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

Radiation-Induced Intratumoral Necrosis and Peritumoral Edema after Gamma Knife Radiosurgery for Intracranial Meningiomas

Lee, Sang-Ryul,Yang, Kyung-Ah,Kim, Sung-Kyu,Kim, Se-Hyuk The Korean Neurosurgical Society 2012 Journal of Korean neurosurgical society Vol.52 No.2

Objective : To study the clinical significance and relevant factors of radiation-induced intratumoral necrosis (RIN) and peritumoral edema (PTE) after Gamma knife radiosurgery (GKRS) for intracranial meningiomas. Methods : We retrospectively analyzed the data of 64 patients who underwent GKRS for intracranial meningioma. The mean lesion volume was 4.9 cc (range, 0.3-20), and the mean prescription dose of 13.4 Gy (range, 11-18) was delivered to the mean 49.9% (range, 45-50) isodose line. RIN was defined as newly developed or enlarged intratumoral necrosis after GKRS. Results : RIN and new development or aggravation of PTE were observed in 21 (32.8%) and 18 (28.1%) cases of meningioma, respectively during the median follow-up duration of $19.9{\pm}1.0$ months. Among various factors, maximum dose (>25 Gy) and target volume (>4.5 cc) were significantly related to RIN, and RIN and maximum dose (>24 Gy) were significantly related to the development or aggravation of PTE. In 21 meningiomas with development of RIN after GKRS, there was no significant change of the tumor volume itself between the times of GKRS and RIN. However, the PTE volume increased significantly compared to that at the time of GKRS (p=0.013). The median interval to RIN after GKRS was $6.5{\pm}0.4$ months and the median interval to new or aggravated PTE was $7.0{\pm}0.7$ months. Conclusion : A close observation is required for meningiomas treated with a maximum dose >24 Gy and showing RIN after GKRS, since following or accompanying PTE may deteriorate neurological conditions especially when the location involves adjacent critical structures.

Therapeutic Effect of Gamma Knife Radiosurgery for Multiple Brain Metastases

Lee, Chul-Kyu,Lee, Sang-Ryul,Cho, Jin-Mo,Yang, Kyung-Ah,Kim, Se-Hyuk The Korean Neurosurgical Society 2011 Journal of Korean neurosurgical society Vol.50 No.3

Objective : The aim of this study is to evaluate the therapeutic effects of gamma knife radiosurgery (GKRS) in patients with multiple brain metastases and to investigate prognostic factors related to treatment outcome. Methods : We retrospectively reviewed clinico-radiological and dosimetric data of 36 patients with 4-14 brain metastases who underwent GKRS for 264 lesions between August 2008 and April 2011. The most common primary tumor site was the lung (n=22), followed by breast (n=7). At GKRS, the median Karnofsky performance scale score was 90 and the mean tumor volume was 1.2 cc (0.002-12.6). The mean prescription dose of 17.8 Gy was delivered to the mean 61.1% isodose line. Among 264 metastases, 175 lesions were assessed for treatment response by at least one imaging follow-up. Results : The overall median survival after GKRS was $9.1{\pm}1.7$ months. Among various factors, primary tumor control was a significant prognostic factor ($11.1{\pm}$1.3 months vs. $3.3{\pm}2.4$ months, p=0.031). The calculated local tumor control rate at 6 and 9 months after GKRS were 87.9% and 84.2%, respectively. Paddick's conformity index (>0.75) was significantly related to local tumor control. The actuarial peritumoral edema reduction rate was 22.4% at 6 months. Conclusion : According to our results, GKRS can provide beneficial effect for the patients with multiple (4 or more) brain metastases, when systemic cancer is controlled. And, careful dosimetry is essential for local tumor control. Therefore, GKRS can be considered as one of the treatment modalities for multiple brain metastase.

HCC : PO-09 ; Clinical characteristics of hepatocellular carcinoma in patient with nonalcoholic fatty liver disease: Comparison with hepatitis C or alcohol-related hepatoma

( Sang Soo Lee ),( Young Sang Byoun ),( Mun Hyuk Seong ),( Hyung Rae Sohn ),( Bo Young Min ),( Eun Sun Jang ),( Jin Wook Kim ),( Sook Hyang Jeong ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.-

Background: The objective of this study was to investigate the characteristics and outcomes of hepatocellular carcinoma (HCC) in patient with nonalcoholic fatty liver disease (NAFLD) in Korea, which were compared to HCC related to hepatitis C virus (HCV) or to alcohol drinking. Methods: A total 424 HCC patients were consecutively enrolled in the hospital from January 2003 to December 2011. NAFLD was attributable to 4.7% of HCC (20 patients), while HBV to 68.2% (n=289)), HCV to 11.6% (n=49), and alcohol to 15.6% (n=66). Retrospective analysis of dermographics, liver function, tumor characteristics, treatment of initial choice and survival rate in NAFLD-HCC group was performed in comparison with HCV-HCC or Alcohol-HCC group. Results: NAFLD-HCC patients showed mean age of 69.9 year, proportion of male (55.0%), obesity (25.0%), diabetes (40. 0%), hypertension (55.0%), and hypercholesterolemia (10.0%) at diagnosis. Moreover, NAFLD-HCC group presented significantly higher rate of single nodular tumor (75.0% vs. 47.0%, p=0.032) and lower rate of portal vein thrombosis (5.0% vs. 28.8%, p=0.027) than HCV-HCC group, respectively. The single nodular presentation was significantly higher in NAFLD-HCC than alcohol-HCC group (75.0% vs. 38.8%, p=0.028, respectively), too. However, there were no significant differences in Child Pugh class, tumor stages (TNM, JIS, CLIP, and BCLC) and overall cumulative survival rate either between NAFLD-HCC and HCV-HCC, or NAFLD-HCC and alcohol-HCC group. Conclusions: NAFLD may take about 5% of current HCC etiology in Korea. The clinical characteristics of NAFLD-HCC were frequent company by metabolic features, single nodular tumor presentation with less frequent portal vein invasion. Further study is warranted to elucidate the biological characteristics of NAFLD-HCC.

