형태적(形態的)으로 다른 두 옥수수 (Zea mays L.)의 혼작(混作)이 청예(靑刈)및 종실수량(種實收量)에 미치는 영향(影響)

최봉호,최창열,박종성,이희봉,Choe, Bong Ho,Choi, Chang Yeol,Park, Jong Seong,Lee, Hee Bong 충남대학교 농업과학연구소 1988 Korean Journal of Agricultural Science Vol.15 No.2

형태적(形態的)으로 상이(相異)한 다종다얼성(多種多蘖性)인 특성(特性)인 형매교배(兄妹交配)된 IK 교잡종(交雜種)과 무얼성(無蘖性)인 진주옥 교잡종(交雜種)을 공시(供試)하여 청예수량(靑刈收量), 종실수량(種實收量) 및 이와 관련(關聯)된 형질(形質)을 비교(比較)하고자 IK와 진주옥의 파종비율(播種比率)을 1 : 1, 1 : 2, 1 : 3, 2 : 1, 3 : 1로 혼파(混播)한 것과 IK와 진주옥을 각각(各各) 단작(單作)하여 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. 1. 공시(供試)된 품종(品種) 모두가 단작(單作)보다 혼작(混作)에서 초장(草長)이 큰 경향(傾向)이었고 진주옥의파종비율(播種比率)을 증가(增價)할수록 IK의 생육(生育)은 저조(低調)한것으로 나타났다. 2. 출현(出現) 후(後) 40 일경(日頃)까지 모든 처리구(處理區)에서 IK의 분얼수(分蘖數)는 증가(增加)하였는데 IK의 파종비율(播種比率)이 많을수록 분얼수(分蘖數)의 증가(增加)가 뚜렷하였다. 3. IK 단작(單作)의 10 a당(當) 청예수량(靑刈收量)은 출사기(出絲期)에서 8,096kg이었고, 호숙기(糊熟期)서는 6,677kg으로 가장 많았는데 이는 진주옥 단작(單作)에 비(比)해 각각(各各) 77%와 53%가 증가(增加)되었고 IK와 진주옥의 1 : 1 처리구(處理區)에서는 진주옥 단작(單作)보다 20%가 증가(增加)되었다. 4. 10 a당(當) 종실수량(種實收量)은 진주옥 단작(單作)에서 434kg이었고 IK 단작(單作)은 373kg이었는데 IK와 진주옥을 1 : 1과 1 : 3으로 혼파(混播)한 구(區)에서 IK단작(單作)의 종실수량(種實收量)보다 16%와 13%가 각각(各各) 증가(增價)되었다. 5. IK 도복(倒伏)은 단작(單作)에서 29.2%로 진주옥의 파종비율(播種比率)이 증가(增價)할수록 IK 도복(倒伏)이 증가경향(增加碩向)이었는데 IK와 진주옥을 1 : 1 혼파(混播)한 구(區)에서 IK의 도복율(倒伏率)이 10.9%로 크게 경감(輕減)되었다. 6. 진주옥의 파종비율(播種比率)이 많을수록 IK의 경직경(莖直俓)이 감소(減少)하였고 착수고(着穗高)는 IK의 파종비율(播種比率)이 많을수록 IK의 착수고(着穗高)가 낮아지는 경향(碩向)이었다. 흑조위축병(黑條萎縮病) 리병율(罹病率)은 두 품종(品穩) 모두 파종비율(播種比率)과는 관련(關係)없이 저항성(抵抗性) 품종(品種)임이 확인(確認)되었다. This study was done to investigate the interplanting effects of corn, when a corn hybrid with tillers (IK derivaties) was interplanted with a corn hybrid without tillers(Jinjoo Ok). The interplanting ratios of two hybrids, IK and Jinjoo Ok, were 1 to 1, 1 to 2, 1 to 3, 2 to 1, and 3 to 1. The interp1anting effects were compared with monoculture for major agronomic characteristics. 1. The plant height was increased when interplanted regardless of the interplanting ratios of the two hybrids. The general growth of IK hybrid was a little hindered when the interplanting ratio of Jinjoo Ok hybrid increased. 2. The number of tillers produced by the IK hybrid increased until 40 days after emergence and appeared to increase as the interplanting ratio of IK hybrid increased. 3. When monocultured, the fresh weight of IK hybrid per 10a was 8,096kg and and 6,677kg at silking and dough stages, respectively and these were 77%, 53% over the fresh weight of Jinjoo Ok at the sarne stages. When IK and Jinjoo Ok hybrids were interplanted in 1 to 1 ratio, the fresh weight of IK was 20% higher than that of Jinjoo Ok monocultured. 4. The highest grain yield per 10a was obtained from the Jinjoo Ok hybrid monocultured and the yield was 434kg. Even the interplanting ratios between IK and Jinjoo Ok were 1 to 1 and 1 to 3, the grain yield of Jinjoo Ok was 16% and 13% over the IK, respectively. 5. Root and stalk lodging of IK hybrid was 29% when monocultured and seemed to increase as the interplanting ratio of Jinjoo Ok increased. The lowest lodging was found when the interplanting ratio of IK and Jinjoo Ok was 1 to 1. 6. Stem diameter of IK hybrid was also decreased as the interplanting ratio of Jinjoo Ok increased. The ear height of IK was lowered as the interplanting ratio of IK was increased. The two hybrids tested seemed to have tolerance to the black streaked dwarf virus(BSDV).

