4각 보행로봇의 동적 걸음새 평가

김종년,홍형주,윤용산 대한기계학회 1990 대한기계학회논문집 Vol.14 No.6

In this study the feasibility of a dynamic gait for a given quadruped walking robot is investigated through a computer simulation of the walking with certain drivings of the actuators. Two planar inverted pendulums are used to represent the dynamic model of the leg of the walking robot. It's gait motion is assumed to be periodic and symmetric between left and right sides only with half cycle delay. The dynamics of the walking robot is simplified by introducing two virtual legs to produce two planar inverted pendulums in two orthogonal planes and on the basis that certain legs in pair act as one. The feasibility of the dynamic gait motion is established from the following two necessary conditions:(1) The position and velocity of a foot must satisfy the stroke and velocity requirements.(2) The gait motion should be periodic without falling down. The gait feasibility test was applied to a walking robot design showing the specific acceptable speed range of the robot in trot. Also it showed that the higher body height may produce the faster trot gait.

Teenage pregnancy complicated by primary invasive ovarian cancer: association for oncologic outcome

Erin A. Blake,Madushka Y. De Zoysa,Elise B. Morocco,Samantha B. Kaiser,Michiko Kodama,Brendan H. Grubbs,Koji Matsuo 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.5

Objective: To examine survival of teenage women with pregnancies complicated by primary ovarian cancer. Methods: This is a secondary analysis of a previously organized systematic literature review of primary ovarian cancer diagnosed during pregnancy. Cases eligible for analysis were patients whose age at cancer diagnosis and survival outcome were known (n=201). Pregnancy and oncologic outcome were then examined based on patient age. Results: These were comprised of 95 (47.3%) epithelial ovarian cancers (EOCs), 82 (40.8%) malignant germ cell tumors (MGCTs), and 24 (11.9%) sex-cord stromal tumors (SCSTs). Teenage pregnancy was seen in 21 (10%) cases, and was highest among the SCST group compared to the other cancer types (EOC, 1.1%; MGCT, 14.6%; and SCST, 29.2%, p<0.001). Live birth rates, neonatal weight, full term delivery rates, and Cesarean section rates were similar between the teenage group and the non-teenage group (all, p>0.05); however, teenage pregnancy was significantly associated with an increased risk of serious maternal/neonatal adverse events (50% vs. 22.7%, p=0.013). On univariable analysis, teenage pregnancy was significantly associated with decreased ovarian cancer-specific survival (5-year rate: age ≥30, 79.6%; age 20–29, 87.2%; and age <20, 41.6%; p<0.001). On multivariable analysis controlling for calendar year, cancer type, cancer stage, and gestational age at ovarian cancer diagnosis, teenage pregnancy remained an independent prognostic factor for decreased ovarian cancer-specific survival compared to women aged ≥30 (adjusted-hazard ratio=4.71; 95% confidence interval=1.17–18.9; p=0.029). Conclusion: Teenage women with pregnancies complicated by primary ovarian cancer may be at increased risk of poor survival from ovarian cancer.

24 GHz 공진기 안정화 Gunn 발진기 개발

김종년,김인석 한국전자파학회 2001 한국전자파학회논문지 Vol.12 No.2

본 논문에서는 WR-42 직각도파관을 이용하여 안정적인 출력을 제공하는 구조를 HFSS 시뮬레이션을 통해 설계하여 24 GHz에서 동작하는 공진기 안정화 Gunn 발진기를 개발하였다. 제작된 Gunn 발진기는 아이리스와 캡구조로 공진기 안정화를 이루기 위한 최적의 구조를 구현하였으며 4.5 V 전압의 1.2 A의 전류를 인가했을 때 24.0675 GHz에서 최고출력 +21.27 dBm을 얻을 수 있었다. A cavity stabilized Gunn oscillator at 24 GHz has been developed with WR-42 waveguide structure by HFSS simulation. The oscillator has been optimized by using a circular iris and cap resonator structure. This oscillator needs 4.5 V DC voltage / 1.2 A current and produces a maximum +21.27 dBm RF power at 24.0675 GHz.

제4차 APG-12 회의

김종년,곽기훈,위규진,Kim, Jong-Nyeon,Gwak, Gi-Hun,Wi, Gyu-Jin 한국정보통신기술협회 2011 TTA저널 Vol.133 No.-

철도차량 소음사양의 변화와 저소음화의 역할분담

김종년 한국소음진동공학회 2004 소음 진동 Vol.14 No.2

철도차량 외부소음 예측을 위한 음원모델에 관한 고찰

김종년(Kim Jongnyeun) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월

For external noise prediction of railway vehicles, sophisticated individual source modelling as well as appropriate noise propagation model from the sources is necessary to ensure the accuracy of the predicted results and contributions of each equipment to the overall noise levels. Accurate and reasonable identification procedures of sound sources of equipment including source strength, directivity and positions installed in the train play an important role in a prediction model, since it is not easy to establish a simple model for the sources with a single rule due to the complexity of source characteristics of equipment in size and directivity pattern. This paper guidelines practical considerations for identification of noise sources in railway vehicles including typical source characteristics of several sub-systems that emits noise to the environment, particularly for electric multiple unit(EMU), and verify effectiveness of assumptions used in the modelling of equipment by measurement with a simple part. The predicted external noise level of a complete train using Exnoise, which was developed by Hyundai-Rotem and has been verified in the a lot of field-tests, incorporating source modelling considered in this paper shows close correlation with the measured ones.

