• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.1
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• pp.63-69
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• 2008

The position of stator is essential when a trapezoidal BLDC motor is drived. In this paper we proposed a novel sensorless drive system for the trapezoidal BLDC motor without hall sensors or encoders. The resistor Y-connecting method is used to obtain Back-emf of a trapezoidal BLDC motor. Especially, by using the new Back-emf filter circuit proposed in this paper the sensorless characteristic in low speed is improved. The prototype proposed system applied for a 100[W] rating BLDC motor is made and the propriety of the Back-EMF filter circuit is also verified.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.11
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• pp.1939-1946
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• 2008

The Oceanic ecosystem destruction caused by Water-Bloom, Jellyfish development, and Oil contamination in nation's waters becomes serious problem. For these reasons, the oceanic conditions are observed in air and on the water using helicopters and vessels. But, employing helicopters and vessels are limitted on a budget, and weather conditions. To overcome these problems, an unattended automated monitoring system not only gather all sorts of the oceanic condition in spite of bad weather, but save labor and oil costs. For each sensor connected in network and radiodetermination, location of sensors are verified in the tidal water to improve gathering informations.

• Journal of TMJ Balancing Medicine
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• v.8 no.1
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• pp.11-15
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• 2018

Recently, clinical efficacies of the intraoral balancing appliance therapy have been reported by several researchers, and it has been found that there are various kinds of diseases that can be effectively applied. However, studies on cerebrovascular disease, one of the main diseases with a high mortality rate, are still poorly reported, and studies of temporomandibular joint disorder (TMD)-induced changes in brain function suggest that cerebrovascular disease is more appropriate as an adaptive disorder of the temporomandibular joint (TMJ) balancing device. In the developed countries, the importance of research on the structure and function of the brain has been recognized and spurred on the related research. In Korea, the research on brain function and cognitive disorders should have promoted more massively. In order to regain its former reputation in the Korean medicine in the field of cerebrovascular disease, it should be spurred on basic research and clinical case studies. In addition, extensive and in-depth studies including animal studies are needed to establish the basis of underlying mechanisms of the TMJ balancing therapies.

• Journal of the Architectural Institute of Korea Structure & Construction
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• v.35 no.11
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• pp.163-170
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• 2019

Most of the current crack investigation work consists of visual inspection using simple measuring equipment such as crack scale. These methods involve the subjection of the inspector, which may lead to differences in the inspection results prepared by the inspector, and may lead to a large number of measurement errors. So, this study proposes an image-based crack detection method to enhance objectivity and efficiency of concrete crack investigation. In this study, YOLOv2 was used to determine the presence of cracks in the image information to ensure the speed and accuracy of detection for real-time analysis. In addition, we extracted shapes of cracks and calculated quantitatively, such as width and length using various image processing techniques. The results of this study will be used as a basis for the development of image-based facility defect diagnosis automation system.

• Herbal Formula Science
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• v.30 no.3
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• pp.165-174
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• 2022

Objectives: Donguibogam has helped progress of Eastern medicine across Asia and almost all of Korean medicine doctors still use the book as a classic reference. In this study, the prescriptions used in the treatment of stroke in Donguibogam are analyzed and the results are to be used for our subsequent studies. Methods: The frequency of use of prescriptions and the frequency of combination of medicines were analyzed from 89 prescriptions used in the Stroke chapter of Donguibogam, and it was intended to derive a combination prescription and a monosyllabic medicine that can be effectively used in the treatment of stroke for preclinical studies. Results: Ganghwalyupung-tang (羌活愈風湯) was the most mentioned prescription among 89 prescriptions, and Glycyrrhizae Radix et Rhizoma, among 165 species of medicines used in the 89 prescriptions, mixed in 55 prescriptions. However, considering the ratio of frequently used medicines, Sagunja-tang (四君子湯) was the highest in terms of composition ratio. Conclusions: Through this study, Glycyrrhizae Radix et Rhizoma and Sagunja-tang were selected as materials for our subsequent studies.

