• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.6
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• pp.744-750
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• 2020

In this paper, we propose a deep learning based transmit power control (TPC) scheme to improve the spectral and energy efficiency of wireless communication systems. In the wireless communication system, the positions of multiple transceivers follow a uniform distribution, and the performances of spectral and energy efficiency for the proposed TPC scheme are analyzed assuming the Nakagami fading channels. The proposed TPC scheme uses batch normalization to improve spectral and energy efficiency in deep learning based training. Through simulation, we compare the results of the spectral and energy efficiency of the proposed TPC scheme and the conventional one for various area sizes that limit the position range of the transceivers and Nakagami fading factors. Comparing the performance results, we verify that the proposed scheme provides better performance than the conventional one.

• Korea journal of population studies
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• v.29 no.1
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• pp.133-156
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• 2006

This paper tries to explore the overall profile of Korean female labor force over the period of 1960-2000. A particular emphasis is put on portraying major over-time characteristics of female labor force, following five different political regimes--that of Park, J.H.(1960 and 1970s), of Chon D.H. (early and late 1980s), of Roh T.W. (late 1980-early 1990s), of Kim,Y.S. (early 1990-1ate 1990s), and of Kim. D. J. (late 1990-early 2000s), respectively. Discussions have centered around: 1) utilization of young single girls from rural areas during the early industrialization process of 1960-1985; 2) the beginning of married women's entry into labor market and issues of the socalled &M-curve& thesis in Korean experiences since 1990s; 3) the emergence and enlargement of non-regular workers; and 4) the launching of labor related legal measures such as the Equal Employment Act of 1988 and its successive revisions, the Maternity Leave Acts, the On-the-Job Chi1dcare Centers, and the prohibition of sexual harassments on the job setting, and so on. All in all, although it is undeniable that the Korean female labor force has experienced much progress over the period of time in terms of &equality and protection& issues, overall industrial reality we are facing with has not been so prosperous in the sense that most women workers have become the victims of industrial polarization, as time goes by.

• Journal of the Korean Institute of Landscape Architecture
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• v.37 no.4
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• pp.1-11
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• 2009

This study was intended to set development priorities for five undeveloped neighborhood parks scattered throughout the downtown area of Cheongju City using a PDPI(Park Development Pressure Index). In order to calculate the PDPI, this study employed an additive integration method. The PDPI was graded from 1 to 5, based on the evaluation scores in accordance with nine indicators selected through literature reviews and interviews with public officials. The indicators have been classified into three categories: physical environment, utilization possibility, and facility distribution. The indicators are as follows: 1) 'altitude and inclination' and 'NDVI' as physical environment indicators; 2) 'ratio of residential area', 'forecasted utility population', 'undeveloped period', 'redevelopment near parks', 'ratio of area divided by main streets', reflecting utilization possibility; and 3) 'Distance between Neighborhood Parks' and 'Distribution of alternative facilities' as facility distribution. The following results were found: 1) three neighborhood parks including 'Sagic 2', 'Sachen', and 'Dangsan' were ranked in the first grade of PDPI; and, 2) one neighborhood park 'Samsungdang' was ranked in the fifth grade of PDPI. The above results mean that among undeveloped neighborhood parks, three have been exposed to extremely strong park development pressure, and that while two neighborhood parks have had strong exposure to park development pressure due to potential users according to their close location to Sagic Ro, an east-west main axis of Cheongju City, one neighborhood park has had weak exposure to development pressure because of the close location to 'Chuungbuk National University' and a lack of residential areas, showing a low possibility for development.

• The Transactions of the Korea Information Processing Society
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• v.13 no.4
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• pp.199-207
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• 2024

Local reservoirs are crucial sources for agricultural water supply, necessitating stable water level management to prepare for extreme climate conditions such as droughts. Water level prediction is significantly influenced by local climate characteristics, such as localized rainfall, as well as seasonal factors including cropping times, making it essential to understand the correlation between input and output data as much as selecting an appropriate prediction model. In this study, extensive multivariate data from over 400 reservoirs in Jeollabuk-do from 1991 to 2022 was utilized to train and validate a water level prediction model that comprehensively reflects the complex hydrological and climatological environmental factors of each reservoir, and to analyze the impact of each input feature on the prediction performance of water levels. Instead of focusing on improvements in water level performance through neural network structures, the study adopts a basic Feedforward Neural Network composed of fully connected layers, batch normalization, dropout, and activation functions, focusing on the correlation between multivariate input data and prediction performance. Additionally, most existing studies only present short-term prediction performance on a daily basis, which is not suitable for practical environments that require medium to long-term predictions, such as 10 days or a month. Therefore, this study measured the water level prediction performance up to one month ahead through a recursive method that uses daily prediction values as the next input. The experiment identified performance changes according to the prediction period and analyzed the impact of each input feature on the overall performance based on an Ablation study.

