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다결정을 이용한 실온에서의 분광 홀버닝 광메모리 구현에 관한 연구
조재헌,백운식,장기완 경희대학교 레이저공학연구소 2001 레이저공학 Vol.12 No.-
The extremely high data densities can be obtained by spectral holeburning, so persistent holeburning has been studied on crystal that doped sm2+ ions at room temperature. To improve performance of persistent spectral holeburning system, we replace a dye laser system by our Littman type external cavity tunable laser diode system.
Track Topology Based Reliable In-Network Aggregation Scheduling in Wireless Sensor Networks
BAEK, Jang Woon,KWON, Kee-Koo,LEE, Su-In,SEO, Dae-Wha 'Institute of Electronics, Information and Communi 2014 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.eb97 No.11
<P>This paper proposes a reliable data aggregation scheduling that uses caching and re-transmission based on track topology. In the proposed scheme, a node detects packet losses by overhearing messages that includes error indications of the child nodes, from its neighbor nodes. If packet losses are detected, as a backup parent, the node retransmits the lost packet. A retransmission strategy is added into the adaptive timeout scheduling scheme, which adaptively configures both the timeout and the collection period according to the potential level of an event occurrence. The retransmission steps cause an additional delay and power consumption of the sensor nodes, but dramatically increase the data accuracy of the aggregation results. An extensive simulation under various workloads shows that the proposed scheme outperforms other schemes in terms of data accuracy and energy consumption.</P>
Independent Inheritance between cgy1 gene and y9 gene in soybean
Woon-Jang Baek,Sung-Mi Kyung,Min-Hwan Kim,Myung-Sik Kim,Jong-Il Chung 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Soybean [Glycine max (L.) Merr.] proteins are widely used for human and animal feed in the world. Glycinin (11S globulin) and β-conglycinin (7S globulin) account for storage protein from 70% to 80% in soybean seed. 7S globulin protein exhibits poorer nutritional and food processing properties. β-conglycinin is composed of α’, α, and β-subunits. α′-subunit of 7S globulin are main antinutritional factors in soybean seed. The absence of α′-subunit were controlled by single recessive alleles, cgy1. Leaf chlorophyll-deficient mutants controlled by y9 locus have been observed frequently and are useful in genetic studies in soybean. So far, 19 single recessive gene yellow leaf mutants and one duplicate recessive gene mutant have been described. The y9 type found in T135 is yellow at emergence, becoming greenish-yellow by maturity. The objective of this research was to confirm the linkage or independent assortment between cgy1 gene and y9 gene. The F1 seeds from C-142 (α′-subunit of 7S globulin present, leaf chlorophyll -deficient: Cgy1Cgy1y9y9 genotype) x PI line (α′-subunit of 7S globulin absent, normal leaf type: cgy1cgy1Y9Y9 genotype) were obtained. F1 seeds obtained were planted in a greenhouse and F1 hybridity was checked on morphological traits. All F2 seeds were planted at field in May 2012. Leaf chlorophyll-deficient trait of F2 individual plants will be recorded at growth stage from field. Presence and absence of α′-subunit of 7S globulin protein will be checked by SDS-PAGE based on each F₂single plant. Chi-square analysis was used to test the goodness-of-fit of observed ratios with expected ratios for independent assortment or linkage.
Experimental study on the hybrid shear connection using headed studs and steel plates
Jang-Woon Baek,Hyeon-Keun Yang,Hong-Gun Park,Tae-Sung Eom,Hyeon-Jong Hwang 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.37 No.6
Although several types of rigid shear connectors have been developed particularly to increase load-carrying capacity, application is limited due to the complicated details of such connection. In this study, push-out tests were performed for specimens with hybrid shear connectors using headed studs and shear plates to identify the effects of each parameter on the structural performance of such shear connection. The test parameters included steel ratios of headed stud to shear plate, connection length, and embedded depth of shear plates. The peak strength and residual strength were estimated using various shear transfer mechanisms such as stud shear, concrete bearing, and shear friction. The hybrid shear connectors using shear plates and headed studs showed large load-carrying capacity and deformation capacity. The peak strength was predicted by the concrete bearing strength of the shear plates. The residual strength was sufficiently predicted by the stud shear strength of headed studs or by shear friction strength of dowel reinforcing bars. Further, the finite element analysis was performed to verify the shear transfer mechanism of the connection with hybrid shear connector.
