• 한국의류학회지
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• 제31권11호
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• pp.1611-1620
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• 2007

The precaution to spray with agricultural chemicals is very important, in particular personal protective equipment against pesticide in order to protect farmers# pesticide poisoning. The Ministry of Agriculture and Forestry has proclaimed the announcement of pesticide proof clothing(PPC) in 1983, and revised it in 1987. The announcement had many performance items to achieve the high-quality protective clothing for pesticide including weight, density, force strength, dimensional change(in washing and drying), fastness(dyeing, washing, sweating and rubbing) and water resistance of clothes. Announcement of the PPC has better durability and penetration resistance function than former days, but the plenty of farmers didn#t wear it because of the intolerable heat. To increase wearing rates, the pesticide proof clothing must be estimated the water-vapour resistance. From the results, the developed PPC with polyester treated water-repellent showed the more excellent comfort than an existing PPC with nylon coated polyurethane. But the developed PPC appeared to have the low water-vapour resistance. Therefore, it is suggested that the property of pesticide penetration must be evaluated through the field test in the future study.

• Journal of Nutrition and Health
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• 제45권5호
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• pp.462-469
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• 2012

We investigated dietary effects of prickly pear cactus (Opuntina ficus-indica) on plasma lipids, platelet aggregation (PA), hemolysis, plasma TBARS and liver enzymes. Twenty eight volunteer diving women in Jeju island had daily 20 g cactus tea containing 27% prickly pear cactus (PPC) powder for 4 weeks, and data for the study subjects were analyzed, on the basis of diagnostic criteria for blood pressure (BP)(${\geq}$ 140/90 mmHg), plasma cholesterol (${\geq}$ 200 mg/dL) and triglyceride (${\geq}$ 150 mg/dL). The subjects with higher BP had higher plasma total cholesterol (TC) and triglyceride (TG) concentrations than those with normal BP. Those with higher TC also had higher TG. Subjects with normal BP or normal TC had higher initial slope of PA than their higher counterpart in BP and TC. PPC intake decreased plasma TG in those with higher BP. PPC intake significantly decreased the elevated initial slope in groups with normal BP, TC, and TG. Hemolysis after PPC intake decreased significantly in all the subjects and plasma TBARS decreased in the subjects with higher plasma TC and higher TG. Glutamic-oxaloacetic transaminase (GOT) significantly increased and total bilirubin significantly decreased in all the subjects after PPC intake. The present study with diving women showed that beneficial effects of short term intake of prickly pear cactus might differ depending on the subject conditions in term of blood pressure, and plasma lipids. However, long term usage of prickly pear cactus may provide preventive effects of cardiovascular diseases to all the population, presumably by hypolipidemic, antithrombotic, and antioxidant actions of its bioactive flavonoids and soluble fiber.

• 디지털융복합연구
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• 제17권5호
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• pp.191-205
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• 2019

본 연구는 진성리더십의 이론적 및 실무적 발전을 촉진하기 위하여 진성리더십, 긍정심리자본, 팀워크역량 간의 관계를 살펴보고 그 관계상의 긍정심리자본의 매개효과를 검증하였다. 실증분석을 위해 종합병원 간호사 172명을 대상으로 자료를 수집하였다. 수집된 데이터에 가설적 관계를 검증하기 위해 SPSS 21.0을 활용하여 요인분석, 상관분석, 다중회귀분석, 매개회귀분석 등을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 진성리더십은 긍정심리자본뿐만 아니라 팀워크역량에 정(+)의 관계를 가지고 있으며, 둘째, 진성리더십과 팀워크역량 사이에 긍정심리자본은 부분적인 매개역할을 하는 것으로 나타났다. 이러한 연구 결과는 진성리더십의 작업팀에 대한 긍정적인 영향을 증명해주고 있으며 간호사 조직의 효과성 제고에 실무적인 시사점을 제공한다. 마지막으로 본 연구의 한계점을 지적하고 진성리더십과 진성리더십의 작업팀 영향에 대한 미래 연구를 위한 일부 연구방향들이 제안되었다.

