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Exact holography of the mass-deformed M2-brane theory
Jang, Dongmin,Kim, Yoonbai,Kwon, O-Kab,Tolla, D. D. Springer-Verlag 2017 European Physical Journal C Vol.77 No.5
<P>We test the holographic relation between the vacuum expectation values of gauge invariant operators in N = 6 U-k (N) x U-k (N) mass-deformed ABJM theory and the LLM geometries with Z(k) orbifold in 11-dimensional supergravity. To do so, we apply the Kaluza-Klein reduction to construct a 4-dimensional gravity theory and implement the holographic renormalization procedure. We obtain an exact holographic relation for the vacuum expectation values of the chiral primary operator with conformal dimension Delta = 1, which is given by < O-(Delta=1)> = N (3/2) f(Delta = 1), for large N and k = 1. Here the factor f(Delta) is independent of N. Our results involve an infinite number of exact dual relations for all possible supersymmetric Higgs vacua and so provide a non-trivial test of gauge/gravity duality away from the conformal fixed point. We extend our results to the case of k not equal 1 for LLM geometries represented by rectangular-shaped Young diagrams. We also discuss the exact mapping of the gauge/gravity at finite N for classical supersymmetric vacuum solutions in field theory side and corresponding classical solutions in gravity side.</P>
Exact Holography of Massive M2-brane Theories and Entanglement Entropy
Jang, Dongmin,Kim, Yoonbai,Kwon, O-Kab,Tolla, D. D.,Gwak, B.,Kang, G.,Kim, C.,Kim, H.-C.,Lee, C.-H.,Lee, J.,Lee, S.,Lee, W. EDP Sciences 2018 The European Physical Journal Conferences Vol.168 No.-
<P>We test the gauge/gravity duality between the <I>N</I> = 6 mass-deformed ABJM theory with U<I>k</I>(<I>N</I>) × U<I>-k</I>(<I>N</I>) gauge symmetry and the 11-dimensional supergravity on LLM geometries with <I>SO</I>(4)=ℤ<I>k</I> × <I>SO</I>(4)=ℤ<I>k</I> isometry. Our analysis is based on the evaluation of vacuum expectation values of chiral primary operators from the supersymmetric vacua of mass-deformed ABJM theory and from the implementation of Kaluza-Klein (KK) holography to the LLM geometries. We focus on the chiral primary operator (CPO) with conformal dimension Δ = 1. The non-vanishing vacuum expectation value (vev) implies the breaking of conformal symmetry. In that case, we show that the variation of the holographic entanglement entropy (HEE) from it’s value in the CFT, is related to the non-vanishing one-point function due to the relevant deformation as well as the source field. Applying Ryu Takayanagi’s HEE conjecture to the 4-dimensional gravity solutions, which are obtained from the KK reduction of the 11-dimensional LLM solutions, we calculate the variation of the HEE. We show how the vev and the value of the source field determine the HEE.</P>
Estuary classification method for considering climate change effects in South Korea
Jang, Dongmin,Hwang, Jin Hwan BioOne (Coastal Education and Research Foundation) 2013 JOURNAL OF COASTAL RESEARCH Vol.65 No.-
<P>Sea level rise attributed to climate change is expected to affect the estuaries of South Korea significantly. The seawater intrudes into the beds of river channels and into aquifers near the coastal zone, and such processes are expected to be magnified in the climate change regime. Further, flooding and erosion are expected to be intensified at the shorelines of rivers and in coastal zones. Such adverse effects are expected to occur, which will depend on the individual characteristics of different estuaries. Some of these characteristics include the volume of a tidal prism, the length of shoreline peripheral, and the bathymetries in the estuaries. Our present work modified the existing estuary classification systems to be more responsive to climate change; in particular, we have included the wave change impact. Many studies have proposed estuarine classifications recognizing the various features of each estuary. There are several ways to classify estuaries. First, estuaries can be classified with the Estuarine Circulation Classification (ECC) system. Second, Geomorphological Classification (GC) categorizes estuaries with the dominances among physical components. Third, Estuary Environment Classification (EEC) classifies with indices representing the physical processes and estuary shapes. However, these existing methods did not involve qualitative categorizations and also excluded the wave factor. They also did not include a category for the artificial estuaries, which are prevalent in Korea. Therefore, efficiently constructing a comprehensive response plan for the climate change based on these existing classification systems was not possible. Thus, a new quantitative method including the wave index and considering the artificial estuary is proposed here that can be utilized in a response to climate change.</P>
