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류기열(Ryu Ki Yeol),이정태(Lee Jung Tae),변광준(Byeon Kwnag June) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.1
As an application software in distributed computing environment becomes large, the number of objects to be created increases drastically and the interfaces among them become very complex. The concept of group object resolves this problem to some extent by grouping a set of related objects, encapsulating them, and controlling their interfaces systematically. In this paper, we propose an implementation model of the group object concept in CORBA, which is a standard middleware for developing distributed application software on heterogeneous networks. To support group objects, we extends CORBA ORB without modifying its internal structure for the compatibility with existing CORBA applications. And we devise an interface definition language by extending CORBA IDL to describe group objects in a language-independent style, which is one of the most important characteristics in CORBA. Finally, we experiment the implementation model on a CORBA ORB compliant product which supports the Java language.
수치해석을 통한 대형 선박용 프로펠러의 비공동소음 예측
유기완(Ki-Wahn Ryu),이종열(Jong-Yeol Lee),김봉기(Bong-Ki Kim),변정우(Jeong-Woo Byun) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.2
Noises from the large scale marine propeller are calculated numerically on non-cavitation condition. The hydrodynamic analysis is carried out by potential based panel method with time marching free wake approach. The distribution of hydrodynamic loads on the propeller surface and noise signals are obtained using the unsteady Bernoullis equation and the Farasssats formula respectively. It turns out that the noise signal at the narrow band shows strong peak at the blade passage frequency, and the peak value at the 1/3 octave band also shows the same trend. Noise signals and directivity patterns for both the thickness and the loading noise are compared with each other. The directivity pattern for the loading noise shows minor lobe at the backward side of the rotating disc plane.
Si-Hwan Ryu,Ki-Jin Park,Jong-Yeol Park,Young-Ho Seo,Jae-Keun Choi,Woo-Sik Yong,Sang-Min Lee,Jang-Yong Lee,Kyung-Hee Kim 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Maize breeding is mainly divided by two steps; line development and hybrid selection. Line development is very important procedure to make good hybrids and this line development in Korea is fully depend upon conventional methods like pedigree selection, back-cross, etc. For development of pure line, we have to do self-pollination for at least seven cycles. This line development system is tedious, labor-intensive, and time-consuming procedure. Doubled Haploid technology for maize is a new system to develop inbred lines within short period and many maize research institutes in foreign advanced countries have been actively using this technology. Using Doubled Haploid technology, we can greatly reduce the period of line development and strengthen maize research ability in Korea. Key requisite for Doubled Haploid breeding is possession of inducer lines which can produce haploid when source population is crossed with them. Maize Research Institute in Gangwon Province secures the right of using inducer lines and is trying to introduce Doubled Haploid breeding in Korea. Doubled Haploid breeding system is as follows; crossing between population and inducer, separation haploid seeds from F1 seeds, chromosome doubling, doubled plant management, self-pollination, seed multiplication, and assessment. We expect our breeding capacity will be progressed by introduction of Doubled Haploid technology. When this technology comes to combine with marker assisted selection, we can increase competitiveness against global institutes.
Development of field corn varieties for adaptation of Primorsky Krai in Russia
Si-Hwan Ryu,Ki-Jin Park,Jong-Yeol Park,Eun-Ha Jang,Young-Ho Seo,Woo-Sik Yong,Sang-Min Lee,Kyung-Hee Kim 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
We are importing corn grains more than eight million tons every year, and self-sufficiency rate of corn is less than one percent. It is not easy to increase field corn production in Korea because of limited arable land. For this reason, many companies have been interesting overseas agriculture for corn production. But they don’t have enough suitable variety for the target area. Our objective is to develop field corn varieties for adaptation in Primorsky Krai which is the southeasternmost region of Russia. This project has been collaborated with Dr. Huk-Ha Lee in Seoul National Univ. and planted three times in Primorsky Krai since 2011. Planting materials for this project were developed in Maize Research Institute. 74 hybrids in 2011, 76 in 2012, and 80 in 2013 were planted for regional performance test. Primorsky Krai is a colder area and has less frost-free days than Korea. Several hybrids have shown good performance, but lots of materials developed in Korea could not fully ripened in 2011 because of late planting and early frost. In 2012, we mainly selected early flowering materials as well as picked materials from first year. The silking date of our materials was later than local commercial varieties, but some our hybrids had good characteristics and high yield. Among them, we picked two hybrids and planted them in Ussuriysk in Primorsky Krai for field demonstration test. We expect some of the selected hybrids can be candidate varieties for improvement of corn production at overseas agricultural production base.
