버스 네트워크에서의 최적 부하배분 알고리듬

김형중,Ghose, D. 강원대학교 정보통신연구소 1997 정보통신논문지 Vol.1 No.-

A bus network of communicating processors is anlayzed. The processors in the network are equipped with front-end processors. The problem is to determine an optimal partitioning of a matrix to compute matrix-vector multiplication so that these individual parts can be computed independently in several processors in minimum time. Some important results are proved analytically using the closed form solution.

강산 및 강알칼리 음독에서 냉각 용액을 사용한 희석 요법과 중화 요법의 가능성

이중의,송형곤,김동훈,권운용,곽영호,서길준,윤여규 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3

Background: There is no effective treatment modality for caustic agent ingestion. Dilution and neutralization are prohibited because of the risk of secondary thermal injury. This experiment is designed to evaluate the amount of dilution and neutralization heat and to gauge the applicability of dilution and neutralization therapy using cold solutions to suppress the peak temperature. Methods: This is an in-vitro chemical experiment. HCl, CH3COOH, NaOH, and NH4OH are selected as representatives of strong and weak acids and strong and weak alkali, respectively. 20℃, 11.6M, 5.8M, and 2.9M solutions of each acid and alkali are made and mixed using a magnetic stirrer at a room air temperature of 28℃. The peak temperature, the duration above 40℃, and the heat amount are measured or calculated. Results: When a 11.6M HCl or NaOH solution is diluted with same amount of water, 32 or 18cal. per mL of HCl or NaOH is produced, respectively. HCl produces a significant peak temperature, but NaOH does not. The lower the concentration, the lower the amount of heat production. 11.6M CH3COOH and NH4OH solutions don't produce dilution heat.11.6M and 5.8M solutions of all acids and alkali produce destructive neutralization heat. However, 2.9M solutions produce neutralization heat which might be controllable. When a 11.6M HCl or NaOH solution is neutralized with a -10℃ 2.9 M NaOH or HCl solution, respectively, the peak temperature produced is below 40℃ and seems to add little thermal damage to viable tissue. Conclusion: Dilution and neutralization with a cold solution in cases of strong acid or alkali ingestion is a promising method to avoid thermal injury.

컴퓨터비젼을 이용한 알루미늄 캔재 이어링률 자동 측정 시스템 개발

이용중,김형조,이양범 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

The main purpose of this paper is the development of the system which measures the earing rate of aluminum CAN with the CCD camera. In order to optimize imput image, the image object was segregated and the position of the image grasped. In the pre-processing the edges were detected by the Robert mask after improving the definition of image by the histogram equalization. The height of four each ear and angles which occur due to the characteristics of the aluminum CAN are measured manually with the digital vernier calipers in the industrial ground and in the case of the velocity, these require 30 seconds at least by three times measurement per height of one direction of the aluminum. But it took 0.02 seconds when this system was applied. Therefore this system is proven the satisfactory efficiency and reliability as compared to the control result of in industrial ground.

근전도 시스템을 이용한 테니스 퍼스트와 세컨드 서비스의 생체역학적 연구-남ㆍ여 고교 테니스선수를 중심으로 : 남ㆍ여 고교 테니스선수를 중심으로

이중숙,강재형,유창재,양정옥,이훈식 가톨릭대학교 자연과학연구소 2001 自然科學論文集 Vol.9 No.-

This study selected each seven high-school tennis players of male and female and analyzed the M.RA according to the type of tennis service and the Muscle Active Potential of M.ES by using an electromyogram system. The results as follows; 1.The Muscle Active Potential of female tennis players is higher than that of male tennis players in M.RA according to Tennis Service Types. 2.The Muscle Active Potential of female tennis players is higher than that of male players in M.ES according to Tennis Serrice Types. 3.In male and female M.RA, the Muscle Active Potential of right and left showed the contrary results. 4.In male and female M.ES, the Muscle Active Potential is high in the second service in the case of male and in the first service in the case of female. 5.Female tennis player can improve efficiency in the aspect of biomechanics by strengthening the muscle of M.RA and M.ES. 6.The second service of male tennis player showed less efficient Muscle Active Potential than his first service because of excessive trunk muscle twist.

MP-2에서 타원형 편미분 방정식 병렬계산

김형중,이용호 江原大學校 産業技術硏究所 1994 産業技術硏究 Vol.14 No.-

일반적으로 2차원 Poisson 방정식을 풀기 위해 유한 차분법을 이용하여 tridiagonal block Toeplitz 선형방정식을 얻는다. 이 선형방정식의 독특한 형태를 활용하기 위해 Lyapunov 방정식으로 변화시킨 다음 이산정형변환(DST)을 이용해서 대각선 행렬로 만들면 계산이 용이해진다. 또 DST는 FFT를 이용해 계산할 수 있으므로 고속 계산이 가능하다. FFT를 병렬로 처리하기 위해 프로세서가 4,096개인 SIMD 컴퓨터 MP-2에서 시뮬레이션했다. 본 논문에서는 알고리즘 유도, 매핑 및 시뮬레이션 결과를 제시했다. We can get a tridiagonal block Toeplitz linear system by the finite difference approximation of 2-D Poisson equation. To exploit the nice property of this linear equation, we transform the equation into'a Lyapunov equation and apply DST(discrete sine transform) to get diagonal matrix based Lyapunov equation. DST can be performed using FFT, which enables high-speed computaion. All the computations are performed on an SIMD parallel computer, the MasPar MP-2 with 4,096 processing elements. In this paper, parallel algorithm, mapping method of the algorithm onto the MP-2, and timing results are presented.

