• 산업경영시스템학회지
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• 제43권1호
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• pp.61-69
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• 2020

Systems such as database and socal network systems have been broadly used, and their unexpected failure, with great losses and sometimes a social confusion, has received attention in recent years. Therefore, it is an important issue to find optimal maintenance plans for such kind of systems from the points of system reliability and maintaining cost. However, it is difficult to maintain a system during its working cycle, since stopping works might incur users some troubles. From the above viewpoint, this paper discusses minimal repair maintenance policy with periodic replacement, while considering the random working cycles. The random working cycle and periodic replacement policies with minimal repair has been discussed in traditional literatures by usually analyzing cases for the nonstopping works. However, maintenance can be more conveniently done at discrete time and even during the working cycle in real applications. So, we propose that periodic replacement is planned at discrete times while considering the random working cycle, and moreover provide a model in which system, with a minimal repair at failures between replacements, is replaced at the minimum of discrete times KT and random cycles Y. The average cost rate model is used to determine the optimal number of periodic replacement.

• 대한조선학회논문집
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• 제44권6호
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• pp.612-618
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• 2007

There are a lot of openings, holes and slots in ship structural members. It is not easy to solve the troubles around the openings adequately at the detail design stage, because there are a lot of concerning locations. There are not also clear design rules of classification societies and it is not possible to apply direct calculation for all the concerning members. Therefore, it is necessary to set up simplified approach such as a standard or guidance in order to decide the opening design quickly. For this study, guidance and regulations of each classification and several companies were surveyed. Grillage analysis and the refined mesh method were used to evaluate the strength around hole considering boundary condition and more detailed member arrangement. As a result, the standard for opening design was established and verified.

• 대한한의학원전학회지
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• 제13권1호
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• pp.74-101
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• 2000

Geungyul(根結) means roots and nodes of meridians. If human body gets damaged by energy which each seasons has, the meridians get some troubles. Healing for symptom, meridians consist of root, stay, follow, inpouring and node of acupuncture points should be in harmony. 1. This chapter explain roots and node parts of each meridian, acupuncture points name and root, stay, follow, inpouring of acupuncture points which in arm and leg of three Yin and Yang. 2. The opening, closing, axis function, the symptom, and the needling of both meridians of Yin and Yang are explained. 3. The method that predicts the rise-and-fall of visceral energy and the time of death by using an order of pulse and intermittent pulse is explained. 4. It is explained that since the physical condition of the rich and the poor are different, the method using a needling for each person to be healed, such as the deep-and-shallow and the quick-and-slow, are different. 5. It is explained that the excess and the deficiency in the energy of shape should be considered when a acupuncture is given.

• 반도체디스플레이기술학회지
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• 제2권1호
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• pp.7-9
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• 2003

In order to predict the moldability of an injection molded part, a simulation of filling is needed. Short shot is one of the most frequent troubles encountered during injection molding process. The adjustment of process conditions is the most economic way to troubleshoot the problematic short shot in cost and time since the mold doesn't need to be modified at all. But it is difficult to adjust the process conditions appropriately in no times since it requires an empirical knowledge of injection molding. In this paper, the intelligent CAE system synergistically combines fuzzy-neural network(FNN) for heuristic knowledge with CAE programs for analytical knowledge. To evaluate the intelligent algorithms, a cellular phone flip has been chosen as a finite element model and filling analyses have been performed with a commercial CAE software. As the results, the intelligent CAE system drastically reduces the troubleshooting time of short shot in comparison with the expert's conventional way which is similar to the golden section search algorithm.

• 한국운동역학회지
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• 제16권2호
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• pp.21-24
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• 2006

The purpose of this paper is to diagnose the errors by comparing putting motion with the single pendulum pattern applicable to putting in golf skill and order prescription that correct errors of putting. In the modern-day game of golf, putting remains the key to shooting low scores, and the ability to hole putts can turn a good round into a great round A semi-golfer, subject(sex female, age 20yrs, mass 94.3kg, height 1.65m) who has troubles to do putting is chosen. Six cameras, ProReflex MCU240(240Hz) made by Qualisys company is used to capture putting motion and data is processed by QTM(Qualisys Track Manager) and Mathematica 5.0. The result that differentiates the putting and the single pendulum pattern is acquired To make the pattern of subject's putting to the single pendulum pattern quasi-equal, one tries to lower center of mass gradually. As a result of it, one has a similar pattern like the single pendulum Conclusively, to lower C.O.M one orders prescriptions that increase the weight and length of a putter and lower C.O.M subject's segment. Further improvements to the study could be to train a subject according to prescriptions and to monitor putting again. It will probably be necessary to simulate putting motions and to research relations for body shapes and putting patterns in order to establish suitable putting-motions.

