• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.11
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• pp.2505-2511
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• 2013

Many studies in detection and classification of the targets in the underwater environments have been conducted for military purposes, as well as for non-military purpose. Due to the complicated characteristics of underwater acoustic signal reflecting multipath environments and spatio-temporal varying characteristics, active sonar target classification technique has been considered as a difficult technique. And it has difficulties in collecting actual underwater data. In this paper, we synthesized active target echoes based on ray tracing algorithm using target model having 3-dimensional highlight distribution. Then, Fractional Fourier transform was applied to synthesized target echoes to extract feature vector. Recognition experiment was performed using neural network classifier.

• Journal of Korean Medical classics
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• v.28 no.3
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• pp.45-65
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• 2015

Objectives : Holsaye, the doctor responsible for the King's health, explained about ways to comfort body and mind and not get diseases for long life ("Yangsaeng") and about food in Eumsunjungyp which was a dietary cure book compiled and published in the Yuan Dynasty. This study examined about what the definition of Yangsaeng, introduced by a doctor from a different country, and the characteristics of the ways in treating the sick with Yangsaeng and food in the Yuan dynasty. Methods : This study used Eumsunjungyo from the China Chinese Medicine Publisher as its method. It analyzed the organization and the characteristics of the contents of Eumsunjungyo, and compared with Korea's first dietary cure book Singnyochanyo("食療纂要"). Results : Eumsunjungyo is a dietary cure book written by a doctor in the Yuan Dynasty. It suggested different ways of Yangsaeng according to specific patients and purposes, and explained the importance of food. Singnyochanyo is a dietary cure book written by a doctor in the Joseon Dynasty. It suggested ways to cure each of categorized diseases using foods. Conclusions : Eumsunjungyo is a dietary cure book written in 1330 to which the unique food culture of the people in other countries applied. Singnyochanyo written in 1460 is a kind of dietary cure book as well, but it categorized foods for each disease and revealed characteristics as an emergency care. However, Eumsunjungyo stressed health management through Yangsaeng and foods throughout the whole life.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.42.2-42.2
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• 2011

Noise generated from wind turbines has been predicted by numerical methods. Sound pressure level(SPL) on the turbines is predicted after aerodynamic analysis is carried out by Wind Turbine Flow, Aeroacoustics and Structure analysis (WINFAS) code. The level of each panel of acoustic sphere is determined by the sum of tonal, turbulence ingestion and airfoil self noise. With the noise source database, the acoustic sphere, SPL on the ground is calculated using the model based on acoustic ray theory. The model has been designed to consider the effects on the condition of terrain and atmosphere. The variations of SPL on the ground occur not only because of the different source level but also because of the nonuniform distributions of the sound speed along the height. Hence, the profile of an effective sound speed which is the sum of the contribution of sound speed to a temperature gradient and a wind speed variation is used by the theory based on atmospheric stability. With the integrated numerical method, the prediction of sound propagation on the wind farm is carried out with the states of the atmospheric stability.

• Journal of Korean Medical classics
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• v.28 no.4
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• pp.155-177
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• 2015

Objectives : This study examined the food cures in Eumsunjungyo Singnyojaebyeong. The diseases described in Singnyojaebyeong still occur frequently in modern times. This study also investigated the recipe of food cures for applying to the modern time treatment. Methods : I categorized the major symptoms of the sixty-one food therapies in Singnyojaebyeong, and sorted the main ingredients of each symptoms, and organized the efficacies of food sources based on third book of Eumsunjungyo. Results : Singnyojaebyeong, which organized the treatment methods curing diseases with foods, provided information about the foods that are good for twenty diseases, such as Heoro, Shinheo, Pung, Yotong, Heoyak, Biwui Heoyak, Seupbi, Sujong, Sogal, Sobyeonbultong, Gakgi, and Chijil. The food therapy methods were used to cure diseases using the food sources suitable for each major symptom. Conclusions : The food therapies in Eumsunjungyo Singnyojaebyeong proves that people in all regions have used food to cure diseases from old times. And to cure diseases, people have used the characteristics, tastes, and cooking forms of food ingredients for a long time. Thus, this study can be a reference for creating another food therapy.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.519-522
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• 2002