• Food Science and Preservation
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• v.6 no.2
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• pp.184-187
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• 1999

This study was conducted to analyze distribution properties on astringent Persimmons(Diosyros Kaki L). We selected one hundred farms in Sangju and Cheongdo regions, which ale major region of astringent persimmon production in Kyungpook province, and surveyed the selling type and the optimal farm scale. As a result of economic analysis, between manufacturing and selling of dried persimmon and producing and selling of fresh persimmon, the former made the higher gross receipts, income and net income recorded by 187, 136 and 162 respectively, comparing with the latter 100. So, manufacturing and selling of dried persimmon from astringent persimmon is a way of raising operation outcome.

• Journal of Sericultural and Entomological Science
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• v.2
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• pp.63-71
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• 1962

This work was to develope a more simple producing method of mulberry seedling with lower cost than the normal grafting method and the conclusions were found as; 1. There was no difference for the production of the seedling root when the young mulberry branch was graved in soil at the time it grown as 60∼80cm height. 2. It was found that the best result was obtained in case of 15 to 20 young branches of a mulberry shoot were graved instead of whole of them. 3. The seedling root quality of the clay soil graved was found better than the sand soil used, but root producing quantity was found as the same. 4. The fertilizing at the time of the young branch graving was not effective and also the continual fertilizing seemed not to be effective. 5. The seedlings root production was found that Kairyo Nezumigaeshi was best and Ichihei, Suwon Daeyop, Shimano-Uchi, Suwon No.3 and Suwon No.4 were followed of it. But Rosoh was found as poor. Morus alba L. was found as a better Species than Morus Lhou(Ser) Koidz and Morus bombycis Koidz for the production of the seedling root and its quality.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.1026-1030
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• 2005

조력발전 건설사업에서 우선적으로 고려되어야 할 사항은 조수간만에 의해 외해부와 조지부 사이를 이동하는 해수를 적절히 소통시키는 것이다. 예를 들어, 단조지 단류식 발전으로 창조시에 발전을 행할 경우, 발전을 행하면서 높아진 조지내의 수위를 다음 발전을 위해서 낮아진 외해수위를 이용하여 효과적으로 배수시키지 못하면 그 시설은 발전효율이 낮아지게 된다. 즉, 수문구조물의 목적은 주어진 조건 하에서 계획된 유량을 충분히 그리고 안전하게 배제시키는 것이다. 본 연구에서는 수문구조물에 대한 물받이의 길이와 경사의 변화에 의한 외해 조위와 시화호 수위차 조건에 따른 유량계수를 구해 배수능력을 검토하고자 하였다. 이를 위해 시화호를 실험대상으로 하여 수리모형을 1:25의 축척비로 제작하였다. 시화방조제를 기준으로 외해부의 조위와 조지부의 수위차를 8가지의 실험조건으로 한 연구를 수행하였다. 유량계수를 산정하기 위하여 8개 실험조건을 계획에서 제시된 수위-조위 조건에서 수위차 및 통수유량을 분배하여 결정하였고, 유량계수 산정식에 따라 상류 흐름 안정지점에서 유속-면적법에 의해서 유량을 측정하였다. 유속은 8개 지점에 대해서 측정하였고, 각 측정지점에서의 측선은 $3\~5$개이며, 측점은 $3\~4$점법으로 수행하였다. 시화호와 외해의 수위차가 1.011m일 때의 수문을 통과하는 유량을 비교한 결과 실험 II와 III의 통과유량은 각각 $1,571m^3/s$ 및 $1,515m^3/s$ 의서 실험 I 의 $587m^3/s$에 비해 통수능이 많이 개선되었음을 알 수 있다. 그림 1은 수위차별 유량곡선을 나타내는 것으로, 실험 II에서의 수문의 통수능이 실험 I의 통수능보다 크게 나타남을 알 수 있었다.>일 때가 밸브를 $60\%$와 $80\%$ 개폐시켰을 때보다 $0.3kg/cm^2,\;0.29kg/cm^2$ 낮게 나타나 밸브를 전체 개방 했을 때 관로내의 수압이 상수설계기준에 적합한 수압을 유지함을 알 수 있다. 상수관로 설계 기준에서는 관로내 수압을 $1.5\~4.0kg/cm^2$으로 나타내고 있는데 $6kg/cm^2$보다 과수압을 나타내는 경우가 $100\%$로 밸브를 개방하였을 때보다 $60\%,\;80\%$ 개방하였을 때가 더 빈번히 발생하고 있으므로 대상지역의 밸브 개폐는 $100\%$ 개방하는 것이 선계기준에 적합한 것으로 나타났다. 밸브 개폐에 따른 수압 변화를 모의한 결과 밸브 개폐도를 적절히 유지하여 필요수량의 확보 및 누수방지대책에 활용할 수 있을 것으로 판단된다.8R(mm)(r^2=0.84)$로 지수적으로 증가하는 경향을 나타내었다. 유거수량은 토성별로 양토를 1.0으로 기준할 때 사양토가 0.86으로 가장 작았고, 식양토 1.09, 식토 1.15로 평가되어 침투수에 비해 토성별 차이가 크게 나타났다. 이는 토성이 세립질일 수록 유거수의 저항이 작기 때문으로 생각된다. 경사에 따라서는 경사도가 증가할수록 증가하였으며 $10\% 경사일 때를 기준으로 $Ro(mm)=Ro_{10}{\times}0.797{\times}e^{-0.021s(\%)}$로 나타났다.천성 승모판 폐쇄 부전등을 초래하는 심각한 선천성 심질환이다. 그러나 진단 즉시 직접 좌관상동맥-대동맥 이식술로 수술적 교정을 해줌으로써 좋은 성적을 기대할 수 있음을 보여주었다.특히 교사들이 중요하게 인식하는 해방적

