• 정보처리학회논문지A
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• 제9A권2호
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• pp.231-240
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• 2002

본 논문에서는 독립적으로 스케쥴링할 수 있는 VLIW 명령어들을 소개함으로써, 컴파일러와 프로세서에서의 스케줄링 작업을 더욱 균등하게 분배할 수 있는 프로세서 구조를 제안하였다. 제안한 APVLIW(Aggressively Packed VLIW) 프로세서의 목표는 자료종속성을 포함한 VLIW 명령어들을 독립적으로 스케줄링이다. APVLIW 프로세서는 기존의 VLIW 코드로부터 대부분의 NOP(No Operations)과 LNOP(Long NOPs) 명령어들을 제거함으로써 압축된 형태의 긴명령어 그룹을 생성한다. 본 논문에서 제안된 APVLIW 프로세서는 여러 개의 연산처리기와 동적 스케줄러의 쌍들과 자료종속성 정보를 사용하여 긴명령어내의 각 명령어를 독립적으로 스케줄링할 수 있다. 이러한 스케줄링 기법은 특히 루프를 포함한 프로그램을 실행할 때 효과적이다. 실험 결과를 통해서 캐시크기의 변화와 벤치마크 프로그램에 상관없이 APVLIW 프로세서가 VLIM 프로세서에 비하여 성능이 향상됨을 확인하였다.

• 생명과학회지
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• 제10권4호
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• pp.362-364
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• 2000

Opuntia ficus-indca(Op) extract has been claimed to have several therapeutic properties in oriental medicine including anti-inflammatory and anti-rheumatoid arthritis effects. Little is known of its effect on the activation of immune cells such as T cells and macrophages. To evaluate the functional effect of Op extract on immune cells, we examined whether Op extract stimulates the proliferation of T cells and the secretion of cytokines including IL-1 beta, IL-6 and tumor necrosis factor-alpha in THP-1 cell lines by RT-PCR. Op extract significantly enhanced the proliferation of T cell clone(D10S). Transcription of cytokines including IL-1 beta, IL-6, and TNF-alpha peaked 6 hrs after exposure to Op extract(100g/ml) in the THP-1 cell line and declined and declined thereafter. In an experiment to test the dose dependency of transcription of cytokines, transcription increased at a dose of 10 g/ml and the maximum expression was obtained at 100 g/ml, 6 hrs after exposure to Op extract. These findings suggest that Op extract is a potent stimulant of immune cells including T cells and macrophages, which acts by stimulating T cell proliferation and upregulating cytokines. These phenomena imply that some edible plants may be beneficial to living animals through the activation of immune functions.

• 한국안전학회지
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• 제16권4호
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• pp.194-199
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• 2001

The present situation of Korea already shone various symptoms of the aged society, and many kinds of data reported by the National Statistical Office demonstrate those facts. However, to my regret, sufficient efforts for aged workers are not taken in the area of industrial safety. In this research, work arrangement and industrial accidents of middle-aged and aged workers over last 5 years were analyzed. According to research results, proportion of industrial accidents involved middle-aged and aged workers was as high as 40%, and that of aged workers alone was so high as 25%. In addition, proportion of accidents were higher than that of worker population f3r aged wetters. Considering ages, it was demonstrated that as workers get older, mean number of accidents shows the tendency of going higher, and that as years go by, mean lost work-days are increasing regardless of age group. Main accident types were Fall followed by Slip, and Work-Related Disease, furthermore proportion of Slip was highest than any other types for aged workers. Based upon these results, it was emphasized thai careful attention should be paid to functional characteristics of aged workers, and that modification of accident prevention policy would be necessary.

