ISO 9000 has brought about significant positive effects to the quality management system and quality improvement. This paper develops effective and flexible ISO 9000 quality system based on telecommunication manufactured goods with CSU(Channel Service Unit), ADSL(Asymmetric Digital Subscriber Line), Fiber Optic Multiplexer, HDSL(High-bit-rate Digital Subscriber Line), FDSU(Flexible Data Service Unit), 73 DSU(Digital Service Unit). The case studies of venture telecommunication corporation in establishing ISO 9000 qualify system are also discussed.

The ionosphere, the atmosphere of the earth ionized by solar radiations, has been strongly varied with solar activity. The ionosphere varies with the solar cycle, the seasons, the latitudes and during any given day. Radio wave propagation through or in the ionosphere is affected by ionospheric condition so that one needs to consider its effects on operating communication systems normally. For examples, sporadic E may form at any time. It occurs at altitudes between 90 to 140 km (in the E region), and may be spread over a large area or be confined to a small region. Sometimes the sporadic E layer works as a mirror so that the communication signal does not reach the receiver. And radiation from the Sun during large solar flares causes increased ionization in the D region which results in greater absorption of HF radio waves. This phenomenon is called short wave fade-outs. If the flare is large enough, the whole of the HF spectrum can be rendered unusable for a period of time. Due to events on the Sun, sometimes the Earth's magnetic field becomes disturbed. The geomagnetic field and the ionosphere are linked in complex ways and a disturbance in the geomagnetic field can often cause a disturbance in the F region of the ionosphere. An enhancement will not usually concern the HF communicator, but the depression may cause frequencies normally used for communication to be too high with the result that the wave penetrates the ionosphere. Ionospheric storms can occur throughout the solar cycle and are related to coronal mass ejections (CMEs) and coronal holes on the Sun. Except the above mentioned phenomena, there are a lot of things to affect the radio communication. Nowadays, radio technique for probing the terrestrial ionosphere has a tendency to use satellite system such as GPS. To get more accurate information about the variation of the ionospheric electron density, a TEC measurement system is necessary so RRL will operate the system in the near future.

우리나라 경제 구조는 대부분의 수익이 반도체등 몇 가지 제품에 한정되어 있으며 이들 제품들은 이미 성숙기에 접어들고 있어 성장성을 기대하기 어려운 실정이다. 따라서 다양화하는 시장 수요에 대응하고, 첨단 기술을 개발하기 위해서는 창조성과 시장 변화에 유연한 벤처 비즈니스가 요구된다. 본 연구에서는 벤처비지니스중 통신산업분야의 품질시스템에 대하여 W사 사례연구를 통한 효율적이고 효과적인 구축방안을 제안하고자 한다. W사 ISO9001 품질시스템 요건 및 업무분장에 따른 문서와 기록을 기초로 CSU, ADSL, 광전송장비, HDSL, FDSU, T3 DSU등의 첨단 통신제품들을 품질시스템 유형별로 자체생산제품, 제휴판매제품, 도입판매제품으로 분류하고, 제품 특성별로 비교 분석하여 제품별 유연한 품질시스템 구축방안을 제시하고자 한다.

This paper describes a Frequency Shift Keying (FSK) modulator and demodulator and the experimented underwater data ommunication equipment to transfer the analog echo signal in real-time from an underwater vehicle to the mother ship. The system consists of an echo signal transfer unit equipped to the vehicle and an ultrasonic receiver equipped on the ship. The former includes an ultrasonic transceiver unit of 180kHz for echo detection and a continuous wave transmitter of 50kHz with a FSK modulator for echo transmission to the ship. The latter includes an ultrasonic receiver of 50kHz and the FSK demodulator. The results of experiment are as follows. 1. The characteristics of the FSK modulating and demodulating circuits designed with the use of C-MOS IC 4046 was good and confirmed its usefulness in underwater data communication system.2. The prototype ultrasonic transceiver unit shows profitable driving power while the pulse duration was short less than 3 msec, but it was found that the driving power is not sufficient while the long pulse duration or continuous wave is used. The gain of the ultrasonic receiver was 80 dB and the receiving bandwidth 700Hz (at - 3 dB point).3. It was found that the system designed by the author has some possibility to use in underwater echo transfer.4. At the FSK modulator, the widths of voltage and frequency which represent linearity were 3.5 V, 1600Hz, respectively, at the FSK demodulator 2.6 V, 700Hz, respectively.

The following demonstrates similarities between Japanese and Korean food culture. The facts have been discovered through the examination of records kept by Korean Communication Facilities and Japanese Envoys. Both countries used the numbers 7, 5, 3, in food treats. Both demonstrated Da do(茶道) style during banquet. Japanese Na-ra-dae(奈良臺) is similar to Korean Sue-bae-sang(壽杯床). Both countries had a Kan-ban(decorative table, 看盤) and Mi-soo(wine and someatables, 味數) during banquet. The composition of the table may be the same for both Korean Geo-sick-oh-kwa-sang and Japanese 3Jeup(soups) 15Che(dishes). Agasang is a Kan-ban(decorative table) of Choson's Da-do(茶道) style.

After the Japanese Invasion of Korea in 1592, correspondents of Chosun called on Japan twelve times, as a mission, from 1607 to 1811. The suite of Chosun Communication Facilities (correspondents) was composed of nearly 500 people including a senior envoy, a junior envoy, other envoyes, and cooks. After preparing traveling expenses, Sifts, foods, medicinal stuffs, and ginseng, they shipped people and freight in three passenger ships and three freighters. They departed from Pusan for Edo(Tokyo). There were 28 stop-overs on their way to Edo and the banquet was given for them at every stop. The arrangements of the table for each banquet were made up of 753 Seon(tables), 3Jeup(soups) and 15Che(dishes). 753Seon(tables) is Ganban(the table for decoration) and a substantial food reception was composed of 3Jeup(soups) and 15Che(dishes). 753Seon(tables) was called Dadopoong(the food of refreshment) style and this was the standard arrangement of the banquet table in Japan. It was comprised of 3Jeup(soups) and 15Che(dishes). On their way from Edo to Thusima Island, food was afforded to correspondents for later preparation and dining. The banquet that the master of Thusima Island gave was composed of the first and second style banquets. The first one was Chusun style and the second one was Japanese style.

CuO 및 C얘의 첨가가 BiNbO4 세라믹스의 고주파 유전특성에 미치는 영향을 조사하였다. CdO 첨가량이 증가함에 따라 소결밀도 및 품질계수는 감소하였고 소결온도가 증가하면 유전상수 및 품질계수는 증가하였다. BiNbO4에 CuO 및 CdO를 각각 0.03wt% 첨가한 시편을 960˚C에서 소결시 유전율 41.2, 품질계수(Q×f0) 6,500(at 5.6GHz), 공진주파수 온도계수 3ppm˚C의 우수한 고주파 유전특성을 얻을 수 있었다.