Development Status of Rare Earth magnets for Vehicle Motors

Jaeryung Lee 한국자기학회 2019 한국자기학회 학술연구발표회 논문개요집 Vol.29 No.1

신소재 분말코어 적용 ISG시스템용 오일펌프모터개발

이재령(Jaeryung Lee),김성진(Seong Jin Kim),박현달(Hyundal Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

This paper describes the weight reduction technology of brushless DC (BLDC) motor with both advanced magnetic powder core instead of Si sheet steel core and copper cladding aluminum (CCA) instead of copper winding. In order to apply the high-density magnetic core for BLDC motor, the warm compaction process with die wall lubrication was used in this work. In general, the density of magnetic core is strongly associated with the core loss. The motor efficiency was improved as the magnetic core density was increased. Results showed that the oil pump motor using the advanced magnetic powder core was decreased about 10% in size and reduced about 10% in weight comparing to the convention motor with Si sheet steel core. Consequently, the motor and oil pump system containing the advanced powder core was satisfied the requirements during the performance and durability test.

Enhancement of coercivity of Nd–Fe–B sintered magnets by grain boundary diffusion of LRE-Al-Cu (LRE=Nd, Pr, La, Ce) low melting alloy

Ye Ryeong Jang,Hyungju Lee,Jaeryung Lee,Hyun-Sook Lee,Wooyoung Lee 한국자기학회 2022 한국자기학회 학술연구발표회 논문개요집 Vol.32 No.2

Enhancement of magnetic properties of Nd–Fe–B sintered magnets by grain boundary diffusion of LRE-Al-Cu(LRE=Nd, Pr, La, Ce) low melting alloy

Ye Ryeong Jang,Hyungju Lee,Jaeryung Lee,Hyun-Sook Lee,Wooyoung Lee 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.1

Grain Boundary Diffusion of La Based Low-melting Alloy to Nd-Fe-B Sintered Magnets

Ye Ryeong Jang,Hyungju Lee,Jaeryung Lee,Hyun-Sook Lee,Wooyoung Lee 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1

The high-performance Nd-Fe-B magnets have been widely used in many different applications, such as motors, generators, actuators, hard disk drives, and communication devices, since their discovery in 1894. In order to improve the performance of Nd-Fe-B magnets, grain boundary diffusion process is carried out by using heavy rare-earth element (HRE) such as Dy or Tb. Many efforts have been made to prepare high-performance Dy/Tb diffused Nd-Fe-B sintered magnets. However, these heavy rare-earth elements (Dy, Tb) have a problem that prices and supply are unstable. In this study, we have investigated the magnetic properties of Light rare-earth element (LRE) diffused Nd–Fe–B magnets. The alloys containing less expensive rare-earth element and low-melting metals work effectively as diffusion sources. Metals or compounds with low melting points can modify boundary structure by improving the wettability between intergranular phases and matrix phases. La based alloys effectively diffused along grain boundary phases and formed non-ferromagnetic phases, improving exchange decoupling and enhancing the coercivity. In order to analyze the microstructures, we use scanning electron microscopy. It is expected to provide solutions for cost reduction of GBDP and NdFeB magnets production by saving rare-earth resource. (See text for figure)

Intravitreal Tanibirumab, a Fully Human Monoclonal Antibody Against Vascular Endothelial Growth Factor Receptor 2, Partially Suppresses and Regresses Laser-Induced Choroidal Neovascularization in a Rat Model

Kim, Jaeryung,Kim, Tae Eun,Kim, Ju-A,Yun, Ji-Hyun,Sohn, Seongsoo,Shim, Sang Ryeol,Lee, Sang Hoon,Kim, Sang Jin MARY ANN LIEBERT, INC 2014 JOURNAL OF OCULAR PHARMACOLOGY AND THERAPEUTICS Vol.30 No.10

