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Sharing of an endosymbiont in sap-feeding insects with the emphasis of Lycorma delicatula
Gilsang Jeong,Eunjoo Choi,Jaeha Ahn,Yikweon Jang,Hansu Choi 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10
evolution of multicellular organisms. Especially in insects, a large amount of bacterial symbionts are illustrated. Among the insect taxonomic group, sap feeding insects, mostly Heteroptera, that feeds on poor nutrient sources from plants, have developed special organs where symbiotic bacteria can reside. The bacteria mainly provide the host insects with some essential amino acids. This has built evolutionarily unbreakable tie between the symbionts and the their hosts. Here we present an obligate symbiont from Lycorma delicatula (Heteroptera: Fulgoridae) being thought to invade the Korean penninsula recently. Based on the partial 16s rRNA gene sequence, the symbiotic bacterium is identified as Cadidatus Sulcia mullleri. The Genbank data indicates that the bacterium is found in various heteropteran families. This may imply the acquisition of the bacterium precedes the hosts' divergence, though there is an alternative postulation. We discuss its distribution in the sap-feeding insects and potential role on survival of L. delicatula and paratransgenetic application of the bacterium in controlling L. delicatula.
다양한 조명 환경에서의 6DoF 자세 추정 성능 향상을 위한 가상 학습 데이터셋 생성 방법
장길상(Gilsang Jang),손문구(Moongu Son),윤준상(Junsang Yun),오인영(Inyoung Oh),송진호(Jinho Song),고광희(Kwanghee Ko) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
객체의 자세 추정 네트워크의 발전으로 인해 RGB 이미지만으로도 자세를 추론하는 연구들이 발표되었지만, 여전히 인공지능 학습을 위한 6DoF 데이터셋을 획득하는 것은 제한적이다. 또한, 이미지 기반의 추론 특성상 데이터 획득 환경에서의 조명 조건에 따라 탐지 및 추정 결과에 영향을 끼친다는 단점이 있다. 본 논문에서는 이와 같은 단점을 극복하기 위해 CAD모델을 사용하여 자세 추정 네트워크의 학습 데이터를 가상으로 생성하고 HDR 이미지 기반 렌더링을 통해 다양한 광원 조건을 적용하는 방식으로 여러 가지 조명 환경에서의 딥러닝 네트워크 탐지 성능을 향상시켰다. With the development of object pose estimation network, some studies have been published to infer object pose only with RGB images, but it still has limitations that obtaining 6DoF datasets for training artificial intelligence. Also, due to the characteristics of image-based inference, there is a disadvantage that it is affected its detection and inference results by lighting conditions in the data acquisition environment. To overcome these advantages, this paper proposes a method using CAD model to virtually generate training data of pose estimation network and applying various lighting conditions using HDR image-based rendering. The proposed method improves the performance of deep learning network for detection in various lighting environments.
Eunae Ko,Yikweon Jang,Gilsang Jeong 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
Haplodiploid sex determination occurs in a wide range of animals, especially in Hymenoptera, where a fertilized egg develops into a diploid female and unfertilized into a haploid male. However, recent studies on diploid functional males in some wasps suggest that the simple addition of paternal gene by fertilization may not be enough to explain female offspring production in the sex determination system. Recently, activation of sex determination gene (tra) was found to have a pivotal role in determining the sex of Nasonia vitripennis. In N. vitripennis, tra is activated only on the paternal genome (i.e. sperm) not on the maternal counterpart (i.e. egg). Such parent specific activation of a gene is controlled by a epigenetic factor, DNA methylation. However, in Trichogramma kaykai, Wolbachia induces female offspring production without sperm. Therefore all female offspring are clonal to the maternal gene. This violates the role of activated sex determination gene (tra) from sperm in the wasp. We hypothesize that Wolbachia has an ability to activate the gene by demethylation. This hypothesis indicates that the target of sex ratio distorting endosymbionts may be an upstream gene. It will enhance our understanding of evolution of haplodiploid sex determination.
Hwakyung Hwang,Yikweon Jang,Gilsang Jeong 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
The α-proteobacterium Wolbachia pipientis infects a wide range of arthropods and filarial nematodes. Wolbachia is maternally inherited and is known to induce reproductive anomalies such as cytoplasmic incompatibility, feminization, male killing and parthenogenesis induction (PI). Trichogramma kaykai is a tiny wasp that parasitizes on lepidopteran eggs. When a female of the wasp is infected with PI-Wolbachia, the female produces female offspring via gamete duplication without the aid of sperm. As she ages, however, the fraction of male offspring increases. In this study, we investigated the effect of host genetic background on the expression of sex ratio between isofemale lines. Virgin females of six isofemale lines were allowed to lay eggs individually for 10 days. There was the positive relationship between female age and the offspring sex ratio. Furthermore, the sex ratio was significantly different among isofemale lines, implying that the host genetic background had an effect on the sex ratio. Based on the results, evolution of symbiosis in terms of sex ratio and future experimental design are discussed.