• 보건행정학회지
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• 제2권2호
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• pp.33-56
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• 1992

The objectives of this research are (i) to review the functional and financial distribution of public health adminstration between central and local governments, (ii) to find out, based on economic criteria, optimal distribution required to fullfil local need for public health, and finally, (iii) to suggest policy implications in health area in face of the newly arising local autonomy system in Korea. Judging from data on government expenditures and tax revenues, public health administration in Korea is highly concentrated into central government, both functionlally and financially. High dependency of public health on central government has often been critisized that local residents can not participate in the decision making process for local health problems. This study, however, shows that localization of public health administration does not necessarily result in efficient and equitable allocation of resource to satisfy local demand for public health. From this point of view, two eccnomic criteria are suggested, i.e. external effect and economies of scle, as distributive criteria of roles in public health administration between local and central government. In addition, superiority of central concentration of public health administration to localization is emphasized in that public health in a wide sense contains the nature of public good and is part of compulsory socil security system. As a consequence, planned intervention by government is desirable.

• 한국콘텐츠학회논문지
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• 제19권2호
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• pp.469-476
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• 2019

로봇의 움직임은 3차원 공간상의 다관절 좌표계의 회전 및 이송으로 표현된다. 이러한 좌표계 모델링을 위해 동차 변환 행렬의 관계식으로 표현하나 복잡한 3차원 공간상의 움직임을 고려하여 시각화 기법을 이용한 시뮬레이션 환경 기반의 모델링 및 생성한 동작의 확인이 필수적이다. 기존 시뮬레이션 환경의 경우, 플랫폼 의존도가 높으면 정해진 명령어의 수행으로 구성되어 사용성 및 확장의 한계성이 있었다. 본 논문에서는, 웹 기반의 3차원 시뮬레이션 환경을 구축하고, 소형 웹 서버 모듈과 사용성이 용이한 Python 스크립트의 연동 방식을 통해 높은 사용자 접근성을 얻고자 한다. 또한 로봇 제어를 위한 비선형 모델의 적용 사례를 통해 제안된 시스템의 연산 능력, 프로세스 관리 방식의 성능 및 사용자 스크립트 연동을 통한 확장성을 검증하고자 한다.

• Steel and Composite Structures
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• 제49권6호
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• pp.633-643
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• 2023

In this study, the natural frequencies of Functional Graded Materials (FGM) plates are predicted using Artificial Neural Network (ANN). A model based on Third-order Shear Deformation Theory (TSDT) and FEM is used to train the ANN model. Different training methods are tested to simulate input and output dependency. As this is a parametric model, several architectures and optimization algorithms were tested. The proposed model allows us to minimize the CPU time to evaluate candidate material properties for FGM plate material selection and demonstrate their influence on dynamic behavior. Consequently, the time required for the FGM design process (candidate materials for material selection) and the geometric optimization of the FGM structure would remain reasonable. The ANN model can help industries to produce FGM plates with good mechanical properties of the selected materials. I addition, this model can be used to directly predict vibration behavior by testing a large number of FGM plates, representing all possible combinations of metals and ceramics in today's industry, without having to solve any eigenvalue problems.

• 대한간호학회지
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• 제45권2호
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• pp.202-210
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• 2015

Purpose: The purpose of this study was to describe depression, caregiving burden and the correlation of the two variables in the families of patients with amyotrophic lateral sclerosis (ALS) and to clarify factors predicting caregiving burden. Methods: A descriptive and cross-sectional study was conducted with 139 family members who provided care to patients with ALS. The characteristics of patients and families, Korean-Beck Depression Inventory (K-BDI), Korean version of Zarit Burden Interview (K-ZBI) and Korean-Amyotrophic Lateral Sclerosis Functional Rating Scale - Revised (K-ALSFRS-R) were used as study measures. Results: The mean score for K-BDI was 19.39 out of 63 suggesting sub-clinical depression and 38.2% of the family members exhibited depression. The mean score for K-ZBI was 66.03 out of 88. The predictors for K-ZBI were K-BDI, age of family member, length of time spent per day in caring, relationship to patient and K-ALSFRS-R. Conclusion: The results of this study suggest that levels of depression and caregiving burden are high among family members caring for patients with ALS. As depression is associated with caregiving burden, screening and emotional supports should be provided to reduce the burden of care for these family. Support programs to alleviate the care burden are also needed, considering family demographics, time per day in caring giving and K-ALSFRS-R.

