A Study of Efficient Connection using Mobility Property in Mobile Ad-hoc Network

Youngj-jun Oh1,Kang-whan Lee 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.12

In this paper, we proposed the context-awareness routing algorithm DDV (Dynamic Direction Vector)-hop algorithm at Mobile Ad-hoc Networks. Existing algorithm in MANET, it has a vulnerability that the dynamic network topology and the absence of network expandability of mobility of nodes. This proposed algorithm forms cluster formation using a range of direction and threshold of velocity by base-station, and we calculate exchange cluster head node probability using direction and velocity for maintaining cluster formation. DDV algorithm forms a cluster based on the cluster head node. As a result of simulation, our scheme could maintain the proper number of cluster and cluster members regardless of topology changes. In response to maintain cluster formation, we prove a continuous connection between nodes.

DNA 포렌식에 의한 DNA 증거의 증거능력에 관한 고찰

김동준(Kim, Dong­Jun),오경식(Oh, Kyung­Sik) 한국피해자학회 2018 被害者學硏究 Vol.26 No.1

Advances in forensic DNA analysis have led to tremendous improvements in identifying and confirming perpetrators and victims. This has added credibility to DNA evidence, resulting in cases where criminals are more likely to be forced to own up to their criminality and culpability. This paper addresses scientific and technical theories the DNA analytical technologies are founded on as well as the suitability of individual analytical procedures. Beyond these issues, it went on to discuss the requirements that need to be met in order for DNA evidence, collected through forensic DNA testing, to be admissible in court in Korea. DNA testing results are presented in court in the form of certified expert testimony. And according to Article 313, “Statement, etc.” of the Criminal Procedure Act, as long as the DNA evidence offered is free from errors in laboratory procedures and concluding interpretations of the person responsible for producing the expert opinion recording, such procedures and outcomes will be admissible as legitimate evidence in court. In other words, the aforementioned expert testimony is nothing short of legislative intent at acknowledging the testimony as admissible in court, thus should not be understood as standards with which the scientific evidence concerned is admissible and tried at court. For this reason, admissibility in court of DNA evidence from DNA forensic analysis should not only be based on whether it meets the requirements as expert testimony, but also whether its theories of reasoning and analyses are founded on acceptable scientific principles. Furthermore, the tools and methods used in DNAprofiling need to be validated, allowing the analyzed result in question to be assessed for admissibility in criminal court. Trends of precedents regarding DNA evidence seem to require that the relevancy of DNA analytical theories, suitability of DNA analytical methods that have implemented these theories, and maintenance of the chain of custody of evidence by applying scientific procedures to the targets concerned, be met for the evidence to be admissible in court. Furthermore, it may be fair to say that within the structure of Korea’s criminal prosecution, the processes involved in determining whether or not DNA evidence is credible may be part of what is needed to assess its probative value. At the moment, theoretical foundations of DNA analysis are deemed reliable with the overall approval of scientific circles, however there are improvements made all the time in standard analytical methodologies and procedures regarding their implementation and analytical techniques. This has created an unbridgeable gap between common knowledge and the outcomes of scientific research activities that legal experts, particularly trial judges, are left with no choice but to be more and more dependent on expert testimony when they assess the credibility of DNA evidence. Still, the more weight DNA analysis carries, the more likely serious errors in laboratory testing occur; thus, there is increased emphasis on how to keep the chain of custody in determining the admissibility of DNA evidence, for example, the qualification of those involved in testing, sample collection and preservation, stability of the testing methods that have been utilized, and conformance to analytical procedures. Therefore, if there is evidence that is crucial in determining guilt in crime, and the continuity of its preservation is closely related to the presence and integrity of the evidence concerned, namely DNA evidence, the defendant should be afforded the opportunity for the credibility of evidence to be tried in court during the entire processes of such evidence being collected, stored and analyzed to: prevent wrongful accusations; to make court proceedings more impartial; and to comply with appropriate procedures. To this end, cross examination of witnesses, disclosure of extensive evidence of the parties involved, and cross examinat

Identification and characterization of Dunaliella salina OH214 strain newly isolated from a saltpan in Korea

Minjae, Kim,Hyeon Jun, Oh,Khanh, Nguyen,EonSeon, Jin The Korean Society of Phycology 2022 ALGAE Vol.37 No.4

