• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.28 no.2
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• pp.211-221
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• 2018

Objectives: The purpose of this study was to identify work-related risk factors associated with upper extremity symptoms among construction workers using the fourth Korean Working Condition Survey(KWCS). Methods: Subjects were 2,724 construction workers selected from 50,007 respondents in the 2014 KWCS. The presence or absence of upper extremity symptoms and work-related risk factors, including individual, physical, and psychosocial factors, were used as variables. A multiple logistic regression analysis was performed in order to evaluate the relationship of the upper extremity symptoms with work-related risk factors. Results: Upper extremity symptoms were significantly associated with: employment type(OR: 1.57, 95% CI: 1.18~2.09); job satisfaction(OR: 2.06, 95% CI: 1.33~3.18); verbal abuse(OR: 2.06, 95% CI: 1.33~3.18); tiring or painful posture(OR: 2.33, 95% CI: 1.73~3.15); carrying or moving heavy loads(OR: 1.68, 95% CI: 1.23~2.24); repetitive hand or arm movement(OR: 1.42, 95% CI: 1.06~1.91) Conclusions: In order to prevent the upper extremity musculoskeletal disease in the construction industry, it is necessary to stabilize employment, enhance job satisfaction, and eliminate violence in the workplace and improve physical work environment.

• Journal of the Korea Society of Computer and Information
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• v.27 no.8
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• pp.151-160
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• 2022

In this paper, we propose an algorithm that enables near-field delivery at a faster and lowest cost to meet the growing demand for delivery services. The algorithm proposed in this study involves subway passengers (shipper) in logistics movement as delivery sources. At this time, the passenger may select a delivery logistics matching subway route. And from the perspective of the service user, it is possible to select a delivery man whose route matches. At this time, the delivery source recommendation is carried out in a text similarity measurement method that combines TF-IDF&N-gram and BERT. Therefore, unlike the existing delivery system, two-way selection is supported in a man-to-man method between consumers and delivery man. Both cost minimization and delivery period reduction can be guaranteed in that passengers on board are involved in logistics movement. In addition, since special skills are not required in terms of transportation, it is also meaningful in that it can provide opportunities for economic participation to workers whose job positions have been reduced.

• Korean journal of communication and information
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• v.57
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• pp.69-83
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• 2012

This paper attempts to explore the development of the media labor movement and its tasks. Due to the unique characteristics of information delivered by media, the media labor movement under the authoritarian regime was oppressed and regulated by the government. As democratization has proceeded, the state's oppression and regulation of media has been weakened. However, media workers should wage the struggle for union recognition and independence of editorship simultaneously. Because media unions as labor market organizations also seek for job security and wage increase, we need to understand both political dimension and economic dimension of union activities in media industry. While state's control over media has been diminished in the late 1900s, competition in media industry has been intensified. As small number of media corporations monopolizes the media market, the ecology of media has been completely transformed. Unions in media industry should respond to the change of the media ecology and should build solidarity among media workers at the same time. The achievement of the public nature of media as a part of democratization and building union federation of media industry as a response to the marketization of media still remain as an epochal task for media unions. Like the case of "Hope Bus" in the strike in Hanjin Heavy Industrial Corporation, solidarity between citizens and striking workers should be strengthened.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.8
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• pp.1241-1249
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• 1997

The problem of structural topology optimization can be relaxed and converted into the optimal density distribution problem. The optimal density distribution must be post-processed to get the real shape of the structure. The extracted shape can then be used for the next process, which is usually shape optmization based on the boundary movement method. In the practical point of view, it is very important to get the optimal density distribution from which the corresponding shape can easily be extracted. Among many other factors, the presence of checker-board patterns is a powerful barrier for the shape extraction job. The nature of checker-board patterns seems to be a numerical locking. In this paper, an efficient algorithm is presented to suppress the checker-board patterns. At each iteration, density is re-distributed after it is updated according to the optimization rule. The algorithm also results in the optimal density distribution whose corresponding shape has smooth boundary. Some examples are presented to show the performance of the density re-distribution algorithm. Checker-board patterns are successfully suppressed and the resulting shapes are considered very satisfactory.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.997-1000
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• 2005

Dynamic job shop environment requires not only more flexible capabilities of a CAPP system but higher utility of the generated process plans. In order to meet the requirements, this paper develops an algorithm that can select machines for the machining operations to be performed by predicting the machine loads. The developed algorithm is based on the multiple objective genetic algorithm that gives rise to a set of optimal solutions (in general, known as Pareto-optimal solutions). The objective shows a combination of the minimization of part movement and the maximization of machine utility balance. The algorithm is characterized by a new and efficient method for nondominated sorting, which can speed up the running time, as well as a method of two stages for genetic operations, which can maintain a diverse set of solutions. The performance of the algorithm is evaluated by comparing with another multiple objective genetic algorithm, called NSGA-II.