<P>Purpose: The study investigated the effect of intravitreally administered tanibirumab, a fully human monoclonal antibody against vascular endothelial growth factor receptor 2, in a rat model of laser-induced choroidal neovascularization (CNV). Methods: CNV was induced by laser photocoagulation on day 0 in the eyes of Brown Norway rats. Intravitreal injection of tanibirumab or phosphate-buffered saline (PBS) was done on day 0 (prevention arm) or day 7 (treatment arm). Seven days after injection, the eyes were enucleated and retinal pigment epithelium-choroid-sclera flat mounts were prepared. Areas of CNV were determined in the flat mounts using tetramethylrhodamine isothiocyanate Bandeiraea simplicifolia (BS) isolectin labeling and intravenously administered fluorescein isothiocyanate-dextran and quantified using an image analysis program. Results: In the prevention arm, the mean area of CNV measured by BS isolectin labeling was reduced by 28.2% and 53.9% in tanibirumab-treated eyes (20 and 60 mu g, respectively) compared with PBS-treated control eyes on day 7 (P=0.038 and P<0.001, respectively). In the treatment arm, the mean area of CNV measured by BS isolectin labeling was reduced by 28.7% and 46.0% in tanibirumab-treated eyes (20 and 60 mu g, respectively) compared with PBS-treated control eyes on day 14 (P=0.048 and P<0.001, respectively). Conclusions: Intravitreally administered tanibirumab partially suppressed the formation of new CNV and partially regressed preformed laser-induced CNV in the rat model. Tanibirumab may be a feasible treatment for CNV associated with age-related macular degeneration or other causes.</P>

국내 유휴공간재생관련 연구 비교분석을 통한 지속가능한 재생 방향 연구 -2000년 이후의 연구를 중심으로-

신재령 ( Shin Jaeryung ),이정교 ( Lee Junggyo ) 한국공간디자인학회 2021 한국공간디자인학회논문집 Vol.16 No.3

