이온주입이 금속의 일함수에 미치는 영향(Ⅰ)

김현경,강석태,황정남,이철주,최대선,정병두 연세대학교 자연과학연구소 1984 學術論文集 Vol.13 No.-

이온 주입이 일함수 차이에 미치는 영향을 연구하기 위하여 낮은 에너지 이온 가속기, 전자총과 기타 일함수 차이를 측정하기 위한 장치를 설계, 제작하였다. 제작된 이온 가속기의 집속 특성은 이론적인 값과 일치하였다. 즉, 집속 렌즈의 확대율이 이론값은 2.0인데 비하여 1.2로 상당히 작은 값이었다. 또한 집속 렌즈의 전압 V_L과 추출 전압 V_e에 의한 집속 특성 역시 이론값과 매우 잘 일치하였다 . 제작된 장치를 사용하여 다결정 Cu와 Ni의 일함수 차이를 측정한 결과 0.45eV임을 알았다. 그리고 전자선을 이용하여 억제 전위차로 일함수를 측정할때 입사 전자의 반사율을 고려해야 함을 알았다. Low energy ion accelerator, electron gun, and apparatus for measuring work function difference are designed and constructed in order to study the effect of ion implantation on the work function. The focusing properties of accelerator is coincided with theoretical results; the magnification of Einzel lens is found to be 1.2, while theoretical value is 2.0, and the focal properties as a function of V_L/V_e are in good agreement with theory. Using these systems, the work function difference between polycrystalline Cu and Ni is found to be 0.45eV, and the experimental retarding potential plots indicate close agreement with the theoretical values modified by electron reflection.

심실중격결손증-치험 1예-

조광현,우종수,황윤호,이양행,박철호,김종성,김철호,이경순,조영일,박태인 인제대학교 1985 仁濟醫學 Vol.6 No.4

A successful treatment of infants and children with congenital heart defects depends upon several factors: diagnosis must be accurate, the operative technique, including techniques of perfusion and myocardial preservation, must be suited to the needs of patients and intensive cares, including accurate anesthesia, must be applied through all stages of investigation and treatment, i.e. before, during and after the operation. Recently we performed a open heart surgery successfully for a six-years old girl who had suffered from frequent upper respiratory tract infection and mild to moderate exertional dyspnea with congenital heart defects (ventricular septal defect, Kirklin type II, with patent foramen ovale). The operation and postoperative course were very smooth. And now we report this with review of literatures.

이온 주입이 금속의 일함수에 미치는 영향(Ⅱ)

백영환,김현경,강석태,황정남,이철주,최대선,정병두 연세대학교 자연과학연구소 1985 學術論文集 Vol.15 No.-

낮은 에너지 가속기를 제작하여 순도가 99.99%인 다결정 Ni에 Li^+ 이온을 7 keV의 에너지로 각 시료에 대한 이온주입율이 1.3×10^16atoms/㎠, 4.0×10^15atoms/㎠, 2.0×10^15atoms/㎠, 1.0×10^15atoms/㎠, 2.0×10^14atoms/㎠ 가 되도록 주입시킨 후 전자총과 억제 전위차형 에너지 분석기를 이용하여 일함수의 변화를 측정하였다. 이온 주입율이 2×10^15atoms/㎠보다 작을 때는 일함수가 1.9 eV까지 감소하였고 이온주입율이 4.0×10^15atoms/㎠보다 많을 때는 일함수가 2.8 eV까지 증가하였다. 이것은 Topping의 이론 및 Bauer의 실험결과와 일치함을 보였다. The changes in the work function of polycrystalline Ni with a purity of 99.99% due to Li^+ ions implanted using a low energy ion accelerator and retarding potential energy analyser(RPEA) have been studied. The implantation energy of the Li^+ ions is 7 keV and the implanted ion dose for the various samples are 1.3×10^16 atoms/㎠, 4.0×10^15 atoms/㎠, 2.0×10^15 atoms/㎠, 1.0×10^15 atoms/㎠ and 2.0×10^14 atoms/㎠. When the ion dose is less than 2×10^15 atoms/㎠ the, work function decreases to 1.9 eV, but when the ion dose is more than 4×10^15 atoms/㎠, the work function increses to 2.8 eV. These results are in good agreement with Topping's theory and Bauer's experiment.

