카메라 렌즈 평가용으로 제작된 nodal slide식 실시간 OTF 측정 장치

이지영,송종섭,조재흥,장수,임천석,이윤우,이인원,Lee, Ji-Young,Song, Jong-Sup,Jo, jae-Heung,Chang, Soo,Rim, Cheon-Seog,Lee, Yun-Woo,lee, In-Won 한국광학회 2002 한국광학회지 Vol.13 No.2

A real-time OTF (optical transfer function) measuring system with on- and off-axis nodal slide bench type for the camera lens is fabricated and evaluated. It consists of a nodal slide bench including a T-bar for the OTF measurement of an off-axis object, two dimensional CCD (charge coupled device) with pixel of 9.9${\mu}{\textrm}{m}$$\times$9.6${\mu}{\textrm}{m}$ for real-time OTF measurment, and a collimating lens of focal length of 300 mm for the optimization of this system. The OTF system is corrected by using the OTF of a SIRA lens of fnumber of F/8 and focal length 50 mm. In order to confirm the reliability of the OTF system, two MTFs (modulus transfer functions) of CCTV & VIDEO lens (JAPAN, AVENIR-SE 2514) of focal length of 25mm and field of view 10.6$^{\circ}$are measured by the camera bench type OTF system of reference OTF system and the nodal slide bench type OTF system and compared with each other. As a result, these two values are agree well with each other within 4% from 0 1p/mm to 100 1p/mm. 초측정 할 수 있는 nodal slide식 실시간 OTF 측정 장치를 제작하였다. 비축 물체를 측정하기 위하여 nodal slide와 T-bar를 사용하고, 실시간 측정을 위하여 화소 간격이 가로 9.9$\mu\textrm{m}$와 세로 9.6$\mu\textrm{m}$인 2차원 CCD(charge coupled device)를 사용하며, 초점 길이 300mm의 시준 렌즈를 사용하여 장치를 소형화하였다. 그리고 F/8, 초점 길이 50 mm인 SIRA사의 표준 렌즈를 이용하여 측정 장치의 정확도를 평가하고 보정하였다. 본 장치의 신뢰도를 위하여 시야각이 10.6$^{\circ}$이고, 초점 길이가 25.0mm인 CCTV & VIDEO 렌즈(JAPAN, AVENIR-SE 2514)의 MTF를 측정하여 카메라 벤취(bench)형 OTF측정 장치로부터 구한 MTF 값들과 상호 비교한 결과 대부분의 공간주파수에서 4% 이내로 일치하였다.

주성분 분석을 이용한 펄스형 전자기장 자극을 통해 DNCB로 유발된 아토피성 피부염의 개선 효과 분석

이지영,김준영,이예린,김고은,이용흠,양세정,Lee, Jiyoung,Kim, Jun-Yong,Lee, Yerin,Kim, Ko Eun,Lee, Yongheum,Yang, Sejung 대한의용생체공학회 2021 의공학회지 Vol.42 No.3

Atopic dermatitis (AD), a chronic inflammatory skin disease, is characterized by itchy and age-dependent lesions. Previous studies have shown that pulsed electromagnetic field (PEMF) significantly improved chronic ulcers and ununited fractures, providing an evidence for the application of PEMF in resolving inflammation caused by AD. This study investigated the anti-inflammatory effect of PEMF on DNCB-induced AD in animal models. Five male hairless mice (6 weeks old) per group were assigned to a normal group, a sham group, and two PEMF groups (15Hz, 75Hz). Mice were treated with 2,4-Dinitrochlorobenzene (DNCB) to induce uniform AD among all groups excluding a normal group. To examine the inflammatory progress and the improvement of AD after the PEMF stimulation, images are taken with various cameras for non-invasive evaluation and the results are expressed using principal component analysis (PCA) for visualization. The results of this study demonstrated that PEMF effectively improved skin lesions without the use of drugs.

대용량 에너지 저장장치용 2세대 고온 초전도 코일의 특성해석

이지영,이세연,김영일,박상호,최경달,이지광,김우석,Lee, Ji-Young,Lee, Seyeon,Kim, Yungil,Park, Sang Ho,Choi, Kyeongdal,Lee, Ji-Kwang,Kim, Woo-Seok 한국전력공사 2015 KEPCO Journal on electric power and energy Vol.1 No.1

