• Journal of IKEEE
• /
• v.7 no.1 s.12
• /
• pp.22-31
• /
• 2003

Conventional stimulus patterns have used DC for discrimination of acupoint and meridian which is the basic object of diagnosis and medical treatment in oriental medicine. Those discriminate conduction points by stimulation on body skin with DC. But, it is insufficient to reliability in discrimination ratio, coincident ratio, body effect, reproductivity. Therefore, this paper has extracted the optimal parameter of frequency and waveform in order to improve conventional pattern, and proposed the SPAC(Single Power Alternative Current) stimulus pattern applying that. Also, We proposes algorithm which is able to discriminate with low pressure of the electrode by displaying in the level meter both the absolution and relation value of the skin current. It can decrease pain and body effect by electrode pressure and discriminate acupoint regardless of skin current in difficult discrimination spot. We have compared the performance of system applying the extracted optimal parameter and algorithm. We have compared discrimination, coincident ratio of both conduction point and traditional acupoints by acupoint stimulation pattern. In the results, we confirmed reliability of SPAC stimulus pattern.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.405-406
• /
• 2012

A sensor network is composed of a large number of sensor nodes which have sensing, computation and wireless communication capabilities. The sensor node sends such collected data, usually via radio transmitter, to a command center (sink) either directly or through a data concentration center (a gateway). These sensor networks can be used for various application areas such as health, military, home network, managing inventory, monitoring disaster areas and so on. Moreover, owing to the rapid growth of mobile technology, high-performance smartphones are widespread and in increasing cases are utilized as a terminal device. In this paper, we propose a home management system using smartphone and sensor networks.

• Journal of the Institute of Convergence Signal Processing
• /
• v.4 no.1
• /
• pp.1-8
• /
• 2003

Various methods have been studying to maintain and apply the multimedia inform abruptly increasing over all social fields, in recent years. For retrieval of still images, we is implemented content-based image retrieval system in this paper that make possible to retrieve similar objects from image database after segmenting query object from background if user request query. Query image is processed median filtering to remove noise first and then object edge is detected it by canny edge detection. And query object is segmented from background by using convex hull. Similarity value can be obtained by means of histogram intersection with database image after securing color histogram from segmented image. Also segmented image is processed gray convert and wavelet transform to extract spacial gray distribution and texture feature. After that, Similarity value can be obtained by means of banded autocorrelogram and energy. Final similar image can be retrieved by adding upper similarity values that it make possible to not only robust in background but also better correct object retrieval by using object segmentation method.

• Journal of the Institute of Convergence Signal Processing
• /
• v.6 no.3
• /
• pp.127-133
• /
• 2005

In this paper, we propose speech interlace using VoiceXML in home network system Existing home network uses Bluetooth, IrDA, wireless LAN and Home RF but these was able to use a long distance such as outdoors or these was difficult to using method. The proposing VoiceXML speech interlace is supported with home network services more than other interface technology in a long distance also speech interlace controls home server using a wire and a wireless phone and is informed of problems to direct calling for user through VoiceXML server. In this paper, such speech interlace is able to use the aspect of home network and supports to practical remote gauge examination, remote control services. And on the basic of that, we evaluate efficiency of purposed method.

• The Journal of the Korea Contents Association
• /
• v.6 no.12
• /
• pp.169-176
• /
• 2006

Since home network system is usually set up based on the built-in system inside home at the time of construction, it has a difficulty in being compatible with new devices after construction. In this paper, we propose DBS(Dynamic Binding System) that can make links effectively among the devices located in inside and outside of home networks. Implementation of the DBS is based on the ZigBee's binding in WPAN(Wireless Personal Area Network). For this research, we constructed the system consisting of home server that contains proxy server and location server, devices inside home in which tinyOS is embedded, and mobile device that is an emulator. The communication inside home is done by IEEE 802.15.4 protocol and the communication between servers and mobile devices outside home is done by TCP/IP protocol. Regardless of device's address format, the DBS facilitates a link among the devices located inside and outside of home networks. And, introducing a new device into home network can be recognized easily by exchanging messages between devices.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.31 no.3
• /
• pp.58-64
• /
• 2003

Pogo is the instability resulting from the interaction between rocket structure and propulsion system of liquid propellant rocket. The coupling of structure and propulsion system can lead to severe problem in rocket. For the analysis of pogo, a time-invariant linearized mathematical model is developed for a selected flight time. Propulsion system is modeled using element representations for each components. Rocket structure is modeled using FEM. Form the results of modal analysis of structure, the behavior of structure can be represented. System equations for coupling structure and propulsion system are composed. The stability in obtained by the eigen solution of system matrix. The optimization of the design variables such as size, place of accumulator for suppressing pogo instability in carried out. This article of study can be used to determine the degree of stability, and guide the design of pogo suppression system.

