• 한국통신학회논문지
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• 제21권2호
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• pp.301-312
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• 1996

A new approach is presented for recovering the 3-D shape from shading image. Photometric Stereo Method (PSM) is generally based on the direct illumination. In this paper, the reflectance function is derived by introduceing the indirect diffuse illumination in PSM and then applied to hybrid reflectance model which consists fo two components; the Lambertian reflectance and the speclar reflectance. Under the hybrid reflectance model and the indirect diffuse illumination circumstances, the 3-D shape of object can be recovered from the suface normal vector extracted from the surface roughness, the surface reflectance ratio, and the intensity value of a pixel. This method is rapid because of using the reference table and simplifies the restriction condition about the reflectance function existing in prior studies. The recovery efficiency in our method is better than that in prior studies. Also, this method is applied to various types of surfaces by defining general reflectance function.

• 대한전자공학회논문지
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• 제27권4호
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• pp.571-579
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• 1990

A dynamic relocation algorithm for non-deterministic process graph in distributed computer systems is proposed. A method is represented for determining the optimal policy for processing a process tree. A general database query request is modelled by a process tree which represent a set of subprocesses together with their precedence relationship. The process allocation model is based on operating cost which is a function fo selection of site for processing operation, data reduction function and file size. By using expected values of parameters for non-deterministic process tree, the process graph and optimal policy that yield minimum operating cost are determined. As process is relocated according to threshold value and new information of parameters after the execution of low level process for non-deterministic process graph, the assigned state that approximate to optiaml solution is obtained. The proposed algorihtm is heuristic By performing algorithm for sample problems, it is shown that the proposed algorithm is good in obtaining optimal solution.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제48권11호
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• pp.597-603
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• 1999

Due to its simple construction, operation steadiness and low cost, claw pole step motor is widely used for OA machine and automobile. This paper deals with analysis fo claw pole motor, especially eyeing to dynamic characteristics. To analyze dynamic characteristics of claw pole step motor, torque development in each angular step of rotor are surveyed and torque equation is drived using permeance method. To adopt the airgap MMF, the magnetic equivalent circuit of the motor is introduced. On the base of the magnetic equivalent circuit, the air gap flux equation is derived. To get a optimum design of the motor, the torque characteristic is studied in variation of coil data and remanence value of permanent magnetic material.

• 한국세라믹학회지
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• 제37권8호
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• pp.792-798
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• 2000

Alumina composites reinforced with SiC whiskers only or combinded with TiC particles were prepared by hot-pressing at 1850$^{\circ}C$ for 1h. The mechanical properties and microstructures of composites were investigated in this study. By of addition either 20 vol% SiC whiskers or 20 vol% TiC particles, the flexural strength fo alumina was increased from 360 MPa to 650 MPa or 730 MPa, respectively, and the KIC was also increased from 3.5 MPa$.$m1/2 to 5.5MPa$.$m1/2 or 4.4MPa$.$m1/2, respectively. In the case of composites with 20 vol% SiC whiskers and 2 vol% TiC particles. The flexural strength and KIC showed relatively high value of 800 MPa and 5.3MPa$.$m1/2, respectively. The improvement of mechanical properties was considered to be due to both the smaller average grain size and the crack deflection.

• 전자통신동향분석
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• 제39권3호
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• pp.98-106
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• 2024

Advanced packaging is emerging as a core technology owing to the increasing demand for multifunctional and highly integrated semiconductors to achieve low power and high performance following digital transformation. It may allow to overcome current limitations of semiconductor process miniaturization and enables single packaging of individual devices. The introduction of advanced packaging facilitates the integration of various chips into one device, and it is emerging as a competitive edge in the industry with high added value, possibly replacing traditional packaging that focuses on electrical connections and the protection of semiconductor devices.

