1.5 Tesla 기기에서 중심주파수 조정과 송 신호강도(Transmission Gain)값 변화에 따른 인공물이 있는 자기공명영상의 질 보상에 관한 연구

이재승,구은회,박철수,이선엽,이한주,Lee, Jae-Seung,Goo, Eun-Hoe,Park, Cheol-Soo,Lee, Sun-Yeob,Lee, Han-Joo 한국의학물리학회 2009 의학물리 Vol.20 No.4

자화율(susceptibility) 및 강자성체(ferromagnetic body)에 의한 인공물(artifact) 영향을 줄이기 위하여 중심주파수(center frequency) 정렬과 송 신호강도(transmission gain)값의 변화로 영상의 질을 보상하고자 한다. 본원에 내원한 환자 중 총 30명에 대하여 두 경부(head and neck)질환을 의심한 환자 중 남자 15명, 여자 15명으로 평균나이는 45세이었다. 사용된 장비는 GE 1.5T unit (GE, General Electric medical system, High Density)를 사용하여 Transmission gain (TG) 값을 평균 몸무게 60 kg을 기준으로 70, 90, 110, 130, 150까지 변환하여 검사를 하였다(p<0.05). 본 연구의 결과로서, 조영제 주입 전과 후의 지방소거 결과는 TG (70, 90, 110, 130, $150=3.23{\pm}0.35$, $4.31{\pm}0.02$, $4.23{\pm}0.21$, $5.12{\pm}0.25$, $7.13{\pm}0.72$, $8.31{\pm}0.01$, $5.21{\pm}0.15$, $6.14{\pm}0.08$, $5.23{\pm}0.72$, $5.91{\pm}0.06$)값에 다른 점수 분포를 나타났다(p<0.05). 절대값 대조도대 잡음비는 (TG, CNRpre, CNRpost, 70: $-1.44{\pm}0.11$, $-2.7{\pm}0.04$, 90: $-2.18{\pm}0.42$, $-4.41{\pm}0.43$, 110: $-2.89{\pm}0.43$, $-5.23{\pm}0.02$, 130: $-2.34{\pm}0.05$, $-5.26{\pm}0.01$, 150: $-2.09{\pm}0.08$, $-3.87{\pm}0.12$)을 얻었다(p<0.05). 본 실험에서 중심주파수 조정과 송 신호강도(transmission gain)값의 변화에 따라 인공물이 있을 때 영상의 질을 보상할 수 있다는 것을 확인하였다. The purpose of this study is to compensate for susceptibility and a ferromagnetic body artifact using CFA and TGV on MR Imaging. A total of 30 patients (15 men and 15 women, mean age: 45 years) were performed on head and neck diseases. MR Unit used a 1.5T superconducting magnet (GE medical system, High Density). This study have investigated by changing with CFA and TGV (70, 90, 110, 130, 150) searching for compensation values about susceptibility and a ferromagnetic body artifact in 60 kg standards of body weight (p<0.05). As a quality results, Image qualities were obtained at different score from CFA and TGV (70, 90, 110, 130, $150=3.23{\pm}0.35$, $4.31{\pm}0.02$ $4.23{\pm}0.21$, $5.12{\pm}0.25$, $7.13{\pm}0.72$, $8.31{\pm}0.01$, $5.21{\pm}0.15$, $6.14{\pm}0.08$, $5.23{\pm}0.72$, $5.91{\pm}0.06$, p<0.05). Absolute CNRs (TG, CNRpre, CNRpost) were acquired with (70:$-1.44{\pm}0.11$, $-2.7{\pm}0.04$, 90:$-2.18{\pm}0.42$, $-4.41{\pm}0.43$, 110:$-2.89{\pm}0.43$, $-5.23{\pm}0.02$, 130:$-2.34{\pm}0.05$, $-5.26{\pm}0.01$, 150: $-2.09{\pm}0.08$, $-3.87{\pm}0.12$, p<0.05). In conclusions, this study could be compensated for metal and flow artifacts surrounding the tissues having artifact by changing CFA and TGV.

