• Current Optics and Photonics
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• 제3권6호
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• pp.566-570
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• 2019

To investigate dependence of the sensitivity of THz metamaterials on the position of target dielectric materials, we functionalized the metamaterial gap with an adhesive polymer. A shift in resonance frequency occurs when polystyrene microbeads are deposited in the gap of the metamaterial's metal resonator pattern, while little change is observed when they are deposited on other areas of the metasurface. A two-dimensional mapping of the sensitivity, with a grid size of 1 ㎛, is obtained from a finite-difference time-domain simulation: The frequency shift is displayed as a function of the position of a target dielectric cube. The resulting sensitivity distribution clearly reveals the crucial role of the gap in sensing with metamaterials, which is consistent with the electric field distribution near the gap.

• Journal of Contemporary Eastern Asia
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• 제10권1호
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• pp.55-71
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• 2011

China has been experiencing high economic growth along with massive change in its industrial structure. How will the industrial structure change affect the Chinese economy? Similar changes were observed by Japan, when the Japanese banking system fell into a structural failure in terms of the inability to respond to the paradigm shift from "catching up" to "frontier economy." This paper is undertaken to highlight the lessons that China can learn from Japan's prolonged financial slump. We point out that big cities in China have already shifted to frontier economy and major provinces are on the same trend. We argue that in spite of economic reform reshaping the Chinese banking system, the financing pattern of state owned commercial banks (SOCB) is not in line with the industrial change. The Chinese banking system should be overhauled or transformed to respond to the increasing uncertainty along with the paradigm shift. Otherwise, China may fall into the same dilemma that Japan had faced in its industrial structure change.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.1768-1771
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• 2002

Automatic Transmission System(ATS) was designed to replace the human's manual operation of the gear box. So far, this system operates with the fixed shift pattern information. In this paper, new algorithm considering driver's operation tendency is proposed. Also, to get rid of the uselessly frequent shift of the ATS, the conditions and the status of the vehicle would be included for the evaluation in making a decision of shifting. A field test is done in a car equipped with the computer set connected to Transmission Control Units(TCU) to check the status of the test car, and it shows the excellency of the proposed algorithm.

• 대한산업공학회지
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• 제19권4호
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• pp.87-96
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• 1993

Spectrum analysis of surface electromyogram (FMG) signals is an effective approach to the study of localized muscular fatigue during isometric contraction. Many investigators have con firmed the frequency of the EMG signals being lowered during sustained contaction. In this study, the cyclic loading tasks were performed, and a comparison was made for the median power frequency shift pattern of the EMG signals with the sustained contraction of the same load. The median power frequency shift of the EMG signals for the cyclic loading task was found to be a part of that for the sustained contraction. Based on this result, a new muscle fatigue index was computed by normalizing the duration of the sustained contraction. A fatigue index was obtained as a function of exertion level and the work/rest schedule. With the proposed fatigue index, it is possible to evaluate or predict the degree of muscular fatigue for a physically demanding task.

• 대한산업공학회지
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• 제25권4호
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• pp.476-489
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• 1999

This paper is concerned with the deployment of core technologies for automotive steel sheets, based on the structural change of global market. The main tasks of automotive industry are to ensure the energy consumption, environmental regulations, and driving safety. With social and legal requirements, this study analyzes the market creation processes with technological innovations for hot rolled, cold rolled and galvanized steel sheets during the 20th century. It has been proven that the leading country in the steel industry was also that in the automotive. The purchaser-supplier relations of sheet materials are then patternized in the regional markets of the United States and Japan, who share nearly 50% of market in the world. According to the paradigm shift of globalization, the balance of power in Porter's 5 forces has been moved to the buyers', and both industries pursue Win-Win strategies such as the PNGV(Partnership for a New Generation of Vehicles ) and design-in system with the competition.

• 대한산업공학회지
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• 제6권1호
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• pp.9-15
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• 1980

By the mid 1960's the rate of productivity growth in the manufacturing industries of the United States reached the lowest level ever recorded in the American economy. As a result the cost-offsetting operations that had been a century-long part of cost minimizing became less feasible. U.S. manufacturing firins apparently embarked on a pattern of a cost pass-along management. Accounting for price variation as a function of a shift from cost minimizing to cost pass-along is the main subject of this investigation. An econometric model of the inflation process is presented which indicates a clear shift in the modal behavior of manufacturing industries from cost minimizing (1948-1964) to cost pass-along (1965-1975). The latter behavior, initially triggered by the drag of resource diversion on the productivity growth process, undermines the pressure toward productive efficiency that is at the core of industrial engineering, and at the center of U.S. industry's ability to remain competitive.