• Journal of Labour Economics
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• v.23 no.1
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• pp.137-165
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• 2000

This paper empirically analyzes the behavioral patterns of the labor flows surrounding self-employment. One of the findings is that, while a substantial portion of the labor flows into (and from) the self-employment sector is a movement from (and into) the non-employment, such flows are largely confined to a relatively small group of marginal workers. Still, the share of those marginal workers among the self-employed has declined steadily at least until the outburst of the financial crisis in 1997, evidencing that the job stability has been increased in this sector. On the other hand, the expected duration of self-employment has shown a downward trend up until 1990 but has increased since then. Such a trend reversal is also observed in the proportion of the labor force self-employed, indicating that the former is at least partly responsible for the latter.

• Journal of the Korean Home Economics Association
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• v.49 no.6
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• pp.23-37
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• 2011

This research tried to identify how different types of environments related with work-family reconciliation effects the amount of resource exchange between working mothers and their child. In this study, we applied theoretical concepts such as 'Defamiliarization'(rights of mothers to access the work force without any environmental obstacles) and 'Familiarization'(a movement trying to balance work with family and child). This study is an analysis of valid questionnaires filled out by 220 female respondent's who was holding a job and also had children attending elementary, middle, or high school at the time answering the survey questionnaire. Results of this survey are as follows. Mother's attitudes toward familiarization and child's school environments related with defamiliarization had critical effects on mother's perceived resource exchange. And in a further analysis, among the clustered groups of mothers the group which consists of mothers who try to work hardly on both work and family had the highest degree of the resource supplies to their child.

• Journal of the Korea Fashion and Costume Design Association
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• v.9 no.1
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• pp.203-219
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• 2007

The education chance and job opportunity of women have increased in the 19th century. Also, women tried to get the right and chance equal to men in this period. Therefore, the population of women participating in the sports have increased. And comfortable and practical pantaloons which men have been wearing were suggested to women. This study investigated the characteristics and change of women's sports wear relating to social change in the 19th century. The results of this study were as follows: 1. According to the social change, women participated in the sports activities with the opportunity equal to men, and the appropriate women's sports wear was needed. 2. Pantaloons which were suggested as the clothing reform movement became popular with the development of sports wear. 3. Simple, effective, comfortable and easy style sports wear was preferred. 4. Women accepted men's sports wear positively. 5. The women's sports wear varied according to the various kinds of sports. 6. The healthful design was preferred and harmful design was excluded. 7. Underwear was improved functionally and simplified. 8. The main materials were flannel, wool, tweed, homespun and serge, and the mail colors were brown, dark blue, gray and black.

• Journal of Mechanical Science and Technology
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• v.18 no.1
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• pp.132-144
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• 2004

This paper presents a new method driving multiple robots to their goal position without collision. To consider the movement of the robots in a work area, we adopt the concept of avoidability measure. The avoidability measure figures the degree of how easily a robot can avoid other robots considering the velocity of the robots. To implement the concept to avoid collision among multiple robots, relative distance between the robots is proposed. The relative distance is a virtual distance between robots indicating the threat of collision between the robots. Based on the relative distance, the method calculates repulsive force against a robot from the other robots. Also, attractive force toward the goal position is calculated in terms of the relative distance. These repulsive force and attractive force are added to form the driving force for robot motion. The proposed method is simulated for several cases. The results show that the proposed method steers robots to open space anticipating the approach of other robots. In contrast, since the usual potential field method initiates avoidance motion later than the proposed method, it sometimes fails preventing collision or causes hasty motion to avoid other robots. The proposed method works as a local collision-free motion coordination method in conjunction with higher level of task planning and path planning method for multiple robots to do a collaborative job.

• Journal of Korean Library and Information Science Society
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• v.49 no.2
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• pp.105-129
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• 2018

Efforts to establish a joint preservation facility for library materials are being discussed in the regional representative libraries recently, but this is mainly a movement in public libraries. This study aimed to provide a model for a joint preservation facility construction and management especially for the National Universities Library in Busan/Gyeongnam area. For this job, after analyzing the current situation, this study focuses on 1) estimated size of the planned facility calculated by investigating the size and equipment, operation policy, collection quantity and saturation status of participating library archives, 2) strategies for construction, proposed a joint preservation architecture construction management model such as organization and human resources, and standards for transferring materials.