앵글을 이용한 콘크리트충전 각형강관기둥-H형강보 접합부의 거동

이재승,김재건,신경재,문태섭,Lee, Jae Seung,Kim, Jae Keon,Shin, Kyung Jae,Moon, Tae Sup 한국강구조학회 1999 韓國鋼構造學會 論文集 Vol.11 No.2

본 연구는 중층철골 구조물 공업화방안에 관한 연구의 기초단계로서 앵글과 고력볼트를 사용한 콘크리트충전 각형강관기둥 H형강보 접합부의 구조적 거동을 파악하는데, 그 목적이 있다. 실험은 앵글의 두께를 주요변수로 하여 정적하중 하에 5종류의 시험체에 대해 실행되었다. 내력추정식은 접합부의 강도를 상계정리에 의한 하한값으로 구하는 항복선 이론을 적용하여 제시하였다. This paper is the first step on the study of the industrialization of the mid-story steel building structures. The purpose of this study is to investigate the structural behavior of concrete-filled square steel tubular column to H-beam connections using angles and high tension bolts. The tests are carried out with five types of specimens under static loading and the main parameter is the thickness of angles. Yield-line theory which obtains connection strength by way of the lowest value based on upper-limit theory is applied to predict strength formulas.

Synthesis and Characterization of the Mixed-valence $[Fe^{II}Fe^{III}BPLNP(OAc)_2](BPh_4)_2$ Complex As a Model for the Reduced Form of the Purple Acid Phosphatase

이재승,이호진,이강봉,허남회,Lee, Jae Seung,Jung, Dong J.,Lee, Ho Jin,Lee, Gang Bong,Heo, Nam Hoe,Jang, Ho G. Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.10

[Fe II Fe III $BPLNP(OAc)_2](BPh_4)_2$ (1), a new model for the reduced form of the purple acid phosphatases, has been synthesized by using a dinucleating ligand, 2,6-bis[((2-pyridylmethyl)(6-methyl-2-pyridylmethyl)ami-no)methyl]-4-nitrophenol (HBPLNP) . Complex 1 has been studied by electronic spectral, NMR, EPR, SQUID, and electrochemical methods. Complex 1 exhibits two strong bands at 498 nm $(\varepsilon=$ 2.6 ${\times}10^3M-^1cm-^1)$ and 1363 nm $(\varepsilon=$ 5.7 ${\times}10^2M-^1cm-^1)$ in $CH_3CN.$ These are assigned to phenolate-to-FeIII and intervalence charge-transfer transitions, respectively. NMR spectrum of complex 1 exhibits sharp isotropically shifted resonances, which number is half of those expected for a valence-trapped species, indicating that electron transfer between FeⅡ and FeⅢ centers is faster than NMR time scale at room temperature. Complex 1 undergoes quasireversible one-electron redox processes. The $FeIII_2/FeIIFeIII$ and $FeIIFeIII/FeII_2$ redox couples are at 0.807 and 0.167 V ver-sus SCE, respectively. It has Kcomp = 5.9 ${\times}$10 1s(acetato) ligand combination sta-bilizes a mixed-valence FeIIFeIII complex in the air. Interestingly, complex 1 exhibits intense EPR signals at g = 8.56, 5.45, 4.30 corresponding to mononuclear high-spin FeⅢ species, which suggest a very weak magnetic coupling between the iron centers. Magnetic susceptibility study shows that there is a very weak antiferromag-netic coupling (J = $-0.78cm-^1$, H = $-2JS_1${\times}$S_2)$ between FeII and FeIII centers. Thus, we can suggest that complex 1 has a very weak antiferromagnetic coupling between the iron centers due to the electronic effect of the nitro group in the bridging phenolate ligand.

