중소형 망원경 제어 시스템 MS-TCS 개발

한인우,남욱원,HAN INWOO,NAM UK-WON 한국천문학회 1998 天文學論叢 Vol.13 No.1

In this paper we describe MS-TCS, the telescope control system which was developed in Korea Astronomy Observatory. MS-TCS can control an equatorial type telescope equipped with stepping motors and incremental type optical encoders. MS-TCS consists of (1) POINT_TEL which is the program roning in a PC and (2) TCS-196 which is the electroics board to control the telescope. The communication between the PC and TCS-l96 is done through RS-232 or RS-422 serial line. MS-TCS can control the secondary mirror and dome. It also provide network function using TCP/IP for remote control of the telescope. MS-TCS is suitable for controlling medium to small size telescope for research and education.

연근해어업 온실가스 배출량에 관한 기초 연구

한인우(Inwoo HAN),김관대(Gwandae KIM),김용수(Yongsoo KIM),이경훈(Kyounghoon LEE) 전남대학교 어업기술연구소 2016 어업기술연구소보고지 Vol.9 No.1

The purpose of this study was to investigate the energy consumption and greenhouse gas emissions according to fuel consumption in the littoral sea fishery. The fishing boat in the Korean littoral zone is currently registered at 68.000 vessels, most fishing vessels are almost over 70% got an aged are concentrated between 10-20 years so that its engine efficiency is terribly poor. Fishing environment of hazardous substances and greenhouse gas emissions from the engine is a high situation. In study, it needs to build a database of greenhouse gas emissions by sector, and it will be the corresponding plan for carbon reduction in the fisheries by Tier-1 evaluation on IPCC 2006 Guidelines.

선자망어업이 어업생물에 미치는 영향

한인우 ( Inwoo Han ),윤은아 ( Euna Yoon ),오우석 ( Wooseok Oh ),이경훈 ( Kyounghoon Lee ) 한국어업기술학회 2017 수산해양기술연구 Vol.53 No.1

Encircling gill net fishery is a kind of gill net which is generally used in shallow coastal waters. After the fish have been encircled by the gill net, noise stimulus such as a stone or sound is used to force them to gill or entangle themselves in the netting surrounding them. Although the fishing by a stone is a traditional fishing method, it is considered as an illegal fishing method by physical stimulus such as explosives and mechanical vibrator. However, this illegal fishing method has raised some problems to the fishing boat of other fisheries or many anglers due to disturb aggregating fish schools. This study is aimed to provide scientific base data to verify whether to impact the ecosystem caused by this encircling gill net. This study exhibited that the impulse noise by concrete sphere in the encircling gill net was 159 dB/μPa, the ambient noise from ship engine was 160 dB/μPa, and the maximum noise from continuous artificial vibrator was 175 dB/μPa. These may be stimulus to the escape of fish distributed in a wide area in its natural state; it is not likely the cause of death due to catastrophic stress. Therefore, it needs to prepare the consideration of standard limit on fishing stimulus in fishing methods of the fishery laws and regulations, prevent fishermen form using illegal fishing gear (i.e. explosive sound standards: 200~220 dB/μPa) and provide them with countermeasures.

Planetary companions orbiting K giant HD 208527 and M giant HD 220074

이병철,한인우,박명구,Lee, Byeong-Cheol,Han, Inwoo,Park, Myeong-Gu 한국천문학회 2012 天文學會報 Vol.37 No.2

The purpose of the present study is to search for and study the origin of planetary companion by a precise radial velocity (RV) survey for K dwarfs. The high-resolution spectroscopy of the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) at Bohyunsan Optical Astronomy Observatory (BOAO) is used from September 2008 to June 2012. We report the detection of two new exoplanets in orbit around HD 208527, and HD 220074 with exhibiting a periodic variation of 875.5 and 672.1 days. The examinations of surface inhomogeneous are no related to the RV variations and Keplerian motion is the most likely explanation, which suggests that the RV variations arise from an orbital motion under the influence of planetary companion. We obtain the minimum masses for the exoplanets of 11.5 and 11.1 MJup with an orbital semi-major axis of 2.3 and 1.6 AU and an eccentricity of 0.08 and 0.14, respectively. From the literatures and our estimations of stellar parameters, the luminosity class of HD 208527 is changed K dwarf to K giant and the spectral type of HD 220074 is confirmed M giant rather than K dwarf. HD 220074 is the first M giant star harboring a planetary companion.

지구 대기 흡수선 스펙트럼 계산

정광희,한인우,이병철,Jeong, Gwanghui,Han, Inwoo,Lee, Byeong-Cheol 한국천문학회 2014 天文學論叢 Vol.29 No.3

In ground-based astronomical spectroscopic observations, there are many telluric absorption lines that are laid on the spectra of celestial objects. To study the physical properties of the celestial objects with these contaminated spectra, the telluric lines should be removed. A conventional method for removing the telluric lines is using the standard stellar spectrum as telluric line. In this paper, we introduce a technique to calculate synthetic telluric spectra and use them to remove telluric lines from a spectrum of a celestial object. We used Line-by-Line Radiative Transfer Model (LBLRTM) for calculating a synthetic spectrum and selected Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) model as atmospheric model. We apply our method to some spectra obtained by Bohyunsan Observatory Echelle Spectrograph (BOES) to show that the telluric lines are well removed from the observed spectra by our model within an accuracy of 2% which is close to the 1-sigma rms of the original spectra.

