• Journal of Information Technology Services
• /
• v.19 no.5
• /
• pp.33-47
• /
• 2020

In recent years, due to the demand for operating efficiency and cost reduction of industrial facilities, remote access via the Internet is expanding. the control network accelerates from network separation to network connection due to the development of IIoT (Industrial Internet of Things) technology. Transition of control network is a new opportunity, but concerns about cybersecurity are also growing. Therefore, manufacturers must reflect security compliance and standards in consideration of the Internet connection environment, and enterprises must newly recognize the connection area of the control network as a security management target. In this study, the core target of the control system security threat is defined as the network boundary, and issues regarding the security architecture configuration for the boundary and the role & responsibility of the working organization are covered. Enterprises do not integrate the design organization with the operation organization after go-live, and are not consistently reflecting security considerations from design to operation. At this point, the expansion of the control network is a big transition that calls for the establishment of a responsible organization and reinforcement of the role of the network boundary area where there is a concern about lack of management. Thus, through the organization of the facility network and the analysis of the roles between each organization, an static perspective and difference in perception were derived. In addition, standards and guidelines required for reinforcing network boundary security were studied to address essential operational standards that required the Internet connection of the control network. This study will help establish a network boundary management system that should be considered at the enterprise level in the future.

• Journal of the Korea Safety Management & Science
• /
• v.10 no.3
• /
• pp.29-33
• /
• 2008

According to statistics released by the Ministry of Labor for the past 6 years, work-related accidents in the construction industry have been on the continued increase, resulting in social and economic losses that are difficult to determine at an exact amount. However, the number will likely get much bigger if unreported cases are included, considering the fact that the aforementioned statistics are based soley on the applications filed with Korea Workers' Compensation and Welfare Service. The practice of businesses choosing not to report and dealing with industrial accidents in an unauthorized manner is defined as "concealment of industrial accident". The reason the employers tend to engage in the concealment practice even at their huge cost is a "pre-qualification" scheme for the applicants in the government procurement process. Under the pre-qualification scheme, the applicants with a high rate of industrial accidents receive a low grade and become less attractive candidates in the procurement process, thus losing an opportunity to win a contract. Such failure relates directly to the fate of business organizations, to survive or not. That is why they are making all-out efforts to obtain a high grade in the pre-qualification evaluation. With regard to the accident-concealment problem, the following can be mentioned as preventive measures: (1) To exclude a rate of industrial accidents from the pre-qualification scheme; (2) To strengthen the institution of imposing penalties on the occurrence of industrial accidents; (3) To introduce private insurance system to the current industrial accident compensation insurance; and (4) To give non-recognition treatment to industrial accidents that were not reported upon occurrence. In conclusion, the concealment problem can be resolved if the aforementioned measures are to be taken continuously along with corrective measures against institutional deficiencies.

• Journal of Institute of Control, Robotics and Systems
• /
• v.11 no.11
• /
• pp.956-962
• /
• 2005

This paper presents an integrated analysis of production and financing decisions. We assume that a cash storage unit is installed to manage the cash flows related with production activities such as raw material procurement, process operating setup, Inventory holding cost and finished product sales. Temporarily financial investments are allowed for more profit. The production plant is modeled by the Batch-Storage Network with Recycle Streams in Yi and Reklaitis (2003). The objective function of the optimization is minimizing the opportunity costs of annualized capital investment and cash/material inventory while maximizing stockholder's benefit. No depletion of all the material and cash storage units is major constraints of the optimization. A novel production and inventory analysis formulation, the PSW(Periodic Square Wave) model, provides useful expressions for the upper/lower bounds and average level of the cash and material inventory holdups. The expressions for the Kuhn-Tucker conditions of the optimization problem can be reduced to two subproblems and analytical lot sizing equations under a mild assumption about the cash flow pattern of stockholder's dividend. The first subproblem is a separable concave minimization network flow problem whose solution yields the average material flow rates through the networks. The second subproblem determines the decisions about financial Investment. Finally, production and financial transaction lot sizes and startup times can be determined by analytical expressions as far as the average flow rates are calculated. The optimal production lot and storage sizes considering financial factors are smaller than those without such consideration. An illustrative example is presented to demonstrate the results obtainable using this approach.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.26 no.3
• /
• pp.218-225
• /
• 2016

It is important to select the personnel with ideal pilot aptitude considering dramatically advancing aircraft performance and complexity of military operations as a consequence to the highly developed science and technology. The opportunity cost lost from dropouts and human error being the first cause of aviation accidents are the realistic reasons for the significance of personnel selection based on their aptitude. This study analyses the ROKAF pilot aptitude test that was improved in 2004, using various classification models. This study discusses the significance of the selected variables along with the direction of ROKAF pilot aptitude test for its development in the future. The accuracy of the classification models was improved by taking into account differing personnel characteristics of individuals on the test.

