• 한국재료학회지
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• 제14권9호
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• pp.642-648
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• 2004

The microstructure and crack tip opening displacement (CTOD) of deposit weld metal were investigated for a 30 mm- thick plate welded with flux cored arc welding (FCAW) and submerged arc welding (SAW) processes. The CTOD test was carried out both as welded condition and as stress-relieved specimen by local compression. The crack growth rates in FCAW were faster than those in a SAW, and the acicular ferrite content by the SAW process was increased relatively more than that by the FCAW process. The fatigue crack growth rate in a welded specimen was faster than that in locally compressed specimen. The CTOD value of locally compressed specimens was lower than that of as welded specimen. Furthermore, the CTOD value tested with the SAW process was higher than that tested with the FCAW process.

• 한국기계가공학회지
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• 제16권1호
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• pp.30-35
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• 2017

This study is about distributions of flow in a ventilation system used in a louver for marine. In this study, to describe the flow in the ventilation opening louver, 3-dimensional steady-state turbulence was assumed to govern the equation. The flow field with pressure distribution according to the inlet velocity at the louver types is also compared. Flow analysis was performed for the louver numerical analysis on two types. The numerical analysis results in the louver blade indicated increased flow resistance at type-1.

• Journal of the Optical Society of Korea
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• 제16권2호
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• pp.95-100
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• 2012

We show that the minimum EOP (eye-opening penalty) obtained by tunable dispersion compensation is a function of a figure of merit for a nonlinear process, $I_0L_{eff}$, where $I_0$ is the optical intensity and $L_{eff}$ is the effective length of the interaction region. Using this rule, we do not need to conduct nonlinear simulations in all the cases of signal power and transmission length to obtain the signal distortion in dispersion-managed optical transmission. Instead, we need to conduct a simulation in only one case of a signal power and find the functional relation, and then we can obtain the values of the signal distortion in other cases using the discovered functional relation. This technique can reduce the number of nonlinear simulations to less than 10%.

• 소성∙가공
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• 제9권6호
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• pp.624-630
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• 2000

Typical automotive opening parts, i. e. hood trunk lid and door, are made through the press operations such as drawing, trimming, flanging, and hemming. The dimensional accuracy of stamped panels is mainly dependent on the drawing operation. However, the gap between outer panels and opening parts, which is important to the appearance quality of the assembled body, is directly influenced by the flanging and hemming operation. In this study, the relation between the design parameters of the hemming operation and the defect of roll-in is shown. The effects of some design parameters on the gap are examined using CAE. furthermore, the simulated results of the hemmed part of tailgate comer are shown and discussed.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 춘계종합학술대회
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• pp.407-410
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• 2002

미국, 독일, 영국 둥 주요 선진국에서는 시내망 경쟁활성화 및 사업자간 중복투자 방지를 위하여 가입자선로 세분화(Local Loop Unbundling: LLU)를 도입하고 있다. 광케이블 개방은 동선 가입자망의 개방과 함께 설비제공 대상의 주요 이슈가 되고 있다. 이 논문에서는 주요국의 광케이블 제공사례를 검토하여 시사점을 도출하고자 한다.

• 한국조경학회지
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• 제21권2호
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• pp.17-33
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• 1993

This paper is the on-site case study of the shaping of townscape of port towns in Korea. Inchon has been experienced the rapid urbanization after the opening of a port. Inchon is selected because of the relatively rapid process, the apparent event and influence, and the enough referneces of data about the landscape formation and transformation. As the value of historical landscape, it is very significant to study Inchon and the causes of change in townscape depend on the external element-the opening of a port, Japan colonial policy, economic progress, nationwide development. The main purpose of this study is scrutinized the process, the cause and effect, and the contents and the form of shaping of townscape. The result of the interpretation of landscape is never perfect but only a starting point. Finally this study will be applied to the pragmatic task as a basic tool which construct the desirable image of the city.

