담수산새우 Macrobrachium rosenbergi(de Man) 의 초기유생 및 post - larva 의 성장에 미치는 염분량에 관하여

권진수,우야관,소립원의광 한국수산학회 1977 한국수산과학회지 Vol.10 No.2

The fresh water prawn, Macrobrahium rosenbergi(de Man) is a very common species in Indo-pacific region, which inhaits both fresh and brackish water in low land area, most of rivers and especially aboundant in the lower reaches which are influenced by sea water. It is one of the largest and commercial species of genus Macrobrachium, which is commonly larger than 18~21 cm in body length, from the basis of eye-stalked to the distal of telson. As a part of the researches in order to investigate the possibilities on transplantation and propagation of this species, this work dealt with the problems on the effects of chlorinities upon zoeal larvae and post-larvae- 1). metamorphosis rate and optimum chlorinity for metamorphosis to post-larve, 2). tolerance and comparative survival rate on various chlorinties, from fresh water to sea water (19.38‰CI), which reared for six days upon each stage of zoeal larvae, 3). accomodation rate on chlonities which reared for twelve days after transmigration into variant chlorinities of the range from 3.68‰CI to 1.53‰CI in the way of rearing of the range from 3.82‰CI to 11.05‰CI upon each stage of zoea, 4). tolerance on both fo fresh and sea water upon zoeal larva and post-larva under the condition of 28℃ 1 in temprature and feeding on Arteinia salina nauplii, 5). relationship between various chlorinities and growth of post larvae under the condition of 28℃ in temperature and feeding on meat of clam. Thus these investigations were performed in order to grope for a comfortable method on seedmass production. Up to the present, the study on the effects of chlorinity upon earlier zoeal larvae and post-larvae of Macrobrachium species has been scarcely performed by workers with the exception of Lewis(1961) and Ling(1962, 1967), even so their works were not so detailed. On the other hand, larvae of several species of this genus were reared at the water which mixed sea water so as to carry out complete metamorphosis to post-larva by workers in order to investigate on earlier larval and earlier post-larval development, such as Macrobrachium lamerrei (Rajyalakshmi, 1961), M. rosenbergi and M. nipponense (Uno and Kwon, 1969; Kwon and Uno, 1969), M. acanthurus (Choudhury, 1970; Dobkin, 1971), M. carcinus (Choudhury, 1970), M. formosense (Shokita, 1970), M. olfersii (Duggei et al., 1975), M. novaehallandiae (Greenwood et al., 1976), M. japonicum (Kwon, 1974) and M. lar (Shokita, personal communication), and there-fore it is regarded that chlorinity is, generally, one of absolute factors to rear zoeal larvae of brackish species of Macrobrachium genus. Synthetic results on this work is summarized as the follwings: 1) Zoeal larvae required different chlorinities to grow according to each stage, and generally, it is regarded that optimum range of living and growing is from 7.63‰CI to 12.42‰CI, and while differences of metamorphsis rate, from first zoea to post-larva, is rarely found in this range, and however it occurs apparently in both of situation at 4.42‰CI below and 16.13‰CI above and moreover, metamorphosis rate is delayed somewhat in case of lower chlorinity as compared with high chlorinity in these situations. 2) Accomodation in each chlorinity on the range, from fresh water to sea water, is different according to larval stages and while the best of it is, generally, on the range from 8.28‰CI to 12.42‰CI and favorite cholrinity of zoea have a tendency to remove from high chlorinity to lower chlorinity in order to advance larval age throughout all zoeal stages, setting a conversional stage for eighth zoea stage. 3) Optimum chlorinity of living and growth upon postlarvae is on the range of 4.25‰CI below, and in proportion as approach to fresh water, growth rate is increased. 4) Post-larvae are able to live better in fresh water in comparison with zoeal larvae, which are only able to live within fifteen hours, and by contraries, post-larvae are merely able to live for one day as compared with zoeal larvae, which are able to live for six days more in sea water (19.3‰CI above). 5) Also, in case of transmigration into higher and lower chlorinities in the way of rearing in the initial chlorinities (3.82‰CI, 7.14‰CI and 11.05‰CI), accomodation rate is as follow: accomodation capacity in ease of removing into higher chlorinities from lower chlorinities is increased in proportion as earlier stages, setting a conversional stage for eighth zoea stage, and by contraries, in case of advanced stages from eighth zoea it is incraesed in proportion as approach to post-larva stage in the case of transmigration into lower chlorinity from highor chlorinity. On the other hand, it is interesting that in case of reciprocal transmigration between two different chlorinities, each survival rate is different, and in this case, also, its accomodation in each zoea stage has a tendency to vary according to larval stages as described above, setting a conversional stage for eighth zoea stage. 6) It is likely that expension of radish pigments on body surface is directly proportional to chlorinity during the period of zoea rearing, and therefore it seems like all body surfaces of zoea larvae be radish coloured in case of higher chlorinity. 7) By the differences that each zoeal larvae, postlarvae, juvaniles and adult prawn are required different chlorinity for inhabiting in each, it is ragarded that this species migrats from up stream to near the estuary of the river which the prawns inhabits commonly in natural field for spawning and growth migration. 8) It had better maintainning chlorinities according to zoeal stage for a comfortable method on seed-mass production that earlier larva stages than eighth zoea are maintained on the range from 8‰CI to 12‰CI to rear, and later larva stages than eighth zoea, by contraies, are gradually regulated to lower chlorininity of the range from 7‰CI to 4‰CI according to advance for post-larva stage.