Carotenoids are effective antioxidants that are found in various photosynthetic organisms. Marine microalgae are an advantageous bioresource for carotenoid production because they do not compete with other crops for freshwater and arable land. This study reports a newly isolated Dunaliella strain from the Geumhong Saltpan on Yeongjong Island, West Sea, Korea. The new strain was isolated and classified as Dunaliella salina through phylogenetic analysis and was named the OH214 strain (Deposit ID: KCTC14434BP). The newly isolated strain can survive in a wide range of NaCl concentrations (0.3-5.0 M NaCl), but grows well in 0.6 to 1.5 M NaCl culture medium. Under high-light conditions (500 ± 10 μmol photons m^-2 s^-1), the cells accumulated three times more β-carotene than under low-light conditions (50 ± 5 μmol photons m^-2 s^-1). The cells accumulated 2.5-fold more β-carotene under nitrogen-deficient (1 mM KNO₃) conditions (3.24 ± 0.36 ㎍ 10⁶ cells^-1) than in nitrogen-sufficient conditions (>5 mM KNO₃). The lutein content under nitrogen-deficient conditions (1.73 ± 0.09 ㎍ 10⁶ cells^-1) was more than 24% higher than that under nitrogen-sufficient conditions. Under the optimized culture condition for carotenoid induction using natural seawater, D. salina OH214 strain produced 7.97 ± 0.09 mg g DCW^-1 of β-carotene and 4.65 ± 0.18 mg g DCW^-1 of lutein, respectively. We propose that this new microalga is a promising strain for the simultaneous production of β-carotene and lutein.

Scanning tunneling microscopy investigation of nano-structured α-K5PW11(M x OH2)O39(M = Mn(II), Co(II), Ni(II), and Zn(II)) Keggin heteropolyacid catalyst monolayers.

Choi, Jung Ho,Kang, Tae Hun,Bang, Yongju,Yoo, Jaekyeong,Jun, Jin Oh,Song, In Kyu American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.11

<P>Nano-structured α-K5PW11(M x OH2)O39 (M = Mn(II), Co(II), Ni(II), and Zn(II)) Keggin heteropolyacids (HPAs) were investigated by scanning tunneling microscopy (STM) and tunneling spectroscopy (TS) measurements in order to elucidate their redox property and oxidation catalysis. HPA molecules formed two-dimensional self-assembled monolayer arrays on highly oriented pyrolytic graphite (HOPG) surface. Furthermore, HPAs exhibited a distinctive current-voltage behavior referred to as negative differential resistance (NDR) phenomenon. The measured NDR peak voltage of HPAs was correlated with the reduction potential and the absorption edge energy determined by electrochemical method and UV-visible spectroscopy, respectively. NDR peak voltage of HPAs appeared at less negative voltage with increasing reduction potential and with decreasing UV-visible absorption edge energy. The correlations strongly suggested that NDR phenomenon was closely related to the redox property of HPAs. Vapor-phase oxidation of benzyl alcohol to benzaldehyde was carried out as a model reaction to track the oxidation catalysis of HPAs. NDR peak voltage appeared at less negative voltage with increasing yield for benzaldehyde.</P>

Laminar Lifted Methane Jet Flames in Co-flow Air

Narayan P. Sapkal,Won June Lee,Jeong Park,Byeong Jun Lee,Oh Boong Kwon 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12

The Laminar lifted methane jet flames diluted with helium and nitrogen in co-flow air have been investigated experimentally. The chemiluminescence intensities of OH* and CH₂O* radicals and the radius of curvature for tri-brachial flame were measured using an intensified charge coupled device (ICCD) camera, monochromator and digital video camera. The product of OH* and CH₂O* is used as a excellent proxy of heat release rate. These methane jet flames could be lifted in buoyancy and jet dominated regimes despite the Schmidt number less than unity. Lifted flames were stabilized due to buoyancy induced convection in buoyancy-dominated regime. It was confirmed that increased OH* and CH₂O* concentration caused an increase of edge flame speed via enhanced chemical reaction in buoyancy dominated regime. In jet momentum dominated regime lifted flames were observed even for nozzle exit velocities much higher than stoichiometric laminar flame speed. An increase in radius of curvature in addition to the increased OH* and CH₂O* concentration stabilizes such lifted flames.

