• 동력기계공학회지
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• 제17권3호
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• pp.111-122
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• 2013

After the port opening in 1876, the western people made joseon image as the land of morning calm. there was a conception that joseon was a uncultivated country in the meaning of the land of morning calm. famous modernists such as gil-jun yu, kwang-su lee also had same conception. but such conception began to change in 1930's. the number of motor vehicle began to increase rapidly in 1930's. and also many of motor vehicle were equipped with air horn or electronic horn instead of bulb horn. bulb horn made thick and low rubber sound. but air horn or electronic horn made sharp and high metallic sound. city people of colonial joseon began to recognize air horn or electronic horn as city noise. so they tried to control the use of air horn or electronic horn. finally, in late 1930's, the use of air horn and electronic horn were prohibited.

• 한국공작기계학회논문집
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• 제17권6호
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• pp.63-70
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• 2008

Conical horn is used in many high frequency ultrasonic horns, to achieve a longitudinal vibration mode across a wide ultrasonic tool horn output surface. Modal analysis is method for designing tuned ultrasonic tool horn and for the prediction natural frequency of ultrasonic tool horn vibration mode. The design of ultrasonic horn is based on prototype estimate obtained by FEM analysis. The FEM simulated ultrasonic tool horn is built and characterized experimentally through laser vibrometer and electrical impedance analysis. In this paper, FEM analysis is developed to predict the natural frequency of ultrasonic tool horn and use of in the optimal design of ultrasonic horn shape.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.513-518
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• 2013

The purpose of vehicle horn sound is for warning to pedestrians. In the past, the main development factor is to match the regulation level. But nowadays perceived quality is more important than level itself. In this study, we measure variety horn sound and evaluate its signals through the jury evaluation aimed at making horn sound quality index. Each contribution of the noise path for sound quality is identified and the target values and methods for implementing the luxurious horn sound are suggested. Finally, we developed, horn component and improve horn mounting condition for luxurious horn sound.

• 대한전자공학회논문지
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• 제25권12호
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• pp.1573-1581
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• 1988

In this paper, the analysis on the dual mode conical horn antennas is made to realize the optimum horn as the primary feed of the offset parabolic antenna for the domestic broadcasting satellite. Such analysis can give rise to the approximate equations and graphs on the beam width, which makes it possible to design the desired conical horn. It has been shown that the radiation charateristics of designed horn antenna built with the dielectric band inside the horn. The designed dual mode horn antenna may provide the useful basis to practical usage of the antenna in the domestic satellite broadcasting communication systems.

• 한국기계가공학회지
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• 제12권5호
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• pp.135-140
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• 2013

Ultrasonic cutting is a kind of eco-technique and cost-effective technique to be used for cutting of various materials such as baked product, fresh/frozen food, rubber, textile, wood, bone, etc. The performance of ultrasonic cutting is affected by design of cutting horn and cutting conditions. Specially the design of horn to resonate at the longitudinal direction is most important. To analyze the problems from which cracking and noise are often generated with conventional cutting horn, FEA is carried out, and then improved cutting horn which can reduce maximum stress and stress concentration is designed. Vibration characteristics, resonant frequency, gain, and amplitude uniformity of the cutting horn designed optimally are evaluated through FFT analysis and compared with those of conventional cutting horn.

• Journal of Welding and Joining
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• 제27권4호
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• pp.60-66
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• 2009

The cylinder horn is designed to increase uniformity of the displacement on the output face through simulation and experiments for the simple cylinder, spool and step horns. The modal analysis is conducted numerically to calculate the vibration mode and stress distribution of the cylinder horn, and the design of experiment (DOE) technique is employed to determine the optimum configuration of the spool horn. Displacement of the cylinder horn was measured using the Laser Doppler Vibrometer (LDV), and experimental results show good agreements with the predicted results. It appears that uniformity higher than 95% can be achieved with the spool horn when the proper dimension of the groove is used.

