• 한국식품영양과학회지
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• 제12권1호
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• pp.41-45
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• 1983

본 연구는 식후(食後) 단시간내(短時間內)에 장내용물(腸內容物)이 존재(存在)하고 있는 장(腸)loop내(內)에 $^{45}Ca$을 직접 주입(注入)한 후, 장(腸)loop로부터의 $^{40}Ca$ 및 $^{45}Ca$의 소실량(消失量), 또는 문맥혈중(門脈血中) $^{45}Ca$의 출현량(出現量)에 의해 Ca흡수량을 측정 비교할 수 있는 in situ closed gut segment법(法)의 하나를 확립(確立)하고져 행하여 졌다. 성장기 흰쥐에게 casein식(食)을 급여하고 검토한 결과, in situ closed gut segment법(法)의 실험 최적조건(最適條件)은 ligation부위는 회장중앙부 15-20cm, 주입액(注入液)의 조성(組成)은 $0.2{\sim}0.5{\mu}Ci/5{\mu}gCa/0.5ml$, pH 7.0, $37^{\circ}C$, 장(腸)loop로부터 $^{40}Ca$ 및 $^{45}Ca$의 소실량(消失量) 측정(測定)은 $^{45}Ca$주입후(注入後) 30분간, 문맥혈중(門脈血中)의 $^{45}Ca$농도 측정은 15분간이었다. 이상의 실험조건에서 흰쥐에게 casein식(食)과 egg albumin식(食)을 급여하고 Ca흡수량을 비교한 결과, casein식(食)에 의해 2~5 배의 높은 Ca흡수효과를 보였으며, 문맥혈중 $^{45}Ca$농도로부터의 평가는 장(腸)loop로 부터의 평가보다 과소평가 되지만 비교연구에는 충분히 유효함을 보였다.

• 한국안광학회지
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• 제5권1호
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• pp.199-203
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• 2000

콘택트렌즈 표면의 미세한 흠집이나 뜯김 등의 흠과 콘택트렌즈 edge부분의 연마상태나 파손여부를 식별하기 위해서는 배율이 커야하며, 또한 왜곡수차와 색수차가 제거되어야만 한다. 본 연구에 사용된 콘택트렌즈 분석기 "CONTACT LENS ANALYZER CA-20"은 표면검사에 적합한 16배의 큰 배율과 왜곡수차가 우선 제거된 우수한 분석기라고 말할 수 있다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
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• pp.345-346
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• 2009

본 연구는 TG/DTA, MIP 장비를 활용한 콘크리트의 미세정량분석시, Ca(OH)$_2$량 및 미세공극구조 분석 결과값의 편차가 큰 것에 주목하여, 시료의 채취 위치가 분석결과에 영향을 미친다고 판단하여 시료의 채취 위치에 따른 미세정량분석 결과를 평가하였다. 그 결과 시료의 채취 위치에 따라 외부(P-1)에서 내부(P-3)일수록 Ca(OH)$_2$이 증가하며 공극량은 감소하는 것을 확인하였다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2006년도 총회 및 춘계학술발표회
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• pp.41-44
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• 2006

The objective of this study was to evaluate the stabilization of As and heavy metals in tailings from the Samkwang Au-Ag mine with $Ca(OH)_2$. In order to evaluate the stabilization ability of As and heavy metals in the tailings, column test was implemented with various conditions as 1) particle size of $Ca(OH)_2$, 2) mixing method and 3) flow rate of eluents during 60 days. The results showed that addition with 5% of $Ca(OH)_2$ in 1kg of the tailings had the most effective ability of stabilization up to 95%. In addition, stabilization ability of As and heavy metals in tailings was enhanced using a fine powder of $Ca(OH)_2$. Therefore, stabilization technology can be used as a remediation of As and heavy metals in mine wastes including tailings and a nearby soils from abandoned metal mines.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.371-374
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• 2005

In this study, calcium chloride($CaCl_2$), sodium chloride (NaCl), organic acids-containing deicer(NS 40, NS 100), mixed deicier($NaCl\;70\%\;+\;CaCl_{2}\;30\%,\;NS\;40\;70\%\;+\;CaCl_{2}\;30\%,\;NaCl\;70\%\;+\;NS\;40\;30\%,\;NS\;40\;70\%\;+\;NaCl\;30\%$) is investigated based on the laboratory test for deicing performance. Test items for deicing performance were ice melting and ice penetration, freezing point depressions and eutectic points, pH, thermal properties for selected deicing chemicals. As a test results, in case of the use chloride-containing deicier in area that concrete structures has subjected to freez-thaw reaction in winter season, it showed desirable method that use deicing chemicals mixed with optimum ratio rather than use one deicing chemicals when is consider to deicing performance and effects, corrosion of steel materials, freez-thaw resistance of concrete. When use various deicing chemicals mixed, NS40($70\%$)+Calcium chloride($30\%$) showed the best effective method.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.97-101
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• 1996

In this paper, We have studied internal quality incluiding chemical compositions, microscopic structrue and nonmetalic inclusion of test materials. We have analyzed dynamic characteristics of cutting resistence including tensile strength value, hardeness value, impact value etcs. We have compared chip treatments of test materials. In analyzing internal quality, all of test materials have typical ferrite+pearlite structure. But, nonmetallic inclusion have oxide and sulfide inclusion in medium carbon steels, mainly sulfide inclusion is existed in S-free cutting steels. In Ca+S-free cutting steels, calcium aluminate and sulfide complex inclusion, had low-melting points, as deformation of sulfide and oxide inclusion is existed. machining characteristics, cutting resistence is maximum in Ca+S-free cutting steels, minimum in medium carbon steels. Chip treatements are excellent in S-free cutting steels, similar to the Ca+S free cutting steels and medium carbon steels.

