
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• 제11권3호
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• pp.53-57
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• 2005

Up to recently building are constructed focusing on the convenience of residential condition. However, environmental-friendly materials is required for construction as people are spending more time inside buildings and causes of many problems like sick-building syndrome are known due to the noxious gases and polluted air originated from construction materials. Although loess(hwangtoh) is an environmental-friendly material, it has limitations in compressive strength far a construction material. The purpose of this study is to suggest the optimal ratio of loess(hwangtoh) mortar by tests of compressive strength comparing with standard strength of floor finishing mortar and evaluate the usability of loess(hwangtoh) mortar for floor finishing material through an impact test, a cracking test and a abrasion test. Based on the results of this study, 86% of loess(hwangtoh) and 14% of inorganic binder is suggested for the optimal mixture ratio of loess(hwangtoh) mortar. Moreover, the characteristics of loess(hwangtoh) is suitable for floor finishing material in impact, crack, abrasion.

• 한국의류산업학회지
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• 제23권6호
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• pp.836-843
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• 2021

Recently, with an increase of interest in hygiene of textile products, research related to finishing technology to impart various functionalities, such as antibacterial and deodorizing properties, has also required. Therefore, in this study, the improvement of comfort was examined by analyzing the change of moisture characteristics and antibacterial and deodorizing properties of underwear fabric by chitosan microcapsule(CH-M) finishing. The results revealed that moisture absorption time of the fabric shortened, diffusion rate increased, while absorption rate slightly increased because of microcapsule finishing. In addition, the one-way transfer capacity of the microcapsule finished fabric was 17.69, which improved moisture transfer to one side, while OMMC showed the values of 0.32 and 0.37 for untreated and finished fabrics, respectively, which slightly increased after finishing. In the case of untreated fabric, antibacterial activity was 89.0% against Staphylococcus aureus and 70.3% against Klebsiella pneumoniae; however, both strains showed 99.9% antibacterial activity by CH-M finishing. An excellent bacterial reduction rate was also observed. In the case of the CH-M finished fabric, there was a deodorization effect exceeding 99% up to 120 minutes, and it showed an excellent deodorization effect of more than 99% even after 10 repeated washings.

• 한국임상수의학회지
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• 제15권2호
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• pp.427-431
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• 1998

This study was undertaken to investigate the effect of exercise induced pulmonary hemorrhage(EIPH) on the finishing position of racehorses, 400 bleeders(305: 1 time, 76: 2 times, 19: 3 times, total: 514 cases) which had bled(EIPH) from their nostrils after their races at the Seoul racecourse during the 5 years period('93-'97) were analyzed for this study. The ratio of bleeders to total racehorses in finishing position 1-3,4-6, 7-9 or above 10 was 0.55, 0.84, 0.90 or 1.13%, respectively. There is tendency to higher incidence of bleeding in the later positioned racehorses group. To analyze the correlation between EIPH and finishing position, finishing potion of each EIPHed horses' was checked at 7 successive races(3 races each before/after EIPH. The average final position at the -3rd race, -2nd racer -lst racer EIPHed race, 1st race,2nd race and 3rd race of each bleeder was 5.85. 5.94, 6.21, 7.32, 7.20, 6.51 and 6.53, respectively. Raring times were adjusted to 1,000 m equivalent. Average racing times of the -3rd race,-2nd racer -lst raced EIPHed race, 1st race, 2nd race and 3rd race of each bleeder was 67.1, 67.1, 67.2, 67.6, 67.5, 67.4 and 67.3 second, respectively. Bleeders which finished the race within 1 second following the winners were 25. 3% of total bleeders. The rest 74.7% reached at the finish line 1 second later than the winners. Particularly 46.3% of bleeders were above 2 second later. Therefore this study suggested that bleeding has effect on performance of the racehorse, consequently it make bleeders be placed later positions.

• 한국구조물진단유지관리공학회 논문집
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• 제28권1호
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• pp.32-38
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• 2024

