• Advances in aircraft and spacecraft science
• /
• 제4권5호
• /
• pp.585-611
• /
• 2017

This article covenants with the post buckling witticism of carbon nanotube reinforced composite (CNTRC) beam supported with an elastic foundation in thermal atmospheres with arbitrary assumed random system properties. The arbitrary assumed random system properties are be modeled as uncorrelated Gaussian random input variables. Unvaryingly distributed (UD) and functionally graded (FG) distributions of the carbon nanotube are deliberated. The material belongings of CNTRC beam are presumed to be graded in the beam depth way and appraised through a micromechanical exemplary. The basic equations of a CNTRC beam are imitative constructed on a higher order shear deformation beam (HSDT) theory with von-Karman type nonlinearity. The beam is supported by two parameters Pasternak elastic foundation with Winkler cubic nonlinearity. The thermal dominance is involved in the material properties of CNTRC beam is foreseen to be temperature dependent (TD). The first and second order perturbation method (SOPT) and Monte Carlo sampling (MCS) by way of CO nonlinear finite element method (FEM) through direct iterative way are offered to observe the mean, coefficient of variation (COV) and probability distribution function (PDF) of critical post buckling load. Archetypal outcomes are presented for the volume fraction of CNTRC, slenderness ratios, boundary conditions, underpinning parameters, amplitude ratios, temperature reliant and sovereign random material properties with arbitrary system properties. The present defined tactic is corroborated with the results available in the literature and by employing MCS.

• 대한인간공학회지
• /
• 제34권2호
• /
• pp.135-143
• /
• 2015

Objective: The purposes of this study are to investigate ergonomic problems and to propose their improving measures in office environment of big general hospitals. Background: Office tasks have varying risk factors of work-related musculoskeletal disorders (WMSDs). The first symptom resulted from the office work was recognized as an occupational disease in Korea in 1986. Although the symptoms have increased since its first recognition, there has been few study on the effect of office work environment settings. Method: First, the author took pictures of working scenes performed in three big university hospitals. Next, the pictures were analyzed in view point of ergonomics. Based on the analysis, their improving measures were proposed for reducing work stress. Results: The results showed that most physical office environment settings such as dimensions of tables/desks and chairs, leg room, thigh, knee and foot clearances, and chairs used did not satisfy the ergonomically recommended design guidelines. In addition, some clerks placed personal belongings under their desks, put monitors in high position and did not lean against the backrest of chairs in seated tasks, which resulted in poor working postures of leg, back, neck etc. It is recommended that the hospital management should provide their clerks with ergonomically designed office furniture and continuously perform ergonomics training program for raising clerks' recognition for office ergonomics. Conclusion: Most office environment settings investigated in this study were not in good condition in view point of ergonomic design for the settings. Application: It would be useful as basic data for establishing ergonomically good office environment in hospitals.

• 아동학회지
• /
• 제13권2호
• /
• pp.99-112
• /
• 1992

The purpose of the present study was to investigate methodological and theoretical problems in measuring the acquisition of national identity of in-country and over-seas Korean adolescents. The subjects consisted of 344 in-country and 89 over-seas (total 433) adolescents. 14 to 26 years of age. Data were collected with the use of two questionnaires. The Cognition of National Characteristics(CNC) and The Measure of National Belongings(MNB). As statistical measures. F-test and Pearson's correlation coefficient were used. The results are disclosed as follows; 1) The concept of national identity organized not only cognition of the national characteristics in multi-dimension which is related each other, but also a sense of belonging. 2) Two measuring methods(CNC and MNB) for this study are closely related. 3) Overseas Korean adolescents performed more than in-country Korean adolescents in 5 sub-national characteristics(language, social norm, history of the nation, & breaking with ideological thinking) except the consanguinity, of CNC and MNB. Crisis hypothesis was supposed as alternative factor to explain that overseas Korean adolescents cognified about the national characteristics and feel a sense of belonging more than the in-country respondents. 4) Some demographic variables, such as age of the respondents, place of birth, level of understanding Korean language, are contributed to acquiring national identity.

