• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.5 no.1
• /
• pp.212-221
• /
• 2001

This paper deals with the design techniques for underwater acoustic basin. An underwater acoustic basin is needed for test and calibration of acoustic sensors, acoustic digital communication system, acoustic measurement system, and underwater image data telemetry system. KRISO(Korea Research Institute of Ships and Ocean Engineering) have planned the construction of an underwater acoustic tank from 1999 to 2001 through internal project. We studied about absorbtion characteristics of a porous re-cycled rubber which is selected as a absorption materials and designed absorption plate with wedge shape. The simulation of reflection analysis along the wedge angle for wedged type plate was presented.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2000.05a
• /
• pp.371-377
• /
• 2000

This paper deals with the design techniques for underwater acoustic basin. An underwater acoustic basin is needed for test and calibration of acoustic sensors, acoustic digital communication system, acoustic measurement system, and underwater image data telemetry system. KRISO(Korea Research Institute of Ships and Ocean Engineering) have planned the construction of an underwater acoustic tank from 1999 to 2001 through internal project. We studied about absorbtion characteristics of a porous re-cycled rubber which is selected as a absorption materials and designed absorption plate with wedge shape. The simulation of reflection analysis along the wedge angle for wedged type plate was presented.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2001.11a
• /
• pp.859-863
• /
• 2001

자바는 썬 마이크로 시스템사가 1999년 6월에 플랫폼이나 개발 성격에 따라서 3가지 Edition으로 나누었다. Java 1.1 버전까지는 일반적인 자바 Applet이나 Application의 개발이 목적이였다. 그러나 Java 1.2 버전 이상에서는 자바의 용도가 좀 더 다양해지고 자바가 올라갈 수 있는 플랫폼이 다양해져 그 특성에 맞는 자바가 등장하게 되었다. 본 연구는 모바일 단말기용 Java VM 플랫폼 중 PVM 플렛폼을 연구하는 데에 기초로 한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2007.06a
• /
• pp.155-156
• /
• 2007

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2014.10a
• /
• pp.341-343
• /
• 2014

3D 지리정보 통합 플렛폼을 활용하여 해양교통시설 정보 및 이를 운영하기 위한 다양한 부가정보(기상, 낙뢰, 지진, AIS 등)를 매쉬업하여 표출함으로서 해양교통시설을 효과적으로 운영관리하고 이를 활용하여 서비스 이용자 접근성을 보다 표리하게 제공할 수 있는 방안을 제시하고자 한다.

• Communications of the Korean Institute of Information Scientists and Engineers
• /
• v.18 no.10
• /
• pp.27-34
• /
• 2000

간단하게나마 XHTML을 이용한 데이터 방송에 관련된 기술표준과 이를 이용한 데이터 방송 시스템의 한 예를 소개하였다. 데이터 방송은 아직 그 형태나 가능성이 개발되어 가는 과정에 있으며 여기에 소개된 기술표준도 계속 빠른 속도로 발전되어 가고 있다. W3C에서는 XHTML 1.1을 기초로 프로파일, 확장 폼, 확장 이벤트 등을 정의하고 있으며 CSS3, DOM3도 작업이 진행 중이다. 미국과 유럽의 표준화 위원회에서는 선언적 어플리케이션을 규격에 포함시키는 작업이 한창이다. 이런 추세로 보아 앞으로의 데이터 방송은 공개된 표준 기술을 수용하는 쪽으로 발전하게 될 것이며 그 한 축은 본 원고에서 다룬 내용이 자리 잡게 될 것이라고 예상된다.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.34 no.3
• /
• pp.307-313
• /
• 2010

In this study, alternative designs for the bends used in district heating pipes are investigated. The district heating pipes, which are subjected to temperatures of 10 to $120^{\circ}C$ and a water pressure of $16\;kgf/cm^2$, have to withstand thermomechanical cyclic loads when in use. These pipes comprise three concentric tubes: a steel pipe (internal), polyurethane (PUR) insulator (middle), and a high-density polyethylene (HDPE) case (external). In addition, the bends in the district heating pipe system are covered with foam pads that cause aging. In this study, an alternative bend design that does not involve the use of a foam pad is proposed to overcome the aging problem in the bends. In the proposed design, "shear rings" are added to the surface of a bend, and its dimensions are determined by a combination of the statistical (Taguchi) method and FEM. The geometrical parameters such as thickness, height, and number of the rings significantly affect the design optimization, and hence, they affect the results of the FEM.