컴퓨터에 의한 실내음향 예측에 있어 확산반사의 고려는 매우 중요한 요소의 하나로 간주된다. 지난 수년 동안 음선추적법을 이용하여 실내음향을 예측하는 경우에 확산 반사를 고려하기 위한 방안들이 다양하게 제시되었으나 경면반사를 근본으로 하는 영상법에서는 확산 반사를 고려하기가 어려운 것으로 알려져 있다. 본 연구에서는 컴퓨터 그래픽 분야에서 제안된 확장 라디오 시티법을 적용하여 영상법에서 확산반사를 고려하는 방안을 제시하였다. 부분적으로 확산성을 갖는 반사면에서의 음향에너지 반사는 확산반사와 경면반사의 형태로 나누어 볼 수 있으며 반사의 횟수를 거듭함에 따라 확산-확산, 확산-경면, 경면-확산, 경면-경면의 형태로 반사에너지의 전환이 이루어진다. 본 연구에서는 고차 형태계수의 개념을 이용하여 이 네가지 형태의 반사음전달과정을 모두 고려할 수 있도록 함으로써 실내의 벽면을 부분적 확산반사의 특성을 갖는 반사면으로 모델링 할 수 있도록 하였다. 본 논문에서는 확장라디오시티법의 개념과 이에 따른 고차형태계수의 근사 계산법을 제시하고 고차형태계수가 실내음향 씨뮬레이션의 결과에 미치는 영향 등을 분석해 보았다. [본 연구는 한국과학재단 특정기초 연구 (과제번호 1999-1-310-004-3)의 지원에 의한 연구결과의 일부임]

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.487-490
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• 2002

학교 교육의 특성상 많은 부분이 교실에서의 음성정보 전달에 의해 이루어지고 있는 점을 감안하면 바람직한 청취환경의 개선이 검토되어야 한다. 또한 중${\cdot}$ 고등학교의 수학능력시험의 국어, 영어 듣기평가 및 다양한 어학 시험이 시청각 시설을 통해 이루어지고 있는 실정이므로 교실의 음환경은 매우 중요한 요소라하겠다. 본 논문에서는 음환경을 좌우하는 음원의 위치에 따라 명료 도가 어떻게 달라지는지를 실험을 통하여 검증하고, 명료도가 높고, 교실 전체에 균등한 분포를 보이는 음원의 위치를 찾아내고자 하였다. 교실 내의 음원의 위치로는 일반적으로 많이 쓰이고 있는 column(벽면 노출형)과 ceiling(천정 매입형) 위치와 임의의 음원 cluster(전면 중앙)를 선정하여 음장 파라메터를 측정한 결과 RASTI 는 세 타입 모두 $0.54\~0.55$로 값으로 근소한 차이를 보이고 있으며, 잔향시간은 ceiling>cluster>column의 순서로 나타났다. 일반적으로 잔향과 명료도와의 관계는 반비례하는 것으로 알려져 있으나, 실험 결과 잔향시간이 1.33초로 가장 긴 column 스피커의 경우 D50 값이 약 $47\%$로 가장 높은 값으로 나타났다. 이것은 column형 스피커의 경우 음원과 각 학생의 위치에 대한 평균 직접음선거리가 가장 짧기 때문인 것으로 나타났다.

• The KIPS Transactions:PartB
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• v.11B no.1
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• pp.7-12
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• 2004

This thesis studies about thinning compensation and the removal of pseudo minutiae using ridge trace. As for the process of thinning compensation, first, it removes unnecessary pixel when 8-neighbor connection sum among the pixels with the crossing count number 6 is not 3. Second, it deals with repeatedly until there is no pixel to remove while tracing the ridge, beginning with the pixel equivalent to the ridge and the pixel with the crossing count number 2 among the 8 pixels around the pixels with the crossing count number 6. When the thinning compensation is finished, it extracts substitute minutiae to use the crossing count number and the 8-neighbor connection sum. Among the extracted substitute minutiaes, it extracts the real minutiae to utilize the pseudo minutiae removal algorithm again. It compares with the existing method for the performance evaluation of proposal method. By the experimental results, The proposal method indicated that a degree of thinning is excellent and a lot of minutiaes were removed.