• 교육시설 논문지
• /
• 제23권6호
• /
• pp.19-26
• /
• 2016

In this study, moving awareness of students having different physical conditions in homebase and attitudes of students to spacial use in user's aspect were analyzed. As shown in the results, the dissatisfaction degree of the second grade using homebase type was higher than the first and the third grades using exclusive space for a class, homeroom type. The necessity of exclusive space for a class was highly shown in the second grade students. Students of the first and the third grades showed similar pattern in using frequency of homeroom. The results showed that behavior pattern of students was different with their physical conditions. Especially, factors showing obvious differences between the two groups were possession awareness of their belongings, tendency to route choice of high frequency, stay awareness of main stay in time to rest and point of time using restroom. These results will be useful to design various models in variation type of schools.

• 한국학교ㆍ지역보건교육학회지
• /
• 제12권1호
• /
• pp.71-89
• /
• 2011

Objectives: The purpose of this study is to identify risk behavior related to the school accident between male and female elementary school students. Methods: 838 School accident data provided by Seoul School Safety Council were analyzed by gender. Based on the results above, survey questionnaires on characteristics of school accident were developed. Self-reported data were collected from a sample population of 433 students in grade 5 to 6 students attending 4 elementary schools in Seoul. Results: The students who answered they experienced the accident in school for the past 1 year, accounts 60.5% of male and 39.5% of females students, which has statistically significant difference. The male's cases happened most around corridor/door, while female's cases happened most in the playground/gymnasium. As for the accident risk behavior, male students had the risk behavior by using the personal belongings/toys, while the female students had much risk behavior related to physical facility/playground. When classifying the characteristics of risk behaviors according to the accident causes, male students showed higher score in the accident risk behaviors related to play/fight than in those of the female students(p<0.05). Conclusions: Health care providers should develop school safety programs by characteristics of risk behavior between male and female elementary school students.

• 대한수의학회지
• /
• 제61권3호
• /
• pp.26.1-26.8
• /
• 2021

Acinetobacter is a bacteria found in the environment and clinical specimens, causing nosocomial infection and antimicrobial resistance (AMR) threats. This study examined the prevalence, species, and AMR characteristics of Acinetobacter isolated from surgical practice and the laboratory dog husbandry room environments (n = 235) at Rajamangala University of Technology Tawan-ok veterinary hospital during 2018-2019. The prevalence of Acinetobacter in the laboratory dog husbandry room and veterinary belongings were 2.55% and 0.43%, respectively. Species determination was Acinetobacter hemolyticus (2.13%) and Acinetobacter baumannii (0.43%) from environments in the laboratory dog husbandry room, and Acinetobacter junii (0.43%) from the shoes used in the surgical practice room. AMR was observed in both study environments and the specimens sent to the Veterinary Diagnostic Center. These isolates had a high resistant percentage to amoxicillin-clavulanic acid (84.62%), sulfamethoxazole-trimethoprim (61.54%), and cephalexin (53.85%) but were susceptible to imipenem. Compared to the isolates recovered from the clinical specimens, most isolates derived from environments exhibited multidrug resistance and shared correlated resistance patterns. These results highlight the need for sanitization in the dog husbandry room. Furthermore, the AMR results can be used as a preliminary baseline for studying AMR Acinetobacter contamination in animals and their environments.

