A Study of the Yang-gyeong-gyu-il-ui (兩景揆日儀) in the Joseon Dynasty

Lee, Yong Sam,Kim, Sang Hyuk,Mihn, Byeong-Hee The Korean Space Science Society 2015 Journal of Astronomy and Space Sciences Vol.32 No.1

The Yang-gyeong-gyu-il-ui (兩景揆日儀) is a kind of elevation sundial using three wooden plates. Sang-hyeok Lee (李尙爀, 1810~?) and Byeong-cheol Nam (南秉哲, 1817~1863) gave descriptions of this sundial and explained how to use it in their Gyu-il-go (揆日考) and Ui-gi-jip-seol (儀器輯說), respectively. According to Gyu-il-go (揆日考) there are two horizontal plates and two vertical plates that have lines of season and time. Subseasonal (節候) lines are engraved between seasonal (節氣) lines, subdividing the interval into three equal lines of Cho-hu (初候, early subseason), Jung-hu (中候, mid subseason) and Mal-hu (末候, late subseason); there are 13 seasonal lines for a year, thus resulting in 37 subseasonal lines; also, there are 12 double-hour (時辰) lines for a day engraved on these plates. The only remaining artifact of Yang-gyeong-gyu-il-ui was made in 1849 (the $15^{th}$ year of Heon-jong) and is kept at the Korea University Museum. We have compared and analyzed Yang-gyeong-gyu-il-ui and similar western sundials. Also, we have reviewed the scientific aspect of this artifact and built a replica. Yang-gyeong-gyu-il-ui is a new model enhanced from the miniaturization development in the early Joseon Dynasty and can be applied to the southern part of the tropic line through a structure change.

A Study of the Yang-gyeong-gyu-il-ui (兩景揆日儀) in the Joseon Dynasty

Yong Sam Lee,Sang Hyuk Kim,Byeong-Hee Mihn 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.1

The Yang-gyeong-gyu-il-ui (兩景揆日儀) is a kind of elevation sundial using three wooden plates. Sang-hyeok Lee (李尙爀, 1810~?) and Byeong-cheol Nam (南秉哲, 1817~1863) gave descriptions of this sundial and explained how to use it in their Gyu-il-go (揆日考) and Ui-gi-jip-seol (儀器輯說), respectively. According to Gyu-il-go (揆日考) there are two horizontal plates and two vertical plates that have lines of season and time. Subseasonal (節候) lines are engraved between seasonal (節氣) lines, subdividing the interval into three equal lines of Cho-hu (初候, early subseason), Jung-hu (中候, mid subseason) and Mal-hu (末候, late subseason); there are 13 seasonal lines for a year, thus resulting in 37 subseasonal lines; also, there are 12 double-hour (時辰) lines for a day engraved on these plates. The only remaining artifact of Yang-gyeong-gyu-il-ui was made in 1849 (the 15th year of Heon-jong) and is kept at the Korea University Museum. We have compared and analyzed Yanggyeong- gyu-il-ui and similar western sundials. Also, we have reviewed the scientific aspect of this artifact and built a replica. Yang-gyeong-gyu-il-ui is a new model enhanced from the miniaturization development in the early Joseon Dynasty and can be applied to the southern part of the tropic line through a structure change.

한국인 혀동맥의 형태

김희진(KIM Hee Jin),강민규(KANG Mill Kyu),김진학(KIM Jm Hak),박재한(PARK Jae Han),이상섭(LEE Sang Heon),이상헌(LEE Sang Sup),정인혁(CHUNG In Hyuk2) 대한체질인류학회 1997 대한체질인류학회지 Vol.10 No.2

연구자들은 한국인 어른 남녀 시신의 머리와 목 61 을 대상으로 깊은 층 육안해부를 시행하여 혀동맥의 형태를 조사하였다 혀동맥이 일어나는 유형은 위갑상동맥, 혀동맥, 그리고 얼굴동맥이 바깥목동액에서 따로 가지를 내어 나뉘는 경우가 563% 호 가장 않았으며, 얼굴동맥과 혀동맥이 강은 가지에서 얼어나 나뉘는 경우 (312%), 그리고 위 강상동액과 혀동맥이 같은 가지에서 나뉘는 경우 (12 5%) 등이 있었다. 혀동맥과 혀동맥의 둘째 부분은 덮는 목뿔혀근 과의 영대학적 관계는 각각 혀동맥의 첫째 부분이 목뿔혀근 뒤에서 심하게 휘어져 깊은 층으로 들어가는 유형 (41 2 %), 그리고 혀동맥의 첫째 부분이 목뿔혀근의 뒤쪽 근육모셔리 바로 뒤흘 지나 깊은 층으로 들어가는 경우가 661% 로 가장 많았다 목뿔혀근 깊은층에서 혀동맥의 둘째 부분이 달리는 양상은 급하게 위쪽으로 꺾역 달리다가 다시 앞쪽으로 꺾여 혀의 깊은 곳으로 들어가는 경우와 목뿔빼에서 혀쪽으로 완만한 굽이플 이루며 올라가는 경우가 비슷한 반도로 관찰되었다. 입안바닥에 분포하는 혀밑동맥이 혀동맥 셋째 부분에서 나오는 경우슨 전체의 590% 에서만 관창되었으며 그 외는 대부분 얼굴동맥의 턱끝 및동맥 가지가 턱옥뽕근응 옳고 입안바닥에 분포하였다. 따라서 연구자들은 한국인 업안바 닥에는 혀동액이 전체의 59%에서만 분포하며 그외는 영굴동액의 턱끝밑동맥 가지 , 그리고 기타 다른 동맥의 가지들이 분포한다는 사실을 확인하였다

