자동차 조향장치 마찰용접부의 기계적 성질에 관한 연구

길남규,성기완,안창윤,민택기 충남대학교 공업교육연구소 1999 論文集 Vol.22 No.1

This study deals with the mechanical properties of welding part, by friction welding of SM45C steel rod and SWS41A yoke which have being used Steering-Joint. The experimental results are summrized as follows ; 1. When CO₂welding is replaced with friction welding, we can get benefit manufacture. 2. The result of tensile test showed the highest tensile strength of 612MPa(150% of base metal strength 402MPa). 3. The result of bending test showed the highest bending strength of 1066MPa(80% of base metal strength 1259MPa).

융모성 질환의 임상적 연구

남상륜,손영선,이영일,노흥태,강길전 충남대학교 의과대학 지역사회의학연구소 1989 충남의대잡지 Vol.16 No.2

Seventy nine cases of trophoblastic disease were analyzed at the Department of Obstetrics and Gynecology, Chungnam National University from January, 1985 to October, 1989. The results are as follows: 1. Incidence of trophoblastic disease was one per 31.8 deliveries(3.15%), and it was pathologically consisted with partial mole(27.8%), complete mole(45.6%), invasive mole (17.7%), choriocarcinoma(8.9%). 2. Age group of 26 to 30 was found most frequent(40.5%) and primipara was the most frequent group(43.0%). There was no increase for the persistent disease according to age and para. 3. Clinical manifestations were vaginal bleeding(91.1%), the most common, nausea and vomiting(20.3%), abdominal pain(10.1%) and etc. 4. Molar pregnancies with excessive uterine enlargement were found in 35.6% and were at increased risk for the persistent disease. 5. Antecedant pregnancies prior to trophoblastic disease were abortion(43.0%), term pregnancy(16.5%) and molar pregnancy(16.5%). 6.β-hCG concentration before November, 1986 was significantly lower than after ten. And the first postevacuation β-hCG level was increased in cases of the persistent disease. 7. The treatment regimens in molar pregnancies were suction curettage with prophylactic Act-D(41.4%) and without Act-D(43.1%), hysterectomy with Act-D(13.8%), and hysterotomy(1.7%). There was no difference in complication persistent disease between with and without prophylactic chemotherapy. 8. Non-metastatic and metastatic low risk patients were treated with hysterectomy with or without MTX-CF(66.7%), curettage with MTX-CF, Act-D or MAC(33.3%) to attain remission without failure. All metastatic high risk patients were treated with hysterectomy with 1-6 courses of MAC triple chemotherapy except 1 case of death from respiratory failure and 1 lost case. 9. Side effects after chemotherapy include gastrointestinal symptoms(91.1%), fever(57.8%), leukopenia(49.0%), hepatotoxicity(46.9%), stomatitis(40%), alopecia(28.9%), thrombocytopenia(15.3%) and etc, in order of frequency.

株當本數에 따른 油菜의 生育, 靑刈收量 및 組成分 變化

趙南棋,劉哲受,姜榮吉,宋昌吉,趙英一 濟州大學校 亞熱帶農業硏究所 1999 亞熱帶農業硏究 Vol.16 No.-

ABSTRCT Four rape cultivars were grown at 1 to 5 plants per hill to investigate the effects of the number of plants per hill on major agronomic characters of forage rape in Cheju volcanic soil. Days to flowering of Sparta was 191 days, those of Ramon and Youngsanyuchae were 189 and 188 days, respectively. And that of Hallayuchae was 180.3 days. Days to flowering decreased as number of plants per hill was increased. Sparta was tallest (153.6cm), while Hallayuchae was shortest (131.8cm). Plant height with three plants per hill( 155.3cm) was longest, while with 5 plants per hill(131.8cm) was shortest. The number of branches, stem diameter, leaf length and leaf width gradually decreased as the number of plants per hill were increased. Sparta had the greatest fresh and dry matter, total digestible nutrient (TDN) and crude protein yields, while Hallayuchae had the least. Fresh yield were greatest (7,544 kg) at the three plants per hill. Dry matter TDN, and crude protein yields were also greatest (7,544 kg) at the three plants per hill. Ramon had the greatist SPAD reading (44.7) while Youngsanyuchae had the lowest (40.7). SPAD reading were highest (44,1) in the one plant per hill plot but decreased as the number of plants per plant was increased. Sparta had greater contents of crude fiber and crude ash, but Hallayuchae and Youngsanyuchae had lower contents. The content of crude protein, crude fat, nitrogen free extract(NFE) and TDN were increased as number of plant per hill were increased. But the contents of crude fiber and crude ash were decreased as the number of plants per hill was increased.