• 대한예방의학회:학술대회논문집
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• 2002.05a
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• pp.73-83
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• 2002

우리 사회에서 일정 정도 이상의 사회와 가정에서의 기능상의 부적응을 초래하는 정신적 문제는 경제활동인구에 있어 가장 흔한 보건의료상의 문제일 것으로 추측되고 있으나, 현재까지는 정신보건제도 마련에 있어 가장 극심한 부적응을 보이는 정신적 장애를 지닌 환자를 위주로 수용시설과 지역사회에서의 재활과 관리에 그 초점을 두어 왔다. 즉 직업스트레스와 같은 일시적인 사회심리적 갈등으로 인한 신체증상의 호소나 알을 및 약물중독으로 인한 사고의 발생으로부터 일생동안 관리되어야 하는 지능저하나 학습장애와 같은 만성적인 문제에 이르기까지 다양한 스펙트럼을 보이는 사업장과 지역사회에서의 정신적 문제들 중 그 일부만이 제도적으로 관리되어 왔다. 실제 그 동안 직장 내 정신보건문제에 대한 행정적 관심은 일부 장애인의 취업 문제를 제외하고는 없었다고 하여야 할 것이다. 그러나 한편으로 우리 사회의 산업구조와 경제사회적 조건의 변화에 따른 노동내용과 조건상 유연화의 증대가 많은 직장에서 노동강화로 이어진다는 점, 그리고 가족 및 교류집단을 비롯한 전통적인 사회적 지지구조가 와해되고 있다는 점과 정신적 문제로 인한 기능상 부적응의 척도가 한편으로 사회적 가치관의 변화에 따라 계속 그 영역이 넓어지는 방향으로 변화하고 있다는 점등에서 직장 내 정신보건 문제는 앞으로 더욱 그 비중이 커질 것으로 판단되고 있다. 문제의 심각성에 대한 관심이 요구되는 현재의 시점에서 제도적 접근에 대한 검토 또한 시작되어야 할 것으로 판단되고 있다. 현재까지 기업 내에서 이루어지고 있는 정신보건관리의 현황을 단편적으로 파악해 보았을 때, 단지 일부 기업에서 취업시 내지는 부서 배치시 성격검사를 비롯하여 적성검사를 실시하고 있으며, 기업윤리확보 차원에서 비정규적으로 사기앙양을 주목적으로 하는 집단적인 교육이나 단체훈련이 이루어지고 있으나, 정신심리적 문제를 개인적 차원에서 그리고 또한 조직적 차원에서 체계화된 프로그램으로 관리하고 있는 사례는 아직 없다. 앞으로 직장 내 정신보건문제에 대하여 제도적인 접근을 하기 위하여서는 다음과 같은 세가지 조건들이 구비되어야 할 것으로 판단된다. 첫 번째로 문제점 그 자체의 내용과 그 규모에 대한 정확한 파악과 예측이 가능하여야 한다. 즉 제도 전체의 운영을 객관적으로 평가하고 개선할 수 있는 기제가 함께 있어야 제도가 실제적인 기능을 할 수 있다는 최소한의 목적이 달성될 수 있다. 두 번째로 문제점의 관리를 위한 효과적인 개입내용 및 개입지점의 확보가 가능하여야 한다. 특히 직장 내에서 수행할 수 있는 프로그램이 개발되어야 하며, 이는 시범사업과 시장을 통한 소비자, 즉 사업주들의 자발적인 선택을 통하여 검토되고 걸려져야만 한다. 마지막으로 제도 운영의 대상, 특히 정신보건문제를 안고 있는 노동자들의 자발적인 동의가 확보될 수 있어야 한다. 이는 정신적 문제가 안고 있는 편견과 그로 인한 차별이 가져다주는 문제를 함께 고려하면서 제도가 운영되어야 하며, 이에 있어 제도 운영상 노동자들의 주체적인 참여가 필요하기 때문이다. 이상 고려되는 직장 내 정신보건문제에 대한 제도적 접근을 담기 위하여서는 프로그램 개발이나 전문가 집단의 양성과 같은 단순한 기술적 접근과 이들의 인허가 및 사업화에 따른 적용기준 및 의무의 설정과 같은 제도적 접근에 그쳐서는 그 실효성을 담보하지 못할 것으로 판단된다. 보다 중요한 것은 이러한 정신보건문제에 대한 노사의 공감대를 이루어 내는 것이며, 사회 전반적인 인식의 확산과 더불어 바람직한 관리모습에 대한 사회적 가치관을 도출해 내는 것이 제도적인 접근의 성공을 보장할 수 있는 기반 조건이 될 것이다. 이러한 점에 있어 정신보건문제를 바라보는 기존의 가치관이 부정적이고 고착화된 모습만을 강조하였으나, 이제는 점차 긍정적이 사회활동에 수반되는 역동적인 모습으로서 비추어지는 것이 많아진다는 측면에서 그 전망을 밝게 하여 주고 있다.

