• 산업경영시스템학회지
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• 제22권52호
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• pp.117-139
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• 1999

This paper is concerned about the hybrid tandem configuration as the design of the automated guided vehicle system(AGVs). The hybrid tandem configuration is that the manufacturing system is divided into several non-overlapping zones, workstations of each zone are linked by network configuration including loop. That is, the manufacturing system is divided into several non-overlapping small size networks, and at most two automated guided vehicles can be available in each network. The transit point is located at proper point between adjacent networks. The parts are transported to workstations in other network through the transit points. One of the objective functions in dividing into the hybrid tandem configuration is to minimize the maximum travel time of the divided networks, and other is to minimize the total travel distance of parts moved to workstations in other networks for the next processing. The model formulation is presented, and a numerical example is shown. Also, the performances of system for the hybrid tandem, tandem and network configuration are compared through the simulation. The results of this research will contribute to the development of material handling systems in the manufacturing system. Also, it will be applied in determining the transportation area of transportation vehicles and the number and size of the transportation fleet in the transportation problem of logistics management.

• 한국운동역학회지
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• 제17권4호
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• pp.169-179
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• 2007

The purpose of this study was to investigate the relations between the segments of the body and to qualitatively analyze coordination pattern of joints and segments during Sweep Shot movement in Ice Hockey, by utilizing coordination variables was angle vs. angle plots. By the utilization the three dimensional anatomical angle cinematography, the angles of individual joint and segment according to sweep shot in ice hockey. The subjects of this study were five professional ice hockey players. The reflective makers were attached on anatomical boundary line of body. For the movement analysis three dimensional cinematographical method(APAS) was used and for the calculation of the kinematic variables a self developed program was used with the LabVIEW 6.1 graphical programming(Johnson, 1999) program. By using Eular's equations the three dimensional anatomical Cardan angles of the joint and ice hockey stick were defined. The three dimensional anatomical angular displacement and coordination pattern of trunk and Upper limb(shoulder-elbow, elbow-wrist linked system) showed important role of sweep shot in ice hockey. As the result of this paper, for the successful movement of sweep shot in ice hockey, it is most important role of coordination pattern of trunk-shoulder, shoulder-elbow and elbow-wrist. specially turnk movememt as a proximal segment. Coordination pattern of Upper Limb(upperarm-forearm-hand) of Sweep Shot movement in Ice Hockey that utilizes coordination variables seems to be one of useful research direction to understand basic control mechanisms of Ice hockey sweep shooting linked system skill. this study result showed flexion-extension, adduction-abduction and internal-external rotation of trunk are important role of power and shooting direction coordination pattern of upper Limb of Sweep Shot movement in Ice Hockey.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.296-299
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• 2015

돌고래호 사건과 세월호 사건으로 인하여, 선박에서 발생하는 통신에 대한 육지와 구난 시스템과의 비상 통신 문제가 되고 있다. 3면이 바다로 되어 있는 우리나라의 입장에서는 해상 구난과 비상 재난을 위한 연계 통신 시스템에 대한 점검이 필요해졌다. 해상에서 항해하는 선박은 단독으로 재난을 처리해야 하므로 연계 통신 시스템이 보다 완전하게 갖추어 져야 한다. 해상에서 침수되어 침몰하는 선박과 잠수함에 대한 비상 통신에 대한 연구가 필요하다. 육지에서는 해상과 해저의 선박 및 잠수함의 비상 재난에 대비한 육상 연계 통신과 연계 통신 시스템에 대한 연구가 필요하다. 본 논문은 통신 프로토콜과 비상 재난을 대비한 위치 확인 및 육상과 통산을 위한 비행기나 인공위성과의 연계시스템을 연구한다.

• 멤브레인
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• 제19권4호
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• pp.333-340
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• 2009

본 연구의 목적은 중금속 흡착을 위한 방사선 그라프트 중합법에 의한 이온교환막의 성능 향상을 위한 것이다. 그라프트 체인의 이온교환기에 의해 체인이 막의 pore를 방해하여 투과유속이 크게 저하되는 문제를 해결하고자 그라프트 체인과 체인사이를 N-ethyleneglycoldimethacrylate계 가교제를 첨가하여 투과유속이 저하되는 문제를 해결하고자 했다. 이때 사용된 가교제는 길이가 서로 다른 ethylene glycol dimethacrylate (EDMA)와 diethylene glycol dimethacrylate (DDMA)를 사용하였다. GMA 막에 가교제가 첨가된 이온교환막에 술폰산기를 첨가한 막을 이용하여 중금속 이온($Pb^{2+}$) 흡착을 하였다. 술폰산기 밀도가 1.40 mmol/g인 EDMA막은 13.82 mg/g을 흡착하였고, 술폰산기 밀도가 2.14 mmol/g인 DDMA막은 17.37 mg/g의 흡착량을 보였다.

