엘리베이터용 헬리컬기어의 전달오차 해석

박찬일,김대식,Park, Chan-Il,Kim, Dae-Sik 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12

The elevator gear box with the helical gears needs to be developed instead of the one with the worm gears to improve the efficiency. In order to develop the gear box, the analytical tool to predict the helical gear noise is necessary to meet customer's noise requirement. Gear noise is related to the loaded transmission error. Therefore, the simulation program fer the loaded transmission error analysis of the helical gears is developed in this study. Using the developed program, the effects of tooth modification such as tip relief and the extent of tip relief are investigated. Finally, the procedures to determine the tip relief and the extent of tip relief are proposed.

N-(2,4-dinitrophenyl)benzhydrazonyl Bromide 유도체의 가수분해 반응메카니즘

박찬일,차기원,이익춘,장병두,Park, Chan Il,Cha, Ki Won,Lee, Ik Choon,Chang, Byung Du 대한화학회 1997 대한화학회지 Vol.41 No.4

N-(2,4-dinitrophenyl)benzhydrazonyl bromide 유도체들의 가수분해 반응속도상수를 20$^{\circ}C$의 수용액에서 자외선 분광광도법으로 측정하여 넓은 pH 범위에서의 반응속도식을 구하였다. 반응속도식, 용매효과, 치환기 효과, 염효과, 열역학적 활성화 파라미터 등의 결과로부터 가수분해 반응메카니즘을 제안하였다. 즉, pH 3.0에서는 carbonium ion 중간체를 거쳐 SN1 반응에 의해 진행되며, pH 10.0에서는 1,3-dipolar 반응 메카니즘 또는 SN2 반응에 의해 진행됨을 제안하였다. The rate constants for the hydrolysis of N-(2,4-dinitrophenyl)benzhydrazonyl bromide and its derivatives were determined by ultraviolet visible spectrophotometry at 20$^{\circ}C$ and a rate equation which could be applied over a wide pH range was obtained. On the basis of rate equations derived and judging from the solvent effect, substituent effect, salt effect, thermodynamic parameter, plausible mechanisms of hydrolysis have been proposed. It may be concluded that the hydrolysis through SN1 mechanism via carbonium ion intermdiate to pH 3.0, and pH 10.0, the hydrolysis proceeds through 1,3-dipolar or SN2 mechanism.

스퍼터링 질화탄소 박막의 트라이볼로지 및 전기적 특성의 기판 온도 영향

박찬일,Park, Chan Il 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.1

Using facing target magnetron sputtering (FTMS) with a graphite target source, carbon nitride thin films were deposited on silicon and glass substrates at different substrate temperatures to confirm the tribological, electrical, and structural properties of thin films. The substrate temperatures were room temperature, 150℃, and 300℃. The tribology and electrical properties of the carbon nitride thin films were measured as the substrate temperature increased, and a study on the relation between these results and structural properties was conducted. The results show that the increase in the substrate temperature during the fabrication of the carbon nitride thin films increased the hardness and elastic modulus values, the critical load value was increased, and the residual stress value was reduced. Moreover, the increase in the substrate temperature during thin-film deposition was attributed to the improvement in the electrical properties of carbon nitride thin film.

Xylenol Orange가 결합된 양이온 교환체에 의한 금속이온의 농축 및 Fe(III)의 분리

박찬일,김현수,차기원,Park, Chan Il,Kim, Hyun Soo,Cha, Ki Won 대한화학회 1999 대한화학회지 Vol.43 No.6

Xylenol Orange was bonded on an anion-exchange resin (Amberlite lRA 400, in $Cl^-$form) by batch equilibration. The resin was proved to be stable in acidic solutions of about 0.1 M HCl, $HNO_3$ or $H_2SO_4$. Sorption capacities for the metal ions on the Amberlite IRA 400 bonded with xylenol orange have been measured by batch method. The result showed that Fe(III) is higher than any other metals for sorption capacity. The preconcentration and the separation of Fe(lll) from the mixture soIution, therefore, were carried out with the 0.1 M sulfosalicylic acid as an eluent. 뱃치법을 이용하여 음이온 교환수지(Amberlite IRA 400, $Cl^-$형)에 Xylenol Orange를 결합시킨 수지를 얻었다. 이 수지는 0.1 M 정도의 무기산에서 안정하였으며, Xylenol Orange가 결합된 Amberlite lRA-400 수지의 금속 이온들에 대한 흡착능을 측정해 본 결과, Fe(lll) 이온의 흡착력이 다른 이온에 비해 컸다. 따라서 Fe(III) 이온을 예비 농축할 수 있었으며 다른 이온으로 부터 분리하는데는 용리액으로 0.1 M sulfosalicylic acid 용액이 사용되었다.

