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몬테카를로 방법에 의한 수소분자의 기저상태 에너지의 수치 해석적인 계산
양해정,양회룡,정진,김미정,최승평,장차익 조선대학교 기초과학연구소 2000 自然科學硏究 Vol.23 No.1
Numerical methods that are known as Monte as Monte Carlo methods can be loosely described as statistical simulation methods, where statistical simulation is defined in quite general terms to be any method that utilizes sequences of random numbers to perform the simulation. Monte Carlo methods are now used routinely in many problems, the simulation of the esoteric subnuclear processes in high energy physics experiments, cellular automata, self-organized critical phenomena, the Ising spin glass, the simulation of a Bingo game, etc. The physical processes are simulated directly, and there are no needs to even write down the differential equations that describe the behaviors of the systems. The only requirement is that the physical systems be described by probability density functions. We consider with the Monte Carlo variational method and the Monte Carlo path integral method(MCPI). These methods are used to calculate the energy of the ground states of H2 molecule by the formal similarity between the Schroedinger equation and the multi-dimensional diffusion equation.
Global transcriptome analysis of the E. coli O157 response to Agrimonia pilosa extract
양해정,Yune Suk Jung,김기석,최은경,Dong Jin Lim,안광석,정희재,Sung-Ki Jung,Hyeung-Jin Jang 대한독성 유전단백체 학회 2011 Molecular & cellular toxicology Vol.7 No.3
Antibiotics are certainly beneficial to treat the bacterial infection. However, inappropriate use puts patients at danger for avoidable adverse drug reactions. This inappropriate use accelerates the emergence of resistance and potentially increases overall health-care costs. In oriental pharmacology, herbal medicines had been used as an antibiotic drug, but its antibiotic mechanism has not yet been proved completely. Here, we studied the antibiotic effects of Agrimonia pilosa on E. coli O157:H7. Especially, it is noteworthy that the antibiotic efficacy of the herb extract on three proven targets for a main antibiotic drug: bacterial cell wall biosynthesis, protein synthesis and DNA replication and repair. The results show the antibiotic effects through the inhibition of bacterial cell wall synthesis, folic acid synthesis, and multidrug efflux.
양해정(Hae-Jeong Yang),이재학(Jai-Hak Lee),서정환(Jeong-Hwan Seo) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.2
Recently, the use of assembled-type drills as environmentally friendly products has expanded because the shanks of drills can be reused by replacing the tip when the tools are worn or cut. In addition to their precision and endurable stiffness with respect to the cutting force, assembled-type drills need no stricture because of thermal deformation, which makes replacement easily. In this study, we developed novel assembled-type drills and compared their characteristics, such as the precision, stiffness, and thermal deformation, with those of conventional drills. The new drills exhibited a precision over IT 8 class and no changes in dimensions due to thermal deformation, such that we can change the assembly easily with durability.
양해정 ( Hye-jung Stephan Yang ),김태완 ( Tae-wan Kim ),이기준 ( Ki-joune Li ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
이동 객체의 위치 정보는 현재 위치뿐만이 아니라 과거 움직였던 궤적 데이터 역시 데이터마이닝과 같은 응용분야에서 중요하다. 대부분의 기존 연구에서 사용하는 GPS(Global Positioning Service) 위치정보는 이 차원 유클리디안 공간의한 점과 시간만으로 표현된다. 우리는 이러한 표현이 가지는 내재적인 문제점들을 지적하고 이를 해결할 수 있는 새로운 방법을 제시한다. 본 논문에서 우리는 이동 객체의 움직임은 기본속도모델을 따라 움직인다고 가정하고 이를 이용하여 다양한 움직임의 형태를 표현하고 이러한 표현에 의하여 달성할 수 있는 저장 및 처리의 효율성에 대하여 연구한다. 실제 데이터를 이용한 분석에서 우리는 이동 객체가 우리가 제시하는 속도 모델에 따라 움직인다는 사실을 보여주고, 제시하는 표현 방법이 저장뿐만이 아니라 성능적인 면에서도 기존 GPS 위치정보 표현보다 월등하다는 사실을 보여 준다.
