• Special Issue of the Society of Naval Architects of Korea
• /
• 2011.09a
• /
• pp.63-69
• /
• 2011

Exhaust gases of a vessel from a main engine, a diesel generator and an incinerator contain very harmful substances like soot, $SO_2$ and NOx. Careful design of funnel shape is required to prevent those harmful exhaust gases from influencing on accommodation and a fan room. Meanwhile, the exhaust gases are also hot enough to damage electronic devices like radar. Therefore the funnel design should be considered so that electronic devices are not directly exposed to the exhaust gas in the strong stern wind. This study may propose guidelines of optimum design criterion for the anti-thermal damage design of the electronic devices and anti-recirculating design of harmful exhaust gas near the accommodation. From CFD analyses, we can understand that the major factors affecting the exhaust gas dispersion are the large scale mixing by separation vortices and the sluggish flow in the recirculation region. We hope that the funnel flow analysis around ship's funnel is used for practical optimum funnel design to minimize the exhaust gas dispersion by adjusting the funnel shape, the position of the exhaust pipe, the shape of bulwark, the exhaust direction of air ventilated an engine room and the angle of the exhaust pipe.

• Journal of Chest Surgery
• /
• v.19 no.4
• /
• pp.707-714
• /
• 1986

Funnel chest is the most common deformity of the sternum. It is characterized by a funnel shaped depression of the sternum with sharp angulation and lengthening of the costal cartilages, with the result that the cartilages point posteriorly. We have experienced with eight cases of funnel chest for 2 years recently, and they were corrected by the method of Ravitch operation with or without Kirschner`s wire. The postoperative course was uneventful. And now we report these with literature review.

• Journal of Chest Surgery
• /
• v.16 no.2
• /
• pp.226-230
• /
• 1983

Two patients with funnel chest deformity were corrected at the Department of Thoracic Surgery of Chungnam National University Hospital . The first case was 11 year old boy, suffering from exertional dyspnea with asymmetrical funnel chest deformity, of which hollow cavity was measured 80 ml of water. The second case was 6 year old boy, suffering from frequent upper respiratory tract infection with symmetrical funnel chest deformity, of which hollow cavity was measured 50 ml of water. These two cases were corrected by Ravitch method, left lower lobectomy was performed concurrently on the first case. The result was satisfactory.

• Journal of Chest Surgery
• /
• v.1 no.1
• /
• pp.31-36
• /
• 1968

A case of funnel chest associated with von-Recklinghousen`s disease of the skin who was treated surgically under the method of sternoturn-over at the 63rd Army Hospital, Republic of Korea Army, is presented with review of the literature.

• Journal of Chest Surgery
• /
• v.7 no.2
• /
• pp.153-162
• /
• 1974

Four patients with funnel chest deformity corrected in the Department of Thoracic Surgery, Seoul National University Hospital are presented. The first case was a 21-year old female with cyanosis, clubbed fingers and systolic murmur on the left infrascapular region on physical examination associated with agenesis of the right lung. The deformity was of asymmetrical funnel chest, in which the left hemithorax was more sunken. She was corrected by the method of Funnel Costoplasty of Wada. The second case was a three years old boy whose anterior chest wall was symmetrically deformed, and he was corrected by the method of Ravitch using Adkins strut under the sternum. The third was a 22-year old man with symmetrical deformity, and was corrected by the method described by Shannon in 1973. The last patient was a 22-year old man and he had dyspnea on exertion, palpitation and apical systolic murmur with symmetrical funnel chest deformity. He was also corrected by Ravitch operation, All of them has excellent result.

• Nuclear Engineering and Technology
• /
• v.52 no.8
• /
• pp.1724-1731
• /
• 2020

Low cycle fatigue tests on the hydrogenated welding seam of Zr-Sn-Nb alloy at room temperature and 360 ℃ had been carried out by using the funnel-shaped flat specimens. The relationships between nominal stress & strain directly measured across the funnel and local stress & strain at the root of the funnel are given by considering cyclic plasticity correction. The results show that the fatigue resistance of welding seam at room temperature is only slightly better than that at 360 ℃. Probabilistic fatigue life curves are obtained by using a two-parameter power function.

• Korean journal of applied entomology
• /
• v.32 no.1
• /
• pp.76-82
• /
• 1993

Phonotaxis of the African mole cricket, Gryllotalpa africana palisot de Beauvois, was investigated in 1990 and 1992 at the agronomy Experiment Station of Korea Ginseng & Tobacco Research Institute in Hwaseong-gun, Kyonggi-do, Male adults produced calling sounds (calling songs) through the openings of subsurface burrows. Intensities of the sound were 77-80 dB at 15 cm above the openings. When tape recordings of male calling songs were broadcasted outdoors at 105-110 dB by two horn speakers installed at the center of a 1.4 m diameter-funnel, flying adults were attracted for 1.5 hours from about 30 minutes after sunset. Among attracted adults, 14.3-16.9% landed in the funnel, and 65.7-74.7% landed on the ground within 2m form the sound source. Females were 66.7-74.3%, which seemed to be due to the sex ratio of the population in the field. Adults landing in the funnel and at the distance of within 2m from the center of the funnel were tend to be a little more than those attracted to a blacklight trap.

• Journal of the Korean Ceramic Society
• /
• v.35 no.11
• /
• pp.1155-1161
• /
• 1998

We have studyed the surface electric resistiance for inner conductive film consisted of graphite and iron oxide by coating the conductive paint on inner face of 28" wide CRT funnel and have evaluated the working properties of 28" wide CRT according to the surface electric resistiance. We found that the viscosity of paint and the thickness of conductive film became the higher but the surface electric resistiance of con-ductive films was the lower than before in accordance with the increase of solid contents in conductive paint and that the surface condition and the surface electric resistiance of conductive films changed highly ac-cording to the drying conditions also. From these results we could get the uniform thickness and the un-iform film resistance and the optimum working property of selectric propertise in CRT when we used the conductive paint with solid contents 28% and viscosity about 13cps.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.34 no.1
• /
• pp.6-12
• /
• 1998

The moving behaviour of Yellowtail Seriola quinqueradiata schools in the main-net of a large scale set-net was investigated in relation to the catching function of the funnel-net by a scanning sonar. The investigation was took place in the Kishihata set-net fishing ground located in Nanao city Ishigawa prefecture, Japan from Nov. 9 to Nov. 13, 1992. The obtained results are summarized as follows; 1. Fish schools showed the greatest number at the playground in the morning and at the bag-net in the afternoon. The fish schools remained long time in the main-net. 2. The rate of fish school through the funnel-net was smaller than that of fish school which is though the playground and bag-net. Because the Yellowtail school changed the shape of school in passing the funnel-net. 3. The rate of entering the bag-net was 24%, among the fish school heading to the outer funnel-net. But, the rate of escaping to the playground was 27%, among the fish school heading to the inner funnel-net. It seems that the structure of the outer funnel-net was not enough to lead the fish to the bag-net. However, the structure of the inner funnel-net was very effective at preventing escape. 4. It is appropriate to haul the net in the morning in considering the number of accumulated fish in the bag-net during the survey.

• Proceedings of the Korean Society of Radiological Science
• /
• 1994.10a
• /
• pp.99.2-100
• /
• 1994