• Journal of the Institute of Convergence Signal Processing
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• v.12 no.4
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• pp.341-347
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• 2011

This paper presents the performance evaluation. optimal design. and complex obstacle detection of an overlapped ultrasonic sensor ring by introducing a new concept of effective beam width. It is assumed that a set of ultrasonic sensors of the same type are arranged along a circle of nonzero radius at regular spacings with their beams overlapped. First, the global positional uncertainty of an overlapped ultrasonic sensor ring is expressed by the average value of local positional uncertainty over the entire obstacle detection range. The effective beam width of an overlapped ultrasonic sensor ring is assessed as the beam width of a single ultrasonic sensor having the same amount of global positional uncertainty, from which a normalized obstacle detection performance index is defined. Second. using the defined index, the design parameters of an overlapped ultrasonic sensor ring are optimized for minimal positional uncertainty in obstacle detection. For a given number of ultrasonic sensors, the optimal radius of an overlapped ultrasonic sensor ring is determined, and for a given radius of an overlapped ultrasonic sensor ring, the optimal number of ultrasonic sensors is determined. Third, the decision rules of positional uncertainty zone for multiple obstacle detection are provided based on the inequality relationships among obstacle distances by three adjacent ultrasonic sensors. Using the provided rules, the obstacle outline detection is performed in a rather complex environment consisting of several obstacles of different shapes.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.2
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• pp.458-468
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• 2019

This research attempted to estimate monthly sales of food and beverage at the passenger terminal of Incheon int'l airport from June of 2015 to December 2020. This paper used ARIMA-Intervention model which can estimate the change of the sales amount suggesting the predicted monthly food and beverage sales revenue. The intervention variable was travel-ban policy against south Korea from P.R. China since July 2016 to December 2017 due to THAAD in south Korea. According to ARIMA, it was found normal predicted sales amount showed the slow growth increase rate until 2020 due to the effect of intervened variable. However, the monthly food sales in July and August 2019 was 20.3 and 21.2 billion KRW respectively. Each amount would increase even more in 2020 and the amount would increase to 21.4 and 22.1 billion KRW. The sales amount in 2019 would be 7.7 and 8.1 billion KRW and climb up 7.9 and 8.2 billion KRW in 2020. It was expected LCC passengers tend to spend more money for F&B at airport due to no meal or drink service of LCC or the paid-in meal and beverage service of LCC. The growth of sales of food and beverate will be accompanied with the growth of LCC according to estimated data.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.9
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• pp.955-960
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• 2008

We investigated and estimated at the characteristics of decomposition and mineralization of benomyl using a design of experiment(DOE) based on the general factorial design in an E-beam process, and also the main factors(variables) with benomyl concentration(X$_1$) and E-beam irradiation(X$_2$) which consisted of 5 levels in each factor was set up to estimate the prediction model and the optimization conditions. At frist, the benomyl in all treatment combinations except 17 and 18 trials was almost degraded and the difference in the decomposition of benomyl in the 3 blocks was not significant(p > 0.05, one-way ANOVA). However, the % of benomyl mineralization was 46%(block 1), 36.7%(block 2) and 22%(block 3) and showed the significant difference of the % that between each block(p < 0.05). The linear regression equations of benomyl mineralization in each block were also estimated as followed; block 1(Y$_1$ = 0.024X$_1$ + 34.1(R$^2$ = 0.929)), block 2(Y$_2$ = 0.026X$_2$ + 23.1(R$^2$ = 0.976)) and block 3(Y$_3$ = 0.034X$_3$ + 6.2(R$^2$ = 0.98)). The normality of benomyl mineralization obtained from Anderson-Darling test in all treatment conditions was satisfied(p > 0.05). The results of prediction model and optimization point using the canonical analysis in order to obtain the optimal operation conditions were Y = 39.96 - 9.36X$_1$ + 0.03X$_2$ - 10.67X$_1{^2}$ - 0.001X$_2{^2}$ + 0.011X$_1$X$_2$(R$^2$ = 96.3%, Adjusted R$^2$ = 94.8%) and 57.3% at 0.55 mg/L and 950 Gy, respectively. A Microtox test using V. fischeri showed that the toxicity, expressed as the inhibition(%), was reduced almost completely after an E-beam irradiation, whereas the inhibition(%) for 0.5 mg/L, 1 mg/L and 1.5 mg/L was 10.25%, 20.14% and 26.2% in the initial reactions in the absence of an E-beam illumination.