뇌동맥류성 지주막하 출혈 후 지연허혈신경결함에 대한 평가에 있어서의 Acetazolamide단일광자방출전산화 단층촬영술의 역할

김형중,김은영,하윤,윤승환,박형천,박현선 The Korean Neurosurgical Society 2004 Journal of Korean neurosurgical society Vol.35 No.2

LAN Monitoring에 Hijacking기법의 도입을 통한 인터넷 유해 정보로부터 사용자의 보호 시스템 개발

박형배,정중수 安東大學校 工業技術硏究所 1997 공업기술연구논문집 Vol.4 No.1

The Internet is emerging as a powerful tool in the area of information and communication technology. The WWW has been especially contributed to the increasement of the Internet demand because of its browser which has "Graphic User Interface". Nowadays number of hosts that supply harmful information such as pornographic materials, and the infringement of human rights is rapidly increased. Access to such materials is very easy. Therefore security system which will protect young users from access to harmful host is needed. This paper presents implementation of user protecting system with LAN monitoring based on hijacking method over TCP/IP network. This system has database about harmful hosts at the Internet and monitors that the user traffic over LAN get touch with the hosts. The system can not make the user access the harmful host because it can decide whether the host requested by the user is harmful or not according to monitoring the traffic over LAN.

원격탐사를 위한 병렬계산 기법

김형중,장태정,김희원,김형수,이정문,장순자 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-

원격탐사에 사용되는 편미분방정식을 고속으로 풀기 위한 기법을 프로그래밍하고 성능을 향상시킬 수 있는 방법을 제시했다. 미지수가 30만개 이상되는 복소수(non-Hermitian) 행렬의 해를 구하는 프로그램을 작성했다. 이 프로그램은 C와 PVM에 기반을 두고 있다. 수렴속도를 향상시키기 위해 대각 스케일링을 이용했다. 통신속도의 개선을 위해 데이터 압축 기법을 이용했다. 수렴속도를 측정 제시함으로써 실제 문제 적용에 참고할 수 있다. Network-based computing with cluster of personal computers or workstations recently has become an important and successful technique. Network-based computing enables fast computation and resolves short of storage with computers on the desks. Cluster of inexpensive computers offers them aggregated computing power and storage to challenge very large-scale problems. Iterative solvers are used for the large sparse linear systems. Preconditioners accelerate the rate of convergence of the iterative solvers. However, parallelization accelerate the rate of convergence of the iterative solvers. However, parallelization of preconditioners is far from satisfaction so far. Thus, the simplest diagonal scaling is a good alternative for improved convergence and easy parallelization. In order to reduce communication overhead, a data compression technique is considered. Data communication time can be reduced at the cost of convergence rate. MATLAB simulation result is given in this paper. This method is effective to cluster of computers connected through slow networks.

웨이블릿 영역에서 상관함수를 이용한 3-State 블라인드 디지털 워터마크

최용수,김형중 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-

The content's authentication is very important in the field of Digital Multimedia Contents which is based on the Internet. There are several methods to perform the authentication. The Watermarking is the one of those methods. This paper's every process is based on the image application. The proposed watermarking method has the 3-State information and performs the embedding and the detection without reference Content. when we authenticate the Owner Information, it uses correlation function. The special feature is embedding the watermark depends on the original contents and using the DWT(Discrete Wavelet Transform) Domain when it is applying the SS(Spread Spectrum) method. therefore, certain extra probability of error will be reduced. and DWT is more faster than other transform method(DFT, DCT etc). When we use N size image, the computation can reduce from O(N·logN). and we can hide some more information per bit. In this experiment, We used some general signal processing (such as Noise Addition, Compression, Scaling etc.) as the Attacks.

신아세포종에 병발된 폐 색전증 1예 보고

박용욱,김형중,서중석 大韓法醫學會 1999 대한법의학회지 Vol.23 No.1

Wilms' tumor is the most common urinary tract neoplasm and one of the most frequent solid abdominal malignant tumors of childhood, usually diagnosed between the ages of 2 and 5 years. Typically, it is manifested as an asymptomatic unilateral or upper abdominal mass. Abdimonal pain after some traumatic incident, fever, anemia, hematuria and hypertension are other patterns of presentation. In a considerable number of these patients, pulmonary metastases are present at the time of primary diagnosis. But, the initial presentation of acute pulmonary tumor emboli without surgical manipulation is very rare. We describe a sudden unexpected infantile death case diagnosed as pulmonary tumor embolism preexisting Wilms' tumor. To our knowledge, this is the initial autopsy presentation of Wilms' tumor with tumor embolism as sudden and unexpected death in Korea.