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Jang, Jinhee,Oh, Seonghyeon,Hahn, Jae W IOP 2017 Journal of micromechanics and microengineering Vol.27 No.4
<P>In this study, we develop an optical contact probe array for scanning near-field lithography. We fabricate the optical probes with a pyramidal tip array on an aluminium/silicon nitride composite membrane. Here, we reduce the contact pressure using the corrugations on the silicon nitride membrane and the flattened surface on top of the tip. After fabricating the 5 × 5 probes in the array, we evaluate the contact pressure using the force–distance curve obtained by an atomic force microscope. The spring constants of the corrugated membranes are 10 ± 0.6 N m<SUP>−1</SUP>. The contact pressure on a flattened 295 nm in-radius is calculated to be approximately 33 MPa for a 300 nm deflection. This value is 22 times smaller than that of a sharp pyramidal tip of 20 nm in-radius on a flat membrane.</P>
Structure and Antiinflammatory Activity Relationships of Wogonin Derivatives
Jinhee Jang,김현표,Haeil Park 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.8
A number of wogonin derivatives have been synthesized as congeners of wogonin and evaluated for their inhibitory activities of PGE2 production. Wogonin derivatives modified at the B ring of wogonin were obtained from 2,4-Dihydroxy-3,6-dimethoxyacetophenone (1) via several steps. Most wogonin derivatives exhibited much reduced inhibitory activities against COX-2 catalyzed PGE2 production compared to that of wogonin. Alkylation of 5,7-phenol groups and substitution at the B ring of wogonin generally caused reduction of inhibitory activity.
노화 및 인지기능장애에서 뇌 철 영상 기법: 자기공명영상을 이용한 접근
Jinhee Jang,Junghwa Kang,Yoonho Nam 대한영상의학회 2022 대한영상의학회지 Vol.83 No.3
철은 중추신경계 및 인체에 필수적인 성분으로 노화 및 다양한 퇴행성 뇌질환에서 뇌의 철침착이 증가된다. 철은 MRI에서 독특한 특성을 가지고 있어 인체의 철 침착과 분포를 비침습적으로 평가 및 정량화가 가능하다. 이 종설에서는 철 영상을 위한 MRI 기법에 대하여 알아보고, 노화 및 알츠하이머병을 포함한 퇴행성 뇌질환에서 변화를 고찰해 보고자 한다. 또한 현재 접근법의 제한점과 앞으로 기대되는 새로운 접근도 확인해 보고자 한다.
Jang, Jinhee,Pham, Viet Hung,Rajagopalan, Balasubramaniyan,Hur, Seung Hyun,Chung, Jin Suk Springer 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1
<P>Alkylamine-functionalized graphene oxides (FGOs) have superior dispersibility in low-polar solvents and, as a result, they interact with low-polar polymers such as polystyrene. In this work, the functionalization of graphene oxide using three types of alkylamines, octylamine (OA), dodecylamine (DDA), and hexadecylamine (HDA), was performed, and nanocomposites of polystyrene (PS) and FGOs were prepared via solution blending. Different dispersions of FGOs over PS were obtained for the three alkylamines, and the properties of the PS composites were influenced by the length of the alkylamine. A better thermal stability was observed with a longer chain length of the alkylamine. On the other hand, functionalization with the shortest chain length alkylamine resulted in the highest increase in the storage modulus (3,640 MPa, 140%) at a 10 wt.% loading of FGO.</P>
장진희(Jang, Jinhee) 한국노동연구원 2022 노동정책연구 Vol.22 No.2
본 연구는 최근 급증하고 있는 플랫폼이동노동자를 대상으로 사용종속적이고 저임금․장시간의 열악한 노동환경과, 비자발적 실업경험, 노무제공 과정에서의 사고상해 및 질병경험, 노후대비정도 등 사회보험의 취약성이 공제회 가입의향에 미치는 영향을 분석하였다. 이를 토대로 플랫폼이동노동자의 열악하고 지배종속적인 노동환경을 대변하기 위한 집단적 목소리와 사회보험의 필요성을 드러내고자 하였다. 분석을 위해 2019년 한국노총 플랫폼노동자 노동환경 실태조사 자료를 활용하고 순위형 로짓분석을 실시하였다. 또한 한계효과를 산출하여 공제회 가입의 주된 요인을 식별하였다. 분석결과, 노무제공 과정에서의 업무지시, 관리․감독을 받거나, 서비스 가격결정권이 플랫폼에 있는 경우, 즉 경제적으로 종속된 경우의 공제회 가입의향이 높았다. 또한 비자발적 실업을 경험하거나, 임금수준이 낮을수록 공제회의 필요성이 높았다. 이에 향후 설립을 앞둔 플랫폼노동자를 대상으로 하는 공제회에서는 전국민고용보험과 보완적 관계를 맺을 수 있는 실업공제 사업뿐만 아니라 이해대변의 역할도 필요함을 제안하였다. This study analyzed the effect that each of the following factors - dependent, low-wage and long-hour work environment; involuntary termination; experience of workplace injury and disease; vulnerability from the perspective of social insurance, such as inadequate old-age preparation - had on the willingness of the rapidly increasing platform workers to join the Mutual Aid Association. The analysis was conducted to underscore the necessity of a collective voice and social insurance in order to advocate for the platform workers who find themselves in poor and dominant-dependent work environments. The data from the 2019 Study on the Platform Workers Environment by the FKTU was used for the analysis, and an ordered logit analysis was conducted. The analysis showed that if, in the course of providing labor, workers were subject to workplace guidance, management and supervision and if the service charge was determined by the platform- in other words, in case of economic dependency - more workers were willing to join the association. Likewise, experience of involuntary termination and lower wage were associated with a higher necessity for association membership. In this regard, the Mutual Aid Association, which targets platform workers, focused on unemployment deduction that can have a complimentary relationship with the national employment insurance, while also suggesting that necessity of the role of interest representation.