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Sang‑Wook Kim,Hyeon‑Woo Son,Taek‑Kyun Jung,Young‑Bum Chun,Yi‑Hyun Park,Ji‑Woon Lee,Soong‑Keun Hyun 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
The hot deformation behavior of advanced reduced-activation alloy (ARAA) was investigated using hot torsion tests. Thefl ow stress decreased as deformation temperature increased and as strain rate decreased. The fl ow behavior demonstratedthe typical dynamic recrystallization (DRX). Based on the constitutive analysis of peak stress, the activation energy for hotdeformation was found to be 330.3 kJ mol −1 . Peak stress was analyzed as a function of the Zener–Hollomon parameter, andcalculated and experimental values were in good agreement. A DRX kinetic model for ARAA was derived with deformationconditions based on the Avrami-type model. It was confi rmed that the volume fraction of dynamically recrystallized grainsincreased as deformation temperature increased and as strain rate decreased. The necklace structure and grain boundarybulging were observed in the deformed microstructure of ARAA. The suggested DRX mechanism for ARAA during hotworking is discontinuous DRX.
Ji‑Hyun Kim,Sang Youp Hwang,Jung Eun Park,Gi Bbum Lee,Ho Kim,Seokhwi Kim,Bum Ui Hong 한국탄소학회 2019 Carbon Letters Vol.29 No.3
To prepare activated carbon with a high specific surface area, oxygen functional groups (OFGs) that can serve as useful electron donors during KOH activation were treated with nitric acid and incorporated into activated carbon. OFGs are incorporated differently according to the surface characteristics of starting materials. Up to 22.46% OFGs are incorporated into wood-based activated carbons (WACs), the C=O, COOH contents was 1.90, 17.05%, respectively. Whereas up to 12.82% OFGs are incorporated into coconut shell-based activated carbons, the C=O, COOH contents was 4.12, 6.15%, respectively. The OFGs used for increasing the specific surface area are the carbonyl group, and as the content of the functional group increases, the carbonyl group spreads to the carboxyl group. The specific surface area of activated carbons increased by 10–68% with an increase in the carbonyl group up to 6% (maximum point of carbonyl group). On the other hand, the specific surface area for WACs increased when the carboxyl group was 10% or below, but decreased by 6–15% when it increased to 10% or excess.
고속도로 IC 및 JCT 주변 유휴부지의 물류시설 활용가능성 분석 : 수도권 및 지방광역시를 중심으로
양현지(Yang, Hyun-Ji),최재성(Choi, Jae-Sung) 한국물류학회 2021 물류학회지 Vol.31 No.2
최근 코로나 19 등의 감염병으로 인한 비대면 활동 증가로 인터넷, 모바일 등을 통한 이커머스 택배 이용건수가 증가하며 택배업체 등의 물류시설 부지 확보 수요가 점점 증가하는 추세이다. 업체별로 필요한 부지를 연도별 임계치 수준에서 수급하며 적게는1천 평에서 많게는 1만 평 이상의 부지가 추가적으로 필요하므로 부족한 부지를 현재와 같이 부동산업체 등을 통해 사적영역에서확보하는 것은 지속가능성의 한계에 직면할 것으로 보인다. 본 연구에서는 수도권(서울, 인천, 경기도) 및 지방광역시(대전, 대구, 광주, 울산, 부산)를 중심으로 공공 부문의 도시계획시설 측면에서 가장 넓은 유휴부지의 확보가 가능한 고속도로 IC/JCT 교통광장 유휴부지의 부지현황⋅활용가능성을 분석하였다. 분석방법 및 내용으로 다음 카카오맵의 로드뷰, 스카이뷰 등을 활용해 연구대상지의 유휴부지를 전수조사 후 사업지 내 이면도로 등의 존재 유무에 따라 단기 및 중⋅장기적 사업 우선순위화 분류, 국가물류통합정보센터 내 물류단지 건립계획을 이용해 택배업체의 허브 및 서브터미널 건설 시 예상 사업비 분석, 한국은행의 산업연관표를 적용해 경제적 파급효과 등의 결과를 도출하였다. 도출된 유휴부지를 택배업체 등에서 활용하기 위해서는 IC/JCT 교통광장대부분의 지역이 현재 「국토계획법 시행령 제71조」에 의해 생산⋅자연녹지 용도지역인 상황을 고려하면 「건축법 시행령 별표1」 의 ‘18.