신장 ; 다발성 골수종에서 신부전 발생의 위험인자 및 신기능 회복 예측인자

황현철 ( Hyun Chul Whang ),고은실 ( Eun Sil Koh ),김정관 ( Jeong Gwan Kim ),정성진 ( Sung Jin Chung ),신석준 ( Seok Joon Shin ),박철휘 ( Cheol Whee Park ),장윤식 ( Yoon Sik Chang ) 대한내과학회 2014 대한내과학회지 Vol.86 No.2

목적: 신부전은 다발성 골수종에서 종종 발생하며 나쁜 예후를 보인다. 아시아의 다발성 골수종의 발생빈도와 특징은 서양과는 다른 것으로 알려져 있다. 이 연구의 목적은 다발성 골수종 환자들에서 신부전 발생의 위험인자 및 치료 후 신기능 회복 인자를 찾고자 하였다. 방법: 2005년부터 2008년까지 처음 다발성 골수종을 진단 받은 환자를 대상으로 하여 신부전의 발생과 관련된 인자를 조사하였고, 12주간의 치료 후에 신부전의 회복과 관련된 인자를 찾았다. 결과: 진단 당시 221명의 환자 중 86명(39%)에서 신부전이 발생하였다. 이변량 로지스틱 회기 분석에서 낮은 헤모글로빈(OR = 0.813, p = 0.02), 높은 베타-2 마이크로글로불린(OR = 1.006, p < 0.01), ACEi (OR = 2.783, p = 0.04) 사용이 신부전 발생의 독립적인 위험인자로 나타났다. 12주간의 치료 후, 86명 중에서 25 (29%)명의 신기능이 회복되었다. 항암치료에 반응을 보인 경우(OR = 6.044, p < 0.01)와 높은 eGFR (OR = 1.084, p < 0.01)이 회복과 연관된 인자로 나타 났다. 결론: 헤모글로빈 수치, 베타-2 마이크로글로불린, ACEi의 사용이 한국 다발성 골수종 환자에 있어 신부전 발생의 독립적인 위험인자이며 항암 치료에 반응여부와 진단 시의 eGFR이 신기능 회복의 예측인자이다. Background/Aims: Multiple myeloma (MM) is frequently accompanied by renal insufficiency, which has been regarded as a poor prognostic factor for MM. It is known that the incidence and characteristics of MM in Asia differ from those in Western countries. The aim of this study was to evaluate risk factors for renal impairment and to investigate reversible factors for renal failure in patients with MM. Methods: Patients newly diagnosed with MM from 2005 to 2008 were included. We investigated factors associated with renal insufficiency and those related to recovery from renal dysfunction after 12 weeks of treatment of MM. Results: Renal failure was recognized in 86 (39%) of 221 patients at diagnosis. In the binary logistic regression analysis, low hemoglobin (odds ratio [OR], 0.813; p = 0.02), high β2microglobulin (OR, 1.006; p < 0.01), and use of angiotensin-converting enzyme inhibitors (ACEi) (OR, 2.783; p < 0.04) at initial presentation were independent risk factors for renal failure in patients with multiple myeloma. After 12 weeks of treatment, 25 of 86 (29%) patients with renal failure had recovered renal function. Good response to chemotherapy (OR, 6.044; p < 0.01) and higher eGFR (OR, 1.084; p < 0.01) were associated with renal function recovery. Conclusions: Levels of hemoglobin and β2microglobulin, and use of ACEi were independent risk factors for the development of renal failure in MM patients. The response to chemotherapy and eGFR at diagnosis significantly influenced recovery of renal function. (Korean J Med 2014;86:190-197)

Venous Anastomosis with Dorsal Veins Using Additional Incisions after Wound Closure in Metacarpophalangeal Joint Level Replantation

Cho, Sang Hyun,Bahar-Moni, Ahmed Suparno,Whang, Jong Ick,Seo, Hyeung Gyo,Park, Hyun Sik,Kim, Ji Sup,Park, Hyun Chul The Korean Society for Microsurgery 2016 Archives of reconstructive microsurgery Vol.25 No.1

In cases of replantation, accurate closure of all structures, including bone, tendons, arteries, nerves, and veins is essential. Among these, the vein is a weaker structure and is damaged severely in most amputation cases. After fixation of bone, repair of tendons, nerves, and arteries, surgeons often experience difficulty in performing venous anastomoses. We found that in such cases, venous anastomosis is easy to perform using an additional incision after closure of the original wound. In a 33-year-old male patient with amputation of all four fingers at the metacarpophalangeal joint level, venous anastomoses were performed with dorsal veins using additional incisions after completion of the fixation of bones and repair of all other structures and closure of the skin due to surgical site tension.