식민주의와 법학

이재승 ( Jae seung Lee ) 민주주의법학연구회 2011 민주법학 Vol.0 No.45

This article aims at reviewing colonialist legal ideologies and tackle critically methodological problems raised by legal historians concerning research of the Japanese colonial legal system. The modern international law justified the colonization of non-european worlds by the western Europe under the name of civilizing mission. The Japanese imperialism colonized Korea after its rapid industrialization. The Japanese Empire constructed the capitalist, authoritarian regime in Korea. Colonialist legal ideologies have had continuous bad influences upon the mentality of the Koreans, though the Korean Government had transformed widely the colonial enactments since 1948. Prof. Dr. Chulwoo Lee proposes an alternative quantitative conception of modernity against the normative essentialist one, intending to make a detour around the recent controversy between the colonial exploitation theory and colonial modernization theory. But his proposal does not seem to approach properly the normative view of modernity, because modernity in essence implies a holistic project which aspires to realize the normative ideal of civil society. The terms like ``colonial modernity`` or ``colonial modern law`` are seemingly paradoxical or ambiguous, but very useful to explain the characteristic features of the modern legal history in Korea. Prof. Lee also proposes to introduce the microscopic historical method for catching the legal interplays or games between ordinary people and colonial authority and to understand diversification of forms of colonial domination instead of a naive instrumentalist view of law. But Lee`s methodological proposal lacks in the appropriate structuralist perspective for analyzing colonial oppressive politico-legal structure. Alternatively, this essay reviews the application of Fraenkel`s Dual State Thesis to the Japanese colonial legal system. His theory which originally intended to explain the National-socialist political regime simultaneously offers a good perspective for the Japanese colonial legal system, but with some appropriate modifications.

화해의 문법 -시민정치의 관점에서-

이재승 ( Jae Seung Lee ) 민주주의법학연구회 2011 민주법학 Vol.0 No.46

This article argues that the conception of the political reconciliation in the post-politicide societies should promote victims` rights to legal remedies and guarantees of non-occurrence of the political genocide or violences. This article centers upon the civic politics or citizens` collective subjectivity from the perspective of radical democracy instead of the traditional retributive justice or the alternative restorative justice concerning historical injustices. First, the reconciliation approach should take victims` personal feeling seriously, but more importantly, the political reconciliation should be distinguished from the direct personal reconciliation between victims and wrong-doers. For the latter might easily lose a sight of the dimension of the collective agency and responsibility of the ordinary citizens for state-sponsored violences. Meanwhile, the political reconciliation focuses on the fundamental reform of legal system of human rights and civic politics in the time of public emergency. Second, any forgiveness without the mediation of the deep empathy between victims and perpetrators could lead to the self-destruction of victims and their bereaved, which is described accurately in the novel ``Bug Story`` by Cheong-Jun Lee. From this story a conclusion could be drawn that there are preconditions for forgiveness or reconciliation. The post-genocide political communities should build the relieving conditions for the political reconciliation like the remedial measures of political empowerment, economic redistribution or social recognition. Maslow`s human (meta-)motivation, Honneth`s struggle for recognition and Fraser`s tridimensional justice would be able to suggest good perspective for the just reconciliation in the post-conflict societies. Third, the conception of restorative justice concentrates effectively on the restoration of concrete relationship between the conflicting racial, ethnic or religious groups in the post-genocide societies. But the restorative justice would not be able to capture the whole structure of politicide because of the limited scope of localism. It could not be overlooked that those politicides have been committed by the national or/and global hegemonic blocs during the Cold War. Fourth, the political reconciliation concerning the political violences consists in the dialectical self-conquest of conflicting images of ordinary citizens which are deformed in the epoch of political violences or genocides. The core of the political reconciliation is the collective acknowledgement of the collective responsibility of the ordinary citizens who were not directly involved in the political genocide or violences. The ordinary citizens as the political and moral subjects would arrive at the universal civic consciousness through the political reconciliation. In conclusion, the guarantees of non-occurrence of politicide might be offered only by the radical democracy refusing war politics and politicide in the political sphere, not by the liberal rule of law.