• 센서학회지
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• 제22권1호
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• pp.18-27
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• 2013

Real-time monitoring is one of the prime necessities in a weapon flight test that is required for the efficient and timely collection of large amounts of high-rate sampled data acquired by an event-trigger. The wireless sensor network is a good candidate to resolve this requirement, especially considering the inhospitable environment of a weapon flight test. In this paper, we propose a priority based multi-channel MAC protocol with CSMA/CA over a single radio for a real-time monitoring of a weapon flight test. Multi-channel transmissions of nodes can improve the network performance in wireless sensor networks. Our proposed MAC protocol has two operation modes: Normal mode and Priority Mode. In the normal mode, the node exploits the normal CSMA/CA mechanism. In the priority mode, the node has one of three grades - Class A, B, and C. The node uses a different CSMA/CA mechanism according to its grade that is determined by a signal level. High grade nodes can exploit more channels and lower backoff exponents than low ones, which allow high grade nodes to obtain more transmission opportunities. In addition, it can guarantee successful transmission of important data generated by high grade nodes. Simulation results show that the proposed MAC exhibits excellent performance in an event-triggered real-time application.

• Animal cells and systems
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• 제1권1호
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• pp.123-128
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• 1997

The characteristics of allelic polymorphisms of the two (CA)n microsatellite (p599 and ㅅ599) markers spanning the long arm of chromosome 5 were studied in 52 DNA samples from unrelated inhabitants of Seoul (Korea) by using the polymerase chain reaction (PCR) to investigate differences in allele frequencies between Korean and Caucasian populations. The 6 alleles were observed for p599 (CA)n with a polymorphism informative content (PIC) value of 0.71 and 9 alleles for ㅅ599 (CA)n with a PIC value of 0.82. The observed heterozygote frequencies of the loci were estimated to 0.730 and 0.846, respectively. Several allele frequencies of two loci showed significant differences between Korean and Caucasian populations. Genotype data from the two loci were consistent with the Hardy-Weinberg equilibrium by x2 test. Linkage disequilibrium between p599 (CA)n and ㅅ599 (CA)n loci was observed in x2 test between the observed and expected frequency of allelic association. The probability of matching calculated at each locus was 0.104 for p599 (CA)n and 0.043 for ㅅ599 (CA)n, respectively. These results demonstrate the need to determine populationspecific allele frequency distributions for polymorphic markers when performing genetic linkage studies in racially defined several populations.

• 한국식품영양과학회지
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• 제15권1호
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• pp.9-14
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• 1986

홍옥과 후지를 $3%O_2-2%CO_2$ 및 $4%O_2-3%CO_2$의 CA 저장조건에서 각각 8개월간 저장한 후 $20^{\circ}C$ 상대습도 70%의 외기에 방치시키면서 사과의 경도에 관련된 몇가지 변화를 저온 저장고에서 동기간 저장한 후 방치시킨 사과와 비교하였다. 저장후 $20^{\circ}C$에 방치한 사과의 총펙틴 함량과 경도는 방치기간이 경과함에 따라 수용성 펙틴의 함량과 polygalacturonase의 활성 증가에 반하여 감소하였다. 이러한 변화는 저온 저장한 사과가 CA 저장한 사과보다 심하였고 홍옥이 후지보다 현저하였는데 특히 방치 초기 5일동안에 더욱 심하였다. 한편 저온저장고에 저장한 홍옥 및 후지는 $20^{\circ}C$에서 5일정도 상품적 가치를 지니나 CA 저장한 홍옥은 이보다 5일, 후지는 10일 정도 더 상품성이 연장되는 것으로 관능검사 결과 나타났다.

• 대한안전경영과학회지
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• 제15권3호
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• pp.127-132
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• 2013

This study shows an air-purification test by the UV lamp on which TiO2 catalyst is deposited with glass fiber in the reactor chamber. This test was based on the fundamental data of air-purifier as assessing a removing ability on various contaminants such as CH3COOH, NH3, NO and SO2 as variation of the TiO2 coating, the wave of UV lamp, and the additive CaO. As a result, the highest decomposing removal ratio was shown when 5-times coated glass fiber was used. It can be due to the recombination reaction of electrons and electron-hole in the loaded CaO. Thus, the decomposing removal ratio increased as the recombination ratio decreased. In addition, it was confirmed that the decomposing removal ratio lowered when CaO was considerably deposited because it hided the lamp of OH-1 radical.