• Korean Journal of Poultry Science
• /
• v.12 no.2
• /
• pp.75-82
• /
• 1985

This study was carried out to estimate combining abilities and heterosis in White Cornish and White Plymouth Rock. The data were obtained over an 8weeks period from 3rd Oct., 1984 to 28th Nov. 1984 at the Livestock Experiment Station. A total of 810 birds, composed of 369 pure strains, 270 two-way crosses, and 180 fourway crosses were average amount of heterosis expressed as a ratio was 1.63% for livability, 5.47% for body weight at 8 weeks, 5.57% for weight gain from day old to 8 weeks and -5.98% for feed requirement. Specific combining ability were statistically significant for all of the traits examined in this study. Although the general combining ability was not significant for any of the traits, strain A appears to be superior to other strains.

• Archives of design research
• /
• v.15 no.1
• /
• pp.203-211
• /
• 2002

The appearance of Internet, the 5th medium which has succeeded newspaper, magazine, TV, radio, creates WEB MAGAZINE to overcome the restriction of space and time. This paper has conducted the contents and visual points of view in webmagazine. Through case study, the following and identify for the analysis of the webmagazine contents and visual format. Firstly, communication at webmagazine is carried out at the user-centered atmosphere. Secondly, Even through an aesthetic is emphasized in the webmagazine, when web designer compose of the web site, it is necessary to find the proper methodology under the basis of user's behavior. Thirdly, Although webmagazine required the visual form, we should know that the evaluation of webmagazine should be implemented by users. Therefore, webmagazine should be designed by the user-centered layout.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2018.06a
• /
• pp.93.2-93.2
• /
• 2018

최근 기후 변화 문제로 $CO_2$배출량 억제 정책에 따라 열전재료가 다양한 분야에 크게 주목 받고 있다. 열전 모듈은 전류를 흘려 온도차를 발생시키는 펠티어 효과와 온도차를 전력으로 변환하는 제백 효과를 이용한다. 열전발전용에 적용되는 상용 열전모듈의 경우, 열전소자의 접합부의 수는 수십 개 이상이다. 따라서 단 한 개의 접합 불량 열전소자가 모듈 전체의 열전성능에 큰 영향을 미친다. 현재 상용화 된 Bi-Te계 열전 모듈은 Bi-Te의 Te와 Sn계 솔더의 주성분인 Sn이 $250^{\circ}C$ 부근에서 취성의 Sn-Te계 금속 화합물을 형성한다고 알려져 있다. 이 때 생성된 Sn-Te 화합물은 열전모듈의 접합강도를 약화시키고 이로 인해 열전모듈의 접합 신뢰성을 크게 저하 시킬 수 있다. 이를 해결하기 위해 솔더와 소자 사이에 확산방지층이 적용되고 있으며, 이 중에서 니켈합금이 가장 널리 적용되고 있다. 니켈층을 형성시키는 방법 중에서, 무전해 도금법은 간단하게 열전소자 표면 위에 도금 층을 균일한 두께로 만들어 낼 수 있다. 하지만, 니켈 도금층과 Bi-Te 소자 간에 화학적 결함이 존재하지 않기 때문에, 무전해 니켈 도금층의 밀착성이 떨어진다. 이 때. 소자 표면에 거칠기 효과(anchor effect)를 부여하기 위해 물리적 샌딩법을 사용하는데 이 방법의 경우 소자에 크랙 같은 손상을 미쳐 열전모듈의 신뢰성 저하를 가져온다. 그러므로 거칠기 효과를 부여하면서 소자에 손상을 최소화하는 습식 식각법을 개발하여 Bi-Te계 열전소자의 표면 조도를 조절하고 무전해 Ni-P 도금을 실시하였다. 그리고 열처리 유무에 따른 열전모듈의 접합강도를 측정하였으며, 제작한 열전 모듈의 접합부 및 파단부의 계면 분석하여 무전해 Ni-P도금을 위한 습식식각법(wet etching법)에 대하여 검토하였다. N-type은 질산과 구연산의 혼합수용액에, P-type은 왕수에 습식 식각처리를 해서 적당히 표면 조도를 조절한 후에 EPMA로 분석을 해본 결과 니켈 도금층과 Bi-Te 소자 간에 anchor effect가 부여 된 것을 확인했다. 습식 식각에 의해서 제조된 열전모듈의 접합강도는 종래의 알루미나 샌딩법으로 제조한 열전모듈 보다 높은 접합강도를 나타내었다.

• Journal of the Institute of Convergence Signal Processing
• /
• v.11 no.3
• /
• pp.203-208
• /
• 2010

In this paper, we convert underwater acoustic signal made by sonar system into digital image. We propose the algorithm that detects target candidate and emphasizes information of target introducing image processing technique for the digital image. The process detecting underwater target estimates background noise in underwater acoustic signal changing irregularly, recomposes it. and eliminates background from original image. Therefore, it generates initial target group. Also, it generates weighted map through proceeding doppler information, ensures information for target candidate through filtering using weighted map for image eliminated background noise, and decides the target candidate area in the single frame. In this paper, we verified that proposed algorithm almost had eliminated the noise generated irregularly in underwater acoustic signal made by simulation, targets had been displayed more surely in the image of underwater acoustic signal through filtering and process of target detection.