대용량 초전도 에너지저장장치(Superconducting Magnetic Energy Storage, SMES)용 초전도 권선을 제작하기 위해서는 높은 자장특성을 가고 있는 2세대 고온초전도 (2nd Generation High-Temperature Superconductor, 2G HTS) 선재를 사용하는 것이 효율적이다. 자기에너지 저장 밀도를 높이기 위해서는 권선에 높은 전류밀도를 인가해야 하는데, 도체의 평면에 수직 방향으로 인가되는 자속밀도가 커지면 임계전류가 작아지는 2세대 HTS 선재의 특성상 토로이드 형태의 권선을 구성하는 것이 일반적이다. 이러한 고온초전도 권선을 설계하기 위해서는 권선 특성의 정확한 해석이 필요한데 이를 위해 유한요소법을 사용한 프로그램을 이용하여 해석이 가능하나 토로이드 형태의 권선은 대칭성의 문제로 3차원 해석을 해야만 하며, 이는 모델링에 많은 어려움과 높은 컴퓨터 사양, 그리고 매우 긴 계산 소요시간이 필요함을 의미한다. 본 논문에서는 이러한 문제점을 해결하기 위해 분석적이고 통계적으로 고온 초전도 코일에서 작용하는 최대 수직자장과 저장된 에너지를 결정하는데 이해하기 쉽고 효율적으로 계산하는 방법을 제시했다. 이 방법은 현저한 시간단축과 효율적인 설계를 할 수 있는 새로운 계산 방법으로 기존의 유한요소법에 의해 소요되는 계산 시간에 비해 1/1000정도로 계산시간 단축을 할 수 있었다. Large scale superconducting magnetic energy storage (SMES) system requires very high magnetic energy density in its superconducting coils to enhance the energy capacity and efficiency of the system. The recent high temperature superconducting (HTS) conductors, so called 2G conductors, show very good performance under very high magnetic field so that they seem to be perfect materials for the large scale SMES coils. A general shape of the coil system with the 2G HTS conductor has been a tor oid, because the magnetic field applied perpendicularly to the surface of the 2G HTS conductor could be minimized in this shape of coil. However, a toroid coil requires a 3-dimensional computation to acquire the characteristics of its critical current density - magnetic field relations which needs very complicated numerical calculation, very high computer specification, and long calculation time. In this paper, we suggested an analytic and statistical calculation method to acquire the maximum magnetic flux density applied perpendicularly to the surface of the 2G HTS conductor and the stored energy in the toroid coil system. Although the result with this method includes some errors but we could reduce these errors within 5 percent to get a reasonable estimation of the important parameters for design process of the HTS toroid coil system. As a result, the calculation time by the suggested method could be reduced to 0.1 percent of that by the 3-dimensional numerical calculation.

Zn₂SiO₄:Mn,Al 녹색 형광체의 제조와 발광특성

이지영,유일,Lee, Ji-Young,Yu, Il 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.4

[ $Zn_2SiO_4:Mn$ ] green phosphors doped with $NH_4Cl$ and Al for PDP were synthesized by solid state reaction method. The luminescence of 532 nm in $Zn_2SiO_4:Mn$ phosphors was associated with $^4T_1{\to}^6A_1$ transition. Photoluminescence intensity of $Zn_2SiO_4:Mn$ doped with $NH_4Cl$ 15 mol% increased about two times as compared with that of $NH_4Cl$ non-doped sample. The color of the emission of Al-doped $Zn_2SiO_4:Mn$ phosphors changed to yellowish green.

장기공공임대주택의 지속가능한 리모델링 유형 분석

이지영,윤영호,이지은,Lee, Ji-Young,Yoon, Young-Ho,Lee, Ji-Eun 한국토지주택공사 토지주택연구원 2013 LHI journal of land, housing, and urban affairs Vol.4 No.1