Estimating Radiation Risk Induced by CT Screening for Korean Population
양원석,양해정,민병인 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.4
The purposes of this study are to estimate the radiation risks induced by chest/abdomen computed tomography (CT) screening for healthcare and to determine the cancer risk level of the Korean population compared to other populations. We used an ImPACT CT Patient Dosimetry Calculator to compute the organ effective dose induced by CT screening (chest, low-dose chest, abdomen/pelvis, and chest/abdomen/pelvis CT). A risk model was applied using principles based on the BEIR VII Report in order to estimate the lifetime attributable risk (LAR) using the Korean Life Table 2010. In addition, several countries including Hong Kong, the United States (U.S.), and the United Kingdom, were selected for comparison. Herein, each population exposed radiation dose of 100 mSv was classified according to country, gender and age. For each CT screening the total organ effective dose calculated by ImPACT was 6.2, 1.5, 5.2 and 11.4 mSv, respectively. In the case of Korean female LAR, it was similar to Hong Kong female but lower than those of U.S. and U.K. females, except for those in their twenties. The LAR of Korean males was the highest for all types of CT screening. However, the difference of the risk level was negligible because of the quite low value.
차혁렬,양해정,김미정,정진,양회룡,최승평,장차익 조선대학교 기초과학연구소 1999 自然科學硏究 Vol.22 No.1
The one-electron theory of atoms, molecules, and crystals have enjoyed a wide success in many branches of physics. This theory provides a physically appealing description of the electronic structure of many-electron systems. In addition, this theory gives a convenient basis for performing the detailed calculation on specific many-electron systems. In such calculations, it is usually necessary to introduce many simplified assumptions in order to make a progress. Since the principal computational difficulty supposed by the Hartree-Fock equations is the treatment of the exchange term, it would be very desirable to simplify the treatment of these terms by using Slater's average of the exchange potential. The first order correction of energy in the lowest excited states of He atom is calculated by using the unperturbed wave function obtained with the Hartree-Fock-Slater approximation and compared with the result obtained by the simple analytical method. The numerical results agrees with an experimental results for the lowest excited states of He atom with tolerance 3.22%, 2.16%, 2.94% and 3.41%. These results show that the numerical analysis can be applied to other multielectron atoms with the personal computer.
레이저 회절 측정기를 이용한 벤츄리 캐비테이션에서의 마이크로버블 발생 특성 연구
임윤규,양해정,김영일 사단법인 유공압건설기계학회 2019 드라이브·컨트롤 Vol.16 No.1
The use of micro bubbles in industrial fields has been increasing in the recent years., particularly micro-bubble sterilization and water purification effects. Various methods have been developed for the generation of micro-bubbles. Depending on the method of generating bubbles, the micro-bubbles can be roughly classified into saturation molding, cavitation and rotation flow types. The objective of this study was to use ventilated tube type as a method of generating micro-bubbles in order to purify large amount of water quality such as lakes and reservoirs. This method shows a difference in efficiency in which micro-bubbles are generated depending on the contact ratio of gas to liquid. The study also investigated the optimal gas․liquid contact ratio by applying various orifice methods and investigated the optimum condition of micro-bubble generation by gas․Based on this, a technology to develop a micro-bubble generator with a venturi type nozzle shape that has a high water purification effect was developed.
유대영,양해정,양회룡,정진,최승평,장차익 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-
It is difficult to explain the magnetic phase transition with classical physics in Curie temperature. We studied qualitatively with the well known Ising model in statistical mechanics. We simulated systems of finite size by Monte Carlo methods with Metropolis algorithm. Thus we could estimate the values of quantities such as the magnetization(m) per spin the specific heat(c) per spin the magnetic susceptibility(χ) per spin, and the mean energy per spin compare with the numerical values in infinitive size. The quantities of c, m, χ, e varied rapidly within 2.3∼2.4 temperature at J/k units. Those values show that the critical temperature can be within the range. The hysteresis loop was obtained with this model.