Independent Inheritance between ti gene and y9 gene in soybean
Woon-Jang Baek,Sung-Mi Kyung,Min-Hwan Kim,Myung-Sik Kim,Jong-Il Chung 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Leaf chlorophyll-deficient mutants controlled by y9 locus have been observed frequently and are useful in genetic studies in soybean. So far, 19 single recessive gene yellow leaf mutants and one duplicate recessive gene mutant have been described. The y9 type found in T135 is yellow at emergence, becoming greenish-yellow by maturity. Soybean Kunitz trypsin inhibitor protein has been proposed as one of the major antinutritional factor. The absence of Kunitz trypsin inhibitor protein in mature seed is inherited as a recessive allele designated ti. The objective of this research was to confirm independent inheritance between ti gene and y9 gene. The F1 seeds from Gaechuck#1 (Kunitz trypsin inhibitor protein absent, normal leaf type) x C-142 (Kunitz trypsin inhibitor protein present, leaf chlorophyll -deficient) were obtained. F1 seeds obtained were planted in a greenhouse and F1 hybridity was checked on morphological traits. All F2 seeds were planted at field in May 2012. Leaf chlorophyll-deficient trait of F2 individual plants will be recorded at growth stage from field. Presence and absence of Kunitz trypsin inhibitor protein will be checked by SDS-PAGE based on each F₂single plant. Chi-square analysis was used to test the goodness-of-fit of observed ratios with expected ratios for independent assortment or linkage.
Baek, Jang-Woon,Park, Hong-Gun,Shin, Hyun-Mock,Yim, Sang-Jun American Concrete Institute 2017 ACI structural journal Vol.114 No.3
<P>In shear design of massive walls in nuclear power plants, the use of high-strength reinforcing bars is necessary to enhance the constructability and economy. In the present study, walls with an aspect ratio of 2.0 were tested under cyclic lateral loading to investigate the effect of 550 MPa (80 ksi) bars on shear strength of slender walls. The test parameters were shear reinforcement grade, shear reinforcement ratio, and failure mode. Most test specimens failed due to diagonal tension cracking. The ratios of the test shear strength to ACI 349 prediction (that is, safety margins) were 1.48 to 1.83 and 1.18 to 1.46 for general and seismic provisions, respectively. The test results of walls with 550 MPa (80 ksi) bars were similar to those of walls with 420 MPa (60 ksi) bars: failure mode, safety margin, and average crack width. The test results and failure modes were confirmed by nonlinear finite element analysis results.</P>
BAEK, Jang Woon,NAM, Young Jin,SEO, Dae-Wha The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.2
<P>Wireless sensor networks are subject to node and link failures for a variety of reasons. This paper proposes a <I>k</I>-disjoint-path routing algorithm that varies the number of disjoint paths (<I>k</I>) in order to meet a target-delivery ratio of critical events and to reduce energy consumption. The proposed algorithm sends packets to the base station through a single path without the occurrence of critical events, however, it sends packets to the base station through <I>k</I> disjoint paths (<I>k</I> > 1) under the occurrence of critical events, where <I>k</I> is computed from a well-defined fault model. The proposed algorithm detects the occurrence of critical events by monitoring collected data patterns. The simulation results reveal that the proposed algorithm is more resilient to random node failure and patterned failure than other routing algorithms, and it also decreases energy consumption much more than the multi-path and path-repair algorithms.</P>