"장기공공임대주택 입주자 삶의 질 향상 지원법" 제 개정으로 공공임대주택 리모델링 및 증축동 신축을 위한 법적 근거가 마련되었다. 이같이 리모델링의 법적 기반이 마련됨에 따라, 앞으로 장기공공임대주택에 시행될 리모델링의 목표, 공간, 주기, 아이템, 프로세스 등에 대한 구체적 논의가 요구될 것이다. 이에, 본 연구는 장기공공임대주택 입주자의 삶의 질 향상에 중점을 둔 리모델링 유형 제안에 목적을 두고 있다. 또한, 제시된 리모델링 유형은 그 시행효과가 지속적으로 유지될 수 있도록 지속가능성 확보에 기반을 두고 있다. 이를 위해, 국내 영구임대주택의 현황 및 입주자의 요구를 파악하고, 선진 국가의 공공임대주택 리모델링 사례를 분석하여, 개선환경 별 주요 리모델링 목표를 도출하였다. 먼저, 국내 외 현황 분석은 장기공공임대주택 리모델링 과정에서 거주자의 삶의 질 향상 도모를 위한 포괄적인 리모델링 설정과 다양한 리모델링 유형 및 지속가능한 리모델링 적용이 요구됨을 시사하였다. 또한, 영구임대주택단지 입주자를 대상 설문조사로, 주택의 물리적환경개선(주택 및 시설 노후화 개선)과 사회적 환경개선(단지의 부정적 이미지 개선)과 관련된 거주자의 요구를 파악할 수 있었다. 그리고 이같이 분석된 결과를 기반으로 물리적 사회적 환경 개선요소를 도출하였으며, 7개의 지속가능한 리모델링 유형으로 유형화하였다. 이같이 제시된 리모델링 유형은 리모델링의 지속가능성 확보 및 입주자의 삶의 질 향상에 기여할 수 있을 것으로 기대한다. The remodeling of long-tern public rental housing (LPRH) have been acknowledged followed by the introduction of th Act of the Life Quality Improvement of the Residents in Long-tern Public Housing. Likewise, the feasible direction of LPRH remodeling should be discussed in order to improve the quality of life of the dwellers and housing facilities. Therefore a purpose of this study is to suggest the remodeling types for increasing their quality of life with regard to sustainability of remodeling. To do so this study employs various cases of public housing remodeling from the UK, France and USA and performed quantitative research that was subject to the residents in 9 LPRH in Seoul and Gyeong-gi. The findings of the analysis demonstrate that comprehensive and sustainable remodeling considering both physical and social environment factors are needed, and that the residents have needs of improvement of deteriorated facilities and negative perception of the public on LPRH. With regard to this, seven types of the LPRH remodeling types are drawn on the combination between physical and social environment factors. Thus it is expected that the types will ultimately be able to increase of the quality of the life of the residents and guarantee sustainable remodeling.

개 심장사상충 추출액 투여에 의한 Anaphylactoid Reaction

이지영,송근호,권현주,김명철,윤효인,김덕환,Lee, Jee-young,Song, Kun-ho,Kwon, Hyun-ju,Kim, Myung-cheol,Yun, Hyo-in,Kim, Duek-hwan 대한수의학회 2003 大韓獸醫學會誌 Vol.43 No.3

This study was performed to clarify the induction possibility of anaphylactoid reactions by the administration with the heartworm extracts, and, if any, to elucidate different virulences in terms of the protein concentrdtions and sexes of Dirofilaria immitis. Twenty three clinically healthy D. immitis-free adult dogs were used in the present study. The experimental animals were divided into 5 groups. Group A (5 heads) was administered with an female heartworm extract containing 0.1 g/dl protein concentration. Group B (4 heads) was administered with an male heartworm extract containing 0.1g/dl protein concentration. Group C (5 heads) was administered with an female heartworm extract containing 0.2 g/dl protein concentration. Group D (4 heads) was administered with an male heartworm extract containing 0.2 g/dl protein concentration. Group E (5 heads) was administered with an female heartworm extract containing 0.4 g/dl protein concentration. The changes of clinical symptoms and vital signs (body temperature, heart rate and respiration rate) were examined before and 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours and 24 hours after injection with the extracts, respectively. In addition, the changes of hematological values (RBC, PCV and total leukocytes counts), serum chemical values (ALP and CK) were determined. It was considered that heartworm extract could induce anaphylactoid reaction and adult female heartworm extract was more affective than those of adult male heartworm extract in the changes of clinical symptoms, vital signs, hematological values and serum chemical values.

SnO₂:Cu 나노 구조물의 CH₄, CH₃CH₂CH₃ 가스 감응 특성

이지영,유윤식,유일,Lee, Ji-Young,Yu, Yoon-Sic,Yu, Il 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.12

The effect of Cu coating on the sensing properties of nano $SnO_2:Cu$ based sensors for the $CH_4$, $CH_3CH_2CH_3$ gas was studied. This work was focussed on investigating the change of sensitivity of nano $SnO_2:Cu$ based sensors for $CH_4$, $CH_3CH_2CH_3$ gas by Cu coating. Nano sized $SnO_2$ powders were prepared by solution reduction method using stannous chloride($SnCl_2{\cdot}2H_2O$), hydrazine($N_2H_2$) and NaOH and subsequent heat treatment. XRD patterns showed that nano $SnO_2$ powders with rutile structure were grown with (110), (101), (211) dominant peak. The particle size of nano $SnO_2:Cu$ powders at 8 wt% Cu was about 50 nm. $SnO_2$ particles were found to contain many pores, according to SEM analysis. The sensitivity of nano $SnO_2:Cu$ based sensors was measured for 5 ppm $CH_4$ gas and $CH_3CH_2CH_3$ gas at room temperature by comparing the resistance in air with that in target gases. The sensitivity for both $CH_4$ and $CH_3CH_2CH_3$ gases was improved by Cu coating on the nano $SnO_2$ surface. The response time and recovery time of the $SnO_2:Cu$ gas sensors for the $CH_4$ and $CH_3CH_2CH_3$ gases were 18~20 seconds, and 13~15 seconds, respectively.