• 한국식품영양학회지
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• 제16권3호
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• pp.180-186
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• 2003

가열살균 처리시의 온도값을 이용하여 다양한 미생물들의 가열살균 효과를 D값, z값 등의 미생물 내열성 특성치와 kinetic 모델 및 수식을 이용하여 살균치 계산을 컴퓨터를 이용하여 수행함으로써 target 미생물의 살균정도를 예측하고자, Excel과 Visual Basic을 연동하여 작성된 시스템으로 Excel을 기본으로 사용한 프로그램을 개발하였다. 가열살균 target 미생물을 선택하고자 야채식품을 기반으로 하는 식품에서의 미생물을 검토하여, 내열성인 가장 큰 호기성 포자형성균인 Bacillus spp. 계통이 산을 형성하여 맛 등의 품질을 저하시켜 변패를 유발하며, 위생적인 면에서 포자수를 줄이거나 사멸할 필요가 있어서 선택하였다. 병원성 균 중에서 $D_{121.1}$이 0.0065분, z값이 7.8$^{\circ}C$인 Bacillus cereus와 부패현상 관련 균 중에서 $D_{121.1}$이 0.5분, z값이 12$^{\circ}C$인 Bacillus subtilis를 대상으로 해서 개발되었으며, 필요시에는 D값과 z값을 직접 대입하므로서, 여러 가지 미생물에 대해서도 적용이 가능하게 하였다.

• 한국수산과학회지
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• 제49권4호
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• pp.427-435
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• 2016

The effects of salt solution and chlorella on the quality of canned oyster, Crassostrea gigas, were evaluated to obtain basic data regarding the processing of two canned oyster products. In canned oyster processing, the shucked oyster meat was steamed for 20 min and then drained. Then, each can (301-3) was filled with 90 g boiled oyster in 60 mL 1.5% salt solution for the control samples or 30 mL 1.5% salt solution and 30 mL chlorella culture medium for the experimental samples. All canned products were sealed using a vacuum seamer and then sterilized to Fo values of 6-12 min in a steam retort system at 118℃. The viable bacteria count, proximate composition, pH, salinity, yield, volatile basic nitrogen (VBN), amino-nitrogen, thiobarbituric acid (TBA), mineral, color value, free amino acid levels, hardness, and sensory evaluation of the two canned products were measured under various sterilization conditions. There were no significant differences in the physical or chemical factors and little difference in the overall acceptance of the control and experimental samples.

• 한국조경학회지
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• 제29권2호
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• pp.22-31
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• 2001

The purpose of this paper is to investigate in resources of natural recreation forest(RNRF) developed both publicly and privately in order to answer the research question: what are the differences in RNRF development between public and private developers. After reviewing the literature, the developer´s decision-making and motivation of investment, and the planning process of natural recreation forest, We constructed the conceptual framework and have formulated the hypothesis of this research. We had obtained data through a questionnaire, which surveyed of 625 visitors at 9 of the 72 natural recreation forests in Korea in 1999, We have analyzed the data using the mean difference test and logistic regression method. We found that 1) the overall quality of resource elements in RNRF has been development excellent except for the sociocultural element of recreational resources, and public recreation forest have been of higher quality than that fo private development, 20 in bivariate analysis, all the variables on quality of RNRF by public developers have turned out to be better than those of private ones, 3) in multivariate analysis, such variable as valley and water, forest and wildness area, wild life, and landscape have been statistically significant at one percent level, 4) the higher the value of valley and water, the higher the probability of public development, while the higher the value of other variables excluding water and valley, the more likelihood the recreational forest is developed by a private developer, and 5) forest and wildness area has been turned out to be the most important independent variable in contributing to the value of dependent variable. The research results suggest that 1) the differences in the quality of resource elements in RNRF developed by public and private body be considered in the planning and design process in order to develop diverse activities to make use of the resource potential, and 2) considering the resource characteristics of private natural recreation forest and the motivation of private developers, private natural recreation forest will possibly be more dynamic and dynamic attractive areas. It is recommended that the difference in the degree of visitor´s satisfaction between public and private development be examined.

• 생물정신의학
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• 제1권1호
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• pp.88-97
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• 1994