능동 감쇠층을 이용한 아크형태 쉘 모델에 대한 진동특성 연구

고성현(Seong Hyun Ko),박현철(Hyun Chul Park),박철휴(Chul Hue Park),황운봉(Woonbong Whang) 한국소음진동공학회 2002 한국소음진동공학회 학술대회논문집 Vol.2002 No.5

Vascular Dementia 에 關한 韓醫學的 臨床硏究

현경철,김종우,황의완 대한한방신경정신과학회 1999 동의신경정신과학회지 Vol.10 No.1

In order to confirm the efficiency of Oriental medical treatment on Vascular dementia, 24 probable and possible vascular dementia patients diagnosed by ADDTC criteria, were chosen and followed among the patients who had visited KOMC from April, 1996 to March, 1997. They were given herbal and acupuncture therapy, mainly focused on circulating qi(順氣)and removing phlegm(治痰) which is generally applied in early stage of cerebro-vascular disease, and then assessed by the improvement of stage according to the level of impairment, as proposed by APA. The results were as followed. 1. Out of 25 cases, 8 patients showed 2 grade improvement(++), 15 patients showed 1 grade improvement (+), and 1 patient showed no change. 2. The efficiency of treatment is higher when they're given treatment earlier. 3. The efficiency of treatment is higher when their symptoms are lighter. In conclusion, this study shows meaningful effect of Oriental medical treatment on vascular dementia and also shows that It's more effective in the case of short onset and mild symptom.

Millimeter-Scale Growth of Single-Oriented Graphene on a Palladium Silicide Amorphous Film

Kim, Hyun-Woo,Song, Inkyung,Kim, Tae-Hoon,Ahn, Sung Joon,Shin, Ha-Chul,An, Byeong-Seon,Jang, Yamujin,Jeon, Sunam,Kim, Eun Hye,Khadka, Ishwor Bahadur,Gu, TaeJun,Woo, Sun-Hee,Whang, Dongmok,Kim, Youngku American Chemical Society 2019 ACS NANO Vol.13 No.2

<P>It is widely accepted in condensed matter physics and material science communities that a single-oriented overlayer cannot be grown on an amorphous substrate because the disordered substrate randomizes the orientation of the seeds, leading to polycrystalline grains. In the case of two-dimensional materials such as graphene, the large-scale growth of single-oriented materials on an amorphous substrate has remained unsolved. Here, we demonstrate experimentally that the presence of uniformly oriented graphene seeds facilitates the growth of millimeter-scale single-oriented graphene with 3 × 4 mm<SUP>2</SUP> on palladium silicide, which is an amorphous thin film, where the uniformly oriented graphene seeds were epitaxially grown. The amorphous palladium silicide film promotes the growth of the single-oriented growth of graphene by causing carbon atoms to be diffusive and mobile within and on the substrate. In contrast to these results, without the uniformly oriented seeds, the amorphous substrate leads to the growth of polycrystalline graphene grains. This millimeter-scale single-oriented growth from uniformly oriented seeds can be applied to other amorphous substrates.</P> [FIG OMISSION]</BR>

여기상태의 원자를 투과한 Li 이온의 전하변환 단면적에 관한 연구

李鐵柱,高年奎,邊大鉉,黃正男 연세대학교 자연과학연구소 1979 學術論文集 Vol.3 No.-

본 실험에서는 10~60 keV의 에너지 범위에서 기저상태의 He, Ar 및 N_2와 여기 샹태의 He, Ar 및 N_2를 투과한 Li^+이온의 전자포획단면적 σ10와 σ10^*을 측정하였다. 기저상태의 표적물질에 대한 전하변환 단면적은 다른 사람들의 실험 결과 및 개량된 Rapp과 Francis의 이론값과 일치 하였다. 표적원자의 여기상태는 전자 충격법을 사용하여 생성시켰으며, 이때의 여기 단면적은 느린 전자검출법으로 측정하였다. 여기상태의 표적원자에 대한 전하변환 단면적 σ10^*는 기저상태에 대한 σ 보다, He에 대해서는 에너지가 적은 영역에서는 100배, 에너지가 많은 영역에서는 10배나 컸으며 Ar과 N^2에서는 30배에서 5배 정도 컸다. The electron capture cross sections σ10 and σ10^* of Li^+ in ground and metastable state He, Ar, and N_2 have been measured by the growth rate method in the energy range from 10 to 60keV. The cross section for ground state He, Ar and N_2 are in good agreement with other experimental results and with theoretical results from the Rapp and Franchis theory obtained by using an effective ionization potential and a modified impact parameter. The metastable stases of the target atoms were produced by the electron impact method and the excitation cross sections of He(2^3S_1), Ar(3^3P) and N_2 (A^3∑^+_u) were meaured by the trapped electron method. The σ10^* charge transfer cross sections for the metastable state are larger than the σ10 cross section for the ground state by a factor ranging from 10^2 in the lower energy region to 10 in the higher energy region in He, and from 30 to 5 in both Ar and N_2.

Artifact-free Optical Spin-orbit Torque Magnetometry

Jung-Hyun Park,Joo-Sung Kim,Yong-Keum Park,Hyun-Seok Whang,Byoung-Chul Min,Sug-Bong Choe 한국자기학회 2019 한국자기학회 학술연구발표회 논문개요집 Vol.29 No.2