통근형 지하철의 실내소음저감

김종년(Kim Jong-Nyeun),유동호(Yoo Dong-Ho),박경환(Park Kyung-Hwan) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-

In this paper, the interior noise reduction for subway railroad vehicles was studied by improving transmission loss of carbody panels and side doors, and on-line tests were conducted to examine the exterior noise levels at various running conditions. Also the transmission loss for design candidates of the carbody specimen was measured in two reverberation rooms. From the results of the tests, side door gap is the most dominant factor affecting the interior noise level of subway railroad cars with a sliding typed side door. The next one is revealed to transmission loss of a floor panel. To improve the transmission loss of the carbody, many activities were conducted such as, treatment of resilient and sound-absorbing materials and reducing the gap of the side door by adopting a brush and rubber, etc. The estimated interior noise level for modified car which is designed with improved carbody panels is lower than original car by about 5㏈.

난간 벽이 있는 고가선로를 운행하는 열차의 외부소음 해석

김종년(Kim Jong Nyeun),박희준(Park Hee Jun) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

The dominant contributors to the wayside noise are wheel/rail interaction noise and propulsion noise when railway vehicles are running on the open ground. Although there are no big obstacles between source and receiver position for the running on typical open section track, parapet walls should be considered to estimate external noise when running on the elevated track. In that case the sound from the train can not directly be propagated and is therefore diffracted to the receiver position. Simple diffraction formulas have not fully described such complicated diffraction of the reflected noise in space between railway car and infrastructure. In this paper, simple modeling method using "virtual source" has been proposed to overcome the gap between the diffraction theory and practical situation. Virtual source can be defined a sound source positioned between railway car and parapet wall. Its source strength can be easily calculated by other commercial software using ray tracing technique. Reasonable agreement is achieved through the experimental validation of the proposed modeling method.

기업 총리스크지수(TRI) 모델의 개발과 측정

김경수,김종년 成均館大學校 韓國産業硏究所 2002 韓國經濟 Vol.29 No.-

As economic uncertainty increases, the financial risk for enterprises is spreading. Based upon these economic situations, this paper proposes a model for measuring the enterprise risk. This model is named TRI(Total Risk Index), which consists of six sectors; financial indicator risk, real price risk, competition risk, customer risk, finance policy risk, and operation risk. The risk of financial institutions can be measured through VaR(Value-at-Risk). But non-financial institutions such as manufacturing companies can possess various types of risk, so this risk can be measured through TRI. The result of measuring TRI for Korea representative enterprises shows that their TRI comprises half of their own capital. This result signifies that the enterprise risk is high. This model can be utilized as Early Warning System for non-financial companies through historically measuring TRI.

정신분열증 환자의 거식증에 관한 정신의학적 연구

이길홍,이수일,김종년,민병근 大韓神經精神醫學會 1975 신경정신의학 Vol.14 No.2

In this study, it was attempted to reveal the psychodynamics and the ideal psychiatric care for the cases with refusal of food in 30 cases of hospitalized schizophrenics including 10 cases of the hyperactive, 10 cases of the underactive, and 10 cases of the paranoid patients admitted to the department of Neuropsychiatry, Chung Ang University Hospital from Jan. 1974 to Dec. 1974. The results were as follows; 1. Among 30 cases of hospitalized schizophrenics, it was revealed that paranoid schizophrenia is highest rate of diagnostic category as 66.7%, the ratio of male to female is 1.7 to 1, and the mean age of total patients is 24.9%. 2. In the analysis of the result, larger numbers of the cases were observed in schizoid personality, of advised admission, of episode of readmission, of hospitalization more than one month, of suspicious and anxious facial expression at the time of hospitalization, whose parents blamed for the refusal of food, yet they are still living with patients, and those cases who were able to start eating with a week. 3. In the psychodynamic explanation, deep seated inner conflicts such as feelings of inferiority, damaged self-esteem, chronic rage, withdrawal and escape from reality are the major roles for the formation of the refusal of food. 4. For the ideal psychiatric care for the cases of refusal of food, it was necessary to set up anxiety-free, warm, and pleasant climate of hospital milieu, so that the milieu therapy, total push therapy, supportive psychotherapy and adequate feeding schedule are highly recommended. 5. Most of the hyperactive schizophrenics showed the schizoid personalty, shorter duration of hospitalization, and anxious, irritable, hostile and aggressive facial expressions. Their psychodynamics are closely related with overtly rejective responses in the frustrated situations arising from their hostile and aggressive impulses similar to those cases of hypertension. And therefore firm approaches such as punishment, isolation, sedation and physical restraint are supposed to be the most effective method of treatment for refusal of food. 6. Most of the underactive schizophrenics showed the episode of being adviced admissions, longer duration of hospitalization, seclusive, withdrawn, mute and depressive facial expressions, longer duration of treatment for refusal of food, and their parents are significant objects for refusal of food. Their psychodynamics are closely related with overtly rejective responses in the frustrated situations by their infantile dependent impulses as seen in the cases of anorexia nervosa. Warm approaches such as formation of pleasant hospital climate, supportive psychotherapy, and total push therapy are supposed to be the most effective method of treatment for the refusal of food in this group. 7. Most of the paranoid schizophrenics showed the paranoid personality, higher age groups, evasive, demanding, cynical and suspicious facial expressions, and their spouses are significant objects for refusal of food. The psychodynamics of the group are closely related with suspicious and projective responses in the frustrated situations by their delusions and hallucinations. Psychotherapy such as reassurance, encouragement, and ventilation are considered to be the most effective method of treatment for the refusal of food.