• International Journal of Automotive Technology
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• v.8 no.2
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• pp.155-163
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• 2007

The control of the fuel to be introduced into the combustion chamber under idling and low-load conditions is known to be a problem in Diesel engines, owing to the relatively small fraction of the full-load fuel needed under light loads. Thus, particular attention should be paid to the behavior of the injector with reference to short injection events. This work presents the results of an experimental campaign carried out with two different types of common rail injectors, a standard injector and a modified one. The latter, coming from a simple modification realized in a standard injector, exhibits linear behavior between injected fuel and solenoid energizing time in the field of short injections. A direct comparison of the two injection behaviors suggests a possible way to better control short or pilot injections.

• Journal of Korean Institute of Industrial Engineers
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• v.39 no.3
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• pp.198-203
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• 2013

Industry convergence is the inexorable trend, which has become a fundamental concept to understand the industrial dynamics and to develop business strategies. However, most of the previous studies on convergence have dealt with the issues at the macro-level (technology- or industry-level), little attention has been paid to the analysis of convergence at the micro level (firm-level). Recognizing that firms are the principal agents that develop fusion technologies, it is encouraged to help firms to work together for technology convergence. Therefore, this research proposes a collaboration model for SMEs, since SMEs tend to have novel ideas and are flexible enough to make fusion-technology. To do this, we conducted a survey for Korean SMEs and analyzed their successful cases of collaboration, which was used as a basis to develop the model. The research results will help develop strategy or policy to promote the collaboration between SMEs and ultimately to make a fusion-technology.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.23 no.54
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• pp.129-135
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• 2000

This paper proposes six systematic steps that aimed at eliminating safety problem as far as possible. In the proposed steps, it is emphasized that attention should be paid not only to physical conditions but also to psychosocial conditions, as unsatisfaciory psychosocial work environment in many cases has proved to contribute to safety problems. The most common obstacles to obtaining positive intervention results are also described. These are lack of commitment from the line managers point of view, neglecting to engage technicians and employee concerned, ignoring to take psychosocial conditions into consideration, and ignoring the impact of the proposed changes on the wage system and the organizational system The proposed steps are based upon gradually developed and empirically tested existing method aimed at solving the problems.

• Journal of architectural history
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• v.30 no.2
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• pp.45-54
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• 2021

During the latter part of Joseon Dynasty, Local Confucian School(Geochanghyanggyo) had served as a government school and left many official documents on the educational construction. The construction of Local Confucian School(Geochanghyanggyo), which was recorded in official documents, was diverse, and most of them were reconstructed. Construction-works recorded in an official document was drafted in two ways. One was in the same format as the accounting records and the other was written in the diary format by date. The construction cost was mainly financed by selling the land owned. Of course, with the help of the government, they could receive some of the essential timber and expenses for the construction. The management and maintenance of educational construction was entrusted by a manager called 'Chaji(次知)'. Then there were employees called 'Jeonjik(殿直)' and 'Gojik(庫直)' and they were paid for their work.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.11a
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• pp.114-115
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• 2019

Gangform is used as exterior wall forms in the most of apartments. Existing system forms developed for high-rise building, RCS and ACS, are too heavy and over-designed to be applied to general apartments, leading to higher costs. A more simplified rail Gangform(R/GF) is also used, but it depends entirely on T/C for the lift like Gangform. The T/C's legal inactivity time for moving Gangform and materials has increased, and the higher allowances have to be paid for overtime work, thus causing to the cost increase and time delay. Therefore, this study aims to develop an automated Gangform climbing system that can be used universally and economically in apartment houses. The use of the development system is expected to improve the safety of Gangform operations and reduce the workload on T/C.

• Educational Technology International
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• v.22 no.2
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• pp.311-339
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• 2021

This study examined the effects of scaffolding types (Toulmin's Argument Pattern: TAP or Argumentation Vee Diagram: AVD) and individual metacognition levels (low or high) on students' learning achievement in online collaborative argumentation. A total of 191 Chinese undergraduates took part in this study. They were randomly assigned to either the TAP scaffolding, AVD scaffolding, or no scaffolding condition. They were teamed up in small groups of two or three students to argue with their peers using SNS as the online collaborative argumentation environment. The results revealed that students in the TAP and AVD scaffolding conditions did not gain significantly higher retention or transfer scores than students without scaffolding. However, students in the TAP scaffolding condition significantly outperformed those in the AVD scaffolding condition on transfer scores. Individual metacognition did not significantly affect learning achievement in online collaborative argumentation. Additionally, there was no significant interaction effect between scaffolding types and individual metacognition levels on retention or on transfer. The findings have implications for scaffolding design for online collaborative argumentation and also suggest that more attention should be paid to social metacognition rather than to individual metacognition when students work collaboratively.

