정압기지에 대한 산불화재 영향평가

장서일,차순철,강경식 대한안전경영과학회 2007 대한안전경영과학회지 Vol.9 No.2

지그비 기반의 진동모니터링 네트워크 시스템

장서일(Seo Il Chang),전혜성(Hyesung Jeon),황인장(In Jang Hwang),정성환(Sung-Hwan Jung) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.5

이상 시에 나타나는 거울-이미지 양상 연구 -거울 시편을 중심으로-

장서란 ( Jang Seo-lan ) 국제어문학회 2021 국제어문 Vol.- No.90

본고는 들뢰즈의 논의를 중심으로 거울 시편에 나타나는 거울-이미지의 양상과 이를 바탕으로 구성되는 “책임의사 이상”을 통하여 이상 시의 초현실주의적 정치성을 규명하였다. 거울 시편에서 나타나는 잠재태와 현실태의 식별불가능성은 기존의 진리 체계에 균열을 내고 새로운 사유를 촉발하는 탈영토화의 정치성과 연결된다. 거울-이미지는 기존 세계를 유기적으로 재현하는 기반으로서의 감각-운동 도식을 파괴한다. 실재와 거울상은 서로를 전제하며 반향하며, 타자(여성)-되기를 통하여 주체의 동일성이라는 기존의 진리 체계에 균열을 불러일으킨다. 나아가 시적 주체는 거울상을 진찰하려는 욕망을 통하여 자신의 고통을 외부로 확장시킨다. 진찰은 병환을 전제하며, 이상은 병환이 개인이 아닌 사회에서 비롯된 것임을 숫자와 기호를 통하여 제시한다. 그러므로 기존의 진리 체계인 감각-운동 도식을 파괴하는 비유기적 이미지인 거울-이미지는 현실을 고발하는 동시에 현실을 극복하려는 초현실주의적 정치성을 구현한다. This paper investigates the surreal political nature of the aspects of the Mirror-Image displayed on the mirror poems, centered on the discussion of Deleuze, as well as the “Yi sang the physician in charge” that is constructed based on the Image. The impossibility of distinguishing between potentialities and actualities, which is displayed in the mirror poems, exposes the politics of deterritorialization that breaks into the exisiting truth system and provokes a new thought. The Mirror-Image breaks the sensory-motor schema, which is a base that organically reproduces the existing world. The presence and the Mirror-Image reverberate on the premise of each other, and by the becoming-other(female), a rift is caused in the system of the subject’s identity. In addition, the poetic subject exudes his suffering through the desire to examine the Mirror-Image. The examination is premised on the illness and Yi Sang presents through the numbers and marks that the illness roots from the society level, not the individual level. Therefore, the Mirror-Image breaks the sensory-motor schema that is the preexisting truth system, and simultaneously accuses the present, while revealing the surreal politics that seeks to overcome the present.

생체모방과 산업디자인의 접목 사례 연구

장서역(Zhang, Rui Yu),김선철(Kim, Sun Chul) 한국디지털디자인협의회 2014 (사)한국디지털디자인협의회 conference Vol.2014 No.5

전라남도 칠산도 주변 참조기(Larimichthys polyactis) 어란 출현의 첫 보고

장서하,김진구,유정화 한국수산과학회 2020 한국수산과학회지 Vol.53 No.4

Chilsan-do Island, South Korea, has previously been identified as one of the biggest spawning sites of the small yellow croaker Larimichthys polyactis in the Yellow Sea. To determine whether Chilsan-do still serves as a spawning site for L. polyactis, three to five stations around Chilsan-do Island were surveyed for eggs from April to June (the main spawning season of L. polyactis) in 2019, using an RN80 net. For the first time, three L. polyactis eggs were identified at two stations, located just in front of Chilsan-do Island and between Chilsan-do and the coastline, only in May. The diameter of L. polyactis eggs (1.26-1.34 mm) was very similar to those of Collichthys niveatus (1.30-1.37 mm) and Setipinna tenuifilis (1.34-1.35 mm). During the survey period, the sea surface salinity remained constant (32.0-32.1 psu), but the sea surface temperature (SST) rapidly rose from 13.6-13.7°C in April to 22.1°C in May. Our findings suggest that L. polyactis still spawns near Chilsan-do Island today, but on a very small scale, and that changes in SST promote spawning of L. polyactis.