지역별 재배규모별로 본 재래종 옥수수의 특성조사(II)

최봉호,이인섭,Bong-Ho Choe,In-Sup Lee 한국작물학회 1978 Korean journal of crop science Vol.23 No.2

현재 농민들에 의해 전국적으로 재배되고 있는 재래종 옥수수를 가지고 양질 다수성인 옥수수 품종육성을 위한 육종재료로 이용하기에 앞서 전국의 109영군에서 수집된 907재 옥수수 이삭의 입에 대한 형태를 조사하고 또 이들 형태가 재배규모(재배면적과 103당 생산량)와는 어떤 연관성이 있는가를 알기 위해 조사분석하였던 바 그 결과를 요약하면 다음과 같다. 1. 옥수수의 재배규모에 따라 우리나라의 옥수수 재배는 강원도와 기타지역으로 이대 구분되며 강원도의 옥수수 재배면적은 전면적의 평균 27%인데 반하여 기타 지역은 5% 미만에 지나지 않았다. 2. 재배면적률이 높은 지역과 낮은 지역에서의 10a당 생산량, 이삭의 무게, 이삭당 입중, 이삭의 크기 입의 연질성과 비중에 있어서 뚜렷한 차이가 있었다. 즉 옥수수가 많이 재배되는 곳에서의 이들 특성은 옥수수 재배면적률이 낮은 곳에서의 그것들 보다 훨씬 높은 수치를 가졌다. 3. 옥수수가 많이 재배되는 곳에서 조사한 특성들의 수치가 높았다는 것은 농민들의 재배기술이 보다 발달하였다기 보다는 옥수수를 보다 많이 재배함으로서 옥수수의 자식을 막고 가능한 한의 방임수분의 기회를 많이 주었기 때문이라 생각된다. 4. 조사한 특성들의 균일도에 있어서도 최소치와 최대치간에 차이가 컸고 특히 현재 장여되고 있는 황색 마치종에 비하여 균일도 뿐만 아니라 절대치에 있어서도 과반에 미치지 않았다. 5. 다만 입의 연질성에 있어서는 재래종들이 일반적으로 경질성이었는데 반하여 외래종은 연질성이라 할 수 있었다. 6. 입의 비중이 있어서는 재래종과 도입마치종이 비슷하였다. 7. 옥수수입의 크기에 있어서는 강원도지역의 옥수수는 다른 지역에서의 그것보다 평균 이배 가량 켰다. 8. 조사한 특성상호간의 관계를 지역적으로 나누어 본 결과 옥수수 재배면적과 10a당 수량은 옥수수가 많이 재배되는 곳에서는 r=0.85로 높았으나 옥수수의 재배가 그리 많지 않았던 지역에서는 이 두 변이간에 상관계수가 0.5이하였다. 이와 같은 경향은 특성들의 옥수수 재배면적에 대한 상대적 기여도에서도 확인되었다. 9. 10a당 수량과 이삭의 무게에 있어서 옥수수 재배가 많은 곳(강원도)에서는 낮은 상관을 보였으나 재배가 낮은 곳(E지역)에서는 r=0.7로 높았다. 상대적 기여도에 의해서도 동일한 결과를 얻었다. 10. 기타 입의 크기는 다른 모든 특성과 높은 정의 상관을 보였다. 11. 입의 크기가 재배면적이나 10a당 생산량에 미치는 상대적 기여도도 다른 특성에 비해서 훨씬 컸고 지역에 따라 정도에 차이가 있었다. Kernel softness. density. size and 100 kernel weight of Korean local corn lines (Zea mays, 1.) were studied to find any relationship with cultural magnitude in regions. Kernel density. softness and size were greater in the Kangwon area than in other less growing areas. Kernel size was the only character showing great relationship with growing magnitude. Most of the collected lines were flinty type and no differences were found among various growing magnitudes. Kernel density was also the same through the growing magnitudes.