栽植密度에 따른 油菜의 生育, 靑刈收量 및 粗成分 變化

趙南棋,劉哲受,姜榮吉,宋昌吉,趙榮一 濟州大學校 亞熱帶農業硏究所 1999 亞熱帶農業硏究 Vol.16 No.-

ABSTRACT Four cultivars of rape were grown at 5 planting densities in Cheju volcanic soil to investigate the effects of planting density on major agronomic characters of forage rape. Hallayuchae flowered earliest (180 days) while Sparta latest(191 days). Days to flowering was reduced as planting density was decreased. The average plant height of Sparta was 162.2cm and that of Ramon and Youngsanyuchae was 158.4 and 138.6cm, respectively. In 10 X 10cm planting density plot, plant height was 152.5cm and it was gradually decreased as planting density was decreased. The number of branches, stem diameter, leaf length and leaf width of Ramon was greatest, while those of Hallayuchae were least. These variables were increased as planting density was decreased. Fresh forage yield (5,719kg/10a) and dry matter yield (1,229kg/10a) for lOxlOcm planting density plot, were greatest, but those were gradually decreased as planting density was decreased and those for 30 X 30cm planting density plot were 4,232kg/10a and 906kg/10a respectively. Crude protein yield and total digestable nutrient (TDN) per lOa was positively correlated with fresh forage yield and dry matter yield. Sparta produced the greatest fresh forage, and Hallayuchae produced the smallest. Sparta had the highest SPAD reading value, and Hallayuchae had the lowest. SPAD reading was reduced in proportion to increased planting density. Sparta had greater crude protein yield, and crude fat, nitrogen free extract (NFE) and TDN contents and Youngsanyuchae and Hallayuchae had lower contents while Youngsanyuchae and Hallayuchae had greater crude fiber and crude ash contents and Sparta had lower contents. Crude protein yield, and crude fat. NFE and TDN contents were decreased as planting density was decreased, while crude fiber and crude ash contents were increased as planting density was decreased.

窒素分施에 따른 Subangrass계 雜種의 生育, 收量 및 飼料成分 變化

趙南棋,朴成埈,姜榮吉,宋昌吉 濟州大學校 亞熱帶農業硏究所 1998 亞熱帶農業硏究 Vol.15 No.-

ABSTRACT Two sudangrass hybrids were treated with the split application (1, 2, 3, 4, and 5 times) of 25 kg/lOa of N to determine the effects of split N application on the growth, yield and feed composition of sudangrass hybrids in Cheju. Pioneer 988 headed five days earlier than Pioneer 931 did. The number of days from planting to heading averaged across the two hybrids was delayed from 73 to 79 days as the frequency of the split N applications was increased from one to five times. At heading, Pioneer 988 was about 8cm taller than Pioneer 931 was. Plant height was increased with increasing the frequency of split N application. As the frequency of split N application was increased, stem weight, leaf weight, root length, and root weight were significantly increased. Fresh forage yield averaged the two hybrids was increased from 5,505 to 7,391 kg/lOa as the frequency of the split N application was increased from one to five times. As the frequency of the split application was increased, crude fat and crude protein contents also were increased but crude fiber content was decreased.