A New Black Waxy Corn Hybrid Cultivar, "Miheugchal" with Good Eating Quality and High Yield
Ki Jin Park,Si Hwan Ryu,Hwang Kee Min,Jeong Sik Seo,Jong Yeol Park,Byeong Dae Goh,Jin Sun Jang,Nam Soo Kim 한국육종학회 2007 한국육종학회지 Vol.39 No.1
A new single cross waxy corn (Zea mays L.) hybrid, “Miheugchal” with black kernel was developed by the Maize Experiment Station (MES), Gangwon-do Agricultural Research and Extension Services (GARES) in 2004. This hybrid, which has good eating quality and
柳然國,崔承烈,朴英基 충주대학교 산업대학원 2001 大學院論文輯 Vol.2 No.-
In this paper, bandstop filters have been designed by microstrip line which relative permittivity(ε_r) 2.5, thickness(h) is 0.7874[㎜]. In procedure, filter have been designed with parallel stub which has been physically simply implemented, butterworth and chebyshev type have been used with commensurate line which length of all stubs at center frequency is λ/8. On designing, Richard transformation and Kuroda identities have been used. And characteristic impedance of each section calculated, in result width and length of each section calculated. The center frequency of the filter is 3[㎓] and bandwidth is 50%, and simulated with the values of width and length of each section. Also, measured values of filter compared with simulation results. In the case of butterworth, center frequency was shifted about 0.22[㎓], bandwidth was 1.82[㎓], in the case of chebyshev, center frequency was shifted 0.2[㎓], bandwidth was 1.58[㎓]. Frequency response the chebyshev type is more sharper than butterworth type, and theoretical values of the filters are agreed with the measured values.
Thoracic Intramedullary Schwannoma Accompanying by Extramedullary Beads-Like Daughter Schwanommas
Ryu, Kyeong-Sik,Lee, Ki-Yeol,Lee, Hong-Jae,Park, Chun-Kun The Korean Neurosurgical Society 2011 Journal of Korean neurosurgical society Vol.49 No.5
Thoracic intramedullary schwannomas are rare spinal cord tumors. Most of these tumors have been reported as a single lesion in the spinal cord. The authors report the first case of intramedullary schwannoma accompanying by extramedullary beads-like daughter masses of the thoracic spine. A 68-year-old male presented with walking disturbance and decreased sensation below T10 dermatome. Imaging workup revealed an intramedullary mass at T6 and T7, T6 and T7 laminectomy and mass removal were performed. Intraoperatively, extramedullary beads-like daughter masses along the nerve roots adjacent to intramedullary mass were identified. Total removal of intramedullary lesion and partial resection of extramedullary masses were done. Histological analysis confirmed the diagnosis of schwannoma. The patient could ambulate independently at postoperative 1 month without any neurological sequelae. The authors experienced a surgical case of intramedullary schwannoma accompanying by extramedullary beads-like same pathologies in the thoracic spine.
Autonomic Neural Regulation of Sodium Transporters and Water Channels in Rat Submandibular Gland
Ryu, Sun-Yeol,Jung, Hyun,Kim, Ki-Yung,Kim, Mi-Won,Lee, Jong-Un The Korean Society of Pharmacology 2006 The Korean Journal of Physiology & Pharmacology Vol.10 No.2
The present study was undertaken to explore the role of autonomic nerves in the regulation of sodium transporters and water channels in the salivary gland. Rats were denervated of their sympathetic or parasympathetic nerves to the submandibular gland. One week later, the expression of Na,K-ATPase, epithelial sodium channels (ENaC), and aquaporins (AQP) was examined in the denervated and contralateral glands. The sympathetic denervation slightly but significantly decreased the expression of ${\alpha}1$ subunit of Na,K-ATPase, whereas the parasympathetic denervation increased it. The expression of ${\alpha}$-subunit of ENaC was significantly increased in both the denervated and contralateral glands either by the sympathetic or parasympathetic denervation. The sympathetic denervation significantly increased the expression of AQP5 in both the denervated and contralateral glands, whereas the parasympathetic denervation decreased it. It is suggested that the autonomic nerves have a tonic effect on the regulation of sodium transporters and AQP water channels in the salivary gland.