선발지수(選拔指數)에 의(依)한 수도품종(水稻品種)의 선발(選拔)

최봉호,정근식,Choe, Bong-Ho,Chung, Keun-Sik 충남대학교 농업과학연구소 1979 Korean Journal of Agricultural Science Vol.6 No.1

안전(安全) 다수성(多收性)인 수도품종(水稻品種)을 선발(選拔)하기 위하여 10개(個) 품종(品種)을 6개(個)의 상이(相異)한 재배환경하(栽培環境下)에서 3반복(反復)으로 각각(各各) 시험(試驗)한 후 Hazel 방법(方法)(선발지수(選拔指數 I)과 Pesek 등 방법(方法)(선발지수(選拔指數 II)에 의(依)해 지수(指數)를 계산(計算)하여 비교(比較)하였던 결과(結果)는 다음과 같다. 조사(調査)한 특성(特性)은 수량(收量)을 비롯하여 6개였다. 1. 10개(個) 품종(品種)가운데서 재배방법(栽培方法)이 상이(相異)함에도 불구(不拘)하고 품종번호(品種番號) 6, 3, 4, 5가 우수(優秀)한 품종(品種)으로 판별(判別)되었다. 2. 일반조건하(一般條件下)에서의 품종선발(品種選拔)을 위해서는 선발지수(選拔指數) I(Hazal 방법(方法))이 좋을 것이나 특수환경하(特殊環境下)에서는 오히려 Pesek 방법(方法)(선발지수(選拔指數) II)이 유리(有利)할 것으로 보여졌다. 3. 지수상(指數上)으로 본 품종(品種)의 순위(順位)가 특성(特性)들 특(特)히 수량(收量)의 순위(順位)와는 정확(正確)히 일치(一致)하지 않아 더욱 지수법(指數法)의 의미를 새롭게 했다. 4. 재배방법(栽培方法)에 따라 또는 품종(品種)의 특성(特性)에 따라 약간 다르기는 했지만 특성(特性)의 대부분(大部分)이 높은 유전력(遺傳力)(광의(廣意)의)을 보였다. 5. 품종(品種)과 6개의 상이(相異)한 재배환경(栽培環境)사이에는 상호작용(相互作用)이 인정(認定)되지 않았다. 6. 6개(個) 특성(特性)가운데 수수(穗數)만이 품종간(品種間)에 유의차(有意差)가 인정(認定)되지 않았고(재배방법(栽培方法) 2, 4, 5에서) 다른 특성(特性)들은 모두 품종간(品種間)에 고도(高度)의 유의차(有意差)가 인정(認定)되었다. Selection index methods were applied to selecting better performing rice varieties with better plant characters from rice yielding trials tested under six different cultural methods. The results obtained were summarized as follows: 1. Varieties such as NO. 3, 4, 5 and 6 were selected as best performing varieties with good plant and grain characters. 2. Selection index I computed from Hazel's method was appeared effective for selecting rice varieties grown under general optimum environmental conditions, while selection index II computed from Pesek and Baker's desired genetic gain were effective for selecting rice varieties grown under rather stressed conditions. 3. The rank of mean yield of each variety was not completely in agreement with that of index values, which indicates the importance of other characters besides yield in selecting varieties. 4. Most characters studied were high in broad sense of heritabilities. 5. No significant interaction was found between varieties and cultural methods.