Postoperative Radiation Therapy in Non-Small-Cell Lung Cancer

박찬일,김종훈,김주현,Park, Charn-Il,Kim, Jong-Hoon,Kim, Joo-Hyun The Korean Society for Radiation Oncology 1988 Radiation Oncology Journal Vol.6 No.2

Sixty patients with proven lung cancer were retrospectively studied to determine whether postoperative radiation therapy improves survival. Patterns of treatment failure and 5 year survival were assessed according to extent of tumor spread, histology, type of operation, positive resection margin and radiation dose. Of the 60 patients, excluding S patients who received incomplete treatment or poor pulmonary function,55 patients received postoperative radiation therapy following curative resection. The overall survival at 5 years was $39\%$. The hilar and mediastinal lymph node involvement had an influence on survival. The authors recommend that patients with resection. lung cancer involving the hilar and mediastinal lymph nodes may require postoperative radiotherapy to reduce the local recurrence and improve survival. 최근 폐암의 발생빈도는 높아지고 있으나, 아직까지 만족할 만한 치료 성적은 제시되시 많고 있으며, 현재로서는 가능한 한 초기에 발견하여 수술을 시행후 국소재발 위험군의 경우 방사선 치료를 시행하는 것이 최선의 방법으로 알려져있다. 이에 저자들은 1979년 3월부터 1986년 2월까지 서울대학교 병원에서 비소세포성 폐암 진단하에 근치적 절제수술 시행후 방사선 치료를 받은 60명의 환자를 대상으로 수술후 방사선 치료의 효과 및 예후인자에 대한 분석을 시행하여 다음과 같은 결과를 얻었다. 전체 환자 60명중 방사선 치료를 불완전하게 시행한 5명을 제외한 55명을 분석한 결과 전체 환자의 5년 생존율은 $39\%$였으며 무병생존율은 $29\%$였다. 환자의 예후를 결정하는 주요인자로서는 병기 및 국소 임파절 전이 여부였고, 1병기와 병리조직학적 분류 및 나이, 성별, 방사선 조사선량과 수술시 절제면의 종양 침범 여부는 예후에 큰 영향을 미치지 못하였다. 수술 시행후 방사선 치료를 받은 환자 군의 생존율은, 문헌상에 나타난 수술 단독 시행 환자군의 생존율과 비교해 볼 때 국소 임파절 전이가 있는 환자군에서 더 높은 결과를 보였으며, 임파절 전이가 없는 환자군에서는 큰 차이를 발견할 수 없었다. 국소 재발율도 임파절 전이가 있는 환자군에서는 수술 단독 시행 환자군보다 현저히 낮은 결과를 보여 수술후 방사선 치료가 임파절 전이가 있는 환자에게는 생존율의 증가 및 국소재발 억제의 효과를 나타냄을 관찰할 수 있었다.

Ge(Ⅳ)-Mercaptoacetic Acid 착물에 의한 흡착벗김 전압-전류법

박찬일,성숙희,차기원,Park, Chan Il,Seong, Suk Hee,Cha, Ki Won 대한화학회 1999 대한화학회지 Vol.43 No.1

The adsorptive stripping voltammetric determination method of trace germanium (IV) using mercaptoacetic acid as a ligand was studied. Optimal conditions were found to be 0.25 M NaCl solution (pH 6.0) containing mercaptoacetic acid concentration of $5.0{\times}10^{-6}M$. The peak potential appeared at - 1.402 V vs. Ag/AgCl. Effects of sodium chloride concentration, mercaptoacetic acid concentration, and accumulation time for the complex of Ge(IV)-Mercaptoacetic acid on the peak current were studied. Amberlite IRC-718 chelating resin was applied to the separation of Ge(IV) from other metal ions. Mercaptoacetic acid를 이용하여 흡착벗김 전압전류법으로 미량의 게르마늄을 정량하는 방법을 연구하였다. 이때 지지전해질은 0.25 M NaCl 용액(pH 6.0)을 사용하였고, mercaptoacetic acid의 농도는 $5.0{\times}10^{-6}M$이 되도록 조절하여 실험하였다. Ge(IV)-Mercaptoacetic acid 착물의 봉우리 전위는 -1.402V vs. Ag/AgCl에서 나타났다. 착물의 봉우리 전위에 미치는 NaCl의 농도, mercaptoacetic acid의 농도, 축적 시간등에 대하여 조사하였다. 또한, Amberlite IRC-718 킬레이트 수지를 다른 이온들로 부터 Ge(IV)을 분리하는데 적용하였다.

Spectrophotometric Determination of Iron with 2-Hydroxybenzaldehyde-5-nitro-pyridylhydrazone after Separation with Amberlite XAD-7 Nonionic Resin

박찬일,장병두,정덕채,차기원,Park, Chan Il,Chung, Byung Doo,Jung, Duck Chae,Cha, Ki Won Korean Chemical Society 1999 대한화학회지 Vol.43 No.5

