An ARP-disabled network system for neutralizing ARP-based attack

( Davaadorj Battulga ),( Rhong-ho Jang ),( Dae-hun Nyang ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2

Address Resolution Protocol (ARP) is used for mapping a network address to physical address in many network technologies. However, since ARP protocol has no security feature, it always abused by attackers for performing ARP-based attacks. Researchers presented many technologies to improve ARP protocol, but most of them require a high implementation cost or scarify the network performance for using ARP protocol securely. In this paper, we present an ARP-disabled network system to neutralize the ARP-based attacks. “ARP-disabled” means suppress the ARP messages like request, response and broadcast messages, but not the ARP table. In our system, ARP tables are used for managing static ARP entries without prior knowledge (e.g. IP, MAC list of client devices). This is possible because the MAC address was designed to be derived from IP address. In general, our system is safe from the ARP-based attacks even the attacker has a strong power. Moreover, we saved network bandwidth by disabling the ARP messages.

“Dutch Disease” and Mongolian Economy

DAVAADORJ Tsedevsuren 한국로고스경영학회 2005 한국로고스경영학회 학술발표대회논문집 Vol.- No.-

Endemic and sub-endemic water beetles of Mongolia and their distribution ranges

Davaadorj Enkhnasan,Bazartseren Boldgiv 국립생물자원관 2019 Journal of species research Vol.8 No.4

The aim of this study was to compile a species list of endemic water beetles of Mongolia and determine their distribution patterns. A total of 1,179 individuals of endemic water beetles were collected from nine different sub-basins (123 sample points) throughout the country. Currently, 21 endemic and sub-endemic species have been recorded in Mongolia. Eight of these species were strictly endemic. The endemic and sub-endemic species were found only among four families: Dytiscidae (10 out 99 spp.), Gyrinidae (1 out 7 spp.), Helophoridae (5 out 16 spp.), and Hydraenidae (5 out 13 spp.). The rate of endemism was higher in Hydraenidae than other families (38.4%). Endemic beetle fauna was most similar between the Onon and Kherlen River Basins (80%). Helophorus parajacutus Angus, 1970 was common in five sub-basins, but Agabus kaszabi Guéorguiev, 1972, Gyrinus sugunurensis Nilsson, 2001 and Ochthebius mongolicus Janssens, 1967 were recorded from only one sub-basin. In terms of sub-endemic species, Mongolia was mostly similar to the fauna of Eastern Siberia, Russia (73.7%) than other neighboring regions. Due to Mongolia’s vast territory and different natural zones, endemism was exceptionally low (12.4%), but these data provide baseline information of endemic and rare species for their further conservation.

Some issues of Legal regulation on protections of untouched natural resources

( Davaadorj Dorjtumen ),( Suvd Manibadar ) 제주대학교 법과정책연구소 2015 국제법무 Vol.7 No.2

몽골은 고유한 천연 자원을 보호하기 위하여 국가 정책을 개발하고, 또한 특별 보호 지역의 새로운 기준을 설정하고 법 규정과 몽골의 손길이 닿지 않 은 천연 자원을 보호하기 위해 협력을 강화하는 것이 시급하다. 따라서, 본래 의 천연 자원의 훼손이 없도록 법적으로 규제를 할 필요가 있다. 몽골은 수많은 독특한 지역과 자연에 의해 생성 된 자연 경관을 가지고 있 다. 따라서 몽골의 현세대는 다음 세대에 손길이 앓지 않는 교유의 자연환경 을 상속하기 위해 많은 전통적인 방법과 국가 정책을 개발해야 한다. It is urgent for Mongolia to have and develop a state policy to protect umque natural resources of Mongolia and to set a new classification of special protected areas in Mongolia and to enhance legal regulations and coordination to protect untouched natural resources of Mongolia; therefore, it is necessary to have a legal regulation that handles a protection of untouched natural resources on basis of the tendencies to consider other relations correlating with the loss of untouched natural resources. Mongolia has many unique areas and natural sightseeing that are created by nature; therefore, Mongolian ancestors had many traditional methods and state policies to inherit the unique untouched nature and environment to the next generation.

The Soiling Classification of Solar Panel using Deep Learning

Ulziitamir Davaadorj,Kwan-Hee Yoo,Sang Hyun Choi,Aziz Nasridinov 한국콘텐츠학회 2021 한국콘텐츠학회 ICCC 논문집 Vol.2021 No.12

Endemic and sub-endemic water beetles of Mongolia and their distribution ranges

Enkhnasan, Davaadorj,Boldgiv, Bazartseren The National Institute of Biological Resources 2019 Journal of species research Vol.8 No.4

The aim of this study was to compile a species list of endemic water beetles of Mongolia and determine their distribution patterns. A total of 1,179 individuals of endemic water beetles were collected from nine different sub-basins (123 sample points) throughout the country. Currently, 21 endemic and sub-endemic species have been recorded in Mongolia. Eight of these species were strictly endemic. The endemic and sub-endemic species were found only among four families: Dytiscidae (10 out 99 spp.), Gyrinidae (1 out 7 spp.), Helophoridae (5 out 16 spp.), and Hydraenidae (5 out 13 spp.). The rate of endemism was higher in Hydraenidae than other families (38.4%). Endemic beetle fauna was most similar between the Onon and Kherlen River Basins (80%). Helophorus parajacutus Angus, 1970 was common in five sub-basins, but Agabus kaszabi $Gu{\acute{e}}orguiev$, 1972, Gyrinus sugunurensis Nilsson, 2001 and Ochthebius mongolicus Janssens, 1967 were recorded from only one sub-basin. In terms of sub-endemic species, Mongolia was mostly similar to the fauna of Eastern Siberia, Russia (73.7%) than other neighboring regions. Due to Mongolia's vast territory and different natural zones, endemism was exceptionally low (12.4%), but these data provide baseline information of endemic and rare species for their further conservation.