뇌전산화단층검사에서 방사선량 저감을 위한 최적화 프로토콜 연구

이재승,권대철,Lee, Jae-Seung,Kweon, Dae Cheol 대한의용생체공학회 2018 의공학회지 Vol.39 No.3

This study is a model experimental study using a phantom to propose an optimized brain CT scan protocol that can reduce the radiation dose of a patient and remain quality of image. We investigate the CT scan parameters of brain CT in clinical medical institutions and to measure the important parameters that determine the quality of CT images. We used 52 multislice spiral CT (SOMATOM Definition AS+, Siemens Healthcare, Germany). The scan parameters were tube voltage (kVp), tube current (mAs), scan time, slice thickness, pitch, and scan field of view (SFOV) directly related to the patient's exposure dose. The CT dose indicators were CTDIvol and DLP. The CT images were obtained while increasing the imaging conditions constantly from the phantom limit value (Q1) to the maximum value (Q4) for AAPM CT performance evaluation. And statistics analyzed with Pearson's correlation coefficients. The result of tube voltage that the increase in tube voltage proportionally increases the variation range of the CT number. And similar results were obtained in the qualitative evaluation of the CT image compared to the tube voltage of 120 kVp, which was applied clinically at 100 kVp. Also, the scan conditions were appropriate in the tube current range of 250 mAs to 350 mAs when the tube voltage was 100 kVp. Therefore, by applying the proposed brain CT scanning parameters can be reduced the radiation dose of the patient while maintaining quality of image.

간 병변 특이성 조영제 자기공명영상에 대한 연구: Ferucarbotran과 Gd-EOB-DTPA 조영제의 비교

이재승,구은회,박철수,이선엽,최용석,Lee, Jae-Seung,Goo, Eun-Hoe,Park, Cheol-Soo,Lee, Sun-Yeob,Choi, Yong-Seok 한국의학물리학회 2009 의학물리 Vol.20 No.4

다양한 간 질환에 Ferucarbotran (SPIO)과 Gd-EOB-DTPA (Primovist) 조영제를 사용하여 자기공명영상 상에서 비교하여 간 질환의 특성 및 검출 과 그 질환에 따른 조영제 흡수관계를 알아보고자 한다. 실험대상은 국소 간 병변을 가진 50명의 환자 중 남자 25명, 여자 25명으로 평균나이는 50세이었다. 사용된 장비와 코일은 3.0T (General Electric Medical System, Excite HD) 자기공명영상장치와 8채널 채부코일이었다. 질환과 조영제 흡수관계를 비교하기 위하여 사용된 펄스 시퀀스는 Liver aquisition with volume acceleration (LAVA)와 Multi-Gradient rapid Echo (MGRE)이었다. 모든 검사기법은 일정한 데이터를 획득하기 위하여 Ferucarbotran (SPIO) 및 Gd-EOB-DTPA (Primovist) 조영제를 주입 전 후에 같은 위치를 선정하여 검사를 시행했다(p<0.05). 검사 결과는 Ferucarbotran와 Gd-EOB-DTPA의 대조도대 잡음비는 간세포암(HCC, 16 cases)이 $3.08{\pm}0.12$과 $7.00{\pm}0.27$이었다. 과다형성결절(Hyperplastic Nodule, 7 cases) 질환은 $3.62{\pm}0.13$, $2.60{\pm}0.23$, 전이(Metastasis, 13 cases)는 $1.70{\pm}0.09$, $2.60{\pm}0.23$, 초점성 결절성 과증식(Focal Nodular Hyperplasia, 6 cases)질환은 $2.12{\pm}0.28$, $5.86{\pm}0.28$, 농양(Abscess, 8 cases)은 $4.45{\pm}0.28$, $1.73{\pm}0.02$이었다. 또한, 각 질환에 대한 진단적 수행을 위해 ANOVA 검증을 하였다(p<0.05). 결론적으로, 두 조영제 효과로 2개 검사기법 모두가 간질환의 특성 및 검출과 그 질환에 따른 조영제 특성을 잘 보여주었다. The purpose of this experiment is to know the relation of the detection and characterization of liver's diseases as comparison of finding at MR imaging using a Ferucarbotran (SPIO) and Gd-EOB-DTPA (Primovist) agents in diffuse liver disease. A total of 50 patients (25 men and 25 women, mean age: 50 years) with liver diseases were investigated at 3.0T machine (GE, General Electric Medical System, Excite HD) "with 8 Ch body coil for comparison of diseases and contrast's uptake relation, which used the LAVA, MGRE." All images were performed on the same location with before and after Ferucarbotran and Gd-EOB-DTPA administrations (p<0.05). Contrast to noise ratio of Ferucarbotran and Gd-EOB-DTPA in the HCC were $3.08{\pm}0.12$ and $7.00{\pm}0.27$ with MGRE and LAVA pulse sequence, $3.62{\pm}0.13$ and $2.60{\pm}0.23$ in the hyper-plastic nodule, $1.70{\pm}0.09$ and $2.60{\pm}0.23$ in the meta, $2.12{\pm}0.28$ and $5.86{\pm}0.28$ in the FNH, $4.45{\pm}0.28$ and $1.73{\pm}0.02$ in the abscess and ANOVA test was used to evaluate the diagnostic performance of each disease (p<0.05). In conclusions, two techniques were well demonstrated with the relation of the detection and characterization of liver's diseases.