• The Journal of Information Systems
• /
• v.27 no.3
• /
• pp.43-62
• /
• 2018

Purpose Since the Bitcoin, which was the first virtual currency, was made at 2009, almost 1,000 virtual currencies appeared onstage in the world. Even though virtual currencies have the function of money as a medium of exchange or contract, any of those has not yet entered the commercialization stage. Instead, some of the virtual currencies show the nature of investment assets. In the case of virtual money investment, users tend to use all the information of the world because information transfer is very easy and capital movement is almost free between different countries. In addition, as the transaction sizes of virtual currencies increase, a virtual currency price is no longer independent and is likely to be affected by the prices of other virtual currencies. Therefore, it is necessary to understand the influence among virtual currency markets, which helps successful implementation of investment strategies. Design/methodology/approach This study focuses on the investment product function of virtual money and conducts the analysis using the time series model used in the financial and economic areas. In this paper, we try to analyze the return and volatility transfer effect of virtual money markets through GJR-GARCH model. Findings This study is expected to find out whether we can make market forecasts through reflecting changes in other markets. In addition, we can reduce the trial and error of user decision making by using the information on the yield and volatility transition effect derived from the research results, and it is expected to reduce the opportunity cost of users.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.17 no.2
• /
• pp.15-25
• /
• 1989

The purpose of this study was to supply data of resident′s participation direction about children′s playground management. In this study, use disposition and consciousness of resident about management are investigated and analyzed at the 5 children′s playground in Taegu city. The results of this study were as follows: The result of resident′s use disposition showed ; visiting frequency was "everyday or occasionally(53.5% )", and visiting purpose was "for children(47.9 %), for rest, sports, spare time(24.6%)" and visiting time was equal1y except forenoon, and staying time was "within 1 hour(73.1%)". The satisfaction about park facilities and park existence of residents′ is composed importance degree of which is convenient, manyfunction spaces, managemental of tree and facilities in order. 9.3% of residents were proposal experience about management, and concern ratio of circumferenmce showed highly "concerned answer(45.9%)" About consciousness ratio of management subject, 46.5% of residents depended on authorities leading. Wholly, recognition ratio showed low. Park administration of authorities leading and lack of resident′s concern wore thought as its problem. About experience of cleaning beautification rout children′s playground, 14.2% of residents answered "be experience". Participation type of desirous management showed highest "cleaning of fallen leaves and rubbish(22.7% )". So, residents wished to take part in such simple managements. Charge of necessary tool and cost for management showed highest "partial charge of residents (47.9% )". About participant ratio of self government activity made by residents, 75.1% of residents answered "don′t be participated". A reason of nonparticipation showed "insufficiency of place and opportunity (38.7%), deficiency of time(17.97)". Activity of initiative and existing group can be done as a fine device in future. Desirous events for children and residents showed highest "play guidence for children or meeting for aged milan(40.7% )". Therefore, it will have to consider enough about resident′s participation program for activity of use and efficient management of children′s playground.

• Journal of the Economic Geographical Society of Korea
• /
• v.5 no.2
• /
• pp.209-228
• /
• 2002

The purpose of this paper is to evaluate strategies for the attraction of Korean finns into EU Objective 1 (less prosperous region).2(regions facing structural difficulties or conversion) on the basis of Korean foreign direct investment in the European Union(EU) in the past 10 years (the late 1980s-late 1990s). Of such strategies the most important was incentive packages for Korean finns by those regions. Nonetheless, these packages did not contribute to the development of the finns and regions because of limits to the finns' competitiveness(cost competitiveness) and the regions' competitiveness(low productivity and skills). Consequently, these strategies of EU Objective 1.2 regions did not provide an opportunity for pathways to successful development because the incentive packages provided to the finns and regions without the consideration of their internal and external circumstances.

