• Elastomers and Composites
• /
• v.55 no.2
• /
• pp.88-94
• /
• 2020

Automobile industry, along with the automobile steering system, is rapidly changing and developing. The constant velocity joint transmits power to the wheels of vehicles without changing their angular velocity based on the movement of the steering wheel. Moreover, it controls their movement to act as a buffer. In order to prevent the excessive increase in temperature caused by the movement of vehicles, boots are attached to the constant velocity joint and lubricant is injected into the boots. The boots maintain the lubrication and protect the constant velocity joint from sand, water, and so on. As the wheels of the vehicle rotate, the boots are acted upon by forces such as bending, compression, and tension. Additionally, self-contact occurs to boots. Therefore, their durability deteriorates over time. To prevent this problem, polychloroprene rubber was initially used however, it was replaced by thermoplastic polyester elastomers due to their excellent fatigue durability. In this study, the structural analysis of boots was conducted. The results showed the deformation patterns of the boots based on the translation and rotation of the constant velocity joint. Moreover, it confirmed the location that was vulnerable to deformation. This study can be used to potentially design high-quality constant velocity joint boots.

• Journal of the Korean Applied Science and Technology
• /
• v.35 no.1
• /
• pp.89-98
• /
• 2018

The purpose of this study was to compare the foot plantar pressure and temperature changes of the developed combat boots with functional impact absorption and ventilation insole. A total of 11 male subjects(age: $21.8{\pm}2.2yrs$, height: $174.3{\pm}3.6cm$, weight: $71.6{\pm}8.6kg$, foot length: $261.0{\pm}1.0mm$) were recruited to compare the foot plantar pressure and temperature changes of the three types of combat boots: Combat boots A (generalized combat boots), Combat boots B (developed combat boots with ventilation function), Combat boots C (Application of ventilation function and impact absorption insole to combat boots B). Pedar-X and a portable thermistor temperature sensor were used to measure the foot plantar pressure parameters and the internal temperature of the combat boots, respectively. One-way ANOVA was used to compare the results of plantar pressure and temperature changes. The results were as follows: First, in the foot plantar pressure parameters, combat boots C showed the significant lower maximum foot plantar pressure in the right/left rear foot compared with combat boots A and average foot plantar pressure in the left foot compared with combat boots B. Second, after 40 minutes from the start of walking, the developed combat boots B and C showed the significant lower temperature than the general combat boots A.

• The Journal of the Convergence on Culture Technology
• /
• v.4 no.1
• /
• pp.237-240
• /
• 2018

Recently, many parts including military uniform and combat boots have been changed into functional ones in company with the development of military supplies. Especially, problems such as crack of soles and defective boots regarding combat boots have been improved, which is the motive of this study. As a result of verifying other theses, the study on the satisfaction of combat boots is not existent. The contents of study are the pressure of combat boots, the analysis on the shoelace of combat boots as the instrument for suicide and they are not interesting, which is the reason to become a subject of this study.

• Journal of the Korean Society of Costume
• /
• v.56 no.1 s.100
• /
• pp.44-55
• /
• 2006

The purpose of this study is to examine the characteristics of man's boots in the Joseon Dynasty and compared them with those of the Ming and Qing Dynasty to find the influential relationships between them. Boots in the Joseon Dynasty are divided into several kinds such as Heukgwejapihwa, Hheuksapihwa(黑斜皮靴), Heukpihwa(黑皮靴), Mokhwa(木靴), Hyeopgeumhwa(挾金靴), Suhwaja (水靴子), Jeonpihwa, Gijahwa(起子靴), and Baekhwa(白靴). In addition, Jeong(精: footwear) was put inside boots. They tend to be named according to their materials or ornaments on them. First, Jeong put inside the boots is regarded as footwear for the comfort of the feet or protection against cold. Mokhwa appears in literature around the 19th century. As shown by remains and paintings of those days, it is considered to have become the common name of boots as it underwent many changes. On the other hand, a book in the era of King Gojong includes pictures of Suhwaja. Compared to Hukpihwa in the same book. The topside seems to have been raised in order to make the wearer who put on a military uniform feel comfortable when walking, since the bottom piece is hard. Baekhwa is worn not only with funeral garments but also with Sibok(時服), one of official uniforms. Boots in the Joseon Dynasty had been made following the design of the Ming Dynasty since official uniforms were conferred upon King Gongmin in the late Koryo Dynasty. But turning the late Joseon Dynasty its detailed design changed little by little. The topside of the boots became more round, the entrance part became wider, height of the shoes became taller, and the bottom piece became parallel to the ground.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.32 no.2
• /
• pp.271-283
• /
• 2008