Constituents and the Antitumor Principle of Allium victoriallis var. platyphyllum

Lee, Kyung-Tae,Choi, Jung-Hye,Kim, Dong-Hyun,Son, Kun-Ho,Kim, Won-Bae,Kwon, Sang-Hyuk,Park, Hee-Juhn The Pharmaceutical Society of Korea 2001 Archives of Pharmacal Research Vol.24 No.1

To search for cytotoxic components from Allium victoriallis , MTT assays on each extract and an isolated component, gitogenin 3-O-lycotetroside, were performed against cancer cell lines. Cytotoxicities of most extract were shown to be comparatively weak, though $IC_50$ values of $CHCl_3$fraction was found to be <31.3-368.4 $\mu\textrm{g}/ml$. From the incubated methanol extract at $36^{\circ}C, eleven kinds of organosulfuric flavours were predictable by CG-MS performance. The most abundant peak was revealed to be 2-vinyl-4H-1,3-dithiin(1) by its mass spectrum. Further, this extract showed significant cytotoxicities toward cancer cell lies. Silica gel column chromatography of the n-butanol fraction led to the isolation of gitogenin 3-O-lycotetroside (3) along with astragalin (4) and kaempferol 3, 4'-di-O-$\beta$-D-glycoside (5). This steroidal saponin exhibited significant cytotoxic activities ($IC_50$, 6.51-36.5 $\mu\textrm{g}/ml$) over several cancer cell lines. When compound 3 was incubated for 24 h with human intestinal bacteria, a major metabolite was produced and then isolated by silica gel column chromatography. By examining parent and prominent ion peak in FAB-MS spectrum of the metabolite, the structure was speculated not to be any of prosapogenins of 3, suggesting that spiroketal ring were labile to the bacterial reaction. These suggest that disulfides produced secondarily are the antitumor principles.

Package-level integrated antennas based on LTCC technology

Sang-Hyuk Wi,Yong-Bin Sun,In-Sang Song,Sung-Hoon Choa,Koh, I.-S.,Yong-Shik Lee,Jong-Gwan Yook IEEE 2006 IEEE transactions on antennas and propagation Vol.54 No.8

<P>We propose a novel package topology integrating multilayer miniaturized antennas. Such a functional package is suitable for the design of a system-on-chip device, or of system-on-package applications. A stacked patch antenna is designed and integrated in a package using a low temperature co-fired ceramic process. The overall size of the package is 10.3times10.3times1.3 mm<SUP>3</SUP>, and this package contains an 8.3times8.3times0.7 mm<SUP>3</SUP> internal space for the integration of chip-scale packaged components. The package is mounted on a 20times20 mm<SUP>2</SUP> ground plane to miniaturize the volume of the system. The antenna is designed to have two neighboring resonant frequencies at 5.264 and 5.355 GHz, resulting in a 140 MHz impedance bandwidth. However, the measured resonant frequencies occur at slightly higher frequencies due to manufacturing tolerances. Radiation patterns are similar to a conventional patch antenna. In addition, various parasitic effects rooted in the package size, ground size, antenna height, SMA connector, via misalignment, and the number of via holes and their locations are fully investigated</P>

[< 구두-C-07 >] Bending performance of nail-jointed cross laminated timber

( Sung-jun Pang ),( Kwang-mo Kim ),( Sang-joon Lee ),( Sun-hyang Park ),( Jin Hyuk Kong ) 韓國木材工學會 2017 한국목재공학회 학술발표논문집 Vol.2017 No.1

Treadmill exercise and wheel exercise improve motor function by suppressing apoptotic neuronal cell death in brain inflammation rats