공동주택의 경우 사람의 실거주 및 코어시험 시 일어나는 분진 및 소음 등으로 인하여 비파괴검사를 진행하기 어려워 공용부 및 지하 주차장에서 매번 점검이 이루어지며, 저가 수주로 인한 콘크리트 면의 실험이 아닌 마감재 위에서 실험을 진행하여 부실점검이 발생할 수 밖에 없는 실정이다. 또한 강도 추정을 위한 제안식들은 시험조건과 환경의 차이에 따라 변동폭이 크고, 동일한 측정값을 나타내더라도 제안식 마다 그 편차가 커 정확한 강도 추정이 어려워 사용에 어려움을 겪고 있는 실정이다. 이에 공동주택에 주로 사용되는 마감재를 선정하여 마감재를 제거하지 않고 직접 마감재에 비파괴검사법을 활용하여 마감재 종류에 따른 콘크리트 압축강도 비교 평가를 하고자 한다. 마감재 종류에 따른 초음파속도법을 이용한 콘크리트 추정압축강도 신뢰도 평과 결과는 다음과 같다. 초음파속도법을 통해 도출된 추정압축강도와 압축강도의 오차율은 21.83% ~58.89%로 광범위한 변동폭을 보이며. 추정압축강도에 대한 마감재 유무의 영향은 미비한 것으로 나타났다. 이에 마감재 종류를 더 선정하여 마감재 유무에 따른 초음파속도법 연구가 필요하며 신뢰도를 높일 수 있는 추정기법 연구가 필요하다.

• Asian-Australasian Journal of Animal Sciences
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• 제28권7호
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• pp.999-1005
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• 2015

Bacillus-based feed additive was evaluated for its efficacy on growth performance, nutrient digestibility, fecal gas emission, and the consumption of time and amount of water for cleaning the pen of growing finishing pigs. A total of 120 growing pigs ($23.59{\pm}1.41kg$) were used in a 16-wk feeding trial. Pigs were randomly distributed into 1 of 2 treatments on the basis of body weight and sex. There were 12 replicate pens per treatment, with 5 pigs (3 barrows and 2 gilts) per pen. Dietary treatments were CON which was basal diet, and T1 which was CON+62.5 ppm microbial feed additive that provided $1.47{\times}10^8cfu$ of Bacillus organisms per gram of supplement. During the weeks 0 to 6, average daily gain (ADG) in T1 treatment was higher (p<0.05) than CON, but no improvement in average daily feed intake (ADFI) and feed efficiency (G:F) was noted. During 6 to 16 weeks, no difference (p>0.05) was noted in growth performance. However, ADG was improved (p<0.05) and overall ADFI tended (p = 0.06) to improve in T1 compared with CON. At week 6, the co-efficient of apparent total tract digestibility (CATTD) of dry matter (DM) nitrogen (N) was increased (p<0.05) in T1 compared with CON. Fecal $NH_3$ emission was decreased (p<0.05) in T1 compared with CON, at the end of 6th and 15th weeks. The time and water consumed for washing the pens were decreased (p<0.05) in T1 compared with CON. In conclusion, supplementation with Bacillus-based feed additive could improve the overall growth performances, increase the CATTD of DM and decrease the fecal $NH_3$ content and the time and water consumed in washing the pens for growing-finishing pigs.

• 대한가정학회지
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• 제42권8호
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• pp.113-121
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• 2004

This study used cupric sulfate as a bum-out agent. The concentration of cupric sulfate, temperature and time were varied with glycerin included or excluded on the properties of polyester ground fabrics. The results are as follows. The effect of carbonization with glycerin included was decreased, but removal of carbide with glycerin included was easier than that with glycerin excluded. The white index and tensile strength of polyester ground fabrics were decreased as the processing concentration, temperature and time increased. The shrinkage was increased as the processing concentration, temperature and time increased. The optimum conditions with cupric sulfate as the bum-out agent was 5％ concentration, 140$^{\circ}C$, 3min., and 3kgf/cm$^2$ and with cupric sulfate added to glycerin was 5％ concentration, 150$^{\circ}C$, 5min., and 3kgf/cm$^2$.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.116.3-116
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• 2001

A diagnosis methodology for thickness quality in hot finishing mill is proposed based on multivariate statistical analysis. The thickness of hot strip is a key quality factor that is measured by x-ray thickness gauge. Currently, the thickness quality is guaranteed by upper and lower limit of thickness deviation from target thickness. But if any over-limit is occurred, there is no in-line method to identify the causes. In this paper, many parameters are extracted from the thickness deviation signal such as mean deviation(top, middle, tail), rms deviation(top, middle, tail) and peak deviation(top, middle, tail) as time domain parameters ...

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1877-1880
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• 2003

We were interest in Deburring using MAF(magnetic abrasive finishing) method. So Magnetic inductor was designed and manufactured to generate proper magnetic induction fer deburring the burr formed in drilling SM45C. We experienced according to the Rotational speed, table feed rate, grain size of powder and working gap are changed to investigate the effect on deburring. At this time we experienced in abrasive effect mainly.