[기획보도 부문_제159회 이달의 방송기자상] 정부의 관심만 있었다면 지킬 수 있었을텐데… : 〈‘3D프린터와 암’ 2부작〉 2021년 12월 11일~12일 방영 YTN 고한석, 곽영주, 김웅래, 김지환, 류석규, 박재상, 박희재, 신지원, 온승원, 이상엽, 이수연, 최광현 기자

김지환 (사)방송기자연합회 2022 방송기자 Vol.65 No.-

영국 규제요건 충족을 위한 안전계통 설계 고찰

김지환 한국에너지학회 2017 한국에너지공학회 학술발표회 Vol.2017 No.9

진공 웹코터로 제작된 대면적 ITO/PET의 특성 연구

김지환,박동희,김종빈,변동진,최원국,Kim, Ji-Hwan,Park, Dong-Hee,Kim, Jong-Bin,Byun, Dong-Jin,Choi, Won-Kook 한국재료학회 2007 한국재료학회지 Vol.17 No.10

Indium tin oxide, which is used as transparent conducting layer in flexible device, is deposited on PET film by a magnetron sputtering in 300 mm wide roll-to-roll process (vacuum web coating). Sheet resistance, specific resistance and transmittance is differed by sputtering parameters such as working pressures, oxygen partial pressure, and thickness of ITO layer. ITO layer is deposited about 90 nm at roll speed of 0.24 m/min and its sputtering power is 3 kW. From the XRD spectrum deposited ITO layer is verified as amorphous. Under working pressure varied from $3{\times}10^{-4}\;Torr$ to $2{\times}10^{-3}\;Torr$, sheet resistance is lowest at the working pressure of $1{\times}10^{-3}\;Torr$ and its value is from $110\;{\Omega}/{\square}$ to $260\;{\Omega}/{\square}$ at the thickness of 90 nm. Oxygen partial pressure also varies sheet resistance and is optimized at the regime from 0.2% ($1.8{\times}10^{-6}\;Torr$) to 0.6% ($6{\times}10^{-6}\;Torr$). In this oxygen partial pressure sheet resistance is lower than $150\;{\Omega}/{\square}$. As ITO layer thickness increases, sheet resistance decreases down to $21\;{\Omega}/{\square}$ and specific resistance is about $7.5{\times}10.4{\Omega}cm$ in 340 nm thickness ITO layer. Transmittance is measured at the wavelength of 550 nm and is about 90% for 180 nm thickness ITO/PET.

글리콜 용매 기반 저온 치환 은도금법으로 형성시킨 동박막 상 극박 두께 Ag 도금층

김지환,조영학,이종현,Kim, Ji Hwan,Cho, Young Hak,Lee, Jong-Hyun 한국마이크로전자및패키징학회 2014 마이크로전자 및 패키징학회지 Vol.21 No.2

Citric acid 함유 diethylene glycol 용매 기반 용액의 치환 은도금 특성을 분석하기 위하여 Cu 박막 시편을 사용한 상온~$50^{\circ}C$ 온도 범위에서의 도금을 실시하였다. 사용된 Cu 박막 시편은 스퍼터링된 Cu를 과에칭하여 다수의 핀홀이 형성된 상태로 사용하였다. 도금을 $40^{\circ}C$에서 실시한 경우 갈바닉 치환 반응이 주로 발휘되면서 5분간의 도금 후에는 Cu 표면의 핀홀들이 완전히 Ag로 채워지고 Cu 표면도 전면적으로 Ag로 도금된 결과를 관찰할 수 있어 가장 우수한 Ag도금 특성을 얻을 수 있었다. 이후 도금 시간을 30분까지 증가시키게 되면 용액 내 환원 반응을 통한 입자들의 증착이 진행되면서 Ag 도금부의 요철이 점차 심해지는 현상이 관찰되었다. 전면적이 Ag로 도금된 Cu 시편의 대기 중 고온 내산화성을 평가한 결과 Ag가 도금되지 않은 Cu 시편에 비해 약 $50^{\circ}C$ 정도가 높은 온도에서 산화 거동이 관찰되어 향상된 내산화 특성을 확인할 수 있었다. To investigate the plating properties of a diethylene glycol-based Ag immersion plating solution containing citric acid, silver immersion plating was performed in a range from room temperature to $50^{\circ}C$ using sputtered Cu specimens. The used Cu specimens possessed surface structure with large numbers of pinholes which were created with over-acid etching. The Ag immersion plating performed at $40^{\circ}C$ exhibited that the pinholes and copper surface were completely filled with Ag just after 5 min mainly due to galvanic displacement reaction, indicating the best plating properties. Subsequently, the surface morphology of Ag-coated Cu became rougher as the plating time increased to 30 min because of the deposition of silver nanoparticles created by chemical reduction in the solution. The specimen that its overall surface was covered with silver indicated the start of oxidation at temperature higher than around $50^{\circ}C$ in air as compared with pure Cu, indicating enhanced anti-oxidation properties.