• Archives of Plastic Surgery
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• 제32권5호
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• pp.645-648
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• 2005

Cutaneous horn is a morphologic designation for a projectile, conical, dense hyperkeratotic nodule that resembles the horn of an animal. The lesion varies in size from only a few millimeters to several centimeters, in color(white or yellowish) and in form (straight, curved, or twisted). It arises from a wide range of epidermal lesions, which include benign lesions, premalignant lesions and malignant lesions. An 83-year-old women came to our clinic with a giant cutaneous horn on the right chin and a small horn on the left upper eyelid. The patient had no palpable cervical lymph node. A wide elliptical skin incision was made and the horn was totally excised. In pathology, the giant cutaneous horn on the right chin revealed a moderately differentiated squamous cell carcinoma with subcutis invasion at its base. "Giant cutaneous horns" have often been associated with invasive squamous cell carcinoma. Cutaneous horns are common lesions usually found on the face, rarely larger than 2 cm. As large cutaneous horns are often associated with underlying malignancy, histopathologic examination of the base of the lesion is necessary to rule out carcinoma and full excision is recommended.

• 한국소음진동공학회논문집
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• 제24권7호
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• pp.537-548
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• 2014

In this paper, horn loudspeaker modeling was suggested, investigated and verified through comparison of test results and simulation ones based on input electrical impedance curves and acoustic sensitivity ones. First, Thiele Small parameters of horn driver were identified by using pseudo loudspeaker model concept and verified in case of both closed and open horndriver. Second, cone-shaped horn models were investigated and compared with input acoustic impedance curves for real horn(cone angle $6.6^{\circ}$) and short horn(cone angle $27.9^{\circ}$). It showed that Leach model for cone horn was well described to test results, which were electrical impedance and acoustic sensitivity, compared to Lemaitre one. To represent horn system model good approximation in wide frequency range, mass correction filter and lowpass filter were adopted and consequently showed good fitted to test results.

• 한국정보통신학회논문지
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• 제9권4호
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• pp.816-823
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• 2005

비혼(non-Horn) 논리 프로그램은 혼(Horn) 논리 프로그램을 1계 술어 논리(1st order predicate logic) 수준으로 확장하였기 때문에 표현력은 크지만 효율적으로 구현된 사례가 없어서 실용적인 언어로 사용되지는 못하였다. 지금까지 연구된 효율적인 방법은 비혼 논리 프로그램을 증명절차 InH-Prolog의 의미를 이용하여 동등한 혼 논리 프로그램으로 변환한 후 변환된 혼 논리 프로그램을 WAM(Warren Abstract Machine) 명령어로 컴파일하여 수행시키는 방법이다. 본 논문에서는 이 방법을 향상시키기 위하여 비혼 논리 프로그램을 효율적으로 수행하는 EWAM(Extended WAM)과 비혼 논리 프로그램을 EWAM 명령어로 컴파일하는 방법을 제안한다. 또한 본 논문에서는 제안한 EWAM의 에뮬레이터 및 컴파일러를 구현하여 그 성능을 측정하였다. 본 논문에서 구현한 EWAM 에뮬레이터 및 컴파일러의 성능을 측정한 결과 기존 방법보다 매우 효율적임을 확인하였다.

• 약학회지
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• 제43권4호
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• pp.411-418
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• 1999

Intracerebroventricular (ICV) infusion of morphine (MOR) produces strong analgesia in man and animals. The analgesic effect is thought to be mediated by the centrifugal inhibitory control. But neural mechanisms of the analgesic effect of ICV morphine are not well understood. In the present study, we found that ICV MOR had dual actions on the activity of dorsal horn heurons: it produced both inhibition and excitation of dorsal horn neurons. Since MOR exerts its action via three different types of opioid receptors, we further sought to investigate if there are differential effects of opioid receptor agonists on dorsal horn neurons when administered intracerebroventricularly. Effects of ICV MOR were tested in 28 dorsal horn neurons of the spinal cord in the cat. ICV MOR inhibited, excited and did not affect the heat responses of dorsal horn neurons. ICV DAMGO and DADLE, $\mu$- and $\delta$-opioid agonist, respectively, exhibited the excitation of dorsal horn neurons. In contract, U-50488, a k-opioid agonist, exhibited both the inhibition and excitation of dorsal horn neurons. These results suggest that opioid receptors have different actions on activity of dorsal horn neuron and that the inhibitory action of k-opioid agonist may subserve the analgesia often produced by ICV MOR.