Entanglement Description of a Pure Multiqubit

Hyuk-jae Lee,Sung Dahm Oh 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III

We present a description of the entanglement for a multiqubit by using the quantum correlation tensors that rely on the expectation values of the Pauli operators for a multiqubit state. Our description explains not only the total entanglement of the system but also the partial entanglement in subsystems. It shows that we have to consider the subsystem entanglement in order to obtain the full description for multiqubit entanglement. Furthermore, we offer an extension of the entanglement to multiqudits.

Morphometrical Study of Uncinate Processes and Vertebral Body of Cervical Spine

Lee, Tae-Hoon,Kim, Sang-Jin,Chung, In-Hyuk The Korean Neurosurgical Society 2012 Journal of Korean neurosurgical society Vol.51 No.5

Objective : The anatomical knowledge is the most important and has a direct link with success of operation in cervical spine surgery. The authors measured various cervical parameters in cadaveric dry bones and compared with previous reported results. Methods : We made 255 dry bones age from 19 to 72 years (mean, 42.3 years) that were obtained from 51 subjects in 100 subjects who donated their bodies. All measurements from C3-C7 levels were made using digital vernier calipers, standard goniometer, and self-made fix tool for two different cervical axes (canal and disc setting). We classified into 4 groups (uncinate process, vertebral body, lamina, and pedicle) and measured independently by two neurosurgeons for 28 parameters. Results : We analyzed 23970 measurements by mean value and standard deviations. In comparing with previous literatures, there are some different results. The mean values for uncinate process (UP) width ranged from 5.5 mm at C4 and 5 to 6.3 mm at C3 and C7 in men. Also, in women, the mean values for UP width ranged from 5.5 mm at C5 to 6.3 mm at C7. C7 was widest and C5 was most narrow than other levels. The antero-posterior length of UP tended to increase gradually from C3 to C6. The tip way, tip distance, and base distance of UP also showed increasing pattern from C3 to C7. Conclusion : These measurements can provide the spinal surgeons with a starting point to address bony architectures surrounding targeted soft tissues for safeguard against unintended damages during cervical operation.

Phase Behavior Study of Poly(ethylene-co-octene) in normal-Hydrocarbons

( Hyuk Sung Kwon ),( Sang Ho Lee ) 한국고무학회 2003 엘라스토머 및 콤포지트 Vol.38 No.1

N/A Cloud-point and bubble-point data to 170 ℃ and 50 bar are presented for four different solvents, normal pentane, n-hexane, n-heptane, and n-octane with poly(ethylene-co-42 wt% octene)(PEO_42) copolymer. The pressure-concentration isotherms measured for PEO_42 - normal pentane have maximums at around 5 wt% of the copolymer concentrations in the solution. PEO_42 - normal pentane system exhibits LCST-type phase behavior at temperatures greater than 130 ℃. Below 120 ℃, bubble-point type transitions are observed. However, the binary mixtures for PEO_42 in n-hexane, n-heptane, and n-octane have only bubble-point type transitions at the pressure-temperature region investigated in this study. The single-phase region of PEO - alkane mixtures increases with the molecular size of alkane solvent due to the increasing dispersion interactions between PEO and the alkane.

Fast hand and finger detection algorithm for interaction on smart display

Lee, Donghyeon,Kim, Jin-Sung,Lee, Hyuk-Jae Elsevier 2018 Displays Vol.55 No.-

<P><B>Abstract</B></P> <P>This paper presents a fast and accurate hand detection and tracking algorithm for depth images using an object contour analysis for which pairs of horizontal edges of an object are used. The computational complexity for generating the pairs of edges and estimating the object shape is low. A shape analysis is performed in the raster scan order and an object which can be a finger is selected as the finger candidate during the line scan. The initial hand is detected by searching for an object with a shape that corresponds to the predefined shape of the initial hand in the entire depth range. Thus, there is no assumption of the hand location throughout the depth, and the cluttered background has little effect on the detection. This paper also proposes a low-complexity hand tracking method which achieves 97.11% in the detection rate and 10.39 ms in the average processing time for a frame, respectively, when a single hand is detected. For five hands, the average processing time is 21.15 ms. These results show that the proposed method can be applied to the real-time application of vision-based HCI especially for smart display.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A hand detection and tracking method for smart display interface is proposed. </LI> <LI> Left and right edges of an object are used for hand detection in a depth image. </LI> <LI> In two consecutive frames, the hand sample positions are compared for hand tracking. </LI> <LI> There is no limitation in the number of hands for detection and tracking. </LI> </UL> </P>