Rearing the swallowtail butterfly, Papilio xuthus, on a pellet-type artificial diet

Seonghyun Kim,Namjung Kim,Seongjin Hong,Haechul Park,Youngbo Lee,Kwanho Park,Wonho Choi 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10

The effect of an artificial diet on the developmental rate, a life history parameter, was examined for the swallowtail butterfly, Papilio xuthus. Artificial insect diets are an essential component of many insect rearing systems that produce insects for research purposes. Complex agar-gelled diets are generally prepared in large batches and used shortly after preparation because the degradation of perishable diet ingredients, such as vitamins and fatty acids, can adversely affect insect quality (Brewer F D 1984). However, the timing of diet preparation may be inconvenient and large batches wasteful if the unused, excess diet is discarded. This study showed that if the artificial diet was fed during the larval stage, the larval and pupal developmental periods, the percentage of pupation, and the pupal weight generally did not differ significantly among the five artificial diets evaluated. The percentage of pupation varied considerably, with no significant differences among diets except for diet C. A maximum pupation percentage of 83% was observed on diet C. Pellet-type diets were investigated with the aim of developing a more easily prepared diet. The extrusion of the artificial diet under high temperature and pressure may induce desirable chemical and physical changes in the extruded product. The purpose of the present study was to develop an artificial diet for rearing P. xuthus.

협력 송수신을 위한 위상 제어 기법

김성현(Seonghyun Kim),김정환(Junghwan Kim),김종유(Jongyoo Kim),이광현(Kwanghyun Lee),김태완(Taewan Kim),오태근(Taegeun Oh),이상훈(Sanghoon Lee) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.1

잎갈나무와 일본잎갈나무의 물리 및 역학적 특성 비교

김성현 ( Seonghyun Kim ),김도훈 ( Dohoon Kim ),조재익 ( Jaeik Jo ),김종호 ( Jongho Kim ),김남훈 ( Namhun Kim ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1

잎갈나무는 북한의 금강산 일대와 러시아 등 넓은 범위에 걸쳐 분포하고 있으나, 남한에서는 일부 지역 (국립수목원, 가리왕산, 강원대학교 학술림 등)에서만 분포하고 있는 수종으로 목재의 재질에 관한 연구들이 일부 보고되어왔다. 일본잎갈나무는 1970년대 산림녹화를 목적으로 진행된 치산녹화 사업으로 전국에 널리 식재되어 목재의 재질과 이용에 관한 다양한 연구들이 수행되어왔고, 현재 주요 국산 목재 자원으로 활용되고 있다. 하지만, 잎갈나무와 일본잎갈나무 목재의 재질특성을 비교한 연구는 부족한 실정이라 본 연구에서는 두 수종의 효율적인 활용을 위한 재질지표로서 기초자료를 제공하고자 물리 및 역학적 특성을 조사 및 비교하였다. 공시목은 강원도 춘천에 위치한 강원대학교 학술림에서 잎갈나무와 일본잎갈나무를 각각 3본씩 채취하여 사용하였다. 잎갈나무의 심재율과 만재율은 일본잎갈나무에 비해 높게 나타났으며, 잎갈나무의 연륜폭은 일본잎갈나무에 비해 좁았다. 잎갈나무의 생재함수율, 밀도, 수축률은 일본잎갈나무에 비해 높았다. 두 수종간의 종압축강도와 전단강도는 유사한 범위였으나, 심재부에서 잎갈나무의 종압축강도가 일본잎갈나무와 상당한 차이를 보여주었다. 잎갈나무의 경도는 모든 단면에서 일본잎갈나무에 비해 다소 작았다. 두 수종모두 종압축강도와 전단강도는 전건비중과 다소 높은 상관관계가 있었으며, 잎갈나무의 경도는 만재율 및 전건 비중과 높은 상관성이 확인되었다. 본 연구의 결과 잎갈나무와 일본잎갈나무재의 물리 및 역학적 특성간의 차이가 확인되었고, 향후 두 수종의 활용을 위한 재질지표로써 이용될 수 있을 것으로 판단된다.