새로운 육종자원확보(育種資源確保)를 위(爲)한 재래종(在來種) 옥수수의 연구(硏究)

최봉호,이인섭,박종성,김영래,Choe, Bong Ho,Lee, In Sup,Park, Jong Seong,Kim, Yong Rae 충남대학교 농업과학연구소 1980 Korean Journal of Agricultural Science Vol.7 No.1

1977년(年)에 충남대학교(忠南大學校) 농과대학(農科大學)에서 수집(蒐集)한 재래종(在來種) 옥수수 육종(育種)에 이용(利用)될 수 있는 새로운 육종재료(育種材料)를 유지(維持)하고 또 찾기 위해 충남대학(忠南大學) 포장(圃場)과 농촌진흥청(農村振興聽) 작물시험장(作物試驗場) 포장(圃場)에 파종(播種)하여 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. 편의상(便宜上) 실제(實際)로 옥수수 육종(育種)에 응용(應用)할 수 있는 응용면(應用面)과 장차 기초연구(基礎硏究)를 위해 필요(必要)하다고 생각되는 학술면(學術面) 그리고 재래종(在來種) 전반(全般)에 걸친 유전적(遺傳的) 정보(情報)로 나누어 요약(要約)하고자 한다. A. 응용면(應用面) 1. 근래(近來)에 정부(政府)에서 도입(導入) 장려하고 있는 재래종(在來種)(마치종(馬齒種))에 피해(被害)를 주는 흑조위축병(黑條萎縮病)에 내병성(耐病性)인 계통(系統)이 확인(確認)되었다. 2. 곡실(穀實)의 다수(多收)와 싸이레지용(用)으로 이용(利用)할 수 있다고 보이는 다수성(多穗性) (Prolific type) 옥수수 계통(系統)과 분지성(分枝性) 옥수수 계통(系統)이 확보(確保)되었다. 3. 여러 유형(類型)의 찰옥수수 계통(系統)이 확인(確認)되었다. (현재(現在) 작물시험장(作物試驗場)에서 연구중(硏究中)임). 4. 또 여러 유형(類型)의 폭열종(爆裂種) 옥수수가 확인(確認)되었다. 5. 웅수출현기(雄穗出現期)에 있어서도 많은 변이(變異)를 보여주어 웅수출현(雄穗出現)을 조절(調節)할 수 있는 육종재료(育種材料)가 확보(確保)되었다. 6. 고단백질(高蛋白質) 옥수수를 육종(育種)할 수 있는 육종재료(育種材料)가 확보(確保)되었다. B. 기초학술면(基礎學術面) 1. 새로운 sugary인자(因子)의 표현형(表現型)이 관찰(觀察)되었다. 2. 새로운 opaque인자(因子)의 표현형(表現型)이 관찰(觀察)되었다. 3. 새로운 웅수불임계통(雄穗不稔系統)이 관찰(觀察)되었다. 4. 다수성(多穗性) 계통(系統)이 관찰(觀察)되었다. 5. 다지성(多枝性) 계통(系統)이 관찰(觀察)되었다. 6. 내흑조위축병(耐黑條萎縮病) 계통(系統)이 관찰(觀察)되었다. 7. 폭열종(爆裂種) 계통(系統)이 관찰(觀察)되었다. 8. 웅수출현(雄穗出現)에 있어서 환경(環境)에 예민(銳敏)한 계통(系統)과 둔(鈍)한 계통(系統)이 관찰(觀察)되었다. C. 재래종(在來種)의 유전적(遺傳的) 정보(情報) 간장(稈長), 100립종(粒種)에 대(對)하여 자식열세(自殖劣勢) 잡종강세현상(雜種强勢現像)을 분석(分析)하였던 바. 1. 대부분(大部分)의 수집재래종(蒐集在來種) (강원도(江原道) 등 산간지역(山間地域) 주민(住民) 제외(除外))들이 동형접합체화(同型接合體化) 되어 있음을 알 수 있었다. 2. 간장(稈長)에 대(對)한 자식열세현상(自殖劣勢現像)은 평균(平均) 6%로서 거의 모든 계통(系統)이 자식열세현상(自殖劣勢現像)을 보였으며 아울러 잡종강세현상(雜種强勢現像)도 컸다(평균(平均) 40%). 그리고 이들 자식열세현상(自殖劣勢現像)과 잡종강세현상(雜種强勢現像)을 퍼센트로 표시(表示)할때에 계통(系統)들 간(間)에 큰 차이(差異)가 있었다. 3. 100립종(粒種)에 대(對)한 자식열세현상(自殖劣勢現像)은 평균(平均) 16%로서 간장(稈長)에 있어서와 같이 모든 계통(系統)들이 자식열세현상(自殖劣勢現像)을 보였다. 잡종강세현상(雜種强勢現像)에 있어서는 평균(平均) 43%로서 자식열세현상(自殖劣勢現像)에 비(比)하여 그 크기가 컸다. 100립종(粒種)에 대(對)한 자식계통( A new, improved maize varieties are greatly needed to meet the national demand for the maize, and a new germplasm should be investigated to supply necessary breeding materials for the required maize breeding. The Korean local maize lines, which has never been wholly studied for the purpose of breeding should be enough to supply such breeding materials at least in Korea. The objectives of this study were to maintain useful Korean local lines, to investigate good plant characters and to analyze the Korean local maize lines in the respect of genetic make-up. A total of 820 lines and 200 lines were used for the present study. Lines to maintain were planted at experimental farm of the Crop Experiment Station, Office of Rural Development, Suwon and the lines to study genetic make-up were planted in Dae-jon. The summarized results are as follows : 1. A total of 1200 lines from 820 collections were sibbed for future use. 2. Two hundred collection were sibbed, selfed and testcrossed for genetic study in 1980. 3. Ten lines were surely confirmed as resistant lines to virus disease epidemic in most introduced maize varieties. 4. A dozen Lines were having three to four ears per plant. 5. Five lines were showing three to four tillers per plant. 6. One of the most significant and important finding through the study was to obtain the lines with three to four tillers bearing all together eight to nine ears. The lines of multi-ears and multi-tillers must have great breeding potential for the future use. 7. A great variation was observed in the tasselling days, 100 kernel weight and protein content. 8. From the genetic study of local maize lines for plant height and 100 kernel weight, the following findings were obtained. a. On the average six percent of inbreeding depression expressed in percent decrease over sibbed counterpart were found for the plant height. b. Fourty percent of heterosis expressed in percent increase over sibbed counterpart were observed in the plant height. c. The homogeneity or degree of homozygosity calculated from heterosis minus inbreeding depression was on the average 34 percent for plant height. d. The average inbreeding depression expressed in percent decrease over sibbed counterpart was 15 percent for 100 kernel weight. e. The average heterosis expressed in percent increase over sibbed counterpart was 43 percent for 100 kernel weight. f. The degree of homozygosity calculated from the heterosis minus inbreeding depression was 28 percent for 100 kernel weight.