저궤도 우주환경에서 에폭시-실리카 나노 복합소재의 열화거동 분석

장서현(Seo-Hyun Jang),한유수(Yusu Han),황도순(Do Soon Hwang),정주원(Joo Won Jung),김영국(Yeong Kook Kim) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.12

이 연구에서는 저궤도 우주 환경(LEO) 조건에서 나노실리카 에폭시 복합소재의 실리카 농도가 재료의 열화 거동에 미치는 영향에 대해 알아보았다. 실리카 입자를 에폭시 수지에 10%와 18% 두 가지 서로 다른 무게비로 나노복합소재를 제작하여 저궤도 우주 환경 모사장치에서 열화시켰다. 열화된 나노복합소재를 대상으로 열중량분석(Thermogravimetric Analysis, TGA)를 수행하였고 등변환법(Iso-conversional Method)에 기반한 Friedman 방법, Flynn-Wall-Ozawa(FWO) 방법, Kissinger 방법, 그리고 DAEM(Distributed Activation Energy Method)으로 활성화에너지를 계산하였다. 그 결과 나노입자가 섞이지 않은 샘플은 열화가 진행되면서 중가함을 보였다. 그러나 10%와 18%는 열화싸이클이 15회일 때까지 증가하였으나 그 이후에는 감소하였으며, 따라서 나노 입자가 열화 거동에 부정적인 영향이 있음을 보였다. 또한 활성화에너지 계산에 적용된 방법에 대해 토의하였다. In this study, the effects of Low Earth Orbit(LEO) environments on the degradation behavior of epoxy nano silica composite materials were investigated. The nanocomposite materials containing silica particles in different weight ratios of 10% and 18% were prepared and degraded in a LEO simulator to compare with the neat epoxy cases. Thermogravimetric analysis (TGA) was performed on the degraded nanocomposites and the activation energies were calculated by Friedman method, Flynn-Wall-Ozawa (FWO) method, Kissinger method, and DAEM (Distributed Activation Energy Method) based on the iso-conversional method. As the results, for the neat epoxy sample cases, it was found that the average activation energy was increased as the degradation was progressed. When the nano particles were mixed, however, the energy increased to the 15 environmental test cycles, and decreased afterwards, meaning that the particle mixture contributed adversely to the thermal degradation. Discussions on the results of the different calculation methods were also given.

다공성 금속 구조체 합성 및 에너지 저장 소재로서의 응용

장서현(Seohyeon Jang),강지현(Jihyeon Kang),박수민(Soomin Park),남인호(Inho Nam) 한국세라믹학회 2022 세라미스트 Vol.25 No.2

Porous metal or metal oxide frameworks have been comprehensively applicated to numerous fields such as catalyst, energy storage system, and bio-filtration. Here, we introduce a de-alloying method prior to a facile polymer gel-templating to synthesize a self-supporting porous metal/metal oxide frameworks (e.g. Au, Ag, Ag/CuO, Au/MnO₂, etc.). The template methods based on polymer gel suggest easy preparation of porous metal/metal oxide frameworks, prepared by heating a metal precursor impregnated in polymer gel. Compared to de-alloying Ag65A35 method, polymer gel based soft template serves numerous advantages as follows; 1) facile fabrication of porous transition metal structure, 2) atom economy, 3) high-loading of precious metals, 4) harmless to human and environment, 5) natural abundance, 6) easy to scale-up and control the pore size by differentiate the polymer content ratio, 7) mild reaction conditions, and 8) structural controllability, 9) cost-effectiveness, etc. We report the methodologies to synthesis bicontinuous metal/ metal oxide architectures, derived from porous gel soft templates, and they are applicated to the energy storage system such as, supercapacitor, pseudocapacitor, and battery.