창고시설 중 물류터미널’을 추가하는 방안, 「도로법」내 교통광장의 설치 및 관리에 관한 규정을 신설하거나 박성중 의원등 10인이 제안하여 위원회 심사 중인 「도로공간의 입체개발에 관한 법률안」의 본회의 통과를 통한 입법화를 완료해 법적 근거마련이 필요한 상황으로 보인다. 향후 법제도 개선을 통해 고속도로 IC/JCT의 유휴부지(총 183만평-수도권 140만평, 지방광역시43만평) 중 수도권은 약 12%, 지방광역시는 약 10% 정도만이라도 활용 가능하다면‘19년 한국통합물류협회의 18개 택배사업자가제시한 물류시설 구축을 위한 유휴부지 마련 수요를 충족시켜 부지확보의 어려움이 일정 부분 해소될 수 있을 것으로 추정한다. As contact-free activities have increased due to infectious diseases such as COVID-19, the number of delivery-related services has also increased through the rise of e-commerce. As such, the demand for securing sites for logistics facilities is rising as well. Each delivery company keeps supply and demand in balance at the annual threshold level, which means that they require additional land ranging from 3,300m2 (1,000 pyeong) to as much as 33,000m2 (10,000 pyeong). However, it is unreasonable to continuously secure land to meet demands from private areas through real estate companies, as is the current standard procedure done by delivery companies. This study analyzes the feasibility of securing unused land in its current state, focusing on unused sites in expressways IC/JCT, where the widest unused land, in terms of urban planning facilities can be found, mainly in the capital region (Seoul, Incheon, Gyeonggi-do) and provincial metropolitan cities (Daejeon, Daegu, Gwangju, Ulsan, Busan). Full-scale inspection of unused land near expressways is first conducted using Kakao Map’s Road View and Sky View, and the results, such as short-term or mid to long term business priorities, are derived depending on whether backside roads exist or not. Estimated business expenses are calculated using information of logistics center from the National Logistics Integrated Information Center, and economic effects of building hubs and sub-terminals for delivery companies in the unused land are also drawn, applying the Leontief input-output table from the Bank of Korea. Most unused land such as those surrounding roundabouts near expressways IC/JCT is considered as productive green areas and natural green areas in accordance with Article 71 of 「Enforcement Decree of the National Land Planning and Utilization Act」, so clause 18, which states “logistics terminal amongst storage facility field”, of schedule 1 in 「Enforcement Decree of Building Act」 should be added to the Article to loosen restriction on construction in areas surrounding roundabouts. Also, regulations on the installation and management of roundabouts in the 「Road Act」 should be established to allow delivery company to utilize the unused land derived through this analysis. Preparation of a legal basis is deemed necessary by passing legislation through the plenary session for 「The Bill on the Development of Three-dimensional Road Space」 under examination made by 10 lawmakers, including Park Sung-joong. If approximately 12% of the total unused land in expressways IC/JCT in the capital region and approximately 10% in provincial metropolitan cities are made available by improving the legal system in the future, demand of 18 delivery companies from Korea Logistics Association will be met. Through this, it is estimated that the difficulty of securing sites for logistics facility construction would be partially resolved.