수정 블럭 제로 트리를 이용한 영상 압축

권진수(Jinsoo Kwon),유지상(Jisang Yoo) 한국통신학회 2000 한국통신학회 학술대회논문집 Vol.2000 No.11

담수산새우 , Macrobrachium rosenbergii ( De Man ) 의 초기유생 생육에 따른 사육 및 이료효과에 관한 연구

권진수,류창열 한국수산과학회 1986 한국수산과학회지 Vol.19 No.6

N/A

유용새우류의 증양식에 관한 세계적인 동향과 우리나라에서의 전망

권진수 한국수산과학회 1984 한국수산과학회지 Vol.17 No.6

N/A

전문대학 평가제도 및 재정지원 정책의 개선방안

권진수 한국고등직업교육학회 2003 한국고등직업교육학회 학술대회 논문집 Vol.2003 No.2

Observer-Based FL-SMC Active Damping for Back-to-Back PWM Converter with LCL Grid Filter

권진수,이한수,김성신 한국지능시스템학회 2015 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.15 No.3

This paper proposes an active damping control method for a grid-side converter that has an LCL grid filter in the back-to-back converter. To remove the resonant frequency components producedbytheLCLfilter,itisnecessarytomeasurethegridcurrent. Todothis,sensorsmust be added. However, it is not necessary to add sensors because the grid current is estimated by designing a suboptimal observer. In order to remove the nonlinearity and to gain fast response of control, both feedback linearization and sliding mode control are applied. The proposed method is verified through a simulation.

엘리베이터 시스템을 위한 SiC 권상기 드라이브

권진수,문석환,김주찬,이준민 전력전자학회 2019 전력전자학회 논문지 Vol.23 No.3

With the recent emphasis on the importance of energy conservation, studies on high-efficiency elevator systems are being continuously conducted. Therefore, pulse width modulation converters are commonly used in traction drives on elevator systems. Wide bandgap devices have been increasingly commercialized, and their application to power conversion systems, such as renewable and energy storage system, has been gradually increasing. In this study, a SiC inverter for an elevator traction drive is investigated. In particular, an inverter is designed to minimize stray and parasitic inductance. Input and output filters are designed by considering switching frequency. The designed SiC inverter reduces volume by approximately 32% compared with that of a Si inverter, and power converter efficiency is over 98.8%.

여행자들의 공유숙박 경험이 지각된 가치와 이용의도 및 추천의도에 미치는 영향

권진수,박영진,양재영 한국호텔외식관광경영학회 2024 호텔경영학연구 Vol.33 No.1

이 연구는 여행자들의 공유숙박 경험이 지각된 가치와 이용의도 및 추천의도에 미치는 영향관계를 파악하기 위해 진행한 연구이다. 본 연구를 충실하게 검증하기 위해서 여행자들에게 자기기입 방식으로 설문지를 작성하게하여 총 298부의 설문자료를 수집하여 통계분석에 활용하였다. 이 연구는 SPSS 22.0 통계패키지 프로그램을 활용해서 연구를 수행하였다. 수집된 표본자료는 빈도분석과 탐색적 요인분석을 수행하여 여행자들의 공유숙박 경험, 지각된 가치, 이용의도, 추천의도 변수들을 도출하였다. 그리고 각각의 변수들에 대한 신뢰도 분석과 타당성 검증 그리고 상관관계분석과 다중회기분석 등을 수행하여 본 연구검증을 수행하였다. 이 연구에 대한 검증결과는 다음과 같다. 첫째, 공유숙박 경험은 지각된 가치에 부분적으로 유의미한 영향을 미치는 것으로 검증되었다. 둘째, 지각된 가치는 이용의도에 유의미한 영향을 미치는 것으로 검증되었다. 셋째, 지각된 가치는 유의미한 영향을 미치는 것으로 검증되었다. 넷째, 이용 의도는 추천의도에 유의미한 영향을 미치는 것으로 검증되었다. 본 연구결과를 통해서 공유숙박서비스 향상과 발전을 위해서는 다양한 프로그램 개발과 보완이 필요하다는 점을 인식하게 되었다. This study was conducted to understand the impact of travelers' shared accommodation experi ences on their perceived value, intention to use, and intention to recommend. In order to verify the validity of this conceptual framework, travelers were asked to fill out a self-administered questionnaire, and a total of 298 questionnaires were collected and used for statistical analysis. This study was conducted using the SPSS 22.0 Statistics program. Frequency analysis and exploratory factor analysis were applied to the col lected data to derive the variables of travelers' shared accommodation experience, perceived value, intention to use, and intention to recommend. Reliability analysis and validation of each variable, correlation analysis, and multiple regression analysis were also conducted in order to verify this study. The results of this study are as follows: First, shared accommodation experience has a partially positive and significant effect on perceived value. Second, perceived value has a positive and significant effect on intention to use. Third, perceived value has a positive and significant effect. Fourth, intention to use has a positive and significant effect on intention to recommend. Through the results of this study, we have determined that various pro grams must be developed and supplemented to improve and develop shared accommodation services.