• The Journal of the Acoustical Society of Korea
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• v.22 no.1
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• pp.7-13
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• 2003

Numerous investigations have demonstrated that diffused reflection is one of the most important factors in predicting room acoustics by computer simulation. Recent studies have suggested several computational algorithms in order to account for diffused reflections in the ray tracing or beam tracing method. In this study, a computational algorithm for the calculation of diffuse sound reflections in the image method is suggested and a computer simulation system is developed based on the suggested algorithm. The methodology adopted in our computer simulation system is similar to the extended radiosity method, which is developed for the computer graphics. In a real room, sound energy is reflected in a partially diffused manner which results in four reflection combinations: diffuse-diffuse, specular-specular, diffuse-specular and specular-diffuse. In this study, higher order form factor is introduced to handle the four types of reflection combinations so that the partially diffused reflection could be modeled. In this paper, the concept of extended radiosity method is described and the approximate method of calculating higher order form factor is suggested. Finally, the effect of higher order form factors on the simulation of reverberation time is investigated.

• The Journal of the Acoustical Society of Korea
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• v.35 no.4
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• pp.243-252
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• 2016

In this paper, the incoherent reverberation model based on coupled normal mode method is presented. In the range dependent environment, one way coupled normal mode method is used to calculate the pressure from a source to a scatterer patch and the pressure from a scatterer patch to a receiver. For the computational efficiency, the sound propagation from a source/receiver to the scatterer patch is assumed to occur only in the 2D plane where a source/receiver and scatterer patch are located. For the model verification, problems of the reverberation modeling workshop I and II sponsored by the US office of Naval Research are calculated and the results are compared with the incoherent reverberation model results based on the ray method.

• Journal of Korean Medical classics
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• v.29 no.3
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• pp.41-56
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• 2016

Objectives : The paper analyzes food cure recipes related to wind diseases as written in Sikuisimgam, Eumsunjungyo Shikyojaebyeong, and Singnyochanyo. The paper shall then use results of the analysis to consider food cure recipes utilized by patients who are suffering from wind diseases or who are showing symptoms of wind diseases. The paper aims to help cure modern diseases related to wind diseases and make a set of suggestion about preventive foods. Methods : Important dietary guidebooks in Korea and China were studied, and the author studied only the ones among the food cure recipes that had wind diseases for which they are effective. Sikuisimgam 16 species, Eumsunjungyo Shikyojaebyeong 13 species, Singnyochanyo 13 species of food cure recipes related to wind diseases were extracted, and they were studied based on their ingredients, cooking style, and administration time. Results : There are food ingredients introduced as effective for curing wind diseases within Sikuisimgam, Eumsunjungyo Shikyojaebyeong, and Singnyochanyo. Among them, some of the ones that can be utilized in the modern age are: arrowroot(葛粉), nepta herb(荊芥), Baekryangmi(白粱米), Dongmaja(冬麻子), milled rice(白米), Eokiin(薏苡人), fermented soybean, chongbaek, Wubanggeun(牛蒡根), soy beans(大豆), grass(椒), xanthium fruit(蒼耳子), changi leaves(蒼耳葉), jinpi(陳皮), black pepper(胡椒), ginger(生薑), mint leaves(薄荷葉), suyu, heukjima(黑脂麻), ojagye, chives, and Baekyuma(白油麻). Conclusions : The food ingredients extracted from Sikuisimgam, Eumsunjungyo Shikyojaebyeong, and Singnyochanyo are effective in curing wind diseases, and they should be processed in ways that enable the people of this age to consume more of them. Moreover, people who have not yet suffered from wind diseases but are showing the symptoms of wind diseases will benefit from taking care of their blood pressure by consuming these foods in their everyday lives. Such people will serve as examples of good food cure recipes.