• Journal of Korea Entertainment Industry Association
• /
• v.15 no.7
• /
• pp.271-280
• /
• 2021

The purpose of this study was to conduct a subjective and objective evaluation to verify the improvements in acne skin conditions followed by the use of foam cleanser, skin toner, and a facial pack that contains bamboo vinegar. The research targets are 20 male and female high school students in Gwangju and Jeolla regions with acne skin of grade II and above based on the Korean Acne Grading System (KAGS). For the experiment, the subjects were classified between an experimental group with 10 subjects who used bamboo vinegar foam cleanser, skin toner, and facial pack and a control group with 10 subjects who used foam cleanser, skin toner, and facial pack without bamboo vinegar, and the subjects had to use the foam cleanser, skin toner, and facial pack for 12 weeks. In the case of skin improvement effects founded upon the objective measurement values, the experimental group showed a greater improvement for reducing the pores in the forehead, nose ridge, and left cheek (p<.001) compared to the control group, and the experiment group had higher satisfaction overall even for the skin improvement effects based on the subjective evaluation tool (p<.05, p<.001). The overall values of the satisfaction of the cosmetics showed that the experiment group had higher values (p<.01, p<.001) compared to the control group for the foam cleanser, skin toner, and facial pack, and there were statistically significant differences for usability in details (p<.01, p<.001). In conclusion, it was proven that bamboo vinegar is an effective natural cosmetic product material to improve acne skin conditions.

• Applied Chemistry for Engineering
• /
• v.34 no.6
• /
• pp.603-607
• /
• 2023

Aqueous film forming foam (AFFF) is a critical fire suppression agent used in combating hydrocarbon fires. This type of fire suppressant is highly effective due to its ability to form a protective film, dissipate heat, inhibit combustion, and utilize a blend of chemical substances to extinguish fires. While these properties offer significant advantages in responding to hydrocarbon fires, AFFF is distinct in its deployment as it is dispensed in the form of foam. Therefore, the rheological analysis of AFFF foam using a rheometer plays a crucial role in predicting the spray characteristics of AFFF for combating hydrocarbon fires, and this is closely associated with effective fire suppression. In this study, we conducted rheometer experiments to confirm the non-Newtonian behavior (shear-thinning) of AFFF foam and obtained data on the form's stability. These experimental data are expected to contribute to enhancing the efficiency of fire suppression systems utilizing AFFF.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2004.05a
• /
• pp.233-236
• /
• 2004

컴포넌트 기반 소프트웨어 설계는 개발된 컴포넌트의 조립을 통한 재사용으로 소프트웨어를 생성하는 것을 목표로 하고 있다. 이때 재사용되는 컴포넌트들은 용도에 맞게 개조되어야 한다. 본 연구는 이러한 개조 방법을 트랜잭션 어뎁터(Transaction Adaptor)라는 개조 컴포넌트를 이용하여 기존의 컴포넌트 또는 기존의 레거시 시스템을 재사용하는 것에 대한 연구이다. TA를 이용한 개조방법은 클라이언트와 호스트시스템 사이에 TA컴포넌트를 사용하여, XML데이터를 스트림 형태로 변환하여 전송함으로서 레거시 시스템을 재사용한다. 이러한 TA를 이용한 재사용 방법은 클라이언트 플렛폼이나 호스트의 종류에 관계없이 TA가 XML로 데이터 변환처리하여 레거시 시스템을 재사용할 수 있다.