• Journal of Preventive Medicine and Public Health
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• v.55 no.6
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• pp.499-505
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• 2022

Despite advances in medicine and preventive strategies, fewer than 1 in 5 people with hypertension have the problem under control. This could partly be due to gaps in fully elucidating the etiology of hypertension. Genetics and conventional lifestyle risk factors, such as the lack of exercise, unhealthy diet, excess salt intake, and alcohol consumption, do not fully explain the pathogenesis of hypertension. Thus, it is necessary to revisit other suggested risk factors that have not been paid due attention. One such factor is psychosocial stress. This paper explores the evidence for the association of psychosocial stressors with hypertension and shows that robust evidence supports the role of a chronic stressful environment at work or in marriage, low socioeconomic status, lack of social support, depression, anxiety, post-traumatic stress, childhood psychological trauma, and racial discrimination in the development or progression of hypertension. Furthermore, the potential pathophysiological mechanisms that link psychosocial stress to hypertension are explained to address the ambiguity in this area and set the stage for further research.

• Korean Journal of Social Welfare
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• v.64 no.2
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• pp.31-54
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• 2012

Along with increasing mothers' employment, work-family reconciliation has been recognised as a key policy agenda in contemporary welfare states. Although various policy instruments have been introduced and expanded in recent years, the problem of time allocation within couples still remains as a fundamental issue, which has been largely underresearched at a micro perspective. In this context, this study aims to identify dominant types of work-family time allocation within married couple, and to apply these types to the Korean case using the fuzzy-set ideal type analysis. Further, a series of multiple regression analyses will be implemented to find factors affecting each ideal type of work-family time allocation. The 1999 and 2009 Korea Time Use Survey datasets will be adopted for the analyses. Married couples are selected as samples only when men work 40 hours or more per week and they have at least one pre-school child. Empirical analyses cover three parts. First of all, four ideal types on work-family time allocation are classified by intersecting two core variables - the ratio of men's (paid) working and family (caring time plus domestic work) time to total working and family time. In this research, the four types will be labelled the traditional male breadwinner model (TM, high working and low family time), the dual burden model (DB, shared working but low family time), the family-friendly male breadwinner model (FM, high working but shared family time), and the adaptive partnership model (AP, shared working and shared family time). By comparing the composition of the four ideal types in 1999 and 2009, it will examine the trend of work-family time allocation in Korea. In addition, multiple regressions will be useful for investigating which characteristics contribute to the different degree of each fuzzy ideal score in the four models. Finally, policy implications and further research agenda will be discussed.

• Korean Journal of Social Welfare Studies
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• v.45 no.2
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• pp.31-63
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• 2014

Recently interest in civic engagement and civic service is increasing. However, in Korea, few studies have focused on civic service. This might be on account of general awareness that civic service is fundamentally different from the basic spirit of voluntary work, while interest in paid volunteer work is on the rise. Thus, it is necessary to examine whether civic service is the real antipode of volunteer work. Under this kind of critical viewpoint, this study aims to analyze civic service based on the attributes of voluntary work and civic service. The major findings are as follows. Firstly, contrary to common belief, civic service has not been established to go beyond the principle of voluntary and unpaid characteristics of volunteer work. Rather, some voluntary work has broken out of principle of voluntary activities. Secondly, civic service and volunteer work might be characterized as different not due to spontaneity and unpaid service but the structural characteristics of the goal, continuity and formality. Furthermore, the reason for the soft landing of civic service in the United States is not because they have supported the reimbursement of expenses and the provision of stipends. Rather, it is because their long-term activities have promoted real community development for the purpose of finding solutions to social problems, and they have derived a sense of pride and satisfaction from social recognition and rewards for their contributions.

• Journal of Korean Academy of Nursing Administration
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• v.7 no.1
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• pp.5-14
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• 2001

To estimate total burden of hospital admission over patient of gamily, we need to know the unofficial private expenses in addition to explicit hospital admission fees. This study was conducted from June 29, 2,000 to August 10, 2,000. Subjects were 104 patient at university hospital located at chungnam province. After thorough explanation of purpose and procedures, notebooks are given to each patient or guardian. They are requested to recorded all relevant expenditures occurred during hospital stay. Incomplete records were filled-up by direct personal contact or phones. Datas were summarized and analyzed using SAS statistical package. P-value less than 0.05 was considered significant. The results of the study are as follows: 1. In 96.1% of the patient, guardians stayed at hospital to take care of patients. In 38,8% one of the family members get work-leave or temporary resting from job. Average date of leave was 7.5days. 2. Average informal cost burden per patient was 204,467 won (14,330 won${\sim}$1,594,870 won). Average hospital cost paid by the patient was 1,061,807 won. The ratio of informal cost burden to hospital cost paid by the patient was 0.327. 3. According to the regression analysis, the relevant factors affection informal cost burdens were distance from home to hospital(p=0.018), and duration of hospitalization(p=0.0001). 4. Informal cost burden was composed of expenses for personal expense of care giver (126, 720 won/patient), meal (86,924 won/patient), transportation (77,648 won/patient), necessaries of life (18,789 won/patient), tests and treatments not covered by insurance (17,289 won/patient), medical supplies not covered by insurance (15,280 won/patient), treat for visitors (14,757 won/patient), TV coin (8,247 won/patient), and others (7,582 won/patient). In addition to the hospital cost paid by the patient for hospital admission, the informal cost burdens should be recognised explicitly because it is not small. Significant proportion of informal cost burden is composed of care-giver's personal expense, transportation, meal. It is suggested that some polices are to be devised and implemented enabling that this portion of informal expenses be directed to formal professional nursing care. Thus we can improve the quality of care and decrease discomfort of patient's relatives.