• 한국전문물리치료학회지
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• 제23권3호
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• pp.29-39
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• 2016

Background: In the treatment of temporomandibular joint (TMJ) disorder, the goals of traditional physical therapy are not only to reduce the inflammatory process leading to pain, but also to decrease joint overload and muscle hyperactivity. To achieve those goals, physical therapists generally use a photo-therapy, joint mobilization, and massage. Objects: To examine the impact of an unloading technique using non-elastic taping on the pain, opening mouth, functional level, and quality of life in patients with TMJ disorder. Method: Twenty patients with TMJ disorder were included in this study and randomly divided into the experimental ($n_1$=10), and control ($n_2$=10) groups. Traditional physical therapy including massage and stretching for 30 min was performed in both groups. Non-elastic taping was performed in the experimental group after traditional physical therapy, and they were recommended to keep the tape attached for 12 hours. Outcomes for pain, functional level, and quality of life were measured using a survey. The opening mouth was measured using a general ruler. Result: Significant differences were observed in the pain level, opening mouth, functional level, and quality of life after the intervention and on follow-up in both groups. However, we found that while the levels of all parameters were maintained throughout the follow-up period in the experimental group, the functional status level was not maintained throughout the follow-up period in the control group. Conclusion: Our unloading technique using non-elastic tape results comparable to those achieved by traditional physical therapy in the treatment of TMJ. However, the unloading taping method using non-elastic tape is more effective than traditional physical therapy in maintaining the impact of intervention.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권3호
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• pp.435-442
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• 1996

Eagle's syndrome is the term given to symtomatic elogation of the styloid process or mineralization of the stylohyoid or stylomandibular ligament. Since ossification of stylohyoid ligament at cadeva was fist described by De Manchetis in 1652 and Weinlecher described clinical symptom which produced by elongated styloid process and osteotomy of styloid process in 1872, Clinical symtom which include sensation of a foreign body on the pharynx, dysphagai, dysphonia, referred pain, and mouth opening disturbance was termed by Eagle as Eagle's syndrome. then, case reports of Eagle's syndrome are presented. in these cases, the patient's chief complaints included periauricular radiating pain, mouth opening disturbance, foreign body sensation, dysphagia, tenderness on the neck. Through vairous X-ray examination and palpation of tonsillar fossa, elongated styloid process were confirmed. Under the general anesthesia there were successfully removed out via transoral approach technique, described by Eagle. after resented styloid process, they were freed from the symptoms without further complication. Therefor we reported these cases treated by surgical resection of styloid process with good results.

• 한국터널지하공간학회 논문집
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• 제23권3호
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• pp.151-165
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• 2021

차수 및 보강을 목적으로 암반 내 수행되는 그라우팅은 여러가지 이유로 어려운 작업공정 이므로 세밀하게 수행되어야 한다. 가시적으로 확인이 불가능한 불연속면의 틈 사이로 주입되는 그라우트의 주입거동을 최적화 하면서 지반조건에 대응하는 주입방법의 도출이 필요하다. 본 연구에서는 주입압과 주입재 체적의 곱인 GIN (Grouting Intensity Number)를 보완하여 JRC에 따른 주입압의 감소 현상 및 주입압력으로 인한 절리의 열림 현상을 고려한 수정 GIN 기법을 제안하였다. 해당 방법에 대한 검증을 위하여 현장시험을 수행하였으며 지반조건에 대응하는 GIN의 산정 및 주입압과 주입양의 제어를 통해서 GIN의 한계를 준용하여 주입을 수행하였다. 그 결과 합리적인 그라우팅 작업의 수행이 가능하였으며 지반의 투수계수 또한 10^-1~10^-2 cm/sec 수준의 저감을 보였다.

• 패션비즈니스
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• 제24권1호
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• pp.60-74
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• 2020

A Podaegi is a square cloth used to carry a baby. Podaegi was an essential necessity for raising baby. However currently Koreans prefer baby-carriers, baby hip-seats, and equipments other than Podaegi. Recently, Podaegi is becoming popular around the world. Therefore, it is necessary to study Podaegi to inform Korea's traditional parenting culture product. In this research, 230 images of Podaegi were collected from paintings, photographs, postcards, films and artifacts from the late 18th century to 2000. The period of study was divided into three phases from the late Joseon Dynasty to before the opening of the port, from the opening of the port to before the liberation, and from the liberation to 2000. Types of Podaegi were categorized according to its shape and how to use. Transition process of Podaegi was examined. Podaegis were categorized into band type, blanket type, combination type, cheone type, modern type, and so on. From the late Joseon Dynasty to before the pre-openings, band type was used. From the opening of the port to liberation, all types of Podaegi appeared. Since the liberation, the use of band and blanket type has gradually decreased. Modern types have been the most popular since the 1960s. Materials of Podaegi became varied and Podaegi became a fashion-item. Later, modern Podaegi became the representative form of Korean traditional Podaegi.