(연구배경 및 목적) 최근 도시들은 급변하는 산업구조로 인해 유휴공간문제에 당면했고, 이를 컬처노믹스의 개념(문화와 산업을 창조적으로 융합)을 적용한 문화적 재생으로 해결하고 있다. 이러한 계획은 시민의 삶의 질 향상뿐만 아니라 지역을 활성화하는 차별화된 부가가치 창출을 목표로 하고 있으나 일부 사례는 방문객의 재방문을 이끌어 내지 못하면서 궁극적으로 지속가능성의 문제가 제기되고 있다. 그러므로 본 연구의 목적은 유휴공간재생관련 국내 논문의 주제, 시기, 분야, 내용 그리고 연구유형별 특성 등을 양적·질적으로 비교분석함으로써 유휴공간재생을 위해 필요한 지속가능한 재생의 방향을 도출하는 것이다. (연구방법) 첫째, 이론적 고찰을 통해 유휴공간재생의 개념 및 흐름을 파악하고, 양적·질적 비교분석을 위해 2000년부터 2019년까지 국내에서 발간된 석·박사 학위논문 및 각종 학술지논문을 검색한다. 이 중 이론적 고찰을 통해 추출된‘유휴(비활성화 의미)’와 ‘재생(전환가치 의미)’을 키워드로 하는 169편을 연구의 대상으로 선정하여(연구정보공유서비스 RISS및 누리미디어 DBpia, 한국학술정보 KISS 등 검색서비스 활용) 주제어별, 분야별, 시기별 특성들을 추출하는 양적분석을 실시한다. 둘째, 앞의 양적분석에서 특정분야의 특징적 변화를 보이는 2014년 이후의 학위논문 57편을 대상으로 연구유형과 유형별 세부내용 및 특성을 도출하는 질적 분석을 실시한다. 셋째, 이러한 양적·질적 비교분석을 통해 시대변화에 따른 연구의 동향을 파악하고 연구유형별 핵심요소를 도출하여 향후 유휴공간재생의 방향을 도출한다. (결과) 첫째, 지난 20년간 유휴공간재생과 관련해 국내에서 발표된 연구는 건축, 디자인 분야가 70%이상을 차지하며 2014년 이후 디자인분야와 건축분야의 연구량이 역전되었고, 빈도가 가장 높은 주제어는 문화와 산업시설이었다. 둘째, 연구의 유형은‘운영 및 프로그램 연구’, ‘공간조성 연구’, ‘평가지표 연구’, ‘비즈니스 연구’의 4가지이며 각각의 세부특성을 도출하였다. 셋째, 문헌연구와 사례자료 분석 등의 개념연구로부터 탈피하여 방문객 및 운영자 현장조사와 통계를 통한 실증적 연구가 증가하고 있다. (결론) 현재 유휴공간재생의 화두는 다시 환원되지 않도록 하는 지속가능성의 확보에 있다. 이를 위해 본 연구는 컬처노믹스 공간으로서 시민의 삶의 질 향상 및 지역 활성화를 이끄는 유휴공간재생에 있어 지속가능성 실현을 위해 연구유형별 세부특성을 종합적으로 적용하여 시대변화에 따라 다양해지는 재생 공간 사용자 가치를 기반으로 하는 전략적인 접근이 필요함을 밝히고 향후 실증적인 유휴공간재생전략의 수립을 위한 기초자료로 활용하고자 한다. (Background and Purpose) Recently, changes in industrial structure have created the problem of idle space in cities, which has been addressed by cultural regeneration, applying the concept of culturenomics (creative convergence of culture and industry). These plans aim to create differentiated value-addition, which not only improves the quality of life of citizens but also revitalizes the region; however, some cases have failed to attract visitors, raising the issue of sustainability. Therefore, this study attempts to understand the direction of sustainable regeneration, which is necessary for idle space regeneration, by quantitatively and qualitatively analyzing the subject, timing, field, contents, and characteristics of domestic papers on idle space regeneration. (method) First, we identify the concept and flow of idle space regeneration through theoretical considerations, and use master's and doctorate papers and various academic journals published in Korea from 2000 to 2019 for quantitative and qualitative comparative analysis. The keywords of the theoretical considerations were 'Idle' (meaning deactivation) and 'Regeneration' (meaning of conversion value). Using this, it selects Flight 169 as the subject of research (using search services such as RISS and Nuri Media DBpia, Korean Academic Information KISS) and conducts quantitative analysis to extract characteristics by topic, field, and time. Second, in the previous quantitative analysis, 57 post-2014, degree papers that show characteristic changes in a particular field are qualitative analyses, which derive the details and characteristics of each type of study. Third, through these quantitative and qualitative comparative analyses, we identify trends in research as the times change and derive key elements for each type of research to understand the direction of future idle space regeneration. (Results) First, domestic research on idle space regeneration over the past 20 years has accounted for more than 70% of the architecture and design sectors, with the number of studies in the design and architecture sectors reversed since 2014, with the most frequent topics being culture and industrial facilities. Second, four types of research, “Operation and Program Studies,” “Spatial Composition Studies,” “Assessment Indicators Studies,” and “Business Studies,” which derive their respective detailed characteristics. Third, empirical research through on-site surveys and statistics of visitors and operators is increasing, breaking away from conceptual research such as literature research and case data analysis. (Conclusions) Currently, the focus of idle space regeneration is on securing sustainability to prevent it from reversion. Therefore, this study reveals the need for a strategic approach based on the user value of renewable space that varies with the times and uses it as basic data for establishing empirical idle space regeneration strategies in the future.