• 가족자원경영과 정책
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• 제9권4호
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• pp.63-80
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• 2005

This study examines the family concept and family-related values among pre-service home economics teachers. Questionnaires are completed by 242 pre-service home economics teachers. The results indicate that the respondents defined the family as a blood ties, a resting place, affection, and warmth. They tend to regard divorced, remarried, and adopted members as families, while classifying homosexual couples, members living together in a communal fashion, and great-great grandparents into nonfamily groups. Majority of them agree that it had better to get married or it depends on personal circumstances. In terms of cohabitation, they think it can be an opportunity to check the compatibility before marriage. Also, they perceive parenthood as a personal lifestyles, statement of social maturation, sound mind, and realization of morality. They agreed to divorce relatively high in case of unfaithfulness and relative troubles, but agreement of divorce was relatively low because of instrumental reason and psychological factors, The group majoring clothing and textile perceives the most negatively the influence of divorce to children. Further discussion and implications are discussed.

• 한국대기환경학회지
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• 제12권4호
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• pp.449-457
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• 1996

The main purpose of this study was to investigate sulfur dioxide removal performance of flue gas desulfurization system utilizing a Spray Absorption/Drying Reactor. In this system, the size of droplets was considered the most significant factor and tested using a PDA system. Lime slurry flow rate, operating temperature, calcium/sulfur (Ca/S) ratio and applied air pressure were selected as major operation variables and tested/analyzed in terms of system performance. The results are as follows. 1. The $SO_2$ removal efficiencies were 49%, 74%, 85% for Ca$(OH)_2$ slurry flow rate of 10, 20, 30 ml/min, which implies that the increase of slurry flow rate improves removal efficiency. The optimum slurry flow rate in this study was, however, considered 20 ml/min because of constraints of system troubles and absorbent utilization. 2. As Ca/S ratio increased, $SO_2$ removal efficiency was observed to increase. 3. As air pressure, at the atomizing nozzole, increased from 3 to 5 $kg/cm^2, SO_2$ removal efficiency increased from 74% to 80%, because of droplet size reduction due to pressure increase during atomizing process and the increase of surface area, helping mass transfer between gas and liquid phase.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1309-1315
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• 2004

전기철도차량에서 발생하는 고조파는 인접통신선에의 유도장애를 일으키고 철도신호장애의 원인이 될 뿐만 아니라 전원계통에 유입되는 경우에는 전력용 콘덴서의 과열을 유발시키고 주요장치의 계전기를 오동작 시킬 우려가 있다. 따라서 고속철도차량에서의 각 운전 모드별 고조파 실측을 하였으며 한국전력의 규제치를 상회함에 따라 최적대안으로 부하 측에 고조파 저감설비를 기존선 각 변전소(구로, 경산, 밀양)에 설치하였다. 이와 관련하여 본 논문에서는 고조파 저감 설비를 설치하기 전과 설치 후의 고조파 발생현황을 실제 측정하여 도표화하고 얼마만큼의 저감 효과가 있는지를 비교 검토하였다.

• 한국중재학회지:중재연구
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• 제12권2호
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• pp.115-151
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• 2003

As international trade and commerce increases among the nations in the world, it is inevitable fact that disputes rise as well. As these transactions grow more complex, it becomes increasingly important to resolve disputes and conflicts as quickly, efficiently and formatively as possible. In practical commercial affairs, we call a variety of international commercial troubles ‘trade claims’, Trade claims consist of disputes, controversies, or differences which may arise between the parties, out of, or in relation to, or in connection with their contracts, or for the breach thereof. Trade claim should be instituted promptly, otherwise it may be barred by prescription. Also, the other party will not accept the claim by reason of loss of evidence. In this connection, it should be noted that how long the claim prescription would continue. Trade claim should be settled reasonably and amicably between the parties concerned. And if both parties do not reach an agreement through their negotiation, then the claim shall be settled finally by binding arbitration. For the purpose of managing trade claim and arbitration, the trading parties insert in their contracts claim and arbitration clauses. This paper will examine some judicial precedents concerning claim clauses which are closely connected with a time limit of the claim It will also review some famous precedents rendered by the competent courts in connection with the wording, scope and implied renewal of arbitration clauses.

• 대한치과기공학회지
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• 제18권1호
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• pp.39-65
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• 1996

The purpose of this to inquire of the people who run a dental mechanical laboratory having troubles to manage and to find out the reform measures on the point at issue. With having done random sampling for the chiefs of dental mechanical labs across the nation, and then marking the analysis of the data for the survey, I came to a conclusion to be as follow. 1. The operating problems in dental mechanical laboratory in Korea is that it is too near at hand that the requested days for the manufacture of dental prosthesis appliances form dental clinics(45%)(P<0.01) 2. The problem of dental mechanic manpower was due to a small salary and inferior working environment(35% each)(P<0.01) 3. Some of them discount dental mechanical charges in manufacturing dental prosthesis appliances(36.7%)(P<0.01) 4. Many of them employed unlicensed dental technicians(61.7%)(P<0.01) As a counterplan for the aforementioned, I think that the whole dental mechanics should cooperate in breaking off the customary custom to allow a discount on the dental mechanical charges and readjust the dental mechanical charge to a realistic level so as to contribute to the development of the dental mechanical community and the vetterment of the public oral hygience.