• Tribology and Lubricants
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• 제16권5호
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• pp.317-323
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• 2000

The film thickness and shape of elastohydrodynamic lubrication is measured by optical interferometer, which is the most precise method for EHL film measurement. However, the interpretation of the image pattern from optical viscometer is not simple for two-dimensional shape. A newly developed method of image processing makes it possible to evaluate the film thickness and shape in every point of contact region with two dimensional aspects. In this study, we captured the film shape of EHL film by the monochromatic incident light and analyzed the film thickness with the image processing method, which uses phase shift method. From the values of intensity in fringes, the qualitative feature of film thickness in the contact area are obtained by using Zernike polynomial

• 한국생활과학회지
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• 제15권6호
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• pp.1073-1081
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• 2006

The development of foundation garment pattern on the typical adult women's body was carried out. By means of the flatted body surface shell, the foundation garment pattern was developed. And its fitting test also performed. The results of this study can be summarized as follows; 1. The investigated Foundation basic pattern was made by the allowing the maximum bust size without any surplus since it was based on the tight-fitted model drawing technique. The investigated the completed pattern was designed in three parts of front and back body, including bust. 2. The result showed by overlapping the torso basic pattern foundation and body surface development selected from body almost the same except for the shift of dart position. 3. The result by overlapping basic pattern 3 existing basic patterns. On the basis of top-bust line showed that the setting up the volume of dart of bust and its waist affect the appearance of model. Especially, it was found that the above result was related to the bust and under bust line. 4. The result of the wearing test of 3 existing basic patterns and basic pattern of this study revealed that the mean values of whole items were higher than average in type P and type E. The fitting & position of under-bust line and extent of wrapping bust showed the high points in the current study and type of P. The result of evaluating the whole appearance in three points(front, side, back) showed different according to the every basic foundation garment pattern.

• Journal of Nutrition and Health
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• 제53권5호
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• pp.488-502
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• 2020

본 연구는 광주지역 산업체 근로자 738명을 대상으로 NQ-A를 측정하여 영양상태 및 식사의 질 수준을 파악하고 이에 관련된 요인을 확인하였다. 본 연구 대상자는 교대 근무자 496명, 비교대 근무자 242명으로 구성되었다. 근무 기간은 10년 이상이 64.9%, 남성 근로자가 81%, 연령대는 50대 이상이 31.6%를 차지하였다. 교육 수준은 대학 졸업 이상이 57.2%, 월평균 가계소득은 401-600만원인 경우가 48.2%로 가장 높은 비율이었고, 가구 구성은 결혼의 여부에 따라 가족과 함께인 가구가 75.9%였다. 대상자들의 근무 형태에 따라 교대 근무와 비교대 근무자로 나누어 분석한 결과 NQ-A와 영역별 점수는 비교대 근무자가 유의하게 높았다. 연구 대상자의 NQ-A 평균 점수는 45.3점이었고, 모니터링 필요 집단은 교대 근무자에서 91.3%로 유의하게 높았다. 연구 대상자의 영양지수에 영향을 미치는 요인은 근무형태, 성별, 연령, 교육 수준, 월평균 가계 소득, 가구 구성으로 나타났다. 비교대 근무자, 여성, 가족과 함께인 가구, 50대 이상, 월평균 가계 소득 600만원 이상의 경우가 NQ-A를 높이는 요인으로 확인되었다. 연구 대상자의 균형, 다양, 절제, 식행동 영역에 영향을 미치는 요인에 대한 확인 결과, 근무 형태는 균형, 다양, 절제 영역에 공통적으로 가장 큰 영향을 미치는 요인이었고, 성별은 식행동 영역에 가장 큰 영향을 미치는 것으로 조사되었다. 본 연구는 NQ-A 지수를 활용하여 일반 산업체 근로자의 영양상태와 관련 요인 균형, 다양, 절제, 식행동으로 나누어 세부적으로 평가하고 영양지수에 영향을 미치는 요인을 파악하여 구체적으로 식생활교육 프로그램의 방향을 제시했다는데 의미가 있으며, 산업보건에서 영양관리의 필요성 및 근무 형태와 성별에 따른 차별화된 관리와 지원이 필요함을 시사한다. 즉, 근무 형태와 성별에 따른 영양관리와 식생활 교육 프로그램 마련이 요구되며, 근로자가 육체적 정신적으로 건강한 생활을 영위하는 데 가치를 두고 식습관에 관심을 가질 수 있도록 하는 교육이 이루어져야 할 것이다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.803-806
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• 2007

TRNG (True Random Number Generator)를 테스트 하는 방법은 PRNG (Pseudo Random Number Generator)나 산술연산기를 비롯한 결정적 (deterministic) 소자에 대한 테스트와는 많이 틀려서, 새로운 개념과 방법론이 제시되어야 한다. 하드웨어적으로 결정적인 소자들은 패턴을 사용한 테스트 (ATPG; automatic test pattern generation)에 의해 커버가 될 수 있지만, 순수 난수는 발생 결과의 아날로그적인 특성에 의하여 자동 패턴 생성 방식에 의해 소자를 테스트하기가 불가능하다. 본 논문에서는 하드웨어와 소프트웨어를 결합한 테스트 방식으로 테스트 패턴에 연속적인 패턴의 변화를 주면서 통계적으로 관찰하는 방식인 Diehard test라는 테스트 방식을 연구, 분석하고, 순수 난수의 테스트 시 고려해야 할 주안점을 제안한다.