시론(時論) - 원자력 에너지가 절대적으로 필요한 4가지 이유 - 한국 원자력산업의 미래와 에너지 안보 -

이재승,Lee, Jae-Seung 한국원자력산업회의 2017 원자력산업 Vol.37 No.7

차세대 광통신 기술의 개발 동향

이재승,박희갑,심창섭,Lee, Jae-Seung,Park, Hui-Gap,Sim, Chang-Seop 대한전자공학회 1990 전자공학회지 Vol.17 No.5

환자의 재현성을 위한 고정장치(Vac-lok) 제작과 방사선치료에서 유용성 평가

이재승,김경희,정규환,권대철,구은회,박철우,임인철,동경래,정운관,Lee, Jae-Seung,Kim, Gyoung-Hee,Jeong, Kyu-Hwan,Kweon, Dae-Cheol,Goo, Eun-Hoe,Park, Cheol-Woo,Im, In-Chul,Dong, Kyung-Rae,Chung, Woon-Kwan 대한방사선방어학회 2011 방사선방어학회지 Vol.36 No.1

방사선치료에서 특수한 체형을 갖거나 특별한 자세가 요구되는 환자에게 적용할 수 있으며 환자의 위치결정 및 조사영역 내에서 표적체적의 위치 재현성을 향상시킬 수 있는 고정 장치(Vac-lok)를 제작하고 그 유용성을 검증하였다. EVA 합성수지와 1.5 mm 바이오 비드폼을 이용하여 제작된 Vac-lok의 기능적, 형태적 검사를 시행하고 모형 및 환자의 상대적 재현성을 분석하였다. 전 방사선치료 기간 동안 제작된 Vac-lok의 기능적 검사에서 미소한 진공 압력의 변화는 있었으나 무시할 정도로 작았다. 모형의 상대적 재현성은 기존 상품화된 제품보다 재현성이 향상되었으며 평균 4% 미만의 오차를 보였다. 또한 환자의 상대적 재현성에서 전후 또는 측면방향에서 다소 오차가 증가하였으나 최대 ${\pm}\;2.3$ mm 미만이었다. 결론적으로 방사선치료의 한계 오차를 ${\pm}\;3$ mm 미만이라 할 때 임상적으로 충분하게 사용 가능하였고 재현성의 향상과 특수한 환자에게 맞춤형 고정 장치를 가격이 저렴하면서 신속하게 제공할 수 있을 것으로 사료된다. We manufactured the Vac-lok that can be applied to patient of special body shape and need to special set-up position and evaluated the usefulness in the radiation therapy. The manufacture Vac-lok, It was used EVA resin and biobeadform of a diameter 1.5 mm. carried out the test of functionality, structural and analyzed the relative reproducibility of phantoms and patients. During the total period of radiation therapy, Vacuum pressure bring variety to a very small amount in the test of functionality of the manufacture Vac-lok. But It was a negligible quantity. The manufacture Vac-lok improved the relative reproducibility of phantoms than the existing Vac-lok and tolerance has a confidence less than 4% error. Also, relative reproducibility of patient increased error than phantom in the antero-posterior and lateral plan. However, the maximum set-up error was less than ${\pm}\;2.3$ mm. In conclusion, If tolerance set-up error of radiotherapy is less than ${\pm}\;3$ mm, the manufacture Vac-lok was enough possible to use and improvement of reproducibility, considering supply with the Vac-lok made to measure of special patient that produced at a low price and without delay.