IEEE 802.11 MAC 프로토콜의 공정성 향상을 위한 EDLI 충돌 윈도우 조절 기법

김민석(Kim Minseok),이성원(Lee Sungwon),김성현(Kim Seonghyun),김영덕(Kim Youngduk),김동균(Kim Dongkyun) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.06

저압측 냉매 압력을 통한 자동차용 증발기 결빙 방지에 관한 실험적 연구

김성현(Seonghyun Kim),이남준(Namjun Lee),김용식(Yongsik Kim),김동균(Donggyun Kim),최의현 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11

User inconvenience due to the freezing evaporator is a chronic problem that occurs continuously in the automotive A/C systems. Currently in most automobile manufacturers adopted air temperature sensor to control compressor operation. But under frozen A/C system operating condition can make worse due to temperature sensor position blockage. So present study shows the possibility of compressor operation with the pressure of the low side refrigerant, which can prevent evaporator freezing problem in uniform air velocity channel duct. present study not only shows pressure control can avoid problem that temperature control have but also give some guidance of choose compressor off/on pressure value, control range on certain A/C system.

Inhibitory effects of a recombinant viral cystatin protein on cysteine protease catalytic activity and development of Plutella xylostella

Yeongtae Kim,Seonghyun Eom,Yonggyun Kim 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04

Cystatins (CSTs) are reversible and competitive inhibitors of C1A cysteine proteases, corresponding to papain-like cathepsins in plants and animals. A viral CST (CpBV-CST1) was identified from a polydnavirus, Cotesia plutellae bracovirus. Our previous study indicated that overexpression of CpBV-CST1 interfered with immune response and development of Plutella xylostella larvae. This study produced a recombinant CpBV-CST1 protein (rCpBV-CST1) using bacterial expression system to analyze its inhibitory activity against cysteine protease and physiological role in the parasitism of an endoparsitoid wasp, Cotesia plutellae. The open reading frame (ORF) of CpBV-CST1 encodes a polypeptide of 138 amino acids (15 kDa). rCpBV-cystatin protein in BL21 STAR (DE3) competent cells containing a recombinant pGEX4T-3:CpBV-CST1 was overexpressed by 0.5 mM IPTG for 4 h. In biological activity assay, partially purified GST-fused rCpBV-CST1 showed inhibitory activity against papain. It also inhibited larval development of P. xylostella in a dose-dependent manner. These results suggest that CpBV-CST1 plays a role in retardation of larval development of P. xylostella during parasitism.

Molecular Taxonomic Analysis of the Korean Tettigonia Linnaeus (Orthoptera: Tettigoniidae: Tettigoniini)

Tae-Kyu Kim,Taeman Han,In Gyun Park,Seonghyun Kim,Tae-Woo Kim,Haechul Park 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04

In our previous study with sequenced data from DNA barcoding region of Korean Tettigonia showed that the Jeju population of T. ussuriana (JJ-Tu) more closely related to T. dolichoptera than mainland population of T. ussuriana (ML-Tu) with low genetic distance (0.87-1.05%). In mitochondrial systematics for a eukaryotic organism including orthopteran insects, sequence data from a short mitochondrial DNA fragment should be trait with caution because nuclear mitochondrial pseudogenes (numts) can be unintentionally coamplified when we use universal primers based on a PCR method. In this study, we retried their sequence analysis to avoid coamplication of numts in sequences from cox1 and cox2 genes. and scrutinized each sequence. The molecular evidences (cox1, cox2, and nad1) for Korean species suggest that JJ-Tu is more closely related to T. dolichoptera (0.76-1.23% in cox1; 1.23-1.54% in cox2; 1.01-1.35% in nad1) than ML-Tu (3.77-4.59% in cox1; 3.61-4.76% in cox2; 2.03-3.25 in nad1). The genetic distance of sequence data from cox1 between JJ-Tu and ML-Tu satisfied a requirement for species-distinction by comparing genetic distance between Tettigonia species. Moreover, JJ-Tu is a geographic population of Tettigonia with different morphological traits that is supported with formed a cluster. Although JJ-Tu closely related to T. dolichoptera with low genetic distance, we will determine its taxonomic status through integrative taxonomic study.

