• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.9
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• pp.108-116
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• 2009

In this paper, we develop an ELM(Extreme Learning Machine) based short-tenn water demand prediction algorithm which solves overfitting problem of MLP(Multi Layer Perceptron) and has quick training time. To show effectiveness of proposed method, we analyzed time series data collected in A water treatment plant at Chung-Nam province during $2007{\sim}2008$ years and used the selected data for the verification of developed algorithm. According to the experimental results, MLP model showed 5.82[%], but the proposed ELM based model showed 5.61[%] with respect to MAPE, respectively. Also, MLP model needed 7.57s training time, but ELM based model was 0.09s. Therefore, the proposed ELM based short-term water demand prediction model can be used to operate the water treatment plant effectively.

• Journal of the Korean Institute of Intelligent Systems
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• v.19 no.5
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• pp.713-719
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• 2009

In this paper, we develope a water demand forecasting algorithm using AR(Auto-regressive) and MLP(Multi-layer perceptron). To show effectiveness of the proposed method, we analyzed characteristics of time-series data collected in "A" purification plant at Jeon-Buk province during 2007-2008, and then performed the proposed method with various input factors selected through various analyses. As noted in experimental results, the performance of three types model such as multi-regressive, AR(Auto-regressive), and AR+MLP(Auto-regressive + Multi-layer perceptron) show 5.1%, 3.8%, and 3.6% with respect to MAPE(Mean Absolute Percentage Error), respectively. Thus, it is noted that the proposed method can be used to predict short-term water demand for the efficient operation of a water purification plant.

• Journal of Practical Agriculture & Fisheries Research
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• v.7 no.1
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• pp.55-63
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• 2005

Tuber yield and content of general component and diosgenin which is a main bioactive property were investigated in order to determine the growth characteristics of round typed yam(Dungeun-ma, Dioscorea opposita L.) and the potential of artificial culture at Suwon, Korea. Sprouting rates of segmented small tubers such as 3, 5, 7, 9, and 12g were respectively 60.3, 80.5, 85.3, 98.6 and 99.3% when they were investigated 30 days after planting. Segmented small tubers of 3, 5, 7, 9, and 12g enlarged respectively to 66, 87, 98, 120, and 140g in the green-house cultivation. Segmented small tubers of 3, 7, 12, 18, and 23g enlarged respectively to 35.2, 124.7, 142.7, 174.8, and 200,7g in the open-air field cultivation.

• Journal of the Korean earth science society
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• v.34 no.4
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• pp.303-312
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• 2013

Typhoon Sanba was selected for describing the Korea Meteorological Administration (KMA) Global Data Assimilation Prediction System (GDAPS) model bias tendency in forecast for the interaction between mid-latitude trough and movement speed of typhoon. We used the KMA GDAPS analyses and forecasts initiated 00 UTC 15 September 2012 from the historical typhoon record using Typhoon Analysis and Prediction System (TAPS) and Combined Meteorological Information System-3 (COMIS-3). Sea level pressure fields illustrated a development of the low level mid-latitude cyclogenesis in relation to Jet Maximum at 500 hPa. The study found that after Sanba entered the mid-latitude domain, its movement speed was forecast to be accelerated. Typically, Snaba interacted with mid-latitude westerlies at the front of mid-latitude trough. This event occurred when the Sanba was nearing recurvature at 00 and 06 UTC 17 September. The KMA GDAPS sea level pressure forecasts provided the low level mid-latitude cyclone that was weaker than what it actually analyzed in field. As a result, the mid-latitude circulations affecting on Sanba's movement speed was slower than what the KMA GDAPS actually analyzed in field. It was found that these circulations occurred due to the weak mid-tropospheric jet maximum at the 500 hPa. In conclusion, the KMA GDAPS forecast tends to slow a bias of slow movement speed when Sanba interacted with the mid-latitude trough.

• Journal of the Korean earth science society
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• v.28 no.7
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• pp.947-956
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• 2007

In this article, the extratropical transition (ET) of tropical cyclone (TC) was investigated based on the case study covering the latest three TCs (Shanshaa Yaki, and Soulik) associated with ET evolution (onset and completion) using the objective 37 diagnostics of Evans and Hart (2003) and Hart (2003). At 500-hPa level, on an onset of ET, all three TCs entered the baroclinic zone. In a vertical cross-section analysis, three TCs before and at an onset of ET kept warm and humid throughout all levels around the TC center. However, these TCs after ET onset became relatively cold and dry over the western part of TC as the typical characteristics of ET concept model. Although our case study was not sufficient, it is concluded that the diagnostics of the ET onset and atmospheric structure change associated with Evans and Hart (2003) and Hart (2003) will be useful in ET operational forecast.