초등 예비교사와 경력교사의 국어과 교수·학습 과정안 읽기 양상 비교 분석: 시선추적장치를 활용하여
장동민(JANG DONGMIN) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.3
본 연구는 초등 예비교사와 경력교사의 국어과 과정 중심 쓰기 교수·학습 과정안 읽기 양상을 분석하였다. 이에 따라 과정중심 쓰기 과정안의 전체 흐름을 읽는 방식 확인, 수업 과정 정보를 읽는 양상 확인의 연구 문제를 설정하였다. 연구 문제를 해결하기 위해 시선추적장치(Eye-Tracker)와 회상적 사고 구술법을 활용하였다. 연구 대상자로 실험군의 예비교사 집단, 비교군의 경력교사 집단을 선정하여 실험을 수행 하였다. 연구 기간은 2020년 8월부터 10월 초까지였다. 실험 결과, 예비교사는 과정 안의 전체 흐름에 대하여 이해보다는 숙지하려고 하였으며, 국어과 교수·학습 이론을 실천적 지식으로의 연결에 대하여 미숙함을 보였다. 또한, 국어과 교수·학습 모형및 방법이 과정안에 어떻게 실현되고 있는지 파악하기 어려워함을 알 수 있었다. 결과를 바탕으로, 국어과 교수·학습 과정안 문식성(Literacy) 신장을 중심으로 예비교사 양성 교육에 대한 시사점을 도출하였다. This study analyzed the aspects of elementary school pre-service teachers reading of Korean language process writing lesson plan. Accordingly, a research problem was set up to confirm the reading method of the entire flow of the plan course and the aspect of reading information on the plan course. Eye-tracker and retrospective verbal protocol were used to solve research problems. The experiment was conducted by selecting a group of pre-service teachers in the experimental group and a group of career teachers in the comparative group. As a result of the experiment, the pre-service teacher tried to memorize the whole flow of the course rather than understanding it, and he was inexperienced in connecting the theory of teaching and learning Korean to practical knowledge. In addition, it was difficult to figure out how the Korean language department s teaching and learning models and methods were realized in the course. Based on the results, the implications of education for training prospective teachers were derived based on the enhancement of literacy in the Korean language department s teaching and learning plan course.
국내 OEM/ODM 화장품 제조기업의 생산계획 및 효율화를 위한 분산형 MRP시스템 개발
장동민(Dongmin Jang),신문수(Moonsoo Shin) 한국산업경영시스템학회 2020 한국산업경영시스템학회지 Vol.43 No.4
Up to date cosmetic OEM/ODM (original equipment manufacturing/original development manufacturing) industry receives attention as a future growth engine due to steady growth. However, because of limited research and development capability, many companies have employed commercial management platforms specialized for large-sized companies; thus, overall system effectiveness and efficiency is low. Especially, MRP (material requirement planning) system introduced originally in 1970s is employed to calculate the requirement of the parts. However, dynamic nature of production lead time usually results in incorrect requirements. In addition, its algorithm does not consider the capability of the production resources. Also, because the commercial MRP system calculates all subcomponent for fixed period, the more goods have subcomponent, the slower calculation is. Therefore, conventional MRP system cannot respond complicated situation in time. In this study, we will suggest a new method that can respond to complicated situations resulting from short lead time and urgent production order in Korean cosmetic market. In particular, a distributed MRP system is proposed, that consists of multi-functional and operational modules, based on the characteristic of the BOM (bill of material). The distributed MRP system divides components (i.e. products and parts) into several fields and decrease the problem size; thus, we can respond to dynamically changed data any time. Through this solution, we can order components quickly, adjust schedules and planned quantity, and manage stocks reasonably. In addition, a prototype of the distributed MRP system is presented in this paper, in which ERP (enterprise resource planning) sever data is associated with an excel spreadsheet via MSsql. System user interface is implemented by a VBA (visual basic for applications) tool. According to a case study, response rate for delivery and planning achievement rate were enhanced about 20%, and inventory turnover was also decreased. Consequently, the proposed system improves overall profit.