8 MW급 대용량 풍력발전기용 피치 감속기 진동특성에 관한 연구

장서원,박세호,이형우 한국풍력에너지학회 2022 풍력에너지저널 Vol.13 No.4

In this paper, a study on the vibration characteristics of the pitch gearbox of 8 MW large capacity wind turbines was conducted. The vibration analysis method of the pitch gearbox was proposed by combining the planetary gear train vibration model with the housing and carrier finite element model using the substructural synthesis method. We modeled the vibration excitation source for mass unbalance, gear mesh frequency, and bearing defect error action on the pitch gearbox, and performed a critical speed analysis. As a result of analyzing the critical speed of the pitch gearbox, the critical speed for the excitation source did not occur within the operation speed (84.87 rpm). In addition, as a result of applying 10 %, 20 %, …, 100 % of the largest load duration distribution (LDD) load, it was found that the bearing stiffness and the primary natural frequency were larger as the LDD load was larger. The primary natural frequency was 81.47 Hz for the lowest load among LDD data, which exceeded an operating speed of 84.87 rpm (5.09 Hz), so it was found that vibration caused by the change of LDD load did not occur in the operating speed range.

정량적 위험성 평가에 의한 안전관리 투자의 비용-편익분석

장서일,이헌창,장영준,조지훈,김태옥 대한안전경영과학회 2001 대한안전경영과학회 학술대회논문집 Vol.2001 No.1

고압 독성가스시설에서 API-581 적용성 및 사고결과 분석방법에 관한 연구

장서일(Seo-Il Jang),김영란(Youngran Kim),박교식(Kyoshik Park),신동일(Dongil Shin),김태옥(Tae-Ok Kim) 한국가스학회 2014 한국가스학회지 Vol.18 No.4

본 연구는 독성가스 사고의 주요 원인의 하나인 부식에 대해 고압 독성가스시설을 대상으로 필요한 안전기술을 정립하기 위하여 미국석유학회에서 개발한 API-581 절차를 채택하여 사고결과 분석방법에 대한 적용성을 검토하고, 이를 바탕으로 사고결과 분석방법을 제시하였다. 고압 독성가스시설에서 API-581의 8단계 사고결과 분석절차에 따라 단계별 적용성을 검토한 결과, 고압 독성가스시설에 적용할 사고결과 분석방법은 총 6단계로 단순화 할 수 있었다. 즉, Step 1(대표물질 결정), Step 5(누출유형 결정), Step 6(유체상 결정)과 Step 8(사고 피해영역 산출)은 적용하지 않고, Step 3(누출량 산출)은 inventory group 개념만 적용하며, Step 4(누출속도 산출)는 기체 누출속도만을 적용하고, Step 2(누출공 크기 선정)와 Step 7(완화시스템 등급 결정)은 전부 적용한다. 이때, Step 5와 Step 8은 일반적으로 적용이 가능한 CCPS 방법을 대안적인 방법으로 채택한다. To establish the necessary safety technology in high-pressure toxic gas facilities, especially for the corrosion, which is the main causes of toxic gas accident, this study adopts and investigates the API-581 procedures developed by the American Petroleum Institute (API). And the applicability of the 8-step analytical procedures of consequence analysis in API-581 is discussed, and a method for consequence analysis in high-pressure toxic gas facilities is suggested. Based on the discussion and results, the analytical procedure is simplified as the 6 steps in total for the effective application to high-pressure toxic gas facilities: Step 1 (determination of representative material), Step 5 (determination of release type), Step 6 (determination of phase of fluid), and Step 8 (estimation of damage range) are not applied: Step 3 (estimation of total amount of release) is applied only for the inventory group concept; Step 4 (estimation of release rate) only for the gas release rate; and all of Step 2 (selection of release hole size) and Step 7 (evaluation of post-release response) are applied. In the proposed method, the generally applicable method of CCPS is adopted as alternative method for Steps 5 and 8.