Influence of Magnesium Powder and Heat Treatment on the Superconducting Properties of $MgB_2/Fe$ Wires

김남규,김이정,전병혁,김찬중,Tan, Tan Kai,Kim, N.K.,Kim, Y.I.,Jun, B.H.,Kim, C.J. 한국초전도학회 2007 Progress in superconductivity Vol.9 No.1

The most common technique to fabricate $MgB_2$ superconducting wire is by powder-in-tube (PIT) technique. Therefore, the starting powder for the processing of $MgB_2$ superconductors is an important factor influencing the superconducting properties and performance of the conductors. In this study, the influence of magnesium precursor powders and annealing temperatures on the transition temperatures ($T_c$) and critical current densities ($J_c$) of $MgB_2/Fe$ wires was investigated. All the $MgB_2/Fe$ wires were fabricated by in situ PIT process. It was found that higher $J_c$ was obtained for $MgB_2$ wires with smaller particle size of magnesium precursor powders. The $J_c$ also increases with decreasing annealing temperatures.

SCEM's impact on environmental activities SMEs

김남규,황금주,Kim, Namkyu,Hwang, Kumju Korean Resource Economics Association 2008 자원·환경경제연구 Vol.17 No.1

최근 경제와 산업 전반에서 중소기업의 환경성과와 환경활동은 지속가능 발전의 관점에서 특히 관심이 고조되고 있다. 중소기업을 지속가능성 체계(stainability framework)에 포함시키기 위해 진행되고 있는 다양한 노력 중에서도 그 동안 대기업이 주도하던 친환경공급망관리(Supply Chain Environmental Management)는 중소기업의 환경활동을 촉진시키는 유용한 수단으로 인식되고 있다. 본 연구는 우리나라 전기전자산업에서 대기업 주도의 친환경공급망접근방법(SCEM approach)이 중소기업의 환경성과에 미치는 영향에 대하여 실증분석하였다. 연구방법론으로는 설문조사 결과에 대하여 인자분석과 회귀분석을 실시하였다. 계량분석 결과, 대기업 주도의 SCEM이 중소기업의 환경활동촉진에 긍정적인 영향을 미치고 있으며, 특히 친환경공급망접근방법 중에 시장거래(arm's length) 기법보다는 협력적(collaborative) 기법이 더 효과적으로 중소기업의 환경활동 촉진에 기여하고 있다는 점을 제시하였다. 본 연구에서는 다국적 기업의 친환경공급망접근방법 역시 중소기업의 환경활동촉진에 중요한 요인이 되고 있다는 점도 도출하였다. Small and medium sized enterprises' (SMEs) environmental performance and activities have been often of great concern toward sustainability as they have been playing a critically important role in the economic and industrial development. Among many initiatives to engage SMEs into the sustainability framework, Supply Chain Environmental Management (SCEM) of large companies has a great potential to persuade SMEs to adopt environmentally improved activities. This study investigated the relationship between SCEM approaches of large companies and environmental activities of SMEs in the Korean electronics industry. A postal questionnaire survey was used as a data collection method, and factor analysis and regression analysis were applied to analyse the collected data. The empirical findings suggested that SCEM approaches of large companies have positive impacts on environmental activities of SMEs. Among SCEM approaches, the collaborative approach was more effective than the arm's-length approach. Additionally, this study found positive impacts of trans-national SCEM approaches on SMEs' environmental activities.

Hole Blocking Layer 사용에 따른 하이브리드 백색 OLED의 색순도 향상에 관한 연구

김남규,신훈규,권영수,Kim, Nam-Kyu,Shin, Hoon-Kyu,Kwon, Young-Soo 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.12

Novel materials of $Zn(HPB)_2$ and Ir-complexes were respectively synthesized as blue or red emitting material. White Organic Light Emitting Diodes (OLED) were fabricated by using $Zn(HPB)_2$ for a blue emitting layer, Ir-complexes for a red emitting layer and $Alq_3$ for a green emitting layer. White OLED was fabricated by using double emitting layers of $Zn(HPB)_2$ and $Alq_3:Ir$-complexes, and hole blocking layer of BCP. We also varied the thickness of BCP. When the thickness of BCP layer was 5 nm, white emission was achieved. We obtained a maximum luminance of $3,500cd/m^2$. The CIE coordinates was (0.375, 0.331). From this study, we could propose that the hybrid structure is efficient in lighting application of white OLED by improvement of color purity.

