• Imaging Science in Dentistry
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• 제48권1호
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• pp.41-44
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• 2018

Purpose: To evaluate the effect of different numbers of basis images and the use of metal artifact reduction (MAR) on the production and reduction of artifacts in cone-beam computed tomography images. Materials and Methods: An acrylic resin phantom with a metal alloy sample was scanned, with 450 or 720 basis images and with or without MAR. Standard deviation values for the test areas (around the metal object) were obtained as a way of measuring artifact production. Two-way analysis of variance was used with a 5% significance level. Results: There was no significant difference in artifact production among the images obtained with different numbers of basis images without MAR (P=.985). MAR significantly reduced artifact production in the test areas only in the protocol using 720 basis images (P=.017). The protocol using 450 basis images with MAR showed no significant difference in artifact production when compared to the protocol using 720 basis images with MAR (P=.579). Conclusion: Protocols with a smaller number of basis images and with MAR activated are preferable for minimizing artifact production in tomographic images without exposing the patient to a greater radiation dose.

• 농촌계획
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• 제27권2호
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• pp.69-76
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• 2021

This study focuses on the relationship between ginseng production per area and meteorological factors. Four areas of major ginseng production are considered in the study. Chungcheongnam-do and Gyengsangbuk-do are selected as the original major production places and Gyeonggi-do and Kangwon-do are selected as the new major places. The meteorological factors applied for study are the average temperature, accumulated precipitation, and integrated sunshine hours. With the data collected across four areas, we used a panel data analysis. From the results of Hausman test, the fixed effects model allowing to control individual area effect is preferable to the random effects model. Based on the results of the fixed effects model, the accumulated precipitation statistically and significantly affect the decreases in ginseng production. Changes in the average temperature negatively affect ginseng production, but the value is not statistically significant. The integrated sunshine positively affect ginseng production, but the value is not statistically significant.

• 한국환경생태학회지
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• 제25권2호
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• pp.211-226
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• 2011

본 연구는 효과적인 송이산 관리를 위한 기초자료 확보를 위하여 강원도 양양군을 사례로 송이 생육환경특성을 고려한 소나무비오톱지도 작성을 목적으로 수행하였다. 연구방법은 송이와 관련한 국내 외 관련연구 고찰을 통해 송이 생육환경 특성을 도출하고, 송이 생산지의 식물군집구조와 토양환경을 파악하여 소나무비오톱 지도화 기준을 도출하였다. 지도화 기준은 송이가 발생할 수 있는 중요 요인을 지형 조건과 토양 조건, 식생 조건으로 구분하여 도출하였다. 전체 비오톱유형은 송이생산 가능지, 송이생산 잠재지로 크게 구분하였으며, 송이생산 가능지는 송이생산이 가능한 지형구조 및 토양구조 내 분포하는 소나무 비오톱으로 관목층에 기타 관목성상의 수종이 우점하는 흉고직경 30cm 미만의 단층구조의 소나무 비오톱과 아교목층에 소나무가 우점하는 다층구조의 소나무비오톱이 해당되었다. 송이생산잠재지는 송이생산이 가능한 지형구조 내에 분포하고 있으나 흉고직경 30cm 이상의 노령화된 소나무가 우점하는 단층구조의 소나무비오톱, 아교목층에 참나무류가 우점하는 소나무 비오톱, 관목층에 참나무류가 우점하는 단층구조의 소나무 비오톱 등 식생구조가 부적절한 지역으로 향후 식생관리를 통해 송이 발생 유도가 가능한 지역이었다. 연구결과 소나무비오톱은 송이생산 가능지 6개 유형, 송이생산 잠재지 9개 유형, 송이생산 불가능지 등 총 16개 유형으로 구분되었다. 송이생산 가능지는 전체 소나무림 중 총 $9.8km^2$, 15.48%이었고, 송이생산 잠재지는 $20.52km^2$, 32.42%이었으며, 송이생산 불가능지는 $32.97km^2$, 52.10%이었다.

• Asian-Australasian Journal of Animal Sciences
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• 제1권4호
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• pp.233-239
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• 1988

The base of Indian milk production is the millions of nondescript cows and buffaloes in rural areas, fed mainly on crop residues and agro-industrial wastes. The mainstay of the feeding system is straws and stovers. Therefore the approach to increase the fibrous residues utilisation for animal production was ideal and useful. The methods available for the above purpose were not found acceptable in rural areas owing to certain practical problems. The development of urea molasses block was, therefore aimed at solving the practical field problems. Urea Molasses Block has been developed as a feed supplement that can bring forth an effect of rumen manipulation thereby increase the conversion rate of feeds. The formula and process technology were thus developed. Before starting the mass production and popularisation the product was tested in controlled condition in farms and also in villages. Encouraged with the results the feed is now commercially manufactured under Indian Patent No. 156047.

• 대한가정학회지
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• 제37권11호
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• pp.19-32
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• 1999

This study analyzed the curricula of fashion related majors at 4-year colleges in the USA, UK, Japan and Hong Kong as well as in Korea and compared the characteristics of the Korean curriculum with those of the four countries. A total of 124 curricula from 103 colleges were collected. Courses were divided into eight categories (including industry and market information; materials; merchandise planning; design; production; distribution and selling; basics; and consumption) representing the production and distribution process of fashion business. There were differences in course offerings among the five countries. Overall, curricula in Korea emphasized design and production (construction) areas and showed not much differentiation among colleges. While industry and market information, merchandise planning, and production (management) areas were emphasized in the USA , differentiation/specialization by major was observed . UK and Hong Kong had well-specialized curricula by major Japan seemed to offer traditional and consumption oriented courses. Based on the findings, some propositions for the Korean fashion curriculum were discussed.