• Korean Journal of Plant Resources
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• v.20 no.2
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• pp.99-103
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• 2007

Tuber yield and content of general component and diosgenin which is a main bioactive property were investigated in order to determine the growth characteristics of round typed yam (Dungeon-ma, Dioscorea opposita L.) and the potential of artificial culture at Suwon, Korea. Sprouting rates of segmented small tubers such as 3, 5, 7, 9, and 12g were respectively 60.3, 80.5, 85.3, 98.6 and 99.3% when they were investigated 30 days after planting. Segmented small tubers of 3, 5, 7, 9, and 12g enlarged respectively to 66, 87, 98, 120, and 140g in the green-house cultivation. Segmented small tubers of 3, 7, 12, 18, and 23g enlarged respectively to 35.2, 124.7, 142.7, 174.8, and 200,7g in the open-air field cultivation.

• Journal of Korean Medical classics
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• v.18 no.2 s.29
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• pp.70-84
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• 2005

장석순(張錫純)$(1860{\sim}1933)$시청말민초시기적의가(是淸末民初時期的醫家), 통과대기소저(通過對其所著)${\ulcorner}$의학충중참서록(醫學衷中參西錄)${\lrcorner}$적제오기제삼권중(的第五期第三卷中), 관우(關于)'논간병치법'(論肝病治法)내용적연구(內容的硏究), 소득출적결론시(所得出的結論是), 기대간병적치법가개괄위평간법(其對肝病的治法可槪括爲平肝法), 산간법(散肝法), 화간법(化肝法), 유간법(柔肝法), 진간법(鎭肝法), 염간법(斂肝法), 보간법(補肝法), 완간법등팔법(緩肝法等八法). 평간법인위(平肝法認爲), 인지원기찰근우신, 맹아우간이유약역손(萌芽于肝而柔弱易損), 고불가관파간기(故不可關破肝氣). 차내경중(且內經中)'궐음불치(厥陰不治), 구지양명(求之陽明)'여금궤중(與金櫃中)'당선실비(當先實脾)', 도이서조간기위관건(都以舒調肝氣爲關鍵), 인차이승강탕여배비서간탕등립방(因此以昇降湯與培脾舒肝湯等立方), 차작위평간약중시료계지(且作爲平肝藥重視了桂枝). 산간법인위(散肝法認爲), 간위목장(肝爲木臟), 구유직향이성향상신전(具有直向而性向上伸展), 소이부응기성(所以符應其性), 이용신미산지(而用辛味散之), 즉가위보법(卽可爲補法). 작위산간약(作爲散肝藥), 기선용인진여맥아(其善用茵蔯與麥芽). 화간법시재간체증대(化肝法是在肝體增大), 혹간중유열(或肝中有熱), 혹간기울체(或肝氣鬱滯), 혹옹창시(或壅脹時), 작위산간달울지법(作爲散肝達鬱之法), 사용료시호(使用了柴胡), 유향(乳香), 몰약(沒藥), 차이활혈약당좌약사용적치법(且以活血藥當佐藥使用的治法), 우기중시료삼칠근(尤其重視了三七根). 유간법시근거(柔肝法是根據)'간악조희윤(肝惡燥喜潤), 조칙간체판경이간화간기즉망동(燥則肝體板硬而肝火肝氣卽妄動), 윤칙간체유화이간화간기장영정(潤則肝體柔和而肝火肝氣長寧靜)'적이론(的理論), 인위재치료중가선용당귀(認爲在治療中可選用當歸), 작약(芍藥), 백자인(柏子仁), 현삼(玄蔘), 구기자(枸杞子), 아교(阿膠), 별갑(鱉甲), 단불가장기사용(但不可長期使用). 기진간법시(其鎭肝法是), 재치료경간(在治療驚癎), 전광(癲狂), 현운(眩暈), 뇌충혈제증시(腦充血諸證時), 작위대표처방선용료진간식풍탕(作爲代表處方選用了鎭肝熄風湯). 염간법시근거기(斂肝法是根據其)'범인원기지탈(凡人元氣之脫), 개탈재간(皆脫在肝)'적독특이론(的獨特理論), 이내복탕등작위대표처방진행치료적방법(以來復湯等作爲代表處方進行治療的方法), 차대제양사용료산수유(且大劑量使用了山茱萸). 보간법시재간기허약이실기조달시사용적치법(補肝法是在肝氣虛弱而失其條達時使用的治法), 인위황기시보간적주약. 완간법시의거(緩肝法是依據)‘간고급(肝苦急), 급식감이완지(急食甘以,緩之)'지설이정적치법(之說而定的治法), 인위단미감초시대표약(認爲單味甘草是代表藥).