Update and Debate Issues in Surgical Treatment of Middle and Low Rectal Cancer

김남규,Min Sung Kim,Sami F. AL-Asari 대한대장항문학회 2012 Annals of Coloproctolgy Vol.28 No.5

Based on a review of the literature, this paper provides an update on surgical treatment of middle and low rectal cancer and discusses issues of debate surrounding that treatment. The main goal of the surgical treatment of rectal cancer is radical resection of the tumor and surrounding lymphatic tissue. Local excision of early rectal cancer can be another treatment option, in which the patient can avoid possible complications related to radical surgery. Neoadjuvant chemoradiation therapy (CRT) has been recommended for patients with cT3-4N0 or any T N+ rectal cancer because CRT shows better local control and less toxicity than adjuvant CRT. However, recent clinical trials showed promising results for local excision after neoadjuvant CRT in selected patients with low rectal cancer. In addition, the “wait and see” concept is another modality that has been reported for the management of tumors that show complete clinical remission after neoadjuvant CRT. Although radical surgery for middle and low rectal cancer is the cornerstone therapy, an ultralow anterior resection with or without intersphincteric resection (ISR) has become an alternative standard surgical method for selected patients. Many studies have reported on the oncological safety of the ISR, but few of them have addressed the issue the functional outcome. Furthermore, an abdominoperineal resection (APR) has problems with high rates of tumor perforations and positive circumferential resection margins, and those factors have contributed to its having a high rate of local recurrence and a poor survival rate for rectal cancer compared with sphincter-saving procedures. Recently, great efforts have been made to reduce these problems, and the total levator excision or the extended APR concept has emerged. Surgical management for low rectal cancer should aim to radically excise the tumor and to preserve as much of the sphincter function as possible by using a multimodality approach. However, further prospective clinical trials are needed for tailored treatment of rectal cancer patients.

도핑 비율에 따른 하이브리드 백색 OLED의 효율 향상에 관한 연구

김남규,신훈규,권영수,Kim, Nam-Kyu,Shin, Hoon-Kyu,Kwon, Young-Soo 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.9

We synthesized new materials of $Zn(HPB)_2$ and Ir-complexes as blue or red emitting material. We fabricated white Organic Light Emitting Diodes (OLED) by using $Zn(HPB)_2$ for the blue emitting layer, Ir-complexes for the red emitting layer and $Alq_3$ for the green emitting layer. We fabricated white OLED by using double emitting layers of $Zn(HPB)_2$:Ir-complexes and $Alq_3$. The doping rate of Ir-complexes was varied, such as 0.2%, 0.4%, 0.6%, and 0.8%, respectively. When the doping rate of $Zn(HPB)_2$:Ir-complexes was 0.6%, white emission was achieved. The Commission Internationale de l'Eclairage (CIE) coordinates of the white emission was (0.322, 0.312).

목탄이 첨가된 $MgB_2$의 초전도 성질에 미치는 열처리 온도의 영향

김남규,탄카이신,전병혁,박해웅,주진호,김찬중,Kim, Nam-Kyu,Tana, Kai Sin,Jun, Byung-Hyuk,Park, Hai-Woong,Joo, Jin-Ho,Kim, Chan-Joong 한국초전도학회 2007 Progress in superconductivity Vol.9 No.1

Charcoal was used as a carbon source for improving the critical current density of $MgB_2$ and the effect of annealing temperature on the $J_c$ of $MgB_2$ was investigated. The charcoal powder used in this study was $1{\sim}2$ microns in size and was prepared by wet attrition milling. $MgB_2$ bulk samples with a nominal composition of $Mg(B_{0.95}C_{0.05})_2$ were prepared by in situ process of Mg and B powders. The powder mixture was uniaxially compacted into pellets and heat treated at temperatures of $650^{\circ}C\;-\;1000^{\circ}C$ for 30 minutes in flowing Ar gas. It was found that superconducting transition temperature of $Mg(B_{0.95}C_{0.05})_2$ decreased by charcoal additions which indicates the carbon substitution for boron site. $J_c$ of $Mg(B_{0.95}C_{0.05})_2$ was lower than that of the undoped $MgB_2$ at the magnetic fields smaller than 4 Tesla, while it was higher than that of the undoped sample especially at the magnetic field higher than 4 T. High temperature annealing seems to be effective in increasing $J_c$ due to the enhanced carbon diffusion into boron sites.

경관 급식의 적용과 투여방법의 실제

김남규,Kim, Nam-Gyu 대한병원협회 1990 대한병원협회지 Vol.19 No.6

도인(挑仁)이 일측 신절제와 streptozotocin으로 유발된 당뇨병성 신증 Rat에 미치는 영향

김남규,오재선,전상윤,Kim, Nam-Kyu,Oh, Jae-Seon,Jeon, Sang-Yun 대한한방내과학회 2014 大韓韓方內科學會誌 Vol.35 No.4