Recovery of Clean Coal for the use of Synthetic Fuels from Anthracite by Froth Flotation

Tsogchuluun Davaadorj,백상호,김병곤,전호석 한국자원공학회 2018 한국자원공학회지 Vol.55 No.4

Coal generally contains numerous types of gangue minerals that produce different physical properties in the product. The aim of this study is to eliminate the impurities in coal by froth flotation to make it more suitable for use in synthetic fuels. In order to ensure optimum flotation conditions, the operational and physicochemical parameters of flotation need to be varied. According to the results, collector dosage and particle sizehad the most significant effect on the outcome. The results also suggest that the optimum conditions for the recovery of good quality clean coal are a particle size below 65 mesh (210 µm), using 1500 g/t kerosene as a collector; 1000 g/t sodium silicate asa depressant; and 100 g/t AF-65 as a frother. At this conditions, it is confirmed that clean coal can be recovered with a combustible recovery of over 85% and ash contentbelow 12% by flotation.

모바일 콘텐츠 사용자 만족도에 영향을 미치는 요인에 관한 비교 연구

다와더르지냠수릉(Nyamsuren Davaadorj),이동철(Dong-cheol Lee),김근형(Keun-hyung Kim) 한국인터넷전자상거래학회 2009 인터넷전자상거래연구 Vol.9 No.3

The use of mobile gadgets has been rising day by day. The mobile web is one of the most exciting zones for the industry as well as research and development. This thesis shows a study on the mobile contents which refers to access wireless internet using mobile devices such as cell phones, personal digital assistants (PDAs), and other mobile gadgets to use in the public network. The research interest of the thesis is to analyse the users' satisfaction of mobile contents in Korea and Mongolia. The system quality, information quality, and the cost to access which contain total six different independent variables are affecting on users' satisfaction of mobile contents. The users' satisfaction of mobile contents increases the frequency to use mobile contents. The ease of use, security, timeliness, relevance, entertainment quality, and the cost to access are the six independent variables which are used to analyse users' satisfaction of mobile contents in Korea and Mongolia. These independent variables are extracted from literature survey. The ease of use and security represent system quality as well as the timeliness, relevance, and entertainment quality come in domain of information quality. The questionnaire surveys were collected from mobile contents users in Korea and Mongolia. The statistical analysis has been done using SPSSWIN 12.0 software and the results of analysis are described as below- Ⅰ. The hypotheses for ease of use and timeliness are valid for users in Korea. Ⅱ. The hypotheses for security and relevance are valid for users in Mongolia. Ⅲ. The hypotheses for entertainment quality and cost are valid for users in Korea and Mongolia. Ⅳ. The users’ satisfaction decides the frequency to use mobile contents in both countries.

Settling velocity of irregularly shaped particles in Newtonian fluids

Bat-Erdene Davaadorj,이재령,김영진 한국자원공학회 2013 Geosystem engineering Vol.16 No.3

This work explores the expression of irregularly shaped particles in Newtonian fluids. Ta2O5 and Nb2O5 particles, with sizes ranging from 42 to 141 mm, were settled in Newtonian fluids placed in cylindrical tubes of different inner diameters (20–50 mm). The formula proposes an explicit relationship between the cylindrical tube diameter and settling velocity of irregularly shaped particles in Newtonian fluids.

Enhanced Resistance to Bacterial Blight Diseases in Transgenic Rice Plants Overexpressing Antimicrobial Peptides

In Hye Lee,Yu Jin Jung,Munkhtsetseg Davaadorj,Uuganchimeg Bayarsaikhan,Yong-Gu Cho,Kwon Kyoo Kang 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07

The antimicrobial peptide possesses defence system to virus, fungi and bacteria. To study antibiotic in plant, antimicrobial peptides were obtained by PCR analysis by primers designed from antimicrobial peptides (Gene bank accession no. NM-004345), cloned in pET28 expression vector and the vector transformed into E. coli. And this gene was inserted into Ti-plasmid VB2 vector, which contained the pGD1 promoter. The expression construction was transformed into Agrobacterium EHA105 and then plant tissues of rice (Oryza sativa). Seeds from transgenic plants (T0) were germinated on selective media containing spectinomycin 50 mg/L. Selected plants and wild type were analyzed by PCR and RT-PCR with pGD1 promoter region and transgene specific primer set. All transgenic plants showed expression pattern of similar levels. We showed that the chromobody is effective in binding GFPand antimicrobial peptide gene in tobacco leaf. Most interestingly, this can be applied to interfere with the function of GFP fusion protein and to mislocalize (trap) GFP fusions to the plant cytoplasm in order to alter the phenotype mediated by the targeted proteins. Bacterial blight disease was enhanced resistance in transgenic lines. These results showed that antibiotic peptides might show a broad-spectrum antimicrobial activity.