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이해각 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.3 No.3
본 논문은 최소 수리가 가능한 시스템에 대한 최적 검사 정책을 제시한다. 시스템의 이상 유무를 확인하기 위하여 주기적으로 검사를 실시하며 고장이 발견되면 고장 원인을 제거하는 최소 수리를 실시한다. n번째 검사 후에는 시스템 전체를 교체한다. 또한 수리 될 때까지 지속된 고장은 시스템에 지연 시간에 비례하는 비용을 초래한다고 가정한다. 본 논문은 이러한 상황에서 단위 시간당의 기대 비용 함수를 구하고 이를 최소화하는 검사 주기와 시스템 전체를 교체하는 최적 시점을 구하는 알고리즘을 제시한다.
대퇴 동맥 천자 완료 후 지혈 방법의 정량적 비교 분석
이해각,조재환 순천향대학교 부설 산업기술연구소 2013 순천향 산업기술연구소논문집 Vol.19 No.1
This study assessed the advantages and shortcomings of methods for hemostasis in patients who had received angiography after femoral arterial puncture using manual, compression devices and a combination of manual and compression device. In addition, the success rates, complications, etc. were analyzed. One hundred and eighty patients who had undergone angiography after femoral arterial puncture were divided into three groups according to the method of hemostasis. For group A, immediately after angiography, Angioseal was placed in the punctuation area and compressed using a compression device. For group B, after angiography, the punctuation area was compressed with the hands directly. For group C, the punctuation area was compressed using a compression device for approximately 10 minutes, and the punctuation area was then compressed with the hands. The results showed a similar time to hemostasis regardless of gender or generation. The correlation between the hemoglobin value, platelet value, and the time to hemostasis was not significant. Group A showed the shortest mean time to hemostasis of the three groups (20.37 ± 8.23 minutes). No complications caused by the hemostasis method were detected in group B. Group A showed the highest incidence of complications caused by hemostasis.
이해각 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1
In this paper, an automation computer program is implemented on the quality control and management department of mass production system. First, a program which controls is coded for the data-input procedure. Second, an analysis program is implemented. We can supervise the manufacturing process state by using the program and the outputs of the programs are used for the quality warrenty for customers.
이해각,조재환,조대철 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.9
This study investigated differences between the physical wedge and the dynamic wedge distributions of radiation by using an intensity-modulated radiotherapy (ImRT) MatriXX. The linear accelerator used X-rays with energy levels of 6 MV and 10 MV to adjust the collimator by motoring the independent jaws (X1, X2, Y1, Y2) for setting wedge angles of 15, 30, 45, and 60 degrees. The collimator field size was set as 10 × 10 cm2 or 20 × 20 cm2 at the maximum dose point. The dose distribution for each wedge had ±5% and ±11% errors for field sizes of 10 × 10 cm2 and 20 × 20cm2, respectively. The error was greatest at a wedge angle of 45 degrees and was pronounced at the end of the dynamic wedge where Y1 and Y2 met. Consequently, concluded that the dose distributions were similar for both wedges for the field size of a small beam profile. The beam dose was greatly increased at the end of the dynamic wedge. A more precise estimate of the therapeutic dose of radiation for a dynamic wedge that nearly matches that of the physical wedge can be achieved by correcting of the increasing part of the beam dose. The findings imply that a heavy wedge filter should not be used when calculating the isodose distribution and the therapeutic dose.
이해각 순천향대학교 부설 산업기술연구소 2006 순천향 산업기술연구소논문집 Vol.12 No.1
In this paper, a process monitoring system is implemented and tested. The data for monitoring is transferred from the production facilities to computer through PLC(Programmable Logic Controller). The analog signals of the facilities activities which are generated by using the several sensor switches are transferred to the PLC. And then, the PLC converts these analog signals to digital signal, and send the digital signal to a computer. The implemented computer program detects and recognizes which events occur on the facilities by analyzing these signals. The program monitors the facility states and reports them to a database system. Several useful statistics can be retrieved from the stored data in the database system. The implemented program can be easily applied to various types of automated systems, for example, the home automation and etc.
사용자 클러스터링을 위한 개량된 K-평균 알고리즘의 구현
이해각 순천향대학교 부설 산업기술연구소 2004 순천향 산업기술연구소논문집 Vol.10 No.2
The user clustering for web navigation pattern discovery is very useful to get preference and behavior pattern of users for web page, And also, such informations are very essential for web personalization or customer grouping. In this thesis, an algorithm for clustering the user's web navigation path is proposed and then some special navigation pattern can be recognized by the results of algorithm. The proposed algorithm has two clustering phases. In the first phase, all paths are classified into k-groups on the bases of the their similarities. In order to establish the similarity measure, each path is transformed into a feature vector, and as angle between two feature vectors is used as a measure of the similarity. In the measure, the smaller angle a pair of vectors have, the more similarity is guaranteed. The solution obtained in the first phase is not global optimum but it gives a good and feasible initial solution for the second phase. In the second phase, the first phase solution is improved by the revised k-means algorithm, in which grouping the paths is performed by the hyperplane instead of the distance between the each path and the group center. Computational results show that the proposed method is more efficient and time-saving, but it requires huge computer memory spaces.
이해각 순천향대학교 1994 논문집 Vol.17 No.1
본 논문은 단일 서버가 m개의 stage(대기장소)를 서비스하는 주기적 대기행렬 모형을 다룬다. 각 stage에서의 고객 입력분포는 Poisson분포를 따르고, 단일 서버가 각 stage를 돌아가며 주기적으로 서비스한다. 각 stage에서 서버는 일정 기간 동안만 서비스하고 서비스 기간이 끝나면 다음 stage로 가서 서비스를 계속한다. 이러한 대기행렬 시스템에서 고객의 평균대기시간을 구하고 이를 최소화하는 서버의 각 stage에 대한 최적 서비스 기간을 결정한다.