Lysophosphatidic acid increases mesangial cell proliferation in models of diabetic nephropathy via Rac1/MAPK/KLF5 signaling

Kim, Donghee,Li, Hui Ying,Lee, Jong Han,Oh, Yoon Sin,Jun, Hee-Sook Nature Publishing Group UK 2019 Experimental and molecular medicine Vol.51 No.2

<▼1><P>Mesangial cell proliferation has been identified as a major factor contributing to glomerulosclerosis, which is a typical symptom of diabetic nephropathy (DN). Lysophosphatidic acid (LPA) levels are increased in the glomerulus of the kidney in diabetic mice. LPA is a critical regulator that induces mesangial cell proliferation; however, its effect and molecular mechanisms remain unknown. The proportion of α-SMA<SUP>+</SUP>/PCNA<SUP>+</SUP> cells was increased in the kidney cortex of <I>db/db</I> mice compared with control mice. Treatment with LPA concomitantly increased the proliferation of mouse mesangial cells (SV40 MES13) and the expression of cyclin D1 and CDK4. On the other hand, the expression of p27<SUP>Kip1</SUP> was decreased. The expression of Krüppel-like factor 5 (KLF5) was upregulated in the kidney cortex of <I>db/db</I> mice and LPA-treated SV40 MES13 cells. RNAi-mediated silencing of KLF5 reversed these effects and inhibited the proliferation of LPA-treated cells. Mitogen-activated protein kinases (MAPKs) were activated, and the expression of early growth response 1 (Egr1) was subsequently increased in LPA-treated SV40 MES13 cells and the kidney cortex of <I>db/db</I> mice. Moreover, LPA significantly increased the activity of the Ras-related C3 botulinum toxin substrate (Rac1) GTPase in SV40 MES13 cells, and the dominant-negative form of Rac1 partially inhibited the phosphorylation of p38 and upregulation of Egr1 and KLF5 induced by LPA. LPA-induced hyperproliferation was attenuated by the inhibition of Rac1 activity. Based on these results, the Rac1/MAPK/KLF5 signaling pathway was one of the mechanisms by which LPA induced mesangial cell proliferation in DN models.</P></▼1><▼2><P><B>Kidney disease: Mechanisms of diabetes-related damage</B></P><P>A potent molecular mediator of diabetic kidney disease induces its pathogenic effects via proteins that could be targeted with future drug therapies. Yoon Sin Oh
from Eulji University in Seongnam-si and Hee-Sook Jun from Gachon University in Incheon, both in South Korea, and colleagues treated certain cells found in the kidney’s glomerulus, the organ’s filtering unit, with a signaling molecule called lysophosphatidic acid (LPA) that is elevated in the blood of diabetic mice. They showed that LPA stimulated cellular proliferation and boosted the expression of proteins involved in regulating the cell cycle and a multipurpose signaling pathway. They then inhibited the activity of these proteins to prevent the kidney cells’ hyperproliferation, both in cell culture and in diabetic mice. The results highlight the potential of blocking mediators of LPA signaling to treat kidney-related complications of diabetes.</P></▼2>

Morgagni 탈장 : 1례 보고

오연희,이창욱,김승현,이성우,정병욱,이준희,박동일,권영무,신현종 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

Morgagni 탈장은 횡격막의 전내측 부위의 발달이상으로 열공을 통하여 장관이나 대망과 같은 복강내 구조물이 흉곽내로 빠져나가는 드문 질환으로 알려져 있다. 저자들은 호흡곤란을 주소로 내원하여 방사선학적 검사와 수술로 확진된 1례를 보고한다. Morgagni hernia is improperly located abdominal viscera into the thoracic cavity through the foramen of Morgagni which is a congenital defect at the anterornedial portion of diaphragm. We report a case of Morgagni hernia diagnosed by radiologic examination and operation.

만화 과제를 이용한 정신분열병 환자의 사회인지 능력의 측정

오정은,나명현,하태현,신용욱,노규식,홍순범,이경진,신민섭,이영호,권준수 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.3

Objectives : This study is to investigate the hypothesis that schizophrenic patients have difficulty in inferring mental state of others. Methods : Twenty schizophrenic patients and twenty normal subjects were administered to the Cartoon Task required inferring the character's intention in a given context. Results : The schizophrenic patients showed a statistically significant impairment in the Cartoon Task. Both groups chose the card depicting a frequent everyday action significantly more rather than the similar card to the last picture in each story for wrong answers. Conclusion : These preliminary results suggest that schizophrenia is associated with a specific deficit of the cognitive ability referred to as social cognition, and this deficit can be detected not only in the acute phase as found in previous research studies, but also in remission. Also when subjects fail to appreciate what is going on in the minds of other people, they seem to rely on a socially familiar experience.