The Effectiveness of Cognitive Behavioral Therapy on Depressive Symptoms in North Korean Refugees

Jeon Sehyun,Lee Jiyoun,Jun Jin Yong,Park Young Su,Cho Jaehee,Choi Jaeryung,Jeon Younsuk,Kim Seog Ju 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.7

Objective Despite the growing need for psychological programs for North Korean refugees, most psychological interventions for these people lack a verification study that tests their effectiveness. This study aims to evaluate the effectiveness of cognitive behavioral therapy (CBT) in North Korean refugees.Methods Participants included 38 North Korean refugees, of whom 23 participated in simple relaxation and 15 participated in CBT. The Korean version of the Center for Epidemiologic Studies Depression Scale (CES-D), State-Trait Anxiety Inventory-State (STAI-S), and Impact of Event Scale-Revised were used to evaluate symptoms pre- and post-intervention.Results Participants had a significant decrease in CES-D scores after treatment (p=0.037). The decrease in CES-D was larger in those who participated in the CBT compared to those in simple relaxation (p=0.023). The superior effects that CBT had on depressive symptoms over simple relaxation were particularly more prominent in those with severe depression (p=0.035). Participants with high levels of anxiety also showed significant decreases in STAI-S scores after treatment, regardless of which type of program they participated in (p=0.023).Conclusion This preliminary findings suggests that CBT is an effective psychiatric approach in treating depressive symptoms in North Korean refugees, especially for those with a higher degree of depressive symptom.

유휴산업시설의 장소자산화를 통한 도시브랜딩 전략

신재령 ( Shin Jaeryung ),이정교 ( Lee Junggyo ) 한국공간디자인학회 2020 한국공간디자인학회논문집 Vol.15 No.7