• 대한수의학회지
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• 제43권2호
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• pp.195-202
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• 2003

Chitosan is known to have antibacterial, antitumorogenic, hypolipidemic and immunopotentiating activities, hence finding diverse uses as a component in varying functional foodstuffs. However, some investigators reported it caused mineral absoiption inhibition and excess coagulation. From the chemical viewpoint, conventional chitosans are high-molecule polymers lacking water solubility, which could be related with their possible toxicity. A newly developed low- molecule water soluble chitosan is thought to have low toxicity compared to conventional chitosans. But no investigation was carried out to evaluate its toxicity. In this study, a 28-day subacute oral toxicity study of the water-soluble chitosan was performed in Sprague-Dawley rats of both sexes. Each 36 male and female rats were orally administered with 500, 1,000 and 2,000 mg/kg/day for 28 consecutive days, respectively. Clinical parameters (growth rate, feed and water consumption, daily inspection, urine analysis) during the 28 days indicated the water-soluble chitosan did not induce any abnonnal changes. There were no abnormal findings due to the administration of the test substance in gross and microscopic findings. We had not found alteration in absolute and relative organ weight between the control and treated groups, with only exception in the liver but lacking dose-dependency. The results of hematology and serum biochemistry examination revealed that no treatment related changes were between control and all dose groups. In conclusion, it was suggested that subacute toxicity of the water-soluble chitosan was low and the no-observed adverse effect level was considered to be over 2,000 mg/kg in rats.

• 인터넷정보학회논문지
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• 제9권5호
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• pp.85-97
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• 2008

최근 서비스 지향 시스템이 시스템 기능적 단위인 서비스들을 재사용함으로 해서 개발 시간과 노력을 줄이는 특성 때문에 더욱 중요하게 부각되고 있다. 서비스의 재사용은 서비스들 간의 느슨한 결합에 의하여 효과적으로 이루어질 수 있고 서비스의 느슨한 결합은 컴포넌트 기반 시스템에 의존된다. 즉, 컴포넌트 기반 시스템은 클래스 간의 상호 의존이 강한 클래스들을 그룹화 하여 도출하고 서비스 지향 시스템의 서비스는 컴포넌트 기반 시스템에 의존되어 설계된다. 따라서 효율적인 컴포넌트 기반 시스템 및 서비스 지향 시스템 설계를 위해서는 클래스 간의 결합도를 좀 더 정확히 측정할 수 있는 메트릭이 요구된다. 본 논문에서, 우리는 클래스 간의 구조적 특성, 동적 특성 그리고 미 사이로 정규화된 값을 적용한 클래스 간의 결합 척도를 제안한다. 우리는 Briand이 제안한 공리에 의해서 제안된 메트릭이 이론적으로 타당함을 증명하고 사례 연구를 통하여 정확성과 실용성을 제시한다. 우리는 기존 메트릭스와의 비교 분석을 통해서 제안된 메트릭의 평가 결과를 제시한다.

• 한국연소학회지
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• 제17권1호
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• pp.48-57
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• 2012

Laminar lifted propane coflow-jet flames diluted with nitrogen were experimentally investigated to determine heat-loss-related self-excitation regimes in the flame stability map and elucidate the individual flame characteristics. There exists a critical lift-off height over which flame-stabilizing effect becomes minor, thereby causing a normal heat-loss-induced self-excitation with O(0.01 Hz). Air-coflowing can suppress the normal heat-loss-induced self-excitation through increase of a Peclet number; meanwhile it can enhance the normal heat-lossinduced self-excitation through reducing fuel concentration gradient and thereby decreasing the reaction rate of trailing diffusion flame. Below the critical lift-off height. the effect of flame stabilization is superior, leading to a coflow-modulated heat-loss-induced self-excitation with O(0.001 Hz). Over the critical lift-off height, the effect of reducing fuel concentration gradient is pronounced, so that the normal heat-loss-induced self-excitation is restored. A newly found prompt self-excitation, observed prior to a heat-loss-induced flame blowout, is discussed. Heat-loss-related self-excitations, obtained laminar lifted propane coflow-jet flames diluted with nitrogen, were characterized by the functional dependency of Strouhal number on related parameters. The critical lift-off height was also reasonably characterized by Peclet number and fuel mole fraction.