Design and Control Method for Sub-module DC Voltage Ripple of HVDC-MMC

권진수,김성신,박정우,강대욱 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.4

This paper proposes a design and control method for a high-voltage direction current modular multilevel converter (HVDC-MMC) considering the capacitor voltage ripple of the submodule (SM). The capacitor voltage ripple consists of the line frequency and double-line-frequency components. The double line- frequency component does not fluctuate according to the active power, whereas the line-frequency component is highly influenced by the grid-side voltage and current. If the grid voltage drops, a conventional converter increases the current to maintain the active power. A grid voltage drops, current increment, or both occur with a capacitor voltage ripple higher than the limit value. In order to reliably control an MMC within a limit value, the SM capacitor should be designed on the basis of the capacitor voltage ripple. In this paper, the capacitor voltage ripple according to the grid voltage and current are analyzed, and the proposed control method includes a current limitation method considering the capacitor voltage ripple. The proposed design and control method are verified through simulation using PSCAD/EMTDC.

Macrobrachium rosenbergi(De Maan) 의 초기유생의 성장 및 수온과 변태와의 관계

권진수 한국수산학회 1974 한국수산과학회지 Vol.7 No.2

水槽內에서 馴化된 親蝦에서 부화시긴 幼生을 實驗室內에서 水溫 27.5∼28.7℃, 鹽分 6.58∼7.05‰Cl, pH 8.0-8.2, 照度 3000lux, 濾過水量 0.3ℓ/min의 조건하에서 먹이로는 Artemia salina nauplius를 給與하여 飼育하였다. 2. 갓 부화된 zoea 幼生의 體長을 1.92㎜이며 第1 poat-larva는 7.69㎜로써 11令期의 zoea期에서 第1 post-larva로 變態하며 上記 條件下에서는 35日이 소요되며 第11令期에서 第1 post-larva로 變態할 때 腹節의 길이가 줄어 들고 굵어진다. 3. 갓 부화된 幼生의 第3 腹節의 背面에 出現하는 3個의 免素胞와 尾節의 基部에 나타나는 1個의 色素胞는 Palaemonidae屬외 새로운 分類指標로 重要하다. 4. 幼生의 第6令期 부터 個體變異體 "숙성이"가 出現하며 同一 令期個體郡에서 形態的으로 뛰어나게 크다. 5. 幼生의 全發生令期를 通하여 特히 "숙성이"가 出現하기 쉬운 段階가 있는 것 같으며 이것은 第6令期와 第10令期인 것 같다. 이 現象은 體長의 變動輻의 넓이와 關係가 크며 이것은 攝餌要因이 가장 크게 作用하는 것같다. 6. 幼生의 發生途中 完全한 skipping 現象이 나타나는 것처럼 여겨졌으나, 令期別 各 附屬器官의 形態的인 특징을 比較관찰한 결과, 어느 令期가 完全히 skipping하는 것은 아닌 것 같다. 7. "숙성이"의 附屬器官을 比較檢討한 結果, 한令期에서 다음 令期로 分化發生할 때 各 器官의 分化가 同時에 이루어지는 것이 아니고, 어떤 連關性을 가지며 各 器官마다 個別的인 分化發生速度를 유지하며 分化의 同時性은 볼 수 없는 것 같다. The fresh water prawn, Macrobrachium rosenbergi(De Maan) is a very common species in Indo-Pacific region inhabiting both fresh and brackish waters in low land areas, and especially abindant in the lower reaches of most rivers which are influenced by seawater. It is one of the largest and commercial species of genus Macrobrachium. As a place of the researches to clear the possibilities of transplantation and propagation of this species in the Far Fast region the larval development, growth, optimum temperature and metamorphose rate up to first post larvae in aquarium are cleared under the conditions of salinity 6.58-7.05‰ Cl, pH 8.0-8.2, the rate of flow 0. 3 liter per minute and illumination 3000 lux. Temperature ranged from 27.5 to 28.7℃ during the period of earlier larval development. For the study on the relationship between temperature and metamorphose rate from zoea to first post larvae, the temperatures in experimental tank were 22.2℃ ±1, 26.1℃±0.85, 28.1℃±0.34, 30.4℃±0.66, 33.7℃±0. 66, 33.7℃±0.38 and 36.8℃±0.26. Daring the work, food used for the larvae was Artemia salina nauplius in the filter-circulation aquariums. This species metamorphosed to the first post-larvae through eleven zoea stages, and the characters of each larval stage are described and optimum temperature for metamorphosis rate and survivals to the first post larvae is 28.1℃±0.34.