The purpose of this study is to provide information on how to improving wearing sensation and fit of boots-cut jean through analysis of the actual wearing conditions and dissatisfaction. In order to compile the information about dissatisfaction with the appropriateness of the fit of boots-cut jean, a questionnaire was administered to 150 females(between the ages of 20 and 39) living in Gwang-ju, analyzed using the SPSS WIN 12.0 program. Also, 6 blue jean manufactures were investigated, the study method was a interview about company present status, sizing system and pattern of boots-cut jean. The result of this study were as follow: 1. In wearing conditions, the 20's(51.6%) to 30's(69.1%) is found the best preferred jean is boots-cut style. The reason why consumers prefer boots-cut jeans with wearing fit does to seem charming bodyline of the adult female. 2. Body type groups by drop was classified with the usual waist, the thick waist, the thin waist. The differences among age groups, body type and so on were compared using the chi-square test. Dissatisfaction of the fit of the thick waist and the thin waist was higher than the usual waist. 3. Research on the production sizing system of 6 blue jean brands showed the total sizing system of each manufacture were $3{\sim}9$, they were reflected the sizing system of the korean Industrial Standards(KS K 0051). Therefore, it is considered necessary for boots-cut jeans pattern and sizing system for Korean consumer's body shape.

• Proceedings of KOSOMES biannual meeting
• /
• 2005.11a
• /
• pp.111-124
• /
• 2005

Small vessels of less then 20 tonnage and leisure boots such as motor boots, sailing yachts, water motorcycle, etc have been excluded from the rules and regulations such as Marine Leisure Safety Act, Ship Act and Ship Safety Act for a long time in Korea As a result, these small vessels and leisure boots have remained within the blind area of maritime safety and environment protection Among these vessels and boots, some leisure boots such as motor boots of 20 horse power or more(excluding motor boots equipped with engine inside the vehicles), water motorcycles and robber boots of 30 horse power or more are incorporated into the Marine Leisure Safety Act through the registry, safety inspection, insurance early 2005 in Korea In relation to the scope of application of the national Acts concerned, I consider the conflicts between Acts and suggest the subordinate enforcement ordinance and regulations.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.15 no.6
• /
• pp.83-88
• /
• 2016

Over the last five years, 568 people have died while hiking according to 2015 statistics from the public safety ministry. Among those deaths, approximately 33% were due to loss of footing or falling. In this respect, the highly advanced functions of hiking boots should be considered to prevent these unfortunate accidents. For example, by utilizing the Internet of Things (IoT) and Information and Communications Technology (ICT), hiking boots equipped with a Global Positioning System (GPS) or vital signs monitoring systems should be considered. In addition, many challenges remain for the production of 3D printed hiking boots, because the functions of hiking boots are variable, which is important when handling changing terrains and situations. The design of customized hiking boots was introduced in this paper, and 3D printing applications for midsoles using a Porous Polymer Printing (PPP) method was also suggested to verify the possibility of manufacturing hiking boots.

• Journal of International Academy of Physical Therapy Research
• /
• v.11 no.4
• /
• pp.2221-2228
• /
• 2020

Background: Shoes cover the feet and ankle joints and come into contact with the ground directly during walking, and the shape of shoes is related to the muscle tone of the lower extremity muscles. However, no study has been conducted on the muscle tone of the lower extremity after wearing combat boots. Objectives: To compare and analyze the effects of walking in combat boots and in athletic shoes on muscle tone and stiffness, to identifying the effect of the characteristics of shoes on the muscle tone. Design: Randomized controlled trial. Methods: Thirty subjects were randomly divided into a combat boots group and an athletic shoes group, and interventions were implemented. Both groups walked for 30 minutes on a treadmill at 4.2 km/h. MyotonPRO was used to measure the muscle tone and stiffness of the lower extremity. The measuring sites were set to five muscles on both legs. Results: In the combat boots group, muscle tone and stiffness of the medial gastrocnemius on the dominant side, the muscle tone and stiffness of rectus femoris, and the muscle stiffness of hamstring on the non-dominant side significantly decreased after walking. In the athletic shoes group, there was no significant change in the muscle tone and stiffness. Conclusion: The results of this study can be used to inform the wearing combat boots while walking on a treadmill reduces the muscle tone and stiffness of the lower extremity compared to athletic shoes. It indicates that the restriction of joint movement occurring when wearing combat boots influences reducing muscle tone and stiffness.

• Journal of the military operations research society of Korea
• /
• v.12 no.2
• /
• pp.56-67
• /
• 1986

This paper is concerned with a standard size system and production proportion of combat boots. For the standard size system foot sizes of 327 soldiers were mesured by Martin type anthropometric equipment. 24 foot measurements were obtained on all individuals. The standard size system of which key measurements are foot length and joint girth are proposed on the basis of the statistically treated measurement data. The production (or purchasing) proportion of the proposed size system of combat boots are also proposed.

• Review of Korea Contents Association
• /
• v.16 no.3
• /
• pp.25-41
• /
• 2018