• Journal of Bio-Environment Control
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• v.31 no.1
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• pp.60-66
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• 2022

This study was conducted to investigate growth characteristics of paprika seedlings according to various qualities of LED light (red : blue = 10 : 0, red : blue = 8 : 2, red : blue = 2 : 8, white). Plant height and stem were significantly longer or thicker as red light ratio increased. Leaf area of paprika seedlings with red light was larger or no significant differences in a mixed light of red and blue. Dry weight of seedling was in the same with the result of leaf area. Seedlings with White light was significantly less than others in all characteristics. As red light ratio was increased, relative growth rate increased. As blue light ratio was increased, the net assimilation amount increased. Considering plant height, leaf area and production ability of dry matter per unit leaf area, the using mixed red and blue lights was suitable, especially at a mixed red : blue = 8 : 2.

• Journal of the Korea Society of Computer and Information
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• v.29 no.2
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• pp.101-108
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• 2024

AI-OCR (Artificial Intelligence Optical Character Recognition) combines OCR technology with Artificial Intelligence to overcome limitations that required human intervention. To enhance the performance of AI-OCR, training on diverse data sets is essential. However, the recognition rate declines when image colors have similar brightness levels. To solve this issue, this study employs Homomorphic filtering as a preprocessing step to clearly differentiate color levels, thereby increasing text recognition rates. While Homomorphic filtering is ideal for text extraction because of its ability to adjust the high and low frequency components of an image separately using a gamma value, it has the downside of requiring manual adjustments to the gamma value. This research proposes a range for gamma threshold values based on tests involving image contrast, brightness, and entropy. Experimental results using the proposed range of gamma values in Homomorphic filtering suggest a high likelihood for effective AI-OCR performance.

• Korean Journal of Ecology and Environment
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• v.36 no.4 s.105
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• pp.420-426
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• 2003

During a three-year study (2000-2002), dramatic changes in the phytoplankton biomass and high transparency were repeatedly observed during mid-spring in the lower part of the Nakdong River. Rotifers (Brachionus, Keratella, Polyarthra) , sharply increased toward the middle and end of spring. As hydrologic retention time increased (to near 20 days) and water temperature increased from $10^{\circ}C$ to > $20^{\circ}C$ toward the end of spring, small cladocerans noticeably increased. Once phytoplankton biomass passed their peak stage in the mid-spring, a short period (one or two weeks) of relatively low phytoplankton biomass and high Secchi transparencies occurred. Grazing by the zooplankton was highest in spring, thus, it seems that high grazing activities of zooplankton grazing regulated phytoplankton dynamics in the river. The results indicate that the role of zooplankton grazing in controlling the phytoplankton biomass becomes more important during the spring when river water is relatively stagnant.

• 한국벤처창업학회:학술대회논문집
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• 2018.04a
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• pp.61-64
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• 2018

우리나라 특성화고는 산업사회의 각 분야에서 종사할 유능한 인재를 양성하고 합리적이며 능률적인 직업인을 육성하려는 목표로 1998년에 도입되었다. 2010년에는 독일, 스위스, 오스트리아 등에서 자리 잡은 마이스터고 제도를 도입하여 변화를 시도하였다. 유럽에서의 마이스터고는 창업 성공률이 98%에 이를 정도로 창업의지가 높은 학생들로 구성되었다. 우리나라 또한 특성화고 학생들의 창업의지를 높이기 위해서 정부와 민간 기관에서 다양한 시도를 하였다. 창업진흥원의 기업가 마인드 확산 교육 비즈쿨(2002년), 한국시민자원봉사회의 특성화고 대상 창업 마인드 확산 경진대회 Be the CEO(2004년), 아산나눔재단과 어썸스쿨의 앙트러프러너십 교육 히어로스쿨(2014년) 등이 사례이다. 본 저자도 2011년부터 중소벤처기업부와 SK가 공동으로 주최하는 고교생 앱 개발경진대회를 직접 운영하면서 특성화고 학생들의 창업의지를 높이기 위한 방안에 대해 오랫동안 고민하였다. 본 연구에서는 특성화고 학생들의 앙트러프러너십이 창업의지에 미치는 영향을 연구하였다. 앙트러프러너십의 구성요소는 Miller(1983)가 주장한 위험감수성, 혁신성, 진취성에 기회인지를 추가하였다. 또한, 특성화고 학생들이 학교 교육과 다양한 외부활동을 통하여 접하고 있는 창업멘토링이 앙트러프러너십 구성요소와 창업의지간에 조절효과가 있는지 밝히고자 하였다. 이를 위해 전국 491개(2017년 말) 특성화고등학교 중 지역별로 안배하여 14개 학교 학생들을 대상으로 설문을 시행하였으며, 설문서 287부를 실증분석에 활용하였다. 연구분석 결과 특성화고 학생의 기회인지, 위험감수성, 혁신성, 진취성은 모두 창업의지에 긍정적인 영향을 미치는 것으로 나타났다. 한편 기회인지, 위험감수성 등 앙트러프러너십 요소와 창업의지 관계에서 창업멘토링의 조절효과는 진취성에만 긍정적인 영향을 미치는 것으로 나타났다. 창업멘토링의 조절효과가 진취성에만 국한된 것은 특성화고는 창업보다는 취업 중심의 정책을 운영 중이어서 앙트러프러너십은 높으나 창업의지가 희박한 학생이 많았고, 기존의 창업멘토링 내용이 학생들의 창업의지를 높이는데 실제적인 도움이 되지 못하였으며, 창업을 가로막는 제도 때문에 멘토링 만으로는 창업의지를 높이는데 한계가 존재하였다. 본 연구의 결과가 우리나라 특성화고 학생들의 창업의지를 높이는 방안에 대한 연구를 촉발하는데 조그만 보탬이 되기를 바란다. 또한, 창업의지가 높은 특성화고 학생들이 창업을 실행할 수 있는 환경이 구축되고, 특성화고가 취업중심의 정책에서 창업친화적인 정책으로 개선하는 데 촉매제가 되기를 바란다.