• The Korean Journal of Physiology and Pharmacology
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• 제25권4호
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• pp.333-339
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• 2021

Injection lipolysis or mesotherapy gained popularity for local fat dissolve as an alternative to surgical liposuction. Phosphatidylcholine (PPC) and aminophyl-line (AMPL) are commonly used compounds for mesotherapy, but their efficacy and safety as lipolytic agents have been controversial. Glycerophosphocholine (GPC) is a choline precursor structurally similar to PPC, and thus introduced in aesthetics as an alternative for PPC. This study aimed to evaluate the effects of GPC on adipocytes differentiation and lipolysis and compared those effects with PPC and AMPL using in vitro and in vivo models. Adipogenesis in 3T3-L1 was measured by Oil Red O staining. Lipolysis was assessed by measuring the amount of glycerol released in the culture media. To evaluate the lipolytic activity of GPC on a physiological condition, GPC was subcutaneously injected to one side of inguinal fat pads for 3 days. Lipolytic activity of GPC was assessed by hematoxylin and eosin staining in adipose tissue. GPC significantly suppressed adipocyte differentiation of 3T3-L1 in a concentration-dependent manner (22.3% inhibition at 4 mM of GPC compared to control). Moreover, when lipolysis was assessed by glycerol release in 3T3-L1 adipocytes, 6 mM of GPC stimulated glycerol release by two-fold over control. Subcutaneous injection of GPC into the inguinal fat pad of mice significantly reduced the mass of fat pad and the size of adipocytes of injected site, and these effects of GPC were more prominent over PPC and AMPL. Taken together, these results suggest that GPC is the potential therapeutic agent as a local fat reducer.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1990년도 봄 학술발표회 논문집
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• pp.108-115
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• 1990

This paper contains experimental studies on the flexural cracking behabior of PPC one-way slabs. Three post tensioned bonded PPC slabs with the same prestressing ratio and ultimate moment strength were tested. Based upon test results, this paper also presents the crack width prediction formula PPC slab. According to the crack theory developed mainly in Europe, crack width formula is given as the product of crack spacing and mean steel strain after decompression. Aaaaverage crack spacing formula is composed of many factors mainly such as concrete cover, concrete effective area in tension, sum of reinforcing bars perimeters and mixed reinforcements. In particular, it is very important to specify the bond characteristics of mixed reinforcements, since bond characteristics of PC bars are different from those of non-tensioned deformed bars. For this reason, a reduced bond coefficients for PS bars is employed in this study.

• 한국경영과학회지
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• 제16권2호
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• pp.125-125
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• 1991

This paper presents a framework for the hierarchical PPC(Production Planning and Control) in make-to-order environment with job shop. The characteristics of the environment are described as : 1) project with non-repetitive and individual production, 2) short delivery date, 3) process layout with large scales manufacturing. 4) job shops. The PPC in a make-to-order typically are organized along hierarchical fashions. A model is proposed for the hierarchical job shop scheduling based on new concepts of production system, work and worker organization. Then, a new integrated hierarchical framework is also developed for the PPC based on concepts of the proposed job shops scheduling model. Finally, the proposed framework has been implemented in the Electric Motor Manufacturing and the results showed good performance.

• Elastomers and Composites
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• 제52권1호
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• pp.81-85
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• 2017

In order to improve the water resistance, we synthesized waterborne polyurethane by using polyester polyol, poly(propylene carbonate) (PPC), 4,4'-dicyclohexylmethane diisocyanate ($H_{12}MDI$), and dimethylolpropionic acid (DMPA). The properties of the synthesized waterborne polyurethane using poly(propylene carbonate) (WPUP) were evaluated by FT-IR, $^1H-NMR$, GPC, DSC, TGA, and UTM. The mechanical properties increased while the adhesion properties decreased with the increase in the amount of PPC. The highest water resistance was shown when the ratio of polyester polyol to PPC was 9:1.

