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Bayasgalan, Gerelchuluun,Ahn, Joong‐,Bae John Wiley Sons, Ltd 2018 International journal of climatology Vol.38 No.14
<P>The hindcast data of Pusan National University coupled general circulation model (PNU CGCM), a participant model of the Asia‐Pacific Economic Cooperation Climate Center (APCC) Multi‐Model Ensemble Climate Prediction System, and August–October sea‐surface temperature (SST) in the northern Barents–Kara Sea (BKI) and the sea‐ice extent (SIE) in the Chukchi Sea (East Siberian Sea index [ESI]) are used for predicting 20 × 20‐km‐resolution anomalous surface air temperature at 2‐m height (aT2m) over Mongolia for boreal winter. For this purpose, area‐averaged surface air temperature (TI) and sea‐level pressure (SLP) over Mongolia are defined. Then four large‐scale indices, TI<SUB>mdl</SUB> and SHI<SUB>mdl</SUB> obtained from PNU CGCM, and TI<SUB>MLR</SUB> and SHI<SUB>MLR</SUB> obtained from multiple linear regressions on BKI and ESI, are incorporated using the artificial neural network (ANN) method for the prediction and statistical downscaling to obtain the monthly and seasonal 20 × 20‐km‐resolution aT2m over Mongolia in winter. An additional statistical method, which uses BKI and ESI as predictors of TI and SHI together with dynamic prediction by the CGCM, is used because of the relatively low skill of seasonal predictions by most of the state‐of‐the‐art models and the multi‐model ensemble systems over high‐latitude landlocked Eurasian regions such as Mongolia. The results show that the predictabilities of monthly and seasonal 20 × 20‐km‐resolution aT2m over Mongolia in winter are improved by applying ANN to both statistical and dynamical predictions compared to utilizing only dynamic prediction. The predictability gained by the proposed method is also demonstrated by the probabilistic forecast implying that the method forecasts aT2m over Mongolia in winter reasonably well.</P>
Bayasgalan Purevdorj,Uranchimeg Dugarsuren,Bulgan Tuvaan,Baasankhuu Jamiyanjav 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.4
To study the affect of anatomical variance of lacrimal sac fossa on dacryocystorhinostomies (DCR) performed by the traditional external (EX-DCR) approach or an endoscopic (EN-DCR) endonasal approach. A total of 292 consecutive cases with primary nasolacrimal obstruction underwent DCR surgery. Orbital computed tomography scan was used to measure lacrimal sac fossa and other related structures and Lac-Q questionnaire was used to compare surgery result. Maxillary portion of lacrimal sac fossa is thicker in failed surgery group than successful surgery group (P<0.05). Lateral nasal structures (uncinate process, operculum of the middle turbinate, agger nasi) are dominantly adjusting to lacrimal sac fossa in failed surgery group (P<0.05). Patients who underwent EX-DCR has a 6.0-point and EN-DCR group 11.0-point improvement (P<0.016) in Lac-Q questionnaire. Patients who have a thick frontal process of the maxilla and uncinate process, operculum of the middle turbinate, ethmoid cells adjusting to lacrimal fossa are prone to have recurrence of nasolacrimal duct obstruction after DCR surgery. The EN-DCR and the EX-DCR approach have an equivalent surgical success rate but improvement in quality of life by using the Lac-Q questionnaire is greater in the endoscopic group when compared with the external.
A Study on Variable Speed Generation System with Energy Saving Function
Bayasgalan. D,Sang-Ho Lee,Dong-Hwa Han,Young-Jin Lee,Gyu-Ha Choe 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.1
This paper presents development of variable speed generation (VSG) system with energy saving function. The rubber tyred gantry crane (RTGC) requires the power from diesel-engine. Significant fuel savings by reducing the engine speed can be achieved, because all of operation modes except hoisting are required lower power than rated value of engine. When low speed operation output voltage of generator is decrease until acceptable range of motor driver inverters and auxiliary load supplier. According to power demand engine speed is varying from 20 to 60Hz, and voltage is varying between 210Vac and 480Vac. When idle mode or low power operation dc/dc converter operates by constant output voltage control and inverters dc site voltage is compensated by it. This paper proposed 3-phase interleaved boost converter which has the same structure as the commercially available 3-phase inverter and current sharing capability. 400kW interleaved converter is designed and a performance of converter is evaluated through several experiments with a RTGC system. Energy saving VSG system can cut down fuel consumption by 36% and 21.3% at idle and unidirectional load operations.
Moral Education of Japan and Korea:The Suggestion for Developing Education System in Mongolia
Bayasgalan Oyuntsetseg 한국일본교육학회 2012 한국일본교육학연구 Vol.16 No.2
Moral education in Mongolia is integrated into subject matters and the moral education can be derived from all educational activities. Nevertheless, there is not any regulation on the contents and guide for each grade levels. But Korea and Japan have a clear purpose, contents and methods of moral education. Hence, it is compared with the tree countries' education systems above all the standard of education in Mongolia, the course of study in Japan and the national common basic curriculum in Korea. In terms of formal, the moral education in Korea is characterized to have subject matter and evaluation system. The moral education in Japan accomplished through extracurricular activities and there is no evaluation system. Especially, in Japan, the moral lessons are carried through the whole school activities and it has a course of study in morals. That is a big difference between these countries.