• Journal of Internet Computing and Services
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• v.15 no.4
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• pp.1-8
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• 2014

In wireless body sensor system(WB-SNSs), unlike existing sensor network system, the size of device is small and amount of battery is considerably limited. And various channel environments can be made by link channel characteristic, human movements, sensor placements, transmission power control(TPC) algorithms and so on. In this paper, therefore we take diverse experiments with totally considerated environments to overcome these restrictions and to manage the energy efficiently and find the value of target received signal strength indicator(RSSI) based on diverse factors such as human movements, sensor placements, and TPC algorithms. And we conduct analysis in terms of energy consumption and packet delivery rate(PDR) based on the experimental results. Through these analysis, we compare and evaluate the efficiency according to setup values of Target RSSI and Target RSSI range suitable for wireless body sensor network system.

• Journal of the Korean Society of Radiology
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• v.16 no.3
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• pp.351-356
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• 2022

The purpose of this study was to evaluate the cancer incidence rate and provide basic data by measuring the photoneutron dose generated during intensity-modulated radiation therapy and volumetric modulated arc therapy used in radiation therapy for prostate cancer. The optically stimulated luminescence albedo neutron dosimeter for neutron measurement was placed on the Rando phantom in the abdomen and thyroid and photoneutron dose generated was measured. As a result of the study, intensity-modulated radiation therapy (7 portal) was measured to be higher than volumetric rotational radiation therapy in both abdominal and thyroid locations. When the cancer incidence rate was evaluated using the nominal risk coefficient of ICRP 103, the cancer incidence rate due to exposure to the colon and thyroid during intensity-modulated radiation therapy was 9.9 per 1,000 people, and volumetric rotational radiation therapy for 1,000 people. It was 3.5 per person. Based on the principle of ALARA (As low as reasonably archievable), it is considered to be a guideline for minimizing the exposure dose to normal organs in the establishment of a radiation treatment plan.

• 한국벤처창업학회:학술대회논문집
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• 2023.11a
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• pp.101-105
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• 2023