2-Hydroxybenzaldehyde-5-nitro-pyridylhydrazone(2HB-5NPH)를 합성하여 철의 분광학적 정량에 응용하였다. 이 시약은 pH 6.0-7.5 범위에서 철과 반응하여 메탄올 용액에서 매우 안정한 노란색의 1:2킬레이트를 형성한다. 철의 농도범위가 0.05∼2.0 ${\mu}gmL^{-1}$일 때 Beer's law에 적용되고 미량의 철을 분광학적으로 정량하기 위하여 Amberlite XAD-7 비이온성 킬레이트 수지로 채워진 짧은 컬럼을 사용하여 분리과정에 적용하였다. 몇가지 이온들의 방해 효과를 연구하였다. 혼합용액으로부터 철이온의 분리는 완충용액(pH 5.0)과 용리액으로서 0.25M HCl을 가지고 수행하였다. 2-Hydroxybenzaldehyde-5-nitro-pyridylhydrazone (2HB-5NPH) was synthesized and its application to the spectrophotometric determination of iron was studied. The reagent reacts with iron in the pH range 6.0-7.5 to form a yellow coIored 1:2 chelate which is very stable in methanol solution. Beer's law is obeyed in the concentration range 0.05∼2.0 ${\mu}gmL^{-1}$ iron and separation procedure using a short column filled with Amberlite XAD-7 nonionic chelating resin is proposed for the spectrophotometric determination of traces of iron. The influence of several ions as interference was discussed. The separation of Fe(III) ion from the mix-ture solution were carried out with the buffer solution (pH 5.0) and 0.25M HCl as eluents.

치형오차를 가진 헬리컬기어의 진동특성에 관한 연구

박찬일,이장무,Park, Chan-Il,Lee, Jang-Moo 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.5

Gear vibration is caused by the mesh stiffness, gear accuracy, and assembling errors. For these reasons, helical gear has the azial, radial, and rotational vibrations. In this study, the mesh stiffness is calculated by considering the tooth bending, contact, and foundation deformations. Rotational vibration of helical gear with tooth error is modeled by the nonlidear equation of motion with single degree of freedom and is anlyzed numerically. Also, by a specially designed experimental set-up, the analysis are cross-checked and the vibration characteristics of helical gear are discussed.

축과 베어링 변형을 고려한 헬리컬 기어의 전달오차 해석

박찬일,조도현,Park, Chan-Il,Cho, Do-Hyun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10

Transmission error is highly related to gear noise. In order to predict the helical gear noise, transmission error analysis is needed. Up to now, the studies for the transmission error were conducted by the modeling of helical gears only. However, since helical gears are supported by the shaft and bearing, transmission error has the effects of the elements. In this study, the procedure to consider the shaft deformation with bearing stiffness for the transmission error analysis is proposed. To do so, the relationship between gear error and shaft deformation is analytically derived. Shaft deformation with bearing stiffness is analyzed by FEM. It is measured in the experimental test rig by the non-contact displacement sensors. Using the tooth error from tooth modification and the shaft deformation, the effects of shaft on the loaded transmission error are investigated.

Squamous Cell Carcinoma of the Supraglottic Larynx Treated with Radiation Therapy

박찬일,김광현,Park, Charn-Il,Kim, Kwang-Hyun The Korean Society for Radiation Oncology 1989 Radiation Oncology Journal Vol.7 No.1

1979년 3월부터 1984년 2월까지 성문상부의 편평상피암으로 진단되어 근치적 방사선치료를 시행한 66명을 대상으로 치료성적을 분석하였다. 전체 환자군의 최소 추적기간은 4년이었다. 진단당시 전체 환자군의 $78\%$가 T3 T4 병변이었고 임파절 전이율은 $58\%$이었으며, 전체 환자군의 5년 생존율은 $31.3\%$, 병기에 따른 생존율은 병기 II, III, IV에서 각각 $60.7\%,\;46.7\%\;및\;13.5\%$이었다. 3명의 환자$(5\%)$에서 원격전이가 관찰되었으며 수술을 요하는 주부작용률은 $11\%$이었다. 방사선치료 후 잔유병변 또는 재발에 대한 구제수술 성공률은 $57\%$이었다. 병기 I, II및 병기 III 초기의 성문상부암은 방사선 단독 치료만으로도 높은 근치율과 생존자의 성대기능 보존이 가능 하나, 병기 III과 IV의 성문상부암 환자 중 경부에 전이된 임파절의 절제가 가능한 환자는 수술과 방사선치료의 병용이 권장된다. Sixty-six patients with squamous cell carcinoma of the supraglottic larynx received irradiation with curative intent between 1979 and 1985 were retrospectively analysed. All patients had a minimum follow-up of 4 years. Of the entire group consisting of $73\%$T3 and T4 lesions and $58\%$ lymph node metastases, a 5-year acturial survival rate was $31.3\%$. A 5-year acturial survival rates for stage II, III and IV were $60.7\%,\;45.7\%\;and\;13.5\%$ respectively (p<0.05). Patients without lymphnode metastases had better survival rate than those with postive lymphnode metastases $(54.8\%\;vs\;12.2\%)$ (p<0.005). Surgical salvage rate w8s 4/7 $(57\%)$. Three patients developed distant metastases. Major complications requiring surgery were seen in $11\%$, Radiation therapy alone with surgical salvage was an effective, voice preserving treatment for stage I, II and selected III carcinoma of the supraglottic carcinoma, however planned combined treatment with surgery and radiation therapy is advised for stage III and IV carcinoma of the supraglottic larynx with resectable neck disease.