• Journal of Preventive Medicine and Public Health
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• 제55권3호
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• pp.253-262
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• 2022

We aimed to review the current data composition of the Korean Tuberculosis and Post-Tuberculosis Cohort, which was constructed by linking the Korean Tuberculosis Surveillance System (KNTSS; established and operated by the Korean Disease Control and Prevention Agency since 2000) and the National Health Information Database (NHID; established by the National Health Insurance Service in 2012). The following data were linked: KNTSS data pertaining to patients diagnosed with tuberculosis between 2011 and 2018, NHID data of patients with a history of tuberculosis and related diseases between 2006 and 2018, and data (obtained from the Statistics Korea database) on causes of death. Data from 300 117 tuberculosis patients (177 206 men and 122 911 women) were linked. The rate of treatment success for new cases was highest in 2015 (86.7%), with a gradual decrease thereafter. The treatment success rate for previously treated cases showed an increasing trend until 2014 (79.0%) and decreased thereafter. In total, 53 906 deaths were confirmed among tuberculosis patients included in the cohort. The Korean Tuberculosis and Post-Tuberculosis Cohort can be used to analyze different measurement variables in an integrated manner depending on the data source. Therefore, these cohort data can be used in future epidemiological studies and research on policy-effect analysis, treatment outcome analysis, and health-related behaviors such as treatment discontinuation.

• 공학교육연구
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• 제19권6호
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• pp.3-9
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• 2016

Amonng many creative problem-solving methodologies, the TRIZ with practicality and applicability has been utilized a lot in practice and education. This research introduced the TRIZ course for engineering problem-solving training to engineering college students. Then, a survey about students' ability to solve engineering problems after the TRIZ course were analyzed statistically. Finally, problem-solving cases of industry in each team project were examined. It is proved that an understanding of the TRIZ should be confirmed on that can be applied and utilized and can be linked to well performing team projects. Therefore, it is determined that more active efforts are required for the development of TRIZ learing methods to improve the education system to help students improve comprehension for students in creative problem-solving skills.

• International Journal of Precision Engineering and Manufacturing
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• 제8권1호
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• pp.38-45
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• 2007

We propose a preprocessing method for removing floating particles from underwater images based on an analysis of the image features. We compared baseline JPEG and wavelet codec methods to determine the method best suited for underwater images. The proposed preprocessing method enhanced the compression ratio and resolution, and provided an efficient means of compressing the images. The wavelet codec method yielded better compression ratios and image resolutions. The results suggest that the wavelet codec method linked with the proposed preprocess method provides an efficient codec processor and transmission system for underwater images that are used for searches and transmitted via ultrasonic communications.

• Industrial Engineering and Management Systems
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• 제6권1호
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• pp.28-39
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• 2007

The issue of customer-centric enterprise focusing on realizing customer needs has recently received considerable attention in the corporate world. However, little research has yet been reported on developing Information Systems (IS) supporting the customer-centric enterprises. This research proposes an integrated approach of IS development that supports organizations aiming to become customer-centric enterprises using various customer profiles. In this paper, we propose an integrated approach unifying goal modeling, business process modeling, and information systems modeling. The approach is expected to be seamlessly linked with the object-oriented systems development approach. Finally, we apply this approach to the real case of a securities company in Japan.

• Coupled systems mechanics
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• 제5권1호
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• pp.87-100
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• 2016

In this work, an improved semi-analytical technique is adopted to track the dynamic response of thin rectangular plates excited by sequential traveling masses. This technique exploits a so-called indirect definition of inertial interaction between the moving masses and the plate and leads to a reduction, in the equations of motion, of the number of time-varying coefficients linked to the changing position of the masses. By employing this optimized method, the resonance of the plate can be obtained according to a parametric study of relevant maximum dynamic amplification factor. For the case of evenly spaced, equal masses travelling along a straight line, the resonance velocity of the masses themselves is also approximately predicted via a fast methodology based on the fundamental frequency of the system only.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1990년도 하계학술대회 논문집
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• pp.92-95
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• 1990

It is important to analize voltage drop exactly in distribution systems. However the average length of a feeder is about to 40 km long and the exact modelling of a sectional share is very difficult. An efficient simplified model is necessary for dealing with such a long and complicated feeders. Especially, distribution feeders are linked to customers directly and maintaining the end voltages within the regulation is very important. This paper introduces distribution load factor for simplifing the complicated feeders in a proper manner. Test results show the more enhancement of accuracy and the better applicability in field sense.