• 산업경영시스템학회지
• /
• 제45권4호
• /
• pp.240-246
• /
• 2022

This paper introduces a container loading problem and proposes a theoretical approach that efficiently solves it. The problem is to determine a proper weight of products loaded on a container that is delivered by third party logistics (3PL) providers. When the company pre-loads products into a container, typically one or two days in advance of its delivery date, various truck weights of 3PL providers and unpredictability of the randomness make it difficult for the company to meet the total weight regulation. Such a randomness is mainly due to physical difference of trucks, fuel level, and personalized equipment/belongings, etc. This paper provides a theoretical methodology that uses historical shipping data to deal with the randomness. The problem is formulated as a stochastic optimization where the truck randomness is reflected by a theoretical distribution. The data analytics solution of the problem is derived, which can be easily applied in practice. Experiments using practical data reveal that the suggested approach results in a significant cost reduction, compared to a simple average heuristic method. This study provides new aspects of the container loading problem and the efficient solving approach, which can be widely applied in diverse industries using 3PL providers.

• 한국식생활문화학회지
• /
• 제21권4호
• /
• pp.406-413
• /
• 2006

This study investigated legal environments on customers' experiences of accidential losses in a restaurant service. A wide review of the cases showed that restaurant customers' experiences of accidential losses are classified into 11 types as follows; loss of personal belongings with posted warning, loss of personal longings without posted warning, injuries in a restaurant with posted warning, injuries in a restaurant without posted warning, injuries while eating, food poisoning, injuries from defective tablewares, allergic reactions, illegal or unsanitary food supplies, and false labeling of countries of origin. The results of this exploratory study revealed that the respondents had experienced some out of those 11 incidents in average 2.6 times in all of their restaurant visits, and the incidents frequently happened in independent restaurants rather than in fast-food establishments, family restaurants, or hotel restaurants. The results also showed that the accidents from illegal or unsanitary food supplies was happened most frequently and false labeling of countries of origin was mostly anticipated increasing in the future.

• 복식
• /
• 제66권6호
• /
• pp.32-45
• /
• 2016

The purpose of this study is to propose changes that can be made to improve nurse uniforms in terms of outfit and functionality based on actual wearing conditions and nurse's preference. The proposed nurse uniform was composed of a blouse and pants. The design was as follows: the blouse had short set-in sleeve with China collar, a princess line, and it came down to middle hip. Armhole action pleats and back inverted pleats were embedded for convenient arm movements. The pants waist had a rubber band at the back waist, and the crotch length and the knee width were increased for activity. To make the pocket more accommodative, separate pocket slots treated with silicone were added to prevent belongings from coming out of the pocket. The pink tone of the uniforms, as well as the stripes on the blouses and spandex incorporated pants were based on nurses' preference. the nurse uniforms were produced after measuring the size of women in the age of 25 to 29, and the uniform patterns were corrected after two wearing experiments. Wearing test was examined in terms of appearance and functionality. For appearance, experts gave the uniforms a mean rating of 4.30, and nurses gave a mean rating of 4.00. Functionality was evaluated in terms of ease of activity and storage aspects. The total mean of ease of activity in nursing service was 4.30, whereas the evaluation of storage in terms of pocket position and convenience was 3.80.

• 한국항행학회논문지
• /
• 제21권6호
• /
• pp.620-625
• /
• 2017

최근 사람이 다수 붐비는 지역에 스마트 폰이나, 태블릿 등을 바로 충전할 수 있는 태양광 모듈이 설치되어 서비스를 제공하고 있다. 하지만 버스 출입과 관련된 정보의 연동이 불가능 하여 충전 중인 스마트 폰이나, 태블릿 등을 두고 버스에 승차하여 분실하는 문제가 발생한다. 본 논문에서는 이와 같은 문제를 해결하기 위해 LPWA 기술과 BLE의 Advertising mode를 이용하여 버스가 접근 할 때 스마트폰으로 알려주는 시스템을 제안한다. 실험결과 NLOS에서 낮은 위치에 존재하는 수신 단말과 버스에 장착된 단말간 통신거리가 최대 640 m인 것을 확인하였으며 이를 통해 약 2~3분 전에 버스의 도착 알람을 받을 수 있는 것을 확인하였으며, Ble의 서비스 거리가 최대 87 m로 버스 정류장 인근에 있어도 서비스를 제공받을 수 있는 것을 확인하였다.