• 한국환경과학회지
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• 제30권2호
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• pp.145-152
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• 2021

Soil conservation management is necessary for sustainable agriculture, in highland areas, and cover crops are one of the best soil conservation methods for slopes. In this study, we evaluated the effects of alfalfa cultivation on maize production, as well as soil conservation and quality. There was an outstanding soil conservation effect with alfalfa cultivation in the fallow and maize growing seasons. In particular, alfalfa cultivation reduced soil loss by up to 98% compared with bare field. It also increased the activities of soil microorganisms and the supply of organic matter. Maize production with alfalfa cultivation showed no significant differences in yield. In conclusion, alfalfa is an advantageous perennial cover crop in highland agricultural slope areas, which can have positive effects on soil quality and conservation, as well as maize production.

• 한국식품저장유통학회지
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• 제6권1호
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• pp.7-10
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• 1999

Physicochemical properties of Satsuma mandarin(Citrus unshiu Marc. var. miyagawa) harvested in middle of November according to production areas of Cheju were investigated. Peel thickness of citrus fruits was ranged from 2.54mm to 3.13mm, and it was lower on fruits harvested in western areas than those of other areas in Cheju. Soluble solids were ranged from 10.1 to 12.0$^{\circ}$Brix, and it was lower on fruits harvested in southern areas. Acid contents of citrus juice were ranged from 1.28% to 1.42%, it was higher on fruits harvested in eastern areas, specific gravity of citrus fruits was ranged between 0.86 and 0.88. Flesh ratio was ranged from 75.1% to 77.6%, it was lower on fruits harvested in southern areas. Soluble solids, acid content and specific gravity harvested in southern areas of below 100m and over 150m sea level altitude were 11.8 and 11.2, 1.43% and 1.40%, 0.87 and 0.9, respectively. Fruits quality harvested in southern areas was better, compared to other harvest areas of Cheju.

• Asian-Australasian Journal of Animal Sciences
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• 제3권4호
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• pp.305-312
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• 1990

The seasonal changes in production, the systems of management and the seasonal climatic and feeding conditions are described for three farms representative of the major areas for growing fine-wool sheep in northern China. At all farms, summer and autumn were seasons of rapid liveweight gain and wool growth. In the winter and spring, during lactation, liveweight declined wool growth decreased by approximately 70%, and fibre diameter by 4 to 8 microns. The wool produced was characterized by a very low clean wool yield (39-51%). Greasy fleece weights ranged from 4.5 to 8.0 kg and average diameter of wool fibres from 20.5 to 23 microns. The number of lambs born per 100 ewes mated ranged from 79 to 95, lamb weights ranged from 3.8 to 4.5 kg, and weaning weights ranged from 17 to 25 kg. Overall, the patterns of sheep production were similar to those found in seasonally arid environments (such as in the mediterranean climatic zone). Yield of clean wool and therefore clean fleece weights were far below those in most other fine-wool producing areas of the world.

• 대한산업공학회지
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• 제1권1호
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• pp.41-56
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• 1975

In the past the pattern of business down-trend usually appeared in the form of, first, decrease in facility investment, then decrease in inventory level, followed by reduced level of consumption. But the pattern nowadays is becoming just the opposite, that is, first, consumption decrease, then inventory level increase, followed by restriction of facility investment. Also in the past, the greater effort was placed in strengthening of hardware areas through optimization and modernization of production means on the premise of sales. But lately software areas take most of the main effort to establish production mean with sales as its objective. Under these circumstances one of the real problems facing production activities today is the conflicting relationship between sales and production functions. This occurs due to differences of their view points. Then, in order to achieve maximum profit at the least cost, which is the ultimate objective of a production activity, the need arises to effectively coordinate sales demand and plant production capacity. For this purpose strong control means and function must be devised. In our case study example we illustrate a management technique for a combined planning function, of optimal coordination of product mixes utilizing a computerized linear programming model as control means of attaining maximum profit. It is hoped that this example help achieve some of corporate objectives.

• KSBB Journal
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• 제26권1호
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• pp.57-61
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• 2011

The principal objective of this study was to determine the optimal conditions for the production of biosurfactant by the indigenous bacterium, Pseudoalteromonas sp. HK-3, originating from oil-spilled areas. The relationship between total biosurfactant production and the factors affecting biosurfactant production were evaluated by statistical analysis using SPSS software. The effects of various supplemental carbon sources (e.g., glucose, dextrose, mannitol, citrate, acetate) on the maximal production of biosurfactant by the test culture of Pseudoalteromonas sp. HK-3 was then evaluated. As a result, mannitol was found in this study to be the best supplemental carbon source for the production of biosurfactant. A spot inoculation of crude cultural liquid containing the HK-3 cells generated the largest clear zone, whereas only small clear zones appeared around the spots inoculated with either supernatant only or cell pellets following centrifugation. Our results demonstrated that the HK-3 test culture supplemented with 2% mannitol at an initial pH of 6 generated the maximal amount of biosurfactant within 72 h of incubation.