옥수수의 遺傳學 實習材料로서의 利用 I. 멘델의 遺傳法則 實習材料

BONG HO CHOE(崔鳳鎬),JAE WOOK SIM(沈載昱) 한국육종학회 1980 한국육종학회지 Vol.12 No.1

Laboratory materials for use in the genetic class are required to help students understand genetic principles, especially Mendel’s laws. Very few materials are presently used in the genetic classes in Korea. Therefore, the objectives of this study was to develop new genetic materials by using kernel color and shape of corn for the purpose of class use. The results obtained are summarized as follows: 1. The gene for purple kernel was complete dominance over the gene for white kernel. The F₁ between purple and white corn was all purple demonstrating the Mendel’s law of dominance. 2. The gene for round kernel was complete dominance over the gene for sugary gene. The F₁ between round and wrinkled corn was all round, demonstrating the Mendel’s law of dominance. 3. The segregating ratio in the F₂ or testcross was all agreed with the expected ratio and was enough to show Mendel’s law of segregation. That is, 3 to 1 ratio in F₂ and 1 to 1 ratio in the testcross of monohybrid and 9 : 3 : 3 : 1 in F₂ and 1 : 1 : 1 : 1 ratio in the testcross of dihybrid were obtained, respectively. 4. The color of leaves was also segregated as expected in the ratio of 3 green to 1 albino in F₂, showing Mendel’s segregation ratio. 5. The phenotype and genotype of segregates in F₂ or testcross were all like the parental phenotypes and genotypes, demonstrating the Mendel’s law of purity. 6. The phenotypes and genotypes of segregates from the testcross of dihybrid demonstrated that the genes concerned were all acted independently (law of independence). 7. The materials used in the study were all like the pea which Mendel had used, since the genes used in the study were non-alleles and independently acted. 8. The identification of each phenotype was very easy and the corn was convenient to handle. 9. The materials developed here are assumed to be used also for the lab exercise of Chi-square test. 10. It was certain that the materials used in the study can be produced in large amount and used for genetic classes.

