• 한국산학기술학회논문지
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• 제19권6호
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• pp.440-446
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• 2018

본 논문은 고령인력이 조직 혁신에 미치는 효과와 연령 다양성이 이러한 관계를 어떻게 조절하는지를 중심으로 살펴본다. 지식경영 기반 관점에 근거하여, 본 연구는 기업 특유적 지식과 조직 내외부 사회적 연결망 측면에서 고령인력이 일정 정도 조직 혁신에 기여할 수 있을 것으로 보았다. 반면, 고령인력 비중이 지속적으로 늘어나게 되면 새로운 지식 창출관점에서 한계를 가질 수 있으므로 조직 혁신에 미치는 긍정적 효과보다는 부정적 효과가 보다 강하게 나타날 것으로 예상하였다. 이에 더하여, 고령인력과 조직 혁신 간 비선형적 관계를 조절하는 요인으로 연령 다양성의 효과에 대해 살펴보았는데, 본 연구는 새로운 지식의 창출이라는 측면에서 연령 다양성이 고령인력과 조직 혁신 간 비선형 관계를 조절할 것으로 예측하였다. 실증 분석을 실시한 결과, 예측한대로 고령인력과 조직 혁신은 역 U자 관계를 가지고 있었으며, 연령 다양성은 이러한 역 U자 관계를 조절하는 역할을 하는 것으로 나타났다. 이러한 이론적 논의와 실증 결과는 고령인력이 조직 혁신에 미치는 다양한 효과들을 보다 다각적으로 검증하고 이러한 관계에 영향을 줄 수 있는 보다 다양한 요인들에 대한 탐색이 이루어져야 함을 보여준다.

• 지식경영연구
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• 제18권2호
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• pp.85-102
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• 2017

With rapid development of information and communication technologies, open collaboration can be eased through the Internet. Open source software, as a representative area of open collaboration, is developed and adopted to various fields. In this research, based on organizational learning theory, we examine the impacts of exploration and exploitation on innovation performance in open source software development projects. We define knowledge exploration as a number of developers from outside organization and knowledge exploitation as the ratio of member of an organization who participated in an open source software project managed by the organization. For analysis, we collect data of 4794 projects from github which is a representative open source software development platform using Web crawler developed by Python. As a result, we find that excessive exploration has curvilinear (invers U-shape) relationship on project performance. On the other hand, exploitation with enough external developers will positively impact on project performance.

• 치과방사선
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• 제26권2호
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• pp.7-17
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• 1996

This study was performed to determine the postitional relationships of two lobes of parenchyma and to analysis the anatomical feature and its variations of duct on the panoramic views of the normal parotid glands in adults. Materials included 66 panoramic views and anterioposterior views of sialograms of selected persons and the radiograms of the gland experimentally reproduced on dry skull with lead foil and the reference images of computed tomograms of normal persons. Results were as follows : 1. On panoramic view of sialogram, the superficial lobe was revealed with totally being superimposed with the mandibular ramus and condyle and its tail portion superimposed with mandibular angle area, the deep lobe was revealed between the posterior border of the ramus and the mastoid process, and the isthmus was begin from the marked furcation off main duct and superimposed partially with the medial part of the deep lobe. 2, The mean length and the lateral extension of parenchyma was 63.18±8.05mm and 21.78±4.87mm respectively on panoramic view and showed no statistical relationship between them. 3. The main duct was generally perpendicular to the posterior border of ramus at middle portion and its configurations revealed 57,58％ of curvilinear type, 21.21％ sigmoid type, 15.15％ reverse sigmoid type. 4, The interlobular ducts of the deep lobe showed relatively well defined features between the mandibular ramus and the mastoid process.

• Advances in concrete construction
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• 제11권4호
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• pp.347-356
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• 2021

To address the limitation of the commonly used steam curing of reactive powder concrete (SC-RPC) in engineering, a preparation technology of normal curing reactive powder concrete (NC-RPC) is proposed. In this study, an experimental comparative research on the mechanical properties of NC-RPC and SC-RPC under uniaxial tension is conducted. Under the premise of giving full play to the ultra-high performance of RPC, the paper tries to explore whether normal curing can replace steam curing. The results show that various mechanical indexes of NC-RPC (e.g., tensile strength, ultimate tensile strain, elastic modulus and deformation performance) could basically reach the mechanical index values in steam curing at 28d age, some performance is even better at a longer age. So it affirms the feasibility of normal curing. In this paper, the influence of normal curing age on the tensile properties of RPC is discussed, and the relationship between each index and age is introduced in detail. Based on the experimental data, the tensile mechanism of RPC is analyzed theoretically, and two kinds of tensile constitutive models for RPC are proposed, one is curvilinear model, and another one is polygonal line model. The validity of the two models is further verified by the test results of others.