베트남 다크투어리즘 유산의 현황과 활용에 관한 연구

오일환,윤병국,이준태 한국사진지리학회 2017 한국사진지리학회지 Vol.27 No.2

본 논문은 베트남 다크투어리즘 유산의 현황과 활용에 관한 연구를 목적으로 호치민 중심의 남부권역에 대한 전쟁유산의 구성요소와 양상을 고찰하였다. 베트남 다크투어리즘의 전쟁유산으로 하노이 중심의 북부지역은 전쟁의 승자와 패배자의 정치적 개념으로 상징화하면서 자연유산과 결합하고 있다. 중부지역은 후에, 미선 그리고 호이안의 전통문화유산과 DMZ지역의 전쟁유산을 접목하면서 다낭해변의 관광요소를 활용하고 있다. 호치민시를 중심으로 한 남부권역은 프랑스와의 독립항전과 미국에 대한 반전유적지 그리고 혁명유적지로서의 전쟁유산뿐 아니라 맹그로브 숲과 해변휴양관광을 결합하면서 메콩델타지역의 정치 경제적 중심공간으로 상징화하고 있다. 베트남 다크투어리즘의 전쟁유산은 역사 문화적 지역성이 투영된 장소적 진정성과 전쟁유산을 재현하고 기억하는 공간의 기념성을 융합하면서 중요한 관광요소로 활용하고 있다. 이와 함께 외세에 대한 저항정신과 항전으로 쟁취한 독립에 대한 자부심과 애국심을 확립하는 정신적 가치의 전쟁유산으로 활용하고 있다. The purpose of this study is to investigate the components and aspects of war heritage in the southern part of Vietnam, focusing on the present situation and usage of Vietnam`s Dark Tourism. In the northen region, the war heritage of Vietnam Dark Tourism is combined with the natural heritage symbolizing the political concepts of the winner and loser of the war. The central region uses coastal tourism elements with the traditional historical culture of the dynasty and the war heritage in the DMZ area. The southern region around Ho Chi Minh is represented as the united central space of the Mekong Delta, integrating the mangrove forest with the beach recreational tourism as well as the war heritage and anti-war relics as a revolutionary site that was against France for independence and against America by Vietnam war. Vietnam`s Dark tourism is an important tourism resource since it combines the regional authenticity of the historical and cultural aspects with the spatial memorial that recreates and reminds the war heritage. It is also used as a patriotic tourism resource that establishes self-esteem and nationalism for the independence against foreign countries by physical and spiritual resistance.

과학개념의 구성을 위한 하나의 과학 철학적 수업전략

오준영,강용희 경북대학교 사범대학 부속 중등교육연구소 2005 중등교육연구 Vol.53 No.2

이 연구의 목적은 학생들의 최초의 정신모형을 과학적 모형으로 변화시키기 위하여 과학철학을 도입하는 것이다. 우리는 'Lakatos의 연구프로그램'과 '과학적 실재론'을 주요한 틀로 하여 수업순서를 포함한, 하나의 과학 철학적 수업전략을 제안하였다. 이 연구는 다음과 같이 크게 세 가지 나누었다. 첫째로, 왜 과학철학을 과학교육에 적용해야하는가? 둘째, 이러한 전략의 배경이 되는 이론적 배경을 무엇인가? 셋째, 우리가 제안한 과학 철학적 수업전략은 어떤 구조로 이루어져 있는가? 결론적으로, 우리가 제안한 수업전략들은 우리가 학생들에게 기존의 정신모형을 재 조작하도록 도와주어, 우리가 목표로 하는 과학적 모형으로 기존의 구조들에 새로운 차원들, 혹은 새로운 특징들을 더해주는 것이다. The purpose of this paper was to introduce the philosophy of science in order to change from students' initial mental models to scientific models. We propose strategies of classrooms of the philosophy of science through the 'Lakatosian Research Programme' and the 'Scientific Realism' to guide a framework. This study is divided into three parts. First, Why the philosophy of science is to be suggested to science education. Second, What the rationale of the strategies are? Third, What Our suggested strategies of classrooms of the philosophy of science consisted of ? In conclusively, our suggested strategies in teaching is to help students reorganize existing mental model structures or to add dimensions, and new features to existing structures for new scientific models.