The Effects of Breath-Counting Meditation and Deep Breathing on Heart Rate Variability

김지환,배효상,박성식 대한한의학회 2016 대한한의학회지 Vol.37 No.2

Objectives: This study aimed to evaluate the effects of breath-counting meditation (BCM) and deep breathing (DB) on heart rate variability (HRV). These breathing techniques have the characteristics of non-paced and self-controlled breathings, resulting in less increase of HRV. We also compared BCM and DB with usual breathing (UB) or relaxing breathing (RB) which can reveal the characteristics of those. Methods: 83 healthy volunteers sitting in chairs performed non-paced breathing; UB, RB, BCM, and DB each for 5 minutes. One minute of relaxation was permitted between breathings. Participants surfed the internet sitting in front of a computer during UB, while for RB, they remained steady with eyes closed. For BCM, they breathed inwardly counting from 1 to 10 repetitively, while they took a deep breath during DB. Physiological indices were simultaneously recorded with a biofeedback system. Results: Respiration rate, thoracic amplitude, and mean heart rate decreased in RB compared with UB, but there was no change in HRV. Respiration rate in BCM and DB was lower than that in UB or RB, and the amplitude of thorax or abdomen, and HRV all increased (p<0.05). However, mean heart rate and skin conductance decreased in BCM compared with UB (p<0.05), whereas those were no different between DB and UB. Conclusion: BCM, just concentrating mentally on breathing with counting each breath, can increase HRV with less sympathetic activation, while DB, actively moving thorax and abdomen for achieving the deepest respiration rate, can greatly raise HRV with the maintenance of mean vagal or sympathetic tone.

종전 후 中國國民政府의 敵産 處理와 國營企業의 경영— 敵産紗廠 接收와 中國紡織建設公司의 設立을 중심으로 —

김지환 중국근현대사학회 2017 중국근현대사연구 Vol.76 No.-

中日戰爭爆發后,國民政府積極權導上海等沿岸地區的紡織資本家跟政府合作參與把工業生産設備遷移到大后方地區.然而紡織資本家却沒積極參與內遷政策.尤其華商紗廠聯合會等大多數紡織資本家仍然犹豫遷移生産設備.實質上大后方地區沒具備經營企業的環境,沒有原料供給及製品出售大市場.但戰爭結束后,這種資本家的行爲引起經濟漢奸爭論.不少市民預測把敵産企業沒收后,賦與爲了合作國民政府參與內遷的大后方資本家優先承購敵産紗廠的權利. 然而抗戰結束后中國經濟情況已經面臨非常嚴重的邊緣.戰后不少敵産企業封閉,這還造成棉製品需求上出現供不應求.尤其國民政府財政部頒布‘僞中央貯備銀行鈔票收換辦法’后,物價迅速上漲,加速通貨膨脹,隨卽連天發生工潮.對此,國民政府必修全力以赴敵産紗廠復工,以便增加生産活動,緩解社會就業壓力.這就是敵産紗廠國營化及國營經營,則中國紡織建設公司成立的核心目的. 國民政府通過中國紡織建設公司實施棉業統制政策以千方百計試圖平抑物價上漲.從此可見,中國紡織建設公司的成立本身就與國民政府的棉業統制政策具有密不可分的關係.盡管如此,民營紗廠總是沒積極參與或合作政府及中國紡織建設公司主導的棉業統制政策.國民政府的硬性平抑紗布政策相當程度上限制,影響民營紗廠的經營.所以不少民營紗廠往往不遵守限價政策,反而趁機轉售黑市,故意抬高紗價,獲取巨額利益.在國家權力與紡織資本家之間的這種不合作沒能取得經濟統制政策的效果,終于沒能取得預期成果.

