• Journal of Korea Water Resources Association
• /
• v.53 no.2
• /
• pp.97-105
• /
• 2020

Recently, Artificial Neural Network receives attention as a data prediction method. Among these, a Long Shot-term Memory (LSTM) model specialized for time-series data prediction was utilized as a prediction method of hydrological time series data. In this study, the LSTM model was constructed utilizing deep running open source library TensorFlow which provided by Google, to predict inflows of multipurpose dams. We predicted the inflow of the Yongdam Multipurpose Dam which is located in the upper stream of the Geumgang. The hourly flow data of Yongdam Dam from 2006 to 2018 provided by WAMIS was used as the analysis data. Predictive analysis was performed under various of variable condition in order to compare and analyze the prediction accuracy according to four learning parameters of the LSTM model. Root mean square error (RMSE), Mean absolute error (MAE) and Volume error (VE) were calculated and evaluated its accuracy through comparing the predicted and observed inflows. We found that all the models had lower accuracy at high inflow rate and hourly precipitation data (2006~2018) of Yongdam Dam utilized as additional input variables to solve this problem. When the data of rainfall and inflow were utilized together, it was found that the accuracy of the prediction for the high flow rate is improved.

• Journal of Korean Society of Forest Science
• /
• v.61 no.1
• /
• pp.69-79
• /
• 1983

To develope the fundamental models suitable for slope stabilization and scenic effect improvement of the roadside slopes, this study has continuously been conducted for last about 10 years through the field survey and observations on the roadside slopes of 100 plots located in the Capital region. The results obtained could be summarized as follows: 1) In general, due to unsuitable treatments and constructions to the man-made bare slope characteristics of the roadsides, the treatment aims for stabilizing and improving the scenic beauty of the slopes have not been successfully reached in the surveyed regions. 2) Particularly, because of insufficiency of the follow-up maintenance techniques to the roadside slopes treated, denudations of slope scenery established as well as the withering of the vegetation planted have been accelerated for the most part of the slopes treated. 3) 6 fundamental models for the roadside slope treatments have been developed and could be edaptable to the nation-wide purposes. The fundamental models are the model of forest scenery match plantation, roadside scenery establishment, denuded land rehabilitation, rock slope greenification, absolute stabilization, and environmental plantation belt establishment, respectively.

• The korean journal of orthodontics
• /
• v.28 no.2 s.67
• /
• pp.175-187
• /
• 1998

The purpose of this study was to predict the prognosis of class III malocclusion treatments. 25 patients selected for this study were devided into two groups by the stability of dentitional, skeletal and soft tissue profile improvement. One was stable group which consisted of 12 children and the other was relapse group with 13 children. Various measurements in initial lateral cephalogram were calculated and analyzed by t-test, correlation coefficient and discriminant analysis. The results of this study were summarized as follows 1. In both stable and relapse groups, there was not distinct difference in the antero-posterior skeletal relationship (P<0.05). 2. As the result of wits, hn to occlusal plane angle and occlusal plane to mandubular plane angle, the occlusal plane of relapse group was stepper than that of the stable group. 3. In correlation coefficient analysis, the overjet and the occlusal plane to mandibular plane angle showed significant correlations (p<0.001, p<0.01). 4. The discriminant function was obtained from three major influential measurements; overjet, AB to occlusal plane angle and articular angle, and this function could discriminate correctly in 88% of these samples.