앞작물 재배와 질소 시비량의 차이에 따른 이탈리언라이그라스의 청예 수량

강영길,조남기,고영우,강민수,김용찬 濟州大學校 亞熱帶農業硏究所 1998 亞熱帶農業硏究 Vol.15 No.-

앞작물 재배와 질소시비량이 이탈리언라이그라스의 건물수량에 미치는 영향을 구명하기 위해 1997년 제주에서 콩(백운콩, 남해콩, 소백나물콩), 녹두(금성녹두, 남평녹두), 팥(충주팥), 동부(제주재래), 수수류(Pioneer 931, Pioneer 988). 옥수수(Pioneer 3525)를 기준시비하에서 재배한 후, 질소 0, 40, 80kg/ha 시용하여 1997-1998년에 재배했던 이탈리언라이그라스의 포장 건물수량, 건물율 등을 조사한 결과를 요약하면 다음과 같다. 초장, 건물수량, 건물율은 모두 앞작물재배에 의하여 유의한 영향을 받지 않았고 앞작물과 질소시비량간의 상호작용도 유의하지 않았다. 초장과 건물중은 질소시비량의 차이에 따른 큰 차이가 있었으나 건물율은 질소시비량의 차이에 빠른 차이가 거의 없었다. 초장과 건물중은 질소시비량이 0, 40, 80kg/ha에서 각각 99.5. 118.1, 120.1cm와 5.77, 7.23, 7.70ton/ha이었다. 질소이용효율은 질소 40kg/ha 시용구에서 180.8kg이었던 것이 80kg/ha 사용구에서 96.3kg로 줄어들었다. 건물수량과 질소이용효율을 고려할 때 늦가을에 파종한 이탈리언라이그라스의 적정 질소시비량은 약 80kg/ha으로 판단된다. After soybean (3 cu1tivars), mungbean (2 cultivars), cowpea, adzuki bean, maize, sorghum, sorghum × sudangrass hybrid, and Japanese millet were harvested for forage in 1997. Italian ryegrass was grown at three N rates (0, 40, and 80kg/ha) at Cheju in a 1997-1998 crop season to evaluate the effects of previous cropping and N rate on the dry matter yield of Italian ryegrass. Plant height, dry matter yield and dry matter content were not influenced by the previous cropping. There was no significant interaction between previous cropping and N rate for the three traits. Plant height and dry matter yield were significantly affected by N rate but dry matter content was not. Averaged across the previous croppings, plant heights and dry matter yields at 0, 40, and 80kg N/ha were 99.5, 118.1, and 120.1 cm and 5.77, 7 23, and 7.70 t/ha, respectively. Nitrogen use efficiency decreased from 180.8 to 96.3 kg dry matter per kg N applied as N was increased from 40 to 80 kg/ha. The optimum N rate for Italian ryegrass planted in late fall at Cheju appeared about 80kg/ha in terms of dry matter yield and N use efficiency.

전자상거래의 보안

이길남 京畿專門大學 2001 京畿專門大學 論文集 Vol.- No.29

Electronic Commerce(EC) may be defined as the entire set of process that support commercial activities on a network and information analysis. These activities spawn product information and display events, service, providers, consumers, advertisers, support for transactions, brokering systems for a variety of services and actions, security of transactions, user authentication, etc. Developments in information technologies in recent years have enabled major advances in several areas, including electronic commerce. EC has experienced an explosion due to the convergence of these technological developments, the merging of the telecommunications and computing industries, and the appropriate business climate. The development and impact of EC as a market, research and development area involve issues that are of an interdisciplinary nature. The underlying aspects of EC fall primarily in two areas, these are, business and technology. In addition to technical and business issues, EC implies a large process. Developments in EC are affected by, and have an impact on, a number of other areas including legal and public policy, social and behavioral as well as fundamental economic topics. In order to effectively use EC, users of such systems require various types of wide ranging functionalities that include the ability to search and access relevant information efficiently, secure business transactions against intentional and unintentional corruption and theft of data. To perform a global EC successfully, first data may already exist in digital form but in a legacy format that must be transformed to be useful. Second, as new information is made available by information providers we need to have mechanisms to capture and store this information. System of EC have to be secured against a number of threats such as fraudulent activities by internal and external sources, theft of valuable information. Hence such systems need to be guarded by some specially designed security system to provide security services such as authentication of data and of the entities accessing the system, confidentiality, data integrity, and non-repudiation. Security systems typically consists of a cryptographic system that performs the encryption of plain text data into ciphertext and decryption of ciphertext back into plain text data. Cryption systems can be divided into two categories, these are, a symmetric key cryptosystem where the key information in shared and kept secret between the sender and receiver, and a public key cryptosystem where the sender and receiver do not share the same key. The legal issues involved in EC relate to the trouble the Internet itself has in dealing with law in cyberspace. Law enforcement, ubiquitous cryptography, and contractual issues are all unsettled in the growing EC industry.