• The Plant Pathology Journal
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• 제19권3호
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• pp.129-132
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• 2003

Fusarium wilt of cucumber caused by Fusarium oxy-sporum f. sp. cucumerinum is a serious vascular disease worldwide. Biological control of Fusarium wilt in several crops has been accomplished by introducing non-pathogenic Fusarium sup. and other biocontrol agents in soil or in infection courts. In this study, quantitative models were used to determine the biocontrol efficacy of inundatively applied antagonist formulations and the length of their effectiveness in controlling Fusarium wilt of cucumber. Quantitative model of the form [Y=L (1${-exp}^{-kx}$)] best described the relationship between disease incidence (Y, %) and inoculum density (X) of isolates F51 and F55. Isolate F51 was selected as a more virulent isolate based on the extent of its effectiveness in causing the wilt disease. The degree of disease control (Xi/X) obtained with the density of the biocontrol agent (Z), was described by the model [Xi/X=A (1${-exp}^{-cz}$)]. The zeolite-based antagonist formulation amended with chitosan (ZAC) was better at lower rates of application and peaked at around 5 g/ kg of the potting medium, whereas the peat-based antagonist formulation (PA) peaked at around 10 g/kg of the potting medium. ZAC formulation provided significantly better suppression of Fusarium wilt as described by the curvilinear relationship of the type Y= a+bX+c$X^2$, where Y represents percent disease incidence and X represents sustaining effect of the biocontrol agent.

• Journal of the Korean Wood Science and Technology
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• 제28권1호
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• pp.18-27
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• 2000

목재와 목질재료는 물리적 및 기계적 성질에 큰 변이를 지니므로 표러쉬 문의 표면재을 동일한 재료로 제조하는 경우에도 주위 환경의 변화에 따라 틀어짐이 발생할 수 있다. 틀어짐을 예측하는데 필요한 치수변동계수(LMC)와 탄성계수 등은 ASTM 규정대신에 전건법과 동적 탄성계수로 추정할 수 있었다. 틀어짐과 LMC간 관계는 곡선적이지만, 틀어짐과 탄성계수간에는 선형관계를 나타내었다. 경질섬유판과 합판과 같은 표면재의 재료성질은 정규분포를 나타내었다. 그러나 그 변이는 경질섬유판보다 합판이 훨씬 더 컸다. 확율분포 모수와 틀어짐의 관계를 이용해 몬테카롤로 시뮬레이션을 한 결과 틀어짐의 발생 크기에 따른 프러쉬 문의 불량율을 예측할 수 있었다.

• 한국가금학회지
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• 제7권1호
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• pp.1-11
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• 1980

연중 산란수의 6-8%가 산란시부터 소비자에게 이르는 사이에 파란으로 된다. 이들 파란의 대부분은 난각의 품질과 난각파열에 영향을 준다고 판단되는 여러 가지 생물적, 환경적, 관리적 요인들과의 상호관계에 의해 발생되고 있다. 이제까지 논의된 몇 가지 파란발생 요인들을 보면 닭의 연령, 계사의 온도와 습도, 케이지 씨스템과 케이지바닥의 설계, 케이지에 사용된 재료의 종류, 1일 채란회수, 그리고 가장 중요하게 각종 기구의 원활한 작동여부와 정비상태이다. 이 중에서 닭의 연령, 유전적 체질, 환경온도, 기구의 설계와 정비유지의 양부가 파란생성에 영향하는 중요 요인이라 하겠다. 난각의 품질과 난각파열 간에는 곡선관계에 있으므로 난각질의 조그마한 차이가 파란발생빈도에는 커다란 영향을 미치게 된바. 이제까지 보고된 문헌에 의하면 파란발생 빈도는 l-2%의 낮은 수준에서 35%의 높은 수준에 이르기까지 넓은 변이를 보여주고 있다.