Sm 농도변화에 따른 백색 LED용 ZnS:Mn,Sm형광체의 발광특성

이지영,이상재,김태우,유일,Lee, Ji-Young,Lee, Sang-Jae,Kim, Tae-Woo,Yu, Il 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.1

ZnS:Mn yellow phosphors doped with Sm for white light emitting diodes were synthesized by solid state reaction method. These sample showed the characteristic X-ray diffraction patterns for main peak (110) of ZnS:Mn,Sm. Photoluminescence excitation spectra originated from $Mn^{2+}$ were ranged from 450 nm to 500 nm. The yellow emission at around 580 nm was associated with $^4T_1{\rightarrow}^6A_1$ transition of $Mn^{2+}$ ions in ZnS:Mn,Sm phosphors. The highest photolum inescence intensity of the phosphors under 405 nm and 450 nm excitation was obtained at Sm concentration of 1 mol%. The enhanced photoluminescent intensity in the ZnS:Mn,Sm phosphors was interpreted by energy transfer from Sm to Mn. The highest luminescent intensity of white LED was obtained at the epoxy-to-yellow phosphor ratio of 1:3. At this ratio, the CIE chromaticity of the white LED was X=0.3886 and Y=0.2928.

SnO₂ 나노 분말의 합성 및 가스 감응 특성

이지영,유윤식,유일,Lee, Ji-Young,Yu, Yoon-Sic,Yu, Il 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.7

[ $SnO_2$ ]nano powders were prepared by solution reduction method using tin chloride($SnCl_2{\cdot}2H_2O$), hydrazine($N_2H_4$) and NaOH. The $SnO_2$ thick films for gas sensors were fabricated by screen printing method on alumina substrates and annealed at $300^{\circ}C$ in air, respectively. XRD patterns of the $SnO_2$ nano powders showed the tetragonal structure with (110) dominant orientation. The particle size of $SnO_2$ nano powders at the ratio of $SnCl_2:N_2H_4$+NaOH= 1:6 was about 60 nm. The sensing characteristics were investigated by measuring the electrical resistance of each sensor in a test box. Sensitivity of $SnO_2$ gas sensor to 5 ppm $CH_4$gas and 5 ppm $CH_3CH_2CH_3$ gas was investigated for various $SnCl_2:N_2H_4$+NaOH proportion. The highest sensitivity to $CH_4$ gas and $CH_3CH_2CH_3$ gas of $SnO_2$ sensors was observed at the $SnCl_2:N_2H_4$+NaOH= 1:8 and $SnCl_2:N_2H_4$+NaOH= 1:6, respectively. Response and recovery times of $SnO_2$ gas sensors prepared by $SnCl_2:N_2H_4$+NaOH= 1:6 was about 40 s and 30 s, respectively.

진행성 대장직장암 환자군에 있어서 5-FU 혹은 capecitabine의 최적 시간 치료법에 대한 체계적 고찰 : 메타분석

이지영,오혜경,류한성,윤성우,Lee, Jee Young,Oh, Hye Kyung,Ryu, Han Sung,Yoon, Seong Woo 대한암한의학회 2015 大韓癌韓醫學會誌 Vol.20 No.1

Background : The purpose of this study is to investigate the efficacy and safety of the circadian delivery schedule of fluorouracil or capecitabine based chemotherapy for advanced colorectal cancer. Patients and methods : A meta-analysis was performed using individual data from eight international randomized clinical trials, especially phase II or III trials, comparing 5-fluorouracil, or capeticabine in chronomodulated or conventional schedule. The data from 8 studies was composed of 692 patients receiving chronomodulated chemotheray and 684 patients receiving conventional chemotherapy. The main end point was response rate. Results : Response rate was insignificantly different from each group (RR 1.14, 95%CI 0.74-1.74, p=0.55). Overall survival and progresseion-free survival were not significant either. Chemotherapy induced anemia, diarrhea, and nausea/vomiting were worse in the chronotherapy group, with statistic significance respectively. On the other hand, chemotherapy induced thrombocytopenia, stomatitis, peripheral neuropathy, and dermatotoxicity were better but they were not statistically significant results. Conclusions : Patients lived longer but not significantly on chronomodulated chemotherapy rather than on conventional chemotherapy. Patients on chronomodulated chemotherapy experienced adverse events more. The chronomodulated chemotherapy schedule needs adjustment of its delivery schedule and further research is required.