• Fashion & Textile Research Journal
• /
• v.16 no.4
• /
• pp.564-579
• /
• 2014

Packaging of shopping bag is a 'silent salesman' which plays an important role in marketing communication due to the increase of self-service outlets and changing lifestyles of customers. Retail shopping bags, which are defined as bags provided by retailers to customer as a means of transporting merchandise, are a type of secondary packaging. This study explored the effect of a fashion product's shopping bag types in sense of shopping value, customers' response, attitude toward advertising, and purchase intention. Data was analyzed by factor analysis, frequency analysis, correlation, structural equation modeling using SPSS 18.0 and AMOS 18.0. The results of this study were as follows. Consumers' responses about shopping bags show that there are some differences between consumers who have either hedonic or utilitarian shopping value. Hedonic shopping value influences on consumers' response as unique, interesting, and attention; however utilitarian value affects prestige in addition to those four significant factors. Therefore, this study shows that consumer response is different in accordance with shopping value. Thus, using the various types of shopping bags can be influenced on effective advertising. It will also great effect on marketing activity with lower cost. The significant result from this study has proven that the shopping bag is correlates to the definition of pop art today because it can offer an opportunity to look at, play with and buy sophisticated visual stimulus. Therefore, retail and brands have to concern about shopping bag considering their decisive role in the apparel market.

• Journal of muscle and joint health
• /
• v.6 no.2
• /
• pp.242-252
• /
• 1999

The purpose of this study was to explore self management of pain by folk remedies in patient with chronic arthritis. The participant of this study were 90 volunteers who were visit C hospital and who want to counsel with researcher for their pain control by convenient sampling method. The results of this study were summarized as follows : The subjects were the 90 patients who had been diagnosed rehumatoid arthritis(52.5%)and osteoarthritis(47.8). 93.3% of participants were women. Mean age of participants was 53.7 and duration of arthritis was 7 years. Mean pain score was 5.5cm. Eighty five kinds of folk remedies were used for pain management. The mean cost for folk remedies was 3,723,207 won and the patients with rheumatoid arthritis paid to folk remedies as much as 3 times. The perceived effect score of pain management by folk remedies was 2.932(the range of perceived effect score were 0-10cm). Percentage of discontinue to use folk remedies was 82.8% and the major reason of discontinue to use folk remedies was no effect to pain control(50.4%). Some participants(30.5%) were experienced side effect such as exacerbation of pain(50.5%). In conculusion, chronic arthritis patients have been experienced various kind of folk remedies for the management of their pain. But the effect of pain control was very low. The important weakness of folk remedies were economical waste and loss of opportunity to treatment for arthritis. The nurse who care for arthritis should be teach about weakness of folk remedies for their pain control to the patients with arthritis.

• Asian-Australasian Journal of Animal Sciences
• /
• v.28 no.3
• /
• pp.451-455
• /
• 2015

The buffalo is an important livestock resource in several countries of South Asia and the Mediterranean regions. However, reproductive efficiency is compromised due to known problems of biological and management origins, such as lack of animal selection and poor nutrition. Under optimal conditions puberty is attained at 15 to 18 months in river buffalo, 21 to 24 months in swamp buffalo and is influenced by genotype, nutrition, management and climate. However, under field conditions these values deteriorate up to a significant extant. To improve reproductive efficiency, several protocols of oestrus and ovulation synchronization have been adopted from their use in commercial cattle production. These protocols yield encouraging pregnancy rates of (30% to 50%), which are comparable to those achieved in buffaloes bred at natural oestrus. The use of sexed semen in buffalo heifers also showed promising pregnancy rates (50%) when compared with conventional non-sexed semen. Assisted reproductive technologies have been transferred and adapted to buffalo but the efficiency of these technologies are low. However, these latest technologies offer the opportunity to accelerate the genetic gain in the buffalo industry after improving the technology and reducing its cost. Most buffaloes are kept under the small holder farming system in developing countries. Hence, future research should focus on simple, adoptable and impact-oriented approaches which identify the factors determining low fertility and oestrus behaviour in this species. Furthermore, role of kisspeptin needs to be explored in buffalo.