Sang-Hyuk Song,Yong-Seok Jee,Il-Gyu Ko,Sang-Won Lee,Young-Je Sim,Dae-Young Kim,Sam-Jun Lee,Young Sam Cho 한국운동재활학회 2018 JER Vol.14 No.6

Trends in recent waterborne and foodborne disease outbreaks in South Korea, 2015–2019

Sang Hyuk Lee,Jae-Won Yun,Ji Hee Lee,Yeon Haw Jung,Dong Han Lee 질병관리본부 2021 Osong Public Health and Research Persptectives Vol.12 No.2

Objectives: This study analyzed trends in foodborne and waterborne diseases in South Korea between 2015 and 2019. Methods: The data consisted of information on outbreaks of waterborne and foodborne infectious diseases reported through the Korea Centers for Disease Control and Prevention (KCDC) system. We analyzed the trends and epidemiological aspects of outbreaks by month, place of occurrence, and causative pathogens in this observational study. Results: The number of outbreaks has steadily increased over the last 5 years, but the number of cases per outbreak has followed a decreasing trend. Incidence at daycare centers and preschools has been steadily increasing over consecutive years. Conclusion: The steady number of patients and decreasing number of cases per outbreak, even as the number of outbreaks has been increasing, suggest that the KCDC’s professional management system is operating effectively. It is necessary to continue improving the objectivity and efficiency of the management system and to carefully examine the increasing number of outbreaks in smaller-scale group catering facilities, such as daycare centers and preschools. Outbreaks can be prevented by closely examining those caused by unidentified pathogens and group outbreaks caused by other diseases, identifying problems, and supplementing the management system.

Comparative characteristics of three human embryonic stem cell lines.

Lee, Jung Bok,Kim, Jin Mee,Kim, Sung Jong,Park, Jong Hyuk,Hong, Seok Ho,Roh, Sung Il,Kim, Moon Kyoo,Yoon, Hyun Soo Korean Society for Molecular Biology 2005 Molecules and cells Vol.19 No.1

<P>Human embryonic stem (hES) cells have unique features including unlimited growth capacity, expression of specific markers, normal karyotypes and an ability to differentiate. Many investigators have tried to use hES cells for cell-based therapy, but there is little information about the properties of available hES cell lines. We compared the characteristics of three hES cell lines. The expression of SSEA-1, -3, -4, and APase, was examined by immunocytochemistry, and Oct-4 expression was analyzed by RT-PCR. Differentiation of the hES cells in vitro and in vivo led to the formation of embryoid bodies (EBs) or teratomas. We examined the expression of tissue-specific markers in the differentiated cells by semiquantitative RT-PCR, and the ability of each hES cell line to proliferate was measured by flow cytometry of DNA content and ELISA. The three hES cell lines were similar in morphology, marker expression, and teratoma formation. However there were significant differences (P < 0.05) between the differentiated cells formed by the different cell lines in levels of expression of tissue-specific markers such as renin, kallikrein, Glut-2, beta- and delta-globin, albumin, and alpha1-antitrypsin (alpha1-AT). The hES cell lines also differed in proliferative activity. Our observations should be useful in basic and clinical hES cell research.</P>

Ultrathin Electronic Composite Sheets of Metallic/Semiconducting Carbon Nanotubes Embedded in Conjugated Block Copolymers

Sung, Jinwoo,Huh, June,Choi, Ji‐,Hyuk,Kang, Seok Ju,Choi, Yeon Sik,Lee, Geun Tak,Cho, Junhan,Myoung, Jae‐,Min,Park, Cheolmin WILEY‐VCH Verlag 2010 Advanced Functional Materials Vol.20 No.24

<P><B>Abstract</B></P><P>Ultrathin composite films consisting of mixtures of metallic (m‐) and semiconducting (s‐) single‐walled carbon nanotubes (SWNTs) with a conjugated block copolymer are developed from a solution‐based process. The electronic properties of the films are precisely controlled from metallic to semiconducting to insulating. The tunability of the electronic composite sheets is mainly attributed to (1) the efficient dispersion of SWNTs with a conjugated block copolymer in solution, (2) the control of the number of nanotubes by centrifugation, and (3) the individually networked deposition of SWNTs embedded in the conjugated block copolymer on the target substrate by spin‐coating. A highly reliable field‐effect transistor with a networked composite film is realized with a specific range of tube density and a high on/off current ratio of approximately 10<SUP>6</SUP> which resulted from the Schottky barriers evolved between the individual m‐ and s‐SWNTs in the network. There is also great freedom when choosing both the gate dielectrics and source‐drain electrodes for transistors containing the composite films. Furthermore, the fabricated electronic composites are highly transparent, flexible, and chemically robust and thus, they can be conveniently micropatterned by photolithography, as well as by unconventional transfer printing techniques.</P>