• Radiation Oncology Journal
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• v.10 no.1
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• pp.101-105
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• 1992

Authors performed a stereotactic radiosurgery with multiple noncoplanar convergent photon beams of linear accelerator (NELAC-1018 18 MeV, NEC) using a specially designed Yeungnam localization device for two patients with recurrent glioblastoma multiforme. One patient had 2 cm sized and the other 4 cm sized mass on the CT images. After single session of treatment with 15 and 20 Gy, headache was improved in a few days after radiosurgery with no remarkable untoward reactions. Our experience with these two patients were encouraging and we found that our localization device, which is easily adjustable and inexpensive, could be a valuable tool for stereotactic radiosurgery particularly in the treatment of recurrent brain tumor.

• The Journal of Internal Korean Medicine
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• v.39 no.4
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• pp.495-510
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• 2018

Objective: This study was designed to investigate the possibility of quantification of the diagnosis of abdominal coldness (AC) in patients with functional dyspepsia (FD). Methods: Forty-four patients with FD were enrolled in this study. Three Korean medicine doctors each randomly examined all abdomens. Diagnosis of AC was made by consensus of at least two of the doctors. Body temperature (oral by digital oral thermometer) and skin temperature (by digital infrared thermal imaging [DITI]) were measured, followed by administration of the Cold and Heat questionnaire (CHQ) and the Instrument of Pattern Identification for Functional Dyspepsia (IPIFD). Results: Of the 44 patients with FD, 22 were assigned to the AC group and 22 to the non-AC group. The concordance rate of diagnosis among the three doctors was 63.6% (28/44), with a ${\kappa}$ of 0.504, indicating means moderate agreement). Neither the oral nor the skin temperatures showed statistically significant differences between the AC and non-AC groups. However, the CHQ scores and 'Simultaneous Occurrence of Cold and Heat Syndromes pattern' scores of the IPIFD were higher in AC group and showed statistically significant differences (p=0.010 and 0.009). Conclusions: This is the first study conducting quantitative measurements of abdominal coldness in patients with FD. Although oral and skin temperature showed no statistical significance between AC and non-AC groups, the concordance rate of diagnosis of AC among the three Korean Medicine doctors was moderate. The CHQ scores and 'Simultaneous Occurrence of Cold and Heat Syndromes pattern' scores of the IPIFD also suggest that diagnosis of AC is relevant to cold and heat patterns, and these questionnaires could be utilized as supportive data for the diagnosis of AC. Further studies should be conducted for the purpose of quantifying and standardizing abdominal examinations in Korean Medicine.