Many evidences are compatible with the correlation between the inhibition of [$^3H$] imipramine([$^3H$]IMI) and [$^3H$]paroxetine([$^3H$]PAT) binding to the 5-hydroxytryptamine(5-HT) transporter complex and the 5-HT uptake of 5-HT neurons and platelets, and most antidepressants have been shown to inhibit the [$^3H$]IMI and [$^3H$]PAT binding and the neuronal 5-HT uptake. However, several paradoxical research findings led to doubt about the pharmacological significance of the [$^3H$]IMI and [$^3H$]PAT binding sites. This study was carried to clarify the correlation between the [$^3H$]IMI and [$^3H$]PAT binding parameters and the tissue 5-HT content or/and [$^3H$]5-HT uptake in the rabbit platelet, which contains 40 times ad much 5-HT as that of human platelet and shows the 10 fold higher $B_{max}$ of the 5-HT transporter binding to a 5-HT uptake inhibitor. The rabbits were treated for 28 days with amitriptyline(4mg/kg/day : AP), fluoxetine(0.5mg/kg/day : FO), and sertraline(0.5mg/kg/day : SA) via an Alzet osmotic pump implanted for constant infusion. The [$^3H$]IMI binding $B_{max}$ and $K_d$ of the rabbit platelets were $6.4{\pm}1.2$pmol/mg protein and $10.9{\pm}2.1$nM and those in the [$^3H$]PAT binding were $8.6{\pm}1.1$pmol/mg protein and $1.6{\pm}0.3$nM, respectively. AP slightly increased $B_{max}$ of [$^3H$]IMI binding and both [$^3H$]IMI binding and [$^3H$]PAT binding $K_d$, and i contrast, it slightly decreased $B_{max}$ of [$^3H$]PAT binding. FO Slightly increased $K_d$ of both and [$^3H$]IMI and [$^3H$]PAT binding and slightly decreased $B_{max}$ of [$^3H$]IMI and [$^3H$]PAT binding. SA produced the significant increase of [$^3H$]PAT binding $B_{max}$ and the slight increase of both [$^3H$]IMI and [$^3H$]PAT binding $K_d$ and in contrast, it slightly decreased $B_{max}$ and of [$^3H$]IMI binding. And, the $V_{max}$ and $K_m$ of platelet [$^3H$]5-HT uptake were $24.2{\pm}2.4$pmol/$10^8$ platelets/min and $3.3{\pm}0.3$nM, respectively. The $V_{max}$ was little affected by AP, FO, or SA, but the [$^3H$]5-HT uptake $K_m$ value was moderately increased by FO. However, the platelet 5-HT content was moderately decreased by all of the 5-HT uptake inhibitors used in this study. These results seem to be consistent with the allosterical and competitive interaction of 5-HT uptake inhibiting antidepressants with each other as well as 5-HT in the 5-HT transporter binding, and provide no support for the view that the potencies of 5-HT uptake inhibitors to inhibit the [$^3H$]IMI or [$^3H$]PAT binding with 5-HT transporter complex correlate with their antidepressant potencies.

• 한국축산식품학회지
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• 제32권4호
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• pp.476-482
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• 2012

본 실험은 부존사료자원을 토종닭에 이용하여 EPA 및 DHA와 같은 ${\omega}-3$계 다가불포화지방산을 함유하는 고품질 계육을 생산하기 위한 목적으로 실시하였다. 45일령의 재래종 암수탉을 공시하여 20일간 사양실험을 수행하였다. 일반시판사료를 사용한 대조구와 임자박 10% 첨가구(PM), 임자박 10% 및 아마종실 5% 첨가구(PM+FS), 임자박 10%, 아마종실 5% 그리고 어유 1% 첨가구(PM+FS+FO)로 나누어, 4처리 3반복 그리고 반복당 20수씩 총 240수를 공시하였다. 실험 종료 시체중, 증체량, 사료섭취량 및 사료 요구율 등 생산성과 관련된 항목에서는 처리간에 큰 차이는 관찰되지 않았다. 대조구에 비해 모든 시험구에서 산패도 수치가 약간 높게 나타났으나 처리간에 유의차는 인정되지 않았다. 계육 내의 지방산 조성을 조사한 결과에서 ${\omega}-6$계 불포화지방산의 비율은 처리간에 큰 차이가 관찰되지 않았다. 임자박, 아마종실 및 어유 첨가에 의해 ${\omega}-3$계 불포화지방산(C18:3 ${\omega}-3$, EPA, DHA)의 비율이 증가하는 경향 및 유의하게 증가하는 결과가 나타났다. 특히 EPA와 DHA는 어유를 첨가한 PM+FS+FO구에서 다른 구와 비교하여 유의하게 증가하였다. 본 연구의 결과, 임자박, 아마종실 및 어유를 일반시판사료에 적정량 혼합 급여하는 사료적 처리를 통해 재래종 닭에서 조직 내 총 ${\omega}-3$계 불포화지방산 및 DHA 함량을 증가시킬 수 있었으며, 이렇게 생산된 고부가가치 계육이 ${\omega}-3$계 불포화지방산의 좋은 공급원이 될 수 있을 것으로 사료되었다.