WWW를 이용한 원격관측시스템

박병곤,육인수,한인우,김승리,천무영,성현철,PARK BYEONG-GON,YUK IN-SOO,HAN INWOO,KIM SEUNG-LEE,CHUN MOO-YOUNG,SEONG HYEON-CHEOL 한국천문학회 1998 天文學論叢 Vol.13 No.1

We present the development of a remote observation system runnig on world wide web (WWW). The system consists of a 30cm Schmidt Cassegrain telescope and ST-7 CCD camera. We built the controllers and drivers of the telescope and the control softwares including the network control. The self-developed techniques in the hard wares and softwares can be applied to other projects in Korea. Observers can access the system via WWW home page, to reserve observation times, to send control commands, to retrieve images and various information useful for observation. This system can be widely used by students and amateur astronomers as well as professional astronomers who need a lot of small telescope time.

광양만 주변 해역의 수산자원 분포 및 계절적 변화

김흥윤(Heung-Yun KIM),한인우(Inwoo HAN),오우석(Wooseok OH),최정화(Junghwa CHOI),이경훈(Kyounghoon LEE) 한국수산해양교육학회 2018 水産海洋敎育硏究 Vol.30 No.6

Using the shrimp beam trawl fishing gear as a specific type of coastal fishing gear with a relatively small mesh size compared to others, this survey was carried out at three stations around Yeosu and Namhae coastal area. The length of the beam used was 8m with a speed of about 2 knots; the net was hauled in after 30 minutes at each station. The collected data were classified into fish, crustacea, and cephalopoda. A total of 77 species were found in this study: 52 species of fish, 17 species of crustacea, 5 species of cephalopoda, and 3 other species. The resources density at each station according to the season was the highest as 5,607 kg/km2 at Station B in August 2016, and the lowest as 167kg/㎢ at Station B in May2016.

여수·남해연안해역 새우조망의 혼획률 산정

차승윤(Seungyun CHA),박태준(Taejun PARK),한인우(Inwoo HAN),이경훈(Kyounghoon LEE) 전남대학교 어업기술연구소 2018 어업기술연구소보고지 Vol.11 No.1

The bycatch ratio was analyzed in the Yeosu coastal area by the shrimp beam trawl net from May, 2016 to May, 2017. According to the small mesh size of the beam trawl, lots of demersal fish were caught and it makes to decrease fisheries resources in the Korean fishery. During the survey period, it was caught in 466.8 kg of 76 species which include 51 fish species, 17 crustaceans and 8 other species, were caught in survey area. The dominant species of Argyrosomus argentatus, Thryssa kammalensis, Trichiurus lepturus, Larimichthys polyactis were a caught. Shrimps of Marsupenaeus japonicus, Metapenaeus joyneri, Fenneropenaeus chinensis, Trachysalambria curvirostris, Parapenaeopsis tenella and Palaemon gravieri were a caught in the survey area. Although the catch amount of shrimps in May and August was small, it increased sharply at February when water temperature was lowered, to 89.3% of the total catch amount. The Bycatch ratio near to Gwangyang-man coastal area was 60.7%, and it was shown that the bycatch ratios in Yeosu and Namhae coastal area were 79.7% and 81.4%, respectively.

여수해역의 새우조망 어구의 혼획률 분석

곽의환(Uihwan KWAK),장원근(Wonkeun JANG),한인우(Inwoo HAN),이경훈(Kyounghoon LEE) 전남대학교 어업기술연구소 2017 어업기술연구소보고지 Vol.10 No.1

From May to November, 2016 (May, August, November), the survey was conducted to investigate the actual condition on the shrimp beam trawl net in Yeosu coastal area. Because the mesh size of the shrimp beam trawl net is small, various benthic fish were caught together with shrimp. During the survey period, total 361.5 kg of 79 species which include 52 fish species, 18 crustaceans and 6 cephalopods was caught in the target area. The dominant species were Argyrosomus argentatus, Thryssa kammalensis, Trichiurus lepturus, Metapenaeus joyneri, and Larimichthys polyactis. The caught species of shrimp in Yeosu coastal area were shown to be Parapenaeopsis tenella, Trachysalambria curvirostris, and Metapenaeus joyneri. Although the catch amount of shrimp was decreased in May and August, it was sharply increased from November when the water temperature became lowered. In November, the catch amount of shrimp accounted for 87% of the total catch amount. For analysis by coastal area, Yeosu coastal area were grouped as A and B, and Namhae coastal area was classified as C. It was shown that the catch rate of Yeosu coastal area was 76.6% and the catch rate of Namhae coastal area was 88.6%. In order to reduce the catch rate of shrimp by the beam trawl net, the bycatch reduction device (BRD) should be mandatory and studies on technical parts such as selective fishing techniques should be carried out together.

광양만 새우조망 혼획률 비교분석

김상헌(Sangheon KIM),김소연(Soyeon KIM),한인우(Inwoo HAN),이경훈(Kyounghoon LEE) 전남대학교 어업기술연구소 2019 어업기술연구소보고지 Vol.12 No.1

The Shrimp beam trawl is a net that drags from bottom layer. It causes a high ratio of bycatch including small shrimp because of its small mesh sizes. The bycatch ratio was analyzed in the Gwangyang bay using the shrimp beam trawl from June, September and December 2018. Results showed that Trachysalambria among all shrimp species was caught the most (61.3%) and Pennahia argentata among the bycatch was caught the most (24.4%). The average bycatch ratio was estimated to be about 11.8%.