Hwakyung Hwang,Yikweon Jang,Gilsang Jeong 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10
The α-proteobacterium Wolbachia is maternally inherited and is known to induce reproductive distortions in a wide range of insect taxa such as cytoplasmic incompatibility, feminization, male killing and parthenogenesis (PI). When a female is infected with PI-Wolbachia, she does not need a male to produce female offspring, because the female can produce female offspring via gamete duplication without the aid of sperm. However, in the parasitoid wasp Trichogramma kaykai species, Wolbachia infected parthenogenetic females still produce a fraction of male offspring. Offspring sex ratio for 10 days are different according to each T. kaykai isofemale line that is infected with PI- Wolbachia. This may be caused by complex interactions between Wolbachia and the host genetic backgrounds on converting sex of infected eggs.
Wolbachia infection in the Loxoblemmus complex (Orthoptera: Gryllidae) in Korea
Jeong, Gilsang,Ahn, Jaeha,Jang, Yikweon,Choe, Jae Chun,Choi, Hansu 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol. No.
The Wolbachia bacterium is one of the most prevalent intracellular symbionts of invertebrates, particularly insects. This bacterium induces four distinct reproductive anomalies such as cytoplasmic incompatibility, feminization, male killing, and parthenogenesis of its hosts. Here we report that three closely related cricket species, Loxoblemmus doenitzi, L. campestris, and L. equestris can become infected with Wolbachia. Based on the 16s rRNA sequences, all three species were single infections. However, Wolbachia infecting L. campestris showed diverse Wolbachia surface protein gene sequences resembling multiple infections. In addition, all Wolbachia strains in the three host species harbored the Wolbachia specific bacteriophage.
Calling song evolution and speciation in three closely related cricket species
Jaeha Ahn,Gilsang Jeong,Amanda Wee Huixin,Sim Sze Ching Danielle,Yeo Qin Yi,Hyojoong Kim,Yikweon Jang 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
To understand the evolution and speciation of closely related species, a multiple approach encompassing morphological, behavioral, and genetic analyses is necessary. In Korea, three species of Loxoblemmus crickets occur widely. L. campestris and L. equestris are morphologically indistinguishable, whereas males of L. doenitzi are different from the other two species in head morphology. The genetic analyses using the partial mitochondrial COI sequences showed that L. doenitzi diverged off earlier than L. campestris and L. equestris. The analyses of laboratory recordings revealed that distributions of calling song characters generally overlapped among three cricket species. However, the number of pulses in a chirp was two in L. doenitzi and four in L. campestris, but it was greater than or equal to six in L. equestris. Provided that females make mate choice based on this calling song character, the differentiation in this character may lead to premating reproductive isolation and may have evolved during the speciation proccess in these closely related species.
자동차 실내 열부하 저감을 위한 태양에너지 응용기술 검토에 관한 연구
이대웅(Daewoong Lee),장길상(Gilsang Jang),오동훈(Donghoon Oh),조경석(Kyungseok Cho),김용철(Yongchul Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The aim of this paper is to investigate solar energy application for reducing cabin thermal load. When the vehicle parked under the sun in summer, interior temperature is up to 70℃ which is depend on solar intensity. So, solar, one of the alternative energy considered as vehicle thermal comfort solutions, and conducted vehicle cabin thermal load accumulation with forced ventilation for solar energy simulation. Only operating of the air handling system blower by using external power supply, average temperature of cabin room reduced about over 10℃ to 20℃. Means, cabin thermal comfort is improved without extra energy consumption in the vehicle, and cool down performance of air-conditioning system will is better than current vehicle. Moreover fuel economy will be increased due to less air-conditioning system operating and have many opportunities of human advantage such as minimized VOCs by suppling clean air to cabin and healthy cabin environment by dehumidification of evaporator.
하둡 기반의 통합설비 모니터링시스템 설계 및 구현 사례 연구
김상락(Sangrak Kim),장길상(Gilsang Jang),조지운(Chiwoon Cho) 대한산업공학회 2014 대한산업공학회지 Vol.40 No.1
SCADA and DCS that have performed automatic control and monitoring activities increase the productivity of enterprise in industries. In such systems, although their performance had been improved, there are still many deficiencies in predictive maintenance which can foresee the risk of any kinds of accidents. Because the data acquisition systems of main facilities are being distributed throughout the whole plant and therefore, integration of data obtained from the systems is very difficult. Accordingly, techniques that acquire meaningful information from the gathered data through realtime analysis still need to be improved. This paper introduces a developed facility monitoring system which can predict equipment failure and diagnose facility status through big data analysis to improve equipment efficiency and prevent safety accidents.