• 전기의세계
• /
• v.24 no.4
• /
• pp.3-5
• /
• 1975

우리 인간은 그들이 개발한 과학과 기술에 의하여 자연 중에 존재하는 많은 자원을 그들의 생활에 도움이 되는 물체로 바꾸어 왔고 각종 에너지를 그들이 필요로 하는 형태로 바꾸었으며 또 그들이 사는 환경을 더욱 안락하도록 개조하여 왔다. 인간에 계속해서 현재와 같이 생활상태를 향상시키며 번영을 시도한다면 과학기술개발은 영원히 계속될 것이다. 이 과학기술개발에 관한 노력은 과거에는 가치관의 차이로 국가간의 노력의 차이가 있었으나 현재는 선후진국을 막론하고 과학기술에 의한 공업진흥이 국가사회의 경제개발의 원동력이며 그 생활향상의 열쇠가 된다는 것을 다 깨닫고 있다. 이와 같은 과학기술과 인간생활과의 숙명적인 관계중에서도 전기학술과 인간관계는 타과학과의 관계보다 훨씬 깊은 바가 있다. 우리는 호수에 물의 위치 에너지, 석탄이 가지고 있는 열에너지, 바람이 가지고 있는 운동에너지 등을 비롯하여 최근에 발견된 원자에너지까지도 이를 전기에너지로 변환시켜서 이용하고 있다. 장래 어떠한 에너지가 새로 개발되더라도 전기에너지로 변환되어 현재와 같이 우리 생활에 기여할 것은 틀림없다. 이는 전기에너지의 사용편리성으로 볼 때 이의를 제기할 사람은 없을 것이다. 따라서 각종에너지를 전기에너지로 바꾸는 발전기술과 이 장치의 제조공업, 이를 수요지까지 수송하는 송변전기술과 이 장치의 제조공업, 공장에서 사용되는 전기기기들의 운전사용기술과 가정에서 소요되는 전기기기의 제조공업 이상 전기공업의 여러 방치에 소요되는 원자재의 제조공업 등 소위 전기기술은 인간생활과 절대 불가분의 기술이며 앞으로도 인류의 존재와 더불어 영원한 발전을 계속할 것이다. 전기기술발전없이 인간사회와 국가의 산업발전을 기대한다는 것은 어리석은 일이라 아니할 수 없다. 가까운 장래 우리나라 계통이 당면하여야 할 계통제어에 관한 몇가지 문제를 고찰하고저 한다. 단 개개의 문제에 관한 구체적인 해석 또는 검토에 관하여는 다음 기회에 미루기로하고, 우선 여기서는 당면문제로서 대처하지 않으면 안될 자동주파수제어문제및 계통의 경제운용문제만에 한정하여, 이것을 우리나라의 현상과 관련시켜 개설하고, 이들의 자동화에 관한 기본적인 문제를 간단히 적어 보겠다. 가능하다. 제작완료된 ASIC은 기능시험을 완료했으며 실제 line-of-sight(LOS) 시스템 구현에 적용중이다. 시대를 살아 갈 회원들이다. '컨텐츠의 시대'가 개막되는 것이며, 신세기통신과 SK텔레콤은 선의의 경쟁 과 협력을 통해 이동인터넷 서비스의 컨텐츠를 개발해 나가게 될 것이다. 3배가 높았다. 효소 활성에 필수적인 물의 양에 따른 DIAION WA30의 라세미화 효율에 관하여 실험한 결과, 물의 양이 증가할수록 그 효율은 감소하였다. DIAION WA30을 라세미화 촉매로 사용하여 아이소옥탄 내에서 라세믹 나프록센 2,2,2-트리플로로에틸 씨오에스터의 효소적 DKR 반응을 수행해 보았다. 그 결과 DIAION WA30을 사용하지 않은 경우에 비해 반응 전환율과 생성물의 광학 순도는 급격히 향상되었다. 전통적 광학분할 반응의 최대 50%라는 전환율의 제한이 본 연구에서 찾은 DIAION WA30을 첨가함으로써 성공적으로 극복되었다. 또한 고체 염기촉매인 DIAION WA30의 사용은 라세미화 촉매의 회수 및 재사용이 가능하게 해준다.해준다.다. TN5 세포주를 0.2 L 규모 (1 L spinner flask)oJl에서 세포간의 응집현상 없이 부유배양에 적응,배양시킨 후 세포성장 시기에 따른 발현을 조사한 결과 1 MOI의

• Tuberculosis and Respiratory Diseases
• /
• v.41 no.5
• /
• pp.489-493
• /
• 1994

Background: Nicotinamide adenine dinucleotide glycohydrolase(NADase) is located on the surface of the cells. It is bound by glycosylphosphatidylinositol(GPI)-linkage, which can be cleaved by bacterial PI-specific phospholipase C(PI-PLC). Recently, it was studied that NADase was increased in infected tuberculosis animal, but absolute NADase is uncertainly increased because of high NADase in Mycobacterium tuberculosis. Therefore, we studied pure NADase activity in red blood cells of normal person and patients of tuberculosis. Method: We evaluated the 19 healthy adults and 16 tuberculosis infected patients, and then, the latter cases were evaluated after 3 months antituberculosis therapy. NADase activity was calculated by scintillated counting of cleaved radioactive [carbonyl-$^3H$] nicotinamide Result: NADase activity was $2021.1{\pm}824.0\;pmol/min/10^6$ erythrocytes in healthy adults vs. $3339.0{\pm}1568.0$ in tuberculosis infected patients, and was $3339.0{\pm}1568.0$ in pretreated patients vs. $2238.6{\pm}1013.1$ in same 3 months treated patients. Conclusion: NADase activity of erythrocytes is elevated in tuberculosis infection, and normalized afer antituberculosis therapy. Therefore, we suggested NADase activity as the new diagnostic and therapeutic indicator.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.17 no.3
• /
• pp.129-136
• /
• 2017

Geographic Information System The geographic information system (GIS) has been limited to the government and some public sectors. Recently, the market has been diversified by combining with other areas such as mobile and CRM (Customer Relationship Management). The development direction of GIS technology in the 21st century is Web GIS, 3D GIS, mobile GIS, LBS, etc. as general technology for GIS application system development and spatial information service. In this study, we developed a new concept marking nail (a marking nail with built - in intelligent storage memory device) from the function of simple positioning of a marking nail related to a previously used underground item,, Burial depth, pipe thickness, piping material, management agency, contractor, contact, etc.) and store it in DB server, if necessary.Make it available in the right place. Through this research, it is possible to prevent and minimize various accidents caused by irregular excavation works, etc., and to provide information for establishing countermeasures related to sink holes. In order to provide systematic and reliable information on underground burial management, it was proposed to input information conveniently in the field, and the purpose was to reduce the incidence of buried underground pipes absolutely.