양독백호탕(陽毒白虎湯)으로 개선된 아토피 피부염 환자 치험 1례

김지환,김민지,손한범,배효상,박성식,Kim, Ji-Hwan,Kim, Min-Ji,Son, Han-Beom,Bae, Hyo-Sang,Park, Seong-Sik 사상체질의학회 2013 사상체질의학회지 Vol.25 No.4

Objectives The purpose of this case study was to report the main effect of Yangdokbaekho-tang to a Soyangin atopic dermatitis patient. Methods This patient was treated by Yangdokbaekho-tang, topical herbal extract, moxa and acupuncture according to the result of Sasang constitutional diagnosis. Results and Conclusions The patient's subjective symptoms of atopic dermatitis and general condition were improved after using Yangdokbaekho-tang in spite of patient's loose stool. The SCORAD index (Scoring Atopic Dermatitis Severity Index) which was used to evaluate the therapeutic effect of Sasang constitutional treatment on atopic dermatitis was also decreased from 86.3 to 42.8 without using anti-histamine or steroid medications.

구리 플레이크의 무전해 은도금에서 암모늄계 구리 전처리 용액의 적용법

김지환,이종현,Kim, Ji Hwan,Lee, Jong-Hyun 한국마이크로전자및패키징학회 2015 마이크로전자 및 패키징학회지 Vol.22 No.4

내산화 특성을 가지는 저가격 도전성 필러 소재로의 적용을 위해 Ag 코팅 Cu 플레이크의 제조를 수행하면서 Cu 플레이크 표면의 산화층 제거를 위한 암모니아수 기반 전처리 용액의 적용법에 따른 영향을 분석해 보았다. 1회 전처리법 적용 시 전처리 시간이 2분을 초과하면서 플레이크 표면에서 홀 형태의 결함들이 생성되었으며, 유지시간에 비례하면서 그 개수와 크기가 점차 증가하였다. 또한 2분간의 전처리 후 Ag 도금 용액을 투입한 결과 도금 반응 중에 결함 발생이 다시 진행되어 플레이크 입자의 손상을 막을 수 없었다. 이에 비해 2분간의 1차 전처리 후 전처리 용액을 제거하고 저농도의 전처리 용액을 투입하여 2차 전처리를 실시하면서 Ag 도금 용액을 투입한 공정법에서는 상기 결함의 발생 빈도를 크게 줄일 수 있었다. 그 결과 1회 전처리법으로 제조된 15 wt% Ag 코팅 Cu 시료의 경우 약 $166^{\circ}C$의 온도부터 산화가 시작되었지만, 2회 전처리법으로 제조된 시료는 약 $224^{\circ}C$에서 산화가 시작되어 월등히 향상된 내산화 특성을 나타내었다. In order to prepare a low-cost conductive filler material possessing improved anti-oxidation property, Ag-coated Cu flakes were fabricated and the effects of an applying method of ammonium-based pretreatment solution on the Cu flakes were analyzed. The pretreatment solution was used to remove the surface oxide layer on Cu flake. During a single-stage pretreatment process, hole-shaped defects were formed on the flake surface during the pretreatment after 2 min, and the number and size increased in proportion to the pretreatment time. In the case that Ag plating solution was injected in the pretreatment solution after the pretreatment for 2 min, the defects were also formed during Ag plating. In contrast, the defects tremendous decreased in the case that the pretreatment solution was removed after the first pretreatment for 2 min and the Ag plating proceeded after the second pretratment using a low concentration pretreatment solution. As the final result, the 15 wt% Ag-coated Cu flake sample which was fabricated using the single-stage pretreatment oxidized at $166^{\circ}C$, but the sample fabricated by the double-stage pretreatment oxidized at $224^{\circ}C$, indicating definitely improved anti-oxidation property.

원자로 정지신호 지연을 수반한 예상운전 과도 사건 분석

김지환,김용수 한국에너지학회 2015 한국에너지공학회 학술발표회 Vol.2015 No.11

인간, 그래도 먹어야 했다 - 헨미 요, 「먹는 인간」(메멘토, 2017)

김지환 신앙인아카데미 2017 맘울림 : 깊고 넓고 맑은 삶을 위하여 Vol.40 No.-