Signed-DLMS 적응 알고리즘 이용한 무선 중계 간섭 제거기
유태훈(Tae-Hoon Yoo),우대호(Dae-Ho Woo),김주완(Dae-Ho Woo),하성희(Sung-Hee Ha),반지훈(Ji-Hun Van),이종현(Jong-Hyun Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we study the signed- DLMS adaptive algorithm of wireless repeater for solving shadow region due to propagation between base station and mobile station. The the signed-DLMS algorithm reduces interference signals from multipath and solves the oscillation problem of repeater by estimation and cancellation. To efficiently reject interference signal. the signed-DLMS adaptive algorithm is applied. The computational complexities of the signed-DLMS are reduced verse standard LMS algorithm. Wireless ICS repeater based on signed-DLMS reduces the cost and is able to increase channel capacities.
김주필(Joo Pil Kim),김대희(Dae Hee Kim),지승환(Seung Hwan Ji),지성현(Sung Hyun Ji) 한국거미연구소 2017 한국거미 Vol.33 No.2
2017년 7월 4일부터 6일까지 경상남도 거제시 거제도 일대를 김주필, 김대희, 지승환, 지성현, 최라미, 이영경 등 한국거미연구소 회원들이 주야로 채집한 결과, 총 23과 56속 75종이 조사 연구되어 이에 발표하는 바이다. 채집한 표본은 주필거미박물관에 보관하였다. From July 4 to 6 in 2017. Joo-Pil Kim, Dae-Hee Kim, Seung-Hwan Ji, Sung-Hyun Ji, Ra-Mi Choi, Yeong-Gyeong Lee, the members of The Arachnological Institute of Korea investigated the spiders in the whole area of Geoje city, Geoje-do, Gyeongsangnam-do and report 23 Family 56 Genus 75 Species of spiders. The collected spiders are placed (stored) in the Joo-Pil Spider museum.
Prediction of skin penetration of Bifenthrin using in vitro micro-pig skin model
Ji-Hyun Bang(Ji-Hyun Bang),Hyun-Ok Ku(Hyun-Ok Ku),Byung-Suk Jeon(Byung-Suk Jeon),Hyobi Kim(Hyobi Kim),Kwang-Jick Lee(Kwang-Jick Lee),Yong-Sang Kim(Yong-Sang Kim),Hee Yi(Hee Yi) 한국예방수의학회 2019 한국예방수의학회 학술대회자료집 Vol.2018 No.-
( Hyun Ji Kang ),( Ho Jeong Shin ),( Seung Hwan Paik ),( Young Jae Kim ),( Chong Hyun Won ),( Sung Eun Chang ),( Mi Woo Lee ),( Jee Ho Choi ),( Woo Jin Lee ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2
Background: Cutaneous posttransplatation lymphoproliferative disorder (PTLD) is rare, therefore the characteristics of this were not fully understood. Objectives: We analyzed and compared the clinical features and survival datas between cutaneous and extracutaneous postransplatation lymphoma (PTL) to improve the understanding of the cutaneous presentation of PTL. Methods: We searched the Asan Medical Center database for cases of PTL among 14490 postransplantation recipients. Clinical features and survival outcomes were analyzed and compared between cutaneous and extracutaneous PTL. Results: We identified 115 patients with PTL. Of these, 104 and 11 patients were extracutaneous and cutaneous PTL, respectively. T-cell lineage lymphoma were more common in cutaneous PTL (8/11, 73%) than extracutaneous disorders (17/104, 16%). Time interval from transplantations to PTL was significantly longer in cutaneous PTL (66.8 months) compared to extracutaneous PTL (56.3 months). Positivity for Epstein Barr virus (EBV) in cutaneous PTL (6/11, 55%) was lower than extracutaneous PTL (73/104, 70%). Conclusion: Cutaneous PTL have distinct characteristics compared to extracutaneous lesions. Cutaneous PTL are more commonly associated with EBV-negative, T-cell lineage lymphoma compared to extracutaneous lesions, However, prognosis of cutaneous PTL are similar to that of extracutaneous lesions.