광대역 접속 시스쳄에 대한 블라인드 등화 기법 분석

오길남 광주대학교 2001 産業技術硏究 Vol.15 No.-

본 논문에서는 최근에 급속히 확장되고 있는 광대역 접속 시스템에 대한 블라인드 등화기법을 기술하였다. 먼저, 다양한 블라인드 등화 알고리즘의 개념을 소개하고, 오차 신호 발생을 위해 적용한 비선형 추정기의 특성을 분석하여 알고리즘의 성능과 장단점을 비교하였다. 다음, 현재 DSL 방식 중 가장 널리 사용되고 있는 ADSL과 차세대 초고속 가입자 접속 기술인 VDSL 등에 적용하기 위한 블라인드 등화 기법에서 요구되는 특성을 조사하고, 이를 만족시키기 위한 대책을 논의하였다. 또한 블라인드 등화 알고리즘의 성능을 개선하기 위해 고려해야 할 점을 기술하고, 이에 대한 새로운 연구 결과 등을 함께 제시하였다. This paper discusses the blind equalization techniques for emerging broadband access applications. First, the general concepts of the various blind equalization algorithms are introduced and their performance and properties are compared via the analysis of nonlinear estimators used for error signals generation. Next, investigated are the requirements of the blind equalization for its use in the dominant DSL technology of today (ADSL) and the next and highest-speed generation of DSL (VDSL), and the methods to cope with the requirements are discussed. The considerations for performance improvements of the blind equalization algorithms are described, and new results obtained recently for these applications are also presented.

海上保險契約과 그 效力에 관한 考察

이길남 京畿專門大學 2000 京畿專門大學 論文集 Vol.- No.28

This paper is to review on Marine Insurance Contract and its effectiveness such as Maritime perils and Liabilities of each contract party concerned. A contract of marine insurance is a contract that the insurer undertakes to indemnify the assured, in manner and the extent thereby agreed, against marine losses, that is to say, the loss incident to marine adventure. Upon fixing the contract, the insurer and the assured take each own liabilities to perform the contract. The insurer must issue insurance policy to the assured and undertakes to indemnify the assured for the loss and damage due to the maritime risk mentioned in the contract. On the other hand, the assured must pay premium against the insurer's liabilities and bound to disclose every material circumstance. Finally, the assured does his best to do a suing and labouring engagement stipulated in the contract and he may recover from the insurer any expenses incurred to the contract notwithstanding that the insurer may have paid for beyond the insurance amount.

一部農村地域 靑少年層의 成長發育과 體容積·體脂肪量에 關한 硏究

申吉洙,朴喆斌,南炳執,朴淳永 圓光大學校 附設 體力科學硏究所 1981 體力科學硏究 Vol.4 No.-

A study on 3,663 middle and high school students(1790 boys and 1873 girls) in rural areas of Jeonla Province was conducted from May I to July 30 in 1978 for assessing their physical growth and development in terms of physical and nutritional indices, and the correlation between body weight and volume is obtained. Following are the results. A. Physical Growth and Development. 1. Rapid growth of physical grovth in terms of body height, weight, chest-gi-rth and sitting height has been observed among 17 year-old boys and 15 year-old girls. Growth in terms of physical growth and development turned out to be slower among students of higher ages, irrespective of male of female. 2. The maximum annual growth rates were as follows; Body Height ; 6.0㎝ during the age 16∼17 for boys. 5.2㎝ during the age 12∼13 for girls. Body weight ; 6.4㎝ during the age 14∼15 for boys. 6.0㎝ during the age 12∼13 for girls. Chest-Girth ; 4.3㎝ during the age 14∼15 for boys. 5.0㎝ during the age 12∼13 for girls. Sitting Height ; 3.3㎝ during the age 13∼14 for boys. 2.8㎝ during the age 12∼13 for girls. B. Various Indices about Physical Growth and Development. 1. The lineal increase of relative body weight was shown in both sex groups belonging to the ages 11∼17. 2. As for relative chest girth, it is small in the age of 15 for boys and 12 for girls, but when they are 16 and 13, respectively, it becomes normal. 3. In both sex groups, the growth rate was shown to be constant nearly to the same degree. 4. Rohrer index was 1.1∼1.2 for boys and 1.2∼1.3 for girls. 5. The Kaup index was lower than 2.0 for boys under 15 years of age and for girls under 14 years of age. It become higher than 2.0 after they reach 16 and 15, respectively. 6. Vervaeck index was 76.9∼89.7 for boys and 78.5∼89.0 for girls. For both cases it increased with age. 7. Pelidisi index of the nutitional status was obtained 91∼92 for boys and 89∼95 for girls. C. Correlation between Body Weight and Body Height. The correlation coefficient between body height and weight is as show in Table 12. D. Standard Body Weight by Age. The equation of the standard body weight is as shown in Table 12. E. Body Volume. Mean values of body surface area(㎡), body volume(ℓ), and body density(㎏/ℓ) were calculated by an indirect method from body height and weight, as shown in Table 13. F. Body Fat Weight. The percentage of mean body fat content was 10.84±1.83 to 13.88±2.15% for boys and 22.28±2.55 to 25.60±3.99% for girls, respectively. G. Correlation between relative Body Weight and Body Volume by age. The correlation coefficient and equation between relative body weight and volume by age are an shown in Table 14.