Developmental characteristic of Tenebrio molitor larvae (Coleoptera: Tenebrionidae) in different larval instars

Jongbin Park,Namjung Kim,Wonho Choi,Seonghyun Kim,Hyojung Jin 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10

A Tenebrio molitor larva that is called mealworm is widely used as feed for raising a pet. Also, it is the insect that would be produced as the edible food for human. For these reasons, many researchers are revealing about physiologic characteristic of Tenebrio molitor to make good use of it. However, morphological characteristic of different larval stage is not specifically indicated and researchers have different opinions about the average number of Tenebrio molitor’s instar until now. This study, therefore, was carried out to examine the physiological and morphological characteristics of Tenebrio molitor larva in different larval stages, and the average number of Tenebrio molitor’s instar. As a result, all of the Tenebrio molitor larvae had 7~8 days during their incubation period and 3~4 days during the 1st instar period. After the 1st instar, there were comparatively large differences in the number of days in each instar. Before emergence, most of the larvae comparatively showed 15th~17th instars, particularly, the largest rate of pupae (28.83%) was observed in the 17th instar. In terms of the body length of each Tenebrio molitor larval stage, the body length was gradually increased by the 17th instar. Beyond the 17th instar, however, the body length was smaller than 17th instar. In the 1st instar, the larva had white color, and the color gradually changed into brown from the 2nd instar. Through this study, we could identify the accurate incubation period, 1st instar period, the average number of instar, body length and the color change in different larval stages. These results would be used as a fundamental data for further study about the physiological and morphological characteristic of each instar period.

Neutron-Proton, Neutron-Neutron, Proton-Proton QRPA for the Gamow-Teller and the M1 Spin Transitions of N ≃ Z Nuclei in the s — d Shell

Kim Seonghyun,Ha Eunja,Cheoun Myung-Ki,So W. Y. 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.7

We study the Gamow-Teller (GT) and the M1 spin transitions of the s-d shell nuclei 24Mg, 26Mg, 28Si, 32S, and 36Ar by using a quasiparticle random phase approximation (QRPA) scheme that comprises neutron-proton (np), neutron-neutron (nn) and proton-proton (pp) QRPA owing to the inclusion of the np pairing, as well as nn and pp pairing correlations. At present, we work in spherical symmetry under the assumption that the deformations of the nuclei considered in this work are small enough to neglect, as was customary in past applications. For the GT transition, as well as single and double beta decays, the neutron-proton QRPA (np QRPA) is usually employed. For the M1 spin transition, the pp and nn QRPA is needed due to its neutral current property. The np pairing correlations couple the np QRPA to the nn and pp QRPA. Therefore, the coupled np+nn+pp QRPA enables us to investigate simultaneously the GT and the M1 spin transitions. In particular, in this work, detailed analyses of particle-particle and particle-hole interactions at the QRPA stage are performed for the GT and the M1 spin transitions of the well-known s-d shell N ≃ Z nuclei, and the results are compared to available data. The roles of the np pairing correlations are also discussed for those transitions.

Link Capacity-Energy Aware WDC for Network Lifetime Maximization

Seonghyun Kim,Sanghoon Lee IEEE Computer Society 2015 IEEE Transactions on Mobile Computing Vol. No.

<P>With the increase in flexibility and capabilities of wireless networks, the use of distributed computing over wireless network environments is being researched in order to maximize network sustainability and interoperability among distributed nodes. To this end, a new paradigm is required for optimization of a more generalized environment. This environment would include various nodes of different processing and communication abilities constrained by circuit powers and residual energy over individual dynamic wireless channels. In this paper, we present a novel strategy named link capacity-energy aware wireless distributed computing (LEA-WDC) for maximizing the lifetime of a wireless network. The major advantage of LEA-WDC is its achievement of lifetime maximization by systematically reconciling highly coupled system parameters (tasks, processing power, communication power, and residual energy) in terms of the role of nodes and the layer of each node. To attain an optimal solution, we perform unique interworking optimization via decomposition in accordance with the roles of header and slave nodes. The evaluation results of our simulation verify that the lifetime is further maximized by finding the optimal transmission power of each node according to the Shannon capacity.</P>