• Fisheries and Aquatic Sciences
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• 제26권5호
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• pp.318-335
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• 2023

It is important to understand the biological aspects of fish for fishing management. This study was conducted from February through October 2021. A total of 1,629 fishes were collected using different fishing gears. The length-weight relationship is a power curve for all fishes and showed a significant (r² > 0.8). All fishes revealed a negative allometric growth pattern except Labeobarbus intermedius. Oreochromis niloticus (1.714 ± 0.009) was found in better condition than other fish species (analysis of variance [ANOVA], p < 0.05). The length at maturity was 24.0 cm and 25.4 cm total length (TL), 28.9 cm and 28.2 cm fork length, and 53.2 cm and 57.5 cm TL for females and males of O. niloticus, L. intermedius and Clarias gariepinus, respectively. Fecundity was ranged between 100-947 eggs/g with absolute fecundity (AF) of 468-3,832 eggs, 200-1,000 eggs/g with AF of 2,752-136,420 eggs, and 505-900 eggs/g with AF of 2,000-6,404 eggs for O. niloticus, C. gariepinus, and L. intermedius, respectively. Their respective mean fecundity was 1,490 ± 91, 23,330 ± 5,070, and 3,096 ± 273 eggs, respectively. Mean fecundity revealed a significant variation between size classes and species (ANOVA, p < 0.05). The fecundity length and fecundity-body weight relationships except (O. niloticus) of fishes were curvilinear while the gonad weight (GW)-fecundity relationship was linear for all fish species. The fecundity was moderately associated with increasing length than body weight, and GW for all fishes (r² > 0.6). In conclusion, a tangible management setup is required to sustain the use of fish in the reservoir.

• Fisheries and Aquatic Sciences
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• 제27권2호
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• pp.100-110
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• 2024

Biometric evaluation and reproductive biology of Oreochromis niloticus were studied from Geray Reservoir. Between November 2021 and August 2022, 316 O. niloticus specimens were collected from this reservoir. The observed male to female sex ratio was 1:1.14, which was statistically insignificant compared with the hypothetical 1:1 sex ratio (X² = 1.27, p > 0.05). The length-weight relationship was curvilinear with allometric growth (b < 3) and statistically significant from the expected isometric growth pattern (b = 3). The regression equation for females was TW = 0.0264TL^2.72 (r² = 0.90, n = 168), males (TW = 0.0183TL^2.79, r² = 0.93, n = 148), and combined sexes (TW = 0.0229TL^2.76, r² = 0.91, n = 316). Gonadosomatic index (GSI) ranged from 0.8 to 1.4 (males) and 1.8 to 4.9 (females). The breeding season lasted from March to June, with a GSI peak in April. Fecundity ranged from 279 to 1,528 eggs./fish, with a mean of 1,025 eggs./fish. The correlation between absolute fecundity and length was more significant (F = 0.76TL^2.8, R² = 0.94, p < 0.05) than with weight (F = 17.683TW^0.71, R² = 0.92, p < 0.05). This study provides basic information on the biology of O. niloticus in the Geray Reservoir for future fishery management tools for the conservation and utilization of this valuable freshwater fish.

• Asian-Australasian Journal of Animal Sciences
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• 제16권7호
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• pp.1049-1054
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• 2003

A group of Hanwoo (Korean cattle) steers (n=14,386) was sampled from a commercial abattoir located in Seoul over one year period (spring, summer, autumn and winter) and their carcass traits were collected. Carcass traits assessed by an official meat grader comprised degree of marbling, meat color, fat color, texture and maturity for quality grade, and back fat thickness, ribeye area and carcass weight for yield grade. A heavier carcass with a higher marbling score, more red meat color and white fat color received better quality grade (p<0.05). Regression analysis showed that the marbling score was the strongest attribute (partial $R^2=0.88$) for quality grade. Lighter carcasses with a thinner back fat and larger ribeye area received higher yield grade score. The back fat thickness was the most negative determinant of yield grade (Partial $R^2=-0.66$). The slaughter season had a little effect on quality and yield grades. As slaughter weight increased, back fat thickness and ribeye area increased linearly, whereas marbling score reached its asymptotic level at approximately 570 kg. As a consequence, quality grade showed a considerable improvement up to 570 kg, but increases in slaughter weight afterward showed a little benefit on quality grade. There was a clear curvilinear relationship between slaughter weight and yield grade in that the yield grade reached its highest point at approximately 490 kg and decreased afterward. These results suggested that 570kg at the age of 24 months might be the economic slaughter weight for quality grade but 490 kg for yield grade.