• 경영과학
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• 제16권2호
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• pp.125-135
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• 1999

This paper presents a framework for the hierarchical PPC(Production Planning and Control) in make-to-order environment with job shop. The characteristics of the environment are described as : 1) project with non-repetitive and individual production, 2) short delivery date, 3) process layout with large scales manufacturing. 4) job shops. The PPC in a make-to-order typically are organized along hierarchical fashions. A model is proposed for the hierarchical job shop scheduling based on new concepts of production system, work and worker organization. Then, a new integrated hierarchical framework is also developed for the PPC based on concepts of the proposed job shops scheduling model. Finally, the proposed framework has been implemented in the Electric Motor Manufacturing and the results showed good performance.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1997년도 가을 학술발표회 논문집
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• pp.171-178
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• 1997

This paper describes the application of discretized continuum-type optimality criteria (DCOC) for the multispan partially prestressed concrete beams. The cost of construction as objective function which includes the costs of concrete, prestressing steel, non-prestressing steel and formwork is minimized. The design constraints include limits on the maximum deflection, flexural and shear strengths, in addition to ductility requirements, and upper and lower bounds on design variables as stipulated by the design code. Based on Kuhn-Tucker necessary conditions, the optimality criteria are explicitly derived in terms of the design variables-effective depth, eccentricity of prestressing steel and non-prestressing steel ratio. The prestressing profile is prescribed by parabolic functions. The self-weight of the structure is included in the equilibrium equation of the real system, as is the secondary effect resulting from the prestressing force. Two numerical examples of multispan PPC beams with rectangular cross-section are solved to show the applicability and efficiency fo the DCOC-based technique.

• 한국식품조리과학회지
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• 제12권4호
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• pp.499-505
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• 1996

김치의 맛을 더욱 좋게 유지하면서 상품적인 가치를 높이는 한 가지 방법으로 김치 포장 용기를 개발하고자 본 연구에 착수하였다. 기존으로 사용되고 있는 PP(Polypropylene), PS(Polystyrene), PPC(Polypropylene+ceramic)와 본 연구에서 개발하고자 하는 용기인 3층으로 laminate 된 PPP(PETG+PS+PETG) 용기에 김치를 담고 6일간 발효시키면서 총젖산균수, pH, 산도, 색상, 포장내 기체조성과 자유용적, 그리고 관능적인 성질을 측정하여 비교한 결과는 다음과 같았다. 총젖산균수는 PP, PS, PPP 공기내의 김치는 발효 6시간 후부터 급증한 데 반하여 PPC는 24시간 후에 급증하였고 PPP의 것은 120시간까지도 높은 수가 유 지된 것으로 나타났다. pH는 발효 72시간에 모든 시료가 pH 4로 떨어졌으룩 PPP의 것은 발효 144시간까지 pH 4를 유지하여 다른 것보다 pH 저하가 다소 둔하였다. 색도에 있어서도 PP, PS, PPC 용기의 것이 발효48시간에 L b/a 값이 45.6-49로 떨어진 데 비하여 PPP는 53.21로 붉은색이 더 좋았고 5일 후에도 같은경향을 보였다. 또한 $CO_2$와 $O_2$의 존재량과 자유용적을 비교한 결과 PPP와 PPC가 $CO_2$량이 비교적 적고 내부자유용적의 팽창도가 높은 것으로 나타나 기체 투관성이 다른 용기에 비해 낮은 것을 알 수 있었다. 그리고 색, 풍미, 텍스쳐, 종합적인 기호도 등에 대한관능검사 결과에서도 PPP내의 김치가 발효 48시간까지 좋은 결과를 보였다. 또한 PPP 용기를 김치 포장용기로 사용하면 투명하므로 내용물의 종류와 상태를 용이하게 확인하여 선택을 확실하게 할 수 있게 하며 PP나 PS 용기보다 견고하여 내용물의 발효에 의한 팽 창시 파열되지 않아 유통기간 중 안전하며 김치의 품질도 좀 더 좋은 것으로 나타나 김치 포장용기로 적절하게 사용될 수 있을 것으로 사료된다.