(연구배경 및 목적) 현대의 급속한 세계화 속에서 도시의 경제적 경쟁은 관광산업의 확대로 이어져‘장소’를 소비의 중심지로 만들었고 도시의 경쟁력 측면에서 매력적인 ‘장소’는 흡인력 있는 도시브랜드의 자산요소로 여겨지게 되었다. 특히, 이전 시대에 사용했던 유휴산업시설은 환경악화와 기후변화의 시대에 도시문제로 대두되면서 경쟁력 있는 장소자산으로 탈바꿈이 요구되고 있다. 장소자산 으로서 의미 있는 도시브랜드가 되기 위해서는 도시를 살아가고 경험하는 도시고객의 가치 이해를 바탕으로 구축되며 지속적 매니지먼트로 브랜딩 되어야한다. 따라서 본 연구는 유휴산업시설의 장소자산화를 위한 가치요인을 추출하여 장소자산화를 통한 도시고객중심의 전략적 도시브랜딩 방향연구를 목적으로 한다. (연구방법) 본 연구는 선행연구를 통해 유휴산업시설 장소자산화의 가치요인들을 추출하였고, 이론적 고찰을 통해 도시고객중심의 전략적 도시브랜딩 방향을 도출하였다. 이를 기반으로 분석모형(안)을 제시하고 정량적·정성적 분석을 진행하였다. 특히 전문가평가를 통해 연구자의 분석을 검증하여 연구의 분석오차를 최소화하고자 하였다. 세계도시경쟁력 평가 최상위국가인 런던, 뉴욕 및 파리, 중위권인 코펜하겐과 국내 대도시 서울, 부산을 대상으로 지난 20년 내 재생된 대표 장소 중 유휴산업시설의 유형별로 6곳을 분석하였다. (결과) 유휴 산업시설 장소자산화의 주요한 가치요인은 구축적 관점에서 맥락성·긍정성 및 관리적 관점에서 새로움·화제성이었으며, 도시 고객의 니즈를 중심으로 한 전략적 도시브랜딩 특성은 거주자애착가치 형성, 관광객 경험가치 관리, 사업가 투자가치 제고의 세가지 측면에서 분석하였다. 이를 통해 유휴산업시설 장소자산화의 구축적·관리적 가치요인 반영정도가 도시브랜딩에 영향을 미치는 것으로 분석되었다. (결론) 유휴산업시설은 고유한 맥락과 인간의 활동이 축적된 도시브랜드로서 잠재력을 가지며 장소 자산화를 통해 도시경쟁력의 충분한 자원이 될 수 있다. 본 연구는 유휴산업시설의 장소자산화가 독점적인 도시브랜드 구축 및 도시고객의 자긍심과 충성심을 이끌어내는 수단임을 밝히고자 하였다. 본 연구를 통해 유휴산업시설의 장소자산화가 도시경쟁력을 향상시키는 중요한 전략으로 인식되어 향후 도시브랜딩 계획의 활발한 시도에 기초적인 자료가 되기를 기대한다. (Background and purpose) Amid contemporary rapid globalization, the city’s economic competition has led to an expansion of the tourism industry, making the “place” a center of consumption, and in terms of the city’s competitiveness, it has become an asset component of the attractive urban brand. In particular, idle industrial facilities used in the previous era have emerged as urban problems in the era of environmental degradation and climate change, which have been required to be transformed into competitive place assets. To become a meaningful urban brand, as a place asset, it must be built on the basis of the value understanding of urban customers living and experiencing the city and be branded as a continuous management. Therefore, the purpose of this study is to present a strategic urban branding study centered on urban customers through place assetization by extracting value factors for place assetization of idle industrial facilities. (Method) This study extracted the value factors of place assetization of idle industrial facilities through prior studies, and derived the strategic urban branding directions of urban customer-centeredness through theoretical consideration. Based on this, the analysis model (proposal) was presented and quantitative and qualitative analysis was conducted. Further, expert evaluation was conducted to verify the analysis. Six of the representative sites that have been regenerated within past 20 years were analyzed for each type of idle industrial facilities, including in London, New York, and Paris, which are the top countries in the global urban competitiveness rankings, Copenhagen, which is ranked in the middle, and Seoul and Busan, the nation’s largest cities. (Results) The main value factors of the assetization of idle industrial facilities were contextuality, positivity, novelty, and topics from a constructive perspective, and the strategic urban branding characteristics centered on the needs of urban customers were analyzed in three aspects: formation of residential affection value, management of tourist experience value, and enhancement of business investment value. As a result, it was analyzed that the degree of reflection of the constructive and managerial value factors of the place assetization of idle industrial facilities affects urban branding. (Conclusions) Idle industrial facilities have potential as urban brands with unique context and accumulated human activities, and through place assetization, can be converted into sufficient resources for urban competitiveness. The study intended to clarify that the place assetization of idle industrial facilities would be a means to establish an exclusive brand and induce pride and loyalty from urban customers. Through this study, we hope that the location assetization of idle industrial facilities will be recognized as an important strategy to improve urban competitiveness and serve as basic data for the active attempt of urban branding plans in the future.

아메드방수유출장치 삽입술 후 발생한 조직 감입

김재령,이정민,기창원,Jaeryung Kim,MD,Jeongmin Lee,MD,Changwon Kee,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.7

Purpose: To report cases of intraocular pressure that was normalized, after removing the capsule that had incarcerated into the valve after Ahmed valve implantation. Case summary: A 34-month-old boy visited our clinic for elevated intraocular pressure of the right eye. The patient had received Ahmed valve implantation 1 year earlier. At the first ophthalmological examination in our hospital, intraocular pressure of the right eye measured by Perkins tonometer was 28 mm Hg using Cosopt? and Iopidine?, and 26 mm Hg after additional digital massage; the authors decided to remove the capsule with surgery. The fibrotic tissue was removed after finding the tissue incarcerated into the valve during the operation. One day after the surgery, without using any glaucoma medication, intraocular pressure of the right eye measured by Perkins tonometer was 15 mm Hg. Three months after surgery, using topical intraocular pressure lowering agents, intraocular pressure of the right eye was 18 mm Hg. Because the intraocular pressure of other patients after Ahmed valve implantation was not regulated well, surgery was performed, and the fibrotic tissue was removed after finding the tissue incarcerated in the valve during the operation. J Korean Ophthalmol Soc 2012;53(7):1053-1056