대한민국은 2017년 이후 저출산·고령화사회로 진입하였고 생산가능인구가 감소함에 따라 노동생산성이 낮아지고 있으며, 여성의 경력단절 문제가 심각한 사회문제로 대두되고 있다. 정부에서는 여성가족부와 고용노동부가 함께 여성의 경력단절 예방과 해결을 위해 다양한 지원창업과 경제활동을 장려하고 있지만 현실에서의 재취업장벽과 열악한 노동환경, 일과 가정의 양립 문제 등으로 인해 경력단절 여성들 특히, 고스펙·고학력의 여성들은 취업이 아닌 창업을 선택하고 있으나 창업의 성공률은 그다지 높지 않아 다양한 대비책이 요구되는 실정이다. 여성 기업가는 창업부터 성장하기까지 수많은 위험요소에 노출되어 있으며 이러한 위험요소를 체계적으로 관리하고 극복하는 노하우를 쌓아 잘 활용하였을 때 경제활동의 핵심주축으로 성장할 수 있으며 창업이라는 혁신적이고 생산적인 활동으로 전환해 일자리 창출 및 기업의 혁신과 나아가서는 국가경제발전에 기여할 수 있는 토대가 될 수 있다. 본 연구의 목적은 여성의 기업가정신이 창업성과에 미치는 영향을 실증 분석하는데 있다. 경력단절여성 창업자를 대상으로 기업가정신이 창업성과에 미치는 영향과 회복탄력성이 조절효과를 갖는지 여부를 확인하고자 하였다. 여성기업가 특유의 소비자의 욕구를 세심하고 활동적으로 파악하여 생활밀착형 아이디어가 풍성면모와 창조적인 아이디어를 갖고 적극적으로 실행해보고자 하는 진취적인 성향과 회복탄력성이 창업성과에 영향을 미칠 것이라는 상황에 초점을 두고 연구모형을 설정하였다. 이를 위해, 기업가정신의 구성요소를 '혁신성', '진취성', '위험감수성'을 독립변수로 구성하였고, 창업성과의 주요구성요소인 '재무성과', '비재무성과'를 종속변수로 설정하였다. 또한 회복탄력성을 조절변수로하는 연구모형을 상정하였고 이는 여성의 기업가정신과 창업성과의 관계에서 회복탄력성의 조절효과여부를 확인하여 여성의 기업가정신교육과 회복탄력성의 중요성을 밝히고 활성화를 목적으로 하고 있다. 본 연구는 여성의 기업가정신이 창업성과에 긍정적 영향을 미친다는 것을 규명했다는 점에서 시사점을 갖는다. 심각한 사회문제로 떠오르고 있는 여성의 경력단절 문제를 해소하기 위해 향후 중소벤처기업부 및 여성가족부, 고용노동부 등에서는 여성창업자를 대상으로 체계적인 기업가정신교육과 회복탄력성에 관한 교육을 시행할 것을 제언한다.

• Journal of Sensor Science and Technology
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• v.9 no.3
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• pp.163-170
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• 2000

Optical frequency modulated fiber optic interferometric sensor was developed to sense the mechanical quantities, such as displacement, strain, force etc. It has been difficult to distinguish whether the increase of the mechanical quantities or the decrease of the quantities measured by the conventional fiber optic interferometric sensors because their signals only have a sinusoidal wave pattern related to the change of mechanical quantities. In this study, in order to measure the mechanical quantifies with the distinction of the changing direction of the quantities, the fiber of optic Michelson interferometric sensor was simply constructed by the laser light modulated with saw tooth wave pattern. The output signal of the sensor was controlled as the sinusoidal wave. The signal processing was based on the counting of the wave number of the output signal during constant time duration. The strain was determined by the cumulative value of the wave number producted by the gage factor. In order to verify the strain measurement capability of this sensor, the strain increase-decrease test was performed by universal testing machine installed with the aluminum specimen bonded with the fiber optic sensor and electrical strain gage. In the result of the test, the strain from the fiber optic sensor had a good agreement with the values from the electrical strain gage.

• The KIPS Transactions:PartC
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• v.9C no.4
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• pp.489-496
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• 2002

This study proposes a new polling algorithm allowing dynamic change in polling period based on line utilization prediction. Polling is the most important function in network monitoring, but excessive polling data causes rather serious congestion conditions of network when network is In congestion. Therefore, existing multiple polling algorithms decided network congestion or load of agent with previously performed polling Round Trip Time or line utilization, chanced polling period, and controlled polling traffic. But, this algorithm is to change the polling period based on the previous polling and does not reflect network conditions in the current time to be polled. A algorithm proposed in this study is to predict whether polling traffic exceeds threshold of line utilization on polling path based on the past data and to change the polling period with the prediction. In this study, utilization of each line configuring network was predicted with AR model and violation of threshold was presented in probability. In addition, suitability was evaluated by applying the proposed dynamic polling algorithm based on line utilization prediction to the actual network, reasonable level of threshold for line utilization and the violation probability of threshold were decided by experiment. Performance of this algorithm was maximized with these processes.

• Journal of the military operations research society of Korea
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• v.35 no.2
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• pp.33-49
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• 2009

The objective of this study is as follows. First, the hazard function on the failure probability density function of the K-1 tracked vehicles can be occurred in the form of the bathtub curve. Second, the failure mode may be different under two different operational situations. The research result shows that the bathtub curve can be fitted in the Weibull distribution, that assumes different shapes according to the specific stage of the system's life cycle. The K-1 tracked vehicle has a relatively high hazard(failure) rate at the time of its first service. The failure rate starts decreasing for a time immediately after it goes into service. After the break-in period, the surviving components have a fairly constant hazard rate. As the K-1 system ages, deterioration of its various parts takes place and the hazard rate starts Increasing. Second, the result shows the failure rate in the harsh operational environment is higher than that in the mild operational environment. In conclusion, the bathtub curve can be logically appropriate in establishing the depot overhaul cycle. Moreover, it is necessary for determining the right time of the depot overhaul to consider not only the age of defense equipment but also the different operational environment.