• Korean Journal of Ecology and Environment
• /
• v.33 no.4 s.92
• /
• pp.387-394
• /
• 2000

Water pollution characteristics were investigated in the Kyongan stream and major inlet parts of Paltang Reservoir from April to July, 2000. Water quality in the Kyongan stream was extremly deteriorated by treated wastewater discharge at near sewage wastewater treatment plant (SWTP) located in the upstream, and it is likely to influence eutrophication of the lower part of the stream. Water quality of the Kyongan stream showed a typical hypertrophic condition. Influxed concentrations with $NH_4$ and SRP into the main stream from SWTP were declined precipitously as water flowed toward the lower part of the stream, and chlorophyll- a explosively increased in the midstream. Average concentrations of $NH_4$, SRP and chlorophyll-a in the main stream were $1,343\;{\mu}g\;N/l$, $1,779\;{\mu}g\;P/l$ and $188\;{\mu}g\;l$, respectively. Particularly, phosphorus load was very high, and its influence on the algal growth stimulation was remarkable. In comparison with the water quality inflowing into Paltang Resevoir, pollution status of the Kyongan stream was more worse than that in the Pukhan River and the Namhan River. The results of this study indicate that the management of point source, SWTP effluent, is urgent to mitigate eutrophication of Paltang Reservoir, and requires further necessary controls of inorganic phosphorus loading.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
• /
• v.4 no.3
• /
• pp.170-179
• /
• 1999

The SUS (Signal, Underwater Sound)-OAT experiment was carried out in the Ulleung Basin of the East Sea on 3 June 1997. The SUS-OAT system consisted of aircraft deployed shots as sources and a vertical line array (VLA) tethered by a receiver ship was used to survey a large area where a mesoscale warm eddy appears frequently. The experiment was carried out such that explosive charges set to detonate at 800 ft depth were dropped in a rectangular ($120{\times}120$ km). Sources were a rapidly deployable SUS charge (MK 61 MOD 0), and receiver is a fixed VLA, 90 m in length (150-240 m in receiver depth), composed of 10 elements equally spaced. The reference ray paths are computed by range-dependent acoustic model in canonical ocean based on the historical data. The singular value decomposition (SVD) method is used to obtain the horizontal perturbation of the temperature fields. Horizontal distributions of temperature fields at 150 m and 200 m depth show a weak warm eddy observed by AXBT and the inversely estimated temperature shows similar patterns in terms of the location of the warm eddy. In conclusion, the SUS-OAT experiment has been successful to estimate the position of warm eddy and its temperature field in the East Sea of Korea.

• Journal of Hospice and Palliative Care
• /
• v.16 no.2
• /
• pp.65-73
• /
• 2013

The objective of this paper is to suggest future goals and strategies for social work in hospice and palliative care in Korea by understanding its historical background. Both literature review and participant observation were performed to examine historical data relating to social work in hospice and palliative care in Korea. Also reviewed were the current trends with a focus on the roles of social workers in the said arena, qualifications, education, research and medical insurance policy. First of all, the roles of social workers do not appear to be clearly defined in the field of hospice and palliative care, which seems to lead to the lack of recognition as professional workers. The qualification standard for social workers in hospice and palliative care remains inadequate. Second, there seems to be insufficient professional social worker training resources, in terms of both the number of educators and training programs. Third, social workers in Korea produce significantly less publications than those in other professions. There is also a dearth of qualified evidence-based research that is needed to prove benefits of intervention and ultimately for policy implications. Last, the current medical insurance policy needs to be revised to secure fees for social work services and dedicated full-time social workers in hospice and palliative care. Korea needs to approach social work in hospice and palliative care with specific goals to develop future strategies. Related infrastructure and an executive structure should be established via networking and partnership with academic societies, associations and schools.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.36 no.4
• /
• pp.329-336
• /
• 2000

Welding is a important technological method in mechanical engineering. $CO_2$MAG(metal active gas) welding means that metal part in double capstan drum for the inshore and costal vessels are joined by melting(with or without a filler material) or that new material is added to a metal part by melting. The thermal stresses appear due to a non-uniform temperature field, inhomogeneous material properties, external restraint and volume changes during phase transformations. In this study analysis the elasto-plastic thermal stresses distribution of welding part in double capstan drum for the inshore and costal vessels using finite element method (FBM). Therefore it calculates the numerical value that can be applied to the optimum design of welding parts and the shapes. The significant results obtained in this study are summarized as fellows. At early stage of the cooling after welding process, the abrupt thermal stresses gradient has been shown in the vicinity of welding part. In the thermal stresses analysis due to temperature gradient and heat shocking maximum stress was occurred of welding part and stresses were distributed from 54MPa~48MPa.