• Parasites, Hosts and Diseases
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• v.30 no.1
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• pp.15-20
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• 1992

The Taenia species in East Asia, hitherto identified as Taenia saginata, has been recognized as differing from the classical descriptions of life cycles and was recently named Taenia saginata taiwanensis (tentatively until 1992) . Major differences between T. saginata and the newly recognized Asian T. saginata are their intermediate hosts and the infected tissues. Asian T. saginata metacestodes are found in the livers of pigs rather than in the muscles of cattle. In this study, we observed the natural infection status of Asian T saginata metacestodes in the livers of 25,358 pigs at an abattoir in Cheongju City, Korea, from 1989 to 1990. Total 256 livers(1.01%) were infected with 1∼96 (mean 2.5 per capita) metacestodes. Most of the metacestodes, however, were either calcified (87.1%) or highly degenerated (12.9%). Living metacestodes were found in only 0.01% (3/25,358) of the examined livers. And these were distributed randomly in each lobe of the livers. The liver of pigs in Korea was con- firmed as an organ hosting the Asian T. saginata metacestode. But its epidemiological significance as a source of human infections should be properly evaluated because of the rarity of the living metacestodes.

• Korean Journal of Optics and Photonics
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• v.16 no.3
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• pp.196-200
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• 2005

A 40 channel arrayed-waveguide grating (AWG) filter operating in C-band and L-band wavelength regions has been fabricated using PLC (Planar Lightwave Circuit) processes with 0.75 refractive index difference. Its design was optimized for matching the center wavelength with the ITU-recommended wavelength. The characteristics of the fabricated C-band AWG are as follows; average insertion loss < 2.5 dB, polarization-dependent loss < 0.3 dB, non-adjacent crosstalk >35dB, and the loss uniformity of 0.8 dB. In the L-band AWG, wavelength accuracy is below 0.02nm.

• Bulletin of the Korean Space Science Society
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• 2009.10a
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• pp.26.3-27
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• 2009

한 기의 영상레이더 위성을 이용하여 동일한 촬영지역에 대해 적절한 기선벡터(Baseline)을 유지하는 두 장(scene)의 영상을 획득하여 그 지역의 정밀 표고차를 추출하는 레이더 간섭계(Interferometry) 임무를 수행하기 위해서는 반복지상궤적을 유지하도록 위성의 궤도를 주기적으로 조정해 주어야 한다. 이 연구에서는 반복지상궤적 유지 정밀도를 극대화시키기 위하여 최적의 기준궤도를 생성하고 이를 유지하기 위한 속도증분 및 궤도 조정 일정을 산출할 수 있는 궤도최적화 S/W 를 개발하였다. 이 연구의 최적 궤도 설계 문제는 다음과 같다. "시작시간 $T_0$에서 초기 접촉궤도 상태벡터 (ECEF 위치 및 속도벡터) $x_0$이고, 지상궤적반복주기 p 이후의 시간 $T_0+p$에서도 초기 접촉궤도 상태벡터와 동일한$x_0$가 되도록 궤도를 유지하려고 할 때, 여명 궤도(dawn-dusk and sun-synchronous orbit)에서 운영되는 위성의 연료소모(또는 속도증분)를 최소화시키는 가상의 궤도조정(maneuver) 횟수, 시기, 크기를 찾아라." 이 연구에서는 궤도최적화 문제를 풀기 위하여 GRACE 중력모델(GGM02C)이 적용된 수치적 방법의 위성궤도예측 알고리즘을 시스템 설계에 적용하였고, 매개변수 최적화 방법 중 구속조건이 있는 비선형 최적화 기법의 하나인 연속 2차 계획법(sequential quadratic programming)을 사용하여 해를 구하였다. 개발된 궤도최적화 S/W의 성능을 분석하기 위하여 고도 550km의 여명궤도를 돌며 지상궤적반복주기가 28일인 영상레이더 위성에 대해 적용하였다. 해석 결과를 통해, 비록 시스템의 비선형이 큼에도 불구하고 최소의 속도증분으로 정밀한 반복지상궤적이 유지됨을 알 수 있었다.