Objectives: Diabetic nephropathy is the most common cause of end stage renal disease. Transforming growth factor (TGF)-${\beta}1$, type IV collagen, advanced glycation end-products (AGEs), and angiotensin II type 1 receptor (AT1) are the main factors of diabetic nephropathy. We investigated the effects of Prunus on renal function and histopathological changes of diabetic nephropathy rat model induced by unilateral nephrectomy and streptozotocin. Methods: Diabetes was induced in male Sprague-Dawley rats ($290{\pm}10g$) by injecting streptozotocin (55 mg/kg) into the tail vein after unilateral nephrectomy. Rats were divided into 3 groups (n=6): normal, control, and Prunus. After 8 weeks of oral administration of Prunus extract on the Prunus group from 3 days after streptozotocin injection, we checked weight, 24 hrs urine, blood biochemistry and renal tissue to evaluate renal function and histopathological changes by examining parameters including albuminuria, BUN, creatinine, cholesterol, low density lipoprotein (LDL), triglyceride, TGF-${\beta}1$, type IV collagen, AGEs, and AT1. We also measured mRNA expression of TGF-${\beta}1$, type IV collagen, AGEs, and AT1 by Real Time polymerase chain reaction (RT-PCR). Results: Prunus decreased the amount of 24 hrs proteinuria, and inhibited histopathological changes of diabetic nephropathy including the expression and accumulation of TGF-${\beta}1$, type IV collagen and AGEs which could promote development of diabetic nephropathy. Prunus also inhibited mRNA expression of TGF-${\beta}1$, type IV collagen. Conclusions: These findings suggest that Prunus might protect the renal function and inhibit the development of renal injury by regulating factors including TGF-${\beta}1$, type IV collagen, AGEs, except AT1, so Prunus can be used for diabetic patients to prevent the progression of diabetic nephropathy.

열/구조 해석을 위한 중첩 유한요소 개발

김남규(Namkyu Kim),김홍석(Hongseok Kim),김도년(Do-Nyun Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.8

스토킹 행위자 위치추적 전자장치 부착제도의 도입 쟁점과 과제

김남규(Kim, Namgyu),박다윤(Park, Dayoon),노희주(Noh, Heejoo),김도선(Kim, Dosun),김연수(Kim, Yeonsoo) 한국형사법무정책연구원 2023 형사정책연구 Vol.134 No.-

이 연구는 2021년 10월 시행된 스토킹처벌법의 미비점으로 지적되는 피해자 보호와 가해자 제재 강화를 위해 위치추적 전자장치 부착제도의 도입을 검토하였다. 현행 제도의 문제점을 확인하고, 최근의 개정입법 현황에 대해 살펴보았다. 특히, 해외의 법제 검토와 국내 입법진행상 국회 법사위원회에서의 논의과정을 통해 제도 도입의 방향과 추가적인 고려사항을 도출하였다. 첫째, 위치추적 전자장치 부착제도가 갖는 기본권 침해 가능성을 최소화하기 위해서는 법관의 판단이 필요한 잠정조치에 포함하여야 한다. 둘째, 제도운용의 주체는 3원화하여 부착명령은 법원이, 장치 관리 및 탈부착은 경찰이, 부착자 위치추적 감시는 법무부가 각각 수행한다. 다만, 기관간 협조체계 구축을 위해 경찰과 보호관찰관의 인적 교류를 제안한다. 셋째, 부착기간은 최대 2개월로 하되 최대 2회 연장이 가능한 것으로 하고, 잠정조치 위반 시 다른 잠정조치에 부과되는 벌칙과 동일하게 2년 이하 징역 또는 2,000만원 이하 벌금형이 타당하다고 본다. 끝으로, 쌍방향 전자감독 제도 도입의 논의와 제도도입의 효과평가를 통해 제도개선과 보완을 위한 환류체계를 제안한다. The study examined the introduction of a location-tracking electronic device attachment system to protect victims and strengthen sanctions on perpetrators, which are pointed out as deficiencies in the Stalking Punishment Act, which took effect in October 2021. The problems of the current system were identified and the current status of the recently revised legislation was examined. In particular, the direction of the introduction of the system and additional considerations were derived through the discussion process at the National Assembly Judiciary Committee during the review of overseas legislation and domestic legislation. First, in order to minimize the possibility of infringement of basic rights of the location tracking electronic device attachment system, it should be included in temporary measures that require judgment by judges. Second, the subject of the system operation is three won, and the attachment order is carried out by the court, the device management and attachment are carried out by the police, and the Ministry of Justice is responsible for monitoring the location of the attachment. However, in order to establish a cooperative system between institutions, human exchanges between the police and probation officers are proposed. Third, the attachment period is up to two months, but it can be extended up to two times, but in the same way as penalties imposed on other provisional measures in the event of a violation of provisional measures, imprisonment for up to two years or a fine of up to 20 million won is considered reasonable. Finally, a reflux system for improving and supplementing the system is proposed through discussion of the introduction of a two-way electronic supervision system and evaluation of the effectiveness of the introduction of the system.