새로운 育種資源確保를 爲한 在來種 옥수수의 研究

崔鳳鎬(Bong Ho Choe),李仁燮(In Sup Lee),朴鍾聲(Jong Seong Park),金暎來(Yong Rae Kim) 충남대학교 농업과학연구소 1980 農業技術硏究報告 Vol.7 No.1

忠南 · 北, 京畿地方에서 蒐集된 在來種 찰 옥수수의 生態型特性

Bong Ho Choe(崔鳳鎬) 한국육종학회 1991 한국육종학회지 Vol.23 No.2

A Korean local glutinous maize collected in a series of Korean local maize studies was found to be an ecotype which has been grown by farmers for some period of time under typical cultivation practices. Even though the ecotype confirmed has no definite varietal name, the maize has a very peculiar plant characteristics like plant height, uniformity, tasselling date, tassels inside flag leaf, kernel color and kernel weight. The plant height is about 160cm in Korea and about 130cm in the Philippines due to the plant response to the short-day length in the Philippines. The ecotype has been maintained by open pollination by farmers in Kyongki and Chungnam-buk provinces. The low variation in plant height and other plant characteristics was observed either on collections from regions or trials between years. Two specific characteristics of the ecotype were low inbreeding depression when selfed, and high heterosis when crossed, suggesting that the ecotype has undergone considerable inbreeding in the farmers field. The delayed tasselling date of the ecotype might be due to long and heavy rainfalls during the June and July in Korea.

Characteristics of Tillering maize inbred IK4

Bong Ho Choe(崔鳳鎬)Hee Bong Lee(李喜鳳),Won Koo Lee(李元九),Hee Chung Ji(池熺正),Chong Tae Chung(鄭鍾台),Seung Keun Jong(鄭丞根) 한국육종학회 1994 한국육종학회지 Vol.26 No.4

IK4 inbred line is one of the few maize inbreds developed by authors based on the number of tillers per plant. The objectives of the study were to characterize the IK4 inbred itself and to determine the characteristics of the line when it was crossed with other tillering inbred lines. The IK4 inbred showed tillers taller than the main stem at maturity. Tillering habits of IK4 were showed also in some of the F₁ hybrids. Tillers taller than main stem at maturity assumed to be very effective for increasing kernel yield as well as silage production of tillering maize hybrids.

옥수수 蛋白質의 質的向上을 爲한 蛋白體 檢鏡

BONG HO CHOE(崔鳳鎬) 한국육종학회 1979 한국육종학회지 Vol.11 No.2

As a means of selecting out normal looking opaque-2 kernels from a segregating generation of modified opaque-2 crosses, protein bodies in endosperm cells and in aleurone layers were microscopically observed. Determination of protein bodies in the endosperm cells of normal maize, which had previously been done by sectioning kernels and dissolving starch granules using amylase, were possible without using amylase. Endosperm cells of opaque-2 maize completely lacked protein bodies were distinctly observable in both endosperm and aleurone layer cells and varied in quontity depending on the position of kernels and the location of aleurone layers. The kernels observed could be used for propagation after observation.

農業硏究를 위한 PC프로그램들의 考察 및 “나의 통계(MYSTAT)” 紹介

Bong Ho Choe(崔鳳鎬),Young Man Lee(李榮萬),Won Sik Han(韓元植) 한국육종학회 1994 한국육종학회지 Vol.26 No.1

Almost all PC programs being used in Korea are originated from other countries and some of these programs are reviewed for their strong and weak points. Programs discussed are in general enough to run any sophisticated statistical problems only if the users have good command in English and in using computer use. However, there are some limitations in using these programs. Such limitations include fully understanding manuals of each program, accessing each program especially when new version is available, high prices, and debugging when problems occurred. Some programs require a lot of memory and hard disk and command a high price tag for the full implementation. In order to elliminate such limitations and to meet demands by beginners, simple and easy to use program, MYSTAT, was developed and discussed for its general features. The program is writtern basically according to the book published by Hyangmoonsa and compiled. A total of 59 programs are inculded in two high density diskets. Users are required to have Korean language DOS in their computer with a proper hardware like KS-C-5601. Users are only to have follow the pop menu writtern in Korean. MYSTAT has also serveral limitations in data manipulation and number of factors and variables to handle. Anyone interested can contact either publisher to obtain diskets in substantial price.